CN217477100U - Eddy current braking excitation power supply - Google Patents

Abstract

The utility model relates to an eddy current braking excitation power supply, which at least comprises two groups of power supply systems, wherein the input ends of the two groups of power supply systems share one input main power interface, and the input ends of the two groups of power supply systems are respectively connected with a direct current bus of a vehicle traction system through the input main power interface; the output ends of the two groups of power supply systems are electrically isolated, the output end of one group of power supply systems is connected with the eddy current braking device of one bogie on the vehicle through the first output main power interface, and the output end of the other group of power supply systems is connected with the eddy current braking device of the other bogie on the vehicle through the second output main power interface. The utility model provides an excitation power supply only can satisfy the power supply demand to a bogie of train, not only bulky, the structure is complicated, and the power device loss is big moreover, leads to the technical problem of braking system inefficiency.

Description

Eddy current braking excitation power supply

Technical Field

The utility model relates to a rail vehicle braking technical field, it is further, relate to an eddy current braking excitation power supply, especially relate to an excitation power supply that is used for high-speed train eddy current braking system.

Background

Among various technologies for braking rail vehicles, linear eddy current braking is a non-adhesive braking technology, eddy current braking force is not limited by wheel-rail adhesion conditions of vehicles, and eddy current braking can be used as an additional supplement to electric braking and friction braking, so that the technology is a key for further increasing the speed of high-speed motor train units.

A complete set of eddy current braking system comprises an eddy current braking device, an eddy current control unit and an excitation power supply. The eddy current brake device is a final execution component for generating braking force, and mainly comprises an electromagnet, a dowel bar and a support lever, wherein the electromagnet comprises a magnet yoke beam, a coil assembly, an electrical connecting piece and the like. When eddy current brake is applied, the exciting power supply outputs exciting current to the coil assembly to form alternately arranged N-S poles on the coil assembly, and the alternate magnetic poles and the steel rail move relatively to produce eddy current in the surface of the steel rail and form braking force in the direction opposite to and parallel to the vehicle moving direction and attraction force perpendicular to the vehicle moving direction. In the process, the eddy current brake control unit calculates a required current value according to the braking force request and the vehicle running state, and sends the current value to the excitation power supply; the excitation power supply is connected with direct current from the middle link of a traction converter in a vehicle traction system, continuously adjustable current (direct current) is output to the eddy current braking device according to the received required current value, meanwhile, the excitation power supply monitors the electrical state of the eddy current braking device in real time, and the actual value of the output current, the excitation power supply and the state of the eddy current braking device are fed back to the eddy current control unit.

In addition, the input side of the excitation power supply used by the conventional vehicle (such as a train) usually adopts a semiconductor device with a withstand voltage as high as 6.5kV, which causes large loss, and the switching frequency is usually controlled below 1kHz in order to reduce the loss, and under such a condition, the transformer needs to adopt a larger volume and a larger weight.

Aiming at the problem that an excitation power supply in the prior art can only meet the power supply requirement of one bogie of a train, and the problem that the braking system is low in efficiency due to large volume, complex structure and large loss of power devices is solved, an effective solution is not provided at present.

Therefore, the inventor provides an eddy current braking excitation power supply by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an eddy current braking excitation power supply can satisfy the power supply demand of two bogies simultaneously, when reducing the volume, simplifying the structure, guarantees to provide stable, continuous eddy current brake force for the vehicle, improves braking system's efficiency, promotes the braking capacity of vehicle.

The purpose of the utility model can be realized by adopting the following modes:

the utility model provides an eddy current braking excitation power supply, the eddy current braking excitation power supply at least comprises two groups of power supply systems, the input ends of the two groups of power supply systems share one input main power interface, and the input ends of the two groups of power supply systems are respectively connected into a direct current bus of a vehicle traction system through the input main power interface; the output ends of the two groups of power supply systems are electrically isolated, the output end of one group of power supply system is connected with the eddy current braking device of one bogie on the vehicle through a first output main power interface, and the output end of the other group of power supply system is connected with the eddy current braking device of the other bogie on the vehicle through a second output main power interface.

