CN220535414U - Train load power supply circuit and system - Google Patents
Train load power supply circuit and system Download PDFInfo
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- CN220535414U CN220535414U CN202321971057.7U CN202321971057U CN220535414U CN 220535414 U CN220535414 U CN 220535414U CN 202321971057 U CN202321971057 U CN 202321971057U CN 220535414 U CN220535414 U CN 220535414U
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Abstract
The utility model relates to the field of train power supply, and discloses a train load power supply circuit and a train load power supply system, wherein the train load power supply circuit comprises: the device comprises a state detection circuit, an energy storage device power supply unit and a storage battery power supply unit; the state detection circuit is connected with the train controller to acquire the working state information of the train, so that power is supplied to the train according to the working state information of the train; the state detection circuit is connected with the energy storage device power supply unit and the storage battery power supply unit to control the energy storage device power supply unit to supply power when the working state information is in a dormant state and control the storage battery power supply unit to supply power when the working state information is in an awakening state. According to the technical scheme, the energy storage device is used for supplying power when the train is in the dormant state, the capacity requirement of the storage battery is reduced, and therefore the power supply cost is reduced.
Description
Technical Field
The utility model relates to the field of train power supply, in particular to a train load power supply circuit and a train load power supply system.
Background
In the field of rail transit, in order to ensure that a train can normally run, energy needs to be provided for loads such as auxiliary equipment and the like carried by the train through a vehicle-mounted storage battery. The load carried in the train comprises a permanent load, a starting load and a conventional load, wherein the permanent load comprises standby electricity of a signal system, the starting load comprises power supply control electricity, signal system control electricity, network control electricity and train emergency lighting, and the conventional load comprises train low-voltage electricity loads such as passenger information systems, train normal lighting, traction auxiliary system control electricity, brake system electricity and the like.
With the development of trains, the types and the number of auxiliary equipment carried in the trains are also increasing, and the consumed energy is also increasing. Because the permanent load is in the working state when the train is in the dormant state and the working state, when the train enters the dormant state, the electric energy stored in the storage battery can be quickly consumed, and the normal working of the train is influenced. In order to ensure that the train in the dormant state can be started normally and the load carried by the train can operate normally, a vehicle-mounted storage battery with larger capacity is usually selected, so that the power supply cost of the train is increased.
Therefore, how to provide a power supply system for a train with lower cost to ensure the normal operation of load devices and the like mounted in the train is a problem to be solved by those skilled in the art.
Disclosure of Invention
The utility model aims to provide a train load power supply circuit and a train load power supply system, which are used for reducing the cost of the train load power supply circuit on the premise of ensuring normal operation of load equipment and the like mounted in a train.
In order to solve the technical problem, the application also provides a train load power supply circuit, which comprises:
the device comprises a state detection circuit, an energy storage device power supply unit and a storage battery power supply unit; the energy storage device power supply unit and the storage battery power supply unit are connected with a train permanent load;
the state detection circuit is connected with the train controller to acquire the working state information of the train;
the state detection circuit is connected with the energy storage device power supply unit and the storage battery power supply unit, so as to control the energy storage device power supply unit to supply power for the train permanent load when the working state information is in a dormant state, and control the storage battery power supply unit to supply power for the train permanent load when the working state information is in an awakening state.
Preferably, the energy storage device power supply unit includes: the energy storage device, the energy storage control unit, the voltage conversion unit and the energy storage power supply circuit;
the energy storage control unit is connected with the state detection circuit, so that power is supplied to the train permanent load when the working state information meets the preset condition;
the input end of the voltage conversion unit is connected with the energy storage device, the output end of the voltage conversion unit is connected with the first end of the energy storage power supply circuit, and the second end of the energy storage power supply circuit is connected with the train permanent load so as to output an electric signal under the control of the energy storage control unit.
Preferably, the battery power supply unit includes: the storage battery, the storage battery control unit and the storage battery power supply circuit;
the input end of the storage battery power supply circuit is connected with the storage battery, the control end of the storage battery power supply circuit is connected with the storage battery control unit, and the output end of the storage battery power supply circuit is connected with the train permanent load.
