CN215498915U - Bidirectional thyristor switching circuit, bidirectional thyristor control circuit and electronic equipment - Google Patents

Abstract

The embodiment of the application provides a bidirectional thyristor switch circuit, bidirectional thyristor control circuit and electronic equipment, bidirectional thyristor switch circuit includes: the bidirectional thyristor, the optical coupler, the charge-discharge circuit and the first capacitor are connected; the positive electrode of the charge-discharge circuit is connected with the first main terminal of the bidirectional controllable silicon and a live wire of an alternating current power supply; the negative pole of the charge-discharge circuit is connected with the gate pole of the bidirectional thyristor through two output ends of the optocoupler, and the negative pole of the charge-discharge circuit is connected with the zero line of the alternating current power supply through a first capacitor; a first main terminal of the bidirectional controllable silicon is connected with a live wire of an alternating current power supply, and a second main terminal of the bidirectional controllable silicon is connected with a zero line of the alternating current power supply through a load; two input ends of the optical coupler are trigger ends of the bidirectional silicon controlled switch circuit, and two input ends of the optical coupler are connected to the switch control loop. According to the embodiment of the application, a high-cost high-voltage bidirectional light-operated thyristor isolation driving chip is not needed, and the cost can be saved.

Description

Bidirectional thyristor switching circuit, bidirectional thyristor control circuit and electronic equipment

Technical Field

The embodiment of the application relates to the field of bidirectional thyristors, in particular to a bidirectional thyristor switching circuit, a bidirectional thyristor control circuit and electronic equipment.

Background

A triac, also known as a triac, is a power semiconductor device. The bidirectional thyristor can be conducted as long as a drive signal is applied to a gate pole of the bidirectional thyristor, and the bidirectional thyristor has no problem of reverse withstand voltage and has a simple control circuit, so that the bidirectional thyristor is widely applied to an alternating current circuit, and is generally used as a contactless switch and the like.

In an alternating current circuit, the drive of the bidirectional thyristor needs to share a live wire or a zero wire with alternating current, so the power supply and anti-interference problems of the bidirectional thyristor are very important. In some technologies, a special high-voltage bidirectional light-operated thyristor isolation driving chip is adopted to supply power to the bidirectional thyristor and realize anti-interference, but the high-voltage bidirectional light-operated thyristor isolation driving chip is complex to manufacture, so that no manufacturers can make the high-voltage bidirectional light-operated thyristor isolation driving chip on the market at present, the cost is very high, even the price of the thyristor is higher than the price of the thyristor, and the high-voltage bidirectional light-operated thyristor isolation driving chip is limited in application of many consumer electronic products.

SUMMERY OF THE UTILITY MODEL

To overcome the problems in the related art, the present application provides a triac switching circuit, a triac control circuit, and an electronic device, which have the advantage of cost saving.

According to a first aspect of embodiments of the present application, there is provided a triac switching circuit including: the bidirectional thyristor, the optical coupler, the charge-discharge circuit and the first capacitor are connected;

the positive electrode of the charge and discharge circuit is connected with the first main terminal of the bidirectional controllable silicon and a live wire of an alternating current power supply; the negative electrode of the charge-discharge circuit is connected with the gate pole of the bidirectional controllable silicon through two output ends of the optocoupler, and the negative electrode of the charge-discharge circuit is connected with the zero line of the alternating current power supply through the first capacitor; the first main terminal of the bidirectional controllable silicon is connected with a live wire of the alternating current power supply, and the second main terminal of the bidirectional controllable silicon is connected with a zero line of the alternating current power supply through a load; two input ends of the optical coupler are trigger ends of the bidirectional silicon controlled switch circuit, and the two input ends of the optical coupler are connected to the switch control loop.

