WO2024028947A1

WO2024028947A1 - Power supply device for railroad vehicle

Info

Publication number: WO2024028947A1
Application number: PCT/JP2022/029502
Authority: WO
Inventors: 英紀鈴木; 大樹川本
Original assignee: 三菱電機株式会社
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2024-02-08
Also published as: JPWO2024028947A1

Abstract

This power supply device (5) for a railroad vehicle is mounted onto a railroad vehicle (110) comprising a storage battery (9) and comprises a chopper circuit (21) disposed on the primary side of a transformer (28), a first inverter (24) disposed between the chopper circuit (21) and the transformer (28), a resonance circuit (25) disposed between the first inverter (24) and the transformer (28), and a second inverter (26) disposed between the transformer (28) and a direct current load (6). The chopper circuit (21) performs a step-down operation during a sound travel and performs a step-up operation during an emergency travel. The first inverter (24) converts a direct current voltage applied by the chopper circuit (21) into an alternating current voltage, and converts an alternating current voltage applied from the primary side of the transformer (28) into a direct current voltage. The second inverter (26) converts an alternating current voltage applied from the secondary side of the transformer (28) into a direct current voltage, and converts a direct current voltage applied by the storage battery (9) into an alternating current voltage.

Description

Power supply equipment for railway vehicles

The present disclosure relates to a power supply device for a railway vehicle mounted on a railway vehicle equipped with a storage battery.

Patent Document 1 below discloses that DC power supplied from a DC overhead line is converted to AC power by an inverter, insulated by an LC filter consisting of a reactor and a capacitor, and a commercial insulation transformer, and then used for supplementary purposes such as air conditioning equipment, display devices, etc. A power supply device for a railway vehicle that converts 50/60 [Hz] three-phase AC power or single-phase AC power required for a railway vehicle is disclosed. Note that auxiliary equipment is a name used to refer to equipment other than the propulsion motor among equipment mounted on a railway vehicle and supplied with electric power. Furthermore, in a railway vehicle, a power supply device that drives a propulsion motor is called a "main converter" or the like, and is provided separately from a power supply device that supplies power to auxiliary machines.

In addition, as a recent technological trend, there are railway vehicle systems that are equipped with storage batteries and are configured so that in emergencies such as overhead line power outages, the power from the storage batteries can be used to continue supplying power to auxiliary equipment.

JP2017-38424A

There is also a need to use the power from a storage battery that supplies power to auxiliary equipment in an emergency as power for emergency driving. However, the power flow in the power supply device that supplies power to the auxiliary equipment is unidirectional from the overhead wire to the auxiliary equipment, as is the case with the power supply device of Patent Document 1, and this need cannot be met. Can not.

The present disclosure has been made in view of the above, and an object of the present disclosure is to obtain a power supply device for a railway vehicle that can use the power of a storage battery that supplies power to auxiliary equipment as power for emergency running. shall be.

In order to solve the above-mentioned problems and achieve the objectives, a power supply device for a railway vehicle according to the present disclosure is mounted on a railway vehicle equipped with a storage battery, and includes a transformer that insulates a primary side and a secondary side. A power supply device for a railway vehicle includes a chopper circuit placed on the primary side of a transformer, a first inverter placed between the chopper circuit and the transformer, and a resonance capacitor that connects the first inverter and the transformer. The transformer includes a resonant circuit disposed between the transformer and the DC load, and a second inverter disposed between the transformer and the DC load. The chopper circuit performs a step-down operation when power is supplied from the overhead wire side, and performs a step-up operation when power is supplied from the storage battery side. The first inverter converts the DC voltage applied from the chopper circuit into AC voltage and applies it to the primary side of the transformer, and converts the AC voltage applied from the primary side of the transformer into DC voltage and applies it to the chopper circuit. do. The resonant circuit performs a series resonant operation using a capacitance component and an inductance component of a resonant capacitor. The second inverter converts the AC voltage applied from the secondary side of the transformer into a DC voltage and applies it to a DC load and a storage battery connected in parallel to the DC load, and converts the DC voltage applied from the storage battery into an AC voltage. Convert it to voltage and apply it to the secondary side of the transformer. A power supply device for a railway vehicle is configured to be able to supply power to auxiliary equipment using power from the overhead wires during normal running, and to use power from a storage battery to power the auxiliary equipment and the railway vehicle during emergency running. It is configured to be able to supply power to the main motor.