Preferably, the energy storage device power supply unit further comprises a first power supply circuit and a second power supply circuit;
the input end of the first power supply circuit is connected with the storage battery, and the input end of the second power supply circuit is connected with the output end of the voltage conversion unit;
the output end of the first power supply circuit and the output end of the second power supply circuit are connected with the energy storage control unit.
Preferably, the circuit further comprises a high-voltage output circuit;
the high-voltage output circuit comprises a high-voltage power supply circuit and a pre-charging circuit; the pre-charging circuit comprises a protection resistor;
the input end of the pre-charging circuit and the input end of the high-voltage power supply circuit are connected with the energy storage device, and the output end of the pre-charging circuit and the output end of the high-voltage power supply circuit are used as the output end of the high-voltage output circuit together.
Preferably, the battery power supply circuit includes: a contactor and a first diode;
the first end of the contactor is connected with the storage battery, the first end of the first diode is connected with the second end of the contactor, and the second end of the first diode is connected with the train permanent load.
Preferably, the train load power supply circuit further comprises an auxiliary converter;
the first output end of the auxiliary converter is connected with the storage battery; and a second output end of the auxiliary converter is connected with the energy storage device.
Preferably, the train load power supply circuit further comprises a protection circuit, a first end of the protection circuit is connected with the output end of the energy storage device, and a second end of the protection circuit is connected with the input end of the voltage conversion unit.
Preferably, the train load power supply circuit further includes: a power supply termination unit;
the first end of the power supply termination unit is connected with the state detection circuit, and the second end of the power supply termination unit is connected with the storage battery control unit so as to control the storage battery control unit to be closed when the working state information is detected to terminate power supply.
In order to solve the technical problem, the application further provides a train load power supply system which comprises the train load power supply circuit.
The application provides a train load power supply circuit, includes: the device comprises a state detection circuit, an energy storage device power supply unit and a storage battery power supply unit; the energy storage device unit and the storage battery unit are connected with a train permanent load; the state detection circuit is connected with the train controller to acquire the working state information of the train, so that power is supplied to the train according to the working state information of the train; the state detection circuit is connected with the energy storage device power supply unit and the storage battery power supply unit to control the energy storage device power supply unit to supply power to the train permanent load when the working state information is in the dormant state, and to control the storage battery power supply unit to supply power to the train permanent load when the working state information is in the awakening state. Therefore, according to the technical scheme, the energy storage device and the storage battery power supply unit are controlled to supply power to the permanent load of the train respectively according to the working state information of the train, and compared with the power supply by using the storage battery completely, the technical scheme provided by the application supplies power when the train is in the dormant state through the energy storage device, so that the capacity requirement of the storage battery is reduced, and the power supply cost is reduced.
In addition, the application also provides a train load power supply system which comprises the train load power supply circuit, and the effects are the same as the above.
Drawings
For a clearer description of embodiments of the present utility model, the drawings that are required to be used in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
Fig. 1 is a block diagram of a power supply circuit for a train load according to an embodiment of the present application;
fig. 2 is a block diagram of another power supply circuit for a train load according to an embodiment of the present application;
the reference numerals are as follows: the power supply device comprises a state detection circuit 1, an energy storage device power supply unit 2, a storage battery power supply unit 3, an energy storage device 4, an energy storage control unit 5, a voltage conversion unit 6, a storage battery 7, a storage battery control unit 8, a storage battery power supply circuit 9, an auxiliary converter 10, a protection circuit 11, a power supply termination unit 12, a first power supply circuit 13 and a second power supply circuit 14.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present utility model.
The core of the utility model is to provide a train load power supply circuit and a train load power supply system, so that the cost of the train load power supply circuit is reduced on the premise of ensuring normal operation of load equipment and the like mounted in a train.
