Power supply control circuit and distribution box

Abstract

The invention provides a power supply control circuit and a distribution box, and the power supply control circuit comprises a plurality of power input ends which are used for providing a first AC voltage; the safety protection module is used for realizing leakage protection of the power supply control circuit; the transformer is used for carrying out voltage transformation processing on the first alternating-current voltage to generate second alternating-current voltage; the alternating current distribution module is used for realizing voltage protection and current protection of the power supply control circuit; the display control module is used for providing input display of a plurality of power input ends and output display of a plurality of output branches, and is also used for generating a device control instruction according to a received upper computer control instruction; the alternating current contactor is used for controlling power-on or power-off of the main loop; the plurality of output branches are used for supplying power to a load; and the circuit breaker is used for realizing over-current protection, overload protection and short-circuit protection of the plurality of output branches. According to the technical scheme provided by the embodiment of the invention, redundant power supply of the vehicle-mounted equipment is realized, and the performance of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply and distribution, and in particular to a power supply control circuit and a distribution box. Background Art

[0002] In the related art, the power source of the upper-mounted electrical equipment in mobile vehicles is mostly a single power source, that is, the AC 380V power source provided by the chassis power generator, which is distributed to the electrical equipment through the distribution box after voltage stabilization to drive the electrical equipment to work. However, with the large-scale and complex mobile vehicles, the demand for uninterrupted power supply is also increasing, and the single power supply distribution box design can no longer meet the increasingly complex power distribution needs. Summary of the invention

[0003] In view of the above problems, an embodiment of the present invention provides a power supply control circuit and a distribution box to solve the problem that the single power supply distribution box design in the prior art can no longer meet the increasingly complex power distribution needs.

[0004] In a first aspect, an embodiment of the present invention provides a power supply control circuit, the power supply control circuit comprising:

[0005] A plurality of power input terminals, used for providing a first AC voltage;

[0006] A safety protection module, used for monitoring leakage current of the plurality of power input terminals to implement leakage protection of the power supply control circuit;

[0007] A transformer, used for transforming the first AC voltage to generate a second AC voltage;

[0008] An AC power distribution module, used for monitoring voltage parameters and current parameters, so as to realize voltage protection and current protection of the power supply control circuit;

[0009] A display control module, used for providing input display of the plurality of power input terminals and output display of the plurality of output branches, and for generating device control instructions according to received host computer control instructions;

[0010] An AC contactor, used to control the coil to be energized or de-energized according to the control instructions of the device, so as to control the main circuit to be energized or de-energized;

[0011] Multiple output branches for powering loads;

[0012] The circuit breaker is used to implement overcurrent protection, overload protection and short circuit protection for the multiple output branches.

[0013] In a possible implementation, the multiple power input terminals are electrically connected to the safety protection module;

[0014] The safety protection module is electrically connected to the transformer and the AC power distribution module respectively;

[0015] The transformer is electrically connected to the AC power distribution module;

[0016] The AC power distribution module is electrically connected to the display control module and the AC contactor respectively;

[0017] The display control module is electrically connected to the AC contactor;

[0018] The circuit breaker is electrically connected to the AC contactor and the load respectively.

[0019] In a possible implementation manner, the power supply control circuit further includes:

[0020] The auxiliary power supply module is electrically connected to the transformer and the display control module respectively, and is used to convert the second AC voltage into a first DC voltage, and after combining and stabilizing the first DC voltage and the second DC voltage input from the chassis battery, provide a DC control voltage for the display control module and the control components in the power supply control circuit; or, after stabilizing the second DC voltage input from the chassis battery, provide a DC control voltage for the display control module and the control components in the power supply control circuit.

[0021] In a possible implementation manner, the power supply control circuit further includes:

[0022] An Ethernet communication module, the Ethernet communication module is electrically connected to the display control module, and the Ethernet communication module is used to convert received Ethernet data into controller area network (CAN) bus data recognizable by the display control module.