According to the power supply device for a railway vehicle according to the present disclosure, it is possible to utilize the power of the storage battery that supplies power to the auxiliary equipment as power for emergency running.

A diagram showing a configuration example of a railway vehicle system including a power supply device according to an embodiment. A diagram showing a configuration example of a power supply main circuit that is a main circuit of a power supply device according to an embodiment. A block diagram showing an example of a hardware configuration for realizing the functions of a control unit in an embodiment. A block diagram showing another example of the hardware configuration for realizing the functions of the control unit in the embodiment. A diagram showing the configuration of a power supply device according to modification 1 of the embodiment A diagram showing the configuration of a power supply device according to modification 2 of the embodiment A diagram showing the configuration of a power supply device according to modification 3 of the embodiment A diagram showing the configuration of a power supply device according to modification 4 of the embodiment

A power supply device for a railway vehicle (hereinafter appropriately abbreviated as "power supply device") according to an embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings. In the following explanation, the word "connection" includes both cases where components are directly connected to each other and cases where components are indirectly connected through other components. I'm here.

Embodiment.
FIG. 1 is a diagram showing a configuration example of a railway vehicle system 100 including a power supply device 5 according to an embodiment. The railway vehicle system 100 according to the embodiment includes a current collector 2 , a power converter 3 , a main motor 4 , a power supply device 5 , a DC load 6 , and a storage battery 9 . These components are mounted on the railway vehicle 110. The main electric motor 4 is a propulsion motor that provides propulsion to the railway vehicle 110.

The current collector 2 collects DC power from the overhead wire 1. The current collector 2 supplies the collected DC power to the power converter 3. The power conversion device 3 converts the DC power supplied from the current collector 2 into AC power to be supplied to the main motor 4 . As the power converter 3, a VVVF inverter is used that converts an applied DC voltage into an AC voltage of variable voltage and variable frequency.

Further, the current collector 2 supplies the collected DC power to the power supply device 5. The power supply device 5 converts the DC power supplied from the current collector 2 into DC power to be supplied to the DC load 6 . The DC load 6 includes an auxiliary machine 8.

As described above, the auxiliary machine 8 is a load other than the propulsion motor among the loads mounted on the railway vehicle 110. Examples of the auxiliary equipment 8 are an in-vehicle lighting device, a door opening/closing device, an air conditioner, a security device, a compressor, a storage battery, and a control power source. The storage battery 9 is a large-capacity power storage device, and is shown separately from the auxiliary device 8 in FIG. Among the auxiliary equipment 8, the in-vehicle lighting system, door opening/closing system, air conditioner, security equipment, compressor, etc. are loads that operate by receiving alternating current power, and the power supply to these loads is provided by three unillustrated systems. This is done via a phase inverter. In addition, among the auxiliary equipment 8, small-capacity storage batteries, control power supplies, etc. are loads that receive DC power, and power is supplied to these loads by a charger or a DC (Direct Current)/DC converter (not shown). etc.

The power supply device 5 according to the embodiment is configured to be able to supply power to the auxiliary equipment 8 using power from the overhead wire 1 during normal driving, and to supply power to the auxiliary equipment 8 using power from the storage battery 9 during emergency driving. and is configured to be able to supply power to the main motor 4. Healthy running means running when power is being supplied from the overhead wire 1, and emergency running means running when power is not being supplied from the overhead wire 1 due to, for example, a power outage.

During healthy running, power can be supplied from the overhead wire 1, so power is supplied to the auxiliary equipment 8 using the power from the overhead wire 1. On the other hand, during emergency running, since the power supply from the overhead wire 1 is interrupted, the power stored in the storage battery 9 is used to supply power to the auxiliary equipment 8, and the power stored in the storage battery 9 is used to power the main motor. By driving 4, emergency driving to the destination is carried out. Note that the emergency run by the power supply device 5 may be performed when the power conversion device 3, which is the main conversion device, breaks down. In this case, in the emergency running, the railroad vehicle 110 that has made an emergency stop can be moved to a location where it does not interfere with the operation of other railroad vehicles.

