BEMU rail vehicle low-voltage power supply circuit, control method and device and rail vehicle

Abstract

The present application relates to the field of rail vehicle technology, and particularly relates to a BEMU rail vehicle low-voltage power supply circuit, a control method and device, and a rail vehicle.The circuit comprises a voltage conversion unit and a high-voltage energy storage unit; the voltage conversion unit comprises a DC converter, an auxiliary inverter and a charger; the DC converter is electrically connected with the high-voltage energy storage unit, and the auxiliary inverter and the charger are electrically connected with the DC converter; an input end of the auxiliary inverter is electrically connected with an output end of the high-voltage energy storage unit, and the auxiliary inverter is used for outputting alternating current; an input end of the charger is electrically connected with an output end of the auxiliary inverter, and is used for converting the alternating current into low-voltage direct current to supply power to a low-voltage direct current load.The purpose of the present application is to solve the problem that in the prior art, a BEMU rail vehicle is provided with an auxiliary storage battery, which increases the weight of the vehicle and the crowdedness of installation between various devices, resulting in an increase in energy consumption of the vehicle.

Description

Technical Field

[0001] This invention relates to the field of rail vehicle technology, and in particular to a low-voltage power supply circuit, control method, device, and rail vehicle for a BEMU rail vehicle. Background Technology

[0002] Currently, existing Battery Electric Multiple Unit (BEMU) rail transit vehicles are equipped with high-voltage energy storage units. These units consist of energy storage systems that output 1500V high voltage. Through these energy storage systems, BEMU rail transit vehicles can store electrical energy for extended periods without needing to draw power from the overhead contact line.

[0003] However, existing BEMU rail transit vehicles are still equipped with auxiliary batteries that directly output 110V low-voltage DC power. These auxiliary batteries are used for vehicle starting, emergency power supply, or power supply for dormant loads. The installation of these auxiliary batteries on BEMU rail transit vehicles not only increases the weight of the vehicles and the crowding between various equipment, leading to increased energy consumption, but also, existing auxiliary batteries use nickel-chromium or lead-acid electrolytes, resulting in small battery capacity, short lifespan, and potential environmental pollution. Summary of the Invention

[0004] This invention provides a low-voltage power supply circuit, control method, device, and rail vehicle for BEMU rail transit vehicles, in order to solve the problem that the installation of auxiliary batteries on BEMU rail transit vehicles in the prior art increases the weight of the vehicle and the congestion between various equipment, leading to increased energy consumption of the vehicle.

[0005] This invention provides a low-voltage power supply circuit for BEMU rail vehicles, comprising: a voltage conversion unit and a high-voltage energy storage unit for outputting high-voltage direct current;

[0006] The voltage conversion unit includes: a DC converter, an auxiliary inverter, and a charger;

[0007] The input terminal of the DC-DC converter is electrically connected to the output terminal of the high-voltage energy storage unit, and the input terminals of the control circuit of the auxiliary inverter and the control circuit of the charger are respectively electrically connected to the output terminal of the DC-DC converter.

[0008] When the control circuit of the auxiliary inverter is in operation, the input terminal of the auxiliary inverter is electrically connected to the output terminal of the high-voltage energy storage unit, and the auxiliary inverter is used to output AC power.

[0009] When the control circuit of the charger is in operation, the input terminal of the charger is electrically connected to the output terminal of the auxiliary inverter, which is used to convert the AC power into low-voltage DC power to supply power to the low-voltage DC load.

[0010] A low-voltage power supply circuit for a BEMU rail vehicle according to the present invention further includes a high-voltage disconnect switch;

[0011] The high-voltage disconnect switch is located between the high-voltage energy storage unit and the DC converter.

[0012] According to a low-voltage power supply circuit for a BEMU rail vehicle provided by the present invention, the output terminal of the voltage conversion unit that outputs low-voltage DC power is connected in parallel with at least two power supply wires, wherein one of the power supply wires is used to electrically connect to the low-voltage DC load that needs to be started and the low-voltage DC load that is in a dormant state, and the other power supply wire is only used to electrically connect to the low-voltage DC load that is in a dormant state.