The technical scheme provided by the utility model is applied to track traffic fields such as train. The energy storage device is a common facility in the field of rail transit, the early energy storage device is mainly used for ground energy storage, and along with popularization of application scenes such as a net-free area, aisle forks, emergency traction and the like, the technology of the energy storage device is rapidly developed. As a vehicle-mounted energy source, the energy storage device is used as a traction energy source to provide instant high power, so that the power requirement of the whole vehicle is met, and the regenerative braking energy can be recovered; as a standby emergency power traction source, the train passes through the no-net zone or the emergency cruising to the rescue zone under the working condition of no-net zone or contact net fault. Because the power is required to be supplied to the train, the capacity configuration of the energy storage device is generally far greater than that of the auxiliary storage battery of the train, and the quick charging characteristic of the energy storage device ensures that the energy storage device is in a full-charge state for a long time, namely the energy storage device can completely bear the emergency load power supply function of the traditional auxiliary storage battery, and if the auxiliary storage battery is still configured as the original, the capacity waste of the auxiliary storage battery is caused. In order to solve the problem, the energy storage device and the energy storage device power supply unit are controlled to supply power to the permanent load of the train respectively according to the working state information of the train.
In order to better understand the aspects of the present utility model, the present utility model will be described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a block diagram of a power supply circuit for a train load according to an embodiment of the present application, as shown in fig. 1, the power supply circuit for a train load provided in the present application includes:
a state detection circuit 1, an energy storage device power supply unit 2 and a storage battery power supply unit 3; the energy storage device unit and the storage battery unit are connected with a train permanent load;
the state detection circuit 1 is connected with a train controller to acquire the working state information of the train;
the state detection circuit 1 is connected with the energy storage device power supply unit 2 and the storage battery power supply unit 3, so as to control the energy storage device power supply unit 2 to supply power to the train permanent load when the working state information is in the dormant state, and control the storage battery power supply unit 3 to supply power to the train permanent load when the working state information is in the awakening state.
In a specific implementation, the state detection circuit 1 is connected with a control center of the train to acquire the working state information of the train, so that the energy storage device power supply unit 2 and the storage battery power supply unit 3 are controlled to supply power for a permanent load of the train according to the working state information of the train. It can be understood that the state detection circuit 1 can be an additionally arranged detection circuit, and can also directly multiplex the central control equipment of the train, and the latter scheme can further reduce the equipment cost.
After acquiring the working state information of the train, the state detection circuit 1 determines which power supply unit supplies power to the train according to the working state information. If the working state information is in the dormant state, the energy storage device power supply unit 2 enters the working state to supply power for the permanent load; and if the working state information is in the wake-up state, the storage battery power supply unit supplies power to the permanent load.
It should be noted that, in order to further provide stability of the train load power supply circuit, a communication unit may be further added between the energy storage device power supply unit 2 and the battery power supply unit 3, so as to implement the intercommunication of the working states of the two. When the working state needs to be switched, the power supply unit needing to be started sends the information of 'already started' to the power supply unit needing to be closed, and the other power supply unit stops supplying power after receiving the information of 'already started' for a threshold time. To prevent the situation that the permanent load is powered down due to errors in the handover process.
The application provides a train load power supply circuit, includes: the device comprises a state detection circuit, an energy storage device power supply unit and a storage battery power supply unit; the energy storage device unit and the storage battery unit are connected with a train permanent load; the state detection circuit is connected with the train controller to acquire the working state information of the train, so that power is supplied to the train according to the working state information of the train; the state detection circuit is connected with the energy storage device power supply unit and the storage battery power supply unit to control the energy storage device power supply unit to supply power to the train permanent load when the working state information is in the dormant state, and to control the storage battery power supply unit to supply power to the train permanent load when the working state information is in the awakening state. Therefore, according to the technical scheme, the energy storage device and the storage battery power supply unit are controlled to supply power to the permanent load of the train respectively according to the working state information of the train, and compared with the power supply by using the storage battery completely, the technical scheme provided by the application supplies power when the train is in the dormant state through the energy storage device, so that the capacity requirement of the storage battery is reduced, and the power supply cost is reduced.