Although FIG. 1 shows an overhead wire as the overhead wire 1 and a pantograph-shaped current collector as the current collector 2, the present invention is not limited to these. The overhead wire 1 may be a third rail used in a subway or the like, and accordingly, the current collector 2 may be a current collector for the third rail. Further, although FIG. 1 shows a case where the overhead wire 1 is a DC overhead wire, the overhead wire 1 may be an AC overhead wire. In addition, when the overhead line 1 is an AC overhead line, a main transformer for stepping down the received AC voltage is provided downstream of the current collector 2, and an AC voltage outputted from the main transformer is installed downstream of the main transformer. A converter is provided to convert the alternating current voltage to a direct current voltage.

Next, a specific circuit configuration of the power supply device 5 according to the embodiment will be described. FIG. 2 is a diagram showing a configuration example of a power supply main circuit 20, which is a main circuit of the power supply device 5 according to the embodiment. Components that are the same as those in FIG. 1 are designated with the same reference numerals. As shown in FIG. 2, the power supply main circuit 20 includes a chopper circuit 21, a capacitor C1, a resonant DC/DC converter 22, and a control section 30. The resonant DC/DC converter 22 includes a first inverter 24 , a resonant circuit 25 , a transformer 28 , and a second inverter 26 .

The transformer 28 is an isolation transformer having a primary winding 28a and a secondary winding 28b that are magnetically coupled to each other. In this paper, the side connected to the primary winding 28a is referred to as the "primary side", and the side connected to the secondary winding 28b is referred to as the "secondary side".

The chopper circuit 21 is arranged on the primary side of the transformer 28. The chopper circuit 21 includes a first reactor L1, a first switching element Q11, and a second switching element Q12.

The first inverter 24 is arranged between the chopper circuit 21 and the transformer 28 on the primary side of the transformer 28. The first inverter 24 includes four third to sixth switching elements Q21 to Q24 connected in a bridge manner. The connection point between the third switching element Q21 and the fifth switching element Q23 is drawn out to form the first DC terminal 24a, and the connection point between the fourth switching element Q22 and the sixth switching element Q24 is drawn out to the outside and constitutes a second DC terminal 24b.

In the chopper circuit 21, one end of the first reactor L1 is connected to the first DC terminal 24a of the first inverter 24. One end of the first switching element Q11 is connected to the other end of the first reactor L1, and the other end is connected to the overhead wire 1 side. The second switching element Q12 has one end connected to the other end of the first reactor L1, and the other end connected to the second DC terminal 24b of the first inverter.

Between the chopper circuit 21 and the first inverter 24, the capacitor C1 has its positive side connected to the first DC terminal 24a, and its negative side connected to the second DC terminal 24b. The capacitor C1 connected in this manner is provided to smooth the DC voltage output from the chopper circuit 21 and the DC voltage output from the first inverter 24.

The resonant circuit 25 is arranged between the first inverter 24 and the transformer 28. The resonant circuit 25 includes a resonant capacitor C2 and a second reactor L2. The resonant circuit 25 performs series resonant operation with the capacitance component of the resonant capacitor C2 and the inductance component of the second reactor L2. That is, the second reactor L2 acts as an inductance component in the resonance circuit 25. Note that the leakage inductance of the transformer 28 may be used instead of the second reactor L2. In this case, the second reactor L2 can be omitted.

The second inverter 26 is arranged between the transformer 28 and the DC load 6 on the secondary side of the transformer 28. The second inverter 26 includes four seventh to tenth switching elements Q31 to Q34 connected in a bridge manner.

Examples of the first and second switching elements Q11, Q12, the third to sixth switching elements Q21 to Q24, and the seventh to tenth switching elements Q31 to Q34 are MOSFETs (Metal-Oxide-Semiconductor Field -Effect Transistor), but it may also be an IGBT (Insulated Gate Bipolar Transistor) or a transistor element other than IGBT.

The first and second switching elements Q11 and Q12, the third to sixth switching elements Q21 to Q24, and the seventh to tenth switching elements Q31 to Q34 each have diodes connected in antiparallel. Anti-parallel means that the first terminal corresponding to the drain of the MOSFET is connected to the cathode of the diode, and the second terminal corresponding to the source of the MOSFET is connected to the anode of the diode.

Furthermore, the first and second switching elements Q11, Q12, the third to sixth switching elements Q21 to Q24, and the seventh to tenth switching elements Q31 to Q34 are generally made of silicon (Si). ), but other materials such as silicon carbide (SiC), gallium nitride (GaN), gallium oxide (Ga ₂ O ₃ ), diamond, etc. It may also be formed using a wide bandgap semiconductor. If each switching element is formed of a wide bandgap semiconductor material, it is possible to achieve low loss and high-speed switching.