According to a second aspect of the embodiments of the present application, there is provided a triac control circuit, including a step-down chopper circuit, a controller, and a triac switching circuit; the input end of the buck chopper circuit is connected with an alternating-current power supply, and the output end of the buck chopper circuit is connected to the switch control signal output end of the controller through the switch trigger end of the bidirectional thyristor switch circuit;

the triac switching circuit includes: the bidirectional thyristor, the optical coupler, the charge-discharge circuit and the first capacitor are connected;

the positive electrode of the charge and discharge circuit is connected with the first main terminal of the bidirectional controllable silicon and a live wire of an alternating current power supply; the negative electrode of the charge-discharge circuit is connected with the gate pole of the bidirectional controllable silicon through two output ends of the optocoupler, and the negative electrode of the charge-discharge circuit is connected with the zero line of the alternating current power supply through the first capacitor; the first main terminal of the bidirectional controllable silicon is connected with a live wire of the alternating current power supply, and the second main terminal of the bidirectional controllable silicon is connected with a zero line of the alternating current power supply through a load; two input ends of the optical coupler are trigger ends of the bidirectional silicon controlled switch circuit, and the two input ends of the optical coupler are connected to the switch control loop.

According to a third aspect of the embodiments of the present application, there is provided a step-down chopper circuit, a controller, a triac switching circuit, and an electronic apparatus main body; the input end of the buck chopper circuit is connected with an alternating-current power supply, and the output end of the buck chopper circuit is connected to the switch control signal output end of the controller through the switch trigger end of the bidirectional thyristor switch circuit; the bidirectional silicon controlled switch circuit is connected with an alternating current power supply loop of the electronic equipment main body;

the triac switching circuit includes: the bidirectional thyristor, the optical coupler, the charge-discharge circuit and the first capacitor are connected;

the positive electrode of the charge and discharge circuit is connected with the first main terminal of the bidirectional controllable silicon and a live wire of an alternating current power supply; the negative electrode of the charge-discharge circuit is connected with the gate pole of the bidirectional controllable silicon through two output ends of the optocoupler, and the negative electrode of the charge-discharge circuit is connected with the zero line of the alternating current power supply through the first capacitor; the first main terminal of the bidirectional controllable silicon is connected with a live wire of the alternating current power supply, and the second main terminal of the bidirectional controllable silicon is connected with a zero line of the alternating current power supply through a load; two input ends of the optical coupler are trigger ends of the bidirectional silicon controlled switch circuit, and the two input ends of the optical coupler are connected to the switch control loop.

According to the embodiment of the application, the bidirectional thyristor, the optocoupler, the charge-discharge circuit and the first capacitor are arranged, so that the isolated driving of the bidirectional thyristor is realized, the driving current is provided for the conduction of the bidirectional thyristor, a high-cost high-voltage bidirectional photothyristor isolated driving chip is not needed, and the cost can be saved; in addition, the isolation winding does not need to be additionally adopted, and the method can not be limited to products with the isolation winding and can be widely applied to most products; further, compare in the mode that adopts resistance to step down design drive current, this application embodiment adopts the capacitive reactance of first electric capacity to carry out the capacitive reactance step down at alternating current power supply's positive half cycle, and then releases energy at alternating current power supply's negative half cycle, can prevent that high voltage high current from causing the damage of resistance and circuit.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

For a better understanding and practice, the utility model is described in detail below with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a circuit diagram of a triac switching circuit according to an embodiment of the present application;

fig. 2 is a circuit diagram of a triac control circuit according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The word "if/if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination". Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Please refer to fig. 1, which is a circuit diagram of a triac switching circuit according to an embodiment of the present application. The bidirectional thyristor switch circuit is applied to alternating-current appliances such as refrigerators, air conditioners, range hoods, washing machines and the like, and is mainly used for controlling the on and off of the alternating-current appliances. Specifically, the bidirectional triode thyristor switching circuit of this application embodiment includes: the bidirectional triode thyristor TR1, the optocoupler PC1A, the charge-discharge circuit 10 and the first capacitor CX 1. The first capacitance CX1 is a non-polar thin film capacitor in the present embodiment.

