Matrix instruction control circuit based on photoelectric coupler

Abstract

The invention discloses a matrix instruction control circuit based on a photoelectric coupler, and the circuit comprises a signal processing circuit A which is used for achieving the anti-interference processing of pulse instruction signals, and the pulse instruction signals comprise an on instruction signal and an off instruction signal; the signal conversion circuit B is used for carrying out optoelectronic isolation on the opening instruction signal and the closing instruction signal after anti-interference processing; the signal comparison circuit C is used for outputting a corresponding control signal according to the opening instruction signal and the closing instruction signal after optoelectronic isolation; and the surge suppression circuit D is used for turning on or turning off the satellite-borne power supply assembly according to the control signal output by the signal comparison circuit C. An anti-interference circuit is designed to improve the anti-interference capability of the instruction control circuit, and an implementation mechanism of a traditional optocoupler control circuit is changed to eliminate an uncertain state when instruction signals act at the same time, so that the reliability of the instruction control circuit of the power supply assembly is improved.

Description

Technical Field

[0001] This invention relates to the field of control circuit technology, and in particular to a matrix command control circuit based on an optocoupler. Background Technology

[0002] Onboard power supply components are essential for maintaining the normal operation of satellite electronic systems such as computer systems, communication systems, integrated electronic systems, and telemetry and remote control systems. To control the power on and off of electronic equipment, command control circuits are typically integrated into the power supply components. To operate normally in the harsh space environment, the command control circuits of onboard power supply components must possess characteristics of electrical isolation, radiation resistance, and high reliability. Traditional control circuits using electromagnetic relays are prone to erroneous switching due to their engagement and disengagement actions, especially in harsh environments like space, making them unsuitable for long-term stable operation. Therefore, in space applications, command control circuits composed of radiation-resistant optocouplers are increasingly being used. Patent CN107070440B discloses an optocoupler-isolated pulse command power electronic switch circuit, mainly composed of an optocoupler circuit, an operational amplifier circuit, and a surge current suppression circuit. This circuit lacks anti-interference circuitry at the optocoupler input, making it prone to signal malfunctions. Furthermore, when power-on and power-off commands are input simultaneously, the output of the operational amplifier circuit becomes uncertain, directly leading to abnormal system operation and potentially causing serious accidents. Summary of the Invention

[0003] To address the shortcomings of the existing technology, the technical problem to be solved by this invention is to provide a matrix command control circuit based on an optocoupler. By designing anti-interference circuitry to enhance the anti-interference capability of the command control circuit, and by changing the implementation mechanism of the traditional optocoupler control circuit to eliminate the uncertain state when command signals act simultaneously, the reliability of the power supply component command control circuit is improved.

[0004] The technical solution adopted in this invention is: to provide a matrix command control circuit based on an optocoupler, comprising: Signal processing circuit A is connected to the switch command signal and includes an on command processing circuit and an off command processing circuit, which are used to process the switch command signal independently. Signal conversion circuit B includes an on command conversion circuit and an off command conversion circuit. The input terminals of the on command conversion circuit and the off command conversion circuit are respectively connected to the output terminals of the on command processing circuit and the off command processing circuit, and are used to perform photoelectric conversion and isolation on the switch command signal. The signal comparison circuit C includes a resistor voltage divider positive feedback loop and a comparator. The resistor voltage divider positive feedback loop is used to obtain the voltage division of the power supply voltage and form a positive feedback loop with the comparator. The comparator is used to compare the on or off command after photoelectric conversion isolation with the voltage magnitude of the voltage division. The surge suppression circuit D has its input terminal connected to the output terminal of the signal comparison circuit C, and is used to turn the on-board power supply component on or off according to the output of the signal comparison circuit C.

[0005] Furthermore, the on command processing circuit includes a diode D1, a Zener diode D3, a resistor R1, a resistor R2, and a capacitor C1. The anode of the diode D1 is connected to the on command signal, and the cathode is connected to the cathode of the Zener diode D3. The anode of the Zener diode D3 is connected to pin 1 of the resistors R1 and R2, pin 2 of the resistor R2 is connected to pin 1 of the capacitor C1, and pin 2 of the resistors R1 and C1 is connected to the command return line.

[0006] Furthermore, the shutdown command processing circuit includes a diode D2, a Zener diode D4, a resistor R3, a resistor R4, and a capacitor C2. The anode of the diode D2 is connected to the shutdown command signal, and the cathode is connected to the cathode of the Zener diode D4. The anode of the Zener diode D4 is connected to pin 1 of the resistors R3 and R4, pin 2 of the resistor R4 is connected to pin 1 of the capacitor C2, and pin 2 of the resistors R3 and C2 is connected to the command return line.