Fig. 2 is a block diagram of another power supply circuit for a train load according to an embodiment of the present application, and as shown in fig. 2, a battery power supply unit 3 of the power supply circuit includes: a battery, a battery control unit 8, and a battery power supply circuit 9; the input end of the storage battery power supply circuit 9 is connected with a storage battery, the control end of the storage battery power supply circuit 9 is connected with the storage battery control unit 8, and the output end of the storage battery power supply circuit 9 is connected with a train permanent load.
In a specific implementation, KM represents a contactor, D represents a diode, QF represents a circuit breaker, FU represents a fuse, STRS represents use during maintenance of a fused maintenance switch, TA represents a current sensor, TV represents a voltage sensor, and LVDC represents the DC/DC voltage conversion unit 6 in a normally closed state.
As shown in fig. 2, the energy storage device has two outputs: one path is high-voltage output and is used for main power supply of a train, and at the moment, the energy storage device is responsible for traction power supply of the train and auxiliary load power supply; one path is low-voltage output and is used for supplying power to a permanent load in a train sleep mode. The low voltage output circuit of the energy storage device is the energy storage device power supply unit 2, and the circuit comprises: the energy storage device, the energy storage control unit 5, the voltage conversion unit 6 and the energy storage power supply circuit; the energy storage control unit 5 is connected with the state detection circuit 1 so as to supply power for the train permanent load when the working state information meets the preset condition; the input end of the voltage conversion unit 6 is connected with an energy storage device, the output end of the voltage conversion unit 6 is connected with the first end of an energy storage power supply circuit, and the second end of the energy storage power supply circuit is connected with a train permanent load so as to output an electric signal under the control of the energy storage control unit 5. In a specific implementation, the voltage conversion unit 6 selects a DC/DC conversion circuit to convert the output voltage of the energy storage device into an output voltage suitable for the permanent load, so as to supply power to the permanent load. The high-voltage output circuit comprises a high-voltage power supply circuit and a pre-charging circuit; the precharge circuit comprises a protection resistor; the input end of the pre-charging circuit and the input end of the high-voltage power supply circuit are connected with the energy storage device, and the output end of the pre-charging circuit and the output end of the high-voltage power supply circuit are used as the output end of the high-voltage output circuit. When the high-voltage circuit side contactor of the energy storage device is controlled by a train to be put into operation, when a train input instruction is received, the energy storage device control unit firstly closes a KM1 pre-charging branch to perform pre-charging, automatically closes a main loop contactor KM2 after the pre-charging is completed, and opens the pre-charging contactor KM1.
In the specific implementation, QF1 is in a normally closed state, and during normal power supply, an auxiliary storage battery or a charger supplies power to the energy storage device control unit and is powered through a low-voltage control electric interface at D1, so that the control unit works normally; under the sleep condition of the train, the power supply to the external 24V mainly provides standby power for a signal system, KA1 is closed in a parking sleep mode, the energy storage device outputs power to the outside through the low-voltage DC/DC voltage conversion unit 6, the power supply of the control unit is realized through the switching tube D3, at the moment, the control unit only keeps the fault monitoring function, the energy consumption is reduced, and the KA1 can be automatically disconnected when the fault is ensured.
In a specific implementation, the energy storage device power supply unit 2 further comprises a first power supply circuit 13 and a second power supply circuit 14; the input end of the first power supply circuit 13 is connected with a storage battery to supply power to the energy storage device power supply unit 2 through the storage battery, and the input end of the second power supply circuit 14 is connected with the output end of the voltage conversion unit 6. The output end of the first power supply circuit 13 and the output end of the second power supply circuit 14 are connected with the energy storage control unit 5 so as to supply power to the energy storage device control unit through the energy storage device. When the train is in a working state, the energy storage device is required to provide traction energy for the train, and at the moment, the storage battery supplies power for the energy storage control unit 5 through the first power supply circuit 13; when the train is converted from the working state to the dormant state, the energy storage device needs to output a low-voltage electric signal under the control of the energy storage control unit 5, so that the storage battery is still required to supply power to the energy storage control unit 5 through the first power supply circuit 13 at the moment; when the train is in a sleep state, the energy storage device supplies power to the energy storage control unit 5 through the second power supply circuit 14.
