CN109818503A - DC-DC converter and DC-DC converter control method - Google Patents
DC-DC converter and DC-DC converter control method Download PDFInfo
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Abstract
本发明提供了一种直流‑直流变换器及直流‑直流变换器控制方法，其中，该直流‑直流变换器包括：第一功率变换单元、第二功率变换单元、第一切换单元、第二切换单元和输出滤波单元。采用上述技术方案，解决了相关技术中开关电源功率电路拓扑的电压增益调节能力较差的问题，提高了开关电源功率电路拓扑的电压增益调节能力。
The present invention provides a DC-DC converter and a control method for the DC-DC converter, wherein the DC-DC converter includes: a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit unit and output filtering unit. The above technical solution solves the problem of poor voltage gain adjustment capability of the switching power supply power circuit topology in the related art, and improves the voltage gain adjustment capability of the switching power supply power circuit topology.
Description
Technical Field
The invention relates to the field of communication, in particular to a direct current-direct current converter and a direct current-direct current converter control method.
Background
With the development of modern power electronic technology and power switch device technology, the application of the switching power supply is more and more extensive, the use scenes are more and more diversified, some use scenes need the switching power supply to have a very wide output voltage range, and how to increase the output voltage range of the switching power supply becomes a problem which must be faced and solved.
The input end of a direct current-direct current (DC/DC) part in the current switching Power supply Power circuit topology is mostly fixed value bus voltage provided by a Power Factor Corrector (PFC for short) at a preceding stage, and for the fixed input voltage, if a wide voltage range is required to be output, the circuit topology is required to have wide voltage gain adjustment capability, but the existing Power circuit topology is difficult to realize wide-range output. The existing solutions mainly include two types, the first type is to adjust the input side bus voltage, when the output voltage is higher, the input bus voltage is increased, and when the output voltage is lower, the input bus voltage is reduced. The second scheme is a control method for adjusting a primary circuit, which realizes gain adjustment by switching a half-bridge circuit and a full-bridge circuit, but the scheme only realizes the range of gain, but cannot solve the problem of overlarge current stress during low-voltage output in some occasions with constant power application requirements.
Aiming at the problem of poor voltage gain adjustment capability of a switching power supply power circuit topology in the related art, no effective solution is provided at present.
Disclosure of Invention
The embodiment of the invention provides a direct current-direct current converter and a direct current-direct current converter control method, which are used for at least solving the problem of poor voltage gain adjustment capability of a switching power supply power circuit topology in the related art.
According to an embodiment of the present invention, there is provided a dc-dc converter including: the power conversion circuit comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit and an output filtering unit, wherein the first power conversion unit is used for performing power conversion on a first input voltage to obtain a first output voltage, and the second power conversion unit is used for performing power conversion on a second input voltage to obtain a second output voltage; a first port of a negative electrode of the first power conversion unit, which is used for outputting the first output voltage, is connected with the second switching unit, and a second port of a positive electrode of the second power conversion unit, which is used for outputting the second output voltage, is connected with the first switching unit; the first switching unit and the second switching unit are connected in series and then connected between a third port of a positive pole of the first power conversion unit for outputting the first output voltage and a fourth port of a negative pole of the second power conversion unit for outputting the second output voltage; the output filtering unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor is connected with the first switching unit in parallel, and the second capacitor is connected with the second switching unit in parallel; the third port and the fourth port are respectively connected with the output filter unit to form the output voltage of the DC-DC converter.
Optionally, the first switching unit comprises: a first switch and a second switch, the second switching unit including: a third switch and a fourth switch, wherein the first switch, the second switch, the third switch and the fourth switch are connected in series, the first switch is further connected with the third port, and the fourth switch is further connected with the fourth port; the first port is connected between the third switch and the fourth switch, and the second port is connected between the first switch and the second switch.
Optionally, the first switch and the fourth switch are each a switching device of one of: a diode, a fully-controlled semiconductor switching device, a semi-controlled semiconductor switching device; the second switch and the third switch are all fully-controlled semiconductor switch devices.
Optionally, in a case that the first switch and the fourth switch are all fully-controlled semiconductor switching devices, a source of the first switch is connected to a drain of the second switch, a drain of the first switch is connected to the third port, and a source of the first switch is also connected to the second port; the source electrode of the third switch is connected with the drain electrode of the fourth switch, the source electrode of the fourth switch is connected with the fourth port, and the source electrode of the third switch is further connected with the first port.
Optionally, in a case that the first switch and the fourth switch are both diodes, an anode of the first switch is connected to a drain of the second switch, a cathode of the first switch is connected to the third port, and an anode of the first switch is further connected to the second port; the source electrode of the third switch is connected with the negative electrode of the fourth switch, the positive electrode of the fourth switch is connected with the fourth port, and the source electrode of the third switch is also connected with the first port.
Optionally, the first power conversion unit and the second power conversion unit are both a resonant conversion circuit or a PWM converter.
Optionally, the topology of the resonant conversion circuit comprises one of: half-bridge, half-bridge with diode clamping, full-bridge; the secondary side rectifying circuit of the resonance conversion circuit comprises one of the following components: full-bridge rectifier circuit, full-wave rectifier circuit.
