Silicon controlled rectifier drive circuit without high-voltage bidirectional optocoupler control
By eliminating the need for a high-voltage bidirectional optocoupler-controlled thyristor drive circuit, and utilizing a combination of connectors, thyristors, resistors, capacitors, transistors, and microcontroller system modules, the complexity and high cost of the high-voltage bidirectional optocoupler-controlled thyristor drive circuit are solved, achieving low-cost, high-performance thyristor driving and anti-interference effects.
Patent Information
- Application Number
- CN202510946909.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2025-11-07
AI Technical Summary
In the existing technology, the high-voltage bidirectional optocoupler control of the thyristor drive circuit is complex to manufacture and has a high cost, which limits its application in consumer electronics products.
The high-voltage bidirectional optocoupler control circuit for the thyristor is eliminated. Instead, the thyristor is driven and anti-interference is achieved through a combination of connectors, thyristors, resistors, capacitors, transistors, diodes, and a microcontroller system module, thus omitting the high-voltage bidirectional optocoupler.
It achieves no drive when the load is stopped, the thyristor works after the button is pressed, and does not work when the button is stopped. It reduces costs without reducing performance, does not increase static power consumption, and has the same anti-interference capability as the high-voltage bidirectional optocoupler.
Smart Images
Figure CN120915282A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of silicon controlled rectifier driving circuit, and particularly relates to a high-voltage bidirectional optocoupler-free silicon controlled rectifier driving circuit. BACKGROUND
[0002] Bidirectional silicon controlled rectifier, also known as bidirectional thyristor, is a kind of power semiconductor device. The bidirectional silicon controlled rectifier can be turned on as long as a driving signal is applied to its gate, and the bidirectional silicon controlled rectifier has no reverse voltage problem, and the control circuit is simple. Therefore, the bidirectional silicon controlled rectifier is widely used in alternating current circuits, and is usually used as a non-contact switch.
[0003] For general silicon controlled rectifier driving circuit, in an alternating current circuit, the driving of the bidirectional silicon controlled rectifier needs to share the live wire or the zero line with the alternating current. Therefore, the power supply and anti-interference of the bidirectional silicon controlled rectifier are very important. In some technologies, a special high-voltage bidirectional optocoupler isolation driving chip is used to supply power to the bidirectional silicon controlled rectifier and realize anti-interference. However, the high-voltage bidirectional optocoupler isolation driving chip is complex to manufacture, and there are only a few manufacturers on the market, and the cost is very high, even higher than the price of the silicon controlled rectifier itself, which is limited in many consumer electronic product applications.
[0004] In order to solve the above technical problems, the present application provides a high-voltage bidirectional optocoupler-free silicon controlled rectifier driving circuit. SUMMARY
[0005] The present application aims to provide a high-voltage bidirectional optocoupler-free silicon controlled rectifier driving circuit to solve the problems in the prior art.
[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a high-voltage bidirectional optocoupler-free silicon controlled rectifier driving circuit, comprising a connector CN3 and a silicon controlled rectifier TR4, the connector CN3 is connected with the silicon controlled rectifier TR4, one end of a resistor R54 is connected with a pin 3 of the silicon controlled rectifier TR4, the other end of the resistor R54 is connected with one end of a capacitor CX1, the other end of the capacitor CX1 is connected with a base of a transistor Q9, a collector of the transistor Q9 is connected with a resistor R44 and an anode of a diode D20, an emitter of the transistor Q9 is connected with ground, the other end of the resistor R44 is connected with an anode of a diode D4, one end of a resistor R43 is connected with a cathode of the diode D20, and the other end of the resistor R43 is connected with ground.
[0007] Preferably, the cathode of the diode D4 is connected with a load "FZL Heat C".
[0008] Preferably, the high-voltage bidirectional optocoupler-free silicon controlled rectifier driving circuit further comprises a power module, the power module comprises an input part, a voltage transformation and rectification part, and a power transformation and voltage stabilization part.
[0009] Preferably, the input part includes CN2 interface, F2 fuse, RV1 voltage-dependent resistor, RT1 thermistor, C3 capacitor, CY3 capacitor; one end of the F2 fuse is connected to the "AC_L" pin, the two ends of the RV1 voltage-dependent resistor are respectively connected across "AC_N" and "AC_L", the RT1 thermistor is connected in series in the "AC_L" line, the two ends of the C3 capacitor are respectively connected between "AC_N" and "AC_L", and the RX2 capacitor, RX3 capacitor and RX1 capacitor cooperate with the C3 capacitor to filter and suppress EMI.
[0010] Preferably, the transformer and rectifier part includes transformer secondary winding, filter capacitor CY1, filter capacitor CY2, filter capacitor C4, inductor L1 and rectifier bridge BD1; the two ends of the transformer secondary winding are respectively connected to one end of the two windings of the common mode inductor L1, the transformer secondary winding is simultaneously connected in parallel to the ground through the filter capacitor CY1 and the filter capacitor CY2, and the transformer secondary winding is also connected to the two ends of the filter capacitor C4; the other ends of the two windings of the common mode inductor L1 are respectively connected to the AC input end of the rectifier bridge BD1; the filter capacitor CY1 and the filter capacitor CY2 are respectively connected across the two ends of the transformer secondary winding and the ground; and the AC input end of the rectifier bridge BD1 is connected to the output of the inductor L1.