In a preferred embodiment of the present invention, the eddy current braking excitation power supply further includes a case, the power supply system is disposed in the case, and the input main power interface, the first output main power interface, and the second output main power interface are all disposed on the case; the top of machine case is provided with the spandrel girder, the spandrel girder assembly in on the vehicle.

The present invention provides a preferred embodiment, the case is provided with a control interface for receiving and sending control signals and a communication interface for communication, and the control interface and the communication interface are respectively connected to the power supply system.

The present invention provides a power supply system, which comprises an input module, a dc conversion module and an output module, wherein the input module is connected to the input main power interface, and the output module is connected to the output main power interface.

In a preferred embodiment of the present invention, the input module, the dc conversion module and the output module in the two sets of power supply systems are disposed in a central symmetry manner in the case, and the first output main power interface and the second output main power interface are disposed on two opposite sidewalls of the case respectively.

In a preferred embodiment of the present invention, the eddy current braking excitation power supply further includes a first fan and a second fan, which are respectively two sets of the power supply system for heat dissipation, and the first fan and the second fan are relatively disposed on two opposite outer walls of the case 1.

In a preferred embodiment of the present invention, the input end of the input module is connected to the dc bus of the vehicle traction system through the input main power interface, and the input module is provided with a fuse, an input contactor and a first filter on the power transmission line.

In a preferred embodiment of the present invention, the input module further includes a pre-charging circuit connected in parallel with the input contactor, and the pre-charging circuit is connected in series with a resistor and a pre-charging switch.

In a preferred embodiment of the present invention, the dc conversion module includes a plurality of series resonance conversion units, each of the series resonance conversion units includes a resonance inverter, a transformer and a rectifier, and the resonance inverters in each of the series resonance conversion units are connected in series and connected to an output terminal of the input module to form a primary side for equally dividing a bus voltage;

the rectifiers in each series resonance conversion unit are connected in parallel and connected with the input end of the output module to form a secondary side of a single output voltage;

a transformer is arranged between the resonant inverter and the corresponding rectifier in each series resonant conversion unit, and the primary side and the secondary side are electrically isolated while transforming voltage.

In a preferred embodiment of the present invention, the dc conversion module includes a buck converter, and the buck converter is disposed on the power transmission line between the secondary side and the input end of the output module.

In a preferred embodiment of the present invention, the output end of the output module passes through the first output main power interface or the second output main power interface and the power supply of the eddy current braking device are connected, and the output module is provided with a second filter and an output contactor on the power transmission line.

From above, the utility model discloses an eddy current braking excitation power supply's characteristics and advantage are: the utility model discloses an eddy current braking excitation power supply includes two sets of power supply system at least, input main power interface is shared to two sets of power supply system's input, and two sets of power supply system's input is respectively through input main power interface access vehicle traction system's direct current generating line, and two sets of power supply system's output is connected with the eddy current braking device's of two bogies on the vehicle through first output main power interface and second output main power interface respectively power, thereby can satisfy the power supply demand of two bogies simultaneously, not only reduce the volume, simplify the structure, and can guarantee to provide stability for the vehicle, continuous eddy current brake power, improve braking system's efficiency, promote the braking capability of vehicle.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

FIG. 1: one of the structural schematic diagrams of the eddy current braking excitation power supply of the present invention is shown.

FIG. 2 is a schematic diagram: is the second structural schematic diagram of the eddy current braking excitation power supply of the present invention.

FIG. 3: do the utility model discloses the bottom view of eddy current braking excitation power supply.

FIG. 4 is a schematic view of: is a connection circuit diagram of the eddy current braking excitation power supply and the eddy current braking device of the utility model.