[0023] In a possible implementation, the power supply control circuit further includes a lightning protection module, which is electrically connected to the safety protection module and the transformer, respectively, and is used to protect the power supply control circuit from high transient overvoltage hazards during lightning strikes.

[0024] In one possible implementation, the safety protection module is specifically used to control the main circuit to cut off power when the instantaneous leakage current is greater than or equal to a first protection threshold, or when the cumulative leakage current is greater than or equal to a second protection threshold, and the first protection threshold is less than the second protection threshold.

[0025] In a possible implementation, the device control instruction includes an opening instruction and a closing instruction; the AC contactor includes a coil;

[0026] The AC contactor is specifically used to control the coil to lose power in response to the opening instruction so as to cut off power to the main circuit; or, in response to the closing instruction, control the coil to be energized so as to energize the main circuit.

[0027] In a possible implementation, the multiple power input terminals include an external AC power input terminal, a chassis power generation power input terminal, and a high-energy battery inverter power input terminal;

[0028] The power supply priorities of the multiple power input terminals are, from high to low, external AC power supply input terminal, chassis power generation power supply input terminal, and high-energy battery inverter power supply input terminal.

[0029] In a possible implementation, the safety protection module, the AC power distribution module and the display control module communicate and transmit via a CAN bus.

[0030] In a second aspect, an embodiment of the present invention provides a distribution box, the distribution box comprising:

[0031] A plurality of status indicator lights, used to indicate different states of the distribution box;

[0032] A plurality of lighted buttons, used to indicate different states of the distribution box by light colors when the lighted buttons are pressed;

[0033] A circuit breaker operation panel is provided with a plurality of circuit breaker switches, and the circuit breaker switches are used to control the state of the circuit breaker to connect or disconnect the power supply of the output branch where the circuit breaker is located.

[0034] In the technical solution provided by the embodiment of the present invention, the AC voltage provided by multiple power input terminals can be effectively distributed and then output, thereby realizing redundant power supply for vehicle-mounted equipment, improving the reliability of the vehicle-mounted equipment, and improving the performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A connection diagram of a power supply control circuit provided by an embodiment of the present invention.

[0036] Figure 2 A connection diagram of another power supply control circuit provided by an embodiment of the present invention.

[0037] Figure 3 A schematic diagram of a distribution box provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer and more understandable, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. 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 creative work are within the scope of protection of the present invention.

[0039] Figure 1 A connection diagram of a power supply control circuit provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the power supply control circuit includes multiple power input terminals 11, a safety protection module 12, a transformer 13, an AC power distribution module 14, a display control module 15, an AC contactor 16, a circuit breaker 17 and a load 18. The multiple power input terminals 11 are electrically connected to the safety protection module 12; the safety protection module 12 is electrically connected to the transformer 13 and the AC power distribution module 14 respectively; the transformer 13 is electrically connected to the AC power distribution module 14; the AC power distribution module 14 is electrically connected to the display control module 15 and the AC contactor 16 respectively; the display control module 15 is electrically connected to the AC contactor 16; the circuit breaker 17 is electrically connected to the AC contactor 16 and the load 18 respectively.

[0040] In an embodiment of the present invention, multiple power input terminals 11 are used to provide a first AC voltage; a safety protection module 12 is used to monitor the leakage current of multiple power input terminals to achieve leakage protection of the power supply control circuit; a transformer 13 is used to transform the first AC voltage to generate a second AC voltage; an AC power distribution module 14 is used to monitor voltage parameters and current parameters to achieve voltage protection and current protection of the power supply control circuit; a display control module 15 is used to provide input display of the multiple power input terminals and output display of the multiple output branches, and is also used to generate device control instructions according to the received host computer control instructions; an AC contactor 16 is used to control the coil to be energized or de-energized according to the device control instruction to control the main circuit to be energized or de-energized; multiple output branches are used to supply power to a load 18; a circuit breaker 17 is used to achieve overcurrent protection, overload protection and short circuit protection of multiple output branches.