The positive electrode of the charging and discharging circuit 10 is connected with a first main terminal T1 of the bidirectional triode thyristor TR1 and a live wire AC _ L of an alternating current power supply; the negative pole of the charge-discharge circuit 10 is connected with the gate G of the bidirectional thyristor TR1 through two output ends of the optocoupler PC1A, and the negative pole of the charge-discharge circuit 10 is connected with the zero line AC _ N of the alternating current power supply through a first capacitor CX 1; a first main terminal T1 of the bidirectional triode thyristor TR1 is connected with a live line AC _ L of an alternating current power supply, and a second main terminal T2 of the bidirectional triode thyristor TR1 is connected with a zero line AC _ N of the alternating current power supply through a load; two input ends of the optocoupler PC1A are trigger ends of the bidirectional thyristor switch circuit, and two input ends of the optocoupler PC1A are connected to the switch control loop to acquire a control signal of the bidirectional thyristor switch circuit. The ac power supply in the embodiment of the present application may be a commercial power, specifically, a 220V ac power supply.

When a switch trigger signal is received in a switch control loop, the optical coupler PC1A is conducted, a closed circuit is formed from the positive electrode of the charging and discharging circuit 10, the first main terminal T1 of the bidirectional controllable silicon TR1, the gate G of the bidirectional controllable silicon TR1 and two output ends of the optical coupler PC1A to the negative electrode of the charging and discharging circuit 10, so that a driving current is generated between the first main terminal T1 of the bidirectional controllable silicon TR1 and the gate G of the bidirectional controllable silicon TR1, the first main terminal T1 of the bidirectional controllable silicon TR1 and the second main terminal T2 of the bidirectional controllable silicon TR1 are conducted, a loop is formed from a live wire AC _ L of an alternating current power supply, the first main terminal T1 of the bidirectional controllable silicon TR1, the second main terminal T2 of the bidirectional controllable silicon TR1 and a load to a neutral wire AC _ N of the alternating current power supply, and the load is driven to work. A loop is formed from a live wire AC _ L of the alternating current power supply, the charging and discharging circuit 10 and the first capacitor CX1 to a zero wire AC _ N of the alternating current power supply in the positive half cycle of the alternating current power supply, the charging and discharging circuit 10 and the first capacitor CX1 are charged, and the capacitive reactance generated by the first capacitor CX1 under a certain alternating current signal frequency also provides a driving current for the bidirectional thyristor TR 1; the method specifically comprises the following steps: through carrying out the lectotype to the capacity of first electric capacity CX1, can make the capacitive reactance that first electric capacity CX1 produced step down the circuit and obtain corresponding electric current to after charging and discharging circuit 10, when charging and discharging circuit 10 discharges, the electric current that charging and discharging circuit 10 provided can satisfy the drive current that bidirectional thyristor TR1 switched on completely, and then triggers bidirectional thyristor TR1 and switches on. For example, the capacitive reactance Zc generated by the first capacitor CX1 is 1/2 × f × C, f is 50Hz, and C is the capacity of the first capacitor CX1, so that the current provided by the circuit is 220/Zc, and further, the driving current meeting the conduction of the triac TR1 can be obtained by selecting the first capacitor CX 1. In the negative half cycle of the AC power, a loop is formed from the live line AC _ N of the AC power, the first capacitor CX1, the charging and discharging circuit 10 to the AC power AC _ L, so that the first capacitor CX1 can discharge the stored energy back to the AC power.

According to the embodiment of the application, the bidirectional thyristor, the optocoupler, the charge-discharge circuit and the first capacitor are arranged, so that the isolated driving of the bidirectional thyristor is realized, the driving current is provided for the conduction of the bidirectional thyristor, a high-cost high-voltage bidirectional photothyristor isolated driving chip is not needed, and the cost can be saved; in addition, the isolation winding does not need to be additionally adopted, and the method can not be limited to products with the isolation winding and can be widely applied to most products; further, compare in the mode that adopts resistance to step down design drive current, this application embodiment adopts the capacitive reactance of first electric capacity to carry out the capacitive reactance step down at alternating current power supply's positive half cycle, and then releases energy at alternating current power supply's negative half cycle, can prevent that high voltage high current from causing the damage of resistance and circuit.

