HK1151385B - Electric transformer - Google Patents

Description

Voltage transformation device

Technical Field

The present invention relates to a transformer device, and more particularly to a transformer device that can be mounted on an electric train that runs in both an ac section and a dc section.

Background

An ac/dc electric vehicle has been developed that can travel in both an ac section in which an ac voltage is supplied from an overhead wire or the like and a dc section in which a dc voltage is supplied from an overhead wire or the like. In a conventional electric vehicle, for example, a reactor may be separately disposed from a transformer, and a transformer and a reactor may be accommodated in an integrated case. However, in such an ac/dc electric vehicle, an ac section device such as a transformer cannot be used in a dc section, and a dc section device such as a reactor cannot be used in an ac section. Therefore, although both the ac section device and the dc section device are required, it is sometimes difficult to mount both devices in a limited space such as under the floor of the vehicle body.

Here, japanese patent laying-open No. 3-38807 discloses a parallel reactor-sharing type transformer in which a transformer and a parallel reactor are integrated as follows. That is, the transformer includes a bypass core provided in a part of a yoke of the transformer, and a gap core and a reactor winding provided in a space surrounded by the part of the yoke and the bypass core. The bypass core forms a yoke of the reactor, and the winding direction of the winding of the transformer and the winding direction of the winding of the shunt reactor are directions in which the transformer magnetic flux and the reactor magnetic flux in a part of the yoke cancel each other.

Further, japanese patent laying-open No. 11-273975 discloses the following common mode choke coil. Specifically, the magnetic core comprises a 1 st winding, a 2 nd winding, a 3 rd winding and a 4 th winding which are formed by edgewise winding a flat wire, and a magnetic core which forms a square closed magnetic circuit. The 1 st and 2 nd windings are arranged on one leg of the core, the 3 rd and 4 th windings are arranged on the other leg, and the 1 st and 3 rd windings and the 2 nd and 4 th windings are connected in series. The magnetic fluxes generated in the 1 st and 2 nd windings, the 2 nd and 3 rd windings, the 3 rd and 4 th windings, and the 4 th and 1 st windings by the line current are cancelled out, and the magnetic fluxes generated in the 1 st and 3 rd and the 2 nd and 4 th windings are mutually strengthened. The winding direction of each winding is set so that magnetic fluxes generated in the 1 st, 2 nd, 3 rd, and 4 th windings by currents flowing in the same direction are respectively increased, and the 1 st and 4 th windings are arranged side by side, and the 2 nd and 3 rd windings are arranged side by side.

Patent document 1: japanese patent laid-open No. Hei 3-38807

Patent document 2: japanese patent laid-open No. Hei 11-273975

However, in the structure described in Japanese patent laid-open No. 3-38807, the transformer and the reactor function respectively, and in the structure described in Japanese patent laid-open No. 11-273975, the common mode choke coil does not have the transformer function. In addition, although the size and mass of the transformer mounted on the electric train account for a large proportion of the devices for the ac section, the transformer is not used in the dc section and therefore only becomes a load, which is a factor of reducing the performance of the electric train.

Disclosure of Invention

Therefore, an object of the present invention is to provide a transformer device that operates as a transformer, which is an ac section device, in an ac/dc electric vehicle, and operates as a reactor, which is a dc section device, in a dc section, thereby reducing an installation space of a vehicle body.

A transformer apparatus according to an aspect of the present invention includes a 1 st high-voltage side winding, a 1 st low-voltage side winding magnetically coupled to the 1 st high-voltage side winding, a 2 nd low-voltage side winding magnetically coupled to the 1 st high-voltage side winding, and a 1 st switch that switches whether a voltage supplied from the outside is supplied to the 1 st low-voltage side winding and the 2 nd low-voltage side winding or to the 1 st high-voltage side winding, wherein the 1 st low-voltage side winding and the 2 nd low-voltage side winding are provided so that a magnetic flux generated by a current flowing through the 1 st low-voltage side winding and a magnetic flux generated by a current flowing through the 2 nd low-voltage side winding cancel each other when the voltage is supplied by the 1 st switch.

According to the present invention, in the ac/dc electric vehicle, the transformer serving as the ac section device is operated in the ac section, and the reactor serving as the dc section device is operated in the dc section, so that the installation space of the vehicle body can be reduced. In addition, stable output can be obtained in both the dc section and the ac section.

