Power supply control circuit and device

Abstract

The present application relates to the technical field of power supply control, and in particular to a power supply control circuit and device, including a signal source, a logic control module, a controller trigger module and a relay control module; the relay control module includes a first control unit and a second control unit; the input end of the logic control module is connected to the signal source, and the output end of the logic control module is connected to the first control unit, which is used to receive a trigger level signal sent by the signal source, and send a corresponding first relay control signal to the first control unit according to the trigger level signal to control the on and off of the first control unit; the input end of the controller trigger module is connected to the signal source, and the output end of the controller trigger module is connected to the second control unit, which is used to receive a trigger level signal, and send a corresponding second relay control signal to the second control unit according to the trigger level signal to control the on and off of the second control unit. The present application can achieve the beneficial effect of improving the fault tolerance rate of on-off control of the power system.

Description

Technical Field

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

[0002] Relays are widely used to control the on and off of circuits in various electronic devices and industrial control systems. However, due to electrical noise, component aging, physical damage or other electromagnetic interference, relays may not respond to control signals correctly, resulting in control instructions not being executed correctly. This failure may cause system control failure, increase the risk of equipment damage, and even endanger personnel safety. Therefore, improving the on-off fault tolerance of power supply control is crucial to ensure the reliability of the entire system. Utility Model Content

[0003] The embodiments of the present application provide a power supply control circuit and device, which can achieve the beneficial effect of improving the fault tolerance of on-off control of a power consumption system.

[0004] In a first aspect, the present application provides a power supply control circuit, comprising a signal source, a logic control module, a controller trigger module and a relay control module;

[0005] The relay control module includes a first control unit and a second control unit;

[0006] The input end of the logic control module is connected to the signal source, and the output end of the logic control module is connected to the first control unit, for receiving the trigger level signal sent by the signal source, and sending a corresponding first relay control signal to the first control unit according to the trigger level signal, so as to control the on and off of the first control unit;

[0007] The input end of the controller trigger module is connected to the signal source, and the output end of the controller trigger module is connected to the second control unit, which is used to receive the trigger level signal and send a corresponding second relay control signal to the second control unit according to the trigger level signal to control the on and off of the second control unit.

[0008] By adopting the above technical solution, the trigger level signal sent by the signal source is divided into two paths. One path is through the logic control module for logic operation, and the pure hardware control sends the corresponding first relay control signal to control the on and off of the first control unit; the other path is received by the controller trigger module and processed by the corresponding controller to obtain the second relay control signal, and the second relay control signal is used to control the on and off of the second control unit. Combining pure hardware control and software (controller) processing to perform relay on and off control reduces the situation where the relay cannot correctly respond to the on and off control signal, thereby improving the fault tolerance rate of the on and off control of the power system.

[0009] Optionally, the signal source includes a control signal source and a sensor signal source, and the logic control module includes a first AND gate, a second AND gate and a third AND gate;

[0010] The two input ends of the first AND gate are connected to the control signal source, and the output end of the first AND gate is connected to an input end of the third AND gate, for receiving the level signal sent by the control signal source, and sending the corresponding first AND gate output signal according to the level signal sent by the control signal source;

[0011] The two input ends of the second AND gate are connected to the sensing signal source, and the output end of the second AND gate is connected to another input end of the third AND gate, for receiving the level signal sent by the sensing signal source, and sending a corresponding second AND gate output signal according to the level signal sent by the sensing signal source;

[0012] The output end of the third AND gate is connected to the input end of the first control unit, and is used to derive and send the corresponding third AND gate output signal to the first control unit according to the first AND gate output signal and the second AND gate output signal, so as to control the on and off of the first control unit.

[0013] By adopting the above technical solution, through the setting of three AND gates, no matter whether the first AND gate and / or the second AND gate receives the signal corresponding to the shutdown relay, the third AND gate output signal corresponding to the shutdown relay can be output, and the inputs of the first AND gate and the second AND gate are derived from different signal sources, including at least two different signal sources, one is direct on-off control; the other is input collection early warning control, such as smoke alarm, flood warning, etc., which can be triggered as long as one end sends a shutdown signal.