FIG. 5 is a schematic view of: the circuit structure diagram of the single-unit power supply system in the eddy current braking excitation power supply of the utility model is adopted.

FIG. 6: the flow chart of the eddy current braking excitation power supply control method of the utility model is shown.

The utility model provides an reference numeral does:

1. a chassis; 2. A spandrel girder;

3. a first fan; 4. A control interface;

5. a communication interface; 6. An input main power interface;

7. a second output main power interface; 8. A second fan;

9. a first output main power interface; 10. An input module;

101. a fuse; 102. An input contactor;

103. a first filter; 104. A precharge circuit;

1041. a resistance; 1042. A pre-charging switch;

11. a DC conversion module; 111. A series resonance conversion unit;

1111. a resonant inverter; 1112. A transformer;

1113. a rectifier; 112. A buck converter;

113. a capacitor; 12. An output module;

121. a second filter; 122. An output contactor;

13. a direct current bus; 14. An eddy current brake device;

15. a bogie; 16. A power supply system.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 to 4, the present invention provides an eddy current braking excitation power supply, which at least includes two sets of power supply systems 16, the input ends of the two sets of power supply systems 16 share one input main power interface 6, and the input ends of the two sets of power supply systems 16 are respectively connected to the dc bus 13 of the vehicle traction system through the input main power interface 6; the outputs of the two groups of power supply systems 16 are electrically isolated, and the output of one group of power supply systems 16 is connected to the load of the eddy current braking device 14 of one bogie 15 on the vehicle via the first output main power interface 9, and the output of the other group of power supply systems 16 is connected to the load of the eddy current braking device 14 of the other bogie 15 on the vehicle via the second output main power interface 7.

The utility model provides an input main power interface 6 is shared to two sets of power supply system 16's input, and two sets of power supply system 16's input is respectively through the direct current generating line 13 that input main power interface 6 inserted vehicle traction system (namely: the input of two sets of power supply system 16 is parallelly connected inserts the direct current generating line 13 of input vehicle traction system), and two sets of power supply system 16's output is connected with the load of the eddy current braking device of two bogies 15 on the vehicle through first output main power interface 9 and second output main power interface 7 respectively, consequently, the utility model discloses a two sets of power supply system 16 can be simultaneously from the middle direct current link of input vehicle traction system in traction converter get the electricity, provide continuously adjustable exciting current for the electro-magnet of the eddy current braking device on two bogies 15 simultaneously, satisfy the power supply demand. The utility model discloses an eddy current braking excitation power supply not only reduces the volume, simplifies the structure, can guarantee moreover to provide stable, continuous eddy current brake force for the vehicle, improves braking system's efficiency, promotes the braking capability of vehicle.

In an optional embodiment of the present invention, as shown in fig. 1 and fig. 2, the eddy current braking excitation power supply further includes a case 1, the power supply system 16 is disposed in the case 1, and the input main power interface 6, the first output main power interface 9, and the second output main power interface 7 are disposed on the case 1; the two sides of the top of the case 1 are respectively provided with a bearing beam 2 extending along the horizontal direction, and the bearing beams 2 are assembled on a vehicle. The weight of the excitation power supply is borne by the bearing beam 2, and stable installation of the excitation power supply is guaranteed.

Further, as shown in fig. 1 and fig. 2, a control interface 4 and a communication interface 5 are arranged on the chassis 1, the control interface 4 is connected with a controller of the entire vehicle or a controller of another system on the vehicle, and two groups of power supply systems 16 are connected with the control interface 4, and the power supply systems 16 receive and send control signals through the control interface 4; the communication interface 5 is connected with an MVB bus and/or an Ethernet of the vehicle, the two groups of power supply systems 16 are connected with the communication interface 5, and the power supply systems 16 transmit communication information with the outside through the communication interface 5.