[0013] A diode is installed on the power supply line connecting the low-voltage DC load to be started and the low-voltage DC load to be dormant. The diode is located on the power supply line between the connection point of the low-voltage DC load to be started and the connection point of the low-voltage DC load to be dormant.

[0014] According to the present invention, a low-voltage power supply circuit for a BEMU rail vehicle is provided, wherein a contactor is installed on each of the power supply wires.

[0015] The present invention also provides a control method for the low-voltage power supply circuit of one or more BEMU rail vehicles, comprising:

[0016] Acquire control commands, wherein the control commands include power-on commands, sleep commands, or power-off commands;

[0017] If the control command is a power-on command, the control voltage conversion unit will convert the received high-voltage DC power into low-voltage DC power and connect the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load.

[0018] If the control command is a sleep command, the control voltage conversion unit will convert the high voltage DC power to low voltage DC power, disconnect the power supply line between the voltage conversion unit and the low voltage DC load to be started, and connect the power supply line between the voltage conversion unit and the sleep low voltage DC load.

[0019] If the control command is a power-off command, then the voltage conversion unit is turned off, and the power supply wire between the voltage conversion unit and the low-voltage DC load is disconnected.

[0020] According to the control method of the BEMU rail vehicle low-voltage power supply circuit provided by the present invention, if the control command is a power-on command, the control voltage conversion unit converts the received high-voltage DC power into low-voltage DC power and connects the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load, including:

[0021] If the control command is a power-on command, then after controlling the high-voltage energy storage unit to output high-voltage DC power, it is determined whether the control circuit in the auxiliary inverter in the voltage conversion unit and the control circuit in the charger are working properly.

[0022] If the control circuit in the auxiliary inverter and / or the control circuit in the charger malfunctions, the DC converter in the voltage conversion unit is controlled to supply power to the low-voltage DC load.

[0023] According to the control method for the low-voltage power supply circuit of the BEMU rail vehicle provided by the present invention, after the step of controlling the DC converter in the voltage conversion unit to supply power to the low-voltage DC load if the control circuit in the auxiliary inverter and / or the control circuit in the charger malfunctions, the method further includes:

[0024] The control circuits in the auxiliary inverter and the charger in the voltage conversion unit are checked again to see if they are working properly. If they are working properly, the control circuits in the auxiliary inverter and the charger are controlled to work.

[0025] According to the control method for the low-voltage power supply circuit of the BEMU rail vehicle provided by the present invention, if the control command is a power-off command, after the steps of shutting down the voltage conversion unit and disconnecting the power supply wire between the voltage conversion unit and the low-voltage DC load, the method further includes:

[0026] The high-voltage disconnect switch between the voltage conversion unit and the high-voltage energy storage unit is kept in an isolated state.

[0027] The present invention also provides a control device for one or more low-voltage power supply circuits of BEMU rail vehicles, comprising:

[0028] An acquisition module is used to acquire control commands, wherein the control commands include power-on commands, sleep commands, or power-off commands;

[0029] The power-on module is used to control the voltage conversion unit to convert the received high-voltage DC power into low-voltage DC power if the control command is a power-on command, and to connect the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load.

[0030] A sleep module is used to control the voltage conversion unit to convert the high-voltage DC power to low-voltage DC power if the control command is a sleep command, disconnect the power supply line between the voltage conversion unit and the low-voltage DC load to be started, and connect the power supply line between the voltage conversion unit and the sleep low-voltage DC load.

[0031] The power-off module is used to shut down the voltage conversion unit and disconnect the power supply wire between the voltage conversion unit and the low-voltage DC load if the control command is a power-off command.

[0032] The present invention also provides a rail vehicle, comprising: a BEMU rail vehicle low-voltage power supply circuit as described in any of the preceding claims.

