JP2012034559A - Power conversion device and power conversion system - Google Patents

Abstract

A power conversion device and a power conversion system capable of bidirectional power conversion with a simple configuration are provided.
A power conversion device outputs AC power rectified by a rectifying / inverter circuit to a step-up / down circuit and transmits power transmitted by a power transmission insulating circuit to second power supply nodes NP2, NM2. Whether the DC power supplied from the second power supply nodes NP2 and NM2 is output to the step-up / down circuit 53 and the power transmitted by the power transmission insulating circuit 54 is output to the rectifier / inverter circuit 51. Switching circuits 52A and 52B for switching are provided.
[Selection] Figure 1

Description

  The present invention relates to a power conversion device, and more particularly to a power conversion device and a power conversion system that perform bidirectional power conversion.

  2. Description of the Related Art Power converters for charging driving main batteries such as electric vehicles (EV) and plug-in hybrid vehicles (HV) using ordinary household AC power have been developed.

  In the future, in the event of a power outage such as an earthquake disaster, and in places such as campsites where electricity cannot be obtained, it will be required to send power from the automobile side to the house side, so the development of a bidirectional power converter is necessary. It becomes.

  Although not intended to charge such a main battery such as an EV, an example of an insulating circuit for a power supply device that converts AC power into DC power is disclosed in, for example, Japanese Patent No. 3595329 (Patent Document 1). Are listed. That is, the power supply device insulating circuit includes a rectifier circuit that converts an AC voltage into a DC voltage, a first capacitor that reduces a pulsating current component remaining in a DC current supplied from the rectifier circuit, and the first capacitor. A first switch circuit that simultaneously opens and closes a positive side and a negative side of a direct current supplied from a capacitor; a second capacitor that stores current supplied from the first switch circuit; and a second capacitor A second switch circuit that simultaneously opens and closes a positive side and a negative side of the supplied direct current; and a third capacitor that holds the current supplied from the second switch circuit and discharges the current to the load side. Further, the ON time is set shorter than the OFF time while the ON time is set to be complementary to the control signal φ1 configured by the square wave set shorter than the OFF time and the control signal φ1. A gate control circuit for generating the control signal φ2 is provided. The first switch circuit is opened and closed by the control signal φ1, and the second switch circuit is opened and closed by the control signal φ2. With such a configuration, an AC voltage can be converted to a DC voltage without using a power transformer that occupies a large volume, and the AC power supply side and the load side can be electrically insulated.

  Further, as an example of a bidirectional type step-up / down circuit, for example, Japanese Patent Laid-Open No. 2001-268900 (Patent Document 2) discloses the following configuration. That is, a bidirectional buck-boost chopper circuit in which an input end side is connected to a low-voltage battery and an output end side is connected to a DC motor. This bidirectional buck-boost chopper circuit includes a plurality of switching circuits in which switching elements and diodes are connected in parallel, and a cascode circuit in which two switching circuits are connected. When the DC motor is driven, the voltage of the battery is increased or decreased to drive the DC motor, and when the DC motor is regenerated, the back electromotive force of the DC motor is increased or decreased to charge the battery.

Japanese Patent No. 3595329 JP 2001-268900 A

  In the bidirectional power converter, in order to transmit power bidirectionally between the automobile side and the house side, it is necessary to adjust and output the level of the input voltage in the power converter.

  However, the power supply device isolation circuit described in Patent Document 1 cannot adjust the level of the input voltage in the power conversion device.

  In addition, when the insulating circuit for a power supply device described in Patent Document 1 is changed to a bidirectional power converter, the step-up / step-down circuit is bidirectionalized as in the configuration described in Patent Document 2, for example, and the insulating circuit Since it is necessary to increase the number of switches in order to make it bidirectional, the circuit configuration becomes complicated.

  This invention was made in order to solve the above-mentioned subject, and the objective is to provide the power converter device and power conversion system which can perform bidirectional | two-way power conversion with a simple structure.

  (1) In order to solve the above-described problem, in a power converter according to an aspect of the present invention, an inverter circuit for converting received DC power into AC power and supplying it to the first power supply node is provided inside or outside. A first power conversion operation provided to convert the AC power supplied from the first power supply node into DC power and supply the DC power to the second power supply node; and the DC power supplied from the second power supply node to the inverter circuit A power conversion device for performing a second power conversion operation to output to a rectifier circuit for rectifying AC power supplied from the first power supply node, and boosting or stepping down the received power for output A rectifier circuit rectified by the rectifier circuit, a power transmission insulating circuit for transmitting power received from the step-up / down circuit while insulating between the input side and the output side The flowing power is output to the step-up / down circuit, and the power transmitted by the power transmission insulating circuit is output to the second power supply node, or the DC power supplied from the second power supply node is used for the power transmission. A switching circuit for switching whether to output to the inverter circuit via an insulating circuit.

  With such a configuration, a bidirectional power conversion device can be realized without making the step-up / step-down circuit and the power transmission insulating circuit bidirectional. Therefore, bidirectional power conversion can be performed with a simple configuration.

  (2) Preferably, the power conversion device further rectifies the AC power supplied from the first power supply node as the rectifier circuit and the inverter circuit, and converts the received DC power into AC power. And the switching circuit outputs the AC power rectified by the rectification / inverter circuit to the step-up / step-down circuit, and the switching circuit includes the rectification / inverter circuit capable of supplying the first power supply node. The power transmitted by the power transmission insulating circuit is output to the second power supply node, or the DC power supplied from the second power supply node is output to the step-up / step-down circuit and transmitted by the power transmission insulating circuit. Whether to output the generated power to the rectifier / inverter circuit is switched.

  With such a configuration, it is not necessary to separately provide an inverter circuit outside the power converter.

  (3) More preferably, the switching circuit electrically connects the rectification / inverter circuit and the input side of the step-up / down circuit, and outputs the power transmission insulating circuit and the second power supply node. Or the second power supply node and the input side of the step-up / down circuit are electrically connected, and the output side of the power transmission insulating circuit and the rectifier / inverter circuit are electrically connected. Switch the connection.

  In this way, by changing the circuit connection by the switching circuit, it is possible to realize a bidirectional power converter without making the step-up / step-down circuit and the power transmission insulating circuit bidirectional.

  (4) More preferably, the switching circuit includes a first switch having a first terminal electrically connected to the rectification / inverter circuit, a second terminal, and a third terminal, and the first switch A second switch having a first terminal electrically connected to a second terminal of the switch; a second terminal electrically connected to an input side of the step-up / down circuit; and a third terminal; A third switch having a first terminal electrically connected to the output side of the transmission insulating circuit, a second terminal, and a third terminal electrically connected to the third terminal of the first switch A first terminal electrically connected to the second terminal of the third switch, a second terminal electrically connected to the second power supply node, and a third terminal of the second switch. And a fourth switch having a third terminal electrically connected.

  In this way, by changing the circuit connection by switching each switch in the switching circuit, it is possible to realize a bidirectional power conversion device without making the step-up / down circuit and the power transmission insulating circuit bidirectional. It becomes.

  (5) More preferably, in the first power conversion operation, the first terminal and the second terminal of each of the first switch to the fourth switch are connected, and in the second power conversion operation, the first power conversion operation is performed. A first terminal and a third terminal of each of the first switch and the third switch are connected, and a second terminal and a third terminal of each of the second switch and the fourth switch are connected.

  By such switch control, a bidirectional power converter can be realized without making the step-up / step-down circuit and the power transmission insulating circuit bidirectional.

  (6) Preferably, the inverter circuit is provided outside the power converter, and the switching circuit outputs the AC power rectified by the rectifier circuit to the step-up / down circuit, and the power transmission insulation. The power transmitted by the circuit is output to the second power supply node, or the DC power supplied from the second power supply node is output to the step-up / down circuit, and the power transmitted by the power transmission insulating circuit is output. The output is switched to the inverter circuit.

  With such a configuration, it is not necessary to provide an inverter circuit for converting DC power into AC power in the power conversion device, and it is sufficient to provide a rectifier circuit. Therefore, the configuration of the power conversion device can be simplified. .

  (7) More preferably, the switching circuit electrically connects the rectifier circuit and the input side of the step-up / down circuit, and electrically connects the output side of the power transmission insulating circuit and the second power supply node. Or whether the second power supply node and the input side of the step-up / down circuit are electrically connected, and the output side of the power transmission insulating circuit and the inverter circuit are electrically connected. Switch.

  In this way, by changing the circuit connection by the switching circuit, it is possible to realize a bidirectional power converter without making the step-up / step-down circuit and the power transmission insulating circuit bidirectional.

  (8) More preferably, the switching circuit includes a first terminal electrically connected to the rectifier circuit, a second terminal electrically connected to an input side of the step-up / down circuit, and a third terminal. A first switch electrically connected to an output side of the power transmission insulating circuit, a second terminal, and a third terminal electrically connected to the inverter circuit. A second switch; a first terminal electrically connected to a second terminal of the second switch; a second terminal electrically connected to the second power supply node; and a first terminal of the first switch. And a third switch having a third terminal electrically connected to the third terminal.

  In this way, by changing the circuit connection by switching each switch in the switching circuit, it is possible to realize a bidirectional power conversion device without making the step-up / down circuit and the power transmission insulating circuit bidirectional. It becomes.

  (9) More preferably, in the first power conversion operation, the first terminal and the second terminal of each of the first switch to the third switch are connected, and in the second power conversion operation, the first power conversion operation is performed. The first terminal and the third terminal of each of the first switch and the third switch are connected, and the first terminal and the third terminal of the second switch are connected.

  By such switch control, a bidirectional power converter can be realized without making the step-up / step-down circuit and the power transmission insulating circuit bidirectional.

  (10) A power converter according to another aspect of the present invention further includes an inverter circuit for boosting received DC power, converting the received DC power into AC power, and supplying the same to the first power supply node. A first power conversion operation for converting AC power supplied from one power supply node into DC power and supplying it to a second power supply node; and a second power for outputting DC power supplied from the second power supply node to the inverter circuit. A power conversion device for performing a power conversion operation, comprising: a rectifier circuit for rectifying and outputting AC power supplied from the first power supply node; and boosting or stepping down the power received from the rectifier circuit. A step-up / step-down circuit for outputting, a power transmission insulating circuit for transmitting received power while insulating between the input side and the output side, and step-up / step-down by the step-up / down circuit The power transmitted to the power transmission isolation circuit and the power transmitted by the power transmission isolation circuit to the second power supply node, or the DC power supplied from the second power supply node to the power And a switching circuit for switching whether to output the power transmitted to the transmission insulating circuit and the power transmitted by the power transmission insulating circuit to the inverter circuit.

  With such a configuration, a bidirectional power conversion device can be realized without making the step-up / step-down circuit and the power transmission insulating circuit bidirectional. Therefore, bidirectional power conversion can be performed with a simple configuration.

  (11) Preferably, the switching circuit electrically connects the output side of the step-up / down circuit and the input side of the power transmission insulating circuit, and the output side of the power transmission insulating circuit and the second side. A power supply node is electrically connected, or the second power supply node is electrically connected to the input side of the power transmission insulation circuit, and the output side of the power transmission insulation circuit is connected to the inverter circuit. Switch between electrical connection.

  In this way, by changing the circuit connection by the switching circuit, it is possible to realize a bidirectional power converter without making the step-up / step-down circuit and the power transmission insulating circuit bidirectional.

  (12) More preferably, the switching circuit includes a first terminal electrically connected to the output side of the step-up / step-down circuit and a second terminal electrically connected to the input side of the power transmission insulating circuit. And a first switch having a third terminal, a first terminal electrically connected to the output side of the power transmission insulating circuit, a second terminal, and the inverter circuit being electrically connected A second switch having a third terminal; a first terminal electrically connected to the second terminal of the second switch; a second terminal electrically connected to the second power supply node; A third switch having a third terminal electrically connected to the third terminal of the first switch.

  In this way, by changing the circuit connection by switching each switch in the switching circuit, it is possible to realize a bidirectional power conversion device without making the step-up / down circuit and the power transmission insulating circuit bidirectional. It becomes.

  (13) More preferably, in the first power conversion operation, the first terminal and the second terminal of each of the first switch to the third switch are connected, and in the second power conversion operation, the first power conversion operation is performed. The first terminal and the third terminal of each of the first switch and the third switch are connected, and the first terminal and the third terminal of the second switch are connected.

  In this way, by changing the circuit connection by switching each switch in the switching circuit, it is possible to realize a bidirectional power conversion device without making the step-up / down circuit and the power transmission insulating circuit bidirectional. It becomes.

  (14) Preferably, the insulating circuit for power transmission includes a first power storage element having a first end and a second end, a second power storage element having a first end and a second end, a first end and A third power storage element having a second end; a first switch element connected between the first end of the first power storage element and the first end of the second power storage element; and A second switch element connected between a second end of the power storage element and a second end of the second power storage element, wherein the first end of the first switch element and the second switch element Connected between an input switch unit for supplying electric power received at the first end to the second power storage element, and a first end of the second power storage element and a first end of the third power storage element Between the second switch element and the second end of the second power storage element and the second end of the third power storage element Includes a fourth switching element connected, the power stored in said second storage element and an output switch for supplying to said third storage element.

  With such a configuration, an AC voltage can be converted to a DC voltage without using a power transformer that occupies a large volume, and the first power supply node and the second power supply node can be electrically insulated.

  (15) In the power converter according to another aspect of the present invention, an inverter circuit for converting received DC power into AC power and supplying it to the first power supply node is provided inside or outside, and the first converter A first power conversion operation for converting AC power supplied from a power supply node into DC power and supplying it to a second power supply node, and second power for outputting DC power supplied from the second power supply node to the inverter circuit A power conversion device for performing a conversion operation, wherein the rectifier circuit rectifies AC power supplied from the first power supply node, and is electrically connected to the rectifier circuit to boost or step down received power. And a first node electrically connected to the step-up / step-down circuit, and a second node electrically connected to the second power supply node, the first node and An insulating circuit for power transmission for transmitting power between the first node and the second node while insulating between the second nodes, the step-up / down circuit, and a first node of the insulating circuit for power transmission A first switching circuit for switching the polarity of the electrical connection between the first power supply node, a second node of the power transmission insulating circuit, and a second switch for switching the polarity of the electrical connection between the second power supply node. 2 switching circuits.

  With such a configuration, a bidirectional power conversion device can be realized without bidirectionalizing the power transmission insulating circuit. Therefore, bidirectional power conversion can be performed with a simple configuration.

  (16) Preferably, the power converter further functions as the rectifier circuit and the inverter circuit to rectify AC power supplied from the first power supply node, and to convert the received DC power into AC power. And a rectification / inverter circuit capable of supplying the first power supply node.

  With such a configuration, it is not necessary to separately provide an inverter circuit outside the power converter.

  (17) More preferably, the step-up / down circuit has a first node electrically connected to the rectifier / inverter circuit and a second node electrically connected to the first switching circuit, An operation of boosting or stepping down the power received at the first node and outputting it from the second node and an operation of boosting or stepping down the power received at the second node and outputting from the first node are possible. It is.

  Thus, by using a bidirectional step-up / down circuit, the configuration of the first switching circuit and the second switching circuit can be simplified.

  (18) More preferably, the second node of the step-up / down circuit includes a positive node and a negative node, and each of the first node and the second node of the power transmission insulating circuit is a positive node and a negative node. The second power supply node includes a positive side node and a negative side node, and the first switching circuit includes a first terminal connected to a positive side node of the second node of the step-up / down circuit, and A first terminal having a second terminal connected to the positive side node of the first node of the power transmission insulating circuit and a third terminal connected to a negative side node of the first node of the power transmission insulating circuit. A first terminal connected to the negative side node of the second node of the step-up / down circuit, a second terminal connected to the negative side node of the first node of the insulating circuit for power transmission, The power transmission isolation circuit; A second switch having a third terminal connected to the positive node of the node, wherein the second switching circuit is connected to the positive node of the second node of the power transmission insulating circuit A third switch having a first terminal, a second terminal connected to a positive node of the second power supply node, and a third terminal connected to a negative node of the second power supply node; A first terminal connected to the negative node of the second node of the second isolation node; a second terminal connected to the negative node of the second power supply node; and a positive node of the second power supply node. And a fourth switch having a third terminal connected thereto.