In an optional embodiment of the present invention, as shown in fig. 3, each group of power supply systems 16 includes an input module 10, a dc conversion module 11 and an output module 12, the input end of the input module 10 in two groups of power supply systems 16 is connected to the input main power interface 6, the output end of the input module 10 in two groups of power supply systems 16 is connected to the input end of the corresponding dc conversion module 11, and the output module 12 in two groups of power supply systems 16 is connected to the first output main power interface 9 and the second output main power interface 7 respectively.

Further, as shown in fig. 3, the input module 10, the dc conversion module 11, and the output module 12 of the two sets of power supply systems 16 are disposed in the chassis 1 in a central symmetry manner, and the first output main power interface 9 and the second output main power interface 7 are disposed on two opposite sidewalls of the chassis 1 respectively, which not only facilitates the disassembly, assembly, and maintenance of each set of power supply systems 16, but also has a more reasonable layout, facilitates the simplification of the structure, reduces the volume, and enables the two sets of power supply systems 16 to work independently in the chassis 1 without affecting each other.

Further, as shown in fig. 1 and 2, the eddy current braking excitation power supply further includes a first fan 3 and a second fan 8, the first fan 3 and the second fan 8 are oppositely disposed on two opposite outer walls of the case 1 (located outside the case 1), and the two sets of power supply systems 16 are respectively cooled by the first fan 3 and the second fan 8.

In an optional embodiment of the present invention, as shown in fig. 5, the input end of the input module 10 is connected to the dc bus 13 of the vehicle traction system through the input main power interface 6, and the fuse 101, the input contactor 102 and the first filter 103 are sequentially arranged on the transmission line of the input module 10 from the input end to the direction of the dc conversion module 11. The input end of the input module 10 obtains power from the dc bus 13, the input voltage Vin is a traction dc bus voltage, and then the traction dc bus voltage is filtered by the first filter 103, and the filtered dc power is output to the dc conversion module 11.

Further, the first filter 103 may be, but is not limited to, an EMC inductor.

Further, as shown in fig. 5, the input module 10 further includes a precharge circuit 104 connected in parallel with the input contactor 102, a resistor 1041 and a precharge switch 1042 are connected in series to the precharge circuit 104, and a capacitor 13 is disposed on the power line of the dc conversion module 11. Before the excitation power supply starts operating, it is necessary to open the input contactor 102 and close the precharge switch 1042, and the precharge circuit 104 precharges the excitation power supply, and then the input contactor 102 and the precharge switch 1042 are closed and the power is continuously transmitted to the dc conversion module 11.

In an optional embodiment of the present invention, as shown in fig. 5, the dc conversion module 11 includes a plurality of series resonance conversion units 111, each series resonance conversion unit 111 includes a resonance inverter 1111, a transformer 1112, and a rectifier 1113, and the resonance inverters 1111 of the series resonance conversion units 111 are connected in series and connected to the output end of the input module 10 to form a primary side for equally dividing the bus voltage; the rectifiers 1113 in each series resonant conversion unit 111 are connected in parallel and to the input of the output module 12 to form the secondary side of a single output voltage; a transformer 1112 is provided between the resonant inverter 1111 and the corresponding rectifier 1113 in each series resonant conversion unit 111, and electrically isolates the primary side from the secondary side while transforming the voltage.

Further, the transformer 1112 may be, but is not limited to, an intermediate frequency transformer.

In an embodiment of the present invention, as shown in fig. 5, the number of the series resonance converting units 111 is 4, and each series resonance converting unit 111 includes a resonance inverter 1111, a transformer 1112 and a rectifier 1113, the 4 resonance inverters 1111 are connected in series for equally dividing the input voltage Vin provided by the dc bus 13, and the input voltage of each series resonance converting unit 111 is equally divided into Vin/4; the series resonant conversion unit 111 employs an intermediate frequency transformer to electrically isolate the primary side and the secondary side of the dc conversion module 11. The 4 rectifiers 1113 are connected in parallel, thereby converting into a dc voltage Vdclink for output.