[0033] This invention provides a low-voltage power supply circuit, control method, device, and rail vehicle for BEMU rail vehicles. The BEMU rail vehicle low-voltage power supply circuit utilizes a high-voltage energy storage unit to output high-voltage direct current (DC). A DC-DC converter converts the high-voltage DC to low-voltage DC, which then powers the low-voltage DC load. Simultaneously, the control circuits of the auxiliary inverter and charger are activated by the low-voltage DC power supply. The auxiliary inverter converts the high-voltage DC to AC, and the charger converts the AC to low-voltage DC, also powering the low-voltage DC load. This not only eliminates the need for auxiliary batteries, making the vehicle more environmentally friendly, but also reduces the vehicle's weight and the congestion between various devices. Furthermore, by powering the charger's control circuit through the DC-DC converter, both the DC-DC converter and the charger output low-voltage DC, better ensuring power supply to the low-voltage DC load. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a circuit diagram of the low-voltage power supply circuit for the BEMU rail vehicle provided by the present invention.

[0036] Figure 2 This is a flowchart illustrating the control method for the low-voltage power supply circuit of the BEMU rail vehicle provided by the present invention.

[0037] Figure 3 This is a schematic diagram of the control device for the low-voltage power supply circuit of the BEMU rail vehicle provided by the present invention.

[0038] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0039] Figure label:

[0040] The system includes a high-voltage energy storage unit 100, a DC-DC converter 110, an auxiliary inverter 120, a charger 130, a high-voltage disconnect switch 140, a diode 150, a first contactor 160, a second contactor 170, an acquisition module 310, a power-on module 320, a sleep module 330, and a power-off module 340. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] The following is combined with Figure 1 The present invention describes a low-voltage power supply circuit for a BEMU rail vehicle, comprising a high-voltage energy storage unit 100 and a voltage conversion unit. The voltage conversion unit includes a DC / DC converter 110, an auxiliary inverter (SIV) 120, and a charger (BCG) 130.

[0043] The high-voltage energy storage unit 100 stores high-voltage direct current (HVDC) energy for outputting HVDC power. In this embodiment, the high-voltage energy storage unit 100 is a battery (BAT). The battery is equipped with a vehicle power-off button OFF1 to control the battery's power-off and power-on output to the auxiliary inverter 120. The battery is grounded to GND1 to provide high-voltage leakage protection.

[0044] The input terminal of the DC-DC converter 110 is electrically connected to the output terminal of the high-voltage energy storage unit 100. The DC-DC converter 110 converts high-voltage DC power into low-voltage DC power. The DC-DC converter 110 is equipped with a vehicle power-on button (ON) and a power-off button (OFF2). The power-on button is used for vehicle power-on wake-up control, and the power-off button is used for power-off control of the DC-DC converter 110. The control circuit input terminals of the auxiliary inverter 120 and the charger 130 are electrically connected to the output terminal of the DC-DC converter 110. This allows the low-voltage DC power output from the DC-DC converter 110 to power the control circuits of the auxiliary inverter 120 and the charger 130, thereby enabling the start-up of the auxiliary inverter 120 and the charger 130. Both the DC-DC converter 110 and the charger 130 are grounded to GND2 for low-voltage leakage protection. The auxiliary inverter 120 is equipped with a power-off button (OFF3) for power-off control of the auxiliary inverter 120. The charger 130 is equipped with a power-off button OFF4 for power-off control of the charger 130.

[0045] When the control circuit of the auxiliary inverter 120 is in operation, the input terminal of the auxiliary inverter 120 is electrically connected to the output terminal of the high-voltage energy storage unit 100, and the auxiliary inverter 120 is used to output AC power; in this embodiment, the auxiliary inverter 120 outputs three-phase AC380V AC power.

[0046] When the control circuit of the charger 130 is in operation, the input terminal of the charger 130 is electrically connected to the output terminal of the auxiliary inverter 120, used to convert the AC power into low-voltage DC power to supply power to the low-voltage DC load. In this embodiment, the charger 130 outputs DC 110V DC power to supply power to DC loads DC LOAD1 and DC load LOAD2. DC LOAD1 is a conventional DC load; after the vehicle is powered off, the conventional DC load is de-energized. DC load LOAD1 includes the control circuits for the SIV and BCG. DC LOAD2 contains all the vehicle's dormant DC loads; after the vehicle is powered off, the dormant DC loads remain powered. DC load LOAD2 includes the control circuit for the energy storage battery.

