General gasoline engine power supply circuit with monitoring function

Abstract

The utility model discloses a general gasoline engine power supply circuit with a monitoring function and a power supply method, relates to the technical field of generator control, and can dynamically distribute external power supply according to the working condition of a generator, reduce the operation load of the power supply circuit and improve the stability and reliability of external output of the power supply circuit. The engine is used for providing kinetic energy for the generator; the generator is used for converting the kinetic energy provided by the engine into alternating current electric energy; the voltage regulation conversion sub-circuit comprises a voltage regulation conversion circuit and is used for reducing the voltage of the alternating current generated by the generator and converting the alternating current into direct current to be output; the acquisition unit is used for acquiring operation data of the engine and the generator and comprises a rotating speed sensor, and the rotating speed sensor is used for acquiring rotating speed data of the engine or the generator; and the control unit comprises an MCU (Microprogrammed Control Unit) and a control circuit, and the control unit is used for distributing and controlling the electric energy output of the generator through the control circuit according to the rotating speed data.

Description

Technical Field

[0001] The utility model relates to the technical field of generator control, in particular to a general power supply circuit with a monitoring function and a power supply method. Background Art

[0002] Generators have a wide range of applications in industrial and agricultural production, national defense, science and technology, and everyday life. Generators come in many forms, but their operating principles are all based on the laws of electromagnetic induction and electromagnetic force. Therefore, the general principle of their construction is to use appropriate magnetic and conductive materials to form magnetic and electrical circuits that induce electromagnetic induction, thereby generating electromagnetic power and achieving energy conversion.

[0003] In addition to using an inverter circuit to convert chemical energy through combustion into mechanical energy and then into 110VAC and 220VAC AC power, the generator is usually also equipped with a module that can convert low-voltage DC, called a DC voltage regulator. This module converts the AC power provided by the generator charging coil into a DC voltage source through voltage regulation circuits such as step-down and voltage stabilization. The DC output is then used to charge the starting battery outside the generator, supply oil to the solenoid valve of the carburetor, the generator instrument panel, and other generator peripheral modules.

[0004] Typically, a generator's DC voltage regulator is constructed using analog circuit components such as thyristors, Zener diodes, and triodes. While this type of regulator offers advantages such as a simple circuit structure and low cost, it suffers from low output power, a single function, and limited load capacity, typically within 100W. Furthermore, the DC voltage it outputs contains industrial frequency AC components, effectively limiting its use to a single charging module. Utility Model Content

[0005] 1. Technical Problems Solved

[0006] In response to the deficiencies of the prior art, the utility model proposes a general-purpose power supply circuit with a monitoring function, which can dynamically distribute external power supply according to the working conditions of the generator, reduce the operating load of the power supply circuit, and improve the stability and reliability of the power supply circuit's external output.

[0007] 2. Specific technical solutions

[0008] A general-purpose power supply circuit with a monitoring function comprises an engine, a generator, and electrical appliances powered by the generator, wherein the electrical appliances include a battery for the generator, an oil supply solenoid valve for the engine, an igniter for the engine, and an instrument control panel. The circuit also includes a voltage regulation conversion unit, the input end of which is connected to the output end of the engine via a voltage regulation conversion subcircuit, for reducing the voltage of the alternating current produced by the generator and converting it into a direct current output; an electrical appliance power supply subcircuit, the input end of which is connected to the output end of the voltage regulation conversion unit; an acquisition unit, comprising a speed sensor, the data acquisition end of which is connected to the engine or generator; and a control unit, the control unit comprising an MCU and a control subcircuit, the MCU being connected to the signal output end of the speed sensor and further connected to the electrical appliance power supply subcircuit via the control subcircuit.

[0009] Implementation principle and working principle:

[0010] The principle behind this solution is that, through the provision of a data acquisition unit, it is possible to collect operating data from the engine and generator. The control unit processes the collected operating data and, through a control circuit, distributes the generator's voltage output to different electrical consumers. This allows for dynamic allocation of external power supply based on the generator's operating conditions. When the speed sensor detects that the generator is at low speed or idling, power is preferentially distributed to critical components, such as the fuel supply solenoid valve and ignition device, which are involved in generator power and starting. Once the generator is running at full speed, power is then supplied to electrical consumers, such as the battery and instruments. This dynamic distribution of generator power reduces the operating load of the charging module and improves the stability and reliability of the charging module's external power output.