[0041] In the embodiment of the present invention, the safety protection module 12, the AC power distribution module 14 and the display control module 15 realize communication transmission through the CAN bus. The main circuit is a circuit formed by multiple power input terminals 11, the safety protection module 12, the transformer 13, the AC power distribution module 14, the AC contactor 16 and the circuit breaker 17.

[0042] In the embodiment of the present invention, the voltage parameters monitored by the AC power distribution module 14 include input voltage and output voltage, and the current parameters include input current and output current. Voltage protection includes overvoltage protection, undervoltage protection and phase loss protection, and current protection includes overcurrent protection.

[0043] In the embodiment of the present invention, the power supply control circuit further includes an auxiliary power supply module 19, which is electrically connected to the transformer 13 and the display control module 15 respectively, and is used to convert the second AC voltage into a first DC voltage, and after merging and stabilizing the first DC voltage and the second DC voltage input from the chassis battery, provide a DC control voltage for the display control module and the control components in the power supply control circuit; or, after stabilizing the second DC voltage input from the chassis battery, provide a DC control voltage for the display control module and the control components in the power supply control circuit. The control components include a safety protection module 12, an AC power distribution module 14, and an AC contactor 16. For example, the second AC voltage is 38V AC voltage, the first DC voltage is 24V DC voltage, and the DC control voltage is 24V DC voltage.

[0044] Specifically, when any one of the multiple power input terminals supplies power, the auxiliary power module 19 can obtain the first DC voltage, thereby combining with the second DC voltage to provide a DC control voltage for the display control module 15 and the control device. When none of the multiple power input terminals supplies power and the chassis battery supplies power, the auxiliary power module provides a DC control voltage for the display control module 15 and the control device through the second DC voltage.

[0045] In the embodiment of the present invention, the power supply control circuit also includes an Ethernet communication module 20, which is electrically connected to the display control module 15, and the Ethernet communication module is used to convert the received Ethernet data into controller area network bus (Controller Area Network, CAN) bus data recognizable by the display control module. The Ethernet communication module 22 has two independent Ethernet channels, one of which is used as a main channel and the other is used as a redundant channel. When the main channel fails and cannot be used, the redundant channel intervenes and takes over the work of the main channel to reduce the failure time.

[0046] In the embodiment of the present invention, the power supply control circuit further includes a lightning protection module 21, which is electrically connected to the safety protection module 12 and the transformer 13 respectively, and is used to protect the power supply control circuit from high transient overvoltage hazards during lightning strikes.

[0047] In the embodiment of the present invention, the safety protection module 12 is specifically used to control the main circuit to be powered off when the instantaneous leakage current is greater than or equal to the first protection threshold, or when the cumulative leakage current is greater than or equal to the second protection threshold, and the first protection threshold is less than the second protection threshold. For example, the first protection threshold is 50mA and the second protection threshold is 100mA.

[0048] Specifically, a zero-sequence current transformer is provided in the safety protection module 12. When a leakage fault or three-phase imbalance occurs in the power supply control circuit, the zero-sequence current transformer outputs a zero-sequence current, which generates a magnetic flux in the secondary winding core of the zero-sequence current transformer, thereby generating an induced voltage. When the induced voltage reaches a preset threshold, the power supply circuit is cut off.

[0049] Specifically, the host computer control instruction includes an opening instruction and a closing instruction, and correspondingly, the device control instruction includes an opening instruction and a closing instruction. The AC contactor 16 is specifically used to control the coil to lose power in response to the opening instruction so as to cut off the power of the main circuit; or, in response to the closing instruction, control the coil to energize so as to energize the main circuit.

[0050] In the technical solution provided by the embodiment of the present invention, the AC voltage provided by multiple power input terminals can be effectively distributed and then output, thereby realizing redundant power supply for vehicle-mounted equipment, improving the reliability of the vehicle-mounted equipment, and improving the performance of the vehicle.