As shown in fig. 2, the auxiliary battery has three outputs, namely a conventional load, a start load and a permanent load. The auxiliary battery and the auxiliary converter 10 outputs are each configured with a current sensor and a voltage sensor accordingly. QF2 is in a normally closed state, the auxiliary storage battery is fed with F01 to realize self-power supply of the battery control unit, and after the self-detection is completed and the starting condition is met, the KM4 contactor is automatically closed to supply power to the starting load and the permanent load. Wherein, the D8 is used for avoiding the power supply to the starting load when the permanent load of the energy storage device supplies power, so that the energy storage device supplies power to the permanent load independently; the charging current of the auxiliary storage battery is controlled through D5 and D6, namely, the auxiliary storage battery can be charged only through D5. The battery power supply circuit 9 includes: a contactor KM4 and a diode D8; the first end of the contactor KM4 is connected with a storage battery, the first end of the diode D8 is connected with the second end of the contactor KM4, and the second end of the diode D8 is connected with a train permanent load so as to prevent the energy storage unit from supplying power to the storage battery through the storage battery power supply circuit 9.
As a preferred embodiment, the train load power supply circuit provided by the application further comprises an auxiliary converter 10; the first output end of the auxiliary converter 10 is connected with a storage battery; a second output of the auxiliary current transformer 10 is connected to an energy storage device. The auxiliary converter 10 is used for charging a storage battery and an energy storage device so as to ensure the normal operation of the train load.
As a preferred embodiment, the train load power supply circuit provided in the present application further includes a protection circuit 11, a first end of the protection circuit 11 is connected to an output end of the energy storage device, and a second end of the protection circuit 11 is connected to an input end of the voltage conversion unit 6. As shown in fig. 2, the protection circuit 11 includes a fused service switch. When a fault is detected, the fuse opens to stop supplying power to the train load.
It should be noted that, in addition to the sleep state and the wake state, there is a shutdown state of the train, that is, a state in which the train is left unused for a long time. In this case, it is necessary to terminate the power supply to the train load. In order to solve this problem, in the technical scheme that this application provided, train load power supply circuit still includes: a power supply termination unit 12; the first end of the power supply termination unit 12 is connected to the state detection circuit 1, and the second end of the power supply termination unit 12 is connected to the battery control unit 8 to control the battery control unit 8 to be turned off when the operation state information is detected as termination of power supply. As shown in fig. 2, the power supply termination unit 12 is a switch F01, and when it is detected that the operation state information is to terminate the power supply, the switch F01 is operated to stop the power supply to the control unit of the battery, so that the battery control unit 8 is turned off.
In addition, the application also provides a train load power supply system which comprises the train load power supply circuit. The train load power supply circuit includes: the device comprises a state detection circuit, an energy storage device power supply unit and a storage battery power supply unit; the energy storage device unit and the storage battery unit are connected with a train permanent load; the state detection circuit is connected with the train controller to acquire the working state information of the train, so that power is supplied to the train according to the working state information of the train; the state detection circuit is connected with the energy storage device power supply unit and the storage battery power supply unit to control the energy storage device power supply unit to supply power to the train permanent load when the working state information is in the dormant state, and to control the storage battery power supply unit to supply power to the train permanent load when the working state information is in the awakening state. Therefore, according to the technical scheme, the energy storage device and the storage battery power supply unit are controlled to supply power to the permanent load of the train respectively according to the working state information of the train, and compared with the power supply by using the storage battery completely, the technical scheme provided by the application supplies power when the train is in the dormant state through the energy storage device, so that the capacity requirement of the storage battery is reduced, and the power supply cost is reduced.