[0007] Furthermore, the on command conversion circuit includes an optocoupler IC1, pin 1 of which is connected to pin 2 of the resistor R2, and pin 2 of the optocoupler IC1 is connected to the command return line.

[0008] Furthermore, the command conversion circuit includes an optocoupler IC2, pin 1 of which is connected to pin 2 of the resistor R4, and pin 2 of which is connected to the command return line.

[0009] Furthermore, the comparator is a radiation-hardened comparator IC3, which includes five pins: pin 1 is the non-inverting input, connected to the voltage divider; pin 2 is the inverting input, connected to the on or off command after photoelectric conversion and isolation; pin 3 is the output terminal; pin 4 is the power supply terminal, connected to the power supply voltage VCC; and pin 5 is the ground terminal.

[0010] Furthermore, the resistor divider feedback loop includes an NPN transistor V1, a diode D5, resistors R5-R16, and capacitors C3-C6; the supply voltage VCC is connected to pin 1 of resistors R6, R8, R10, R13, and capacitor C5; pin 2 of resistor R6 is connected to pin 5 of optocoupler IC1 and pin 1 of resistor R7, and pin 2 of resistor R7 is grounded; pin 2 of resistor R8 and pin 1 of resistor R9, capacitor C3, and resistor R12 are connected to pin 1 of radiation-hardened comparator IC3; pin 2 of resistor R10, pin 4 of optocoupler IC1, pin 2 of resistor R5, and pin 1 of resistor R11 and capacitor C4 are connected to pin 2 of radiation-hardened comparator IC3; pin 2 of resistor R12 is connected to the anode of diode D5, and the cathode of diode D5 is connected to pin 3 of radiation-hardened comparator IC3, and this node is defined as V. O The V O The node connects pin 2 of resistor R13 and pin 1 of resistor R14; pin 1 of resistor R5 is connected to pin 5 of optocoupler IC2, and pin 4 of optocoupler IC2 is grounded; pin 2 of resistor R14 is connected to the base (b) of NPN transistor V1 and pin 1 of resistor R15 and capacitor C6; the collector (c) of NPN transistor V1 is connected to pin 1 of resistor R16, and the emitter (e) is grounded; pins 2 of resistors R9, R11, R15, capacitors C3, C4, C5, and C6 are grounded.

[0011] Furthermore, the surge suppression circuit D includes an NMOS transistor V2, a capacitor C7, and a resistor R18; the capacitor C7 is connected in parallel between the source and gate of the NMOS transistor V2, pin 1 of the capacitor C7 is connected to pin 2 of the resistor R16 and the positive output terminal of the surge suppression circuit D, and pin 2 of the capacitor C7 is grounded; pin 1 of the resistor R18 is connected to pin 1 of the capacitor C7, and pin 2 of the resistor R18 is connected to the gate of the NMOS transistor V2; the capacitor C7 and the resistor R18 constitute an RC delay drive circuit; the drain of the NMOS transistor V2 is connected to the negative output terminal of the surge suppression circuit D.

[0012] Furthermore, the surge suppression circuit D also includes a resistor R17, with pin 1 of the resistor R17 connected to the positive output terminal of the surge suppression circuit D, and pin 2 of the resistor R17 connected to pin 2 of the resistor R16, pin 1 of the resistor R18 and the capacitor C7.

[0013] Furthermore, the surge suppression circuit D also includes a Zener diode D6. The anode of the Zener diode D6 and pin 2 of the capacitor C7 are connected together to the source of the NMOS transistor V2 and grounded. The cathode of the Zener diode D6 is connected to pin 2 of the resistor R17.

[0014] The matrix command control circuit based on an optocoupler of the present invention has at least the following beneficial effects: The matrix command control circuit of the present invention can maintain the switching state of a pulse command signal; that is, only one pulse signal needs to be input for the device to maintain an on or off state, and the switching state maintenance effect disappears after the device is powered off. In contrast, control circuits based on electromagnetic relays will maintain the previous switching state after the device is powered off until the next pulse signal is input, which can easily lead to erroneous switching. The command control circuit of the present invention sets the electronic device to an off state before power-on, thereby eliminating erroneous switching when there is no command signal input. The present invention also incorporates an anti-interference circuit at the command signal input terminal to prevent malfunctions caused by command signals, improving the anti-interference capability of the command control circuit. Furthermore, when power-on and power-off signals are input simultaneously at the command input terminal, the circuit is always in a power-off state, rather than an uncertain state, improving the reliability of the command control circuit. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of a matrix instruction control circuit based on an optocoupler according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of a matrix instruction control circuit based on an optocoupler according to an embodiment of the present invention. Detailed Implementation

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Please see Figure 1 This is a schematic diagram of a matrix command control circuit based on an optocoupler according to an embodiment of the present invention. The matrix command control circuit based on an optocoupler includes a signal processing circuit A, a signal conversion circuit B, a signal comparison circuit C, and a surge suppression circuit D.