  With such a configuration, the number of switches in the first switching circuit and the second switching circuit can be reduced. In addition, since wiring between the first switching circuit and the second switching circuit is unnecessary, it is possible to prevent the wiring from becoming complicated. Moreover, in a power converter device, for example, a harness is used as wiring in order to transmit a certain amount of power, but the length of such a harness can be shortened.

  (19) More preferably, in the first power conversion operation and the second power conversion operation, the first terminal and the second terminal of each of the first switch to the fourth switch are connected, The state where the first terminal and the third terminal of each of the first switch to the fourth switch are connected is switched.

  Such switch control makes it possible to realize a bidirectional power converter without making the power transmission insulating circuit bidirectional.

  (20) Preferably, the inverter circuit is provided outside the power converter, and the power converter further outputs the power boosted or stepped down by the step-up / down circuit to the first switching circuit. Or a third switching circuit for switching whether to output the DC power transmitted from the power transmission insulating circuit via the first switching circuit to the inverter circuit.

  With such a configuration, it is not necessary to provide an inverter circuit for converting DC power into AC power in the power conversion device, and it is sufficient to provide a rectifier circuit. Therefore, the configuration of the power conversion device can be simplified. .

  (21) More preferably, the second node of the step-up / step-down circuit includes a positive node and a negative node, and each of the first node and the second node of the power transmission insulating circuit is a positive node and a negative node. The second power supply node includes a positive node and a negative node; the inverter circuit includes a positive node and a negative node; the first switching circuit includes a first terminal; A first switch having a second terminal connected to the positive node of the first node of the insulation circuit and a third terminal connected to the negative node of the first node of the insulation circuit for power transmission; A first terminal, a second terminal connected to the negative node of the first node of the power transmission insulating circuit, and a second terminal connected to the positive node of the first node of the power transmission insulating circuit. Second having three terminals The second switching circuit is connected to a first terminal connected to a positive node of the second node of the power transmission insulating circuit and to a positive node of the second power supply node. A third switch having a second terminal and a third terminal connected to the negative node of the second power supply node; and a second switch connected to the negative node of the second node of the power transmission insulating circuit. A fourth switch having one terminal, a second terminal connected to the negative node of the second power supply node, and a third terminal connected to the positive node of the second power supply node, The third switching circuit includes a first terminal connected to a positive node of the second node of the step-up / step-down circuit, a second terminal connected to the first terminal of the first switch, and the inverter circuit And a third terminal connected to the negative node of A fifth switch, a first terminal connected to the negative node of the second node of the step-up / down circuit, a second terminal connected to the first terminal of the second switch, and the inverter circuit And a sixth switch having a third terminal connected to the positive side node.

  In this way, by changing the circuit connection by switching each switch in the switching circuit, it is possible to realize a bidirectional power conversion device without making the step-up / down circuit and the power transmission insulating circuit bidirectional. It becomes.

  (22) More preferably, in the first power conversion operation and the second power conversion operation, a state in which the first terminal and the second terminal of each of the first switch to the sixth switch are connected; A state in which the first terminal and the third terminal of each of the first switch to the fourth switch are connected, and the second terminal and the third terminal of the fifth switch and the sixth switch are connected. And can be switched.

  By such switch control, a bidirectional power converter can be realized without making the step-up / step-down circuit and the power transmission insulating circuit bidirectional.

  (23) More preferably, the power converter further includes an AC external terminal for receiving AC power supplied from the first power supply node, and a DC external terminal for outputting DC power to the inverter circuit. Is provided.

  Thus, in addition to the terminal for 1st power supply nodes, the structure provided with the terminal for inverter circuits can ensure the supply path | route of DC power from a power converter device to an inverter circuit.

  (24) Preferably, the power transmission insulating circuit includes a first power storage element having a first end and a second end as the first node, and a second power storage element having a first end and a second end. And a third power storage element having a first end and a second end as the second node, and a connection between the first end of the first power storage element and the first end of the second power storage element A first switching element and a second switching element connected between a second end of the first power storage element and a second end of the second power storage element, the first node and Connected between a first power transfer switch unit for transmitting power between the second power storage elements, and a first end of the second power storage element and a first end of the third power storage element Connected between the second end of the third switch element and the second power storage element and the second end of the third power storage element. Includes a fourth switching element, and a second power transmission switching unit for transmitting power between said second power storage device and the second node.

  With such a configuration, an AC voltage can be converted to a DC voltage without using a power transformer that occupies a large volume, and the first power supply node and the second power supply node can be electrically insulated.

  (25) In order to solve the above problem, a power conversion system according to an aspect of the present invention includes a first power conversion device for converting received DC power into AC power and supplying the AC power to a first power supply node. A first power conversion operation for converting the AC power supplied from the first power supply node into DC power and supplying the DC power to the second power supply node; and the DC power supplied from the second power supply node as the first power. A second power conversion device for performing a second power conversion operation to be output to the conversion device, wherein the second power conversion device rectifies AC power supplied from the first power supply node. A circuit, a step-up / step-down circuit for boosting or stepping down the received power, and an output transmission insulating circuit for transmitting the power received from the step-up / down circuit while insulating between the input side and the output side And the above rectification AC power rectified by a path is output to the step-up / down circuit, and power transmitted by the power transmission insulating circuit is output to the second power supply node, or DC power supplied from the second power supply node. And a first switching circuit for switching whether to output the power transmitted by the power transmission insulating circuit to the first power converter.

  With such a configuration, it is not necessary to provide an inverter circuit for converting DC power into AC power in the power conversion device, and it is sufficient to provide a rectifier circuit. Therefore, the configuration of the power conversion device can be simplified. .

  (26) A power conversion system according to another aspect of the present invention includes a first power conversion device for converting received DC power into AC power and supplying it to a first power supply node, and the first power supply node. A first power conversion operation for converting the AC power supplied from DC to DC power and supplying it to the second power supply node, and a DC power supplied from the second power supply node to the first power converter. A second power conversion device for performing two power conversion operations, wherein the second power conversion device rectifies and outputs AC power supplied from the first power supply node; A step-up / step-down circuit for boosting or stepping down and outputting the power received from the rectifier circuit, a power transmission insulating circuit for transmitting the received power while insulating between the input side and the output side, and the step-up / down circuit Ascending by pressure circuit Alternatively, the step-down power is output to the power transmission insulating circuit, and the power transmitted by the power transmission insulating circuit is output to the second power supply node, or the DC power supplied from the second power supply node. And a first switching circuit for switching whether to output the power transmitted by the power transmission insulating circuit to the first power converter.

  With such a configuration, it is not necessary to provide an inverter circuit for converting DC power into AC power in the power conversion device, and it is sufficient to provide a rectifier circuit. Therefore, the configuration of the power conversion device can be simplified. .

  (27) Preferably, the power conversion system further outputs a direct-current power generated by the power generation device and the direct-current power generated by the power generation device to the first power conversion device, or the second power conversion system. And a second switching circuit for switching whether to output the DC power received from the power converter to the first power converter.

  With such a configuration, an inverter circuit for a power generator can be used as an inverter circuit for converting DC power output from the second power converter into AC power. Can be built.

  (28) More preferably, a storage battery is connected to the second power supply node, and the first power conversion device is in the state where the second power conversion device performs the second power conversion operation. The amount of electricity stored in the storage battery is monitored, and when the amount of electricity stored is less than or equal to a predetermined value, the second power of the second power conversion device is controlled by controlling the first switching circuit in the second power conversion device. The conversion operation is stopped, and further, the second switching circuit is controlled to output the DC power generated by the power generation device to the first power conversion device.

  With such a configuration, the charge amount of the storage battery can be automatically monitored, and the power supply source to the first power supply node can be appropriately switched.

  (29) Preferably, the first power conversion device monitors the presence / absence of an electrical connection with the second power conversion device, and detects the electrical connection, so that the second power conversion device The first power conversion operation of the second power converter is started by controlling the first switching circuit.

  With such a configuration, it is possible to automatically recognize that the second power conversion device is connected to the first power conversion device, and appropriately start power supply to the first power supply node.

  (30) A power conversion system according to another aspect of the present invention includes a first power conversion device for converting received DC power into AC power and supplying it to a first power supply node, and the first power supply node. A first power conversion operation for converting the AC power supplied from DC to DC power and supplying it to the second power supply node, and a DC power supplied from the second power supply node to the first power converter. A second power conversion device for performing two power conversion operations, wherein the second power conversion device rectifies AC power supplied from the first power supply node, and the rectifier circuit. And a step-up / step-down circuit for boosting or stepping down received power, a first node electrically connected to the step-up / step-down circuit, and a second power supply node. Has a second node, A power transmission insulating circuit for transmitting power between the first node and the second node while insulating between the first node and the second node, the step-up / down circuit, and the power transmission insulating circuit The polarity of the electrical connection between the first switching circuit for switching the polarity of the electrical connection between the first node and the second node of the power transmission insulating circuit and the second power supply node And the power boosted or stepped down by the step-up / step-down circuit is output to the first switching circuit or transmitted from the power transmission insulating circuit via the first switching circuit. And a third switching circuit for switching whether to output the direct-current power to the first power converter.

  With such a configuration, it is not necessary to provide an inverter circuit for converting DC power into AC power in the power conversion device, and it is sufficient to provide a rectifier circuit. Therefore, the configuration of the power conversion device can be simplified. .

  (31) Preferably, the power conversion system further outputs a direct-current power generated by the power generation device for generating direct-current power to the first power conversion device or the second power generation device. And a fourth switching circuit for switching whether to output the DC power received from the power converter to the first power converter.

  With such a configuration, an inverter circuit for a power generator can be used as an inverter circuit for converting DC power output from the power converter into AC power, so that a power conversion system can be constructed at low cost. Can do.

  (32) More preferably, a storage battery is connected to the second power supply node, and the first power conversion device is in the state where the second power conversion device performs the second power conversion operation. The amount of electricity stored in the storage battery is monitored, and when the amount of electricity stored is less than or equal to a predetermined value, the second power is controlled by controlling the first switching circuit to the third switching circuit in the second power conversion device. The second power conversion operation of the converter is stopped, and further, the fourth switching circuit is controlled to output the DC power generated by the power generator to the first power converter.

  With such a configuration, the charge amount of the storage battery can be automatically monitored, and the power supply source to the first power supply node can be appropriately switched.

  (33) Preferably, the first power conversion device monitors the presence or absence of an electrical connection with the second power conversion device, and detects the electrical connection, the above-described second power conversion device The first power conversion operation of the second power converter is started by controlling the first switching circuit or the third switching circuit.

  With such a configuration, it is possible to automatically recognize that the second power conversion device is connected to the first power conversion device, and appropriately start power supply to the first power supply node.

  According to the present invention, bidirectional power conversion can be performed with a simple configuration.

It is a figure which shows the structure of the power converter device which concerns on the 1st Embodiment of this invention. It is a figure which shows the switching operation | movement by the insulation circuit for electric power transmission which concerns on the 1st Embodiment of this invention. It is a figure which shows the operation | movement in which the power converter device which concerns on the 1st Embodiment of this invention supplies electric power from the infrastructure (house) side to the motor vehicle side. It is a figure which shows the operation | movement which the electric power converter which concerns on the 1st Embodiment of this invention supplies electric power from the motor vehicle side to the infrastructure (house) side. It is a figure which shows the structure of the power converter device which concerns on the 2nd Embodiment of this invention. It is a figure which shows the operation | movement in which the power converter device which concerns on the 2nd Embodiment of this invention supplies electric power from the infrastructure (house) side to the motor vehicle side. It is a figure which shows the operation | movement in which the power converter device which concerns on the 2nd Embodiment of this invention supplies electric power from the motor vehicle side to the infrastructure (house) side. It is a figure which shows the switching operation | movement by the insulation circuit for electric power transmission which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structure of the power conversion system which concerns on the 3rd Embodiment of this invention. It is a figure which shows the operation | movement in which the power converter device which concerns on the 3rd Embodiment of this invention supplies electric power from the infrastructure (house) side to the motor vehicle side. It is a figure which shows the operation | movement in which the power converter device which concerns on the 3rd Embodiment of this invention supplies electric power from the motor vehicle side to the infrastructure (house) side. It is a figure which shows the structure of the power conversion system which concerns on the 4th Embodiment of this invention. It is a figure which shows the operation | movement in which the power converter device which concerns on the 4th Embodiment of this invention supplies electric power from the infrastructure (house) side to the motor vehicle side. It is a figure which shows the operation | movement in which the power converter device which concerns on the 4th Embodiment of this invention supplies electric power from the motor vehicle side to the infrastructure (house) side. It is a figure which shows the structure of the power conversion system which concerns on the 5th Embodiment of this invention. It is a figure which shows the operation | movement in which the power converter device which concerns on the 5th Embodiment of this invention supplies electric power from the infrastructure (house) side to the motor vehicle side. It is a figure which shows the operation | movement in which the power converter device which concerns on the 5th Embodiment of this invention supplies electric power from the motor vehicle side to the infrastructure (house) side.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Configuration and basic operation]
FIG. 1 is a diagram showing a configuration of a power conversion device according to the first embodiment of the present invention.

  Referring to FIG. 1, power conversion device 101 includes a rectification / inverter circuit 51, switching circuits 52 </ b> A and 52 </ b> B, a step-up / down circuit 53, a power transmission insulating circuit 54, and a control unit 14.

  Rectification / inverter circuit 51 includes transistors TR1 to TR4 and diodes D1 to D4. Switching circuit 52A includes switches SWP1 and SWP2 and switches SWM1 and SWM2. Switching circuit 52B includes switches SWP3 and SWP4 and switches SWM3 and SWM4. The step-up / step-down circuit 53 includes capacitors C11 and C12, an inductor L11, a transistor TR11, and a diode D15. The power transmission insulating circuit 54 includes capacitors C0 to C2, diodes D9 to D12, an input switch unit 21, and an output switch unit 22. The input switch unit 21 includes transistors TR21 and TR22 as switching elements and diodes D5 and D6. The output switch unit 22 includes transistors TR23 and TR24 as switching elements and diodes D7 and D8. Each transistor in the power conversion device 101 is, for example, an IGBT (Insulated Gate Bipolar Transistor). In the power converter according to the first embodiment of the present invention, the “inductor” includes a large component such as a reactor.

  In rectification / inverter circuit 51, transistor TR1 has a gate for receiving a control signal from control unit 14, a collector connected to the cathode of diode D1, and an emitter connected to the anode of diode D1 and power supply node NP1. . Transistor TR2 has a gate for receiving a control signal from control unit 14, a collector connected to the cathode of diode D2 and power supply node NP1, and an emitter connected to the anode of diode D2. Transistor TR3 has a gate for receiving a control signal from control unit 14, a collector connected to the cathode of diode D3, and an emitter connected to the anode of diode D3 and power supply node NM1. Transistor TR4 has a gate that receives a control signal from control unit 14, a collector connected to the cathode of diode D4 and power supply node NM1, and an emitter connected to the anode of diode D4.

  In the switching circuit 52A, the switch SWP1 has a terminal T1, a terminal T2, and a terminal T3 connected to the collectors of the transistors TR1 and TR3 of the rectification / inverter circuit 51. The switch SWM1 has a terminal T21 connected to the emitters of the transistors TR2 and TR4 of the rectifier / inverter circuit 51, a terminal T22, and a terminal T23. The switch SWP2 has a terminal T4 connected to the terminal T2 of the switch SWP1, a terminal T5 electrically connected to the input side of the step-up / down circuit 53, and a terminal T6. The switch SWM2 has a terminal T24 connected to the terminal T22 of the switch SWM1, a terminal T25 electrically connected to the input side of the step-up / down circuit 53, and a terminal T26.