[0011] Preferably, the MCU is a single chip microcomputer, and the acquisition unit further comprises an oil alarm for monitoring the amount of engine oil and a CO alarm for monitoring the carbon monoxide in the engine.

[0012] Preferably, the electrical appliance power supply sub-circuit further comprises a first drive sub-circuit, wherein the first output terminal of the voltage regulation and conversion sub-circuit is connected to the input terminal of the first drive sub-circuit, wherein the positive electrode of the first output terminal is connected to the positive electrode of the diode D24, the first branch of the cathode of the diode D24 is connected to the D electrode of the MOS transistor Q8, and the S electrode of the MOS transistor Q8 is one end of the output terminal of the first drive sub-circuit; the second branch of the cathode of the diode D24 is connected to the resistor R75, the first branch of the other end of the resistor R75 is connected to the G electrode of the MOS transistor Q8, the second branch of the other end of the resistor R75 is connected to the D electrode of the MOS transistor Q9, and the third branch of the other end of the resistor R75 is connected to the resistor R76; the other end of the resistor R76 is connected to the negative electrode of the first output terminal and then to ground; the G electrode of the MOS transistor Q9 is connected to the negative electrode of the first output terminal through the resistor R77 and then to ground; the S electrode of the MOS transistor Q9 is grounded, and the S electrode of the MOS transistor Q9 is the other end of the output terminal of the first drive sub-circuit of the solenoid valve.

[0013] Preferably, the battery and the fuel supply solenoid valve are electrically connected, and the battery supplies power to the fuel supply battery valve through the second drive subcircuit of the electrical appliance power supply electronic circuit. The positive electrode of the diode D25 of the second drive subcircuit is connected to the positive electrode of the battery, and the first branch of the cathode of the diode D25 is connected to the D electrode of the MOS tube Q15. The S electrode of the MOS tube Q15 is connected between the cathode of the diode D24 and the resistor R75; the second branch of the cathode of the diode D25 is connected to the negative electrode of the battery through the resistors R89 and R88, and the third branch connected to the cathode of the diode D25 is connected to the transistor end of the photoelectric coupler U18. The other end of the transistor of the photoelectric coupler U18 is connected between the resistors R89 and R88 and then to the G electrode of the MOS tube Q15; the positive electrode of the light-emitting diode of the photoelectric coupler U18 is connected to the negative electrode of the battery through the resistor R87, and the negative electrode of the light-emitting diode of the photoelectric coupler U18 is connected to the negative electrode of the power supply through the resistor R119.

[0014] Preferably, the control unit includes a first output terminal PD3 and a second output terminal P4, the first output terminal PD3 is connected to the G terminal of the MOS tube Q9, and the second output terminal PD4 is connected to the positive electrode of the light emitting diode of the photoelectric coupler.

[0015] Preferably, the speed sensor is connected to the control unit through a speed acquisition subcircuit, the signal output end of the speed sensor is connected to the positive electrode of the diode D21, the first branch of the negative electrode of the diode D21 is connected to a resistor R85, the other end of the resistor R85 is connected to the positive electrode of the light-emitting diode of the photoelectric coupler U8, the negative electrode of the light-emitting diode of the photoelectric coupler U8 is connected to a resistor R83, the other end of the resistor R83 is connected to the positive electrode of the diode D26, and the negative electrode of the diode D26 is grounded; the second branch of the negative electrode of the diode D21 is connected to a capacitor C40, the other end of the capacitor C40 is connected between the photoelectric coupler U8 and the resistor R83; one end of the transistor of the photoelectric coupler U8 is connected to the power supply, and the other end of the transistor of the photoelectric coupler U8 is connected to the input end PC4 of the control unit through a filtering circuit.

[0016] Preferably, the signal output terminal PC3 of the control unit is connected to a resistor R106, the other end of the resistor R106 is connected to the anode of the diode of the photoelectric coupler U17, and the cathode of the diode of the photoelectric coupler U17 is grounded; the transistor part of the photoelectric coupler U17 is located in the flameout sub-circuit, the first branch connected to the positive pole of the flameout sub-circuit is connected to the resistor R1, the first branch at the other end of the resistor R1 is connected to the B pole of the transistor Q19, the C pole of the transistor Q19 is connected to the second branch at the positive pole of the flameout circuit, the second branch at the other end of the resistor R1 is connected to the first end of the transistor of the photoelectric coupler U17, the first branch of the E pole of the transistor Q17 is connected to the positive pole of the capacitor C50, the other end of the capacitor C50 is grounded, the second branch of the E pole of the transistor Q17 is connected to the resistor R108 and then grounded; the second branch at the other end of the resistor R1 is connected to one end of the transistor of the photoelectric coupler U17, and the other end of the transistor of the photoelectric coupler U17 is grounded.