[0051] Figure 2 A connection diagram of another power supply control circuit provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the multiple power input terminals 11 include three power input terminals, namely, an external AC power input terminal 111, a chassis power generation power input terminal 112, and a high-energy battery inverter power input terminal 113. The power supply priorities of the multiple power input terminals are, from high to low, the external AC power input terminal 111, the chassis power generation power input terminal 112, and the high-energy battery inverter power input terminal 113.

[0052] In an embodiment of the present invention, three power input terminals are set to two types of redundant control for power distribution output, and the first type of power input terminals are the external AC power supply input terminal 111 and the chassis power take-off power supply input terminal 112. At the same time, only one of the first type of power input terminals can be powered. External AC power supply and chassis power take-off power supply are respectively applied to different working conditions of the vehicle. Among them, external AC power supply is suitable for the case where there is a 380V AC voltage power supply, and is mainly used in the vehicle commissioning stage and the vehicle maintenance stage. The external AC power supply is connected to the vehicle through the prefabricated cables equipped with the vehicle to provide a 380V AC voltage for the distribution box. Chassis power take-off power supply is a traditional power supply method for vehicles. A power take-off is installed on the chassis of the vehicle. When the vehicle is driving, the power take-off transmits the power of the vehicle to the generator through the drive shaft, thereby converting mechanical energy into electrical energy and providing a 380V AC voltage for the distribution box.

[0053] In an embodiment of the present invention, the second type of power input terminal is a high-energy battery inverter power supply input terminal 113. The high-energy battery inverter power supply is used as a backup power supply mode (that is, a redundant power supply mode). The DC high voltage inverter output by the high-energy battery is converted into a 380V AC voltage and then connected to the distribution box to provide a 380V AC voltage for the distribution box.

[0054] The power supply control circuit has two power supply modes. The first power supply mode is a single power supply mode. In the single power supply mode, any one of the first power input terminals is powered, and the second power input terminal is not powered. The second power supply mode is a redundant power supply mode. In the redundant power supply mode, any one of the first power input terminals is powered, and the second power input terminal is powered as a redundant power input terminal.

[0055] In the embodiment of the present invention, the safety protection module 12 includes a first safety protection module 121 and a second safety protection module 122, and the transformer 13 includes a first transformer 131, a second transformer 132 and a third transformer 133. The first safety protection module 121 is electrically connected to the high-energy battery inverter power supply input terminal 113 and the first transformer 131, respectively, and the second safety protection module 122 is electrically connected to the external AC power supply input terminal 111, the chassis power generation power supply input terminal 112 and the second transformer 133, respectively.

[0056] In the embodiment of the present invention, the AC power distribution module includes a first AC power distribution module 141, a second AC power distribution module 142 and a third AC power distribution module 143, and the AC contactor 16 includes a first AC contactor 161, a second AC contactor 162 and a third AC contactor 163. The first AC power distribution module 141 is electrically connected to the first safety protection module 121, the first transformer 131, the second AC power distribution module 142 and the first AC contactor 161 respectively, the second AC power distribution module 142 is electrically connected to the second transformer 132, the third AC power distribution module 143 and the second AC contactor 162 respectively, and the third AC power distribution module 143 is electrically connected to the third transformer 133, the display control module 15 and the third AC contactor 163 respectively.

[0057] In the embodiment of the present invention, a description is given by taking the case where the plurality of output branches include six output branches as an example. The circuit breaker 17 includes a first circuit breaker 171, a second circuit breaker 172, a third circuit breaker 173, a fourth circuit breaker 174, a fifth circuit breaker 175, and a sixth circuit breaker 176. The first AC contactor 161 is electrically connected to the first circuit breaker 171, the third circuit breaker 173, and the fifth circuit breaker 175, respectively, the second AC contactor 162 is electrically connected to the second circuit breaker 172, the fourth circuit breaker 174, and the sixth circuit breaker 176, respectively, and the third AC contactor 163 is electrically connected to the second circuit breaker 172, the fourth circuit breaker 174, and the sixth circuit breaker 176, respectively.