  In the step-up / step-down circuit 53, the transistor TR11 includes a gate that receives a control signal from the control unit 14, a collector connected to the terminal T5 of the switch SWP2 and the first end of the capacitor C11, the cathode of the diode D15, and the first of the inductor L11. And an emitter connected to one end. The anode of the diode D15 and the first end of the capacitor C12 are connected. A second end of the capacitor C11, a second end of the inductor L11, a second end of the capacitor C12, and a terminal T25 of the switch SWM2 are connected.

  In the power transmission insulating circuit 54, the capacitor C0 includes a first end connected to the anode of the diode D9 and the second end of the capacitor C12 of the step-up / down circuit 53, a cathode of the diode D10, and a capacitor C12 of the step-up / down circuit 53. And a second end connected to the first end. Transistor TR21 is connected to the gate for receiving the control signal from control unit 14, the collector connected to the cathode of diode D5 and the anode of diode D9, the anode of diode D5, the first terminal of capacitor C1, and the anode of diode D11. Emitter. Transistor TR22 is connected to the gate for receiving a control signal from control unit 14, the cathode of diode D6, the cathode of diode D12 and the collector connected to the second end of capacitor C1, the anode of diode D6 and the anode of diode D10. Emitter. Transistor TR23 has a gate for receiving a control signal from control unit 14, a collector connected to the cathode of diode D7 and the cathode of diode D11, and an emitter connected to the anode of diode D7 and the first end of capacitor C2. Have. Transistor TR24 has a gate for receiving a control signal from control unit 14, a collector connected to the cathode of diode D8 and the second end of capacitor C2, and an emitter connected to the anode of diode D8 and the anode of diode D12. Have.

  In the switching circuit 52B, the switch SWP3 is electrically connected to the output side of the power transmission insulating circuit 54, that is, the terminal T7 connected to the emitter of the transistor TR23 of the power transmission insulating circuit 54, the terminal T8, And a terminal T9 connected to the terminal T3 of the switch SWP1. The switch SWM3 is electrically connected to the output side of the power transmission insulating circuit 54, that is, the terminal T27 connected to the collector of the transistor TR24 of the power transmission insulating circuit 54, the terminal T28, and the terminal T23 of the switch SWM1. And a terminal T29 connected to the. The switch SWP4 has a terminal T10 connected to the terminal T8 of the switch SWP3, a terminal T11 connected to the positive power supply node NP2, and a terminal T12 connected to the terminal T6 of the switch SWP2. Switch SWM4 has terminal T30 connected to terminal T28 of switch SWM3, T31 connected to power supply node NM2, and terminal T32 connected to terminal T26 of switch SWM2.

  The power conversion device 101 converts AC power supplied from the AC power source 201 into DC power and supplies the DC power to the load 202. Further, the power conversion device 101 converts the DC power supplied from the load 202 into AC power and supplies the AC power to the AC power source 201. That is, the power conversion device 101 converts the AC power supplied from the power supply nodes NP1 and NM1 into DC power and supplies it to the power supply nodes NP2 and NM2, and the power conversion device 101 supplied from the power supply nodes NP2 and NM2. A second power conversion operation is performed in which DC power is converted to AC power and supplied to power supply nodes NP1 and NM1. Here, the load 202 is a main battery for driving such as EV and plug-in HV, for example.

  The rectifying / inverter circuit 51 can perform an operation of rectifying the AC power supplied from the power supply nodes NP1 and NM1, and an operation of converting the received DC power into AC power and supplying the AC power to the power supply nodes NP1 and NM1. is there.

  More specifically, rectification / inverter circuit 51 includes a diode bridge composed of diodes D1 to D4 and transistors TR1 to TR4 connected in parallel to diodes D1 to D4, respectively.

  The control unit 14 outputs the control signal to the transistors TR1 to TR4, thereby turning off the transistors TR1 to TR4. As a result, the rectification / inverter circuit 51 performs full-wave rectification on the AC power received from the AC power supply 201 and outputs it to the switching circuit 52A.

  In addition, the control unit 14 controls the transistors TR1 to TR4 by, for example, PWM (Pulse Width Modulation) by outputting a control signal to the transistors TR1 to TR4. Thus, rectification / inverter circuit 51 converts the DC power received from switching circuit 52A into AC power, and outputs the AC power to AC power supply 201 via power supply nodes NP1 and NM1.

  In the step-up / down circuit 53, the transistor TR11 is electrically connected to the capacitor C11, and switches the voltage received via the connection node with the capacitor C11, that is, the voltage received from the switching circuit 52A. Inductor L11 receives the voltage switched by transistor TR11. Capacitor C11 stores the voltage induced in inductor L11. Diode D15 blocks current from inductor L11 to capacitor C11.

  The control unit 14 controls switching of the transistor TR11 by outputting a control signal to the transistor TR11. Thereby, the step-up / step-down circuit 53 converts the electric power received from the switching circuit 52A into DC electric power and boosts or lowers the electric power.

More specifically, when the input voltage of the step-up / down circuit 53 is Vi, the output voltage is Va, and the on-duty ratio of the transistor TR11 is D, the output voltage Va is expressed as follows.
Va = − {D / (1-D)} × Vi

  As can be seen from this equation, the step-up / step-down circuit 53 can obtain either an output voltage higher or lower than the input voltage depending on the setting of the duty ratio. That is, both Vi <Va and Vi> Va can be realized. Since the output voltage of the step-up / down circuit 53 is inverted with respect to the input voltage, the polarity of the electrical connection with the power transmission insulating circuit 54 is inverted.

  The step-up / down circuit 53 also has a function as a power factor correction circuit. That is, the transistor TR11 is controlled by the control unit 14 so that the phase of the input voltage of the step-up / down circuit 53 matches the phase of the input current.

  The power transmission insulating circuit 54 transmits the power received from the step-up / down circuit 53 while insulating the input side and the output side.

  More specifically, capacitor C 0 stores the electric power received from step-up / down circuit 53. The input switch unit 21 supplies the power received from the step-up / down circuit 53 at the collector of the transistor TR21 and the emitter of the transistor TR22, that is, the power stored in the capacitor C0, to the capacitor C1. The output switch unit 22 supplies the power stored in the capacitor C1 to the capacitor C2. The electric power stored in the capacitor C2 is discharged and output to the switching circuit 52B.

  Also, the power boosted or stepped down by the step-up / down circuit 53 is smoothed by the capacitor C0. In addition, by providing the capacitor C0, it is possible to prevent the ripple of the input current to the power transmission insulating circuit 54 and to stabilize the circuit operation.

  The control unit 14 switches the transistors TR21 to TR24 on and off by outputting control signals to the transistors TR21 to TR24, respectively. The power transmission insulating circuit 54 transmits the power received from the step-up / down circuit 53 to the switching circuit 52B while insulating the step-up / down circuit 53 and the switching circuit 52B by switch control of the control unit 14.

  The switching circuits 52A and 52B output the AC power rectified by the rectification / inverter circuit 51 to the step-up / step-down circuit 53 and the power transmitted by the power transmission insulating circuit 54 to the load 202 via the power supply nodes NP2 and NM2. Whether to output the DC power supplied from the load 202 via the power supply nodes NP2 and NM2 to the step-up / down circuit 53 and output the power transmitted by the power transmission insulating circuit 54 to the rectifier / inverter circuit 51 Switch.

  Here, the switches SWP1, SWP2, SWP3, SWP4 and the switches SWM1, SWM2, SWM3, SWM4 are mechanical switches such as relays, for example. By using a mechanical switch, the cost can be reduced.

  A semiconductor switch may be used instead of the mechanical switch. However, since the semiconductor switch has a large switching loss, the power efficiency in the power conversion device 101 can be increased by using a mechanical switch instead of the semiconductor switch.

[Operation]
Next, an operation when the power transmission insulating circuit according to the first embodiment of the present invention performs power transmission will be described with reference to the drawings.

  FIG. 2 is a diagram showing a switching operation by the power transmission insulating circuit according to the first embodiment of the present invention.

  Referring to FIG. 2, first, in period T1, control unit 14 turns on transistor TR21, turns on transistor TR22, turns off transistor TR23, and turns off transistor TR24. Thereby, the electric charge stored in the capacitor C0 is discharged, and the discharged electric charge is stored in the capacitor C1. Since the transistors TR23 and TR24 are turned off, insulation between the step-up / step-down circuit 53 and the switching circuit 52B is ensured.

  Next, the control unit 14 turns off the transistors TR21 to TR24 in the period T2. This provides a dead time for ensuring insulation between the input side and the output side of the power transmission insulating circuit 54. That is, it is possible to prevent a short circuit between the input side and the output side of the power transmission insulating circuit 54, that is, between the step-up / down circuit 53 and the switching circuit 52 </ b> B via each switch in the input switch unit 21 and each switch in the output switch unit 22. be able to.

  Next, in the period T3, the control unit 14 turns off the transistor TR21, turns off the transistor TR22, turns on the transistor TR23, and turns on the transistor TR24. Thereby, the electric charge stored in the capacitor C1 is discharged, and the discharged electric charge is stored in the capacitor C2. Since the transistors TR21 and TR22 are turned off, insulation between the step-up / step-down circuit 53 and the switching circuit 52B is ensured.

  Next, the control unit 14 turns off the transistors TR21 to TR24 in the period T4. As a result, similarly to the period T2, a dead time for ensuring insulation between the input side and the output side of the power transmission insulating circuit 54 is provided.

  Here, in the period T1 to T4, the capacitor C0 is charged with the electric power from the step-up / down circuit 53, and the electric power stored in the capacitor C2 is discharged and output to the switching circuit 52B. In the periods T2 and T4, there is no charge movement in the capacitor C1.

  The control unit 14 repeats the period T1, the period T2, the period T3, and the period T4 in this order, thereby insulating the input side and the output side of the power transmission insulating circuit 54 from the step-up / down circuit 53. Is transmitted to the switching circuit 52B.

  Next, an operation when the power conversion device according to the first embodiment of the present invention performs bidirectional power conversion will be described with reference to the drawings.

  FIG. 3 is a diagram illustrating an operation in which the power conversion device according to the first embodiment of the present invention supplies power from the infrastructure (house) side to the automobile side. The dotted arrows in FIG. 3 indicate the current flow.

  Referring to FIG. 3, control unit 14 outputs a control signal to transistors TR1 to TR4 to turn off transistors TR1 to TR4. As a result, the rectification / inverter circuit 51 performs full-wave rectification on the AC power received from the AC power supply 201 and outputs it to the switching circuit 52A.

  Further, the control unit 14 outputs control signals to the switches SWP1, SWP2, SWP3, SWP4 and the switches SWM1, SWM2, SWM3, SWM4, whereby the terminals T1 and T2 of the switch SWP1, the terminals T4 and T5 of the switch SWP2 are output. , Terminal T7 and terminal T8 of switch SWP3, terminal T10 and terminal T11 of switch SWP4, terminal T21 and terminal T22 of switch SWM1, terminal T24 and terminal T25 of switch SWM2, terminal T27 and terminal T28 of switch SWM3, terminal of switch SWM4 T30 and terminal T31 are connected to each other.

  That is, switching circuits 52A and 52B electrically connect rectifier / inverter circuit 51 and the input side of step-up / down circuit 53, and electrically connect the output side of power transmission insulating circuit 54 and power supply nodes NP2 and NM2. Connect to.

  Thereby, the AC power rectified by the rectification / inverter circuit 51 is output to the step-up / down circuit 53, and the power transmitted by the power transmission insulating circuit 54 is supplied to the load 202 via the power supply nodes NP2 and NM2.

  FIG. 4 is a diagram illustrating an operation in which the power conversion device according to the first embodiment of the present invention supplies power from the automobile side to the infrastructure (house) side. The dotted arrows in FIG. 4 indicate the flow of current.

  Referring to FIG. 4, control unit 14 outputs a control signal to switches SWP1, SWP2, SWP3, SWP4 and switches SWM1, SWM2, SWM3, SWM4, so that terminals T1 and T3 of switch SWP1 and switches SWP2 Terminals T5 and T6, terminals T7 and T9 of switch SWP3, terminals T11 and T12 of switch SWP4, terminals T21 and T23 of switch SWM1, terminals T25 and T26 of switch SWM2, terminals T27 and T29 of switch SWM3 The terminals T31 and T32 of the switch SWM4 are connected to each other.

  That is, switching circuits 52A and 52B electrically connect power supply nodes NP2 and NM2 and the input side of step-up / down circuit 53, and electrically connect the output side of power transmission insulating circuit 54 and rectifier / inverter circuit 51. Connect to.

  As a result, the DC power supplied from the load 202 via the power supply nodes NP2 and NM2 is output to the step-up / step-down circuit 53, and the power transmitted by the power transmission insulating circuit 54 is output to the rectification / inverter circuit 51.

  The control unit 14 outputs a control signal to the transistors TR1 to TR4 to perform PWM control on the transistors TR1 to TR4. Thereby, rectification / inverter circuit 51 converts the DC power received from switching circuit 52B into AC power, and outputs the AC power to AC power supply 201 via power supply nodes NP1 and NM1.

  The control unit 14 switches each switch of the switching circuits 52A and 52B illustrated in FIGS. 3 and 4 in a state where the power supply to the power conversion device 101 is stopped. With such a configuration, it is possible to prevent the occurrence of an arc when switching each switch, so that it is not necessary to take measures against arcs, and the configuration of the power conversion device 101 can be simplified and the cost can be reduced. The timing of the switch switching operation by the control unit 14 is controlled by a timer, for example. For example, it is conceivable to supply power from the vehicle side to the infrastructure side by discharging the battery during the daytime when the power rate is high, and to charge the battery by supplying power from the infrastructure side to the vehicle side at night when the power rate is low.

  Note that switching of the switches in the switching circuits 52A and 52B may be performed manually.

  By the way, when the insulating circuit for a power supply device described in Patent Document 1 is changed to a bidirectional power converter, the step-up / step-down circuit is bidirectionalized as in the configuration described in Patent Document 2, for example, and the insulating circuit Since it is necessary to increase the number of switches in order to make it bidirectional, the circuit configuration becomes complicated.

  In contrast, in the power conversion device according to the first embodiment of the present invention, the switching circuits 52A and 52B output the AC power rectified by the rectification / inverter circuit 51 to the step-up / down circuit 53, and the power The power transmitted by the transmission insulating circuit 54 is output to the load 202 via the power supply nodes NP2 and NM2, or the DC power supplied from the load 202 via the power supply nodes NP2 and NM2 is output to the step-up / down circuit 53, and Whether to output the power transmitted by the power transmission insulating circuit 54 to the rectification / inverter circuit 51 is switched.

  That is, in the power conversion device according to the first embodiment of the present invention, bidirectional power conversion is performed without switching the step-up / down circuit 53 and the power transmission insulating circuit 54 by the switching circuits 52A and 52B. An apparatus can be realized.

  Therefore, the power conversion device according to the first embodiment of the present invention can perform bidirectional power conversion with a simple configuration.

  In the power conversion device according to the first embodiment of the present invention, the switching circuits 52A and 52B electrically connect the rectification / inverter circuit 51 and the input side of the step-up / down circuit 53, and are used for power transmission. The output side of the insulation circuit 54 and the power supply nodes NP2 and NM2 are electrically connected, or the power supply nodes NP2 and NM2 and the input side of the step-up / down circuit 53 are electrically connected, and the power transmission insulation circuit 54 Whether the output side and the rectification / inverter circuit 51 are electrically connected is switched.

  In this way, by changing the circuit connection by the switching circuits 52A and 52B, it is possible to realize a bidirectional power converter without making the step-up / down circuit 53 and the power transmission insulating circuit 54 bidirectional. It becomes.

  In the power conversion device according to the first embodiment of the present invention, switching circuits 52A and 52B include switches SWP1, SWP2, SWP3 and SWP4 and switches SWM1, SWM2, SWM3 and SWM4.