[0017] The beneficial effects of the utility model are:

[0018] 1. This solution converts the unstable alternating current of the generator's magneto coil into low-voltage direct current to supply power to small-power power modules around the generator, such as the starting battery, igniter, fuel supply solenoid valve, and instrumentation. It can dynamically allocate external power supply based on the generator's operating conditions, reduce the operating load of the charging module, and while lowering costs, improve the stability and reliability of the charging module's external output.

[0019] 2. Real-time monitoring of the generator operation status. When the generator has abnormal speed, such as the speed is continuously too low or too high, the control circuit controls the MOS tubes of each sub-circuit to promptly cut off the external output power supply and then execute the flameout shutdown to improve the safety performance of the generator;

[0020] 3. When the generator in this solution shuts down, the power module in this utility model executes the following logic: first, power is cut off (e.g., disconnecting the power to the fuel supply solenoid valve), followed by controlling the generator to shut down (grounding the ignition signal to the primary coil of the igniter). By prioritizing the solenoid valve, the entire generator burns all the fuel in the oil circuit and combustion chamber before shutting down, effectively preventing "blow-up" during the generator shutdown process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the logical structure of this embodiment.

[0022] Figure 2 This is a schematic diagram of the sub-power supply circuit structure of the oil supply solenoid valve in this embodiment.

[0023] Figure 3Schematic diagram of the circuit decomposition of the generator output sub-circuit of this embodiment.

[0024] Figure 4 This is a control subcircuit diagram of the control unit in this embodiment.

[0025] Figure 5 Schematic diagram of the flameout control subcircuit of this embodiment.

[0026] Figure 6 This is the carbon monoxide alarm sub-circuit diagram of this embodiment.

[0027] Figure 7 This is the oil warning signal sub-circuit diagram of this embodiment.

[0028] Figure 8 Schematic diagram of the flow of the power supply method with monitoring function in this embodiment.

[0029] Description of reference numerals:

[0030] Generator output subcircuit 1, voltage regulation conversion subcircuit 2, first drive subcircuit 3, second drive subcircuit 4, speed acquisition subcircuit 5, control subcircuit 6. DETAILED DESCRIPTION

[0031] The following detailed description of the preferred embodiments of the present invention is provided in conjunction with the accompanying drawings to make the advantages and features of the present invention more easily understood by those skilled in the art, thereby more clearly defining the scope of protection of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of the present invention.

[0032] like Figure 1-7 As shown:

[0033] A general power supply circuit with a monitoring function can dynamically allocate external power supply according to the working conditions of the generator, reduce the operating load of the power supply circuit, and improve the stability and reliability of the power supply circuit's external output; it includes an engine, specifically a diesel engine or a gasoline engine, etc., wherein the engine provides power to the generator, and the generator converts the kinetic energy provided by the engine into AC power; a voltage regulation conversion sub-circuit 2, which reduces the voltage of the electric energy generated by the generator and outputs it to the electrical appliances, which include batteries, the engine's oil supply solenoid valve, igniter and instrument control panel; an acquisition unit, specifically for collecting data on the operation of the engine or generator, the acquisition unit includes a speed sensor, an oil level alarm, and a carbon monoxide alarm; wherein the carbon monoxide alarm alarms through the carbon monoxide alarm sub-circuit, and the oil level alarm alarms through the oil alarm signal sub-circuit; a control unit, specifically a single-chip microcomputer, which adjusts the power supply sequence of each port of the power output through the control sub-circuit 6.