According to another embodiment of the present invention, there is provided a control method of a dc-dc converter including: inputting a first driving voltage to the first switching unit and the second switching unit to control a first output voltage of the first power conversion unit and a second output voltage of the second power conversion unit to be connected in parallel to form an output voltage of the DC-DC converter; or inputting a second driving voltage to the first switching unit and the second switching unit to control the first output voltage and the second output voltage to be connected in series to form an output voltage of the DC-DC converter; wherein the DC-DC converter includes: the first power conversion unit is configured to perform power conversion on a first input voltage to obtain a first output voltage, the second power conversion unit is configured to perform power conversion on a second input voltage to obtain a second output voltage, a first port of a negative electrode of the first power conversion unit, which is used for outputting the first output voltage, is connected to the second switching unit, a second port of a positive electrode of the second power conversion unit, which is used for outputting the second output voltage, is connected to the first switching unit, the first switching unit and the second switching unit are connected in series and then connected to a third port of the positive electrode of the first power conversion unit, which is used for outputting the first output voltage, and a fourth port of the second power conversion unit, which is used for outputting the negative electrode of the second output voltage The output filter unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor is connected with the first switching unit in parallel, the second capacitor is connected with the second switching unit in parallel, and the third port and the fourth port are respectively connected with the output filter unit to form the output voltage of the DC-DC converter.
Optionally, inputting the first driving voltage to the first switching unit and the second switching unit to control the first output voltage of the first power conversion unit and the second output voltage of the second power conversion unit to be connected in parallel to form the output voltage of the dc-dc converter comprises: inputting the first driving voltage to the first switching unit and the second switching unit to enable the first switch and the fourth switch to be switched on, and the second switch and the third switch to be switched off; wherein the first switching unit includes: the first switch and the second switch, the second switching unit including: the third switch with the fourth switch, first switch, the second switch, the third switch with the fourth switch is established ties, first switch still with the third port is connected, the fourth switch still with the fourth port is connected, first port is connected the third switch with between the fourth switch, the second port is connected the first switch with between the second switch.
Optionally, inputting the second driving voltage to the first switching unit and the second switching unit to control the first output voltage and the second output voltage to be connected in series to form the output voltage of the dc-dc converter comprises: inputting the second driving voltage to the first switching unit and the second switching unit to enable the first switch and the fourth switch to be turned off, and the second switch and the third switch to be turned on; wherein the first switching unit includes: the first switch and the second switch, the second switching unit including: the third switch with the fourth switch, first switch, the second switch, the third switch with the fourth switch is established ties, first switch still with the third port is connected, the fourth switch still with the fourth port is connected, first port is connected the third switch with between the fourth switch, the second port is connected the first switch with between the second switch.
According to yet another embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program performs any one of the above methods when executed.
According to yet another embodiment of the present invention, there is also provided a processor for executing a program, wherein the program executes to perform the method of any one of the above.
With the present invention, a dc-dc converter includes: the power conversion circuit comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit and an output filtering unit, wherein the first power conversion unit is used for carrying out power conversion on a first input voltage to obtain a first output voltage, and the second power conversion unit is used for carrying out power conversion on a second input voltage to obtain a second output voltage; a first port of a negative pole of the first power conversion unit, which is used for outputting the first output voltage, is connected with the second switching unit, and a second port of a positive pole of the second power conversion unit, which is used for outputting the second output voltage, is connected with the first switching unit; the first switching unit and the second switching unit are connected in series and then connected between a third port of the positive pole of the first power conversion unit for outputting the first output voltage and a fourth port of the negative pole of the second power conversion unit for outputting the second output voltage; the output filtering unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor is connected with the first switching unit in parallel, and the second capacitor is connected with the second switching unit in parallel; the third port and the fourth port are respectively connected with the output filter unit to form the output voltage of the DC-DC converter, so that the output voltage of the DC-DC converter can be controlled by the first switching unit and the second switching unit by adopting the scheme, and therefore, the voltage gain adjusting capability of the switching power supply power circuit topology is improved, and the problem of poor voltage gain adjusting capability of the switching power supply power circuit topology in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a first block diagram of a dc-dc converter according to an embodiment of the present invention;
FIG. 2 is a block diagram of a DC-DC converter according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method of a dc-dc converter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a driving voltage in a control method of a dc-dc converter according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a wide range output DC to DC converter in accordance with an alternative embodiment of the present embodiment;
