A high reliability power switch circuit

Abstract

The present invention discloses a high-reliability power switch circuit, comprising: a step-down module, an opening and closing module, an indicator light module, a switching power supply module, a relay control drive module, a shutdown and power-off module, and a power self-locking module; the step-down module is respectively connected to the opening and closing module and the indicator light module, the opening and closing module is also respectively connected to the switching power supply module and the shutdown and power-off module, the switching power supply module is respectively connected to the power self-locking module, the shutdown and power-off module, and the indicator light module, the shutdown and power-off module is connected to the relay control drive module, and the relay control drive module is connected to the power self-locking module. The present invention has high reliability and can avoid accident risks and equipment damage caused by the wrong start-up of equipment in a complex electromagnetic environment.

Description

Technical Field

[0001] The invention relates to the field of switch circuits, and in particular to a high-reliability power switch circuit. Background Art

[0002] The existing similar circuits use low-power power supplies to supply power to the microcontroller or dedicated chip for a long time to realize the power on and off. Please refer to Figure 3 The prior art has a power switch circuit with a power on / off function, which is used in household appliances and industrial equipment. In the off state, the single-chip microcomputer or the dedicated control chip is always in the power supply working state, which is easily disturbed and malfunctions in a complex electromagnetic environment, and the low-power power supply is always online and easily damaged. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a highly reliable power switch circuit, which controls the power on and off of the device by a pure hardware circuit, has high reliability, and can avoid the risk of accidents and equipment damage caused by accidental startup of the device in a complex electromagnetic environment.

[0004] Based on this, the present invention provides a high-reliability power switch circuit, the circuit comprising:

[0005] Step-down module, opening and closing module, indicator light module, switching power supply module, relay control drive module, shutdown and power-off module and power self-locking module;

[0006] The step-down module is connected to the switch module and the indicator light module respectively, the switch module is also connected to the switch power module and the shutdown power module respectively, the switch power module is connected to the power self-locking module, the shutdown power module and the indicator light module respectively, the shutdown power module is connected to the relay control drive module, and the relay control drive module is connected to the power self-locking module;

[0007] The step-down module is used to convert the voltage from AC 220V to DC 12V. When the switch module receives the user's opening signal, the switch power supply module converts the voltage from AC 220V to DC 5V to supply the shutdown and power-off module, the indicator light module and the power self-locking module. The indicator light module indicates the power-on status, the shutdown and power-off module is turned on, the power self-locking module is turned on, and the relay control drive module supplies power to the load;

[0008] When the opening and closing module receives a closing signal from the user, the shutdown and power-off module is closed, the power self-locking module is closed, the switch power module is closed, the indicator light module indicates the closing status, and the relay control drive module stops supplying power to the load.

[0009] Wherein, the step-down module comprises:

[0010] A first resistor, a third resistor, a fourth capacitor, a twelfth capacitor, a thirteenth capacitor, a third diode, and a rectifier bridge;

[0011] After the first resistor is connected in parallel with the twelfth capacitor, one end of the first resistor is connected to the L end of the AC 220V voltage, and the other end is connected to the fourth end of the rectifier bridge. After the third resistor is connected in parallel with the thirteenth capacitor, one end of the third resistor is connected to the N end of the AC 220V voltage, and the other end is connected to the second end of the rectifier bridge. The third end of the rectifier bridge is grounded, the first end of the rectifier bridge is respectively connected to one end of the fourth capacitor and the negative electrode of the third diode, the other end of the fourth capacitor is grounded, the positive electrode of the third diode is also grounded, and the first end of the rectifier bridge is respectively connected to the switch module and the indicator light module.

[0012] Wherein, the opening and closing module comprises:

[0013] A switch button, a fourth resistor, a fifth diode and a third relay;

[0014] The output end of the step-down module is connected to one end of the switch button, and the other end of the switch button is respectively connected to one end of the fourth resistor, the cathode of the fifth diode and one end of the third relay, the anode of the fifth diode and the other end of the third relay are both grounded, and the other end of the fourth resistor is connected to the shutdown and power-off module.