[0047] This invention utilizes a high-voltage energy storage unit 100 to output high-voltage direct current (DC), which is then converted into low-voltage DC by a DC-DC converter 110 to power low-voltage DC loads. Simultaneously, the control circuits of the auxiliary inverter 120 and the charger 130 are both connected to low-voltage DC and then activated. The auxiliary inverter 120 converts the high-voltage DC to AC, and the charger 130 converts the AC to low-voltage DC, also powering low-voltage DC loads. This not only allows BEMU rail transit vehicles to power low-voltage DC loads without the use of auxiliary batteries, making it more environmentally friendly, but also reduces vehicle weight and the crowding of equipment installation after removing the auxiliary batteries. Furthermore, by powering the control circuit of the charger 130 through the DC-DC converter 110, both the DC-DC converter 110 and the charger 130 output low-voltage DC, further ensuring power supply to low-voltage DC loads and preventing power outages.

[0048] Based on this embodiment, the present invention also includes a high-voltage disconnect switch (MS) 140. The high-voltage disconnect switch 140 is disposed between the high-voltage energy storage unit 100 and the DC-DC converter 110. That is, the high-voltage disconnect switch 140 is disposed on the line connecting the output terminal of the high-voltage energy storage unit 100 and the input terminal of the DC-DC converter 110. The high-voltage disconnect switch 140 has two positions: a conducting position and an isolated position. The high-voltage disconnect switch 140 is used to isolate the circuit on the high-voltage side of the DC / DC converter.

[0049] Based on this embodiment, the output terminal of the voltage conversion unit outputting low-voltage DC power is connected in parallel with at least two power supply wires. One power supply wire is used to electrically connect to both the low-voltage DC load to be started (a conventional DC load) and the dormant low-voltage DC load, while the other power supply wire is used only to electrically connect to the dormant low-voltage DC load. Furthermore, a contactor is installed on each power supply wire. Specifically, the output terminal of the voltage conversion unit outputting low-voltage DC power is connected in parallel with two power supply wires. A first contactor (Q1) 160 is installed on the power supply wire used to electrically connect to both the low-voltage DC load to be started and the dormant low-voltage DC load. The first contactor 160 is used for energizing the conventional DC load. A second contactor (Q2) 170 is installed on the power supply wire used only to electrically connect to the dormant low-voltage DC load. The second contactor 170 is used for energizing the dormant DC load.

[0050] A diode (D1) 150 is mounted on the power supply line connecting the low-voltage DC load to be started and the low-voltage DC load to be in a dormant state. The diode 150 is located on the power supply line between the connection point of the low-voltage DC load to be started and the connection point of the low-voltage DC load to be in a dormant state. The diode 150 prevents the low-voltage power output from the normally open contact of the second contactor 170 from returning to DC LOAD1.

[0051] After the high-voltage disconnect switch 140 of this invention is closed, the energy storage battery continuously provides high-voltage DC power to the DC-DC converter 110. The DC-DC converter 110 starts outputting low-voltage DC power of 110V. After the DC-DC converter 110 provides low-voltage DC power, the normally open contact of the first contactor 160 closes, and the low-voltage DC power of 110V is output to the DC loads DC LOAD1 and DC LOAD2. After the low-voltage DC power of 110V is supplied to the control circuit of the energy storage battery, the energy storage battery outputs high-voltage DC power to the auxiliary inverter 120. The auxiliary inverter 120 starts working and outputs three-phase AC 380V AC power, which is supplied to the charger 130. The charger 130 outputs DC 110V DC power to the DC loads DC LOAD1 and DC LOAD2. When the auxiliary inverter 120 and the charger 130 fail, the DC-DC converter 110 can provide DC 110V DC power independently.

[0052] The control method for the low-voltage power supply circuit of the BEMU rail vehicle provided by the present invention is described below. The control method for the low-voltage power supply circuit of the BEMU rail vehicle described below can control the low-voltage power supply circuit of the BEMU rail vehicle described above.

[0053] Please refer to the following: Figure 2 A control method for the low-voltage power supply circuit of a BEMU rail vehicle, comprising:

[0054] S10. Obtain control commands, wherein the control commands include power-on commands, hibernation commands, or power-off commands. Specifically, the high-voltage energy storage unit in the low-voltage power supply circuit of the BEMU rail vehicle is an energy storage battery BAT, and the voltage conversion unit includes a DC / DC converter, an auxiliary inverter SIV, and a charger BCG.

