A traction control power supply circuit for a maglev train

Abstract

The present invention discloses a traction control power supply circuit for a maglev train, and relates to the field of train control. A traction system power supply circuit is provided, wherein the control circuit is capable of disconnecting the circuit between the high-voltage power supply grid and the traction main circuit upon receiving a power supply switching instruction, and connecting the circuit between the backup battery and the traction main circuit, so that when the high-voltage power supply grid is unable to supply power to the traction main circuit, the backup battery can supply power to the traction main circuit so that the traction main circuit performs traction control on the maglev train. It can be seen that in the present application, by switching the power supply between the backup battery and the high-voltage power supply grid, not only is timely traction power supply to the traction main circuit guaranteed, but the design cost of the track and the maglev train is also relatively low, and the maintenance difficulty is also relatively low, thereby improving the traction power supply efficiency of the traction main circuit and the operating efficiency of the maglev train.

Description

Technical Field

[0001] The present invention relates to the field of train control, and in particular to a traction control power supply circuit for a maglev train. Background Art

[0002] Low- and medium-speed maglev trains are a new type of rail transit vehicle that utilizes electromagnetic force for contactless support and guidance between the train and the track, and utilizes the electromagnetic force generated by linear induction motors for traction and braking. Currently, the traction system of low- and medium-speed maglev trains is powered by a 1500V or 750V DC high-voltage power grid, which the train receives from the supply and return rails via current collectors. However, if power to the supply and return rails is interrupted, the maglev train cannot continue its traction and must wait for power to be restored.

[0003] In addition, the maintenance line and stop line areas of the track are areas where the maglev train needs to stop running, and power supply rails and return rails are usually not laid. When the maglev train needs to leave the maintenance line and stop line, due to the lack of high-voltage power supply, the maglev train cannot be towed by itself and can only be towed away from the maintenance line and stop line by other power vehicles. If power supply rails and return rails are set on the maintenance line and stop line, on the one hand, it will bring certain safety risks to the maintenance operations in the depot and increase the difficulty of safety management; on the other hand, it will also cause the structural complexity of the maintenance line and stop line in the depot, affect the efficiency of the maintenance operations, and at the same time increase the construction cost of the track line. Summary of the Invention

[0004] The purpose of the present invention is to provide a traction control power supply circuit for a maglev train. By switching the power supply between a backup battery and a high-voltage power supply grid, not only is timely power supply to the traction main circuit ensured, but the design cost of the track and the maglev train is also relatively low, the maintenance difficulty is also relatively low, and the power supply efficiency of the traction main circuit and the operating efficiency of the maglev train are improved.

[0005] To solve the above technical problems, the present invention provides a traction control power supply circuit for a maglev train, comprising a backup battery, a high-voltage power supply grid, a traction system power supply circuit, a traction main circuit, and a control circuit; the output end of the backup battery is connected to a first input end of the traction system power supply circuit, the output end of the high-voltage power supply grid is connected to a second input end of the traction system power supply circuit, the output end of the traction system power supply circuit is connected to an input end of the traction main circuit, the output end of the control circuit is connected to a first communication end of the traction main circuit, and the second communication end of the traction main circuit is connected to a control end of the traction system power supply circuit;

[0006] The control circuit is configured to control the disconnection of the circuit between the high-voltage power supply grid and the traction main circuit in the traction system power supply circuit upon receiving a power supply switching instruction, and to send a power supply switching signal to the traction main circuit;

[0007] The traction main circuit is used to control the circuit conduction between the backup battery and the traction main circuit according to the power supply switching signal, and to perform traction control on the maglev train based on the traction power supply of the backup battery.

[0008] Preferably, the traction system power supply circuit includes:

[0009] A first end is connected to the output end of the backup battery, a second end is connected to the input end of the traction main circuit, and a control end is a contactor of the control end of the traction system power supply circuit, and is used to connect the circuit between the backup battery and the traction main circuit when closed;

[0010] A high-voltage control switch having a first end connected to the output end of the high-voltage power supply grid and a second end connected to the input end of the traction main circuit is used to disconnect the circuit between the high-voltage power supply grid and the traction main circuit when disconnected.