[0011] Preferably, the power conversion and voltage stabilization part includes U1 chip, RX4 resistor, RX5 resistor, RX6 resistor, RX7 resistor, C2 capacitor, L2 inductor, D3 diode, EC3 capacitor, R11 resistor, RS1 resistor, RS2 resistor, R7 resistor, C03 capacitor and D8 diode.
[0012] Preferably, the single-chip microcomputer system module includes MCU, capacitor C1, resistor R1, capacitor C5, capacitor CE1 and pull-up resistor R3.
[0013] Compared with the prior art, the power supply is in an initial state without a trigger signal, the bidirectional thyristor is not driven, and the load is in a stop state and does not work. After the key is operated, the chip receives a running instruction, drives the triode to be turned on, and then triggers the thyristor to work, so that the load works. After the key is operated, the chip receives a stop instruction, drives the triode to be turned off, and triggers the thyristor to not work, so that the load stops working. The high-voltage bidirectional photoelectric coupler is omitted, and the cost is reduced. The performance is the same as that of the high-voltage bidirectional photoelectric coupler, and the power of the load is not reduced. The static power consumption of the circuit is not additionally increased. BRIEF DESCRIPTION OF DRAWINGS
[0014] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, illustrate the application together with the embodiments thereof, and explain the application without limiting the application. In the drawings:
[0015] Fig. 1 is a circuit diagram of the present application;
[0016] Fig. 2 is a circuit diagram of the power module of the present application;
[0017] Fig. 3 is a circuit diagram of the single-chip microcomputer module of the present application. DETAILED DESCRIPTION
[0018] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.
[0019] Please refer to Figs. 1-3 In the embodiment of the present application, a high-voltage bidirectional optocoupler control thyristor driving circuit is omitted, which comprises a connector CN3 and a thyristor TR4. The connector CN3 is connected with the thyristor TR4. One end of the pin 3 of the thyristor TR4 is connected with one end of a resistor R54. The other end of the resistor R54 is connected with one end of a capacitor CX1. The other end of the capacitor CX1 is connected with the base of a transistor Q9. The collector of the transistor Q9 is connected with a resistor R44 and the anode of a diode D20. The emitter of the transistor Q9 is connected with the ground. The other end of the resistor R44 is connected with the anode of the diode D4. One end of a resistor R43 connected with the cathode of the diode D20 is connected with the ground. The cathode of the diode D4 is connected with a load "FZL Heat C".
[0020] The power module further comprises an input part, a voltage transformation and rectification part, a power transformation and voltage stabilization part.
[0021] The input part comprises a CN2 interface, a F2 fuse, a RV1 voltage-dependent resistor, a RT1 thermistor, a C3 capacitor and a CY3 capacitor. One end of the F2 fuse is connected with an "AC_L" pin. The voltage-dependent resistor is connected between "AC_N" and "AC_L" respectively. The thermistor is connected in series in the "AC_L" circuit. The C3 capacitor is connected between "AC_N" and "AC_L" respectively. The RX2 capacitor, the RX3 capacitor and the RX1 capacitor cooperate with the C3 capacitor to filter and suppress EMI.
[0022] The voltage conversion and rectification part includes transformer secondary winding, filter capacitor CY1, filter capacitor CY2, filter capacitor C4, inductor L1, rectifier bridge BD1; the two ends of the transformer secondary winding are respectively connected to one end of the two windings of the common mode inductor L1, the transformer secondary winding is connected to the ground through the filter capacitor CY1 and the filter capacitor CY2 in parallel, and the transformer secondary winding is connected to the two ends of the filter capacitor C4; the other ends of the two windings of the common mode inductor L1 are respectively connected to the AC input end of the rectifier bridge BD1; the filter capacitor CY1 and the filter capacitor CY2 are respectively connected between the two ends of the transformer secondary winding and the ground; and the AC input end of the rectifier bridge BD1 is connected to the inductor L1 output. The rectifier bridge BD1 is composed of four diodes to form a bridge rectifier circuit. The AC voltage output by the transformer secondary winding is converted into DC voltage by using the unidirectional conductivity of the diodes. In the positive half cycle of the AC voltage, two diodes are turned on, and in the negative half cycle, the other two diodes are turned on, so that full-wave rectification is realized, and a DC voltage is output.
[0023] The power conversion and voltage stabilization part includes U1 chip, RX4 resistor, RX5 resistor, RX6 resistor, RX7 resistor, C2 capacitor, L2 inductor, D3 diode, EC3 capacitor, R11 resistor, RS1 resistor, RS2 resistor, R7 resistor, C03 capacitor and D8 diode.