FIG. 6 is a first schematic diagram of a switching unit in a wide output range DC-DC converter according to an alternative embodiment of the present invention;
FIG. 7 is a second schematic diagram of a switching unit in a wide output range DC-DC converter according to an alternative embodiment of the present invention;
FIG. 8 is a schematic diagram of a DC-DC converter according to a first embodiment of the present invention;
FIG. 9 is a schematic diagram of a DC-DC converter according to a second embodiment of the present invention;
fig. 10 is a schematic diagram of a dc-dc converter according to a third embodiment of the present invention;
fig. 11 is a schematic diagram of a dc-dc converter according to a fourth embodiment of the present invention;
FIG. 12 is a schematic diagram of a DC-DC converter according to a fifth embodiment of the present invention;
fig. 13 is a schematic diagram of a dc-dc converter according to a sixth embodiment of the present invention;
fig. 14 is a schematic diagram of a dc-dc converter according to a seventh embodiment of the invention;
FIG. 15 is a schematic diagram of a DC-DC converter in accordance with an eighth embodiment of the present invention;
FIG. 16 is a schematic diagram of a DC-DC converter in accordance with a ninth embodiment of the present invention;
fig. 17 is a schematic diagram of a dc-dc converter according to a tenth embodiment of the invention;
FIG. 18 is a schematic diagram of a DC-DC converter according to an eleventh embodiment of the invention;
FIG. 19 is a schematic diagram of a DC-DC converter in accordance with a twelfth embodiment of the present invention;
fig. 20 is a schematic diagram of a dc-dc converter according to a thirteenth embodiment of the present invention;
fig. 21 is a schematic diagram of a dc-dc converter according to a fourteenth embodiment of the invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
In the present embodiment, a dc-dc converter is provided, and fig. 1 is a block diagram of a dc-dc converter according to an embodiment of the present invention, as shown in fig. 1, the dc-dc converter includes: a first power conversion unit 102, a second power conversion unit 104, a first switching unit 106, a second switching unit 108, and, wherein,
the first power conversion unit 102 is configured to perform power conversion on a first input voltage to obtain a first output voltage, and the second power conversion unit 104 is configured to perform power conversion on a second input voltage to obtain a second output voltage;
a first port 1022 of the first power conversion unit 102, which is used for outputting a negative electrode of the first output voltage, is connected to the second switching unit 108, and a second port 1042 of the second power conversion unit 104, which is used for outputting a positive electrode of the second output voltage, is connected to the first switching unit 106;
the first switching unit 106 and the second switching unit 108 are connected in series and then connected between a third port 1024 of the first power conversion unit 102 for outputting the positive electrode of the first output voltage and a fourth port 1044 of the second power conversion unit 104 for outputting the negative electrode of the second output voltage;
the output filter unit 110 includes a first capacitor 1102 and a second capacitor 1104 connected in series, the first capacitor 1102 is connected in parallel with the first switching unit 106, and the second capacitor 1204 is connected in parallel with the second switching unit 108;
the third port 1024 and the fourth port 1044 are respectively connected to the output filter unit 110 to form an output voltage of the dc-dc converter.
Therefore, by the device, the output voltage of the DC-DC converter can be controlled by the first switching unit and the second switching unit, so that the voltage gain adjusting capability of the switching power supply power circuit topology is improved, and the problem of poor voltage gain adjusting capability of the switching power supply power circuit topology in the related art is solved.
Fig. 2 is a block diagram of a structure of a dc-dc converter according to an embodiment of the present invention, as shown in fig. 2, optionally, the first switching unit 106 includes: the first switch 1062 and the second switch 1064, and the second switching unit 108 includes: a third switch 1082 and a fourth switch 1084, wherein,
the first switch 1062, the second switch 1064, the third switch 1082 and the fourth switch 1084 are connected in series, the first switch 1062 is further connected to the third port 1024, and the fourth switch 1084 is further connected to the fourth port 1044;
the first port 1022 is connected between the third switch 1082 and the fourth switch 1084, and the second port 1042 is connected between the first switch 1062 and the second switch 1064.
Alternatively, the first switch and the fourth switch may be, but are not limited to, switching devices that are each one of: a diode, a fully-controlled semiconductor switching device, a semi-controlled semiconductor switching device; the second switch and the third switch may be, but are not limited to, all-controlled semiconductor switching devices.
Optionally, in a case that the first switch and the fourth switch are all fully-controlled semiconductor switching devices, a source of the first switch is connected to a drain of the second switch, a drain of the first switch is connected to the third port, and a source of the first switch is further connected to the second port; the source electrode of the third switch is connected with the drain electrode of the fourth switch, the source electrode of the fourth switch is connected with the fourth port, and the source electrode of the third switch is also connected with the first port.
Optionally, when the first switch and the fourth switch are both diodes, an anode of the first switch is connected to a drain of the second switch, a cathode of the first switch is connected to the third port, and an anode of the first switch is further connected to the second port; the source electrode of the third switch is connected with the negative electrode of the fourth switch, the positive electrode of the fourth switch is connected with the fourth port, and the source electrode of the third switch is also connected with the first port.
Alternatively, the first power conversion unit and the second power conversion unit may be, but are not limited to, both resonant conversion circuits or Pulse Width Modulator (PWM) converters.
Optionally, the topology of the resonant conversion circuit comprises one of: half-bridge, half-bridge with diode clamping, full-bridge; the secondary side rectifying circuit of the resonant conversion circuit comprises one of the following components: full-bridge rectifier circuit, full-wave rectifier circuit.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in a plurality of processors.