In one embodiment, the charging and discharging circuit 10 includes an energy storage capacitor E3 and a first diode D3; the anode of the energy storage capacitor E3 is connected with the first main terminal T1 of the bidirectional triode thyristor TR1 and the live wire AC _ L of the alternating current power supply, and the cathode of the energy storage capacitor E3 is connected with the anode of the first diode D3; the cathode of the first diode D3 is connected to the zero line AC _ N of the AC power source via the first capacitor CX1, that is, the anode of the energy storage capacitor E3 is the anode of the charging and discharging circuit 10, and the cathode of the first diode D3 is the cathode of the charging and discharging circuit 10. Through the cooperation of the low-voltage half-wave rectification filter of the energy storage capacitor E3 and the half-wave rectification of the first diode D3, when the alternating current power supply is in the positive half cycle, the circuit rectification filter formed among the alternating current power supply live wire AC _ L, the energy storage capacitor E3, the first diode D3, the first capacitor CX1 and the alternating current power supply zero line AC _ N is rectified.

In one embodiment, the charging and discharging circuit 10 further includes a voltage regulator ZD 1; the anode of the voltage-regulator tube ZD1 is connected with the cathode of a first diode D3; the cathode of the voltage-regulator tube ZD1 is connected with the anode of the energy-storage capacitor E3; the regulator tube clamps the two ends of the energy storage capacitor E3, and provides a discharge channel for the first capacitor CX1 when the alternating current power supply is in a negative half cycle, so that the energy storage capacitor E3, the first diode D3 and the first capacitor CX1 are matched, the alternating current is converted into the low-voltage direct current of a common zero line or a common live line, the isolation driving of the bidirectional thyristor TR1 is realized, and the driving current is provided for the conduction of the bidirectional thyristor TR 1.

In one embodiment, the positive input end of the optocoupler PC1A is connected with a power supply VCC; the negative input end of the optocoupler PC1A is a switch trigger signal receiving end; the collector of opto-coupler PC1A is connected with bidirectional thyristor TR 1's gate G, and the projecting pole of opto-coupler PC1A is connected with charge-discharge circuit 10's negative pole, and then when switch trigger signal was received at opto-coupler PC 1A's negative pole, opto-coupler PC1A switched on, and then triggered bidirectional thyristor TR1 and switched on.

Please refer to fig. 2, which is a circuit diagram of a triac control circuit according to an embodiment of the present application; the embodiment of the application also provides a bidirectional thyristor control circuit, which comprises a buck chopper circuit 20, a controller and a bidirectional thyristor switch circuit. The input end of the buck chopper circuit is connected with an alternating current power supply, and the output end of the buck chopper circuit is connected to the switch control signal output end of the controller through the trigger end of the bidirectional silicon controlled switch circuit. The circuit structure of the triac circuit is completely the same as that described above, and is not described herein.

In an embodiment, the controller may be any device that can implement the technical solution of the present application, for example, it may be implemented by a device such as a microcontroller MCU, and the like, and the specific type and model are not limited in the present application.