[0014] Optionally, the first control unit includes a first resistor, a second resistor, a third resistor, a first transistor, and a relay;

[0015] One end of the first resistor is connected to the output end of the third AND gate, and the other end is connected to the base of the first transistor and one end of the second resistor, the other end of the second resistor is grounded, and the emitter of the first transistor is grounded;

[0016] The collector of the first transistor is connected to one end of the third resistor and the second end of the relay, and the other end of the third resistor is connected to an external first DC signal source and the first end of the relay.

[0017] By adopting the above technical solution, when the output signal of the third AND gate is a signal for controlling the relay to shut down, which is a high level in the present embodiment, the high level signal passes through the first resistor and the second resistor to the ground, thereby raising the base potential of the first transistor, making the first transistor turned on, thereby conducting the path from the first DC signal source, the third resistor, and the first transistor to the ground, thereby shutting off the power supply to the relay. After the power supply to the relay is shut off, the path connection between the positive and negative poles of the bus is cut off.

[0018] Optionally, the first control unit further includes a first diode, a positive electrode of the first diode is connected to a connection point between the first transistor and the relay, and a negative electrode of the first diode is connected to a connection point between the first DC signal source and the relay.

[0019] By adopting the above technical solution, the current direction is ensured according to the unidirectional conductivity of the diode, and the current backflow is prevented from damaging the relay, thereby increasing the service life of the device and ensuring the normal operation of the device.

[0020] Optionally, the controller trigger module includes a first optocoupler, a second optocoupler, and a single-chip microcomputer;

[0021] The input end of the first optical coupler is connected to the control signal source, and the output end of the first optical coupler is connected to an input end of the single chip microcomputer;

[0022] The input end of the second optical coupler is connected to the sensing signal source, and the output end of the second optical coupler is connected to another input end of the single chip microcomputer;

[0023] The output end of the single chip microcomputer is connected to the input end of the second control unit.

[0024] By adopting the above technical solution, each optocoupler receives an input from a signal source. For example, one may be a control signal manually operated by relevant personnel, that is, the relevant personnel actively control the on and off of the busbar, and then send a signal to the corresponding optocoupler, which is the first optocoupler in this embodiment; another may be an early warning signal collected by a relevant sensor, such as smoke, floods, etc., and a signal is sent to the corresponding optocoupler when the above critical situation is detected, which is the second optocoupler in this embodiment. Through the separation of optocouplers, it is possible to avoid the situation where the instantaneous voltage at the signal source end is too high and affects other circuits, thereby improving the reliability of the circuit.

[0025] Optionally, the second control unit includes a first MOS tube, a third resistor, a fourth resistor, a second MOS tube, a fifth resistor and a sixth resistor;

[0026] The third end of the relay is connected to the positive pole of the busbar, and the fourth end is connected to the negative pole of the busbar;

[0027] The source of the first MOS transistor is connected to the fifth end of the relay, the gate of the first MOS transistor is connected to one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected to the output end of the single chip computer, and the other end of the fourth resistor is grounded;

[0028] The source of the second MOS tube is connected to the sixth end of the relay, the gate of the second MOS tube is connected to one end of the fifth resistor and one end of the sixth resistor, the other end of the fifth resistor is connected to the output end of the single chip microcomputer, and the other end of the sixth resistor is grounded.

[0029] By adopting the above technical solution, the controller receives the level signal sent by any optocoupler among the multiple optocouplers, and sends the corresponding high and low levels to the gate of the first MOS tube and the gate of the second MOS tube according to the received signal, so as to control the on and off of the two MOS tubes. When it is necessary to shut down, the two MOS are turned off, thereby disconnecting the path from the positive and negative bus bars to the ground through the relay, thereby disconnecting the bus power supply in a manner different from the above logical judgment, thereby ensuring that the power supply is actually disconnected and improving the reliability of power supply control.

[0030] Optionally, the second control unit includes a first capacitor and a second capacitor;

[0031] One end of the first capacitor is connected to the connection point between the fifth end of the relay and the first MOS tube, and the other end of the first capacitor is grounded;

[0032] One end of the second capacitor is connected to the connection point between the sixth end of the relay and the second MOS tube, and the other end of the second capacitor is grounded.

[0033] By adopting the above technical solution, the first capacitor and the second capacitor are grounded to form a ripple effect, so as to avoid interference signals from affecting power supply control, thereby ensuring the reliability of power supply control and the user experience of users using related products.

[0034] A second aspect of the present application provides a power supply control device equipped with the above-mentioned power supply control circuit.