Example 2
In the present embodiment, a control method of a dc-dc converter is further provided, and fig. 3 is a flowchart of a control method of a dc-dc converter according to an embodiment of the present invention, as shown in fig. 3, the flowchart includes the following steps:
step S302, inputting a first driving voltage to the first switching unit and the second switching unit to control a first output voltage of the first power conversion unit and a second output voltage of the second power conversion unit to be connected in parallel to form an output voltage of the DC-DC converter; or,
step S304, inputting a second driving voltage to the first switching unit and the second switching unit to control the first output voltage and the second output voltage to be connected in series to form an output voltage of the DC-DC converter;
wherein, DC-DC converter includes: the power conversion circuit comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit and an output filter unit, wherein the first power conversion unit is used for carrying out power conversion on a first input voltage to obtain a first output voltage, the second power conversion unit is used for carrying out power conversion on a second input voltage to obtain a second output voltage, a first port of a negative pole, which is used for outputting the first output voltage, on the first power conversion unit is connected with the second switching unit, a second port of a positive pole, which is used for outputting the second output voltage, on the second power conversion unit is connected with the first switching unit, the first switching unit and the second switching unit are connected in series and then are connected between a third port of the positive pole, which is used for outputting the first output voltage, on the first power conversion unit and a fourth port of the negative pole, which is used for outputting the second output voltage, the output filter unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor is connected with the first switching unit in parallel, the second capacitor is connected with the second switching unit in parallel, and the third port and the fourth port are respectively connected with the output filtering unit to form the output voltage of the DC-DC converter.
Alternatively, the control method of the dc-dc converter can be applied to, but not limited to, a scenario of adjusting the voltage gain of the switching power supply power circuit topology.
Through the steps, the output voltage of the DC-DC converter can be controlled through the first driving voltage or the second driving voltage input into the first switching unit and the second switching unit, so that the voltage gain adjusting capability of the switching power supply power circuit topology is improved, and the problem that the voltage gain adjusting capability of the switching power supply power circuit topology in the related art is poor is solved.
Alternatively, in the above step S302, the first output voltage of the first power conversion unit and the second output voltage of the second power conversion unit may be controlled to be connected in parallel to form the output voltage of the dc-dc converter by, but not limited to: inputting a first driving voltage to the first switching unit and the second switching unit to enable the first switch and the fourth switch to be switched on, and the second switch and the third switch to be switched off;
wherein the first switching unit includes: a first switch and a second switch, the second switching unit including: the first switch is connected with the third port, the fourth switch is connected with the fourth port, the first port is connected between the third switch and the fourth switch, and the second port is connected between the first switch and the second switch.
Optionally, in the step S304, the controlling the first output voltage and the second output voltage to form the output voltage of the dc-dc converter in series by, but not limited to, the following steps:
inputting a second driving voltage to the first switching unit and the second switching unit to enable the first switch and the fourth switch to be turned off, and enabling the second switch and the third switch to be turned on;
wherein the first switching unit includes: a first switch and a second switch, the second switching unit including: the first switch is connected with the third port, the fourth switch is connected with the fourth port, the first port is connected between the third switch and the fourth switch, and the second port is connected between the first switch and the second switch.
In an alternative implementation, fig. 4 is a schematic diagram of driving voltages in a control method of a dc-dc converter according to an embodiment of the present invention, when output voltages are switched in series and in parallel, voltage waveforms of a first switch VT1, a second switch VT2, a third switch VT3, and a fourth switch VT4 are as shown in fig. 4, driving signals of VT1 and VT4 are consistent, and driving signals of VT2 and VT3 are consistent, and since VT1 and VT2, VT3, and VT4 are in a series relationship, for increasing reliability, a certain dead time may be added between driving signals of VT1 and VT2, VT3, and VT4, so as to ensure that short circuit during switching does not occur.
Reference will now be made in detail to the alternative embodiments of the present invention.
An alternative embodiment of the present invention provides a wide-range output dc-dc converter, which can meet the requirement of a wide output voltage range, and the device can combine a plurality of output units in series or in parallel at an output end according to the range requirement of the output voltage to meet the requirements of wide-voltage range output and constant-power output, and belongs to a dc converter of an energy conversion device.
In this embodiment, the wide-range output dc-dc converter is adopted, the switching of the gain range is realized through the switching of the output end circuit topology, the doubled current output capability is ensured at low voltage, the wide-range constant power characteristic is realized while the output gain range is ensured, and the wide-range output dc-dc converter has a high application value. The wide-range output DC-DC converter also has the characteristic of wide output voltage range.
Fig. 5 is a schematic diagram of a wide-range output dc-dc converter according to an alternative embodiment of the present embodiment, as shown in fig. 5, the wide-range output dc-dc converter includes: a power conversion unit i (corresponding to the first power conversion unit) and a power conversion unit ii (corresponding to the second power conversion unit), a switching unit i (corresponding to the first switching unit) and a switching unit ii (corresponding to the second switching unit), and an output filter unit. The power conversion unit I and the power conversion unit II output two independent voltage paths, namely Vout1+ and Vout1- (equivalent to the first output voltage), Vout2+ and Vout2- (equivalent to the second output voltage). C1 (corresponding to the first capacitor), C2 (corresponding to the second capacitor) are respectively connected with the switching units I and II in parallel, Vout1- (corresponding to the first port) is connected with the switching unit II, Vout2+ (corresponding to the second port) is connected with the switching unit I, the switching units I and II are in series connection and then connected between Vout1+ (corresponding to the third port) and Vout2- (corresponding to the fourth port), and Vout1+ and Vout 2-are respectively connected with the output filter unit to form a total output voltage.
Alternatively, in this alternative embodiment, the power conversion unit may be a resonant conversion circuit, and the series topology of resonant conversion circuits includes a common half-bridge type, a half-bridge type with diode clamping, and a full-bridge type. The secondary rectifier circuit can adopt a full-bridge rectifier circuit or a full-wave rectifier circuit. The power conversion unit may also be a PWM converter, such as a DAB converter.