The control unit 30 generates a switching signal G11 for controlling the first and second switching elements Q11 and Q12 of the chopper circuit 21 based on a detection signal from a sensor (not shown), and outputs it to the chopper circuit 21. The control unit 30 also generates a switching signal G12 for controlling the third to sixth switching elements Q21 to Q24 of the first inverter 24 based on a detection signal from a sensor (not shown), and generates a switching signal G12 for controlling the third to sixth switching elements Q21 to Q24 of the first inverter 24. Output to the inverter 26. Further, the control unit 30 generates a switching signal G13 for controlling the seventh to tenth switching elements Q31 to Q34 of the second inverter 26 based on a detection signal from a sensor (not shown). Output to the inverter 26.

As described above, the power supply device 5 according to the embodiment is mounted on a railway vehicle 110 equipped with a storage battery 9, has a primary winding 28a and a secondary winding 28b that are magnetically coupled to each other, and has a primary winding and a secondary winding. This is a power supply device for a railway vehicle equipped with a transformer 28 that insulates the

Next, the operation of the power supply device 5 according to the embodiment will be described. The chopper circuit 21 performs a step-down operation or a through-operation when power is supplied from the overhead wire 1, and performs a step-up operation when power is supplied from the storage battery 9. That is, the chopper circuit 21 performs a step-down operation or a through-operation during normal driving, and performs a step-up operation during emergency driving. The through operation is an operation when the second switching element Q12 is always off, and the voltage of the overhead line 1 is not stepped down but is applied to the capacitor C1 via the first switching element Q11 and the first reactor L1. be done.

Note that in the step-down operation of the chopper circuit 21, the antiparallel-connected diodes ensure a current flow path, so the second switching element Q12 does not need to be turned on. On the other hand, synchronous rectification may be performed in which the second switching element Q12 is turned on at the timing when a current flows through the diodes connected in antiparallel. Since the voltage drop due to the on-resistance of the transistor is smaller than the forward voltage drop of the diode, loss in the chopper circuit 21 can be reduced by performing synchronous rectification.

The capacitor C1 smoothes and holds the DC voltage output from the chopper circuit 21. Further, the capacitor C1 smoothes and holds the DC voltage output from the first inverter 24.

The first inverter 24 converts the DC voltage applied from the chopper circuit 21 into an AC voltage and applies it to the primary side of the transformer 28, and converts the AC voltage applied from the primary side of the transformer 28 into a DC voltage. The voltage is applied to the chopper circuit 21. The first inverter 24 operates as an inverter circuit during healthy running, and operates as a rectifier circuit during emergency running.

During healthy running, the third to sixth switching elements Q21 to Q24 provided in the first inverter 24 operate so that the conduction rate of each becomes 50%. During this operation, the third to sixth switching elements Q21 to Q24 are two switching elements located diagonally to each other, that is, a set of the third and sixth switching elements Q21 and Q24, and a set of the fourth and sixth switching elements Q21 and Q24. The set of fifth switching elements Q22 and Q23 are turned on or off at the same time. Note that during switching control, due to variations in circuit operation, the switching elements of the set of third and fourth switching elements Q21 and Q22 and the set of fifth and sixth switching elements Q23 and Q24 connected in series may Needless to say, a dead time is provided to prevent them from being turned on at the same time. The conductivity rate of 50% described here means the conductivity rate before dead time is provided.

As described above, in the resonance circuit 25, a series resonance operation is performed between the capacitance component of the resonance capacitor C2 and the inductance component of the second reactor L2. Due to this series resonance operation, a resonance current flows through the resonance circuit 25. The third to sixth switching elements Q21 to Q24 are controlled so that the conduction rate of each is 50%, so that the ON operation of the set of third and sixth switching elements Q21 and Q24 and the fourth The ON operation of the fifth switching elements Q22 and Q23 can be switched using the zero point where the resonance current becomes zero. This operation is an example of a soft switching method and is called "zero current switching." Thereby, switching losses in the third to sixth switching elements Q21 to Q24 can be reduced, so that the operation loss of the first inverter 24 can be reduced.