[0035] In summary, the beneficial effects of the present application are as follows: the trigger level signal sent by the signal source is divided into two paths, one of which is subjected to logic operation by the logic control module, and the pure hardware control sends the corresponding first relay control signal to control the on and off of the first control unit; the other path is received by the controller trigger module and processed by the corresponding controller to obtain the second relay control signal, and the second relay control signal is used to control the on and off of the second control unit. Combining pure hardware control and software (controller) processing to perform relay on and off control reduces the situation where the relay cannot correctly respond to the on and off control signal, thereby improving the fault tolerance rate of the on and off control of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a module schematic diagram of a power supply control circuit provided in an embodiment of the present application;

[0037] Figure 2 is a circuit schematic diagram of a first control path of a power supply control circuit provided in an embodiment of the present application;

[0038] Figure 3 It is a circuit schematic diagram of the second control path of the power supply control circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following examples will help those skilled in the art to further understand the effects of the present application, but are not intended to limit the present application in any form. It should be noted that, for those of ordinary skill in the art, several modifications and improvements may be made without departing from the concept of the present application. These all fall within the scope of protection of the present application.

[0040] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0041] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0042] It should also be understood that the term “and / or” used in the specification and appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0043] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0044] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0045] The present application is further described in detail below in conjunction with the accompanying drawings.

[0046] Reference Figure 1 , Figure 1 : is a module schematic diagram of a power supply control circuit provided in an embodiment of the present application, including a signal source, a logic control module 1, a controller trigger module 2 and a relay control module 3, wherein the relay control module 3 includes a first control unit and a second control unit, and each module is specifically described below;

[0047] About the signal source: the signal source includes a control signal source and a sensor signal source. The control signal source refers to a signal issued by relevant personnel or a preset program setting to actively control the on-off of the power supply, such as regular maintenance, disconnecting the power supply according to actual needs, etc.; another situation is to automatically identify the warning situation that needs to shut off the power supply through sensors and other sensor devices. It can be through sensors or other methods such as image acquisition to identify. After identification, the corresponding level signal is sent to the logic control module 1 or the controller trigger module 2 to perform the corresponding operation.

[0048] Regarding the logic control module 1: the input end of the logic control module 1 is connected to the signal source, and the output end of the logic control module 1 is connected to the first control unit, for receiving a trigger level signal sent by the signal source, and sending a corresponding first relay control signal to the first control unit according to the trigger level signal, so as to control the on and off of the first control unit.

[0049] Specifically, the first path is the pure hardware-controlled power supply circuit proposed in this application. Taking the need to shut down as an example, the signal source sends a signal for shutting down to the logic control module 1. In this embodiment, the logic control module 1 is formed by a combination of multiple AND gates. If any one of the multiple pins receives a level signal for shutting down, that is, a signal to control the shutdown, the switch device set in the first control unit (the first transistor Q1 in this embodiment) is turned on, thereby shutting down the bus relay to achieve the purpose of stopping power supply. Otherwise, the relay is turned on. The principle is similar and will not be repeated here. Please refer to the following Figure 2 , Figure 2 It is a circuit schematic diagram of the first control path of the power supply control circuit provided in the embodiment of the present application, including a specific design embodiment of the circuit structure of the logic control module 1 and the first control unit, which is specifically described below:

[0050] The logic control module 1 includes a first AND gate U1A, a second AND gate U1B and a third AND gate U1C;

[0051] The two input ends of the first AND gate U1A are connected to the control signal source, and the output end of the first AND gate U1A is connected to an input end of the third AND gate U1C, for receiving the level signal sent by the control signal source, and sending the corresponding first AND gate U1A output signal according to the level signal sent by the control signal source;

[0052] The two input ends of the second AND gate U1B are connected to the sensing signal source, and the output end of the second AND gate U1B is connected to the other input end of the third AND gate U1C, for receiving the level signal sent by the sensing signal source, and sending the corresponding second AND gate U1B output signal according to the level signal sent by the sensing signal source;

[0053] The output end of the third AND gate U1C is connected to the input end of the first control unit, and is used to derive and send the corresponding third AND gate U1C output signal to the first control unit according to the first AND gate U1A output signal and the second AND gate U1B output signal, so as to control the on and off of the first control unit.