[0055] S21. If the control command is a power-on command, the control voltage conversion unit converts the received high-voltage DC power into low-voltage DC power and connects the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load. In this embodiment, the high-voltage isolating switch MS is controlled to the ON position and the vehicle power-on button is closed. After the DC converter starts, it outputs DC110V low-voltage DC power. At the same time, the normally open contact of the first contactor Q1 is controlled to close, and DC110V low-voltage DC power is output to DC LOAD1 and DC LOAD2 DC loads. The vehicle power-off buttons OFF1, OFF2, and OFF3 are controlled to close. After the DC110V low-voltage DC power is supplied to the control circuit of the energy storage battery, the energy storage battery outputs high-voltage DC power to the auxiliary inverter. The auxiliary inverter outputs three-phase AC380V AC power, which is supplied to the charger. The charger outputs DC110V DC power, which is output to DC LOAD1 and DC LOAD2 DC loads.

[0056] S22. If the control command is a sleep command, the control voltage conversion unit converts the high-voltage DC power to low-voltage DC power, disconnects the power supply line between the voltage conversion unit and the low-voltage DC load to be started, and connects the power supply line between the voltage conversion unit and the sleep low-voltage DC load. Specifically, the control high-voltage isolating switch MS is in the ON position, so that after the DC converter starts, it converts the high-voltage DC power to DC110V low-voltage DC power; at the same time, the control power-off buttons OFF1, OFF2, and OFF3 are opened. At this time, the energy storage battery disconnects the high-voltage output to the auxiliary inverter, the auxiliary inverter and charger stop working, the control first contactor Q1 contacts open after a 10-second delay, and after the charger stops working, the control second contactor Q2 normally open contacts close immediately. The DC converter supplies power only to the sleep DC load DC LOAD2 through the second contactor Q2, and the reverse protection diode D1 prevents the power supply from supplying power to the normal DC load DC LOAD1.

[0057] S23. If the control command is a power-off command, then the voltage conversion unit is shut down, and the power supply wire between the voltage conversion unit and the low-voltage DC load is disconnected. Specifically, the power-off buttons OFF1, OFF2, OFF3, and OFF4 are opened, causing the DC converter, auxiliary inverter, and charger to stop working. At the same time, the normally open contact of the second contactor Q2 can be opened to disconnect the DC 110V low-voltage power supply output.

[0058] Furthermore, if off-vehicle operations are required, the high-voltage disconnect switch can be switched to the disconnect position to disconnect the high-voltage power supply from the energy storage battery to the DC-DC converter.

[0059] This invention acquires control commands and then controls the low-voltage power supply circuit of the rail transit vehicle to supply or cut off power according to the control commands, enabling the vehicle to start normally without a battery, and simultaneously ensuring continuous power supply to the vehicle's dormant loads. Eliminating the auxiliary battery reduces the overall weight of the vehicle, lowers energy consumption, saves space for under-vehicle equipment installation, and reduces overall vehicle design costs, thus achieving energy conservation and emission reduction.

[0060] Based on this embodiment, if the control command is a power-on command, the control voltage conversion unit converts the received high-voltage DC power into low-voltage DC power and connects the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load, including:

[0061] If the control command is a power-on command, then after controlling the high-voltage energy storage unit to output high-voltage DC power, it is determined whether the control circuit in the auxiliary inverter of the voltage conversion unit and the control circuit in the charger are working properly.

[0062] If the control circuit in the auxiliary inverter and / or the control circuit in the charger malfunctions, the DC converter in the voltage conversion unit is controlled to supply power to the low-voltage DC load.

[0063] By determining whether the control circuits in the auxiliary inverter and the charger in the voltage conversion unit are working properly, the DC converter in the voltage conversion unit is controlled to supply power to the low-voltage DC load, thereby enabling continuous power supply to the dormant load after the vehicle is powered off and continuous power supply to the emergency low-voltage DC load in the event of a failure of the auxiliary inverter and the charger.