[0015] Wherein, the indicator light module comprises:

[0016] A first light emitting diode, a second light emitting diode, a sixth resistor, a seventh resistor, a first relay and an eighth diode;

[0017] The output end of the step-down module is respectively connected to one end of the first light-emitting diode and one end of the second light-emitting diode, the other end of the first light-emitting diode is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to the first relay, the other end of the second light-emitting diode is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the first relay;

[0018] One end of the first relay and the cathode of the eighth diode are connected to a +5V voltage, and the other end of the first relay and the anode of the eighth diode are both grounded.

[0019] Wherein, the switching power supply module comprises:

[0020] The seventh capacitor and the switching power supply;

[0021] The first end and the second end of the switching power supply are connected to the switch module;

[0022] The fourth terminal of the switching power supply outputs a +5V voltage, one terminal of the seventh capacitor is connected to the +5V voltage, and the other terminal of the seventh capacitor and the third terminal of the switching power supply are both grounded.

[0023] Wherein, the power self-locking module includes:

[0024] a sixth diode and a fifth relay;

[0025] The cathode of the sixth diode and one end of the fifth relay are both connected to a +5V voltage, and the anode of the sixth diode and the other end of the fifth relay are respectively connected to the relay control drive module.

[0026] Wherein, the shutdown and power-off module comprises:

[0027] A fifth capacitor, a fifteenth capacitor, a bistable chip, and an optical coupler;

[0028] One end of the fifth capacitor is respectively connected to the switch module and the first end of the optocoupler, the other end of the fifth capacitor and the second end of the optocoupler are both grounded, the third end of the optocoupler is grounded, the fourth end of the optocoupler is respectively connected to one end of the fifteenth capacitor and the first end of the bistable chip, the other end of the fifteenth capacitor is grounded, the second end and the third end of the bistable chip are both grounded, the sixth end of the bistable chip is connected to a +5V voltage, the fifth end of the bistable chip is suspended, and the fourth end is connected to the relay control drive module.

[0029] Wherein, the relay control drive module includes:

[0030] A second resistor, a fifth resistor, an eighth resistor, a sixteenth capacitor, a second relay, a fourth relay, a fourth diode, a second diode, a first triode, and a third light emitting diode;

[0031] One end of the fifth resistor is connected to the shutdown and power-off module, and the other end of the fifth resistor is respectively connected to one end of the eighth resistor, one end of the sixteenth capacitor and the base of the first transistor, the other end of the eighth resistor, the other end of the sixteenth capacitor and the emitter of the first transistor are all grounded, the collector of the first transistor is respectively connected to the cathode of the third light-emitting diode, one end of the second relay, the anode of the fourth diode, one end of the fourth relay and the anode of the second diode, the anode of the third light-emitting diode is connected to one end of the second resistor, and the other end of the second resistor, the other end of the second relay, the cathode of the fourth diode, the other end of the fourth relay and the cathode of the second diode are all connected to a +5V voltage.

[0032] Wherein, the model of the bistable chip is: MAX16054.

[0033] Wherein, the model of the switching power supply is LD03-23B09R2.

[0034] The present invention has the following advantages:

[0035] 1. The present invention reduces the probability of damage caused by switching power supply failure by removing a small switching power supply with low reliability.