  In this way, by changing the circuit connection by switching the switches in the switching circuits 52A and 52B, the bidirectional power converter can be realized without making the step-up / down circuit 53 and the power transmission insulating circuit 54 bidirectional. It can be realized.

  In the power conversion device according to the first embodiment of the present invention, in the operation of supplying power from the infrastructure (house) side to the vehicle side, the terminal T1 and terminal T2 of the switch SWP1, the terminal T4 and terminal of the switch SWP2 T5, terminal T7 and terminal T8 of switch SWP3, terminal T10 and terminal T11 of switch SWP4, terminal T21 and terminal T22 of switch SWM1, terminal T24 and terminal T25 of switch SWM2, terminal T27 and terminal T28 of switch SWM3, switch SWM4 Terminals T30 and T31 are connected to each other. In the operation of supplying power from the automobile side to the infrastructure (house) side, the terminal T1 and terminal T3 of the switch SWP1, the terminal T5 and terminal T6 of the switch SWP2, the terminal T7 and terminal T9 of the switch SWP3, and the terminal T11 of the switch SWP4. And terminal T12, terminal T21 and terminal T23 of switch SWM1, terminal T25 and terminal T26 of switch SWM2, terminal T27 and terminal T29 of switch SWM3, and terminal T31 and terminal T32 of switch SWM4, respectively.

  By such switch control, a bidirectional power converter can be realized without making the step-up / step-down circuit 53 and the power transmission insulating circuit 54 bidirectional.

  In addition, the power conversion device according to the first embodiment of the present invention includes the power transmission insulating circuit 54 as shown in FIG. 1, so that the AC voltage can be converted to DC without using a power transformer that occupies a large volume. The power supply nodes NP1 and NM1 and the power supply nodes NP2 and NM2 can be electrically isolated from each other.

  In addition, although the power converter device which concerns on the 1st Embodiment of this invention was set as the structure provided with the control part 14, it is not limited to this. The control unit 14 may be configured to be provided outside the power conversion device 101.

  Further, the power transmission insulating circuit according to the first embodiment of the present invention is configured to include the capacitors C0 to C2, but is not limited to the capacitor and includes other power storage elements such as a coil (inductor). It may be a configuration.

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Second Embodiment>
The present embodiment relates to a power conversion device in which circuit connection is changed as compared with the power conversion device according to the first embodiment. The contents other than those described below are the same as those of the power conversion apparatus according to the first embodiment.

  FIG. 5 is a diagram showing a configuration of a power conversion device according to the second embodiment of the present invention.

  Referring to FIG. 5, power conversion device 102 includes switching circuits 62 </ b> A and 62 </ b> B instead of switching circuits 52 </ b> A and 52 </ b> B, as compared with the power conversion device according to the first embodiment of the present invention. A step-up / step-down circuit 63 is provided instead of 53, and a power transmission insulating circuit 64 is provided instead of the power transmission insulating circuit 54.

  The switching circuit 62A includes a switch SWP11 and a switch SWM11. The switching circuit 62B includes a switch SWP12 and a switch SWM12. The power transmission insulating circuit 64 includes capacitors C0 to C2, diodes D9 to D12, a first power transmission switch unit 31, and a second power transmission switch unit 32. The first power transfer switch unit 31 includes transistors TR21 and TR22 as switching elements and diodes D5 and D6. The second power transfer switch unit 32 includes transistors TR23 and TR24 as switching elements and diodes D7 and D8.

  The step-up / step-down circuit 63 has a positive side node NP10, a negative side node NM10 electrically connected to the rectification / inverter circuit 51, and a positive side node NP11, a negative side node NM11 electrically connected to the switching circuit 62A.

  The power transmission insulating circuit 64 is electrically connected to the positive-side node NP12, the negative-side node NM12, and the power supply nodes NP2 and NM2 electrically connected to the step-up / step-down circuit 63 via the switching circuit 62A via the switching circuit 62B. Node NP13, NM13 connected to the.

  In the switching circuit 62A, the switch SWP11 includes a terminal T1 connected to the negative node NM11 of the step-up / down circuit 63, and a terminal T2 connected to the first end of the capacitor C0 of the power transmission insulating circuit 64, that is, the positive node NP12. And a terminal T3 connected to the second end of the capacitor C0 of the power transmission insulating circuit 64, that is, the negative node NM12. The switch SWM11 includes a terminal T7 connected to the positive side node NP11 of the step-up / down circuit 63, a terminal T8 connected to the negative side node NM12 of the power transmission insulating circuit 64, and a positive side node of the power transmission insulating circuit 64. And a terminal T9 connected to the NP12.

  In the switching circuit 62B, the switch SWP12 includes a terminal T4 connected to the first end of the capacitor C2 of the power transmission insulating circuit 64, that is, the positive node NP13, a terminal T5 connected to the positive power supply node NP2, and a negative side. A terminal T6 connected to power supply node NM2. The switch SWM12 is connected to the second end of the capacitor C2 of the power transmission insulating circuit 64, that is, the terminal T10 connected to the negative side node NM13, the terminal T11 connected to the negative side power supply node NM2, and the positive side power supply node NP2. Terminal T12.

  The step-up / down circuit 63 is electrically connected to the rectification / inverter circuit 51 to step up or step down the received power. More specifically, the step-up / down circuit 63 converts the AC power received from the rectifier / inverter circuit 51 at the nodes NP10 and NM10 into DC power, boosts or steps down and outputs the DC power from the nodes NP11 and NM11, and the node NP11. , NM11 can convert the power received from the switching circuit 62A into DC power, and step up or step down and output from the nodes NP10, NM10. For example, the step-up / step-down circuit 63 has the same configuration as the step-up / step-down circuit described in Patent Document 2.

  The power transmission insulating circuit 64 transmits power between the nodes NP12 and NM12 and the nodes NP13 and NM13 while insulating the nodes NP12 and NM12 and the nodes NP13 and NM13.

  The switching circuit 62A switches the polarity of the electrical connection between the nodes NP11 and NM11 of the step-up / step-down circuit 63 and the nodes NP12 and NM12 of the power transmission insulating circuit 64.

  The switching circuit 62B switches the polarity of the electrical connection between the nodes NP13 and NM13 of the power transmission insulating circuit 64 and the power supply nodes NP2 and NM2.

[Operation]
Next, an operation when the power conversion device according to the second embodiment of the present invention performs bidirectional power conversion will be described with reference to the drawings.

  FIG. 6 is a diagram illustrating an operation in which the power conversion apparatus according to the second embodiment of the present invention supplies power from the infrastructure (house) side to the automobile side. A dotted arrow in FIG. 6 indicates a current flow.

  Referring to FIG. 6, control unit 14 outputs a control signal to transistors TR1 to TR4 to turn off transistors TR1 to TR4. As a result, the rectification / inverter circuit 51 performs full-wave rectification on the AC power received from the AC power supply 201 and outputs it to the step-up / down circuit 63.

  Further, the control unit 14 outputs control signals to the switches SWP11 and SWP12 and the switches SWM11 and SWM12, whereby the terminal T1 and the terminal T3 of the switch SWP11, the terminal T4 and the terminal T5 of the switch SWP12, and the terminal T7 and the terminal of the switch SWM11. T9, the terminal T10 and the terminal T11 of the switch SWP12 are respectively connected.

  That is, the switching circuit 62A connects the positive side node NP11 of the step-up / down circuit 63 and the positive side node NP12 of the power transmission insulating circuit 64, and the negative side node NM11 of the step-up / down circuit 63 and the negative side of the power transmission insulating circuit 64. The side node NM12 is connected. The switching circuit 62B connects the positive node NP13 and the positive power supply node NP2 of the power transmission insulating circuit 64, and connects the negative node NM13 and the negative power supply node NM2 of the power transmission insulating circuit 64.

  As a result, the power boosted or stepped down by the step-up / step-down circuit 63 is output to the power transmission insulating circuit 64, and this DC power is supplied to the load 202 by the power transmission insulating circuit 64 via the power supply nodes NP2 and NM2.

  FIG. 7 is a diagram illustrating an operation in which the power conversion device according to the second embodiment of the present invention supplies power from the automobile side to the infrastructure (house) side. A dotted arrow in FIG. 7 indicates a current flow.

  Referring to FIG. 7, control unit 14 outputs a control signal to switches SWP11 and SWP12 and switches SWM11 and SWM12, whereby terminal T1 and terminal T2 of switch SWP11, terminal T4 and terminal T6 of switch SWP12, and switch SWM11. The terminal T7 and the terminal T8 are connected to the terminal T10 and the terminal T12 of the switch SWP12, respectively.

  That is, the switching circuit 62A connects the positive side node NP11 of the step-up / down circuit 63 and the negative side node NM12 of the power transmission insulating circuit 64, and the positive side node NM11 of the step-up / down circuit 63 and the positive node of the power transmission insulating circuit 64 The side node NP12 is connected. The switching circuit 62B connects the positive node NP13 and the negative power supply node NM2 of the power transmission insulating circuit 64, and connects the negative node NM13 and the positive power supply node NP2 of the power transmission insulating circuit 64.

  As a result, DC power is supplied from the load 202 to the power transmission insulating circuit 64 via the power supply nodes NP2 and NM2, and this power is transmitted to the step-up / down circuit 63 by the power transmission insulating circuit 64. The voltage is stepped up or stepped down by the voltage circuit 63 and output to the rectifier / inverter circuit 51.

  The control unit 14 outputs a control signal to the transistors TR1 to TR4 to perform PWM control on the transistors TR1 to TR4. Thereby, rectification / inverter circuit 51 converts the DC power received from switching circuit 62B into AC power, and outputs the AC power to AC power supply 201 via power supply nodes NP1 and NM1.

  In addition, the control unit 14 switches each switch in the switching circuits 62A and 62B illustrated in FIGS. 6 and 7 in a state where the power supply to the power conversion apparatus 102 is stopped. With such a configuration, it is possible to prevent an arc from being generated when switching each switch, so that it is not necessary to take an arc countermeasure, and the configuration can be simplified and the cost can be reduced. The timing of the switch switching operation by the control unit 14 is controlled by a timer, for example. For example, it is conceivable to supply power from the vehicle side to the infrastructure side by discharging the battery during the daytime when the power rate is high, and to charge the battery by supplying power from the infrastructure side to the vehicle side at night when the power rate is low.

  Note that switching of the switches in the switching circuits 62A and 62B may be performed manually.

  Next, an operation when the power transmission insulating circuit according to the second embodiment of the present invention performs power transmission will be described with reference to the drawings.

  First, the operation when the power transmission insulating circuit according to the second embodiment of the present invention performs power transmission in the first power conversion operation will be described with reference to the drawings.

  FIG. 8 is a diagram showing a switching operation by the power transmission insulating circuit according to the second embodiment of the present invention.

  Referring to FIG. 8, in the first power conversion operation, that is, the power supply operation from the infrastructure (house) side to the vehicle side, first, control unit 14 turns on transistor TR21 and turns on transistor TR22 in period T1. The transistor TR23 is turned off and the transistor TR24 is turned off. Thereby, the electric charge stored in the capacitor C0 is discharged, and the discharged electric charge is stored in the capacitor C1. Since the transistors TR23 and TR24 are turned off, insulation between the switching circuit 62A and the switching circuit 62B is ensured.

  Next, the control unit 14 turns off the transistors TR21 to TR24 in the period T2. This provides a dead time for ensuring insulation between the input side and the output side of the power transmission insulating circuit 64. That is, between the input side and the output side of the insulating circuit 64 for power transmission via each switch in the first power transmission switch unit 31 and each switch in the second power transmission switch unit 32, that is, between the switching circuit 62A and the switching circuit 62B. A short circuit can be prevented.

  Next, in the period T3, the control unit 14 turns off the transistor TR21, turns off the transistor TR22, turns on the transistor TR23, and turns on the transistor TR24. Thereby, the electric charge stored in the capacitor C1 is discharged, and the discharged electric charge is stored in the capacitor C2. Since the transistors TR21 and TR22 are turned off, insulation between the switching circuit 62A and the switching circuit 62B is ensured.

  Next, the control unit 14 turns off the transistors TR21 to TR24 in the period T4. As a result, as in the period T2, a dead time for ensuring insulation between the input side and the output side of the power transmission insulating circuit 64 is provided.

  Here, in the period T1 to T4, the capacitor C0 is charged with the electric power from the step-up / down circuit 63, and the electric power stored in the capacitor C2 is discharged and output to the switching circuit 62B. In the periods T2 and T4, there is no charge movement in the capacitor C1.

  The control unit 14 repeats the period T1, the period T2, the period T3, and the period T4 in this order to insulate the input side and the output side of the power transmission insulating circuit 64 from the switching circuit 62A. The electric power is transmitted to the switching circuit 62B.

  In the second power conversion operation, that is, the power supply operation from the automobile side to the infrastructure (house) side, first, in the period T11, the control unit 14 turns off the transistor TR21, turns off the transistor TR22, and turns on the transistor TR23. Then, the transistor TR24 is turned on. Thereby, the electric charge stored in the capacitor C2 is discharged, and the discharged electric charge is stored in the capacitor C1. Since the transistors TR21 and TR22 are turned off, insulation between the switching circuit 62A and the switching circuit 62B is ensured.

  Next, the control unit 14 turns off the transistors TR21 to TR24 in the period T12. This provides a dead time for ensuring insulation between the input side and the output side of the power transmission insulating circuit 64. That is, between the input side and the output side of the power transmission insulating circuit 64 via each switch in the first power transfer switch unit 31 and each switch in the second power transfer switch unit 32, that is, between the switching circuit 62B and the switching circuit 62A. A short circuit can be prevented.

  Next, in the period T13, the control unit 14 turns on the transistor TR21, turns on the transistor TR22, turns off the transistor TR23, and turns off the transistor TR24. Thereby, the electric charge stored in the capacitor C1 is discharged, and the discharged electric charge is stored in the capacitor C0. Since the transistors TR23 and TR24 are turned off, insulation between the switching circuit 62A and the switching circuit 62B is ensured.

  Next, the control unit 14 turns off the transistors TR21 to TR24 in the period T14. Thereby, similarly to the period T12, a dead time for ensuring insulation between the input side and the output side of the power transmission insulating circuit 64 is provided.

  Here, in the periods T11 to T14, the capacitor C2 is charged by the power from the load 202, and the power stored in the capacitor C0 is discharged and output to the switching circuit 62A. In the periods T12 and T14, there is no charge movement in the capacitor C1.

  The control unit 14 repeats the period T11, the period T12, the period T13, and the period T14 in this order to insulate the input side and the output side of the power transmission insulating circuit 64 from the switching circuit 62B. The electric power is transmitted to the switching circuit 62A.

  By the way, when the insulation circuit for power supply devices described in Patent Document 1 is changed to a bidirectional power conversion device, it is necessary to increase the number of switches in order to make the insulation circuit bidirectional. It becomes complicated.

  On the other hand, in the power conversion device according to the second embodiment of the present invention, the switching circuit 62A includes the nodes NP11 and NM11 of the step-up / down circuit 63 and the nodes NP12 and NM12 of the power transmission insulating circuit 64. Switch the polarity of the electrical connection between. The switching circuit 62B switches the polarity of the electrical connection between the nodes NP13 and NM13 of the power transmission insulating circuit 64 and the power supply nodes NP2 and NM2.

  In other words, in the power conversion device according to the second embodiment of the present invention, the circuit connection is changed by the switching circuits 62A and 62B, so that the power transmission insulating circuit 64 is not made bidirectional, and the bidirectional type is changed. A power conversion device can be realized.

  Therefore, in the power conversion device according to the second embodiment of the present invention, bidirectional power conversion can be performed with a simple configuration, similarly to the power conversion device according to the first embodiment of the present invention. .