[0034] During implementation, when the engine or generator starts, the speed data will be transmitted to the control unit through the speed sensor, and then the control subcircuit 6 of the control unit will adjust and control the power supply sequence of multiple paths at the output end of the generator;

[0035] Specifically, the electric energy generated by the generator can be directly delivered to the oil supply solenoid valve for power supply through the generator output sub-circuit 1 and the voltage regulation conversion sub-circuit 2; the oil supply solenoid valve is used to control the amount of oil entering the oil pump, and the oil supply solenoid valve is connected to the first output end of the voltage regulation conversion sub-circuit 2 through the first drive sub-circuit 3. Specifically, the voltage regulation conversion circuit 2 is as shown in the attached figure. Figure 1 , which will not be described in detail here; wherein the positive electrode of the first output terminal is connected to the positive electrode of the diode D24, the first branch of the cathode of the diode D24 is connected to the D electrode of the MOS transistor Q8, and the S electrode of the MOS transistor Q8 is one end of the output terminal of the first drive sub-circuit; the second branch of the cathode of the diode D24 is connected to the resistor R75, the first branch of the other end of the resistor R75 is connected to the G electrode of the MOS transistor Q8, the second branch of the other end of the resistor R75 is connected to the D electrode of the MOS transistor Q9, and the third branch of the other end of the resistor R75 is connected to the resistor R76; the other end of the resistor R76 is connected to the negative electrode of the first output terminal and then to ground; the G electrode of the MOS transistor Q9 is connected to the negative electrode of the first output terminal through the resistor R77 and then to ground; the S electrode of the MOS transistor Q9 is grounded, and the S electrode of the MOS transistor Q9 is the other end of the output terminal of the first drive sub-circuit 3 of the solenoid valve;

[0036] In addition, the electric energy of the fuel supply solenoid valve is also directly supplied by the battery. The battery supplies power to the fuel supply solenoid valve through the second drive sub-circuit 4 of the fuel supply solenoid valve. The specific circuit is as follows: the anode of the diode D25 of the second drive sub-circuit 4 is connected to the positive electrode of the battery, the cathode of the diode D25 is connected to the D electrode of the MOS transistor Q15 in a first branch, and the S electrode of the MOS transistor Q15 is connected between the cathode of the diode D24 and the resistor R75; the cathode of the diode D25 is connected to the negative electrode of the battery in a second branch through resistors R89 and R88; the cathode of the diode D25 is connected to the transistor end of the photoelectric coupler U18 in a third branch, and the other end of the photoelectric coupler U18 is connected between resistors R89 and R88 and then to the G electrode of the MOS transistor Q15; the anode of the light-emitting diode of the photoelectric coupler U18 is connected to the negative electrode of the battery through resistor R87, and the cathode of the light-emitting diode of the photoelectric coupler U18 is connected to the negative electrode of the power supply in a resistor R119;

[0037] During implementation, the control unit specifically controls the first driver sub-circuit and the second driver sub-circuit via the first output terminal PD3 and the second output terminal P4. Specifically, the first output terminal PD3 is connected to the G terminal of the MOS transistor Q9, and the second output terminal PD4 is connected to the positive electrode of the light-emitting diode of the photocoupler. During implementation, the paths of the first driver sub-circuit and the second driver sub-circuit are as follows:

[0038] The driving principle of the first driving sub-circuit 3 is: when the driving electrical signal of the control unit passes through the first output terminal PD3, it directly acts on the MOS transistor Q9 and the MOS transistor Q8 and turns them on, thereby allowing the electrical energy output by the rectifier output unit to be directly output to the fuel supply battery;

[0039] The driving principle of the second driving sub-circuit 4 is: the control signal of the control unit enters the second output terminal PD4, making the photoelectric coupler U18 conductive, thereby allowing the battery power to flow into the first driving sub-circuit to continuously drive the fuel supply solenoid valve.

[0040] Specifically, the speed sensor is connected to the control circuit 6 of the control unit through the speed acquisition subcircuit 5, the output end of the speed sensor is connected to the anode of the diode D21, the first branch of the cathode of the diode D21 is connected to the resistor R85, the other end of the resistor R85 is connected to the anode of the light-emitting diode of the photoelectric coupler U8, the cathode of the light-emitting diode of the photoelectric coupler U8 is connected to the resistor R83, the other end of the resistor R83 is connected to the anode of the diode D26, and the cathode of the diode D26 is grounded; the second branch of the cathode of the diode D21 is connected to the capacitor C40, the other end of the capacitor C40 is connected between the photoelectric coupler U8 and the resistor R83; one end of the transistor of the photoelectric coupler U8 is connected to the power supply, and the other end of the transistor of the photoelectric coupler U8 is connected to the input end PC4 of the control unit through the filter circuit;