[0019] The signal processing circuit A is used to implement anti-interference processing of the pulse command signal, which includes an on command signal and an off command signal. The signal processing circuit A may include an on command processing circuit and an off command processing circuit, which are used to process the on command signal and the off command signal independently, respectively. This signal processing circuit A is used to rectify, protect, clamp, and filter the pulse switching signal to form anti-interference on and off command signals.

[0020] The input terminal of the signal conversion circuit B is electrically connected to the output terminal of the signal processing circuit A, and is used to perform opto-isolation on and off command signals after anti-interference processing. The signal conversion circuit B may include an on command conversion circuit and a off command conversion circuit, the input terminals of which are respectively connected to the output terminals of the on command processing circuit and the off command processing circuit, for opto-isolation of the on and off command signals. This signal conversion circuit B is mainly composed of optocouplers, thereby achieving opto-isolation of the on and off command signals.

[0021] The input terminal of the signal comparison circuit C is electrically connected to the output terminal of the signal conversion circuit B, and is used to output corresponding control signals to the surge suppression circuit D based on the opto-isolated on command signal and off command signal. The signal comparison circuit C may include a resistor voltage divider positive feedback loop and a comparator. The resistor voltage divider positive feedback loop is used to obtain the voltage division of the power supply voltage and form a positive feedback loop with the comparator. The comparator is used to compare the opto-isolated on command signal or off command signal with the voltage of the voltage division. This signal comparison circuit C mainly consists of a radiation-hardened comparator and peripheral circuitry of the comparator, which are connected in a positive feedback mode to maintain the state of the on and off command signals.

[0022] The input terminal of the surge suppression circuit D is electrically connected to the output terminal of the signal comparison circuit C, and is used to turn the on-board power supply component on or off according to the control signal output by the signal comparison circuit C. This surge suppression circuit D is generally composed of an NMOS transistor and is a key circuit for realizing surge suppression and switching of the on-board power supply component.

[0023] Please see Figure 2 This is a schematic diagram of a matrix command control circuit based on an optocoupler according to an embodiment of the present invention. The aforementioned on command processing circuit may specifically include a diode D1, a Zener diode D3, resistors R1 and R2, and a capacitor C1. The anode of diode D1 is connected to the on command signal, and its cathode is connected to the cathode of Zener diode D3. The anode of Zener diode D3 is connected to pin 1 of resistors R1 and R2, pin 2 of resistor R2 is connected to pin 1 of capacitor C1, and pin 2 of resistors R1 and C1 is connected to the command return line.

[0024] Similarly, the structure and connection method of the off instruction processing circuit are basically the same as those of the on instruction processing circuit. Specifically, it can include diode D2, Zener diode D4, resistor R3, resistor R4, and capacitor C2. The anode of diode D2 is connected to the off instruction signal, and the cathode is connected to the cathode of Zener diode D4. The anode of Zener diode D4 is connected to pin 1 of resistor R3 and resistor R4, pin 2 of resistor R4 is connected to pin 1 of capacitor C2, and pin 2 of resistor R3 and capacitor C2 is connected to the instruction return line.

[0025] The aforementioned on and off command processing circuits both rectify the original switching pulse signal using a diode, clamp the original switching pulse signal using a Zener diode, and filter the original switching pulse signal using an RC filter circuit composed of a resistor and a capacitor, thereby obtaining a clean and stable control command, which can greatly improve the anti-interference capability of the switching command signal.

[0026] In some embodiments, the on command conversion circuit may specifically include an optocoupler IC1, pin 1 of which is connected to pin 2 of the resistor R2, and pin 2 of the optocoupler IC1 is connected to the command return line.

[0027] Similarly, the structure and connection method of the off command conversion circuit are basically the same as those of the on command conversion circuit. Specifically, it may include an optocoupler IC2, pin 1 of which is connected to pin 2 of the resistor R4, and pin 2 of which is connected to the command return line.