  In the power converter according to the second embodiment of the present invention, the step-up / step-down circuit 63 includes a positive side node NP10, a negative side node NM10, and a switching circuit 62A electrically connected to the rectifier / inverter circuit 51. It has a positive side node NP11 and a negative side node NM11 that are electrically connected, and boosts or steps down the power received at the positive side node NP10 and the negative side node NM10 and outputs it from the positive side node NP11 and the negative side node NM11. The operation and the operation of boosting or stepping down the power received at the positive side node NP11 and the negative side node NM11 and outputting from the positive side node NP10 and the negative side node NM10 can be performed.

  Thus, the configuration of the switching circuits 62A and 62B can be simplified by using the bidirectional step-up / down circuit.

  In addition, in the power conversion device according to the second embodiment of the present invention, switching circuits 62A and 62B include switches SWP11 and SWP12 and switches SWM11 and SWM12.

  As described above, in the power conversion device according to the second embodiment of the present invention, it is necessary to make the step-up / step-down circuit bidirectional, as compared with the power conversion device according to the first embodiment of the present invention. The total number of switches in the switching circuits 62A and 62B can be reduced from eight to four. Further, since the wiring between the switching circuits 62A and 62B becomes unnecessary, it is possible to prevent the wiring from becoming complicated. In power converters 101 and 102, for example, a harness is used as wiring in order to transmit a certain amount of power. However, in the power converter according to the second embodiment of the present invention, the length of such a harness is used. It is possible to shorten the length.

  Further, in the power conversion device according to the second embodiment of the present invention, in the operation of supplying power from the infrastructure (house) side to the automobile side, the terminal T1 and terminal T3 of the switch SWP11, the terminal T4 and terminal of the switch SWP12 T5, terminal T7 and terminal T9 of switch SWM11, and terminal T10 and terminal T11 of switch SWP12 are connected to each other. Further, in the operation of supplying electric power from the automobile side to the infrastructure (house) side, the terminals T1 and T2 of the switch SWP11, the terminals T4 and T6 of the switch SWP12, the terminals T7 and T8 of the switch SWM11, and the terminal T10 of the switch SWP12. And the terminal T12 are connected to each other.

  Such switch control makes it possible to realize a bidirectional power converter without making the power transmission insulating circuit 64 bidirectional.

  In addition, the power conversion device according to the first embodiment of the present invention includes the power transmission insulating circuit 64 as shown in FIG. 5 so that the AC voltage can be converted to DC without using a power transformer that occupies a large volume. The power supply nodes NP1 and NM1 and the power supply nodes NP2 and NM2 can be electrically isolated from each other.

  Since other configurations and operations are the same as those of the power conversion device according to the first embodiment, detailed description thereof will not be repeated here.

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Third Embodiment>
The present embodiment relates to a power conversion device in which an inverter circuit is provided outside as compared with the power conversion device according to the first embodiment. The contents other than those described below are the same as those of the power conversion apparatus according to the first embodiment.

  FIG. 9 is a diagram showing a configuration of a power conversion system according to the third embodiment of the present invention.

  Referring to FIG. 9, a power conversion system 301 includes a power conversion device 103, an infrastructure side device 150, an AC power supply 201, a battery 202, a solar power generation module 205, AC external terminals TP1 and TM1, and a DC. External terminals TP2 and TM2 are provided.

  The power converter 103 includes a rectifier circuit 61, switching circuits 72 </ b> A and 52 </ b> B, a step-up / down circuit 53, a power transmission insulating circuit 54, and a control unit 14. The rectifier circuit 61 includes diodes D1 to D4. Switching circuit 72A includes a switch SWP2 and a switch SWM2.

  The infrastructure side device 150 includes a power conditioner (inverter circuit) 204, a switching circuit 72C, AC external terminals TP11 and TM11, and DC external terminals TP12 and TM12. The switching circuit 72C includes switches SWP21 and SWM21.

  In the rectifier circuit 61, the anode of the diode D1 and the cathode of the diode D2 are connected to the power supply node NP1 via the AC external terminals TP1 and TP11, and the anode of the diode D3 and the cathode of the diode D4 are connected via the AC external terminals TM1 and TM11. Connected to power supply node NM1, the cathode of diode D1 and the cathode of diode D3 are connected, and the anode of diode D2 and the anode of diode D4 are connected.

  In the switching circuit 72A, the switch SWP2 has a terminal T4 connected to the cathodes of the diodes D1 and D3 of the rectifier circuit 61, a terminal T5 electrically connected to the input side of the step-up / down circuit 53, and a terminal T6. . The switch SWM2 has a terminal T24 connected to the anodes of the diodes D2 and D4 of the rectifier circuit 61, a terminal T25 electrically connected to the input side of the step-up / down circuit 53, and a terminal T26.

  In the switching circuit 52B, the switch SWP3 has a terminal T7 electrically connected to the output side of the power transmission insulating circuit 54, a terminal T8, and a terminal T9 electrically connected to the DC external terminal TP2. The switch SWM3 has a terminal T27 electrically connected to the output side of the power transmission insulating circuit 54, a terminal T28, and a terminal T29 electrically connected to the DC external terminal TM2. The switch SWP4 has a terminal T10 connected to the terminal T8 of the switch SWP3, a terminal T11 electrically connected to the positive power supply node NP2, and a terminal T12 connected to the terminal T6 of the switch SWP2. Switch SWM4 has terminal T30 connected to terminal T28 of switch SWM3, T31 electrically connected to power supply node NM2, and terminal T32 connected to terminal T26 of switch SWM2.

  In the switching circuit 72C of the infrastructure side device 150, the switch SWP21 is connected to the terminal T41 electrically connected to the power conditioner 204, the terminal T42 electrically connected to the DC external terminal TP12, and the photovoltaic power generation module 205. And an electrically connected terminal T43. The switch SWM21 includes a terminal T44 electrically connected to the power conditioner 204, a terminal T45 electrically connected to the DC external terminal TM12, and a terminal T46 electrically connected to the solar power generation module 205. Have.

  For example, when the connector including the AC external terminals TP1, TM1 and the DC external terminals TP2, TM2 and the connector including the AC external terminals TP11, TM11 and the DC external terminals TP12, TM12 are fitted together, the AC external terminals TP1, TM1 and DC external terminals TP2 and TM2, AC external terminals TP11 and TM11, and DC external terminals TP12 and TM12 are connected to each other, and power converter 103 and infrastructure apparatus 150 are electrically connected.

  The power converter 103 converts AC power supplied from the AC power source 201 via the AC external terminals TP1 and TM1 into DC power and supplies the DC power to the load 202. Further, the power conversion device 103 supplies the DC power supplied from the load 202 to the infrastructure side device 150 via the DC external terminals TP2 and TM2.

  That is, the power conversion device 103 converts the AC power supplied from the power supply nodes NP1 and NM1 into DC power and supplies the power to the power supply nodes NP2 and NM2, and the power conversion device 103 supplied from the power supply nodes NP2 and NM2. A second power conversion operation for outputting DC power to the power conditioner 204 via the step-up / step-down circuit 53 and the power transmission insulating circuit 54 is performed.

  The photovoltaic power generation module 205 generates direct-current power from sunlight and outputs it to the switches SWP21 and SWM21.

  The switches SWP21 and SWM21 output the DC power received from the power converter 103 via the DC external terminals TP12 and TM12 to the power conditioner 204 or the DC power received from the solar power generation module 205 to the power conditioner 204. Switch output.

  The power conditioner 204 converts the DC power received via the switches SWP21 and SWM21 into AC power and supplies the AC power to the AC power supply 201 via the power supply nodes NP1 and NM1.

  Rectifier circuit 61 includes, for example, a diode bridge composed of diodes D1 to D4, and full-waves AC power supplied from AC power supply 201 via power supply nodes NP1 and NM1 and AC external terminals TP1, TP11, TM1 and TM11. Rectify and output to the switching circuit 72A.

  The switching circuits 72A and 52B output the AC power rectified by the rectifier circuit 61 to the step-up / down circuit 53, and output the power transmitted by the power transmission insulating circuit 54 to the load 202 via the power supply nodes NP2 and NM2. Alternatively, it is switched between outputting the DC power supplied from the load 202 via the power supply nodes NP2 and NM2 to the step-up / down circuit 53 and outputting the power transmitted by the power transmission insulating circuit 54 to the power conditioner 204.

[Operation]
Next, an operation when the power conversion device according to the third embodiment of the present invention performs bidirectional power conversion will be described with reference to the drawings.

  FIG. 10 is a diagram illustrating an operation in which the power conversion device according to the third embodiment of the present invention supplies power from the infrastructure (house) side to the automobile side. A dotted arrow in FIG. 10 indicates a current flow.

  Referring to FIG. 10, for example, in switching circuit 72C of infrastructure side device 150, terminal T41 and terminal T43 of switch SWP21 are connected, and terminal T44 and terminal T46 of switch SWM21 are connected. The switches SWP21 and SWM21 are controlled by, for example, the power conditioner 204.

  Thereby, the DC power generated by the photovoltaic power generation module 205 is output to the power conditioner 204.

  In the power conversion device 103, the control unit 14 outputs control signals to the switches SWP2, SWP3, SWP4 and the switches SWM2, SWM3, SWM4, whereby the terminals T4 and T5 of the switch SWP2, the terminals T7 and T8 of the switch SWP3 are output. The terminals T10 and T11 of the switch SWP4, the terminals T24 and T25 of the switch SWM2, the terminals T27 and T28 of the switch SWM3, and the terminals T30 and T31 of the switch SWM4 are respectively connected.

  That is, switching circuits 72A and 52B electrically connect rectifier circuit 61 and the input side of step-up / down circuit 53, and electrically connect the output side of power transmission insulating circuit 54 and power supply nodes NP2 and NM2. To do.

  Thereby, the AC power rectified by the rectifier circuit 61 is output to the step-up / step-down circuit 53, and the power transmitted by the power transmission insulating circuit 54 is supplied to the load 202 via the power supply nodes NP2 and NM2.

  Here, for example, the infrastructure side device 150 monitors the presence or absence of electrical connection with the power conversion device 103 and, when detecting the electrical connection, instructs the control unit 14 in the power conversion device 103 to start the first power conversion operation. Instruct. For example, the power conditioner 204 in the infrastructure device 150 instructs the control unit 14 to start the first power conversion operation by wired communication or wireless communication.

  And the control part 14 receives this instruction | indication, controls the switching circuit 72A, 52B as mentioned above, 1st power conversion operation | movement of the power converter device 103, ie, the electric power from the infrastructure (house) side to the motor vehicle side The supply operation is started.

  With such a configuration, it is possible to automatically recognize that the power conversion device 103 is connected to the infrastructure side device 150 and appropriately start power supply to the load 202.

  FIG. 11 is a diagram illustrating an operation in which the power conversion device according to the third embodiment of the present invention supplies power from the automobile side to the infrastructure (house) side. The dotted arrows in FIG. 11 indicate the flow of current.

  Referring to FIG. 11, in switching circuit 72C of infrastructure side device 150, terminal T41 and terminal T42 of switch SWP21 are connected, and terminal T44 and terminal T45 of switch SWM21 are connected. The switches SWP21 and SWM21 are controlled by, for example, the power conditioner 204.

  In the power conversion device 103, the control unit 14 outputs control signals to the switches SWP2, SWP3, SWP4 and the switches SWM2, SWM3, SWM4, so that the terminals T5 and T6 of the switch SWP2, the terminals T7 and T9 of the switch SWP3 are output. The terminals T11 and T12 of the switch SWP4, the terminals T25 and T26 of the switch SWM2, the terminals T27 and T29 of the switch SWM3, and the terminals T31 and T32 of the switch SWM4 are respectively connected.

  That is, switching circuits 72A and 52B electrically connect power supply nodes NP2 and NM2 and the input side of step-up / down circuit 53, and electrically connect the output side of power transmission insulating circuit 54 and DC external terminals TP2 and TM2. Connect.

  As a result, the DC power supplied from the load 202 via the power supply nodes NP2 and NM2 is output to the step-up / step-down circuit 53, and the power transmitted by the power transmission insulating circuit 54 is output to the power conditioner 204.

  In addition, the infrastructure device 150 monitors the amount of power stored in the load 202, which is a storage battery, for example, while the power conversion device 103 is performing the second power conversion operation, that is, the power supply operation from the vehicle side to the infrastructure (house) side. To do. And the infrastructure side apparatus 150 will instruct | indicate the stop of 2nd power conversion operation | movement to the control part 14 in the power converter device 103, when the electrical storage amount becomes a predetermined value or less.

  And the control part 14 stops the 2nd power conversion operation | movement of the power converter device 103 by controlling each switch in switching circuit 72A, 52B to an open state in response to this instruction | indication.

  Furthermore, the infrastructure side apparatus 150 outputs the DC power generated by the photovoltaic power generation module 205 to the infrastructure side apparatus 150 by controlling the switching circuit 72C.

  For example, the control unit 14 in the power conversion device 103 monitors the charge amount of the load 202 that is a storage battery, and periodically notifies the charge amount to the power conditioner 204 in the infrastructure device 150 by wired communication or wireless communication. Then, the power conditioner 204 controls the switching circuit 72C based on the notified charge amount, and controls the switching circuits 72A and 52B via the control unit 14.

  With such a configuration, the charge amount of the load 202 that is a storage battery can be automatically monitored, and the charging source of the AC power supply 201 can be appropriately switched.

  As described above, in the power conversion device according to the third embodiment of the present invention, the switching circuits 72A and 52B output the AC power rectified by the rectifier circuit 61 to the step-up / down circuit 53 and are used for power transmission. The power transmitted by the insulation circuit 54 is output to the load 202 via the power supply nodes NP2 and NM2, or the DC power supplied from the load 202 via the power supply nodes NP2 and NM2 is output to the step-up / down circuit 53 and the power is transmitted. Whether to output the power transmitted by the insulation circuit 54 to the power conditioner 204 is switched.

  That is, in the power conversion device according to the third embodiment of the present invention, bidirectional power conversion is performed by switching circuits 72A and 52B without bidirectionalizing buck-boost circuit 53 and power transmission insulating circuit 54. An apparatus can be realized.

  Therefore, the power conversion device according to the third embodiment of the present invention can perform bidirectional power conversion with a simple configuration.

  Further, in the power conversion device according to the third embodiment of the present invention, the switching circuits 72A and 52B electrically connect the rectifier circuit 61 and the input side of the step-up / down circuit 53, and provide a power transmission insulating circuit. 54 is electrically connected to the power supply nodes NP2 and NM2, or the power supply nodes NP2 and NM2 are electrically connected to the input side of the step-up / down circuit 53, and the output side of the power transmission insulating circuit 54 is connected. And whether or not the power conditioner 204 is electrically connected.

  As described above, by changing the circuit connection by the switching circuits 72A and 52B, it is possible to realize a bidirectional power converter without making the step-up / down circuit 53 and the power transmission insulating circuit 54 bidirectional. It becomes.

  In the power conversion device according to the third embodiment of the present invention, switching circuits 72A and 52B include switches SWP2, SWP3 and SWP4 and switches SWM2, SWM3 and SWM4.

  In this way, by changing the circuit connection by switching the switches in the switching circuits 72A and 52B, the bidirectional power converter can be realized without making the step-up / down circuit 53 and the power transmission insulating circuit 54 bidirectional. It can be realized.

  Further, in the power conversion device according to the third embodiment of the present invention, in the operation of supplying power from the infrastructure (house) side to the vehicle side, the terminal T4 and terminal T5 of the switch SWP2, the terminal T7 and terminal of the switch SWP3 T8, terminal T10 and terminal T11 of switch SWP4, terminal T24 and terminal T25 of switch SWM2, terminal T27 and terminal T28 of switch SWM3, and terminal T30 and terminal T31 of switch SWM4 are connected to each other. Further, in the operation of supplying electric power from the automobile side to the infrastructure (house) side, the terminals T5 and T6 of the switch SWP2, the terminals T7 and T9 of the switch SWP3, the terminals T11 and T12 of the switch SWP4, and the terminal T25 of the switch SWM2 And a terminal T26, a terminal T27 and a terminal T29 of the switch SWM3, and a terminal T31 and a terminal T32 of the switch SWM4, respectively.