Drawings

Fig. 1 is a circuit diagram showing a configuration of an ac/dc electric vehicle according to an embodiment of the present invention.

Fig. 2 is a perspective view showing the structure of a transformer device according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a transformer showing current and magnetic flux generated in an ac section.

Fig. 4 is a schematic diagram showing the direction of current flowing in the high-voltage side winding in the ac section by the ac voltage supplied from the overhead wire.

Fig. 5 is a schematic diagram showing the direction of current flowing in the high-voltage side winding in the ac section by the ac voltage supplied from the overhead wire.

Fig. 6(a) is a cross-sectional view of a window portion of the transformer showing a current generated in the ac section. (b) The graph shows leakage magnetic flux generated in the core in the ac section.

Fig. 7 is a diagram showing the setting of each switch in the dc section, assuming that the ac/dc electric train according to the embodiment of the present invention does not include the switch SW 3.

Fig. 8 is a cross-sectional view of the transformer showing the current and magnetic flux generated in the dc section.

Fig. 9 is a schematic diagram showing the direction of current flowing through the low-voltage side winding in the dc section by the dc voltage supplied from the overhead wire.

Fig. 10 is a schematic diagram showing the direction of current flowing through the low-voltage side winding in the dc section by the dc voltage supplied from the overhead wire.

Fig. 11(a) is a cross-sectional view of a window portion of the transformer showing current and magnetic flux generated in the dc section. (b) The graph shows leakage magnetic flux generated in the core in the dc section.

Fig. 12 is a diagram showing the setting of each switch in the dc section of the ac/dc electric train according to the embodiment of the present invention.

Fig. 13 is a cross-sectional view of the transformer showing the current and magnetic flux generated in the dc section.

Fig. 14(a) is a cross-sectional view of a window portion of the transformer showing current and magnetic flux generated in the dc section. (b) The graph shows leakage magnetic flux generated in the core in the dc section.

Fig. 15 is a graph showing the dependence of inductance on current.

Description of the reference symbols

1 overhead line, 2 pantograph, 3 high-voltage side winding, 4A, 4B low-voltage side winding, 5A, 5B converter, 6A, 6B inverter, 13A, 13B high-voltage side winding, 14 iron core, 51 transformer, 101 transformer, 201 ac/dc electric car, SW1, SW2A, SW2B, SW3, SW4A, SW4B, SW5A, SW5B, SW6A, SW6B, SW7A, SW7B switch, W1, W2 window part

Detailed Description

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

[ Structure and basic operation ]

Fig. 1 is a circuit diagram showing a configuration of an ac/dc electric vehicle according to an embodiment of the present invention.

Referring to fig. 1, an ac/dc trolley 201 includes a pantograph 2; a voltage transformation device 101; and motors MA, MB. The transforming device 101 comprises a transformer 51; inverters 5A, 5B; inverters 6A, 6B; and switches SW4A, SW4B, SW5A, SW5B, SW6A, SW6B, SW7A, SW 7B. The transformer 51 includes a high-voltage side winding 3; low-voltage side windings 4A, 4B; and switches SW1, SW2A, SW2B, SW 3. The high-voltage side winding 3 includes high-voltage side windings 13A, 13B.

The pantograph 2 is connected to the overhead wire 1. The switch SW1 has a 1 st terminal connected to the pantograph 2, and a 2 nd terminal connected to the 1 st terminal of the high-voltage side winding 13A and the 1 st terminal of the high-voltage side winding 13B. The switch SW2A has a 1 st terminal connected to the pantograph 2 and a 2 nd terminal connected to the 1 st terminal of the low-voltage side winding 4A. The switch SW2B has a 1 st terminal connected to the pantograph 2 and a 2 nd terminal connected to a 2 nd terminal of the low-voltage side winding 4B. Switch SW3 has a 1 st terminal connected to the 2 nd terminal of high side winding 13A and a 2 nd terminal connected to the 2 nd terminal of high side winding 13B.