[0028] The aforementioned on and off command conversion circuits both use optocouplers to achieve electrical isolation between the on and off command signals, ensuring that the on and off command signals can only be transmitted in one direction, thereby effectively preventing electrical interference.

[0029] In some embodiments, the comparator is a radiation-hardened comparator IC3, which includes five pins: pin 1 is the non-inverting input, connected to the voltage divider; pin 2 is the inverting input, connected to the opto-isolated on or off command signal; pin 3 is the output; pin 4 is the power supply, connected to the supply voltage VCC; and pin 5 is the ground.

[0030] The resistor-divider feedback loop includes an NPN transistor V1, a diode D5, resistors R5-R16, and capacitors C3-C6. The supply voltage VCC is connected to pin 1 of resistors R6, R8, R10, R13, and capacitor C5. Pin 2 of resistor R6 is connected to pin 5 of optocoupler IC1 and pin 1 of resistor R7, and pin 2 of resistor R7 is grounded. Pin 2 of resistor R8, and pin 1 of resistor R9, capacitor C3, and resistor R12 are connected to pin 1 of radiation-hardened comparator IC3, and this node can be defined as V... IN+ Pin 2 of resistor R10, pin 4 of optocoupler IC1, pin 2 of resistor R5, and pin 1 of resistor R11 and capacitor C4 are connected to pin 2 of radiation-hardened comparator IC3, and this node can be defined as V. IN- The resistor R12's pin 2 is connected to the anode of diode D5, and the diode D5's cathode is connected to pin 3 of the radiation comparator IC3. This node is defined as V. O The VO The node connects pin 2 of resistor R13 and pin 1 of resistor R14; pin 1 of resistor R5 is connected to pin 5 of optocoupler IC2, and pin 4 of optocoupler IC2 is grounded; pin 2 of resistor R14 is connected to the base (b) of NPN transistor V1 and pin 1 of resistor R15 and capacitor C6; the collector (c) of NPN transistor V1 is connected to pin 1 of resistor R16, and the emitter (e) is grounded; pins 2 of resistors R9, R11, R15, capacitors C3, C4, C5, and C6 are grounded. This resistor divider feedback loop and the comparator together form a signal comparison circuit C, used to compare the opto-isolated on or off command signal with the voltage magnitude of the divided voltage.

[0031] In some embodiments, the surge suppression circuit D may specifically include an NMOS transistor V2, a capacitor C7, and a resistor R18; the capacitor C7 is connected in parallel between the source and gate of the NMOS transistor V2, pin 1 of the capacitor C7 is connected to pin 2 of the resistor R16 and the positive output terminal of the surge suppression circuit D, and pin 2 of the capacitor C7 is grounded; pin 1 of the resistor R18 is connected to pin 1 of the capacitor C7, and pin 2 of the resistor R18 is connected to the gate of the NMOS transistor V2; the capacitor C7 and the resistor R18 constitute an RC delay drive circuit; the drain of the NMOS transistor V2 is connected to the negative output terminal of the surge suppression circuit D.

[0032] The surge suppression circuit D may further include a resistor R17, with pin 1 of the resistor R17 connected to the positive output terminal of the surge suppression circuit D, and pin 2 of the resistor R17 connected to pin 2 of the resistor R16, pin 1 of the resistor R18 and the capacitor C7.

[0033] The surge suppression circuit D may also include a Zener diode D6, the anode of which and pin 2 of the capacitor C7 are connected together to the source of the NMOS transistor V2 and grounded, and the cathode of which is connected to pin 2 of the resistor R17.