[0011] Preferably, the high-voltage control switch is a high-speed circuit breaker;

[0012] The control circuit comprises:

[0013] A backup battery traction mode switch having a first end connected to the positive electrode of the vehicle control power supply and a second end connected to the first end of the backup battery traction mode relay coil, configured to close upon receiving the power supply switching instruction;

[0014] The backup battery traction mode relay coil has a second end connected to the negative electrode of the vehicle control power supply, and is configured to be energized when the backup battery traction mode switch is closed;

[0015] A normally closed contact of a backup battery traction mode relay coil having a first end connected to the positive electrode of the vehicle control power supply and a second end connected to the first end of the high-speed circuit breaker coil, and configured to be disconnected when the backup battery traction mode relay coil is energized;

[0016] The high-speed circuit breaker coil having a second end connected to the negative electrode of the vehicle control power supply, and configured to lose power when the normally closed contact of the backup battery traction mode relay coil is disconnected, thereby disconnecting the high-speed circuit breaker;

[0017] A train network control system whose input end is connected to the backup battery traction mode switch and whose output end is connected to the traction main circuit is used to send the power supply switching signal to the traction main circuit when it is detected that the backup battery traction mode switch is closed.

[0018] Preferably, the third communication terminal of the traction main circuit is connected to the control terminal of the high-speed circuit breaker, and is also used to control the high-speed circuit breaker to disconnect when receiving the power supply switching signal.

[0019] Preferably, the traction main circuit includes a traction inverter and a traction motor, and the traction inverter includes a transmission control unit;

[0020] The first communication terminal of the transmission control unit is the first communication terminal of the traction main circuit, the second communication terminal is the second communication terminal of the traction main circuit, and the third communication terminal is the third communication terminal of the traction main circuit, and is used to control the contactor to close, the high-speed circuit breaker to open, and the traction inverter to invert the DC power output by the backup battery to power the traction motor when receiving the power supply switching signal;

[0021] The traction motor is used to perform traction control on the maglev train based on the traction power supply of the backup battery.

[0022] Preferably, the transmission control unit is further configured to send the input current and input voltage of the traction inverter and the input current of the traction motor to the train network control system, and control the traction inverter and the traction motor to stop working when receiving a stop working signal;

[0023] The train network control system is further configured to send the stop operation signal to the transmission control unit when it is determined that a fault occurs in the traction main circuit based on the input current and input voltage of the traction inverter and the input current of the traction motor.

[0024] Preferably, it also includes:

[0025] The input end is connected to the output end of the backup battery, and the output end is connected to the first input end of the traction system power supply circuit.

[0026] Preferably, it also includes:

[0027] A fuse having a first end connected to the output end of the backup battery and a second end connected to the first input end of the traction system power supply circuit.

[0028] Preferably, the backup battery includes a battery and a battery management system;

[0029] The battery management system is used to monitor the health status of the battery, and the battery is used to provide traction power to the traction main circuit when the circuit between the backup battery and the traction main circuit is conductive.

[0030] Preferably, the first input terminal of the control circuit is connected to the battery management system, and the second input terminal is connected to the traction main circuit;

[0031] The control circuit is further configured to, upon receiving the power supply switching instruction, control the disconnection of the circuit between the high-voltage power supply grid and the traction main circuit in the traction system power supply circuit, and then, based on the monitoring of the health status of the battery by the battery management system, determine whether the battery is operating normally and whether the traction main circuit has disconnected the traction power supply from the high-voltage power supply grid; and if so, send the power supply switching signal to the traction main circuit.

[0032] The present application provides a traction control power supply circuit for a maglev train, which relates to the field of train control. By setting up a traction system power supply circuit, the control circuit can disconnect the circuit between the high-voltage power supply grid and the traction main circuit upon receiving a power supply switching instruction, and connect the circuit between the backup battery and the traction main circuit, so that when the high-voltage power supply grid is unable to supply power to the traction main circuit, the backup battery can supply power to the traction main circuit so that the traction main circuit can perform traction control on the maglev train. It can be seen that in the present application, by switching the power supply between the backup battery and the high-voltage power supply grid, not only is timely traction power supply to the traction main circuit ensured, but the design cost of the track and the maglev train is also relatively low, and the maintenance difficulty is also relatively low, thereby improving the traction power supply efficiency of the traction main circuit and the operating efficiency of the maglev train. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic structural diagram of a traction control power supply circuit for a maglev train provided by the present invention;