[0036] 2. The present invention eliminates the single-chip microcomputer or dedicated control chip working in the standby state, thereby avoiding input error logic caused by electromagnetic interference during the standby period, thereby preventing the occurrence of power equipment accidents. This improvement not only improves the anti-interference ability in complex electromagnetic environments, but also enhances the durability of the device, and significantly reduces power consumption in the standby state. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 is a schematic diagram of a high-reliability power switch circuit provided by an embodiment of the present invention;

[0039] Figure 2 is a circuit diagram of a high-reliability power switch circuit provided by an embodiment of the present invention;

[0040] Figure 3 It is a circuit diagram of a prior art power switch circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Figure 1 is a schematic diagram of a high-reliability power switch circuit provided by an embodiment of the present invention, the circuit comprising:

[0043] Voltage reduction module 101, switch module 104, indicator light module 103, switch power module 107, relay control drive module 106, shutdown and power-off module 102 and power self-locking module 105;

[0044] The step-down module 101 is connected to the switch module 104 and the indicator light module 103 respectively, the switch module 104 is also connected to the switch power module 107 and the shutdown power module 102 respectively, the switch power module 107 is connected to the power self-locking module 105, the shutdown power module 102 and the indicator light module 103 respectively, the shutdown power module 102 is connected to the relay control drive module 106, and the relay control drive module 106 is connected to the power self-locking module 105;

[0045] The step-down module 101 is used to convert the voltage from AC 220V to DC 12V. When the switch module 104 receives the user's start signal, the switch power supply module 107 converts the voltage from AC 220V to DC 5V to supply the shutdown and power-off module 102, the indicator light module 103 and the power self-locking module 105. The indicator light module 103 indicates the startup status, the shutdown and power-off module 102 is turned on, the power self-locking module 105 is turned on, and the relay control drive module 106 supplies power to the load;

[0046] When the opening and closing module 104 receives a closing signal from the user, the shutdown and power-off module 102 is closed, the power self-locking module 105 is closed, the switch power module 107 is closed, the indicator light module 103 indicates the closing status, and the relay control drive module 106 stops supplying power to the load.

[0047] Figure 2 is a circuit diagram of a high-reliability power switch circuit provided by an embodiment of the present invention, wherein the step-down module comprises:

[0048] A first resistor R1, a third resistor R3, a fourth capacitor C4, a twelfth capacitor C12, a thirteenth capacitor C13, a third diode D3, and a rectifier bridge;

[0049] After the first resistor R1 is connected in parallel with the twelfth capacitor C12, one end is connected to the L end of the AC 220V voltage, and the other end is connected to the fourth end of the rectifier bridge. After the third resistor R3 is connected in parallel with the thirteenth capacitor C13, one end is connected to the N end of the AC 220V voltage, and the other end is connected to the second end of the rectifier bridge. The third end of the rectifier bridge is grounded, the first end of the rectifier bridge is respectively connected to one end of the fourth capacitor C4 and the negative electrode of the third diode D3, the other end of the fourth capacitor C4 is grounded, the positive electrode of the third diode D3 is also grounded, and the first end of the rectifier bridge is respectively connected to the switch module and the indicator light module.

[0050] The twelfth capacitor C12, the thirteenth capacitor C13, the first resistor R1 and the third resistor R3 are all used for voltage reduction. The rectifier bridge is used for rectification, the fourth capacitor C4 is used for filtering, and the third diode D3 is a voltage regulator diode, model 3EZ12D5. The twelfth capacitor C12 and the thirteenth capacitor C13 are both 0.1uF, the first resistor R1 and the third resistor R3 are 27K ohms, the rectifier bridge model is MB10S, and the fourth capacitor C4 is 220uF.

[0051] The main purpose of the step-down module is to convert AC220V into DC12V.

[0052] Specifically, the opening and closing module includes:

[0053] A switch button S1, a fourth resistor R4, a fifth diode D5 and a third relay K3;

[0054] The output end of the step-down module is connected to one end of the switch button S1, and the other end of the switch button S1 is respectively connected to one end of the fourth resistor R4, the cathode of the fifth diode D5 and one end of the third relay K3, the anode of the fifth diode D5 and the other end of the third relay K3 are both grounded, and the other end of the fourth resistor R4 is connected to the shutdown and power-off module.