[0058] In the embodiment of the present invention, the load 18 includes a first load 181, a second load 182, a third load 183, a fourth load 184, a fifth load 185, a sixth load 186 and a seventh load 187, each of which is controlled by two circuit breakers. The first load 181 is electrically connected to the first circuit breaker 171 and the second circuit breaker 172, respectively, the second load 182 is electrically connected to the third circuit breaker 173 and the fourth circuit breaker 174, respectively, the third load 183 is electrically connected to the third circuit breaker 173 and the fourth circuit breaker 174, respectively, the fourth load 184 is electrically connected to the third circuit breaker 173 and the fourth circuit breaker 174, respectively, the fifth load 185 is electrically connected to the fifth circuit breaker 175 and the sixth circuit breaker 176, respectively, and the sixth load 186 is electrically connected to the fifth circuit breaker 175 and the sixth circuit breaker 176, respectively.

[0059] In an embodiment of the present invention, each output branch is controlled by two circuit breakers. In practical applications, the on / off state of the circuit breaker can be controlled according to usage requirements to adjust the number of output branches for external power distribution. For example, the output branch where the first load 181 is located is controlled by the first circuit breaker 171 and the second circuit breaker 172. When the first circuit breaker 171 and the second circuit breaker 172 are both closed, both output branches can supply power to the first load 181, thereby achieving redundant power supply. For another example, when either the first circuit breaker 171 or the second circuit breaker 172 is closed, the output branch corresponding to the closed circuit breaker supplies power to the first load 181.

[0060] In the embodiment of the present invention, the power supply control circuit further includes an auxiliary power supply module 19 , and the auxiliary power supply module 19 is electrically connected to the first transformer 131 , the second transformer 132 , and the third transformer 133 , respectively.

[0061] In the embodiment of the present invention, the power supply control circuit further includes an Ethernet communication module 20 , and the Ethernet communication module 20 is electrically connected to the display control module 15 .

[0062] In the embodiment of the present invention, the power supply control circuit further includes a lightning protection module 21 , and the lightning protection module 21 is electrically connected to the second safety protection module 122 and the third transformer 133 , respectively.

[0063] In the embodiment of the present invention, the power supply control circuit also includes a CAN communication input and output interface 22, which is connected to the display control module 15 and is used for communication and transmission with external devices. The display control module 15 has four independent CAN channels, and the four CAN channels are divided into two groups, one group is used for communication and transmission with the AC power distribution module 14, and the other group is used for communication and transmission with external devices through the CAN communication input and output interface 22. Each group has two CAN channels, one of which is used as the main channel and the other is used as a redundant channel. When the main channel fails and cannot be used, the redundant channel intervenes and takes over the work of the main channel to reduce the failure time.

[0064] In the embodiment of the present invention, the power supply control circuit further includes a redundant emergency stop input interface 23 , and the redundant emergency stop input interface 23 is electrically connected to the display control module 15 .

[0065] like Figure 2As shown, the various components in the power supply control circuit are electrically connected through a variety of different cables. In the embodiment of the present invention, different line colors are used to represent different cables. Among them, the red line represents the cable that provides 380V AC voltage from the first type of power input terminal (i.e., the external AC power input terminal 111 or the chassis power generation power input terminal 112), the black line represents the cable that provides 380V AC voltage from the second type of power input terminal (i.e., the high-energy battery inverter power input terminal 113), the blue line represents the control cable, the brown line represents the CAN communication cable, and the green line represents the Ethernet communication cable.

[0066] In the technical solution provided by the embodiment of the present invention, the AC voltage provided by multiple power input terminals can be effectively distributed and then output, thereby realizing redundant power supply for vehicle-mounted equipment, improving the reliability of the vehicle-mounted equipment, and improving the performance of the vehicle.

