Ignition control system

Abstract

The application relates to the field of spark ignition technology, and proposes a spark control system, which comprises a spark control circuit, the spark control circuit comprises an operational amplifier U2, a resistor R5, a switching tube Q4, a transformer T1, a resistor R4, a spark generator J1 and an optical coupler U3, the inverting input end of the operational amplifier U2 is used for receiving a sawtooth wave signal, the output end of the operational amplifier U2 is connected with the control end of the switching tube Q4 through the resistor R5, the first end of the switching tube Q4 is connected with the first input end of the transformer T1, the second input end of the transformer T1 is connected with a 12V power supply, the first output end of the transformer T1 is connected with the spark generator J1, the first end of the resistor R4 is connected with the first output end of the transformer T1, the second end of the resistor R4 is connected with the first input end of the optical coupler U3, the second input end of the optical coupler U3 is grounded, the first output end of the optical coupler U3 is connected with the 12V power supply, and the second output end of the optical coupler U3 is connected with the non-inverting input end of the operational amplifier U2. Through the technical scheme, the problem of poor reliability and stability of the spark control system in the related art is solved.

Description

Technical Field

[0001] This invention relates to the field of flare ignition technology, and more specifically, to an ignition control system. Background Technology

[0002] The coke oven venting ignition system (ignition control system) plays a crucial role in coke oven production as an emergency venting ignition system. The leakage of raw coke oven gas is a major source of pollution in the coking process. When the gas blower malfunctions, there is a major power outage in the coke oven, or the raw gas drainage system fails, causing persistently high pressure in the gas collecting pipe, the raw gas can only be directly discharged into the atmosphere, causing significant pollution. This can also lead to smoke and fire from the coke oven riser pipe, coal charging port, and furnace doors, and even damage to the iron components of the coke oven. The coke oven venting ignition system ignites the vented raw gas, preventing its direct release into the atmosphere, thus reducing environmental pollution, maintaining stable system pressure, and reducing the workload of workers. Due to the complex environment of coke oven production, the power supply to the raw gas ignition and venting system is unstable, resulting in poor reliability and stability of the existing ignition control system, which cannot ensure timely ignition and combustion of the raw gas during coke oven venting. Summary of the Invention

[0003] This invention proposes an ignition control system that solves the problems of poor reliability and stability in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] An ignition control system includes an ignition control circuit, which comprises a resistor R3, an operational amplifier U2, resistors R9, R11, R5, a switching transistor Q4, a transformer T1, resistors R4 and R7, an igniter J1, an optocoupler U3, and a resistor R10.

[0006] The first terminal of resistor R3 is used to receive sawtooth wave signals. The second terminal of resistor R3 is connected to the inverting input terminal of operational amplifier U2. The non-inverting input terminal of operational amplifier U2 is grounded through resistor R9. The output terminal of operational amplifier U2 is connected to the control terminal of switching transistor Q4 through resistor R5. The first terminal of switching transistor Q4 is connected to the first input terminal of transformer T1. The second input terminal of transformer T1 is connected to a 12V power supply. The first output terminal of transformer T1 is connected to igniter J1.

[0007] The first end of resistor R4 is connected to the first output terminal of transformer T1, the second end of resistor R4 is grounded through resistor R7, the second end of resistor R4 is connected to the first input terminal of optocoupler U3, the second input terminal of optocoupler U3 is grounded, the first output terminal of optocoupler U3 is connected to a 12V power supply through resistor R11, and the second output terminal of optocoupler U3 is connected to the non-inverting input terminal of operational amplifier U2 through resistor R10.

[0008] Furthermore, the ignition control circuit of the present invention also includes a resistor R13, a capacitor C1, a resistor R1, a transistor Q2, and a resistor R2. The first end of the resistor R13 is connected to a 12V power supply, the second end of the resistor R13 is grounded through the capacitor C1, and the second end of the resistor R13 is connected to the control terminal of the transistor Q2. The first end of the resistor R1 is connected to a 12V power supply, the second end of the resistor R2 is connected to the first end of the transistor Q2, the second end of the transistor Q2 is grounded through the resistor R2, and the second end of the transistor Q2 is connected to the first end of the resistor R3.