[0034] The principle of this invention for implementing command control of the onboard power supply components is as follows: 1. No on / off command signal input: Optocouplers IC1 and IC2 are not working, and the node voltage V of the radiation-hardened comparator IC3 is... IN+ The voltage drop across resistors R8 and R9 with respect to the supply voltage VCC is defined as V. IN+a V of the radiation-hardened comparator IC3 IN- The node voltage is the voltage drop across VCC caused by resistors R10 and R11, and is defined as V. IN-a At this time, V IN+a >V IN-a Comparator IC3 outputs a high level V. OhThe NPN transistor V1 is turned on, and the gate voltage V of the NMOS transistor V2 is... G The transistor V1 clamps the signal to a low level, the NMOS transistor V2 is cut off, and the onboard power supply component is turned off. 2. With the command signal input active and no other command signal input: Optocoupler IC1 operates, its optocoupler transistor conducts, optocoupler IC2 does not operate, and the node voltage V... IN+ Still V IN+a Node voltage V IN- The voltage drop across resistors R10, R11, and R6 is defined as V. IN-b At this time, V IN+a <V IN-b Comparator IC3 outputs a low level V Ol When transistor V1 is open, the gate voltage V G Normally, the NMOS transistor V2 is turned on; furthermore, after the turn-on command signal disappears, based on the positive feedback mechanism of comparator IC3, the node voltage V... IN+ Clamped low by resistor R12 and diode D5, the node voltage is defined as V. IN+b At this time, V IN+b <V IN-b NMOS transistor V2 remains on, and the onboard power supply components continue to operate. 3. No on / off command signal input: Optocoupler IC1 is not working, optocoupler IC2 is working, its optocoupler transistor is conducting, and the node voltage V IN+ The voltage drop across VCC caused by resistors R8 and R9 is V. IN+a Node voltage V IN- The voltage drop across R10, R11, and R5 is defined as V. IN-c At this time, V IN+a >V IN-c Comparator IC3 outputs a high level V. Oh The NPN transistor V1 is turned on, and the NMOS transistor V2 is turned off, thus shutting down the onboard power supply components; furthermore, after the shutdown command signal disappears, V... Oh >V IN+a The positive feedback effect of resistor R12 and diode D5 disappears, and the command control circuit returns to its initial state 1, V IN+a >V IN-a When NMOS transistor V2 is turned off, the onboard power supply component is shut down. 4. Simultaneous input of the on and off command signals: Both optocouplers IC1 and IC2 operate, and the node voltage V... IN+ For V IN+a Node voltage V IN- The voltage V is the voltage drop across resistors R10, R11, R6, and R5. IN-d At this time, V IN+a >VIN-d Comparator IC3 outputs a high level V. Oh The control transistor V1 is turned on, the NMOS transistor V2 is turned off, and the onboard power supply component is turned off.

[0035] In summary, when there are no on or off command signals input, the surge suppression circuit D is initially off; when an on command signal is input, the surge suppression circuit D is on, and even when the on command signal disappears, the surge suppression circuit D remains on; when an off command signal is input, the surge suppression circuit D is off, and even when the off command signal disappears, the circuit returns to its initial state, and the surge suppression circuit D is off; when both the on and off command signals are input simultaneously, the surge suppression circuit D is off.

[0036] As can be seen, the input terminal of the present invention is equipped with an anti-interference circuit, which improves the anti-interference capability of the command control circuit. In addition, the present invention solves the problem of uncertain output state of the circuit when the open command signal and the close command signal are input at the same time in the prior art, thereby improving the reliability of the command control circuit.

[0037] The above description merely illustrates preferred embodiments of the present invention and is quite specific and detailed; however, it should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this invention should be determined by the appended claims.

Claims

1. A matrix command control circuit based on an optocoupler, characterized in that, include: Signal processing circuit A is used to implement anti-interference processing of pulse command signals, which include on command signals and off command signals; Signal conversion circuit B is used to perform opto-isolation on the turn command signal and turn command signal after anti-interference processing, respectively. The signal comparison circuit C is used to output the corresponding control signal based on the opto-isolated on command signal and off command signal; as well as The surge suppression circuit D is used to turn the on-board power supply component on or off according to the control signal output by the signal comparison circuit C.

2. The matrix command control circuit based on an optocoupler as described in claim 1, characterized in that, The signal processing circuit A includes an on command processing circuit and an off command processing circuit. The on command processing circuit includes a diode D1, a Zener diode D3, a resistor R1, a resistor R2, and a capacitor C1. The anode of the diode D1 is connected to the on command signal, and the cathode is connected to the cathode of the Zener diode D3. The anode of the Zener diode D3 is connected to pin 1 of the resistors R1 and R2, pin 2 of the resistor R2 is connected to pin 1 of the capacitor C1, and pin 2 of the resistors R1 and C1 is connected to the command return line.

3. The matrix command control circuit based on an optocoupler as described in claim 2, characterized in that, The shutdown command processing circuit includes diode D2, Zener diode D4, resistor R3, resistor R4, and capacitor C2. The anode of diode D2 is connected to the shutdown command signal, and the cathode is connected to the cathode of Zener diode D4. The anode of Zener diode D4 is connected to pin 1 of resistors R3 and R4, pin 2 of resistor R4 is connected to pin 1 of capacitor C2, and pin 2 of resistors R3 and C2 is connected to the command return line.