[0054] Specifically, through the setting of three AND gates, no matter whether the first AND gate U1A and / or the second AND gate U1B receives the signal corresponding to the shutdown relay, the output signal of the third AND gate U1C corresponding to the shutdown relay can be output, and the inputs of the first AND gate U1A and the second AND gate U1B are derived from different signal sources, including at least two different signal sources, one is direct on-off control; the other is input collection early warning control, such as smoke alarm, flood warning, etc., which can be triggered as long as one end sends a shutdown signal.

[0055] More specifically, in this embodiment, the first AND gate U1A is used to receive signals sent by the control signal source, including IN_STOP1 and IN_RUN1. When the power supply is actively controlled to be shut down, IN_STOP1 is high and IN_RUN1 is low. In this case, regardless of the level status of the input terminals of other AND gates, the third AND gate U1C outputs a high level to the second control unit. In this embodiment, if the third AND gate U1C outputs a high level, the control bus is disconnected, thereby cutting off the power supply; and the second AND gate U1B is used to receive alarm collection signals, including but not limited to smoke alarms and flood alarms, and signal inputs can be increased according to actual needs. In this embodiment, taking floods as an example, when it is determined through sensors, image acquisition and other methods that the relevant power system is at risk of being damaged by water, IN_STOP2 is pulled high and IN_RUN2 is pulled low, so that the third AND gate U1C outputs a high level signal.

[0056] The first control unit controls the on / off state of the internal switch device according to the high and low level states corresponding to the output signal of the third AND gate U1C. Figure 2 The first control unit is further described in detail:

[0057] The first control unit includes a first resistor R1, a second resistor R2, a third resistor R3, a first transistor Q1, and a relay;

[0058] One end of the first resistor R1 is connected to the output end of the third AND gate U1C, and the other end is connected to the base of the first transistor Q1 and one end of the second resistor R2, the other end of the second resistor R2 is grounded, and the emitter of the first transistor Q1 is grounded;

[0059] The collector of the first transistor Q1 is connected to one end of the third resistor R3 and the second end of the relay, and the other end of the third resistor R3 is connected to an external first DC signal source and the first end of the relay;

[0060] It also includes a first diode D1, wherein the anode of the first diode D1 is connected to the connection point between the first transistor Q1 and the relay, and the cathode of the first diode D1 is connected to the connection point between the first DC signal source and the relay.

[0061] Specifically, the first resistor R1 and the second resistor R2 are used for voltage division and pull-up and pull-down. The first transistor Q1 collects the voltage value between the first resistor R1 and the second resistor R2 to perform on-off control. When the base of the first transistor Q1 is pulled high, it is turned on. After being turned on, the first DC signal source passes through the third resistor R3 and the first transistor Q1 to the ground, thereby stopping power supply to the first end and the second end of the relay. After the power supply to the relay is cut off, the magnetic attraction circuit of the internal electronic switch is changed to cut off the connection between the positive and negative poles of the busbar (i.e., the LSD1 and LSD2 ports). For example, in this embodiment, the original fifth end connected to the third section is changed to the fifth end connected to the seventh end, etc.

[0062] More specifically, according to the unidirectional conductivity of the diode, the current direction is ensured to avoid current backflow and damage to the relay, thereby increasing the service life of the device and ensuring the normal operation of the device. In addition, an indicator LED is included, which is used to determine whether the relay is disconnected, and the indicator LED is off when disconnected.

[0063] It is worth noting that compared with the power supply control line of the second path, the processing speed of the first path is relatively faster, and the bus control can be directly cut off without going through the relevant controller. In some possible embodiments, the controller is powered by the bus. If the first path fails to shut down, the second path shutdown is started accordingly. If the first path is shut down, the controller loses power and does not perform the shutdown control of the second path, thereby ensuring the reliability of power supply control.

[0064] Regarding the controller trigger module 2: the input end of the controller trigger module 2 is connected to the signal source, and the output end of the controller trigger module 2 is connected to the second control unit, which is used to receive the trigger level signal and send a corresponding second relay control signal to the second control unit according to the trigger level signal to control the on and off of the second control unit.