Note that during emergency running, the power flow in the first inverter 24 is from the resonant circuit 25 to the chopper circuit 21, and the diodes connected in antiparallel ensure a current flow path. , the third to sixth switching elements Q21 to Q24 do not have to be turned on. On the other hand, synchronous rectification may be performed in which a corresponding switching element is turned on at the timing when a current flows through diodes connected in antiparallel. By performing synchronous rectification, loss in the first inverter 24 can be reduced.

Furthermore, during emergency running, the voltage applied to the capacitor C1 via the first inverter 24 is controlled by adjusting the boost rate of the chopper circuit 21. In this way, even when adjusting the voltage of the capacitor C1 to a desired voltage, the conductivity of the third to sixth switching elements Q21 to Q24 can be maintained at 50%. This makes it possible to reduce switching loss in the first inverter 24 even when adjusting the voltage of the capacitor C1 to a desired voltage.

The second inverter 26 converts the AC voltage applied from the secondary side of the transformer 28 into a DC voltage, applies it to the DC load 6 and the storage battery 9 connected in parallel to the DC load 6, and applies the voltage from the storage battery 9 to the DC load 6 and the storage battery 9 connected in parallel to the DC load 6. The DC voltage generated is converted into an AC voltage and applied to the secondary side of the transformer 28. The second inverter 26 operates as a rectifier circuit during healthy running, and operates as an inverter circuit during emergency running.

As explained above, the power supply device 5 according to the embodiment is configured to be able to supply power to the auxiliary equipment 8 using the power from the overhead wire 1 during healthy driving, and to supply power from the storage battery 9 during emergency driving. It is configured such that it can be used to supply power to the auxiliary machine 8 and the main motor 4 mounted on the railway vehicle 110. Thereby, the power supply device 5 according to the embodiment can use the power of the storage battery 9 that supplies power to the auxiliary equipment 8 as power for emergency driving.

FIG. 3 is a block diagram showing an example of a hardware configuration for realizing the functions of the control unit 30 in the embodiment. In order to realize the functions of the control unit 30 in the embodiment, as shown in FIG. The configuration may include an interface 304 that performs.

The processor 300 is an example of a calculation means. The processor 300 may be a calculation means called a microprocessor, microcomputer, microcontroller, CPU (Central Processing Unit), or DSP (Digital Signal Processor). The memory 302 also includes nonvolatile or volatile semiconductor memories such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (registered trademark) (Electrically EPROM); Examples include a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, and a DVD (Digital Versatile Disc).

The memory 302 stores a program that executes the functions of the control unit 30 in the embodiment. The processor 300 can perform the above-described processing by exchanging necessary information via the interface 304 and executing a program stored in the memory 302. The results of calculations by processor 300 can be stored in memory 302.

Furthermore, when realizing the functions of the control unit 30 in the embodiment, the configuration shown in FIG. 4 may be used. FIG. 4 is a block diagram showing another example of the hardware configuration for realizing the functions of the control unit 30 in the embodiment. In FIG. 4, the processor 300 and memory 302 shown in FIG. 3 are replaced with a processing circuit 303. The processing circuit 303 is a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. Information input to the processing circuit 303 and information output from the processing circuit 303 can be exchanged via the interface 304.

Next, a modification of the power supply device 5 according to the embodiment will be described. FIG. 5 is a diagram showing the configuration of a power supply device 5A according to modification example 1 of the embodiment. In FIG. 2, the configuration in which the power supply device 5 has one power supply main circuit 20 has been described, but in the power supply device 5A shown in FIG. 5, two power supply main circuits 20 are connected in parallel to the overhead wire 1 and the DC load 6. ing. Note that FIG. 5 is an example, and three or more power supply main circuits 20 may be connected in parallel.

In the configuration of the power supply device 5A shown in FIG. 5, interleaving operation is applied to the two power supply main circuits 20. The interleave operation is performed by shifting the phases from each other within one cycle of processing. For example, when the number of main power supply circuits 20 is two, the power supply main circuits 20 are operated with a phase shift of 180 degrees, and when the number of power supply main circuits 20 is four, they are operated with a phase shift of 90 degrees. When the main power supply circuit 20 is operated in an interleaved manner, the voltage ripple in the circuit can be reduced, so that the capacitance of the capacitor C1 can be reduced.

FIG. 6 is a diagram showing the configuration of a power supply device 5B according to a second modification of the embodiment. In FIG. 5, the chopper circuit 21, the first inverter 24, the resonance circuit 25, the transformer 28, and the second inverter 26 in the power supply main circuit 20 are all arranged in parallel, but as shown in FIG. Only two inverters 26 may be arranged in parallel. Even with this configuration, interleaving operation is possible, and the same effect as the power supply device 5A according to the first modification can be obtained.