In one embodiment, the buck chopper circuit includes 20 a second diode D4, a switch K, an inductor L, a second capacitor E6, a third capacitor E5, and a third diode D5; the anode of the second diode D4 is connected with the live wire AC _ L of the alternating current power supply; the cathode of the second diode D4 is connected to the first connection terminal of the inductor L via the switch K, and the cathode of the second diode D4 is connected to the anode of the second capacitor E6; the negative electrode of the second capacitor E6 is connected with a zero line AC _ N of the alternating current power supply; the second connection end of the inductor L is connected with the anode of a third capacitor E5; the negative electrode of the third capacitor E5 is connected with a zero line AC _ N of an alternating current power supply; the anode of the third capacitor E5 is also connected with the switch control signal output end of the controller through two input ends of an optocoupler PC 1A; the anode of the third diode D5 is connected with a zero line AC _ N of an alternating current power supply; the cathode of the third diode D5 is connected to the first connection terminal of the inductor L. When the switch K is closed, a closed loop is formed from the live line AC _ LAC _ L of the alternating current power supply, the second diode D4, the switch K, the inductor L to the third capacitor E6, so that the inductor L and the third capacitor E5 are charged, and the stepped-down power supply voltage, such as 5V, is obtained at the positive terminal of the third capacitor E5; when the switch K is turned off, a closed loop is formed from the first connection end of the inductor L, the third capacitor E5, the third diode D5 and the second connection end of the inductor L, so that the inductor L continues to charge the third capacitor E5, and the stepped-down power supply voltage can be continuously obtained at the anode of the third capacitor E5; by controlling the on-off of the switch K, the average value of the output direct current voltage can be controlled, and the magnitude of the power supply voltage can be obtained at the anode of the third capacitor E5. Further, the controller is through outputting low voltage such as O at switch control signal output terminal, and then the positive pole input of opto-coupler PC1A is 5V and the negative pole input of opto-coupler PC1A is 0, and there is the pressure drop in both ends to make opto-coupler PCA1 switch on, and then further make the bidirectional thyristor switch on, thereby drive load work.

The embodiment of the application also provides electronic equipment, which comprises an electronic equipment main body and a bidirectional thyristor control circuit; the first main terminal T1 and the second main terminal T2 of the triac TR1 in the triac switching circuit are connected to an ac power supply circuit of the electronic apparatus main body. In the embodiment of the application, the electronic equipment can be various refrigerators, air conditioners, range hoods, washing machines and the like. For example, the electronic device may be a washing machine. The main structure of washing machine includes casing, drum and motor; the roller and the motor are both arranged in the machine shell, and the roller is connected with a torque output shaft of the motor. The first main terminal T1 and the second main terminal T2 of the triac TR1 are connected in the alternating current supply circuit of the motor. The triac control circuit is identical to that described above and will not be described in detail herein.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. A triac switching circuit, comprising: the bidirectional thyristor, the optical coupler, the charge-discharge circuit and the first capacitor are connected;

the positive electrode of the charge and discharge circuit is connected with the first main terminal of the bidirectional controllable silicon and a live wire of an alternating current power supply; the negative electrode of the charge-discharge circuit is connected with the gate pole of the bidirectional controllable silicon through two output ends of the optocoupler, and the negative electrode of the charge-discharge circuit is connected with the zero line of the alternating current power supply through the first capacitor; the first main terminal of the bidirectional controllable silicon is connected with a live wire of the alternating current power supply, and the second main terminal of the bidirectional controllable silicon is connected with a zero line of the alternating current power supply through a load; two input ends of the optical coupler are trigger ends of the bidirectional silicon controlled switch circuit, and the two input ends of the optical coupler are connected to the switch control loop.

2. The triac switching circuit of claim 1,

the charging and discharging circuit comprises an energy storage capacitor and a first diode; the anode of the energy storage capacitor is connected with the first main terminal of the bidirectional controllable silicon and the live wire of the alternating current power supply, and the cathode of the energy storage capacitor is connected with the anode of the first diode; and the cathode of the first diode is connected with the zero line of the alternating current power supply through the first capacitor.

3. The triac switching circuit of claim 2,

the charging and discharging circuit further comprises a voltage stabilizing tube; the anode of the voltage stabilizing tube is connected with the cathode of the first diode; and the cathode of the voltage-stabilizing tube is connected with the anode of the energy-storage capacitor.

4. A bidirectional silicon controlled rectifier control circuit is characterized by comprising a buck chopper circuit, a controller and a bidirectional silicon controlled rectifier switching circuit; the input end of the buck chopper circuit is connected with an alternating-current power supply, and the output end of the buck chopper circuit is connected to the switch control signal output end of the controller through the trigger end of the bidirectional thyristor switch circuit;

the triac switching circuit includes: the bidirectional thyristor, the optical coupler, the charge-discharge circuit and the first capacitor are connected;

the positive electrode of the charge and discharge circuit is connected with the first main terminal of the bidirectional controllable silicon and a live wire of an alternating current power supply; the negative electrode of the charge-discharge circuit is connected with the gate pole of the bidirectional controllable silicon through two output ends of the optocoupler, and the negative electrode of the charge-discharge circuit is connected with the zero line of the alternating current power supply through the first capacitor; the first main terminal of the bidirectional controllable silicon is connected with a live wire of the alternating current power supply, and the second main terminal of the bidirectional controllable silicon is connected with a zero line of the alternating current power supply through a load; two input ends of the optical coupler are trigger ends of the bidirectional silicon controlled switch circuit, and the two input ends of the optical coupler are connected to the switch control loop.