Optionally, in this alternative embodiment, the switching unit i and the switching unit ii are respectively composed of two switching switches connected in series, where the switching unit i includes a first switch VT1 and a second switch VT2, and the switching unit ii includes a third switch VT3 and a fourth switch VT4, fig. 6 is a schematic diagram of a switching unit in a wide-range output dc-dc converter according to the alternative embodiment of the present invention, as shown in fig. 6, VT1 and VT4 may be diodes, and VT2 and VT3 are fully-controlled semiconductor switching devices, including but not limited to MOSFETs and IGBTs. Fig. 7 is a second schematic diagram of a switching unit in a wide-range output dc-dc converter according to an alternative embodiment of the present invention, as shown in fig. 7, VT1 and VT4 may also be fully-controlled or half-controlled semiconductor switching devices, and VT2 and VT3 are fully-controlled semiconductor switching devices, including but not limited to MOSFETs and IGBTs.
Optionally, in this optional embodiment, the output filter unit includes two filter capacitors connected in series, a first capacitor C1 and a second capacitor C2, and the switching unit i and the switching unit ii are connected in series and then connected in parallel with C1 and C2, respectively.
Alternatively, in this alternative embodiment, as shown in fig. 6, two independent power outputs Vout1+ and Vout1-, Vout2+ and Vout2-, which are obtained by two independent power conversion circuits, are obtained from the power conversion unit i and the power conversion unit iirespectively. The switching unit I is composed of two switching tubes VT1 and VT2 which are connected in series, wherein the source electrode of an upper tube VT1 is connected with the drain electrode of a lower tube VT2, the drain electrode of the upper tube VT1 is connected with Vout1+, the source electrode of the lower tube VT2 is connected with the upper tube drain electrode of a switching unit II, the switching unit II is composed of two switching tubes VT3 and VT4 which are connected in series, the source electrode of an upper tube VT3 is connected with the drain electrode of the lower tube VT4 in the switching unit II, and the source electrode of a lower tube VT4 of the switching unit II is connected with the Vout 2-. The source of an upper tube VT1 of the switching unit I is connected with the drain of a lower VT2 and then connected with Vout2 +; the source of the upper tube VT3 of the switching unit II is connected with the drain of the lower tube VT4 and then connected with Vout 1-. The two ends of the switching unit I and the switching unit II are respectively connected with filtering electrolytic capacitors C1 and C2 in parallel. Vout1+ and Vout 2-are respectively connected to the output filter unit, and are filtered to be output as output voltage. According to the connection relation, when VT1 and VT4 are turned on, and VT2 and VT3 are turned off, Vout1+ and Vout2+ are connected together through VT1, Vout 1-and Vout 2-are connected together through VT4, two independent outputs are output as a parallel connection relation, and C1 and C2 are connected in series and then are used as a filter capacitor of a total output, at the moment, the total output voltage is equal to each independent output voltage, and the output current of the total output is 2 times of that of each independent voltage, so that the circuit can be used under the condition of low voltage and large current. According to the connection relation, when VT1 and VT4 are turned off, and VT2 and VT3 are turned on, Vout 1-Vout 2+ are connected together through the turn-on of VT2 and VT3, two independent outputs are output as a series connection relation, and C1 and C2 are connected in series to be used as a filter capacitor of a total output, at the moment, the total output voltage is 2 times of each independent output voltage, and the output current of the total output is equal to the output current of each independent voltage, so that the circuit can be used under the condition of high voltage and small current. When the output is switched in series and in parallel, the driving voltage waveforms of VT1, VT2, VT3 and VT4 are as shown in FIG. 4, the driving signals of VT1 and VT4 are consistent, and the driving signals of VT2 and VT3 are consistent, because VT1, VT2, VT3 and VT4 are in series relation, in order to increase reliability, a certain dead time can be added between the driving signals of VT1, VT2, VT3 and VT4, so as to ensure that short circuit in the switching process does not occur.
The difference between the connection structure shown in fig. 3 and the structure shown in fig. 2 is that when the two independent output voltages Vout1+ and Vout1-, Vout2+ and Vout 2-are in the parallel output state, the filter capacitors C1 and C2 are in the parallel state, and when the two independent output voltages Vout1+ and Vout1-, Vout2+ and Vout 2-are in the series output state, the filter capacitors C1 and C2 are in the series state.
The present invention will be described in detail with reference to specific examples.