[0041] The signal output terminal PC3 of the control unit is connected to a resistor R106, the other end of the resistor R106 is connected to the anode of the diode of the photoelectric coupler U17, and the cathode of the diode of the photoelectric coupler U17 is grounded; the transistor part of the photoelectric coupler U17 is located in the flameout circuit, the first branch connected to the positive pole of the flameout circuit is connected to the resistor R1, the first branch at the other end of the resistor R1 is connected to the B pole of the transistor Q19, the C pole of the transistor Q19 is connected to the second branch at the positive pole of the flameout circuit, the second branch at the other end of the resistor R1 is connected to the first end of the transistor of the photoelectric coupler U17, the first branch of the E pole of the transistor Q17 is connected to the positive pole of the capacitor C50, the other end of the capacitor C50 is grounded, the second branch of the E pole of the transistor Q17 is connected to the resistor R108 and then grounded; the second branch at the other end of the resistor R1 is connected to one end of the transistor of the photoelectric coupler U17, and the other end of the transistor of the photoelectric coupler U17 is grounded.

[0042] When collecting the speed sensor signal, the electrical signal of the speed sensor enters the diode of the photoelectric coupler U8 through the diode 21 and the resistor R85, and the light-emitting diode of the photoelectric coupler U8 emits light, thereby turning on the transistor of the photoelectric coupler, so that the voltage signal on the right enters the control unit (single-chip microcomputer) from the resistor R84 and the transistor end of the photoelectric coupler U8 and the filter circuit. When the startup is unsuccessful, the control unit controls the battery to continuously supply power to the first drive sub-circuit. After the startup is successful, the voltage regulation conversion sub-circuit directly supplies power to the fuel supply solenoid valve; if the speed is abnormal, the control unit turns on the photoelectric coupler U17 through the signal output terminal PC3, so that the flameout line is grounded to achieve flameout.

[0043] The specific implementation process of this plan includes the following steps:

[0044] S1, start, the battery supplies power to the fuel supply solenoid valve and igniter, ignites the engine, and drives the generator through the engine;

[0045] S2, converting the AC power produced by the generator into DC output after stepping down the voltage through the voltage regulation conversion circuit;

[0046] S3. The converted DC output directly powers the ignition device and the fuel supply solenoid valve; the control unit then determines whether the engine is started successfully based on the engine and generator operation data collected by the acquisition unit;

[0047] S31. Determine whether the speed of the generator rotor coil is greater than 2000 revolutions per minute or whether the voltage supplied by the generator to the voltage regulation conversion circuit is greater than 15V. If both the speed and voltage are greater than the set parameters, the engine is started successfully; otherwise, a restart is required.

[0048] S32. After the engine is successfully started, the power collection unit and other power supply components supply power to the battery; specifically, power the speed sensor, the oil level alarm, the carbon monoxide alarm, and charge the battery;

[0049] S33. The control unit determines whether the generator or engine is abnormal based on the data collected by the acquisition unit. If the speed data, oil level, and data collected by the carbon monoxide alarm are normal, the power supply is continued; otherwise, the power supply battery valve and loads unrelated to the power are first cut off, and then the engine and generator are shut down for a delay of 1 second. This allows the remaining fuel in the engine to burn out, thereby avoiding abnormal noise (explosion) when the engine and generator are shut down.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention shall be defined by the appended claims.

Claims

1. A general power supply circuit with a monitoring function, comprising an engine, a generator, and electrical appliances powered by the generator, wherein the electrical appliances include a battery for the generator, an oil supply solenoid valve for the engine, an igniter for the engine, and an instrument control panel, characterized in that: It also includes a voltage regulation conversion unit, the input end of the voltage regulation conversion unit is connected to the output end of the engine through the voltage regulation conversion sub-circuit, and is used to reduce the voltage of the AC power produced by the generator and convert it into DC output; an electrical appliance power supply sub-circuit, whose input end is connected to the output end of the voltage regulation conversion unit; an acquisition unit, including a speed sensor, whose data acquisition end is connected to the engine or generator; a control unit, which includes an MCU and a control sub-circuit, the MCU is connected to the signal output end of the speed sensor, and the MCU is also connected to the electrical appliance power supply sub-circuit through the control sub-circuit.

2. The power supply circuit with monitoring function according to claim 1, characterized in that: The MCU is a single chip microcomputer, and the acquisition unit also includes an oil alarm for monitoring the amount of engine oil and a CO alarm for monitoring the carbon monoxide in the engine.