[0035] Figure 2 This is a schematic diagram of the specific structure of a traction control power supply circuit for a maglev train provided by the present invention. DETAILED DESCRIPTION

[0036] The core of the present invention is to provide a maglev train traction control power supply circuit. By switching the power supply between a backup battery and a high-voltage power supply grid, it not only ensures timely power supply to the traction main circuit, but also reduces the design cost of the track and the maglev train, and reduces the difficulty of maintenance, thereby improving the power supply efficiency of the traction main circuit and the operating efficiency of the maglev train.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0038] Please refer to Figure 1 , Figure 1 This is a schematic structural diagram of a traction control power supply circuit for a maglev train provided by the present invention. The circuit includes a backup battery 1, a high-voltage power supply grid 2, a traction system power supply circuit 3, a traction main circuit 4, and a control circuit 5. The output end of the backup battery 1 is connected to a first input end of the traction system power supply circuit 3, the output end of the high-voltage power supply grid 2 is connected to a second input end of the traction system power supply circuit 3, the output end of the traction system power supply circuit 3 is connected to an input end of the traction main circuit 4, the output end of the control circuit 5 is connected to a first communication end of the traction main circuit 4, and the second communication end of the traction main circuit 4 is connected to a control end of the traction system power supply circuit 3.

[0039] The control circuit 5 is used to control the circuit between the high-voltage power supply grid 2 and the traction main circuit 4 in the traction system power supply circuit 3 to be disconnected upon receiving the power supply switching instruction, and to send a power supply switching signal to the traction main circuit 4;

[0040] The traction main circuit 4 is used to control the circuit conduction between the backup battery 1 and the traction main circuit 4 according to the power supply switching signal, and to perform traction control on the maglev train based on the traction power supply of the backup battery 1.

[0041] Considering that in the prior art, when a maglev train is located at a position where no power supply rail and return rail are provided, or when the power supply to the power supply rail and return rail is interrupted, the maglev train cannot be towed and operated, the solution is to lay power supply rails and return rails on the entire track, or to tow the train with a trailer. However, on the one hand, this will increase the cost, and on the other hand, it is inconvenient to find a suitable trailer for towing.

[0042] In order to solve the above technical problems, a backup battery 1, a high-voltage power supply grid 2, a traction system power supply circuit 3, a traction main circuit 4 and a control circuit 5 are set up in this application. When the train is running on the power supply rail and the return rail, it is powered by the high-voltage power supply grid 2. When the train cannot be powered by the high-voltage power supply grid 2, it can be switched to being powered by the backup battery 1 to achieve traction power supply within the entire track range.

[0043] Specifically, when the power supply mode needs to be switched, the staff can issue a power switching instruction to the control circuit 5. At this time, the control circuit 5 will disconnect the circuit between the high-voltage power supply grid 2 and the traction main circuit 4 in the traction system power supply circuit 3 to disconnect the power supply of the high-voltage power supply grid 2, or only disconnect the circuit when the high-voltage power supply grid 2 cannot supply power, and control the circuit conduction between the backup battery 1 and the traction main circuit 4 through the traction main circuit 4, and the backup battery 1 will provide traction power to ensure the traction control of the maglev train by the traction main circuit 4.

[0044] The supply voltage of the high-voltage power supply grid 2 may be, but is not limited to, DC1500V or DC750V.

[0045] In summary, in this application, the power supply switching between the backup battery 1 and the high-voltage power supply grid 2 not only ensures timely power supply to the traction main circuit 4, but also reduces the design cost of the track and the maglev train, and reduces the maintenance difficulty, thereby improving the power supply efficiency of the traction main circuit 4 and the operating efficiency of the maglev train.

[0046] Based on the above embodiment:

[0047] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the specific structure of a traction control power supply circuit for a maglev train provided by the present invention.

[0048] As a preferred embodiment, the traction system power supply circuit 3 includes:

[0049] The first end is connected to the output end of the backup battery 1, the second end is connected to the input end of the traction main circuit 4, and the control end is a contactor at the control end of the traction system power supply circuit 3, which is used to connect the circuit between the backup battery 1 and the traction main circuit 4 when closed;

[0050] A high-voltage control switch, whose first end is connected to the output end of the high-voltage power supply grid 2 and whose second end is connected to the input end of the traction main circuit 4, is used to disconnect the circuit between the high-voltage power supply grid 2 and the traction main circuit 4 when disconnected.