Detailed description of the preferred embodiment
Fig. 8 is a schematic diagram of a dc-dc converter according to a first embodiment of the present invention, as shown in fig. 8, the converter is composed of the following parts: the two-stage half-bridge LLC resonant conversion circuit comprises two independent direct current input sources Vin1 and Vin2 with equal amplitude, two half-bridge LLC resonant conversion circuits with diode clamps, a full-wave rectification circuit is connected to the secondary side of each half-bridge LLC resonant circuit, and the output ends of the two full-wave rectification circuits are Vout1+ and Vout1-, Vout2+ and Vout 2-. The primary side of the transformers T1 and T2 is two paths of independently working half bridge LLC resonant circuits, the secondary sides of T1 and T2 are respectively connected with a full wave rectification circuit, the two paths of half bridge LLC resonant circuits are respectively provided with resonant inductors Lr1 and Lr2, and primary windings Lm1 and Lm2 of the transformers. Vout1+ and Vout1-, Vout2+ and Vout2-, respectively connected with filter capacitors C1 and C2. The two N-channel MOSFET switching tubes VT1 and VT2 form a switching unit I, wherein the source electrode of a top tube VT1 is connected with the drain electrode of a bottom tube VT2, the drain electrode of the top tube VT1 is connected with Vout1+, and the source electrode of the bottom tube VT2 is connected with the top tube drain electrode of a switching unit II; the two N-channel MOSFET switching tubes VT3 and VT4 form a switching unit II, the source of the upper tube VT3 is connected with the drain of the lower tube VT4 in the switching unit II, and the source of the lower tube VT4 of the switching unit II is connected with Vout 2-. The source electrode of the upper tube VT1 of the switching unit I is connected with the drain electrode of the lower VT2 and then connected with Vout2 +; the source of the upper tube VT3 of the switch unit II is connected with the drain of the lower tube VT4 and then connected with Vout 1-. And filter electrolytic capacitors C2 and C4 are respectively connected in parallel at two ends of the switching units I and II. Vout1+ and Vout 2-are respectively connected to the output filter unit, and are filtered to be output as output voltage. According to the connection relation, when VT1 and VT4 are turned on, VT2 and VT3 are turned off, Vout1+ and Vout2+ are connected together through VT1, Vout 1-and Vout 2-are connected together through VT4, two independent outputs are output as a parallel connection relation, C2 and C4 are connected in series to serve as a filter capacitor of a total output, when VT1 and VT4 are turned off, VT2 and VT3 are turned on, Vout 1-and Vout2+ are connected together through the turn-on of VT2 and VT3, two independent outputs are output as a series connection relation, and C2 and C4 are connected in series to serve as a filter capacitor of the total output, so that the switching can increase the output voltage range and improve the low-voltage load capacity.
Detailed description of the invention
Fig. 9 is a schematic diagram of a dc-dc converter according to a second embodiment of the present invention, and as shown in fig. 9, the switches VT1 and VT4 are replaced by diodes VD1 and VD4 on the basis of the first embodiment.
Detailed description of the preferred embodiment
Fig. 10 is a schematic diagram of a dc-dc converter according to a third embodiment of the present invention, and as shown in fig. 10, the difference from the first embodiment is that in this embodiment, the two-way independently-input half-bridge LLC resonant circuit is a normal half-bridge LLC resonant conversion circuit without diode clamp.
Detailed description of the invention
Fig. 11 is a schematic diagram of a dc-dc converter according to a fourth embodiment of the present invention, and as shown in fig. 11, the switches VT1 and VT4 are replaced by diodes VD1 and VD4 on the basis of the third embodiment.
Detailed description of the preferred embodiment
Fig. 12 is a schematic diagram of a dc-dc converter according to a fifth embodiment of the present invention, which is different from the first embodiment in that a full-bridge synchronous rectification circuit is connected to the secondary sides of two independent transformers T1 and T2 in this embodiment, as shown in fig. 12.
Detailed description of the preferred embodiment
Fig. 13 is a schematic diagram of a dc-dc converter according to a sixth embodiment of the present invention, and as shown in fig. 13, the switches VT1 and VT4 are replaced by diodes VD1 and VD4 on the basis of the fifth embodiment.
Detailed description of the preferred embodiment
Fig. 14 is a schematic diagram of a dc-dc converter according to a seventh embodiment of the present invention, and as shown in fig. 14, the difference between the second embodiment is that a full-bridge synchronous rectification circuit is connected to the secondary side of each of the independent transformers T1 and T2.
Detailed description of the preferred embodiment
Fig. 15 is a schematic diagram of a dc-dc converter according to an eighth embodiment of the present invention, and as shown in fig. 15, the switches VT1 and VT4 are replaced by diodes VD1 and VD4 on the basis of the seventh embodiment.
Detailed description of the preferred embodiment
Fig. 16 is a schematic diagram of a dc-dc converter according to a ninth embodiment of the present invention, and as shown in fig. 16, the difference from the first embodiment is that in this embodiment, two full-bridge LLC resonant conversion circuits are connected to two independent constant-amplitude input sources Vin1 and Vin 2.
Detailed description of the preferred embodiment
Fig. 17 is a schematic diagram of a dc-dc converter according to a tenth embodiment of the present invention, and as shown in fig. 17, the switches VT1 and VT4 are replaced by diodes VD1 and VD4 on the basis of the ninth embodiment.
Detailed description of the invention
Fig. 18 is a schematic diagram of a dc-dc converter according to an eleventh embodiment of the present invention, and as shown in fig. 18, the difference between the fifth embodiment and the fifth embodiment is that a full-bridge synchronous rectification circuit is connected to the secondary side of each of the independent transformers T1 and T2.
Detailed description of the preferred embodiment
Fig. 19 is a schematic diagram of a dc-dc converter according to a twelfth embodiment of the present invention, and as shown in fig. 19, the switches VT1 and VT4 are replaced by diodes VD1 and VD4 on the basis of the eleventh embodiment.