Further, FIG. 7 is a diagram showing the configuration of a power supply device 5C according to modification 3 of the embodiment. In FIG. 6, only the second inverter 26 is arranged in parallel, but as shown in FIG. may be configured in parallel. Even with this configuration, interleaving operation is possible, and effects equivalent to those of the power supply device 5A according to the first modification and the power supply device 5B according to the second modification can be obtained.

Further, FIG. 8 is a diagram showing the configuration of a power supply device 5D according to a fourth modification of the embodiment. In FIG. 7, the chopper circuit 21, the first inverter 24, and the resonance circuit 25 are arranged in parallel, but as shown in FIG. 8, only the chopper circuit 21 may be arranged in parallel. Even with this configuration, interleaving operation is possible, and the same effect as the power supply device 5A according to modification example 1, the power supply device 5B according to modification example 2, and the power supply device 5C according to modification example 3 can be obtained. .

As described above, the power supply device for a railway vehicle according to the embodiment is mounted on a railway vehicle equipped with a storage battery, and includes a transformer that insulates the primary side and the secondary side. The power supply device includes a chopper circuit placed on the primary side of the transformer, a first inverter placed between the chopper circuit and the transformer, and a resonant capacitor placed between the first inverter and the transformer. and a second inverter placed between the transformer and the DC load. The chopper circuit performs a step-down operation when power is supplied from the overhead wire side, and performs a step-up operation when power is supplied from the storage battery side. The first inverter converts the DC voltage applied from the chopper circuit into AC voltage and applies it to the primary side of the transformer, and converts the AC voltage applied from the primary side of the transformer into DC voltage and applies it to the chopper circuit. do. The resonant circuit performs a series resonant operation using a capacitance component and an inductance component of a resonant capacitor. The second inverter converts the AC voltage applied from the secondary side of the transformer into a DC voltage and applies it to a DC load and a storage battery connected in parallel to the DC load, and converts the DC voltage applied from the storage battery into an AC voltage. Convert it to voltage and apply it to the secondary side of the transformer. With the above-mentioned components, the power supply device for railway vehicles is configured to be able to supply power to auxiliary equipment using power from overhead wires during normal running, and to use power from storage batteries to power auxiliary equipment during emergency running. and is configured to be able to supply power to the main electric motor mounted on the railway vehicle. This makes it possible to obtain a power supply device for a railway vehicle that can utilize the power of the storage battery that supplies power to the auxiliary equipment as power for emergency running.

In the above configuration, the chopper circuit includes a first reactor having one end connected to the first DC terminal of the first inverter, one end connected to the other end of the first reactor, and the other end connected to the overhead wire. a first switching element connected to the side, and a second switching element whose one end is connected to the other end of the first reactor and whose other end is connected to the second DC terminal of the first inverter. In addition, the second switching element can be configured to include diodes connected in antiparallel. In this configuration, when the chopper circuit performs a step-down operation, the second switching element may perform a synchronous rectification operation in which it is turned on at the timing when a current flows through the antiparallel-connected diodes. In this way, loss in the chopper circuit can be reduced.

Further, in the above configuration, the third to sixth switching elements provided in the first inverter operate so that each conduction rate becomes 50%, and the two switching elements located diagonally to each other The elements can be operated to turn on or off simultaneously. With this operation, switching losses in the third to sixth switching elements can be reduced, and the loss in the operation of the first inverter can be reduced.

Further, in the above configuration, a capacitor for smoothing the DC voltage output from the chopper circuit or the DC voltage output from the first inverter may be provided between the chopper circuit and the first inverter. I can do it. In this configuration, the voltage applied to the capacitor via the first inverter is controlled by adjusting the boost rate of the chopper circuit. In this way, even when adjusting the voltage of the capacitor C1 to a desired voltage, the conductivity of the third to sixth switching elements Q21 to Q24 can be maintained at 50%, so that the first inverter 24 can be reduced.

The configuration shown in the above embodiments is an example, and it is possible to combine it with another known technology, and a part of the configuration can be omitted or changed without departing from the gist. It is possible.