3. The power supply circuit with monitoring function according to claim 1, characterized in that: The electrical appliance power supply sub-circuit also includes a first driver sub-circuit. The first output terminal of the voltage regulation and conversion sub-circuit is connected to the input terminal of the first driver sub-circuit. The anode of the first output terminal is connected to the anode of diode D24. The first branch of the cathode of diode D24 is connected to the D terminal of MOS transistor Q8. The S terminal of MOS transistor Q8 serves as one end of the output terminal of the first driver sub-circuit. The second branch of the cathode of diode D24 is connected to resistor R75. The first branch of the other end of resistor R75 is connected to the G terminal of MOS transistor Q8. The second branch of the other end of resistor R75 is connected to the D terminal of MOS transistor Q9. The third branch of the other end of resistor R75 is connected to resistor R76. The other end of resistor R76 is connected to the cathode of the first output terminal and then to ground. The G terminal of MOS transistor Q9 is connected to the cathode of the first output terminal through resistor R77 and then to ground. The S terminal of MOS transistor Q9 is grounded. The S terminal of MOS transistor Q9 serves as the other end of the output terminal of the first driver sub-circuit.

4. The power supply circuit with monitoring function according to claim 3, characterized in that: The battery and the fuel supply solenoid valve are electrically connected. The battery supplies power to the fuel supply battery valve through the second drive subcircuit of the electrical appliance power supply electronic circuit. The anode of the diode D25 of the second drive subcircuit is connected to the anode of the battery. The cathode of the diode D25 has a first branch connected to the D pole of the MOS transistor Q15. The S pole of the MOS transistor Q15 is connected between the cathode of the diode D24 and the resistor R75. The cathode of the diode D25 has a second branch connected to the cathode of the battery through resistors R89 and R88. The cathode of the diode D25 has a third branch connected to the transistor end of the photoelectric coupler U18. The other end of the transistor of the photoelectric coupler U18 is connected between resistors R89 and R88 and then to the G pole of the MOS transistor Q15. The anode of the light-emitting diode of the photoelectric coupler U18 is connected to the cathode of the battery through resistor R87, and the cathode of the light-emitting diode of the photoelectric coupler U18 is connected to the negative pole of the power supply through resistor R119.

5. The power supply circuit with monitoring function according to claim 4, characterized in that: The control unit includes a first output terminal PD3 and a second output terminal P4. The first output terminal PD3 is connected to the G terminal of the MOS tube Q9, and the second output terminal PD4 is connected to the positive electrode of the light emitting diode of the photoelectric coupler.

6. The power supply circuit with monitoring function according to claim 5, characterized in that: The speed sensor is connected to the control unit through a speed acquisition subcircuit. The signal output end of the speed sensor is connected to the anode of the diode D21. The first branch of the cathode of the diode D21 is connected to a resistor R85. The other end of the resistor R85 is connected to the anode of the light-emitting diode of the photoelectric coupler U8. The cathode of the light-emitting diode of the photoelectric coupler U8 is connected to a resistor R83. The other end of the resistor R83 is connected to the anode of the diode D26. The cathode of the diode D26 is grounded. The second branch of the cathode of the diode D21 is connected to a capacitor C40. The other end of the capacitor C40 is connected between the photoelectric coupler U8 and the resistor R83. One end of the transistor of the photoelectric coupler U8 is connected to the power supply, and the other end of the transistor of the photoelectric coupler U8 is connected to the input end PC4 of the control unit through a filtering circuit.

7. The power supply circuit with monitoring function according to claim 6, characterized in that: The signal output terminal PC3 of the control unit is connected to a resistor R106, the other end of the resistor R106 is connected to the anode of the diode of the photoelectric coupler U17, and the cathode of the diode of the photoelectric coupler U17 is grounded; the transistor part of the photoelectric coupler U17 is located in the flameout sub-circuit, the first branch connected to the positive pole of the flameout sub-circuit is connected to the resistor R1, the first branch at the other end of the resistor R1 is connected to the B pole of the transistor Q19, the C pole of the transistor Q19 is connected to the second branch of the positive pole of the flameout circuit, the second branch at the other end of the resistor R1 is connected to the first end of the transistor of the photoelectric coupler U17, the first branch of the E pole of the transistor Q17 is connected to the positive pole of the capacitor C50, the other end of the capacitor C50 is grounded, the second branch of the E pole of the transistor Q17 is connected to the resistor R108 and then grounded; the second branch at the other end of the resistor R1 is connected to one end of the transistor of the photoelectric coupler U17, and the other end of the transistor of the photoelectric coupler U17 is grounded.

Images