Thirteenth embodiment
Fig. 20 is a schematic diagram of a dc-dc converter according to a thirteenth embodiment of the present invention, and as shown in fig. 20, the difference from the first embodiment is that in this embodiment, there are 3 independent dc input sources Vin1, Vin2, Vin3 with equal amplitude. Each input source is connected with a full-bridge LLC resonant conversion circuit, each full-bridge LLC resonant conversion circuit is respectively provided with resonant inductors Lr1, Lr2 and Lr3, and each full-bridge LLC resonant conversion circuit is respectively provided with two transformers with primary windings connected in series, namely T1, T2, T3, T4, T5 and T6. Each transformer primary winding is respectively Lm1, Lm2, Lm3, Lm4, Lm5 and Lm6, wherein Lm1 and Lm2 are connected in series, Lm3 and Lm4 are connected in series, Lm5 and Lm6 are connected in series, wherein the transformer secondary windings corresponding to Lm1, Lm3 and Lm5 are connected in a Y-shaped manner on the transformer secondary, and then are connected with a diode bridge rectifier circuit to generate output voltages Vout1+ and Vout 1-; similarly, secondary windings of the transformers corresponding to Lm2, Lm4 and Lm6 are connected in a Y shape on the secondary windings of the transformers and then connected with a diode bridge rectification circuit to generate output voltages Vout2+ and Vout 2-.
Detailed description of the invention
Fig. 21 is a schematic diagram of a dc-dc converter according to a fourteenth embodiment of the present invention, and as shown in fig. 21, the switches VT1 and VT4 are replaced by diodes VD13 and VD14 on the basis of the thirteenth embodiment.
The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person skilled in the art can modify the technical solution of the present invention or substitute the same without departing from the spirit and scope of the present invention, and the scope of the present invention should be determined by the claims.
Example 4
An embodiment of the present invention further provides a storage medium including a stored program, where the program executes any one of the methods described above.
Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:
s1, inputting a first driving voltage to the first switching unit and the second switching unit to control the first output voltage of the first power conversion unit and the second output voltage of the second power conversion unit to be connected in parallel to form the output voltage of the DC-DC converter; or,
s2, inputting a second driving voltage to the first switching unit and the second switching unit to control the first output voltage and the second output voltage to be connected in series to form an output voltage of the DC-DC converter;
wherein, DC-DC converter includes: the power conversion circuit comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit and an output filter unit, wherein the first power conversion unit is used for carrying out power conversion on a first input voltage to obtain a first output voltage, the second power conversion unit is used for carrying out power conversion on a second input voltage to obtain a second output voltage, a first port of a negative pole, which is used for outputting the first output voltage, on the first power conversion unit is connected with the second switching unit, a second port of a positive pole, which is used for outputting the second output voltage, on the second power conversion unit is connected with the first switching unit, the first switching unit and the second switching unit are connected in series and then are connected between a third port of the positive pole, which is used for outputting the first output voltage, on the first power conversion unit and a fourth port of the negative pole, which is used for outputting the second output voltage, the output filter unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor is connected with the first switching unit in parallel, the second capacitor is connected with the second switching unit in parallel, and the third port and the fourth port are respectively connected with the output filtering unit to form the output voltage of the DC-DC converter.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Embodiments of the present invention also provide a processor configured to execute a program, where the program executes to perform any of the steps in the method.
Optionally, in this embodiment, the program is configured to perform the following steps:
s1, inputting a first driving voltage to the first switching unit and the second switching unit to control the first output voltage of the first power conversion unit and the second output voltage of the second power conversion unit to be connected in parallel to form the output voltage of the DC-DC converter; or,
s2, inputting a second driving voltage to the first switching unit and the second switching unit to control the first output voltage and the second output voltage to be connected in series to form an output voltage of the DC-DC converter;
wherein, DC-DC converter includes: the power conversion circuit comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit and an output filter unit, wherein the first power conversion unit is used for carrying out power conversion on a first input voltage to obtain a first output voltage, the second power conversion unit is used for carrying out power conversion on a second input voltage to obtain a second output voltage, a first port of a negative pole, which is used for outputting the first output voltage, on the first power conversion unit is connected with the second switching unit, a second port of a positive pole, which is used for outputting the second output voltage, on the second power conversion unit is connected with the first switching unit, the first switching unit and the second switching unit are connected in series and then are connected between a third port of the positive pole, which is used for outputting the first output voltage, on the first power conversion unit and a fourth port of the negative pole, which is used for outputting the second output voltage, the output filter unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor is connected with the first switching unit in parallel, the second capacitor is connected with the second switching unit in parallel, and the third port and the fourth port are respectively connected with the output filtering unit to form the output voltage of the DC-DC converter.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A dc-dc converter, comprising: a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit and an output filtering unit,
the first power conversion unit is used for performing power conversion on a first input voltage to obtain a first output voltage, and the second power conversion unit is used for performing power conversion on a second input voltage to obtain a second output voltage;
a first port of a negative electrode of the first power conversion unit, which is used for outputting the first output voltage, is connected with the second switching unit, and a second port of a positive electrode of the second power conversion unit, which is used for outputting the second output voltage, is connected with the first switching unit;
the first switching unit and the second switching unit are connected in series and then connected between a third port of a positive pole of the first power conversion unit for outputting the first output voltage and a fourth port of a negative pole of the second power conversion unit for outputting the second output voltage;
the output filtering unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor is connected with the first switching unit in parallel, and the second capacitor is connected with the second switching unit in parallel;
the third port and the fourth port are respectively connected with the output filter unit to form the output voltage of the DC-DC converter.