[0009] Furthermore, the ignition control circuit of the present invention also includes a resistor R6 and a switching transistor Q3. The first end of the resistor R6 is connected to the output terminal of the operational amplifier U2, the second end of the resistor R6 is connected to the control terminal of the switching transistor Q3, the first end of the switching transistor Q3 is connected to the third input terminal of the transformer T1, and the second end of the switching transistor Q3 is grounded.

[0010] Furthermore, the ignition control circuit of the present invention also includes a capacitor C5, a Zener diode D3, and a transistor Q1. The first end of the capacitor C5 is connected to the second end of the resistor R4, and the second end of the capacitor C5 is grounded. The cathode of the Zener diode D3 is connected to the first end of the capacitor C5, the anode of the Zener diode D3 is connected to the control terminal of the transistor Q1, the anode of the transistor Q1 is connected to the first output terminal of the transformer T1, and the cathode of the transistor Q1 is connected to the igniter J1.

[0011] Furthermore, the present invention also includes a power supply circuit, which includes a transformer T2, a rectifier bridge U1, and a capacitor C7. The first input terminal of the transformer T2 is connected to the live wire, and the second input terminal of the transformer T2 is connected to the neutral wire. The first output terminal of the transformer T1 is connected to the first input terminal of the rectifier bridge U1, and the second output terminal of the transformer T1 is connected to the second input terminal of the rectifier bridge U1. The first output terminal of the rectifier bridge U1 is connected to the first terminal of the capacitor C7. The second output terminal of the rectifier bridge U1 is grounded, and the second terminal of the capacitor C7 is grounded. The first output terminal of the rectifier bridge U1 serves as a 12V power supply terminal.

[0012] Furthermore, the present invention also includes a voltage regulator circuit, which includes a switching transistor Q7, an operational amplifier U4, resistors R14, R16, and R15. The first terminal of the switching transistor Q7 is connected to the first output terminal of the rectifier bridge U1, and the second terminal of the switching transistor Q7 serves as a 12V power supply terminal. The first terminal of the resistor R16 is connected to the second terminal of the switching transistor Q7, and the second terminal of the resistor R16 is grounded through the resistor R15. The second terminal of the resistor R16 is connected to the inverting input terminal of the operational amplifier U4, and the non-inverting input terminal of the operational amplifier U4 is connected to the Vref reference voltage. The output terminal of the operational amplifier U4 is connected to the inverting input terminal of the operational amplifier U4 through the resistor R14, and the output terminal of the operational amplifier U4 is connected to the control terminal of the switching transistor Q7.

[0013] The working principle and beneficial effects of this invention are as follows:

[0014] In this invention, the ignition control system is used to ensure that the raw coal gas is ignited in time during coke oven venting. The working principle of the ignition control circuit is as follows: When powered on, the non-inverting input terminal of operational amplifier U2 is used to receive a sawtooth wave signal. Operational amplifier U2 forms a comparator. Under normal circumstances, the output pulse signal of operational amplifier U2 is applied to the control terminal of switching transistor Q4. When the pulse signal is high level, the 12V power supply is grounded after passing through the input coil of transformer T1 and switching transistor Q4. The input coil of transformer T1 generates a voltage, and the output coil of transformer T1 generates an induced voltage. Transformer T1 is used to boost the 12V voltage to 24V. At this time, igniter J1 is ignited, thereby igniting the raw coal gas during coke oven venting. When the pulse signal is low, the switching transistor Q4 is cut off. At this time, the voltage in the input coil of transformer T1 disappears, and the induced voltage in the output coil of transformer T1 disappears. Igniter J1 is then powered by capacitor C2. When the pulse signal becomes high again, the output coil of transformer T1 outputs 24V power again. Therefore, driven by the pulse signal, igniter J1 is ignited by the 24V power supply.