[0051] In this embodiment, the contactor K1 in the traction system power supply circuit 3 is responsible for controlling the on-off connection between the backup battery 1 and the traction main circuit 4, and the high-voltage control switch is responsible for controlling the on-off connection between the high-voltage power supply grid 2 and the traction main circuit 4. The control circuit 5 can disconnect the circuit between the high-voltage power supply grid 2 and the traction main circuit 4 by controlling the high-voltage control switch to be disconnected, while the traction main circuit 4 controls the circuit between the backup battery 1 and the traction main circuit 4 to be connected by controlling the contactor K1 to be closed, so that the backup battery 1 provides traction power to the traction main circuit 4.

[0052] It should be noted that the traction main circuit 4 can also perform simple control operations when there is no traction power supply from the backup battery 1 or the high-voltage power supply grid 2, but the power is not sufficient to achieve traction control of the train.

[0053] As a preferred embodiment, the high-voltage control switch is a high-speed circuit breaker QF1;

[0054] The control circuit 5 includes:

[0055] A backup battery traction mode switch S having a first end connected to the positive electrode of the vehicle control power supply and a second end connected to the first end of the backup battery traction mode relay coil, configured to close upon receiving a power supply switching instruction;

[0056] The backup battery traction mode relay coil K2 has a second end connected to the negative electrode of the vehicle control power supply, and is used to be energized when the backup battery traction mode switch S is closed;

[0057] The first end is connected to the positive electrode of the vehicle control power supply, and the second end is connected to the first end of the high-speed circuit breaker coil, and the normally closed contact K2 of the backup battery traction mode relay coil is used to disconnect when the backup battery traction mode relay coil K2 is energized;

[0058] A high-speed circuit breaker coil QF1 having a second end connected to the negative electrode of the vehicle control power supply, for de-energizing when the normally closed contact K2 of the backup battery traction mode relay coil is disconnected, thereby disconnecting the high-speed circuit breaker QF1;

[0059] The train network control system has an input end connected to the backup battery traction mode switch S and an output end connected to the traction main circuit 4, and is used to send a power supply switching signal to the traction main circuit 4 when it detects that the backup battery traction mode switch S is closed.

[0060] In this embodiment, by providing a backup battery traction mode switch S, the driver can control the backup battery traction mode switch S to be turned on or off to send a power supply switching instruction. When the backup battery traction mode switch S is closed, the backup battery traction mode relay coil K2 is energized accordingly, thereby controlling the high-speed circuit breaker coil QF1 to be de-energized. By setting the high-voltage control switch to the high-speed circuit breaker QF1, the high-speed circuit breaker coil QF1 in the control circuit 5 is controlled by the power gain and loss of power, so as to timely disconnect the circuit between the high-voltage power supply grid 2 and the main traction circuit 4, thereby improving control efficiency.

[0061] It can be seen that in this application, through the setting of relays and circuit breakers, no human intervention is required, which not only can realize the switching of traction power supply mode, but also has high intelligence, low cost and low operation difficulty.

[0062] As a preferred embodiment, the third communication terminal of the traction main circuit 4 is connected to the control terminal of the high-speed circuit breaker QF1, and is also used to control the high-speed circuit breaker QF1 to be disconnected when receiving the power supply switching signal.

[0063] In order to further ensure that the high-speed circuit breaker QF1 is completely disconnected, in this embodiment, the high-speed circuit breaker QF1 is also disconnected and controlled by software. Through the control method combining software and hardware, the isolation between the backup battery 1 and the high-voltage power supply grid 2 is ensured, thereby preventing the high-voltage power supply grid 2 from charging the backup battery 1 and causing damage to the backup battery 1, making it impossible to provide traction power to the traction main circuit 4.

[0064] As a preferred embodiment, the traction main circuit 4 includes a traction inverter and a traction motor, and the traction inverter includes a transmission control unit;

[0065] The first communication terminal of the transmission control unit is the first communication terminal of the traction main circuit 4, the second communication terminal is the second communication terminal of the traction main circuit 4, and the third communication terminal is the third communication terminal of the traction main circuit 4. The transmission control unit is used to control the contactor K1 to close, the high-speed circuit breaker QF1 to open, and the traction inverter to invert the DC power output by the backup battery 1 to power the traction motor when receiving the power supply switching signal.