Further, as shown in fig. 5, the dc conversion module 11 includes a buck converter 112, and the buck converter 112 is disposed on the power transmission line between the secondary side and the input terminal of the output module 12. The dc voltage Vdclink is reduced by the buck converter 112 and then output to the output module 12.

Further, the buck converter 112 may be, but is not limited to, a three-level buck converter.

In an embodiment of the present invention, as shown in fig. 5, the output end of the output module 12 is connected to the load of the eddy current braking device 14 through the first output main power interface 9 or the second output main power interface 7, and the second filter 121 and the output contactor 122 are sequentially arranged on the transmission line of the output module 12 from the dc conversion module 11 to the output end direction. After being filtered by the second filter 121, the output voltage Vout (i.e., the dc voltage finally output by each group of power supply systems 16) is output, and the output current is constant-current and continuously adjustable.

Further, the second filter 121 may be, but is not limited to, an EMC inductor.

The utility model discloses a primary side of eddy current braking excitation power adopts four identical resonance inverters 1111 to establish ties, input voltage's 1/4 among the input module 10 input voltage Vin is equallyd divide to each way series resonance transform unit 111, thereby can choose for use withstand voltage to be 1.7 kV's semiconductor device, thereby can promote switching frequency to more than 20kHz, consequently, transformer 1112's volume and weight can reduce by a wide margin, under the same power grade, compare in traditional power frequency transformer, the weight of the intermediate frequency transformer that eddy current braking excitation power adopted of the application can reduce to about ten minutes.

As shown in fig. 6, the method for controlling the eddy current braking excitation power supply of the present invention includes the following steps:

step S1: after the excitation power supply is electrified, the excitation power supply carries out parameter initialization, and the excitation power supply enters a standby state after the initialization;

if the excitation power supply is in a standby state and has a fault (which can be but is not limited to a short circuit and/or open circuit fault occurring in a power transmission line), the excitation power supply enters a fault state; and after the fault is eliminated, the excitation power supply enters the standby state again.

Further, the fault state refers to that the electrical characteristics of the excitation power supply, such as overcurrent, overvoltage, overtemperature, short circuit and disconnection, inside the power supply or the eddy current braking device (load) exceed the designed values, the state of a component is abnormal, or the communication between the excitation power supply and other controllers is abnormal, and is collectively referred to as a fault state. After the excitation power supply enters a fault state, preset corresponding protection actions (including but not limited to shutdown, partial shutdown, disconnection of electrical connection with a traction converter or an eddy current brake device and the like) can be executed according to the fault.

Step S2: if the effective input voltage is detected in the standby state, the excitation power supply enters a pre-charging state;

the range of the effective input voltage may be preset according to the voltage regulation capability of the excitation power supply and the current required by the eddy current braking device, and if the voltage output to the power supply system 16 through the dc bus 13 is within the preset voltage range, the voltage may be determined as the effective input voltage.

If the excitation power supply is in a pre-charging state and has a fault (which can be but is not limited to a short circuit and/or open circuit fault occurring in a power transmission line), the excitation power supply enters a fault state; and after the fault is eliminated, the excitation power supply enters the standby state again.

Step S3: after the pre-charging of the excitation power supply is finished, entering a waiting state;

if the excitation power supply is in a waiting state and has a fault (which can be but is not limited to a short circuit and/or open circuit fault occurring in a power transmission line), the excitation power supply enters a fault state; and after the fault is eliminated, the excitation power supply enters the standby state again.

And if the excitation power supply detects invalid input voltage in the waiting state, the excitation power supply enters the standby state again. The range of the invalid input voltage may be preset according to the voltage regulation capability of the excitation power supply and the current required by the eddy current braking device, and if the voltage output to the power supply system 16 through the dc bus 13 is not within the preset voltage range, the invalid input voltage may be determined.