[0067] Figure 3 A schematic diagram of a distribution box provided by an embodiment of the present invention, such as Figure 3 As shown, in the embodiment of the present invention, a 7U-19 inch cabinet drawer form is adopted to design the distribution box. A plurality of status indicator lights and a plurality of lighted buttons are arranged on the front of the distribution box. Among them, the plurality of status indicator lights include an operation indicator light, a fault indicator light and a power input terminal indicator light, and the power input terminal indicator light includes an external AC power supply indicator light, a chassis power generation power supply indicator light and a high-energy battery inverter power supply indicator light. The plurality of lighted buttons include a fault reset button, a main power switch button and at least one load output button. The at least one load output button includes a first load button, a second load button, a third load button, a fourth load button, a fifth load button, a sixth load button and a seventh load button.

[0068] In an embodiment of the present invention, the status indicator light is used to indicate different states of the distribution box. Specifically, the operation indicator light is used to indicate the operation state of the display control module. When the operation indicator light is on, it indicates that the input power supply and the display control module of the distribution box have been powered on and started, and can work normally; when the operation indicator light is off, it indicates that the input power supply and the display control module of the distribution box are not powered on and cannot work normally. The fault indicator light is used to indicate the fault state of the distribution box; when the fault indicator light is on, it indicates that a fault has occurred inside the distribution box; when the fault indicator light is off, it indicates that no fault has occurred inside the distribution box. The power input terminal indicator light is used to indicate the power supply state of the power input terminal, and each power input terminal indicator light corresponds to a power input terminal. When the power input terminal indicator light is on, it indicates that the power input terminal is supplying power to the distribution box; when the power input terminal indicator light is off, it indicates that the power input terminal is not supplying power to the distribution box.

[0069] In the embodiment of the present invention, a circuit breaker operation panel protection shell is also provided on the front of the distribution box, and the circuit breaker operation panel protection shell is fixed to the distribution box by a protection knob. The circuit breaker operation panel protection shell is opened by rotating the protection knob to display the circuit breaker operation panel. The circuit breaker operation panel is provided with a plurality of circuit breaker switches, and each circuit breaker corresponds to a circuit breaker switch. The user can control the state of the circuit breaker through the circuit breaker switch to turn on or off the power supply of the output branch where the circuit breaker is located.

[0070] In the embodiment of the present invention, a fault buzzer is also provided on the front of the distribution box, and the fault buzzer is used to emit a buzzer sound when a fault occurs in the distribution box, so as to remind the user that a fault occurs in the distribution box.

[0071] In the embodiment of the present invention, the fault reset button is used to clear the fault state.

[0072] In the embodiment of the present invention, an upgrade test interface is also provided on the front of the distribution box, and the upgrade test interface is used to implement software testing and upgrading.

[0073] In an embodiment of the present invention, when any power input terminal supplies power to the distribution box, the power input terminal indicator light corresponding to the power input terminal lights up. At this time, the user presses the main power switch button, and the indicator light of the main power switch button lights up. When the display control module works normally, the operation indicator light lights up. If a fault occurs inside the distribution box, the fault indicator light lights up, and the light color is displayed in red to effectively remind the user that the distribution box has a fault. If there is no fault inside the distribution box, the fault display light goes out, and the circuit breaker on the circuit breaker operation panel is closed according to the use requirements, and the corresponding load output button is pressed to realize the output of this line. At this time, the light color of the load output button is green.

[0074] In the embodiment of the present invention, a quick-connect aviation plug is used at the rear of the distribution box to facilitate plugging and unplugging and maintenance. In addition, aviation plugs of different types are selected according to the power size of the load to distinguish, so as to prevent different loads from being plugged into the wrong interface, thereby improving the user experience.

[0075] In the technical solution provided by the embodiment of the present invention, the AC voltage provided by multiple power input terminals can be effectively distributed and then output, thereby realizing redundant power supply for vehicle-mounted equipment, improving the reliability of the vehicle-mounted equipment, and improving the performance of the vehicle.