[0064] Based on this embodiment, if the control circuit in the auxiliary inverter and / or the control circuit in the charger malfunctions, after the step of controlling the DC converter in the voltage conversion unit to supply power to the low-voltage DC load, the method further includes:

[0065] The system then re-evaluates whether the control circuits in the auxiliary inverter and charger within the voltage conversion unit are functioning correctly. If they are, the system controls them to operate. This ensures that the auxiliary inverter converts the received high-voltage DC power into AC power, and the charger then converts the AC power into low-voltage DC power to supply power to the low-voltage DC load.

[0066] Based on this embodiment, if the control command is a power-off command, then after the steps of shutting down the voltage conversion unit and disconnecting the power supply wire between the voltage conversion unit and the low-voltage DC load, the method further includes:

[0067] The high-voltage disconnect switch between the voltage conversion unit and the high-voltage energy storage unit is kept in an isolated state. This isolates the circuitry on the high-voltage energy storage unit side.

[0068] The control device for the low-voltage power supply circuit of the BEMU rail vehicle provided by the present invention is described below. The control device for the low-voltage power supply circuit of the BEMU rail vehicle described below can be referred to in correspondence with the control method for the low-voltage power supply circuit of the BEMU rail vehicle described above.

[0069] Please refer to the following: Figure 3 A control device utilizing the low-voltage power supply circuit of a BEMU rail vehicle includes an acquisition module 310, a power-on module 320, a sleep module 330, and a power-off module 340.

[0070] The acquisition module 310 acquires control commands, wherein the control commands include power-on commands, sleep commands, or power-off commands.

[0071] If the control command of the power-on module 320 is a power-on command, then the control voltage conversion unit will convert the received high-voltage DC power into low-voltage DC power and connect the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load.

[0072] If the control command of the hibernation module 330 is a hibernation command, then the control voltage conversion unit will convert the high-voltage DC power to low-voltage DC power, disconnect the power supply line between the voltage conversion unit and the low-voltage DC load to be started, and connect the power supply line between the voltage conversion unit and the hibernating low-voltage DC load.

[0073] If the control command of the power-off module 340 is a power-off command, then the voltage conversion unit is shut down and the power supply wire between the voltage conversion unit and the low-voltage DC load is disconnected.

[0074] After the acquisition module 310 receives the control command, if the control command is a power-on command, it operates through the power-on module 320; if the control command is a hibernation command, it operates through the hibernation module 330; and if the control command is a power-off command, it operates through the power-off module 340. This allows the BEMU rail transit vehicle to start normally without a battery, while also enabling continuous power supply to hibernation loads and power outages. Eliminating the auxiliary battery configuration reduces the overall weight of the BEMU rail transit vehicle, lowers energy consumption, saves space for undercarriage equipment installation, and reduces overall vehicle design costs, achieving energy conservation and emission reduction.

[0075] Specifically, the power-on module 320 is used to control the voltage conversion unit to convert the received high-voltage DC power into low-voltage DC power if the control command is a power-on command, and to connect the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load, including:

[0076] If the control command is a power-on command, then after controlling the high-voltage energy storage unit to output high-voltage DC power, it is determined whether the control circuit in the auxiliary inverter in the voltage conversion unit and the control circuit in the charger are working properly.

[0077] If the control circuit in the auxiliary inverter and / or the control circuit in the charger malfunctions, the DC converter in the voltage conversion unit is controlled to supply power to the low-voltage DC load.

[0078] If the control circuit in the auxiliary inverter and / or the control circuit in the charger malfunctions, after the step of controlling the DC converter in the voltage conversion unit to supply power to the low-voltage DC load, the method further includes:

[0079] The control circuits in the auxiliary inverter and the charger in the voltage conversion unit are checked again to see if they are working properly. If they are working properly, the control circuits in the auxiliary inverter and the charger are controlled to work.

[0080] Simultaneously, after the steps of shutting down the voltage conversion unit and disconnecting the power supply wire between the voltage conversion unit and the low-voltage DC load if the control command is a power-off command, the power-off module 340 further includes:

[0081] The high-voltage disconnect switch between the voltage conversion unit and the high-voltage energy storage unit is kept in an isolated state.