Switch SW4A has a 1 st terminal connected to the 1 st terminal of low-voltage side winding 4A and a 2 nd terminal connected to the 1 st input terminal of inverter 5A. Switch SW4B has terminal 1 connected to terminal 2 of low-voltage side winding 4B and terminal 2 connected to the 2 nd input terminal of inverter 5B. Switch SW5A has terminal 1 connected to terminal 2 of low-voltage side winding 4A, terminal 2 connected to the 2 nd input terminal of inverter 5A, and terminal 3. Switch SW5B has terminal 1 connected to terminal 1 of low-voltage side winding 4B, terminal 2 connected to the 1 st input terminal of inverter 5B, and terminal 3. The switch SW6A has a 1 st terminal connected to the 1 st output terminal of the converter 5A, a 2 nd terminal connected to the 1 st input terminal of the inverter 6A, and a 3 rd terminal connected to the 3 rd terminal of the switch SW 5A. The switch SW6B has a 1 st terminal connected to the 1 st output terminal of the converter 5B, a 2 nd terminal connected to the 1 st input terminal of the inverter 6B, and a 3 rd terminal connected to the 3 rd terminal of the switch SW 5B. The switch SW7A has a 1 st terminal connected to the 2 nd output terminal of the converter 5A, a 2 nd terminal connected to the 2 nd input terminal of the inverter 6A, and a 3 rd terminal connected to a ground node to which a ground voltage is supplied. The switch SW7B has a 1 st terminal connected to the 2 nd output terminal of the converter 5B, a 2 nd terminal connected to the 2 nd input terminal of the inverter 6B, and a 3 rd terminal connected to a ground node to which a ground voltage is supplied.

Fig. 2 is a perspective view showing the structure of a transformer device according to an embodiment of the present invention.

Referring to fig. 2, the transformer apparatus 101 further includes a core 14. The core 14 has a 1 st side surface and a 2 nd side surface facing each other, and window portions W1 and W2 penetrating from the 1 st side surface to the 2 nd side surface.

The high-voltage side windings 13A and 13B and the low-voltage side windings 4A and 4B are wound to pass through the window portions W1 and W2.

The high-voltage side winding 13A is provided between the low-voltage side winding 4A and the low-voltage side winding 4B at a position facing the low-voltage side winding 4A, and is magnetically coupled to the low-voltage side winding 4A.

High-voltage side winding 13B is connected in parallel with high-voltage side winding 13A, is provided between low-voltage side winding 4A and low-voltage side winding 4B at a position facing low-voltage side winding 4B, and is magnetically coupled to low-voltage side winding 4B.

Referring again to fig. 1, the switches SW1, SW2A, and SW2B switch whether the voltage supplied from the overhead wire 1 through the pantograph 2 is supplied to the low-voltage side winding 4A and the low-voltage side winding 4B or to the high-voltage side windings 13A and 13B.

Switch SW3 is connected between high-voltage side winding 13A and high-voltage side winding 13B, and switches whether or not a closed circuit including high-voltage side winding 13A and high-voltage side winding 13B is formed.

The converter 5A converts the alternating voltage appearing in the low-voltage side winding 4A into a direct voltage. The converter 5B converts the alternating voltage appearing in the low-voltage side winding 4B into a direct voltage.

The switches SW4A and SW5A switch whether the low-voltage side winding 4A is connected to the converter 5A or the low-voltage side winding 4A is connected to the inverter 6A via the switch SW 6A. The switches SW4B and SW5B switch whether the low-voltage side winding 4B is connected to the converter 5B or the low-voltage side winding 4B is connected to the inverter 6B through the switch SW 6B.

The inverter 6A converts the dc voltage received from the converter 5A or the dc voltage received from the low-voltage side winding 4A via the switch SW5A into a three-phase ac voltage, and outputs the three-phase ac voltage to the motor MA. Inverter 6B converts the dc voltage received from converter 5B or the dc voltage received from low-voltage side winding 4B via switch SW5B into a three-phase ac voltage, and outputs the three-phase ac voltage to motor MB.

The motor MA is driven in accordance with the three-phase alternating-current voltage received from the inverter 6A. The motor MB is driven based on the three-phase alternating-current voltage received from the inverter 6B.

[ actions ]

Next, the operation of the transformer apparatus according to the embodiment of the present invention in the ac section will be described.

Referring to fig. 1, in the ac interval, switch SW1 is on, switches SW2A and SW2B are off, switch SW3 is on, and switches SW4A and SW4B are on. The 1 st terminal and the 2 nd terminal of the switches SW5A, SW5B, SW6A, SW6B, SW7A, and SW7B are connected, respectively.