  By such switch control, a bidirectional power converter can be realized without making the step-up / step-down circuit 53 and the power transmission insulating circuit 54 bidirectional.

  Further, in the power conversion device according to the third embodiment of the present invention, DC power is output to AC external terminals TP1 and TM1 for receiving AC power supplied from power supply nodes NP1 and NM1, and to power conditioner 204. DC external terminals TP2 and TM2 are provided.

  Thus, in addition to the terminal for alternating current power supply 201, the structure provided with the terminal for power conditioner 204 can secure the supply path of direct current power from power converter 103 to infrastructure side device 150. .

  Further, in the power conversion system according to the third embodiment of the present invention, power conversion apparatus 103 converts AC power supplied from power supply nodes NP1 and NM1 into DC power and supplies the power to power supply nodes NP2 and NM2. A first power conversion operation and a second power conversion operation for outputting DC power supplied from the power supply nodes NP2 and NM2 to the infrastructure side device 150 are performed. Then, the switching circuits 72A and 52B in the power conversion device 103 output the AC power rectified by the rectifier circuit 61 to the step-up / down circuit 53 and supply the power transmitted by the power transmission insulating circuit 54 to the power supply nodes NP2 and NM2. Or the DC power supplied from the power supply nodes NP2 and NM2 is output to the step-up / down circuit 53 and the power transmitted by the power transmission insulating circuit 54 is switched to the infrastructure side device 150. And the infrastructure side apparatus 150 converts the received direct-current power into alternating current power, and supplies it to power supply node NP1, NM1.

  With such a configuration, it is not necessary to provide an inverter circuit for converting DC power to AC power in the power converter 103, and it is sufficient to provide a rectifier circuit. Therefore, the power according to the first embodiment of the present invention Compared with the conversion device, the configuration can be simplified.

  In the power conversion system according to the third embodiment of the present invention, the switching circuit 72C outputs the DC power generated by the photovoltaic power generation module 205 to the infrastructure side device 150 or receives it from the power conversion device 103. Whether to output the direct current power to the infrastructure side device 150 is switched.

  With such a configuration, the power conditioner 204 for the photovoltaic power generation module 205 can be used as an inverter circuit for converting the DC power output from the power converter 103 into AC power. A conversion system can be constructed.

  Since other configurations and operations are the same as those of the power conversion device according to the first embodiment, detailed description thereof will not be repeated here.

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Fourth embodiment>
The present embodiment relates to a power conversion device that uses a step-up function or a step-down function of an external inverter circuit as compared with the power conversion device according to the third embodiment. The contents other than those described below are the same as those of the power conversion system according to the third embodiment.

  FIG. 12 is a diagram showing a configuration of a power conversion system according to the fourth embodiment of the present invention.

  12, power conversion system 302 includes power conversion device 104, infrastructure side device 150, AC power supply 201, battery 202, solar power generation module 205, AC external terminals TP1 and TM1, and DC. External terminals TP2 and TM2 are provided.

  The power conversion device 104 includes a rectifier circuit 61, switching circuits 82 </ b> A and 52 </ b> B, a step-up / down circuit 53, a power transmission insulating circuit 54, and a control unit 14. Switching circuit 82A includes a switch SWP2 and a switch SWM2.

  In the step-up / down circuit 53, the transistor TR11 includes a gate that receives a control signal from the control unit 14, a collector connected to the cathodes of the diodes D1 and D3 and the first terminal of the capacitor C11, a cathode of the diode D15, and an inductor L11. And an emitter connected to the first end. The anode of the diode D15 and the first end of the capacitor C12 are connected. The second end of the capacitor C11, the second end of the inductor L11, the second end of the capacitor C12, and the anodes of the diodes D2 and D4 are connected.

  In the switching circuit 82A, the switch SWP2 is electrically connected to the output side of the step-up / down circuit 53, that is, the terminal T4 connected to the anode of the diode D15 and the first end of the capacitor C12, and the power transmission insulating circuit 54. A terminal T5 connected to the second end of the capacitor C0 of the power transmission insulating circuit 54 and the cathode of the diode D10, and a terminal T6 connected to the terminal T12 of the switch SWP4. Have The switch SWM2 is electrically connected to the output side of the step-up / down circuit 53, that is, the terminal T24 connected to the second end of the capacitor C12 and the input side of the power transmission insulating circuit 54. That is, it has a terminal T25 connected to the first end of the capacitor C0 of the power transmission insulating circuit 54 and the anode of the diode D9, and a terminal T26 connected to the terminal T32 of the switch SWM4.

  In the power transmission insulating circuit 54, the capacitor C0 has a first end connected to the anode of the diode D9 and the terminal T25 of the switch SWM2, and a second end connected to the cathode of the diode D10 and the terminal T5 of the switch SWP2. Have.

  The power converter 104 converts AC power supplied from the AC power supply 201 via the AC external terminals TP1 and TM1 into DC power and supplies the DC power to the load 202. Further, the power conversion device 104 outputs the DC power supplied from the load 202 to the infrastructure device 150 via the DC external terminals TP2 and TM2.

  That is, the power conversion device 104 converts the AC power supplied from the power supply nodes NP1 and NM1 into DC power and supplies it to the power supply nodes NP2 and NM2, and the power conversion device 104 supplied from the power supply nodes NP2 and NM2. A second power conversion operation for outputting DC power to the power conditioner 204 via the power transmission insulating circuit 54 is performed.

  The power conditioner 204 boosts or lowers the DC power received via the switches SWP21 and SWM21, converts the DC power into AC power, and supplies the AC power to the AC power supply 201 via the power supply nodes NP1 and NM1.

  Rectifier circuit 61 includes, for example, a diode bridge composed of diodes D1 to D4, and full-waves AC power supplied from AC power supply 201 via power supply nodes NP1 and NM1 and AC external terminals TP1, TP11, TM1 and TM11. Rectify and output to the step-up / down circuit 53.

  Switching circuits 82A and 52B output the power boosted or stepped down by step-up / down circuit 53 to power transmission insulating circuit 54 and load the power transmitted by power transmission insulating circuit 54 via power supply nodes NP2 and NM2. 202, or the DC power supplied from the load 202 via the power supply nodes NP2 and NM2 is output to the power transmission insulating circuit 54, and the power transmitted by the power transmission insulating circuit 54 is supplied to the power conditioner 204. Switch output.

[Operation]
Next, an operation when the power conversion device according to the fourth embodiment of the present invention performs bidirectional power conversion will be described with reference to the drawings.

  FIG. 13: is a figure which shows the operation | movement in which the power converter device which concerns on the 4th Embodiment of this invention supplies electric power from the infrastructure (house) side to the motor vehicle side. Dotted arrows in FIG. 13 indicate the flow of current.

  Referring to FIG. 13, for example, in switching circuit 72C of infrastructure side device 150, terminal T41 and terminal T43 of switch SWP21 are connected, and terminal T44 and terminal T46 of switch SWM21 are connected. The switches SWP21 and SWM21 are controlled by, for example, the power conditioner 204.

  Thereby, the DC power generated by the photovoltaic power generation module 205 is output to the power conditioner 204.

  In the power conversion device 104, the control unit 14 outputs control signals to the switches SWP2, SWP3, SWP4 and the switches SWM2, SWM3, SWM4, so that the terminals T4 and T5 of the switch SWP2, the terminals T7 and T8 of the switch SWP3 are output. The terminals T10 and T11 of the switch SWP4, the terminals T24 and T25 of the switch SWM2, the terminals T27 and T28 of the switch SWM3, and the terminals T30 and T31 of the switch SWM4 are respectively connected.

  That is, switching circuits 82A and 52B electrically connect the output side of step-up / step-down circuit 53 and the input side of power transmission insulating circuit 54, and output side of power transmission insulating circuit 54 and power supply nodes NP2 and NM2. And electrically connect.

  As a result, the power boosted or stepped down by the step-up / down circuit 53 is output to the power transmission insulating circuit 54, and the power transmitted by the power transmission insulating circuit 54 is supplied to the load 202 via the power supply nodes NP2 and NM2. The

  FIG. 14: is a figure which shows the operation | movement in which the power converter device which concerns on the 4th Embodiment of this invention supplies electric power from the motor vehicle side to the infrastructure (house) side. The dotted arrows in FIG. 14 indicate the flow of current.

  Referring to FIG. 14, in switching circuit 72C of infrastructure side device 150, terminal T41 and terminal T42 of switch SWP21 are connected, and terminal T44 and terminal T45 of switch SWM21 are connected. The switches SWP21 and SWM21 are controlled by, for example, the power conditioner 204.

  In the power conversion device 104, the control unit 14 outputs control signals to the switches SWP2, SWP3, SWP4 and the switches SWM2, SWM3, SWM4, so that the terminals T5 and T6 of the switch SWP2, the terminals T7 and T9 of the switch SWP3 are output. The terminals T11 and T12 of the switch SWP4, the terminals T25 and T26 of the switch SWM2, the terminals T27 and T29 of the switch SWM3, and the terminals T31 and T32 of the switch SWM4 are respectively connected.

  That is, switching circuits 82A and 52B electrically connect power supply nodes NP2 and NM2 and the input side of power transmission insulating circuit 54, and output side of power transmission insulating circuit 54 and DC external terminals TP2 and TM2. Are electrically connected.

  As a result, the DC power supplied from the load 202 via the power supply nodes NP2 and NM2 is output to the power transmission insulating circuit 54, and the power transmitted by the power transmission insulating circuit 54 is output to the power conditioner 204. .

  The power conditioner 204 boosts or steps down the DC power received from the power conversion device 104, converts it to AC power, and supplies the AC power to the AC power source 201.

  As described above, in the power conversion device according to the fourth embodiment of the present invention, the switching circuits 82A and 52B output the power boosted or stepped down by the step-up / down circuit 53 to the power transmission insulating circuit 54. In addition, the power transmitted by the power transmission insulating circuit 54 is output to the load 202 via the power supply nodes NP2 and NM2, or the DC power supplied from the load 202 via the power supply nodes NP2 and NM2 is output to the power transmission insulating circuit 54. Whether to output the power transmitted by the power transmission insulating circuit 54 to the power conditioner 204 is switched.

  That is, in the power conversion device according to the fourth embodiment of the present invention, bidirectional power conversion is performed without switching the step-up / down circuit 53 and the power transmission insulating circuit 54 by the switching circuits 82A and 52B. An apparatus can be realized.

  Therefore, the power conversion device according to the fourth embodiment of the present invention can perform bidirectional power conversion with a simple configuration.

  In the power conversion device according to the fourth embodiment of the present invention, the switching circuits 82A and 52B electrically connect the output side of the step-up / down circuit 53 and the input side of the power transmission insulating circuit 54, In addition, the output side of the power transmission insulating circuit 54 and the power supply nodes NP2 and NM2 are electrically connected, or the power supply nodes NP2 and NM2 and the input side of the power transmission insulating circuit 54 are electrically connected, and the power Whether to electrically connect the output side of the transmission insulating circuit 54 and the power conditioner 204 is switched.

  In this way, by changing the circuit connection by the switching circuits 82A and 52B, it is possible to realize a bidirectional power converter without making the step-up / step-down circuit 53 and the power transmission insulating circuit 54 bidirectional. It becomes.

  In the power conversion device according to the fourth embodiment of the present invention, switching circuits 82A and 52B include switches SWP2, SWP3 and SWP4 and switches SWM2, SWM3 and SWM4.

  In this way, by changing the circuit connection by switching the switches in the switching circuits 82A and 52B, the bidirectional power converter can be realized without making the step-up / down circuit 53 and the power transmission insulating circuit 54 bidirectional. It can be realized.

  Further, in the power conversion device according to the fourth embodiment of the present invention, in the operation of supplying power from the infrastructure (house) side to the vehicle side, the terminal T4 and terminal T5 of the switch SWP2, the terminal T7 and terminal of the switch SWP3 T8, terminal T10 and terminal T11 of switch SWP4, terminal T24 and terminal T25 of switch SWM2, terminal T27 and terminal T28 of switch SWM3, and terminal T30 and terminal T31 of switch SWM4 are connected to each other. Further, in the operation of supplying electric power from the automobile side to the infrastructure (house) side, the terminals T5 and T6 of the switch SWP2, the terminals T7 and T9 of the switch SWP3, the terminals T11 and T12 of the switch SWP4, and the terminal T25 of the switch SWM2 And a terminal T26, a terminal T27 and a terminal T29 of the switch SWM3, and a terminal T31 and a terminal T32 of the switch SWM4, respectively.

  By such switch control, a bidirectional power converter can be realized without making the step-up / step-down circuit 53 and the power transmission insulating circuit 54 bidirectional.

  Further, in the power conversion system according to the fourth embodiment of the present invention, power conversion device 104 converts AC power supplied from power supply nodes NP1 and NM1 into DC power and supplies it to power supply nodes NP2 and NM2. A first power conversion operation and a second power conversion operation for outputting DC power supplied from the power supply nodes NP2 and NM2 to the infrastructure side device 150 are performed. In the power conversion device 104, the switching circuits 82A and 52B output the power boosted or stepped down by the step-up / down circuit 53 to the power transmission insulating circuit 54, and the power transmitted by the power transmission insulating circuit 54 is a power supply node. Output to NP2 and NM2, or output DC power supplied from power supply nodes NP2 and NM2 to power transmission insulating circuit 54, and output power transmitted by power transmission insulating circuit 54 to infrastructure side device 150 Switch between. And the infrastructure side apparatus 150 converts the received direct-current power into alternating current power, and supplies it to power supply node NP1, NM1.

  With such a configuration, it is not necessary to provide an inverter circuit for converting DC power to AC power in the power converter 104, and it is sufficient to provide a rectifier circuit. Therefore, the power according to the first embodiment of the present invention Compared with the conversion device, the configuration can be simplified. Further, the power conditioner 204 for the photovoltaic power generation module 205 can be used as a step-up / step-down circuit for stepping up or stepping down DC power supplied from the load 202.

  In the power conversion system according to the fourth embodiment of the present invention, the switching circuit 72C outputs the DC power generated by the photovoltaic power generation module 205 to the infrastructure side device 150 or receives it from the power conversion device 103. Whether to output the direct current power to the infrastructure side device 150 is switched.

  With such a configuration, the power conditioner 204 for the photovoltaic power generation module 205 can be diverted as an inverter circuit for converting the DC power output from the power converter 104 to AC power. A conversion system can be constructed.

  Since other configurations and operations are the same as those of the power conversion device according to the third embodiment, detailed description thereof will not be repeated here.

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Fifth embodiment>
The present embodiment relates to a power conversion device that is provided with an inverter circuit outside as compared with the power conversion device according to the second embodiment and uses the boosting function or the step-down function of the inverter circuit. The contents other than those described below are the same as those of the power conversion device according to the second embodiment and the power conversion system according to the fourth embodiment.

  FIG. 15 is a diagram showing a configuration of a power conversion system according to the fifth embodiment of the present invention.

  Referring to FIG. 15, a power conversion system 303 includes a power conversion device 105, an infrastructure device 150, an AC power supply 201, a battery 202, a solar power generation module 205, AC external terminals TP1 and TM1, and a DC. External terminals TP2 and TM2 are provided.

  The power conversion device 105 includes a rectifier circuit 61, switching circuits 62 </ b> A, 62 </ b> B, 62 </ b> C, a step-up / down circuit 53, a power transmission insulating circuit 64, and a control unit 14. The rectifier circuit 61 includes diodes D1 to D4. The switching circuit 62C includes a switch SWP31 and a switch SWM31.

  The step-up / down circuit 53 includes a positive side node NP10, a negative side node NM10 electrically connected to the rectifier circuit 61, and a positive side node NP11 and a negative side node NM11 electrically connected to the switching circuit 62C. The power conditioner 204 has a positive side node NP21 and a negative side node NM21.