[0055] The switch button S1 is used to receive the user's switch signal. The fourth resistor R4 is 2K ohms, and the third relay K3 is a double-pole single-throw switch relay.

[0056] When the user presses the switch button S1, the third relay K3 will be turned on, and the DC220V will be energized through the switch power module to output a DC +5V voltage. The +5V voltage will be supplied to the indicator light module, the shutdown power-off module and the power self-locking module.

[0057] Specifically, the indicator light module includes:

[0058] A first light emitting diode LED1, a second light emitting diode LED2, a sixth resistor R6, a seventh resistor R7, a first relay K1 and an eighth diode D8;

[0059] The output end of the step-down module is respectively connected to one end of the first light-emitting diode LED1 and one end of the second light-emitting diode LED2, the other end of the first light-emitting diode LED1 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the first relay K1, the other end of the second light-emitting diode LED2 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the first relay K1;

[0060] One end of the first relay K1 is connected to a cathode of the eighth diode D8 with a voltage of +5V, and the other end of the first relay K1 and an anode of the eighth diode D8 are both grounded.

[0061] The model of the first relay K1 is HFD4-1. The sixth resistor R6 is 1K ohm, and the seventh resistor R7 is 15K ohm.

[0062] Specifically, the switching power supply module includes:

[0063] A seventh capacitor C7 and a switching power supply T1;

[0064] The first end and the second end of the switch power supply T1 are connected to the switch module;

[0065] The fourth terminal of the switch power supply T1 outputs a +5V voltage, one terminal of the seventh capacitor C7 is connected to the +5V voltage, and the other terminal of the seventh capacitor C7 and the third terminal of the switch power supply T1 are both grounded.

[0066] The model of the switching power supply T1 is LD03-23B09R2, and its function is to convert AC220V into DC+5V. The seventh capacitor C7 is 47uF.

[0067] Specifically, the power self-locking module includes:

[0068] a sixth diode D6 and a fifth relay K5;

[0069] The cathode of the sixth diode D6 and one end of the fifth relay K5 are both connected to a +5V voltage, and the anode of the sixth diode D6 and the other end of the fifth relay K5 are respectively connected to the relay control drive module.

[0070] The fifth relay K5 is a double-pole single-throw switch relay.

[0071] Specifically, the shutdown and power-off module includes:

[0072] The fifth capacitor C5, the fifteenth capacitor C15, the bistable chip U1, and the optical coupler U2;

[0073] One end of the fifth capacitor C5 is respectively connected to the opening and closing module and the first end of the optocoupler U2, the other end of the fifth capacitor C5 and the second end of the optocoupler U2 are both grounded, the third end of the optocoupler U2 is grounded, the fourth end of the optocoupler U2 is respectively connected to one end of the fifteenth capacitor C15 and the first end of the bistable chip U1, the other end of the fifteenth capacitor C15 is grounded, the second end and the third end of the bistable chip U1 are both grounded, the sixth end of the bistable chip U1 is connected to a +5V voltage, the fifth end of the bistable chip U1 is suspended, and the fourth end is connected to the relay control drive module.

[0074] The fifth capacitor C5 is 0.01uF, the model of the optical coupler U2 is PC817, the fifteenth capacitor C15 is 510pF, and the model of the bistable chip U1 is MAX16054.

[0075] Specifically, the relay control drive module includes:

[0076] A second resistor R2, a fifth resistor R5, an eighth resistor R8, a sixteenth capacitor C16, a second relay K2, a fourth relay K4, a fourth diode D4, a second diode D2, a first transistor Q1, and a third light emitting diode DS1;

[0077] One end of the fifth resistor R5 is connected to the shutdown and power-off module, and the other end of the fifth resistor R5 is respectively connected to one end of the eighth resistor R8, one end of the sixteenth capacitor C16 and the base of the first transistor Q1, the other end of the eighth resistor R8, the other end of the sixteenth capacitor C16 and the emitter of the first transistor Q1 are all grounded, the collector of the first transistor Q1 is respectively connected to the cathode of the third light-emitting diode DS1, one end of the second relay K2, the anode of the fourth diode D4, one end of the fourth relay K2 and the anode of the second diode D2, the anode of the third light-emitting diode DS1 is connected to one end of the second resistor R2, the other end of the second resistor R2, the first end of the second relay K2, the cathode of the fourth diode D4, the other end of the fourth relay K4 and the cathode of the second diode D2 are all connected to a +5V voltage.