Fig. 3 is a cross-sectional view of a transformer showing current and magnetic flux generated in an ac section.

First, an ac voltage is supplied from the overhead wire 1 to the pantograph 2. The ac voltage supplied from the overhead wire 1 is applied to the high-voltage side windings 13A and 13B through the pantograph 2 and the switch SW 1. Accordingly, ac current 1H flows through each of the high-voltage side windings 13A and 13B.

Fig. 4 is a schematic diagram showing the direction of current flowing in the high-voltage side winding in the ac section by the ac voltage supplied from the overhead wire. Fig. 4 shows a case where the winding directions of the high-voltage side windings 13A and 13B are the same.

Fig. 5 is a schematic diagram showing the direction of current flowing in the high-voltage side winding in the ac section by the ac voltage supplied from the overhead wire. Fig. 5 shows a case where the winding directions of the high-voltage side windings 13A and 13B are opposite to each other.

In both fig. 4 and fig. 5, the high-voltage side windings 13A and 13B are provided so that magnetic flux generated by current flowing through the high-voltage side winding 13A when voltage is supplied from the overhead wire 1 via the switch SW1 and magnetic flux generated by current flowing through the high-voltage side winding 13B when voltage is supplied from the overhead wire 1 via the switch SW1 are in the same direction.

Referring again to fig. 3, a main magnetic flux FH is generated in the core 14 by the ac current 1H. Therefore, an alternating current IL and an alternating voltage corresponding to the ratio of the number of turns of the low-voltage side winding 4A to the number of turns of the high-voltage side winding 13A are generated in the low-voltage side winding 4A by the main magnetic flux FH. Further, the main magnetic flux FH generates an alternating current IL and an alternating voltage in the low-voltage side winding 4B corresponding to the ratio of the number of turns of the low-voltage side winding 4B to the number of turns of the high-voltage side winding 13B.

Here, since the low-voltage side windings 4A and 4B have fewer turns than the high-voltage side windings 13A and 13B, respectively, an ac voltage is generated in the low-voltage side windings 4A and 4B by reducing the ac voltage applied to the high-voltage side windings 13A and 13B.

The alternating-current voltage appearing in the low-voltage side winding 4A is supplied to the inverter 5A through the switches SW4A and SW 5A. In addition, the alternating-current voltage appearing in the low-voltage side winding 4B is supplied to the inverter 5B through the switches SW4B and SW5B, respectively.

The converter 5A converts the ac voltage supplied from the low-voltage side winding 4A into a dc voltage, and outputs the dc voltage to the inverter 6A via the switches SW6A and SW 7A. The converter 5B converts the ac voltage supplied from the low-voltage side winding 4B into a dc voltage, and outputs the dc voltage to the inverter 6B through the switches SW6B and SW 7B.

The inverter 6A converts the dc voltage received from the converter 5A into a three-phase ac voltage, and outputs the three-phase ac voltage to the motor MA. Inverter 6B converts the dc voltage received from converter 5B into a three-phase ac voltage, and outputs the three-phase ac voltage to motor MB.

The motor MA rotates in accordance with the three-phase ac voltage received from the inverter 6A. Further, the motor MB rotates in accordance with the three-phase ac voltage received from the inverter 6B.

Fig. 6(a) is a cross-sectional view of a window portion of the transformer showing a current generated in the ac section. Fig. 6(b) is a graph showing leakage magnetic flux generated in the core in the ac section. In fig. 6(b), the vertical axis shows the magnitude of the leakage magnetic flux F.

In the transformer 51, the low-voltage side windings 4A and 4B are arranged on both sides of the high-voltage side winding 13. In addition, the high-voltage side winding 13 includes separate high-voltage side windings 13A and 13B. With this configuration, the low-voltage side windings 4A and 4B can be magnetically coupled to each other.

That is, as shown in fig. 6(B), since the short-circuit impedances, which are leakage fluxes generated in the low-voltage side windings 4A and 4B, respectively, do not overlap with each other, magnetic interference of the low-voltage side windings 4A and 4B can be reduced, and the output of the transformer 51 can be stabilized.