  In the switching circuit 62C, the switch SWP31 is electrically connected to the terminal T21 electrically connected to the negative node NM11 of the step-up / down circuit 53, the terminal T22 connected to the terminal T1 of the switch SWP11, and the DC external terminal TP2. And a connected terminal T23. The switch SWM31 has a terminal T24 electrically connected to the positive side node NP11 of the step-up / down circuit 53, a terminal T25 connected to the terminal T7 of the switch SWM11, and a terminal T26 electrically connected to the DC external terminal TM2. And have.

  In the switching circuit 62A, the switch SWP11 includes a terminal T1 connected to the terminal T22 of the switch SWP31, and a terminal T2 electrically connected to the first end of the capacitor C0 of the power transmission insulating circuit 64, that is, the positive side node NP12. And a second end of the capacitor C0 of the power transmission insulating circuit 64, that is, a terminal T3 electrically connected to the negative node NM12. The switch SWM11 is electrically connected to the terminal T7 connected to the terminal T25 of the switch SWM31, the terminal T8 connected to the negative node NM12 of the power transmission insulating circuit 64, and the positive node NP12 of the power transmission insulating circuit 64. And a terminal T9 connected to the.

  The switching circuit 62A switches the polarity of electrical connection between the nodes NP11 and NM11 of the step-up / down circuit 53 and the nodes NP12 and NM12 of the power transmission insulating circuit 64.

  The switching circuit 62B switches the polarity of the electrical connection between the nodes NP13 and NM13 of the power transmission insulating circuit 64 and the power supply nodes NP2 and NM2.

  In the switching circuit 72C of the infrastructure side device 150, the switch SWP21 includes a terminal T41 electrically connected to the negative side node NM21 of the power conditioner 204, a terminal T42 electrically connected to the DC external terminal TP12, And a terminal T43 electrically connected to the photovoltaic module 205. The switch SWM21 is electrically connected to the terminal T44 electrically connected to the positive side node NP21 of the power conditioner 204, the terminal T45 electrically connected to the DC external terminal TM12, and the photovoltaic power generation module 205. Terminal T46.

[Operation]
Next, an operation when the power conversion device according to the fifth embodiment of the present invention performs bidirectional power conversion will be described with reference to the drawings.

  FIG. 16: is a figure which shows the operation | movement in which the power converter device which concerns on the 5th Embodiment of this invention supplies electric power from the infrastructure (house) side to the motor vehicle side. The dotted arrows in FIG. 16 indicate the flow of current.

  Referring to FIG. 16, for example, in switching circuit 72C of infrastructure side device 150, terminal T41 and terminal T43 of switch SWP21 are connected, and terminal T44 and terminal T46 of switch SWM21 are connected. The switches SWP21 and SWM21 are controlled by, for example, the power conditioner 204.

  Thereby, the DC power generated by the photovoltaic power generation module 205 is output to the power conditioner 204.

  In the power conversion device 105, the control unit 14 outputs control signals to the switches SWP11 and SWP12 and the switches SWM11 and SWM12, whereby the terminals T1 and T3 of the switch SWP11, the terminals T4 and T5 of the switch SWP12, and the switches SWM11 Terminals T7 and T9 are connected to terminals T10 and T11 of switch SWP12, respectively. Further, the control unit 14 outputs a control signal to the switch SWP31 and the switch SWM31, thereby connecting the terminal T21 and the terminal T22 of the switch SWP31 and the terminal T24 and the terminal T25 of the switch SWM31, respectively.

  That is, the switching circuit 62C outputs the power boosted or stepped down by the step-up / down circuit 53 to the switching circuit 62A.

  The switching circuit 62A connects the positive node NP11 of the buck-boost circuit 53 and the positive node NP12 of the power transmission insulating circuit 64, and the negative node NM11 of the buck-boost circuit 53 and the negative of the power transmission insulating circuit 64. The side node NM12 is connected. The switching circuit 62B connects the positive node NP13 and the positive power supply node NP2 of the power transmission insulating circuit 64, and connects the negative node NM13 and the negative power supply node NM2 of the power transmission insulating circuit 64.

  As a result, the power boosted or stepped down by the step-up / down circuit 53 is output to the power transmission insulating circuit 64, and this DC power is supplied to the load 202 by the power transmission insulating circuit 64 via the power supply nodes NP2 and NM2.

  Here, for example, the infrastructure side device 150 monitors the presence or absence of electrical connection with the power conversion device 105 and, when detecting the electrical connection, instructs the control unit 14 in the power conversion device 105 to start the first power conversion operation. Instruct. For example, the power conditioner 204 in the infrastructure device 150 instructs the control unit 14 to start the first power conversion operation by wired communication or wireless communication.

  In response to this instruction, the control unit 14 controls the switching circuits 62A, 62B, and 62C as described above, so that the first power conversion operation of the power conversion device 105, that is, from the infrastructure (house) side to the vehicle side. The power supply operation is started.

  With such a configuration, it is possible to automatically recognize that the power conversion device 105 is connected to the infrastructure side device 150 and appropriately start power supply to the load 202.

  FIG. 17 is a diagram illustrating an operation in which the power conversion device according to the fifth embodiment of the present invention supplies power from the automobile side to the infrastructure (house) side. The dotted arrows in FIG. 17 indicate the flow of current.

  Referring to FIG. 17, in switching circuit 72C of infrastructure side device 150, terminal T41 and terminal T42 of switch SWP21 are connected, and terminal T44 and terminal T45 of switch SWM21 are connected. The switches SWP21 and SWM21 are controlled by, for example, the power conditioner 204.

  In the power conversion device 105, the control unit 14 outputs control signals to the switches SWP11 and SWP12 and the switches SWM11 and SWM12, so that the terminals T1 and T2 of the switch SWP11, the terminals T4 and T6 of the switch SWP12, and the switches SWM11 Terminals T7 and T8 are connected to terminals T10 and T12 of switch SWP12, respectively. Further, the control unit 14 outputs a control signal to the switch SWP31 and the switch SWM31, thereby connecting the terminal T22 and the terminal T23 of the switch SWP31 and the terminal T25 and the terminal T26 of the switch SWM31, respectively.

  That is, the switching circuit 62C outputs the DC power transmitted from the power transmission insulating circuit 64 via the switching circuit 62A to the power conditioner 204.

  The switching circuit 62A connects the positive side node NP21 of the power conditioner 204 and the negative side node NM12 of the power transmission insulating circuit 64, and the positive side node NM21 of the power conditioner 204 and the positive side of the power transmission insulating circuit 64. The side node NP12 is connected. The switching circuit 62B connects the positive node NP13 and the negative power supply node NM2 of the power transmission insulating circuit 64, and connects the negative node NM13 and the positive power supply node NP2 of the power transmission insulating circuit 64.

  As a result, DC power is supplied from the load 202 to the power transmission insulating circuit 64 via the power supply nodes NP2 and NM2, and this power is transmitted to the power conditioner 204 by the power transmission insulating circuit 64. The voltage is stepped up or down by the conditioner 204, converted into AC power, and supplied to the AC power supply 201.

  In addition, the infrastructure device 150 monitors the amount of power stored in the load 202, which is a storage battery, for example, when the power conversion device 105 is performing the second power conversion operation, that is, the power supply operation from the vehicle side to the infrastructure (house) side. To do. And the infrastructure side apparatus 150 will instruct | indicate the stop of 2nd power conversion operation | movement to the control part 14 in the power converter device 105, when the amount of electrical storage becomes below a predetermined value.

  And the control part 14 stops the 2nd power conversion operation | movement of the power converter device 105 by receiving this instruction | indication and controlling each switch in switching circuit 62A, 62B, 62C to an open state.

  Furthermore, the infrastructure side apparatus 150 outputs the DC power generated by the photovoltaic power generation module 205 to the infrastructure side apparatus 150 by controlling the switching circuit 72C.

  For example, the control unit 14 in the power conversion device 105 monitors the charge amount of the load 202 that is a storage battery, and periodically notifies the charge amount to the power conditioner 204 in the infrastructure side device 150 by wired communication or wireless communication. Then, the power conditioner 204 controls the switching circuit 72C based on the notified charge amount, and controls the switching circuits 62A, 62B, and 62C via the control unit 14.

  With such a configuration, the charge amount of the load 202 that is a storage battery can be automatically monitored, and the charging source of the AC power supply 201 can be appropriately switched.

  As described above, in the power conversion device according to the fifth embodiment of the present invention, the switching circuit 62C outputs the power boosted or stepped down by the step-up / down circuit 53 to the switching circuit 62A or via the switching circuit 62A. To switch whether to output the DC power transmitted from the power transmission insulating circuit 64 to the power conditioner 204. The switching circuit 62A switches the polarity of the electrical connection between the nodes NP11 and NM11 of the step-up / step-down circuit 53 and the nodes NP12 and NM12 of the power transmission insulating circuit 64. The switching circuit 62B switches the polarity of the electrical connection between the nodes NP13 and NM13 of the power transmission insulating circuit 64 and the power supply nodes NP2 and NM2.

  That is, in the power conversion device according to the fifth embodiment of the present invention, the step-up / down circuit 53 and the power transmission insulating circuit 64 are made bidirectional by changing the circuit connection by the switching circuits 62A, 62B, and 62C. Thus, a bidirectional power conversion device can be realized.

  Therefore, the power conversion device according to the fifth embodiment of the present invention can perform bidirectional power conversion with a simple configuration.

  In the power conversion device according to the fifth embodiment of the present invention, switching circuits 62A and 62B include switches SWP11 and SWP12 and switches SWM11 and SWM12. The switching circuit 62C includes switches SWP31 and SWM31.

  In this way, by changing the circuit connection by switching each switch in the switching circuits 62A, 62B, 62C, bidirectional power conversion is achieved without making the step-up / down circuit 53 and the power transmission insulating circuit 64 bidirectional. An apparatus can be realized.

  Further, in the power conversion device according to the fifth embodiment of the present invention, in the operation of supplying power from the infrastructure (house) side to the vehicle side, the terminal T1 and terminal T3 of the switch SWP11, the terminal T4 and terminal of the switch SWP12 T5, terminal T7 and terminal T9 of switch SWM11, terminal T10 and terminal T11 of switch SWP12 are respectively connected, terminal T21 and terminal T22 of switch SWP31, and terminal T24 and terminal T25 of switch SWM31 are respectively connected. Further, in the operation of supplying electric power from the automobile side to the infrastructure (house) side, the terminals T1 and T2 of the switch SWP11, the terminals T4 and T6 of the switch SWP12, the terminals T7 and T8 of the switch SWM11, and the terminal T10 of the switch SWP12. And the terminal T12 are connected to each other, and the terminals T22 and T23 of the switch SWP31 and the terminals T25 and T26 of the switch SWM31 are connected to each other.

  By such switch control, it is possible to realize a bidirectional power converter without making the step-up / step-down circuit 53 and the power transmission insulating circuit 64 bidirectional.

  Moreover, in the power converter device according to the fifth embodiment of the present invention, the DC power is output to the AC external terminals TP1 and TM1 for receiving the AC power supplied from the power supply nodes NP1 and NM1 and the power conditioner 204. DC external terminals TP2 and TM2 are provided.

  Thus, in addition to the terminal for AC power supply 201, the structure provided with the terminal for power conditioner 204 makes it possible to secure a DC power supply path from power converter 105 to infrastructure apparatus 150. .

  In the power conversion system according to the fifth embodiment of the present invention, power conversion device 105 converts AC power supplied from power supply nodes NP1 and NM1 into DC power and supplies the power to power supply nodes NP2 and NM2. A first power conversion operation and a second power conversion operation for outputting DC power supplied from the power supply nodes NP2 and NM2 to the infrastructure side device 150 are performed. The switching circuit 62C in the power converter 105 outputs the power boosted or stepped down by the step-up / down circuit 53 to the switching circuit 62A, or the direct current power transmitted from the power transmission insulating circuit 64 via the switching circuit 62A is the infrastructure side. Whether to output to the device 150 is switched. And the infrastructure side apparatus 150 converts the received direct-current power into alternating current power, and supplies it to power supply node NP1, NM1.

  With such a configuration, it is not necessary to provide an inverter circuit for converting DC power to AC power in the power converter 105, and it is sufficient to provide a rectifier circuit. Therefore, the power according to the second embodiment of the present invention Compared with the conversion device, the configuration can be simplified. Further, the power conditioner 204 for the photovoltaic power generation module 205 can be used as a step-up / step-down circuit for stepping up or stepping down DC power supplied from the load 202.

  In the power conversion system according to the fifth embodiment of the present invention, the switching circuit 72C outputs the DC power generated by the photovoltaic power generation module 205 to the infrastructure side device 150 or receives it from the power conversion device 103. Whether to output the direct current power to the infrastructure side device 150 is switched.

  With such a configuration, the power conditioner 204 for the photovoltaic power generation module 205 can be diverted as an inverter circuit for converting DC power output from the power converter 105 into AC power. A conversion system can be constructed.

  Since other configurations and operations are the same as those of the power conversion device according to the second embodiment and the power conversion system according to the fourth embodiment, detailed description thereof will not be repeated here.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 14 Control part 21 Input switch part 22 Output switch part 51 Rectifier / inverter circuit 52A, 52B, 62A, 62B, 62C, 72A, 72C, 82A Switching circuit 53, 63 Buck-boost circuit 54, 64 Power transmission insulation circuit 61 Rectifier circuit 101-105 Power conversion device 150 Infrastructure side device 201 AC power source 202 Load 204 Power conditioner (inverter circuit)
205 PV module 301, 302, 303 Power conversion system TR1 to TR4, TR11, TR21, TR22, TR23, TR24 Transistors D1 to D12, D15 Diodes SWP1, SWP2, SWM1, SWM2, SWP3, SWP4, SWM3, SWM4, SWP21 , SWM21, SWP31, SWM31 Switch C0 to C2, C11, C12 Capacitor L11 Inductor TP1, TM1, TP11, TM11 AC external terminal TP2, TM2, TP12, TM12 DC external terminal

Claims (33)