5. The triac control circuit of claim 4,

the charging and discharging circuit comprises an energy storage capacitor and a first diode; the anode of the energy storage capacitor is connected with the first main terminal of the bidirectional controllable silicon and the live wire of the alternating current power supply, and the cathode of the energy storage capacitor is connected with the anode of the first diode; and the cathode of the first diode is connected with the zero line of the alternating current power supply through the first capacitor.

6. The triac control circuit of claim 5,

the charging and discharging circuit further comprises a voltage stabilizing tube; the anode of the voltage stabilizing tube is connected with the cathode of the first diode; and the cathode of the voltage-stabilizing tube is connected with the anode of the energy-storage capacitor.

7. The triac control circuit of claim 5,

the buck chopper circuit comprises a second diode, a switch, an inductor, a second capacitor, a third capacitor and a third diode; the anode of the second diode is connected with the live wire of the alternating current power supply; the cathode of the second diode is connected with the first connecting end of the inductor through the switch, and the cathode of the second diode is connected with the anode of the second capacitor; the negative electrode of the second capacitor is connected with the zero line of the alternating current power supply; the second connecting end of the inductor is connected with the anode of the third capacitor; the negative electrode of the third capacitor is connected with a zero line of the alternating current power supply, and the positive electrode of the third capacitor is also connected with the switch control signal output end of the controller through two input ends of the optocoupler; the anode of the third diode is connected with a zero line of the alternating current power supply; and the cathode of the third diode is connected with the first connecting end of the inductor.

8. An electronic device, comprising: the voltage-reducing chopper circuit, the controller, the bidirectional silicon controlled switch circuit and the electronic equipment main body; the input end of the buck chopper circuit is connected with an alternating-current power supply, and the output end of the buck chopper circuit is connected to the switch control signal output end of the controller through the trigger end of the bidirectional thyristor switch circuit; the bidirectional silicon controlled switch circuit is connected with an alternating current power supply loop of the electronic equipment main body;

the triac switching circuit includes: the bidirectional thyristor, the optical coupler, the charge-discharge circuit and the first capacitor are connected;

the positive electrode of the charge and discharge circuit is connected with the first main terminal of the bidirectional controllable silicon and a live wire of an alternating current power supply; the negative electrode of the charge-discharge circuit is connected with the gate pole of the bidirectional controllable silicon through two output ends of the optocoupler, and the negative electrode of the charge-discharge circuit is connected with the zero line of the alternating current power supply through the first capacitor; the first main terminal of the bidirectional controllable silicon is connected with a live wire of the alternating current power supply, and the second main terminal of the bidirectional controllable silicon is connected with a zero line of the alternating current power supply through a load; two input ends of the optical coupler are trigger ends of the bidirectional silicon controlled switch circuit, and the two input ends of the optical coupler are connected to the switch control loop.

9. The electronic device of claim 8,

the charging and discharging circuit comprises an energy storage capacitor and a first diode; the anode of the energy storage capacitor is connected with the first main terminal of the bidirectional controllable silicon and the live wire of the alternating current power supply, and the cathode of the energy storage capacitor is connected with the anode of the first diode; and the cathode of the first diode is connected with the zero line of the alternating current power supply through the first capacitor.

10. The electronic device of claim 9,

the charging and discharging circuit further comprises a voltage stabilizing tube; the anode of the voltage stabilizing tube is connected with the cathode of the first diode; and the cathode of the voltage-stabilizing tube is connected with the anode of the energy-storage capacitor.

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