[0066] The traction motor is used to perform traction control on the maglev train based on the traction power supply of the backup battery 1 .

[0067] In this embodiment, the transmission control unit in the traction inverter in the traction main circuit 4 mainly realizes the control function, and the traction inverter is mainly responsible for inverting the DC power output by the backup battery 1 or the high-voltage power supply grid 2 to power the traction motor, so that the traction motor can control the traction of the maglev train.

[0068] As a preferred embodiment, the transmission control unit is further configured to send the input current and input voltage of the traction inverter and the input current of the traction motor to the train network control system, and control the traction inverter and the traction motor to stop working when receiving a stop working signal;

[0069] The train network control system is further configured to send a stop operation signal to the transmission control unit when it is determined that a fault has occurred in the traction main circuit 4 based on the input current and input voltage of the traction inverter and the input current of the traction motor.

[0070] In this embodiment, the transmission control unit can also collect the input current, input voltage of the traction inverter and the input current of the traction motor, so that the train network control system can monitor whether the traction inverter and traction motor are working normally, and promptly control the traction inverter and traction motor to stop working when a fault occurs to avoid accidents.

[0071] As a preferred embodiment, the present invention further comprises:

[0072] The input end is connected to the output end of the backup battery 1 , and the output end is connected to the first input end of the traction system power supply circuit 3 , through the anti-reverse diode D1 .

[0073] In order to further isolate the high-voltage power supply grid 2 from the backup battery 1, in this embodiment, an anti-reverse diode D1 is further provided at the output end of the backup battery 1, so that the backup battery 1 can only output electrical energy from this output end, but the high-voltage power supply grid 2 cannot reversely charge the backup battery 1 from the output end of the backup battery 1.

[0074] As a preferred embodiment, the present invention further comprises:

[0075] A fuse F1 has a first end connected to the output end of the backup battery 1 and a second end connected to a first input end of the traction system power supply circuit 3 .

[0076] In order to prevent the backup battery 1 from discharging too much current, a fuse F1 is also provided at the output end of the backup battery 1. When the output current of the backup battery 1 is too large, the fuse F1 will melt, disconnecting the circuit between the backup battery 1 and the traction main circuit 4 to provide power protection for the backup battery 1.

[0077] As a preferred embodiment, the backup battery 1 includes a battery and a battery management system;

[0078] The battery management system is used to monitor the health status of the battery, and the battery is used to provide traction power to the traction main circuit 4 when the circuit between the backup battery 1 and the traction main circuit 4 is conductive.

[0079] The backup battery 1 in this embodiment includes a battery and a battery management system. The battery management system can monitor the health status of the battery to control the battery to provide traction power to the traction main circuit 4 in a healthy state, thereby protecting the backup battery 1.

[0080] As a preferred embodiment, the first input terminal of the control circuit 5 is connected to the battery management system, and the second input terminal is connected to the traction main circuit 4;

[0081] The control circuit 5 is also used to control the circuit disconnection between the high-voltage power supply grid 2 and the traction main circuit 4 in the traction system power supply circuit 3 when receiving the power supply switching instruction, and then judge whether the battery is working normally based on the battery management system's monitoring of the battery health status, and whether the traction main circuit 4 has disconnected the traction power supply from the high-voltage power supply grid 2; if so, send a power supply switching signal to the traction main circuit 4.

[0082] In this embodiment, the control circuit 5 also obtains the health status of the battery in the battery management system, such as the battery power level and temperature, to control the battery to provide traction power to the traction main circuit 4 when the battery is in a healthy state, thereby avoiding damage to the battery due to over-discharge. In addition, after the high-voltage power supply grid 2 is completely disconnected from the traction power supply, the battery will supply power to the traction main circuit 4 again, further protecting the battery power supply.