[0065] Specifically, the second path is a microcontroller such as a single-chip microcomputer receiving a signal sent by a signal source, and correspondingly controlling the on and off of the second control unit according to the signal sent by the signal source, that is, the power supply control path processed by the processor is received by the controller trigger module 2 and processed by the corresponding controller to obtain a second relay control signal, which is used to control the on and off of the second control unit. For the combination of pure hardware control and software (controller) processing for relay on and off control, please refer to Figure 3 , Figure 3 : is a circuit schematic diagram of the second control path of the power supply control circuit provided in the embodiment of the present application, which is described in detail below:

[0066] The controller trigger module 2 includes a first optical coupler U2, a second optical coupler U3, and a single chip microcomputer;

[0067] The input end of the first optical coupler U2 is connected to the control signal source, and the output end of the first optical coupler U2 is connected to an input end of the single chip microcomputer;

[0068] The input end of the second optical coupler U3 is connected to the sensing signal source, and the output end of the second optical coupler U3 is connected to another input end of the single chip microcomputer;

[0069] The output end of the single chip microcomputer is connected to the input end of the second control unit.

[0070] Specifically, each optocoupler receives an input from a signal source. For example, one may be a control signal manually operated by a relevant person, that is, the relevant person actively controls the on and off of the busbar, and then sends a signal to the corresponding optocoupler, which is the first optocoupler U2 in this embodiment; another may be an early warning signal collected by a relevant sensor, such as smoke, floods, etc., and a signal is sent to the corresponding optocoupler when the above critical situation is detected, which is the second optocoupler U3 in this embodiment. Through the separation of optocouplers, it is possible to avoid the situation where the instantaneous voltage at the signal source end is too high and affects other circuits, thereby improving the reliability of the circuit.

[0071] More specifically, each optocoupler includes two photodiodes and phototransistors, which are defined as the first photodiode, the second photodiode, the first phototransistor, and the second phototransistor, respectively. The positive electrode of each photodiode is connected to an external DC signal source through a resistor, and the negative electrode is connected to a shutdown signal (such as IN_STOP1) or a running signal (such as IN_RUN1); one end of each phototransistor is connected to an external DC signal source and the MCU through a resistor, and the other end is grounded. Take the need to shut down as an example. For example, if the IN_STOP1 port sends a high-level signal, the corresponding phototransistor is not turned on, and the DC signal is output to the MCU, that is, a high-level signal is given to the MCU. On the contrary, if the phototransistor is turned on, the DC signal is grounded, and the MCU receives a low-level signal. If the MCU receives a signal for shutting down the power supply, the corresponding output level signal is sent to the second control unit. The following is a specific description of the second control unit:

[0072] The second control unit includes a first MOS tube Q2, a third resistor R3, a fourth resistor R4, a second MOS tube Q3, a fifth resistor R5 and a sixth resistor R6;

[0073] The third end of the relay is connected to the bus positive electrode LSD1, and the fourth end is connected to the bus negative electrode LSD2;

[0074] The source of the first MOS transistor Q2 is connected to the fifth end of the relay, the gate of the first MOS transistor Q2 is connected to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the third resistor R3 is connected to the output end of the single chip computer, and the other end of the fourth resistor R4 is grounded;

[0075] The source of the second MOS transistor Q3 is connected to the sixth end of the relay, the gate of the second MOS transistor Q3 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, the other end of the fifth resistor R5 is connected to the output end of the single chip computer, and the other end of the sixth resistor R6 is grounded;

[0076] The second control unit includes a first capacitor C1 and a second capacitor C2;

[0077] One end of the first capacitor C1 is connected to the connection point between the fifth end of the relay and the first MOS transistor Q2, and the other end of the first capacitor C1 is grounded;

[0078] One end of the second capacitor C2 is connected to the connection point between the sixth end of the relay and the second MOS transistor Q3 , and the other end of the second capacitor C2 is grounded.

[0079] Specifically, the controller receives a level signal sent by any optocoupler among the multiple optocouplers, and sends corresponding high and low levels to the gate of the first MOS tube Q2 and the gate of the second MOS tube Q3 according to the received signal. In this embodiment, the DOH1 port and the DOH2 port output a low level, so that the two MOS are disconnected. When it is necessary to shut down, the two MOS are turned off, thereby disconnecting the path from the positive and negative bus bars to the ground through the relay, thereby disconnecting the bus power supply in a manner different from the above-mentioned logical judgment, thereby ensuring that the power supply is actually disconnected and improving the reliability of power supply control.