1 Overhead line, 2 Current collector, 3 Power conversion device, 4 Main motor, 5, 5A, 5B, 5C, 5D Power supply device, 6 DC load, 8 Auxiliary equipment, 9 Storage battery, 20 Main power supply circuit, 21 Chopper circuit, 22 Resonant DC/DC converter, 24 first inverter, 24a first DC terminal, 24b second DC terminal, 25 resonance circuit, 26 second inverter, 28 transformer, 28a primary winding, 28b secondary winding , 30 control unit, 100 railway vehicle system, 110 railway vehicle, 300 processor, 302 memory, 303 processing circuit, 304 interface, C1 capacitor, C2 resonant capacitor, G11 to G13 switching signal, L1 first reactor, L2 second Reactor, Q11 first switching element, Q12 second switching element, Q21 third switching element, Q22 fourth switching element, Q23 fifth switching element, Q24 sixth switching element, Q31 seventh switching element , Q32 eighth switching element, Q33 ninth switching element, Q34 tenth switching element.

Claims

A power supply device for a railway vehicle, which is mounted on a railway vehicle equipped with a storage battery and includes a transformer that insulates a primary side and a secondary side,
a chopper circuit that is disposed on the primary side of the transformer, performs a step-down operation when power is supplied from the overhead wire side, and performs a step-up operation when power is supplied from the storage battery side;
It is arranged between the chopper circuit and the transformer, converts the DC voltage applied from the chopper circuit into an AC voltage and applies it to the primary side of the transformer, and converts the AC voltage applied from the primary side of the transformer into an AC voltage. a first inverter that converts the DC voltage into a DC voltage and applies it to the chopper circuit;
a resonant circuit having a resonant capacitor, disposed between the first inverter and the transformer, and performing series resonant operation with a capacitance component and an inductance component of the resonant capacitor;
The transformer is disposed between the transformer and the DC load, and converts the AC voltage applied from the secondary side of the transformer into a DC voltage, and applies the DC voltage to the DC load and the storage battery connected in parallel to the DC load. , a second inverter that converts the DC voltage applied from the storage battery into AC voltage and applies it to the secondary side of the transformer;
Equipped with
When running in good condition, it is configured to use power from the overhead wires to supply power to auxiliary equipment.
A power supply device for a railway vehicle, characterized in that, during emergency running, power from the storage battery can be used to supply power to the auxiliary equipment and the main motor mounted on the railway vehicle.
The chopper circuit is
During healthy driving, it operates in step-down or through mode,
The power supply device for a railway vehicle according to claim 1, wherein the power supply device performs a step-up operation during emergency running.
The chopper circuit is
a first reactor having one end connected to a first DC terminal of the first inverter;
a first switching element having one end connected to the other end of the first reactor and the other end connected to the overhead wire side;
a second switching element, one end of which is connected to the other end of the first reactor, and the other end of which is connected to a second DC terminal of the first inverter,
The first and second switching elements each include diodes connected in antiparallel,
The railway vehicle according to claim 1 or 2, wherein the second switching element is turned on at a timing when a current flows through diodes connected in antiparallel when the chopper circuit performs a step-down operation. Power supply for.
comprising a second reactor disposed between the first inverter and the transformer,
The power supply device for a railway vehicle according to claim 1 or 2, wherein the second reactor acts as the inductance component in the resonant circuit.
The first inverter includes third to sixth switching elements connected in a full bridge,
The third to sixth switching elements each include diodes connected in antiparallel,
The first inverter is
During healthy driving, it operates as an inverter circuit,
The power supply device for a railway vehicle according to any one of claims 1 to 4, characterized in that it operates as a rectifier circuit during emergency running.
The third to sixth switching elements operate so that each conduction rate becomes 50%, and two switching elements located diagonally to each other are turned on or off at the same time. The power supply device for a railway vehicle according to claim 5.
a capacitor disposed between the chopper circuit and the first inverter that smoothes the DC voltage output from the chopper circuit or the DC voltage output from the first inverter;
The power supply device for a railway vehicle according to claim 6, wherein the voltage applied to the capacitor via the first inverter is controlled by adjusting a step-up rate of the chopper circuit.
The second inverter includes seventh to tenth switching elements connected in a full bridge,
The seventh to tenth switching elements each include a diode connected in antiparallel,
The second inverter is
Operates as a rectifier circuit during healthy driving,
The power supply device for a railway vehicle according to any one of claims 1 to 7, characterized in that it operates as an inverter circuit during emergency running.