The train load power supply circuit and the train load power supply system provided by the utility model are described in detail above. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A train load power supply circuit, comprising:
the device comprises a state detection circuit (1), an energy storage device power supply unit (2) and a storage battery power supply unit (3); the energy storage device power supply unit (2) and the storage battery power supply unit (3) are connected with a train permanent load;
the state detection circuit (1) is connected with the train controller to acquire the working state information of the train;
the state detection circuit (1) is connected with the energy storage device power supply unit (2) and the storage battery power supply unit (3) so as to control the energy storage device power supply unit (2) to supply power to the train permanent load when the working state information is in a dormant state and control the storage battery power supply unit (3) to supply power to the train permanent load when the working state information is in a wake-up state.
2. Train load supply circuit according to claim 1, characterized in that the energy storage device supply unit (2) comprises: the energy storage device (4), the energy storage control unit (5), the voltage conversion unit (6) and the energy storage power supply circuit;
the energy storage control unit (5) is connected with the state detection circuit (1) so as to supply power for the train permanent load when the working state information meets the preset condition;
the input end of the voltage conversion unit (6) is connected with the energy storage device (4), the output end of the voltage conversion unit (6) is connected with the first end of the energy storage power supply circuit, and the second end of the energy storage power supply circuit is connected with the train permanent load so as to output an electric signal under the control of the energy storage control unit (5).
3. Train load supply circuit according to claim 2, characterized in that the battery supply unit (3) comprises: a battery (7), a battery control unit (8) and a battery power supply circuit (9);
the input end of the storage battery power supply circuit (9) is connected with the storage battery (7), the control end of the storage battery power supply circuit (9) is connected with the storage battery control unit (8), and the output end of the storage battery power supply circuit (9) is connected with the train permanent load.
4. A train load supply circuit according to claim 3, characterized in that the energy storage device supply unit (2) further comprises a first supply circuit (13) and a second supply circuit (14);
the input end of the first power supply circuit (13) is connected with the storage battery (7), and the input end of the second power supply circuit (14) is connected with the output end of the voltage conversion unit (6);
the output end of the first power supply circuit (13) and the output end of the second power supply circuit (14) are connected with the energy storage control unit (5).
5. The train load power supply circuit of claim 2, further comprising a high voltage output circuit;
the high-voltage output circuit comprises a high-voltage power supply circuit and a pre-charging circuit; the pre-charging circuit comprises a protection resistor;
the input end of the pre-charging circuit and the input end of the high-voltage power supply circuit are connected with the energy storage device (4), and the output end of the pre-charging circuit and the output end of the high-voltage power supply circuit are used as the output end of the high-voltage output circuit.
6. A train load supply circuit according to claim 3, characterized in that the battery supply circuit (9) comprises: a contactor and a first diode;
the first end of the contactor is connected with the storage battery (7), the first end of the first diode is connected with the second end of the contactor, and the second end of the first diode is connected with the train permanent load.
7. A train load supply circuit according to claim 3, further comprising an auxiliary converter (10);
a first output end of the auxiliary converter (10) is connected with the storage battery (7); the second output end of the auxiliary converter (10) is connected with the energy storage device (4).
8. The train load supply circuit according to claim 2, further comprising a protection circuit (11), a first end of the protection circuit (11) being connected to the output of the energy storage device (4), a second end of the protection circuit (11) being connected to the input of the voltage converting unit (6).
9. The train load supply circuit of claim 3 further comprising: a power supply termination unit (12);
the first end of the power supply termination unit (12) is connected with the state detection circuit (1), and the second end of the power supply termination unit (12) is connected with the storage battery control unit (8) so as to control the storage battery control unit (8) to be closed when the working state information is detected to terminate power supply.
10. A train load power supply system comprising the train load power supply circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321971057.7U CN220535414U (en) | 2023-07-25 | 2023-07-25 | Train load power supply circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321971057.7U CN220535414U (en) | 2023-07-25 | 2023-07-25 | Train load power supply circuit and system |
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| Publication Number | Publication Date |
|---|---|
| CN220535414U true CN220535414U (en) | 2024-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321971057.7U Active CN220535414U (en) | 2023-07-25 | 2023-07-25 | Train load power supply circuit and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220535414U (en) |
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2023
- 2023-07-25 CN CN202321971057.7U patent/CN220535414U/en active Active
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