[0083] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0084] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A maglev train traction control power supply circuit, characterized in that: The system comprises a backup battery, a high-voltage power supply grid, a traction system power supply circuit, a traction main circuit, and a control circuit; the output end of the backup battery is connected to the first input end of the traction system power supply circuit, the output end of the high-voltage power supply grid is connected to the second input end of the traction system power supply circuit, the output end of the traction system power supply circuit is connected to the input end of the traction main circuit, the output end of the control circuit is connected to the first communication end of the traction main circuit, and the second communication end of the traction main circuit is connected to the control end of the traction system power supply circuit; The control circuit is configured to control the circuit between the high-voltage power supply grid and the traction main circuit in the traction system power supply circuit to be disconnected upon receiving a power supply switching instruction, and to send a power supply switching signal to the traction main circuit; The traction main circuit is used to control the circuit conduction between the backup battery and the traction main circuit according to the power supply switching signal, and to perform traction control on the maglev train based on the traction power supply of the backup battery; The traction system power supply circuit includes: A first end is connected to the output end of the backup battery, a second end is connected to the input end of the traction main circuit, and a control end is a contactor of the control end of the traction system power supply circuit, and is used to connect the circuit between the backup battery and the traction main circuit when closed; a high-voltage control switch having a first end connected to the output end of the high-voltage power supply grid and a second end connected to the input end of the traction main circuit, and configured to disconnect the circuit between the high-voltage power supply grid and the traction main circuit when disconnected; The high-voltage control switch is a high-speed circuit breaker; The control circuit comprises: A backup battery traction mode switch having a first end connected to the positive electrode of the vehicle control power supply and a second end connected to the first end of the backup battery traction mode relay coil, configured to close upon receiving the power supply switching instruction; The backup battery traction mode relay coil has a second end connected to the negative electrode of the vehicle control power supply, and is configured to be energized when the backup battery traction mode switch is closed; A normally closed contact of a backup battery traction mode relay coil having a first end connected to the positive electrode of the vehicle control power supply and a second end connected to the first end of the high-speed circuit breaker coil, configured to be disconnected when the backup battery traction mode relay coil is energized; The high-speed circuit breaker coil having a second end connected to the negative electrode of the vehicle control power supply, configured to lose power when the normally closed contact of the backup battery traction mode relay coil is disconnected, thereby disconnecting the high-speed circuit breaker; A train network control system having an input end connected to the backup battery traction mode switch and an output end connected to the traction main circuit, configured to send the power supply switching signal to the traction main circuit when detecting that the backup battery traction mode switch is closed; The third communication terminal of the traction main circuit is connected to the control terminal of the high-speed circuit breaker, and is further used to control the high-speed circuit breaker to open when receiving the power supply switching signal; The backup battery includes a battery and a battery management system; The battery management system is used to monitor the health status of the battery, and the battery is used to provide traction power to the traction main circuit when the circuit between the backup battery and the traction main circuit is conductive; The first input terminal of the control circuit is connected to the battery management system, and the second input terminal is connected to the traction main circuit; The control circuit is further configured to, upon receiving the power supply switching instruction, control the disconnection of the circuit between the high-voltage power supply grid and the traction main circuit in the traction system power supply circuit, and then, based on the monitoring of the health status of the battery by the battery management system, determine whether the battery is operating normally and whether the traction main circuit has disconnected the traction power supply from the high-voltage power supply grid; and if so, send the power supply switching signal to the traction main circuit.

2. The maglev train traction control power supply circuit according to claim 1, characterized in that: The traction main circuit includes a traction inverter and a traction motor, and the traction inverter includes a transmission control unit; The first communication terminal of the transmission control unit is the first communication terminal of the traction main circuit, the second communication terminal is the second communication terminal of the traction main circuit, and the third communication terminal is the third communication terminal of the traction main circuit, and is used to control the contactor to close, the high-speed circuit breaker to open, and the traction inverter to invert the DC power output by the backup battery to power the traction motor when receiving the power supply switching signal; The traction motor is used to perform traction control on the maglev train based on the traction power supply of the backup battery.

3. The maglev train traction control power supply circuit according to claim 2, characterized in that: The transmission control unit is further configured to send the input current and input voltage of the traction inverter and the input current of the traction motor to the train network control system, and control the traction inverter and the traction motor to stop working when receiving a stop working signal; The train network control system is further configured to send the stop operation signal to the transmission control unit when it is determined that a fault occurs in the traction main circuit based on the input current and input voltage of the traction inverter and the input current of the traction motor.

4. The maglev train traction control power supply circuit according to claim 1, characterized in that: Also includes: The input end is connected to the output end of the backup battery, and the output end is connected to the first input end of the traction system power supply circuit.

5. The maglev train traction control power supply circuit according to claim 1, characterized in that: Also includes: A fuse having a first end connected to the output end of the backup battery and a second end connected to the first input end of the traction system power supply circuit.

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