[0024] It also includes a single-chip microcomputer system module, which includes an MCU, a capacitor C1, a resistor R1, a capacitor C5, a capacitor CE1, and a pull-up resistor R3. The capacitor C1 and the resistor R1 form a power-on reset circuit. At the moment of power-on, the capacitor C1 is charged, and the R1 makes the reset pin temporarily maintain a low level, realizing power-on reset. In addition, manual reset can also be realized by triggering a low-level signal externally. The capacitor C5 and the capacitor CE1 near the power supply pin (VDD) are used for power supply filtering to remove high-frequency noise in the power supply and provide a stable and pure power supply for the single-chip microcomputer. The pull-up resistor R3 is connected between the power supply and the corresponding pin, making the pin high in the default state.
[0025] 1. The load is connected to the 2nd and 4th pins of the socket CN3.
[0026] 2. After power-on, the supply voltage of the chip is obtained through the non-isolated power supply module.
[0027] 3. After the MCU obtains the running instruction, the FZL_Heat_C outputs a high level, which is added to the base of Q9 through D4 and R44. Then it is divided into two time periods:
[0028] 1) During the positive half cycle of the mains, the base of Q9 is electrified and turned on, and AC_LOUT passes through the T1 and gate of TR4, R54, CX1, Q9, ground, rectifier bridge BD1, and AC_NOUT loop, triggering the silicon-controlled rectifier to be turned on. The load is also electrified.
[0029] 2) When the half cycle of the mains is negative, AC_NOUT passes through the rectifier bridge BD1, ground, D20, Q9, the gate of CX1, R54, TR4 and the loop of T1, AC_LOUT, and triggers the thyristor to conduct. The load is powered as well.
[0030] 3) Thus the load is powered for a complete cycle.
[0031] 4) When the MCU receives a stop command, FZL_Heat_C outputs a low level, which is added to the base of Q9 through D4, R44. The base has no voltage and Q9 is cut off. TR4 has no maintaining trigger current and TR4 is not conducting. The load is not powered and stops working.
[0032] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will still be able to make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A high-voltage bidirectional opto-coupler control thyristor drive circuit, characterized by: The connector CN3 is connected with the thyristor TR4, the pin 3 of the thyristor TR4 is connected with one end of the resistance R54, the other end of the resistance R54 is connected with one end of the capacitor CX1, the other end of the capacitor CX1 is connected with the base of the transistor Q9, the collector of the transistor Q9 is connected with the resistance R44 and the anode of the diode D20, the emitter of the transistor Q9 is connected with the ground, the other end of the resistance R44 is connected with the anode of the diode D4, the cathode of the diode D20 is connected with one end of the resistance R43, the other end of the resistance R43 is connected with the ground.
2. The high-voltage bidirectional opto-coupler controlled silicon controlled rectifier driving circuit according to claim 1, wherein: The cathode of the diode D4 is connected with the load "FZL Heat C".
3. The high-voltage bidirectional opto-coupler controlled silicon controlled rectifier driving circuit according to claim 1, wherein: The power supply module includes an input part, a voltage transformation and rectification part, a power transformation and voltage stabilization part.
4. The high-voltage bidirectional opto-coupler controlled silicon controlled rectifier driving circuit according to claim 3, wherein: The input part includes a CN2 interface, a F2 fuse, an RV1 voltage-dependent resistor, an RT1 thermistor, a C3 capacitor, a CY3 capacitor; one end of the F2 fuse is connected with the "AC_L" pin, the voltage-dependent resistor is connected between "AC_N" and "AC_L" respectively, the thermistor is connected in series in the "AC_L" line, the C3 capacitor is connected between "AC_N" and "AC_L" respectively, the RX2 capacitor, the RX3 capacitor, the RX1 capacitor and the C3 capacitor cooperate to filter and suppress EMI.
5. The high-voltage bidirectional opto-coupler controlled thyristor drive circuit according to claim 3, characterized in that: The voltage transformation and rectification part includes a transformer secondary winding, a filter capacitor CY1, a filter capacitor CY2, a filter capacitor C4, an inductor L1 and a rectifier bridge BD1; the two ends of the transformer secondary winding are respectively connected with one end of the two windings of the common mode inductor L1, the transformer secondary winding is connected with the filter capacitor CY1 and the filter capacitor CY2 to the ground in parallel respectively, and the transformer secondary winding is connected with the two ends of the filter capacitor C4; the other ends of the two windings of the common mode inductor L1 are respectively connected to the AC input end of the rectifier bridge BD1; the filter capacitor CY1 and the filter capacitor CY2 are connected between the two ends of the transformer secondary winding and the ground respectively; the AC input end of the rectifier bridge BD1 is connected with the inductor L1 output.
6. The high-voltage bidirectional opto-coupler controlled silicon controlled rectifier driving circuit according to claim 3, wherein: The power transformation and voltage stabilization part includes a U1 chip, a RX4 resistor, a RX5 resistor, a RX6 resistor, a RX7 resistor, a C2 capacitor, a L2 inductor, a D3 diode, an EC3 capacitor, an R11 resistor, an RS1 resistor, an RS2 resistor, an R7 resistor, a C03 capacitor and a D8 diode.
7. The high-voltage bidirectional opto-coupler controlled silicon controlled rectifier driving circuit according to claim 1, wherein: The single-chip microcomputer system module includes an MCU, a capacitor C1, a resistor R1, a capacitor C5, a capacitor CE1 and a pull-up resistor R3.