Next, the operation of the transformer apparatus according to the embodiment of the present invention in the dc section will be described. First, a case will be described in which the ac/dc electric vehicle according to the embodiment of the present invention does not have the switch SW 3.

Fig. 7 is a diagram showing the setting of each switch in the dc section, assuming that the ac/dc electric train according to the embodiment of the present invention does not include the switch SW 3.

Referring to fig. 7, in the dc interval, the switch SW1 is turned off, the switches SW2A and SW2B are turned on, and the switches SW4A and SW4B are turned off. The 1 st terminal and the 3 rd terminal of the switches SW5A and SW5B are connected to each other. The 2 nd and 3 rd terminals of the switches SW6A, SW6B, SW7A, and SW7B are connected, respectively.

Fig. 8 is a cross-sectional view of the transformer showing the current and magnetic flux generated in the dc section.

Referring to fig. 7 and 8, first, a dc voltage is supplied from the overhead wire 1 to the pantograph 2. The dc voltage supplied from the overhead wire 1 is applied to the low-voltage side windings 4A and 4B through the pantograph 2 and the switches SW2A and SW2B, respectively. Therefore, a direct current ILA flows through the low-voltage side winding 4A, and a main magnetic flux FLA is generated in the core 14 by the direct current ILA. A direct current ILB flows through the low-voltage side winding 4B, and a main flux FLB is generated in the core 14 by the direct current ILB.

Here, the 2 nd terminal of the switch SW2A is connected to the 1 st terminal of the low voltage side winding 4A, and the 2 nd terminal of the switch SW2B is connected to the 2 nd terminal of the low voltage side winding 4B. Thus, the direction of the current ILA flowing through the low-voltage side winding 4A when the voltage is supplied through the switch SW2A is opposite to the direction of the current ILB flowing through the low-voltage side winding 4B when the voltage is supplied through the switch SW 2B. That is, magnetic flux FLA generated by current ILA flowing through low-voltage side winding 4A and magnetic flux FLB generated by current ILB flowing through low-voltage side winding 4B cancel each other out. With this configuration, magnetic saturation of the core 14 can be prevented, and therefore, leakage magnetic flux can be reduced.

Fig. 9 is a schematic diagram showing the direction of current flowing through the low-voltage side winding in the dc section by the dc voltage supplied from the overhead wire. Fig. 9 shows a case where the winding directions of the low-voltage side windings 4A and 4B are the same.

Fig. 10 is a schematic diagram showing the direction of current flowing through the low-voltage side winding in the dc section by the dc voltage supplied from the overhead wire. Fig. 10 shows a case where the winding directions of the low-voltage side windings 4A and 4B are opposite to each other.

In both fig. 9 and fig. 10, the low-voltage side windings 4A and 4B are provided such that a magnetic flux generated by the current ILA flowing through the low-voltage side winding 4A when a voltage is supplied from the overhead wire 1 via the switch SW2A and a magnetic flux generated by the current ILB flowing through the low-voltage side winding 4B when a voltage is supplied from the overhead wire 1 via the switch SW2B cancel each other.

Then, the dc voltage applied to the low-voltage side winding 4A is supplied to the inverter 6A through the switches SW5A and SW 6A. In addition, the dc voltage applied to the low-voltage side winding 4B is supplied to the inverter 6B through the switches SW5B and SW 6B.

The inverter 6A converts the dc voltage received from the low-voltage side winding 4A into a three-phase ac voltage, and outputs the three-phase ac voltage to the motor MA. Inverter 6B converts the dc voltage received from low-voltage side winding 4B into a three-phase ac voltage, and outputs the three-phase ac voltage to motor MB.

The motor MA rotates in accordance with the three-phase ac voltage received from the inverter 6A. Further, the motor MB rotates in accordance with the three-phase ac voltage received from the inverter 6B.

Fig. 11(a) is a cross-sectional view of a window portion of the transformer showing current and magnetic flux generated in the dc section. Fig. 11(b) is a graph showing leakage magnetic flux generated in the core in the dc section. In fig. 11(b), the vertical axis shows the magnitude of the leakage magnetic flux F.