2. The dc-dc converter according to claim 1, wherein the first switching unit comprises: a first switch and a second switch, the second switching unit including: a third switch and a fourth switch, wherein,
the first switch, the second switch, the third switch and the fourth switch are connected in series, the first switch is further connected with the third port, and the fourth switch is further connected with the fourth port;
the first port is connected between the third switch and the fourth switch, and the second port is connected between the first switch and the second switch.
3. The DC-DC converter according to claim 2,
the first switch and the fourth switch are switching devices that are each one of: a diode, a fully-controlled semiconductor switching device, a semi-controlled semiconductor switching device;
the second switch and the third switch are all fully-controlled semiconductor switch devices.
4. The DC-DC converter according to claim 3, wherein in the case where the first switch and the fourth switch are all-controlled semiconductor switching devices,
the source electrode of the first switch is connected with the drain electrode of the second switch, the drain electrode of the first switch is connected with the third port, and the source electrode of the first switch is also connected with the second port;
the source electrode of the third switch is connected with the drain electrode of the fourth switch, the source electrode of the fourth switch is connected with the fourth port, and the source electrode of the third switch is further connected with the first port.
5. The DC-DC converter according to claim 3, wherein in case both the first switch and the fourth switch are diodes,
the anode of the first switch is connected with the drain of the second switch, the cathode of the first switch is connected with the third port, and the anode of the first switch is also connected with the second port;
the source electrode of the third switch is connected with the negative electrode of the fourth switch, the positive electrode of the fourth switch is connected with the fourth port, and the source electrode of the third switch is also connected with the first port.
6. The DC-DC converter according to any one of claims 1 to 5, wherein the first power conversion unit and the second power conversion unit are both a resonant conversion circuit or a PWM converter.
7. The DC-DC converter according to claim 6,
the topology of the resonant conversion circuit comprises one of: half-bridge, half-bridge with diode clamping, full-bridge;
the secondary side rectifying circuit of the resonance conversion circuit comprises one of the following components: full-bridge rectifier circuit, full-wave rectifier circuit.
8. A method of controlling a dc-dc converter, comprising:
inputting a first driving voltage to the first switching unit and the second switching unit to control a first output voltage of the first power conversion unit and a second output voltage of the second power conversion unit to be connected in parallel to form an output voltage of the DC-DC converter; or,
inputting a second driving voltage to the first switching unit and the second switching unit to control the first output voltage and the second output voltage to be connected in series to form an output voltage of the DC-DC converter;
wherein the DC-DC converter includes: the first power conversion unit is configured to perform power conversion on a first input voltage to obtain a first output voltage, the second power conversion unit is configured to perform power conversion on a second input voltage to obtain a second output voltage, a first port of a negative electrode of the first power conversion unit, which is used for outputting the first output voltage, is connected to the second switching unit, a second port of a positive electrode of the second power conversion unit, which is used for outputting the second output voltage, is connected to the first switching unit, the first switching unit and the second switching unit are connected in series and then connected to a third port of the positive electrode of the first power conversion unit, which is used for outputting the first output voltage, and a fourth port of the second power conversion unit, which is used for outputting the negative electrode of the second output voltage The output filter unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor is connected with the first switching unit in parallel, the second capacitor is connected with the second switching unit in parallel, and the third port and the fourth port are respectively connected with the output filter unit to form the output voltage of the DC-DC converter.
9. The method of claim 8, wherein inputting the first driving voltage to the first switching unit and the second switching unit to control the first output voltage of the first power conversion unit and the second output voltage of the second power conversion unit to be connected in parallel to form the output voltage of the dc-dc converter comprises:
inputting the first driving voltage to the first switching unit and the second switching unit to enable the first switch and the fourth switch to be switched on, and the second switch and the third switch to be switched off;
wherein the first switching unit includes: the first switch and the second switch, the second switching unit including: the third switch with the fourth switch, first switch, the second switch, the third switch with the fourth switch is established ties, first switch still with the third port is connected, the fourth switch still with the fourth port is connected, first port is connected the third switch with between the fourth switch, the second port is connected the first switch with between the second switch.
10. The method of claim 8, wherein inputting the second driving voltage to the first switching unit and the second switching unit to control the first output voltage and the second output voltage to form an output voltage of the DC-DC converter in series comprises:
inputting the second driving voltage to the first switching unit and the second switching unit to enable the first switch and the fourth switch to be turned off, and the second switch and the third switch to be turned on;
wherein the first switching unit includes: the first switch and the second switch, the second switching unit including: the third switch with the fourth switch, first switch, the second switch, the third switch with the fourth switch is established ties, first switch still with the third port is connected, the fourth switch still with the fourth port is connected, first port is connected the third switch with between the fourth switch, the second port is connected the first switch with between the second switch.
11. A storage medium comprising a stored program, wherein the program when executed performs the method of any one of claims 8 to 10.
12. A processor, configured to run a program, wherein the program when running performs the method of any one of claims 8 to 10.
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