4. The matrix command control circuit based on an optocoupler as described in claim 3, characterized in that, The signal conversion circuit B includes an on command conversion circuit and an off command conversion circuit. The input terminals of the on command conversion circuit and the off command conversion circuit are respectively connected to the output terminals of the on command processing circuit and the off command processing circuit. The on command conversion circuit includes an optocoupler IC1. Pin 1 of the optocoupler IC1 is connected to pin 2 of the resistor R2, and pin 2 of the optocoupler IC1 is connected to the command return line.

5. The matrix command control circuit based on an optocoupler as described in claim 4, characterized in that, The command conversion circuit includes an optocoupler IC2, pin 1 of which is connected to pin 2 of the resistor R4, and pin 2 of the optocoupler IC2 is connected to the command return line.

6. The matrix command control circuit based on an optocoupler as described in claim 5, characterized in that, The signal comparison circuit C includes a resistor voltage divider positive feedback loop and a comparator. The resistor voltage divider positive feedback loop is used to obtain the divided voltage of the power supply voltage and form a positive feedback loop with the comparator. The comparator is used to compare the opto-isolated on command signal or off command signal with the voltage of the divided voltage. The comparator is a radiation-hardened comparator IC3, which includes five pins: pin 1 is the non-inverting input, connected to the divided voltage; pin 2 is the inverting input, connected to the opto-isolated on command signal or off command signal; pin 3 is the output terminal; pin 4 is the power supply terminal, connected to the power supply voltage VCC; and pin 5 is the ground terminal.

7. The matrix command control circuit based on an optocoupler as described in claim 6, characterized in that, The resistor-divider feedback loop includes an NPN transistor V1, a diode D5, resistors R5-R16, and capacitors C3-C6. The supply voltage VCC is connected to pin 1 of resistors R6, R8, R10, R13, and capacitor C5. Pin 2 of resistor R6 is connected to pin 5 of optocoupler IC1 and pin 1 of resistor R7, and pin 2 of resistor R7 is grounded. Pin 2 of resistor R8, and pin 1 of resistor R9, capacitor C3, and resistor R12 are connected to pin 1 of radiation-hardened comparator IC3. Pin 2 of resistor R10, pin 4 of optocoupler IC1, pin 2 of resistor R5, and pin 1 of resistor R11 and capacitor C4 are connected to pin 2 of radiation-hardened comparator IC3. Pin 2 of resistor R12 is connected to the anode of diode D5. The cathode of diode D5 is connected to pin 3 of radiation-hardened comparator IC3, and this node is defined as V. O The V O The node connects pin 2 of resistor R13 and pin 1 of resistor R14; Pin 1 of resistor R5 is connected to pin 5 of optocoupler IC2, and pin 4 of optocoupler IC2 is grounded; pin 2 of resistor R14 is connected to the base (b) of NPN transistor V1 and pin 1 of resistor R15 and capacitor C6; the collector (c) of NPN transistor V1 is connected to pin 1 of resistor R16, and the emitter (e) is grounded; pin 2 of resistors R9, R11, R15, capacitors C3, C4, C5, and C6 are grounded.

8. The matrix command control circuit based on an optocoupler as described in claim 7, characterized in that, The surge suppression circuit D includes an NMOS transistor V2, a capacitor C7, and a resistor R18. The capacitor C7 is connected in parallel between the source and gate of the NMOS transistor V2. Pin 1 of the capacitor C7 is connected to pin 2 of the resistor R16 and the positive output terminal of the surge suppression circuit D, and pin 2 of the capacitor C7 is grounded. Pin 1 of the resistor R18 is connected to pin 1 of the capacitor C7, and pin 2 of the resistor R18 is connected to the gate of the NMOS transistor V2. The capacitor C7 and the resistor R18 form an RC delay drive circuit. The drain of the NMOS transistor V2 is connected to the negative output terminal of the surge suppression circuit D.

9. The matrix command control circuit based on an optocoupler as described in claim 8, characterized in that, The surge suppression circuit D also includes a resistor R17. One pin of the resistor R17 is connected to the positive output terminal of the surge suppression circuit D, and the other pin of the resistor R17 is connected to the second pin of the resistor R16, the first pin of the resistor R18, and the first pin of the capacitor C7.

10. The matrix command control circuit based on an optocoupler as described in claim 9, characterized in that, The surge suppression circuit D also includes a Zener diode D6. The anode of the Zener diode D6 and pin 2 of the capacitor C7 are connected together to the source of the NMOS transistor V2 and grounded. The cathode of the Zener diode D6 is connected to pin 2 of the resistor R17.

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