[0078] The fifth resistor R5 is 3K ohms, the third resistor R3 is a current limiting resistor, which is 3K ohms, the sixteenth capacitor C16 is 47uF, the first transistor model is 2SC2655G, and the second resistor R2 is 10K ohms.

[0079] Figure 2 K2A and K4A are switch contact parts of the second relay K2 and the fourth relay K4, and K2B and K4B are coil parts of the second relay K2 and the fourth relay K4.

[0080] Figure 2 The diodes D2, D4, D5, D6, and D8 connected in parallel on the relay coil are voltage reverse electromotive force limiting diodes on the relay inductor coil, and their function is to protect the first transistor Q1 from being damaged by excessive reverse voltage. The current limiting resistor R2 and the indicator light DS1 are the relay working indicator lights.

[0081] The specific principle of the circuit is:

[0082] After the 220V AC power is input, the voltage is reduced by the 12th capacitor C12, the 13th capacitor C13, the first resistor R1 and the third resistor R3, and then rectified by the rectifier bridge D1, filtered by the fourth capacitor C4, and stabilized by the third diode D3 to become a 12V DC power supply. The 12V DC circuit passes through LED2, the current limiting resistor, that is, the sixth resistor R6, and the normally closed relay, that is, the first relay K1 to GND, so that the standby indicator light, that is, the second light-emitting diode LED2, emits light.

[0083] Case 1: When the user presses the power button S1 for the first time, the machine is turned on. The 12V DC power supply passes through the third relay K3 (start relay), and the third relay is energized. The AC 220V power passes through the third relay K3 to energize the switch power supply T1. The switch power supply T1 outputs a +5V voltage. The seventh capacitor is used for smoothing and filtering. The +5V voltage is supplied to the indicator light module, so that the first relay K1 is energized. The first light-emitting diode LED1 (used as a power-on indicator light) passes through the seventh resistor, i.e., the current-limiting resistor R7, to the first relay K1 to GND to form a current loop. The first light-emitting diode LED1 is lit. Since the second light-emitting diode LED2 is disconnected from GND, the second light-emitting diode LED2 is extinguished. The +5V voltage is also supplied to the bistable chip U1 and the fifth relay (self-locking relay) K5. It should be noted that the second relay (load relay) K2 and the fourth relay (load relay) K4, because the bistable chip U1 (Note: before the functional circuit of this machine is turned on, the switching power supply and the bistable chip are not powered, so it has no function against electromagnetic interference after shutting down, so the chip will not malfunction) is powered on. The initial state is that the 4th pin outputs a steady high level, so the steady high level passes through the current limiting resistor, that is, the fifth resistor R5, the sixteenth capacitor (anti-interference capacitor) C16 and the eighth resistor (anti-interference resistor) R8 to the base of the first transistor Q1, so that the first transistor Q1 is turned on, and the load relays controlled on the collector of the first transistor Q1, that is, the second relay K2, the fourth relay K4, and the self-locking relay, that is, the fifth relay K5, are all electrically attracted. The load relays, that is, the second relay K2 and the fourth relay K4, are attracted to supply power to the load, and the self-locking relay, that is, the fifth relay K5, is also connected to 220V after being electrically attracted, and is connected in parallel with the start relay, that is, the third relay K3, to supply power to the switching power supply T1, completing the circuit self-locking and continuous connection. At this time, after releasing the power button S1, since the fifth relay K5 has been energized, it is in a stable self-locking state and remains connected. The load relay, i.e. the second relay K2 and the fourth relay K4, is also always connected to output 220V to supply power to the load.