An inverter circuit for converting the received DC power into AC power and supplying it to the first power supply node is provided inside or outside, and the AC power supplied from the first power supply node is converted into DC power to be converted into the second power. A power conversion device for performing a first power conversion operation for supplying power to a power supply node and a second power conversion operation for outputting DC power supplied from the second power supply node to the inverter circuit,
A rectifier circuit for rectifying AC power supplied from the first power supply node;
A step-up / step-down circuit for boosting or stepping down the received power and outputting it;
An insulation circuit for power transmission for transmitting power received from the step-up / down circuit while insulating between the input side and the output side;
The AC power rectified by the rectifier circuit is output to the step-up / down circuit, and the power transmitted by the power transmission insulating circuit is output to the second power supply node or supplied from the second power supply node. And a switching circuit for switching whether to output DC power to the inverter circuit via the power transmission insulating circuit. The power conversion device further includes:
As the rectifier circuit and the inverter circuit, an operation of rectifying AC power supplied from the first power supply node and an operation of converting the received DC power into AC power and supplying the AC power to the first power supply node are performed. With possible rectifier / inverter circuit,
The switching circuit outputs the AC power rectified by the rectification / inverter circuit to the step-up / down circuit and outputs the power transmitted by the power transmission insulating circuit to the second power supply node, or 2. The power according to claim 1, wherein DC power supplied from two power supply nodes is output to the step-up / down circuit and the power transmitted by the power transmission insulating circuit is switched to the rectifier / inverter circuit. Conversion device.   Whether the switching circuit electrically connects the rectification / inverter circuit and the input side of the step-up / down circuit, and electrically connects the output side of the power transmission insulating circuit and the second power supply node. Switching between electrically connecting the second power supply node and the input side of the buck-boost circuit and electrically connecting the output side of the power transmission insulating circuit and the rectifier / inverter circuit. Item 3. The power conversion device according to Item 2. The switching circuit is
A first switch having a first terminal electrically connected to the rectifier / inverter circuit, a second terminal, and a third terminal;
A second switch having a first terminal electrically connected to a second terminal of the first switch, a second terminal electrically connected to an input side of the step-up / down circuit, and a third terminal When,
A third terminal having a first terminal electrically connected to the output side of the power transmission insulating circuit, a second terminal, and a third terminal electrically connected to the third terminal of the first switch. And the switch
Electrically connected to a first terminal electrically connected to a second terminal of the third switch, a second terminal electrically connected to the second power supply node, and a third terminal of the second switch The power converter of Claim 3 containing the 4th switch which has the 3rd terminal connected to.   In the first power conversion operation, the first terminal and the second terminal of each of the first switch to the fourth switch are connected, and in the second power conversion operation, the first switch and the third switch are connected. 5. The power conversion according to claim 4, wherein a first terminal and a third terminal of each of the switches are connected, and a second terminal and a third terminal of each of the second switch and the fourth switch are connected. apparatus. The inverter circuit is provided outside the power converter,
The switching circuit outputs the AC power rectified by the rectifier circuit to the step-up / down circuit and outputs the power transmitted by the power transmission insulating circuit to the second power supply node or the second power supply. The power conversion device according to claim 1, wherein switching between whether to output DC power supplied from a node to the step-up / down circuit and to output power transmitted by the power transmission insulating circuit to the inverter circuit is performed.   The switching circuit electrically connects the rectifier circuit and the input side of the step-up / down circuit, and electrically connects the output side of the power transmission insulating circuit and the second power supply node, or The second power supply node and the input side of the step-up / down circuit are electrically connected, and the output side of the power transmission insulating circuit and the inverter circuit are switched electrically. Power converter. The switching circuit is
A first switch having a first terminal electrically connected to the rectifier circuit, a second terminal electrically connected to an input side of the buck-boost circuit, and a third terminal;
A second switch having a first terminal electrically connected to the output side of the power transmission insulating circuit, a second terminal, and a third terminal electrically connected to the inverter circuit;
Electrically connected to a first terminal electrically connected to a second terminal of the second switch, a second terminal electrically connected to the second power supply node, and a third terminal of the first switch The power converter of Claim 7 containing the 3rd switch which has a 3rd terminal connected to.   In the first power conversion operation, the first terminal and the second terminal of each of the first switch to the third switch are connected, and in the second power conversion operation, the first switch and the third switch are connected. The power conversion device according to claim 8, wherein a second terminal and a third terminal of each of the switches are connected, and a first terminal and a third terminal of the second switch are connected. An inverter circuit for boosting the received DC power and converting it to AC power and supplying it to the first power supply node is provided outside, and the AC power supplied from the first power supply node is converted to DC power and converted into DC power. A power conversion device for performing a first power conversion operation for supplying power to two power supply nodes and a second power conversion operation for outputting DC power supplied from the second power supply node to the inverter circuit;
A rectifier circuit for rectifying and outputting AC power supplied from the first power supply node;
A step-up / step-down circuit for boosting or stepping down the power received from the rectifier circuit;
An insulation circuit for power transmission for transmitting received power while insulating between the input side and the output side;
The power boosted or stepped down by the step-up / down circuit is output to the power transmission insulating circuit, and the power transmitted by the power transmission insulating circuit is output to the second power supply node, or the second power supply node And a switching circuit for switching whether to output the DC power supplied from the power transmission insulating circuit to the inverter circuit and to output the power transmitted by the power transmission insulating circuit to the inverter circuit. .   The switching circuit electrically connects the output side of the step-up / down circuit and the input side of the power transmission insulating circuit, and electrically connects the output side of the power transmission insulating circuit and the second power supply node. Or the second power supply node is electrically connected to the input side of the power transmission insulating circuit, and the output side of the power transmission insulating circuit is electrically connected to the inverter circuit. The power converter according to claim 10 which switches. The switching circuit is
A first switch having a first terminal electrically connected to the output side of the step-up / down circuit, a second terminal electrically connected to the input side of the power transmission insulating circuit, and a third terminal When,
A second switch having a first terminal electrically connected to the output side of the power transmission insulating circuit, a second terminal, and a third terminal electrically connected to the inverter circuit;
Electrically connected to a first terminal electrically connected to a second terminal of the second switch, a second terminal electrically connected to the second power supply node, and a third terminal of the first switch The power converter of Claim 11 containing the 3rd switch which has a 3rd terminal connected to.   In the first power conversion operation, the first terminal and the second terminal of each of the first switch to the third switch are connected, and in the second power conversion operation, the first switch and the third switch are connected. The power conversion device according to claim 12, wherein a second terminal and a third terminal of each of the switches are connected, and a first terminal and a third terminal of the second switch are connected. The power transmission insulating circuit is:
A first power storage element having a first end and a second end;
A second power storage element having a first end and a second end;
A third power storage element having a first end and a second end;
A first switch element connected between a first end of the first power storage element and a first end of the second power storage element; a second end of the first power storage element; and the second power storage. A second switch element connected between the second end of the element, and the power received at the first end of the first switch element and the first end of the second switch element is the second switch element. An input switch unit for supplying power to the storage element;
A third switch element connected between a first end of the second power storage element and a first end of the third power storage element, and a second end of the second power storage element and the third power storage Including a fourth switch element connected between the second end of the element, and including an output switch unit for supplying power stored in the second power storage element to the third power storage element, The power converter of any one of Claim 1 to 13. An inverter circuit for converting the received DC power into AC power and supplying it to the first power supply node is provided inside or outside, and the AC power supplied from the first power supply node is converted into DC power to be converted into the second power. A power conversion device for performing a first power conversion operation for supplying power to a power supply node and a second power conversion operation for outputting DC power supplied from the second power supply node to the inverter circuit,
A rectifier circuit for rectifying AC power supplied from the first power supply node;
A step-up / step-down circuit electrically connected to the rectifier circuit for boosting or stepping down received power;
A first node electrically connected to the step-up / step-down circuit; and a second node electrically connected to the second power supply node, while insulating between the first node and the second node. An insulating circuit for power transmission for transmitting power between the first node and the second node;
A first switching circuit for switching a polarity of an electrical connection between the step-up / step-down circuit and a first node of the power transmission insulating circuit;
A power conversion device comprising: a second switching circuit for switching a polarity of an electrical connection between the second node of the power transmission insulating circuit and the second power supply node. The power conversion device further includes:
As the rectifier circuit and the inverter circuit, an operation of rectifying AC power supplied from the first power supply node and an operation of converting the received DC power into AC power and supplying the AC power to the first power supply node are performed. The power conversion device according to claim 15, comprising a possible rectification / inverter circuit.   The step-up / down circuit has a first node electrically connected to the rectifier / inverter circuit and a second node electrically connected to the first switching circuit, and the electric power received at the first node The operation of boosting or stepping down the voltage and outputting from the second node and the operation of boosting or stepping down the power received at the second node and outputting from the first node are possible. The power converter described. The second node of the step-up / step-down circuit includes a positive side node and a negative side node, and each of the first node and the second node of the power transmission insulating circuit includes a positive side node and a negative side node, and the second power source The node includes a positive node and a negative node,
The first switching circuit includes:
A first terminal connected to a positive side node of the second node of the step-up / down circuit; a second terminal connected to a positive side node of the first node of the power transmission insulating circuit; A first switch having a third terminal connected to the negative node of the first node of the isolation circuit;
A first terminal connected to the negative node of the second node of the buck-boost circuit; a second terminal connected to the negative node of the first node of the power transmission insulating circuit; A second switch having a third terminal connected to the positive node of the first node of the isolation circuit;
The second switching circuit includes:
A first terminal connected to a positive side node of the second node of the power transmission insulating circuit; a second terminal connected to a positive side node of the second power supply node; and a negative side of the second power supply node. A third switch having a third terminal connected to the node;
A first terminal connected to a negative node of the second node of the insulating circuit for power transmission; a second terminal connected to a negative node of the second power supply node; and a positive side of the second power supply node The power conversion device according to claim 17, further comprising: a fourth switch having a third terminal connected to the node.   In the first power conversion operation and the second power conversion operation, the first terminal and the second terminal of each of the first switch to the fourth switch are connected, and the first switch to the The power conversion device according to claim 18, wherein a state in which the first terminal and the third terminal of each of the fourth switches are connected is switched. The inverter circuit is provided outside the power converter,
The power conversion device further includes:
The power boosted or stepped down by the step-up / down circuit is output to the first switching circuit, or the DC power transmitted from the power transmission insulating circuit via the first switching circuit is output to the inverter circuit. The power conversion device according to claim 15, further comprising a third switching circuit for switching between the two. The second node of the step-up / step-down circuit includes a positive side node and a negative side node, and each of the first node and the second node of the power transmission insulating circuit includes a positive side node and a negative side node, and the second power source The node includes a positive node and a negative node, and the inverter circuit includes a positive node and a negative node,
The first switching circuit includes:
A first terminal; a second terminal connected to a positive node of the first node of the power transmission insulating circuit; and a third terminal connected to a negative node of the first node of the power transmission insulating circuit. A first switch having a terminal;
A first terminal; a second terminal connected to the negative node of the first node of the power transmission insulating circuit; and a third terminal connected to the positive node of the first node of the power transmission insulating circuit. A second switch having a terminal,
The second switching circuit includes:
A first terminal connected to a positive side node of the second node of the power transmission insulating circuit; a second terminal connected to a positive side node of the second power supply node; and a negative side of the second power supply node. A third switch having a third terminal connected to the node;
A first terminal connected to a negative node of the second node of the insulating circuit for power transmission; a second terminal connected to a negative node of the second power supply node; and a positive side of the second power supply node A fourth switch having a third terminal connected to the node;
The third switching circuit includes:
A first terminal connected to the positive node of the second node of the step-up / down circuit, a second terminal connected to the first terminal of the first switch, and a negative node of the inverter circuit. A fifth switch having a third terminal;
A first terminal connected to the negative node of the second node of the step-up / down circuit, a second terminal connected to the first terminal of the second switch, and a positive node of the inverter circuit. The power conversion device according to claim 20, further comprising: a sixth switch having a third terminal.   In the first power conversion operation and the second power conversion operation, the first terminal and the second terminal of each of the first switch to the sixth switch are connected, and the first switch to the The first terminal and the third terminal of each of the fourth switches are connected, and the state where the second terminal and the third terminal of the fifth switch and the sixth switch are connected is switched. The power converter according to 21. The power conversion device further includes:
An AC external terminal for receiving AC power supplied from the first power supply node;
The power converter according to any one of claims 6 to 13 and 20 to 22, further comprising a DC external terminal for outputting DC power to the inverter circuit. The power transmission insulating circuit is:
A first power storage element having a first end and a second end as the first node;
A second power storage element having a first end and a second end;
A third power storage element having a first end and a second end as the second node;
A first switch element connected between a first end of the first power storage element and a first end of the second power storage element; a second end of the first power storage element; and the second power storage. A first power transfer switch unit including a second switch element connected between the second end of the element and transmitting power between the first node and the second power storage element;
A third switch element connected between a first end of the second power storage element and a first end of the third power storage element, and a second end of the second power storage element and the third power storage A fourth switch element connected between the second end of the element, and a second power transfer switch unit for transmitting power between the second power storage element and the second node, The power converter according to any one of claims 15 to 23. A first power conversion device for converting the received DC power into AC power and supplying it to the first power supply node;
A first power conversion operation for converting AC power supplied from the first power supply node into DC power and supplying the power to a second power supply node, and DC power supplied from the second power supply node as the first power conversion A second power conversion device for performing a second power conversion operation to output to the device,
The second power converter is
A rectifier circuit for rectifying AC power supplied from the first power supply node;
A step-up / step-down circuit for boosting or stepping down the received power and outputting it;
An insulation circuit for power transmission for transmitting power received from the step-up / down circuit while insulating between the input side and the output side;
The AC power rectified by the rectifier circuit is output to the step-up / down circuit, and the power transmitted by the power transmission insulating circuit is output to the second power supply node or supplied from the second power supply node. A first switching circuit for switching whether to output DC power to the step-up / step-down circuit and to output power transmitted by the power transmission insulating circuit to the first power converter. system. A first power conversion device for converting the received DC power into AC power and supplying it to the first power supply node;
A first power conversion operation for converting AC power supplied from the first power supply node into DC power and supplying the power to a second power supply node, and DC power supplied from the second power supply node as the first power conversion A second power conversion device for performing a second power conversion operation to output to the device,
The second power converter is
A rectifier circuit for rectifying and outputting AC power supplied from the first power supply node;
A step-up / step-down circuit for boosting or stepping down the power received from the rectifier circuit;
An insulation circuit for power transmission for transmitting received power while insulating between the input side and the output side;
The power boosted or stepped down by the step-up / down circuit is output to the power transmission insulating circuit, and the power transmitted by the power transmission insulating circuit is output to the second power supply node, or the second power supply node A first switching circuit for switching whether to output the DC power supplied from the power transmission insulating circuit to the power transmission insulating circuit and to output the power transmitted by the power transmission insulating circuit to the first power converter Including power conversion system. The power conversion system further includes:
A power generator for generating direct current power;
For switching whether to output the DC power generated by the power generator to the first power converter or to output the DC power received from the second power converter to the first power converter. 27. The power conversion system according to claim 25 or 26, comprising a second switching circuit. A storage battery is connected to the second power supply node,
The first power conversion device monitors a storage amount of the storage battery in a state where the second power conversion device performs the second power conversion operation, and when the storage amount becomes a predetermined value or less, By controlling the first switching circuit in the second power conversion device, the second power conversion operation of the second power conversion device is stopped, and further, by controlling the second switching circuit. The power conversion system according to claim 27, wherein DC power generated by the power generation device is output to the first power conversion device.   The first power conversion device monitors the presence or absence of an electrical connection with the second power conversion device. When the first power conversion device detects the electrical connection, the first power conversion device switches the first switching circuit in the second power conversion device. The power conversion system according to any one of claims 25 to 28, wherein the first power conversion operation of the second power conversion device is started by controlling. A first power conversion device for converting the received DC power into AC power and supplying it to the first power supply node;
A first power conversion operation for converting AC power supplied from the first power supply node into DC power and supplying the power to a second power supply node, and DC power supplied from the second power supply node as the first power conversion A second power conversion device for performing a second power conversion operation to output to the device,
The second power converter is
A rectifier circuit for rectifying AC power supplied from the first power supply node;
A step-up / step-down circuit electrically connected to the rectifier circuit for boosting or stepping down received power;
A first node electrically connected to the step-up / step-down circuit; and a second node electrically connected to the second power supply node, while insulating between the first node and the second node. An insulating circuit for power transmission for transmitting power between the first node and the second node;
A first switching circuit for switching a polarity of an electrical connection between the step-up / step-down circuit and a first node of the power transmission insulating circuit;
A second switching circuit for switching the polarity of the electrical connection between the second node of the insulating circuit for power transmission and the second power supply node;
The power boosted or stepped down by the step-up / down circuit is output to the first switching circuit, or the DC power transmitted from the power transmission insulating circuit via the first switching circuit is converted to the first power conversion. And a third switching circuit for switching whether to output to the device. The power conversion system further includes:
A power generator for generating direct current power;
For switching whether to output the DC power generated by the power generator to the first power converter or to output the DC power received from the second power converter to the first power converter. The power conversion system according to claim 30, comprising a fourth switching circuit. A storage battery is connected to the second power supply node,
The first power conversion device monitors a storage amount of the storage battery in a state where the second power conversion device performs the second power conversion operation, and when the storage amount becomes a predetermined value or less, By controlling the first switching circuit to the third switching circuit in the second power converter, the second power conversion operation of the second power converter is stopped, and further, the fourth power converter 32. The power conversion system according to claim 31, wherein a DC power generated by the power generation device is output to the first power conversion device by controlling a switching circuit. The first power conversion device monitors the presence or absence of an electrical connection with the second power conversion device, and detects the electrical connection, the first switching circuit or the second switching circuit in the second power conversion device. The power conversion system according to any one of claims 30 to 32, wherein the first power conversion operation of the second power conversion device is started by controlling the third switching circuit.

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