[0076] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A power supply control circuit, characterized in that: The power supply control circuit comprises: A plurality of power input terminals, used for providing a first AC voltage; A safety protection module, used for monitoring leakage current of the plurality of power input terminals to implement leakage protection of the power supply control circuit; A transformer, used for transforming the first AC voltage to generate a second AC voltage; An AC power distribution module, used for monitoring voltage parameters and current parameters, so as to realize voltage protection and current protection of the power supply control circuit; A display control module, used for providing input display of the plurality of power input terminals and output display of the plurality of output branches, and for generating device control instructions according to received host computer control instructions; An AC contactor, used to control the coil to be energized or de-energized according to the control instructions of the device, so as to control the main circuit to be energized or de-energized; Multiple output branches for powering loads; The circuit breaker is used to implement overcurrent protection, overload protection and short circuit protection for the multiple output branches.

2. The power supply control circuit according to claim 1, characterized in that: The multiple power input terminals are electrically connected to the safety protection module; The safety protection module is electrically connected to the transformer and the AC power distribution module respectively; The transformer is electrically connected to the AC power distribution module; The AC power distribution module is electrically connected to the display control module and the AC contactor respectively; The display control module is electrically connected to the AC contactor; The circuit breaker is electrically connected to the AC contactor and the load respectively.

3. The power supply control circuit according to claim 1, characterized in that: The power supply control circuit also includes: The auxiliary power supply module is electrically connected to the transformer and the display control module respectively, and is used to convert the second AC voltage into a first DC voltage, and after combining and stabilizing the first DC voltage and the second DC voltage input from the chassis battery, provide a DC control voltage for the display control module and the control components in the power supply control circuit; or, after stabilizing the second DC voltage input from the chassis battery, provide a DC control voltage for the display control module and the control components in the power supply control circuit.

4. The power supply control circuit according to claim 1, characterized in that: The power supply control circuit also includes: An Ethernet communication module, the Ethernet communication module is electrically connected to the display control module, and the Ethernet communication module is used to convert received Ethernet data into controller area network (CAN) bus data recognizable by the display control module.

5. The power supply control circuit according to claim 1, characterized in that: The power supply control circuit also includes a lightning protection module, which is electrically connected to the safety protection module and the transformer respectively, and is used to protect the power supply control circuit from high transient overvoltage hazards during lightning strikes.

6. The power supply control circuit according to claim 1, characterized in that: The safety protection module is specifically used to control the main circuit to be powered off when the instantaneous leakage current is greater than or equal to a first protection threshold, or when the accumulated leakage current is greater than or equal to a second protection threshold, and the first protection threshold is less than the second protection threshold.

7. The power supply control circuit according to claim 1, characterized in that: The device control instructions include an opening instruction and a closing instruction; the AC contactor includes a coil; The AC contactor is specifically used to control the coil to lose power in response to the opening instruction so as to cut off power to the main circuit; or, in response to the closing instruction, control the coil to be energized so as to energize the main circuit.

8. The power supply control circuit according to claim 1, characterized in that: The multiple power input terminals include an external AC power input terminal, a chassis power generation power input terminal and a high-energy battery inverter power input terminal; The power supply priorities of the multiple power input terminals are, from high to low, external AC power supply input terminal, chassis power generation power supply input terminal, and high-energy battery inverter power supply input terminal. 9 . The power supply control circuit according to claim 1 , wherein the safety protection module, the AC power distribution module and the display control module communicate with each other via a CAN bus.

10. A distribution box, characterized in that: The distribution box comprises: A plurality of status indicator lights, used to indicate different states of the distribution box; A plurality of lighted buttons, used to indicate different states of the distribution box by light colors when the lighted buttons are pressed; A circuit breaker operation panel is provided with a plurality of circuit breaker switches, and the circuit breaker switches are used to control the state of the circuit breaker to connect or disconnect the power supply of the output branch where the circuit breaker is located.

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