[0084] Case 2: When the user presses the power button S1 again to shut down the machine, the 12V voltage charges the fifth capacitor C5 through the fourth resistor R4. When the voltage on the fifth capacitor C5 rises to 1.2V, the voltage exceeds the turn-on voltage condition of the optocoupler U2. At this time, the light-emitting diode inside the optocoupler U2 emits light, and the photosensitive transistor corresponding to the optical path receives the light signal and is saturated and turned on. The output pin of the optocoupler is turned on to the ground level, pulling down the first pin of the bistable chip U1 to a low level. The low-level trigger signal provides a flip signal to the bistable chip U1. The fourth pin of the bistable chip U1 outputs a low level, and through the current-limiting resistor, that is, the fifth resistor R5, the base of the first transistor Q1 becomes a low level, so that the first transistor Q1 changes from a saturated conduction state to a cut-off state. After the first transistor Q1 is turned off, the load relay controlled on the collector of the first transistor, that is, the second relay K2, the fourth relay K4 and the self-locking relay, that is, the fifth relay K5, are all de-energized and disconnected. The load relay, i.e., the second relay K2 and the fourth relay K4, loses power and cuts off the power supply to the load. At the same time, the self-locking relay, i.e., the fifth relay K5, also loses power and cuts off the power supply to the switching power supply T1. Since the switching power supply T1 has no 220V power supply and no 5V voltage output, the bistable chip U1 is also powered off. At this point, it returns to the initial standby state and waits for the next user to press the power button S1 to trigger the startup.

[0085] The present invention has the following advantages:

[0086] 1. The present invention reduces the probability of damage caused by switching power supply failure by removing a small switching power supply with low reliability.

[0087] 2. The present invention eliminates the single-chip microcomputer or dedicated control chip working in the standby state, thereby avoiding input error logic caused by electromagnetic interference during the standby period, thereby preventing the occurrence of power equipment accidents. This improvement not only improves the anti-interference ability in complex electromagnetic environments, but also enhances the durability of the device, and significantly reduces power consumption in the standby state.

[0088] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A high-reliability power switch circuit, characterized in that: include: Step-down module, opening and closing module, indicator light module, switching power supply module, relay control drive module, shutdown and power-off module and power self-locking module; The step-down module is connected to the switch module and the indicator light module respectively, the switch module is also connected to the switch power module and the shutdown power module respectively, the switch power module is connected to the power self-locking module, the shutdown power module and the indicator light module respectively, the shutdown power module is connected to the relay control drive module, and the relay control drive module is connected to the power self-locking module; The step-down module includes: a first resistor, a third resistor, a fourth capacitor, a twelfth capacitor, a thirteenth capacitor, a third diode, and a rectifier bridge; after the first resistor is connected in parallel with the twelfth capacitor, one end is connected to the L end of the AC 220V voltage, and the other end is connected to the fourth end of the rectifier bridge; after the third resistor is connected in parallel with the thirteenth capacitor, one end is connected to the N end of the AC 220V voltage, and the other end is connected to the second end of the rectifier bridge; the third end of the rectifier bridge is grounded; the first end of the rectifier bridge is respectively connected to one end of the fourth capacitor and the negative electrode of the third diode; the other end of the fourth capacitor is grounded, and the positive electrode of the third diode is also grounded; the first end of the rectifier bridge is respectively connected to the switch module and the indicator light module; The relay control drive module includes: a second resistor, a fifth resistor, an eighth resistor, a sixteenth capacitor, a second relay, a fourth relay, a fourth diode, a second diode, a first transistor, and a third light-emitting diode; one end of the fifth resistor is connected to the shutdown and power-off module, the other end of the fifth resistor is respectively connected to one end of the eighth resistor, one end of the sixteenth capacitor and the base of the first transistor, the other end of the eighth resistor, the other end of the sixteenth capacitor and the emitter of the first transistor are all grounded, the collector of the first transistor is respectively connected to the cathode of the third light-emitting diode, one end of the second relay, the anode of the fourth diode, one end of the fourth relay and the anode of the second diode, the anode of the third light-emitting diode is connected to one end of the second resistor, the other end of the second relay, the cathode of the fourth diode, the other end of the fourth relay and the cathode of the second diode are all connected to a +5V voltage; The step-down module is used to convert the voltage from AC 220V to DC 12V. When the switch module receives the user's opening signal, the switch power supply module converts the voltage from AC 220V to DC 5V to supply the shutdown and power-off module, the indicator light module and the power self-locking module. The indicator light module indicates the power-on status, the shutdown and power-off module is turned on, the power self-locking module is turned on, and the relay control drive module supplies power to the load; When the opening and closing module receives a closing signal from the user, the shutdown and power-off module is closed, the power self-locking module is closed, the switch power module is closed, the indicator light module indicates the closing status, and the relay control drive module stops supplying power to the load.