[0080] More specifically, by grounding the first capacitor C1 and the second capacitor C2, a ripple effect is formed to prevent interference signals from affecting power supply control, thereby ensuring the reliability of power supply control and the user experience of users using related products.

[0081] A second aspect of the present application provides a power supply control device equipped with the above-mentioned power supply control circuit.

[0082] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A power supply control circuit, characterized in that: It includes a signal source, a logic control module, a controller trigger module and a relay control module; The relay control module includes a first control unit and a second control unit; The input end of the logic control module is connected to the signal source, and the output end of the logic control module is connected to the first control unit, for receiving the trigger level signal sent by the signal source, and sending a corresponding first relay control signal to the first control unit according to the trigger level signal, so as to control the on and off of the first control unit; The input end of the controller trigger module is connected to the signal source, and the output end of the controller trigger module is connected to the second control unit, which is used to receive the trigger level signal and send a corresponding second relay control signal to the second control unit according to the trigger level signal to control the on and off of the second control unit.

2. The power supply control circuit according to claim 1, characterized in that: The signal source includes a control signal source and a sensor signal source, and the logic control module includes a first AND gate, a second AND gate and a third AND gate; The two input ends of the first AND gate are connected to the control signal source, and the output end of the first AND gate is connected to an input end of the third AND gate, for receiving the level signal sent by the control signal source, and sending the corresponding first AND gate output signal according to the level signal sent by the control signal source; The two input ends of the second AND gate are connected to the sensing signal source, and the output end of the second AND gate is connected to another input end of the third AND gate, for receiving the level signal sent by the sensing signal source, and sending a corresponding second AND gate output signal according to the level signal sent by the sensing signal source; The output end of the third AND gate is connected to the input end of the first control unit, and is used to derive and send the corresponding third AND gate output signal to the first control unit according to the first AND gate output signal and the second AND gate output signal, so as to control the on and off of the first control unit.

3. The power supply control circuit according to claim 2, characterized in that: The first control unit includes a first resistor, a second resistor, a third resistor, a first transistor, and a relay; One end of the first resistor is connected to the output end of the third AND gate, and the other end is connected to the base of the first transistor and one end of the second resistor, the other end of the second resistor is grounded, and the emitter of the first transistor is grounded; The collector of the first transistor is connected to one end of the third resistor and the second end of the relay, and the other end of the third resistor is connected to an external first DC signal source and the first end of the relay.

4. The power supply control circuit according to claim 3, characterized in that: The first control unit further includes a first diode, wherein an anode of the first diode is connected to a connection point between the first transistor and the relay, and a cathode of the first diode is connected to a connection point between the first DC signal source and the relay.

5. The power supply control circuit according to claim 3, characterized in that: The controller trigger module includes a first optocoupler, a second optocoupler, and a single-chip microcomputer; The input end of the first optical coupler is connected to the control signal source, and the output end of the first optical coupler is connected to an input end of the single chip microcomputer; The input end of the second optical coupler is connected to the sensing signal source, and the output end of the second optical coupler is connected to another input end of the single chip microcomputer; The output end of the single chip microcomputer is connected to the input end of the second control unit.

6. The power supply control circuit according to claim 5, characterized in that: The second control unit includes a first MOS tube, a third resistor, a fourth resistor, a second MOS tube, a fifth resistor and a sixth resistor; The third end of the relay is connected to the positive pole of the busbar, and the fourth end is connected to the negative pole of the busbar; The source of the first MOS transistor is connected to the fifth end of the relay, the gate of the first MOS transistor is connected to one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected to the output end of the single chip computer, and the other end of the fourth resistor is grounded; The source of the second MOS tube is connected to the sixth end of the relay, the gate of the second MOS tube is connected to one end of the fifth resistor and one end of the sixth resistor, the other end of the fifth resistor is connected to the output end of the single chip microcomputer, and the other end of the sixth resistor is grounded.

7. The power supply control circuit according to claim 6, characterized in that: The second control unit includes a first capacitor and a second capacitor; One end of the first capacitor is connected to the connection point between the fifth end of the relay and the first MOS tube, and the other end of the first capacitor is grounded; One end of the second capacitor is connected to the connection point between the sixth end of the relay and the second MOS tube, and the other end of the second capacitor is grounded.

8. A power supply control device, characterized in that: The device is equipped with a power supply control circuit as described in any one of claims 1 to 7.

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