Step S4: and if the target current instruction is received in the waiting state, the excitation power supply enters a power supply state.

And if the excitation power supply detects invalid input voltage in the power supply state, the excitation power supply enters the standby state again.

If the target current instruction received by the excitation power supply does not meet the preset requirement (namely, the target current cannot be responded), the excitation power supply enters the waiting state again.

In the above process, if the excitation power supply receives the target current command, it needs to determine whether the excitation power supply has a condition for responding to the target current command (the condition can be preset), and then performs the next action according to the determination result.

The utility model discloses in the control process to excitation source be promptly to the control process of every group power supply system 16 in the excitation source, and then control the eddy current arresting gear's of the bogie of vehicle difference respectively braking state.

The utility model discloses an eddy current braking excitation power supply's characteristics and advantage are:

the eddy current braking excitation power supply at least comprises two groups of power supply systems 16, the input ends of the two groups of power supply systems 16 share one input main power interface 6, and the output ends of the two groups of power supply systems 16 are respectively connected with the power supplies of the eddy current braking devices of two bogies on a vehicle through a first output main power interface 9 and a second output main power interface 7, so that the power supply requirements of the two bogies can be met simultaneously, the size is reduced, the structure is simplified, stable and continuous eddy current braking force can be guaranteed to be provided for the vehicle, the efficiency of the braking system is improved, and the braking capability of the vehicle is improved.

Two, in this eddy current braking excitation power supply, the semiconductor configuration at the secondary side of series resonance converting unit 111 adopts three level buck converter, has adopted the interleaved switch technique (it is a soft switching technique, can optimize output current's ripple characteristic, the utility model discloses well three level buck converter has used this control technique promptly), can effectively improve output current's ripple characteristic, reduces output current's ripple.

In the eddy current braking excitation power supply, the four resonant inverters 1111 are connected in series on the primary side of the series resonance conversion unit 111, and the transformer 1112 is used for forming electrical isolation between the primary side and the secondary side of the series resonance conversion unit 111, so that the voltage to ground on the secondary side can be reduced to be less than half of that on the primary side, and the voltage to ground on the specific secondary side can be designed according to the actual requirements of the eddy current braking device, thereby reducing the insulation withstand voltage level of the eddy current braking device, effectively solving the problem that the eddy current braking device is difficult to adapt to overhigh voltage to ground in a traction direct current medium voltage link, improving the feasibility and manufacturability of the design and production of the eddy current braking electromagnet, improving the quality of the eddy current braking device product and prolonging the service life of the eddy current braking device.

The output current ripple of the eddy current braking excitation power supply is reduced, so that the purpose of reducing the ripple of the output current is achieved without increasing the inductance of the EMC inductor, the size and the weight of the EMC inductor are reduced, and the size and the weight of the excitation power supply are reduced. In addition, the primary side of the series resonance conversion unit 111 in the eddy current braking excitation power supply is connected in series by four resonance inverters 1111, and the input voltage of the input module 10 is equally divided, so that a low-voltage semiconductor device can be used, the switching frequency is improved, a transformer with smaller volume and lighter weight can be used, the weight of the transformer can be reduced to one tenth of the same type of products, and the weight of the excitation power supply can be reduced to one half of the traditional same type of products.

In the eddy current braking excitation, the main power switch tube on the primary side of the series resonance conversion unit 111 and the rectifier 1113 on the secondary side realize the soft switching technology (which is a control technology for semiconductor switch devices; the utility model discloses in owing to be provided with devices such as resonance inverter 1111, etc., can form resonance in the circuit, so the control process can make the switch turn on before voltage drop to zero earlier, turn off before the electric current drop to zero earlier, thereby reduce switching loss), can reduce the switching loss of power device by the at utmost, effectively improve system efficiency.