[0082] The present invention also provides a rail vehicle, comprising: a BEMU rail vehicle low-voltage power supply circuit as described in any of the preceding claims.

[0083] Figure 4An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430, and a communication bus 440, wherein the processor 410, the communication interface 420, and the memory 430 communicate with each other through the communication bus 440. The processor 410 can call logic instructions in the memory 430 to execute a control method for the low-voltage power supply circuit of the BEMU rail vehicle, the method including:

[0084] S10. Obtain control commands, wherein the control commands include power-on commands, sleep commands, or power-off commands;

[0085] S21. If the control command is a power-on command, the control voltage conversion unit will convert the received high-voltage DC power into low-voltage DC power and connect the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load.

[0086] S22. If the control command is a sleep command, the control voltage conversion unit converts the high voltage DC power to low voltage DC power, disconnects the power supply line between the voltage conversion unit and the low voltage DC load to be started, and connects the power supply line between the voltage conversion unit and the sleep low voltage DC load.

[0087] S23. If the control command is a power-off command, then shut down the voltage conversion unit and disconnect the power supply wire between the voltage conversion unit and the low-voltage DC load.

[0088] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0089] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program that can be stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, the computer is able to execute the control method for the low-voltage power supply circuit of the BEMU rail vehicle provided by the above methods, the method comprising:

[0090] S10. Obtain control commands, wherein the control commands include power-on commands, sleep commands, or power-off commands;

[0091] S21. If the control command is a power-on command, the control voltage conversion unit will convert the received high-voltage DC power into low-voltage DC power and connect the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load.

[0092] S22. If the control command is a sleep command, the control voltage conversion unit converts the high voltage DC power to low voltage DC power, disconnects the power supply line between the voltage conversion unit and the low voltage DC load to be started, and connects the power supply line between the voltage conversion unit and the sleep low voltage DC load.

[0093] S23. If the control command is a power-off command, then shut down the voltage conversion unit and disconnect the power supply wire between the voltage conversion unit and the low-voltage DC load.

[0094] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a control method for the low-voltage power supply circuit of the BEMU rail vehicle provided by the methods described above, the method comprising:

[0095] S10. Obtain control commands, wherein the control commands include power-on commands, sleep commands, or power-off commands;

[0096] S21. If the control command is a power-on command, the control voltage conversion unit will convert the received high-voltage DC power into low-voltage DC power and connect the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load.

[0097] S22. If the control command is a sleep command, the control voltage conversion unit converts the high voltage DC power to low voltage DC power, disconnects the power supply line between the voltage conversion unit and the low voltage DC load to be started, and connects the power supply line between the voltage conversion unit and the sleep low voltage DC load.

[0098] S23. If the control command is a power-off command, then shut down the voltage conversion unit and disconnect the power supply wire between the voltage conversion unit and the low-voltage DC load.

[0099] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0100] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-voltage power supply circuit for BEMU rail vehicles, characterized in that, include: The circuit includes a voltage conversion unit and a high-voltage energy storage unit for outputting high-voltage direct current; however, no low-voltage auxiliary battery is provided in the circuit for supplying power to a low-voltage direct current load. The voltage conversion unit includes: a DC converter, an auxiliary inverter, and a charger; The input terminal of the DC-DC converter is electrically connected to the output terminal of the high-voltage energy storage unit, and is used to convert the high-voltage DC power into low-voltage DC power to enable vehicle power-on wake-up; the control circuit input terminal of the auxiliary inverter and the control circuit input terminal of the charger are respectively electrically connected to the output terminal of the DC-DC converter. When the control circuit of the auxiliary inverter is in operation, the input terminal of the auxiliary inverter is electrically connected to the output terminal of the high-voltage energy storage unit, and the auxiliary inverter is used to output AC power. When the control circuit of the charger is in operation, the input terminal of the charger is electrically connected to the output terminal of the auxiliary inverter, which is used to convert the AC power into low-voltage DC power to supply power to the low-voltage DC load. The output terminal of the voltage conversion unit that outputs low-voltage DC power is connected in parallel with at least two power supply wires. One of the power supply wires is equipped with a first contactor for electrical connection with the low-voltage DC load that needs to be started and the low-voltage DC load that is in a dormant state. The other power supply wire is equipped with a second contactor for electrical connection only with the low-voltage DC load that is in a dormant state. A diode is installed on the power supply wire connecting the low-voltage DC load to be started and the low-voltage DC load to be dormant. The diode is located on the power supply wire between the connection point of the low-voltage DC load to be started and the connection point of the low-voltage DC load to be dormant. The low-voltage DC load that needs to be started includes the control circuit of the auxiliary inverter and the control circuit of the charger; the low-voltage DC load that is in a dormant state includes the control circuit of the high-voltage energy storage unit.