When a direct current flows through the low-voltage side windings 4A and 4B, the main fluxes FLA and FLB generated do not change, and therefore no inductance is generated. However, when the dc current flowing through the low-voltage side windings 4A and 4B includes a pulsating current component, i.e., an ac component, a leakage flux F as shown in fig. 11(B) is generated in the core 14, and inductance can be obtained. That is, the ac component included in the dc current flowing through the low-voltage side windings 4A and 4B can be attenuated. Further, the transformer apparatus 101 can be operated as an inverter, that is, harmonic components generated when generating three-phase alternating current from direct current can be attenuated.

However, since the transformer apparatus shown in fig. 7 does not include the switch SW3, a closed circuit including the high-voltage side windings 13A and 13B connected in parallel is formed. Accordingly, as shown in fig. 11(a), a leakage flux FLLKA is generated by an ac component of the current flowing through the low-voltage side winding 4A, and a current IHLKA flows through the high-voltage side winding 13A by the leakage flux FLLKA. Leakage magnetic flux FLLKB is generated by an ac component of the current flowing through the low-voltage side winding 4B, and a current IHLKB flows through the high-voltage side winding 13B by the leakage magnetic flux FLLKB.

Then, leakage magnetic fluxes FHLKA and FHLKB are generated by these currents IHLKA and IHLKB, respectively. Then, the leakage magnetic fluxes FHLKA and FHLKB cancel each other out, and therefore, the inductances in the low-voltage-side windings 4A and 4B are reduced.

Therefore, the transformer apparatus according to the embodiment of the present invention can solve the above-described problem by a configuration including the switch SW 3.

Fig. 12 is a diagram showing the setting of each switch in the dc section of the ac/dc electric train according to the embodiment of the present invention.

Fig. 13 is a cross-sectional view of the transformer showing the current and magnetic flux generated in the dc section. Fig. 14(a) is a cross-sectional view of a window portion of the transformer showing current and magnetic flux generated in the dc section. Fig. 14(b) is a graph showing leakage magnetic flux generated in the core in the dc section. In fig. 14(b), the vertical axis shows the magnitude of the leakage magnetic flux F.

Referring to fig. 12 to 14, in the dc section, switch SW3 is off. Thereby, the parallel connection of the high-voltage side windings 13A and 13B is released, and a closed circuit including the high-voltage side winding 13A and the high-voltage side winding 13B is not formed. Accordingly, currents IHLKA and IHLKB can be prevented from flowing through the high-voltage side windings 13A and 13B due to leakage magnetic fluxes FLLKA and FLLKB generated in the low-voltage side windings 4A and 4B. That is, since the leakage magnetic fluxes FHLKA and FHLKB can be prevented from being generated in the high-voltage side windings 13A and 13B, the leakage magnetic fluxes FLLKA and FLLKB can be prevented from being cancelled, and a large inductance can be obtained in the low-voltage side windings 4A and 4B.

Fig. 15 is a graph showing the dependence of inductance on current.

The curve G1 shows the case where magnetic saturation occurs in the core. In the graph G1, the inductance changes with the current flowing through the low-voltage side windings 4A and 4B.

In the transformer 51, a magnetic flux is generated by an alternating current which is a pulse component of a current flowing through the low-voltage side windings 4A and 4B. With this configuration, since the generated magnetic flux does not change with the change in the dc current flowing through the low-voltage side windings 4A and 4B, an inductance having a stable current dependency as shown by the curve G2 can be obtained.

In addition, in the ac/dc electric vehicle, although two types of devices, i.e., an ac section device such as a transformer and a dc section device such as a reactor device, are required, it is sometimes difficult to install the two types of devices in a limited space such as under a floor of a vehicle body.

However, in the transformer apparatus according to the embodiment of the present invention, since the low-voltage side winding can be shared as a DC reactor by adding several switches to the transformer for the ac section, it is not necessary to separately dispose the reactor apparatus from the transformer, and miniaturization can be achieved. In the transformer apparatus according to the embodiment of the present invention, the low-voltage side winding 4A and the low-voltage side winding 4B are provided so that magnetic flux generated by current flowing through the low-voltage side winding 4A when voltage is supplied from the overhead wire 1 via the switch SW2A and magnetic flux generated by current flowing through the low-voltage side winding 4B when voltage is supplied from the overhead wire 1 via the switch SW2B cancel each other out. With this configuration, since the magnetic saturation of the core 14 in the dc section can be prevented, a stable output can be obtained. Further, measures for reducing the leakage flux into the vehicle of the ac/dc electric train are not required, and the weight and cost of the ac/dc electric train can be reduced.