2. The high-reliability power switch circuit according to claim 1, characterized in that: The opening and closing module comprises: A switch button, a fourth resistor, a fifth diode and a third relay; The output end of the step-down module is connected to one end of the switch button, and the other end of the switch button is respectively connected to one end of the fourth resistor, the cathode of the fifth diode and one end of the third relay, the anode of the fifth diode and the other end of the third relay are both grounded, and the other end of the fourth resistor is connected to the shutdown and power-off module.

3. The high-reliability power switch circuit according to claim 1, characterized in that: The indicator light module comprises: A first light emitting diode, a second light emitting diode, a sixth resistor, a seventh resistor, a first relay and an eighth diode; The output end of the step-down module is respectively connected to one end of the first light-emitting diode and one end of the second light-emitting diode, the other end of the first light-emitting diode is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to the first relay, the other end of the second light-emitting diode is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the first relay; One end of the first relay and the cathode of the eighth diode are connected to a +5V voltage, and the other end of the first relay and the anode of the eighth diode are both grounded.

4. The high-reliability power switch circuit according to claim 1, characterized in that: The switching power supply module comprises: The seventh capacitor and the switching power supply; The first end and the second end of the switching power supply are connected to the switch module; The fourth terminal of the switching power supply outputs a +5V voltage, one terminal of the seventh capacitor is connected to the +5V voltage, and the other terminal of the seventh capacitor and the third terminal of the switching power supply are both grounded.

5. The high-reliability power switch circuit according to claim 1, characterized in that: The power self-locking module comprises: a sixth diode and a fifth relay; The cathode of the sixth diode and one end of the fifth relay are both connected to a +5V voltage, and the anode of the sixth diode and the other end of the fifth relay are respectively connected to the relay control drive module.

6. The high-reliability power switch circuit according to claim 1, characterized in that: The shutdown and power-off module comprises: A fifth capacitor, a fifteenth capacitor, a bistable chip, and an optical coupler; One end of the fifth capacitor is respectively connected to the switch module and the first end of the optocoupler, the other end of the fifth capacitor and the second end of the optocoupler are both grounded, the third end of the optocoupler is grounded, the fourth end of the optocoupler is respectively connected to one end of the fifteenth capacitor and the first end of the bistable chip, the other end of the fifteenth capacitor is grounded, the second end and the third end of the bistable chip are both grounded, the sixth end of the bistable chip is used to connect to a +5V voltage, the fifth end of the bistable chip is suspended, and the fourth end is connected to the relay control drive module.

7. The high-reliability power switch circuit according to claim 6, characterized in that: The model of the bistable chip is: MAX16054.

8. The high-reliability power switch circuit according to claim 4, characterized in that: The model of the switching power supply is LD03-23B09R2.

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