2. The BEMU rail vehicle low-voltage power supply circuit according to claim 1, characterized in that, It also includes high-voltage disconnect switches; The high-voltage disconnect switch is located between the high-voltage energy storage unit and the DC converter.

3. A control method based on the low-voltage power supply circuit of the BEMU rail vehicle as described in claim 1 or 2, characterized in that, include: Acquire control commands, wherein the control commands include power-on commands, sleep commands, or power-off commands; If the control command is a power-on command, the control voltage conversion unit will convert the received high-voltage DC power into low-voltage DC power and connect the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load. If the control command is a sleep command, the control voltage conversion unit will convert the high voltage DC power to low voltage DC power, disconnect the power supply line between the voltage conversion unit and the low voltage DC load to be started, and connect the power supply line between the voltage conversion unit and the sleep low voltage DC load. If the control command is a power-off command, then the voltage conversion unit is turned off, and the power supply wire between the voltage conversion unit and the low-voltage DC load is disconnected.

4. The control method according to claim 3, characterized in that, If the control command is a power-on command, the control voltage conversion unit converts the received high-voltage DC power into low-voltage DC power and connects the power supply wire between the low-voltage DC output terminal of the voltage conversion unit and the low-voltage DC load, including: If the control command is a power-on command, then after controlling the high-voltage energy storage unit to output high-voltage DC power, it is determined whether the control circuit in the auxiliary inverter in the voltage conversion unit and the control circuit in the charger are working properly. If the control circuit in the auxiliary inverter and / or the control circuit in the charger malfunctions, the DC converter in the voltage conversion unit is controlled to supply power to the low-voltage DC load.

5. The control method according to claim 3, characterized in that, If the control circuit in the auxiliary inverter and / or the control circuit in the charger malfunctions, after the step of controlling the DC converter in the voltage conversion unit to supply power to the low-voltage DC load, the method further includes: The control circuits in the auxiliary inverter and the charger in the voltage conversion unit are checked again to see if they are working properly. If they are working properly, the control circuits in the auxiliary inverter and the charger are controlled to work.

6. The control method according to claim 3, characterized in that, If the control command is a power-off command, then after the steps of shutting down the voltage conversion unit and disconnecting the power supply wire between the voltage conversion unit and the low-voltage DC load, the method further includes: The high-voltage disconnect switch between the voltage conversion unit and the high-voltage energy storage unit is kept in an isolated state.

7. A control device utilizing the low-voltage power supply circuit of a BEMU rail vehicle, characterized in that, Based on the BEMU rail vehicle low-voltage power supply circuit according to claim 1 or 2, the control device includes: An acquisition module is used to acquire control commands, wherein the control commands include power-on commands, sleep commands, or power-off commands; The power-on module is used to control the voltage conversion unit to convert the received high-voltage DC power into low-voltage DC power if the control command is a power-on command, and to connect the power supply wire between the low-voltage DC power output terminal of the voltage conversion unit and the low-voltage DC load. A sleep module is used to control the voltage conversion unit to convert the high-voltage DC power to low-voltage DC power if the control command is a sleep command, disconnect the power supply line between the voltage conversion unit and the low-voltage DC load to be started, and connect the power supply line between the voltage conversion unit and the sleep low-voltage DC load. The power-off module is used to shut down the voltage conversion unit and disconnect the power supply wire between the voltage conversion unit and the low-voltage DC load if the control command is a power-off command.

8. A rail vehicle, characterized in that, include: The BEMU low-voltage power supply circuit as described in claim 1 or 2.

Images