Therefore, in the transformer device according to the embodiment of the present invention, in the ac/dc electric vehicle, the transformer serving as the device for the ac section is operated in the ac section, and the reactor serving as the device for the dc section is operated in the dc section, so that the installation space of the vehicle body can be reduced. In addition, stable output can be obtained in both the dc section and the ac section.

The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. It is to be noted that the scope of the present invention is shown by the claims, not by the above description, and it includes all modifications within the meaning and scope equivalent to the claims.

Claims (6)

1. A transformer device is characterized by comprising

1 st high-voltage side winding (3),

A 1 st low-voltage side winding (4A) magnetically coupled to the 1 st high-voltage side winding (3),

A 2 nd low-voltage side winding (4B) magnetically coupled to the 1 st high-voltage side winding (3), and

a 1 st switch (SW1, SW2A, SW2B) for switching whether the voltage supplied from the outside is supplied to the 1 st low voltage side winding (4A) and the 2 nd low voltage side winding (4B) or the 1 st high voltage side winding (3),

the 1 st low voltage side winding (4A) and the 2 nd low voltage side winding (4B) are provided such that, when a voltage is supplied through the 1 st switch (SW1, SW2A, SW2B), a magnetic flux generated by a current flowing through the 1 st low voltage side winding (4A) and a magnetic flux generated by a current flowing through the 2 nd low voltage side winding (4B) cancel each other out.

2. The transforming device of claim 1,

the 1 st high-voltage side winding (3) includes:

a 2 nd high-voltage side winding (13A), the 2 nd high-voltage side winding (13A) being provided between the 1 st low-voltage side winding (4A) and the 2 nd low-voltage side winding (4B) at a position opposing the 1 st low-voltage side winding (4A) and magnetically coupled to the 1 st low-voltage side winding (4A); and

and a 3 rd high-voltage side winding (13B) that is connected in parallel with the 2 nd high-voltage side winding (13A), is provided between the 1 st low-voltage side winding (4A) and the 2 nd low-voltage side winding (4B) at a position facing the 2 nd low-voltage side winding (4B), and is magnetically coupled to the 2 nd low-voltage side winding (4B).

3. The transforming device of claim 2,

the transformer device (101) further comprises

A 2 nd switch (SW3) connected between the 2 nd high voltage side winding (13A) and the 3 rd high voltage side winding (13B).

4. The transforming device of claim 1,

the voltage transformation device (101) further comprises:

a core (14), the core (14) having a 1 st side surface, a 2 nd side surface opposite to the 1 st side surface, and 2 window portions (W1, W2) penetrating from the 1 st side surface to the 2 nd side surface,

the 1 st high voltage side winding (3), the 1 st low voltage side winding (4A) and the 2 nd low voltage side winding (4B) are disposed to pass through the 2 windows (W1, W2).

5. The transforming device of claim 1,

the transformer device (101) further comprises

A 1 st converter (5A) for converting the AC voltage appearing in the 1 st low-voltage side winding (4A) into a DC voltage,

A 2 nd converter (5B) for converting the AC voltage appearing in the 2 nd low-voltage side winding (4B) into a DC voltage,

A 3 rd switch (SW4A, SW5A) for switching whether to connect or disconnect the 1 st low voltage side winding (4A) and the 1 st inverter (5A), and

a 4 th switch (SW4B, SW5B) that switches whether to connect or disconnect the 2 nd low voltage side winding (4B) and the 2 nd inverter (5B).

6. The transforming device of claim 5,

the transformer device (101) further comprises

A 1 st inverter (6A) for converting the received DC voltage into AC voltage, and

a 2 nd inverter (6B) for converting the received DC voltage into an AC voltage,

the 3 rd switch (SW4A, SW5A) switches whether to connect the 1 st low-voltage side winding (4A) with the 1 st converter (5A) or to connect the 1 st low-voltage side winding (4A) with the 1 st inverter (6A),

the 4 th switches (SW4B, SW5B) switch whether to connect the 2 nd low-voltage side winding (4B) and the 2 nd converter (5B) or to connect the 2 nd low-voltage side winding (4B) and the 2 nd inverter (6B).