And sixthly, two groups of independent power supply systems 16 are arranged in the eddy current braking excitation power supply, so that the braking forces of two bogies 15 of the vehicle can be respectively controlled, when the eddy current braking device of one bogie 15 or a power supply loop of the eddy current braking device fails, the normal work of the eddy current braking device of the other bogie 15 is not influenced, the loss of the eddy current braking force of the whole vehicle is avoided, the availability of the eddy current braking force is effectively ensured, and the safety of the eddy current braking system is improved.

The above description is only illustrative of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims (11)

1. The eddy current braking excitation power supply is characterized by at least comprising two groups of power supply systems, wherein the input ends of the two groups of power supply systems share one input main power interface, and the input ends of the two groups of power supply systems are respectively connected to a direct current bus of a vehicle traction system through the input main power interface; the output ends of the two groups of power supply systems are electrically isolated, the output end of one group of power supply system is connected with the eddy current braking device of one bogie on the vehicle through a first output main power interface, and the output end of the other group of power supply system is connected with the eddy current braking device of the other bogie on the vehicle through a second output main power interface.

2. An eddy current braking excitation power supply according to claim 1, wherein the eddy current braking excitation power supply further comprises a chassis, the power supply system is disposed in the chassis, and the input main power interface, the first output main power interface, and the second output main power interface are all disposed on the chassis; the top of machine case is provided with the spandrel girder, the spandrel girder assembly in on the vehicle.

3. An eddy current brake excitation power supply according to claim 2, wherein a control interface for receiving and sending control signals and a communication interface for communication are provided on the case, and the control interface and the communication interface are respectively connected with the two sets of power supply systems.

4. An eddy current braking excitation power supply according to claim 2, wherein each of the power supply systems comprises an input module, a dc conversion module and an output module, wherein the input terminals of the input modules in both of the power supply systems are connected to the input main power interface, the output terminals of the input modules in both of the power supply systems are respectively connected to the input terminals of the corresponding dc conversion modules, and the output modules in both of the power supply systems are respectively connected to the first output main power interface and the second output main power interface.

5. An eddy current braking excitation power supply according to claim 4, wherein the input module, the dc conversion module and the output module of the two sets of power supply systems are arranged in the chassis in a central symmetry manner, and the first main output power interface and the second main output power interface are respectively arranged on two opposite side walls of the chassis.

6. An eddy current braking excitation power supply according to claim 5, wherein the eddy current braking excitation power supply further comprises a first fan and a second fan for respectively cooling the two sets of power supply systems, and the first fan and the second fan are oppositely arranged on two opposite outer walls of the case.

7. An eddy current brake excitation power supply according to claim 4, wherein the input end of the input module is connected to a dc bus of the vehicle traction system through the input main power interface, and a fuse, an input contactor and a first filter are provided on a power transmission line of the input module.

8. An eddy current brake exciter power supply according to claim 7, wherein the input module further comprises a pre-charge circuit connected in parallel with the input contactor, the pre-charge circuit having a resistor and a pre-charge switch connected in series.

9. An eddy current braking excitation power supply according to claim 4 wherein the dc conversion module comprises a plurality of series resonant conversion units, each of which comprises a resonant inverter, a transformer and a rectifier, the resonant inverters in each of the series resonant conversion units being connected in series and connected to the output of the input module to form a primary side that averages the bus voltage;

the rectifiers in each series resonance conversion unit are connected in parallel and are connected with the input end of the output module to form a secondary side of a single output voltage;

a transformer is arranged between the resonance inverter and the corresponding rectifier in each series resonance conversion unit, and the primary side and the secondary side are electrically isolated while transforming voltage.

10. An eddy current braking excitation power supply according to claim 9 wherein the dc conversion module comprises a buck converter provided on the power line between the secondary side and the input of the output module.

11. An eddy current brake excitation power supply according to claim 4, wherein the output end of the output module is connected with the power supply of the eddy current brake device through the first output main power interface or the second output main power interface, and a second filter and an output contactor are arranged on the power transmission line of the output module.

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