[0015] Due to the complex production environment of coke ovens, the 12V power supply can become unstable, leading to instability in the output voltage of transformer T1. When the operating voltage of igniter J1 is less than 24V, it may fail to ignite properly. When the operating voltage of igniter J1 is greater than 24V, its output power will increase, which will affect the service life of igniter J1 in the long run. Consequently, the reliability and safety of flare ignition cannot be guaranteed.

[0016] Therefore, when the operating voltage of igniter J1 is below 24V, the voltage division across resistor R7 decreases, thus reducing the power of the LED inside optocoupler U3. This reduces the output current of optocoupler U3, resulting in a decrease in the voltage at the non-inverting input of operational amplifier U2. When the voltage at the non-inverting input of operational amplifier U2 decreases, the high-level time of the pulse signal output by operational amplifier U2 within the same cycle becomes longer, increasing the conduction time of switching transistor Q4, thereby increasing the average output voltage on the output coil of transformer T1. When the operating voltage of igniter J1 is above 24V, the voltage division across resistor R7 increases, thus increasing the power of the LED inside optocoupler U3. This increases the output current of optocoupler U3, resulting in a larger voltage at the non-inverting input of operational amplifier U2. When the voltage at the non-inverting input of operational amplifier U2 increases, the high-level time of the pulse signal output by operational amplifier U2 within the same cycle becomes shorter, reducing the conduction time of switching transistor Q4, thereby decreasing the average output voltage on the output coil of transformer T1. Therefore, the ignition control circuit in this invention can output a stable 24V voltage, improving the stability of the igniter J1 and thus ensuring the reliability and safety of flare ignition. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a circuit diagram of the ignition control circuit in this invention;

[0019] Figure 2 This is a circuit diagram of the power supply circuit in this invention;

[0020] Figure 3 This is a circuit diagram of the voltage regulator circuit in this invention. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] like Figure 1As shown, this embodiment proposes an ignition control system, including an ignition control circuit. The ignition control circuit includes resistor R3, operational amplifier U2, resistors R9, R11, R5, switching transistor Q4, transformer T1, resistors R4 and R7, igniter J1, optocoupler U3, and resistor R10. The first terminal of resistor R3 is used to receive a sawtooth wave signal, and the second terminal of resistor R3 is connected to the inverting input terminal of operational amplifier U2. The non-inverting input terminal of operational amplifier U2 is grounded through resistor R9, and the output terminal of operational amplifier U2 is connected to the control terminal of switching transistor Q4 through resistor R5. Q4's first terminal is connected to the first input terminal of transformer T1. The second input terminal of transformer T1 is connected to a 12V power supply. The first output terminal of transformer T1 is connected to igniter J1. The first terminal of resistor R4 is connected to the first output terminal of transformer T1. The second terminal of resistor R4 is grounded through resistor R7. The second terminal of resistor R4 is connected to the first input terminal of optocoupler U3. The second input terminal of optocoupler U3 is grounded. The first output terminal of optocoupler U3 is connected to a 12V power supply through resistor R11. The second output terminal of optocoupler U3 is connected to the non-inverting input terminal of operational amplifier U2 through resistor R10.

[0024] In this embodiment, the ignition control system is used to ensure that the raw coal gas is ignited in time during coke oven venting. The working principle of the ignition control circuit is as follows: When powered on, the non-inverting input terminal of operational amplifier U2 is used to receive the sawtooth wave signal. Operational amplifier U2 forms a comparator. Under normal circumstances, the output pulse signal of operational amplifier U2 is applied to the control terminal of switching transistor Q4. When the pulse signal is high level, the 12V power supply is grounded after passing through the input coil of transformer T1 and switching transistor Q4. The input coil of transformer T1 generates a voltage, and the output coil of transformer T1 generates an induced voltage. Transformer T1 is used to boost the 12V voltage to 24V. At this time, igniter J1 is ignited, thereby igniting the raw coal gas during coke oven venting. When the pulse signal is low, the switching transistor Q4 is cut off. At this time, the voltage in the input coil of transformer T1 disappears, and the induced voltage in the output coil of transformer T1 disappears. Igniter J1 is then powered by capacitor C2. When the pulse signal becomes high again, the output coil of transformer T1 outputs 24V power again. Therefore, driven by the pulse signal, igniter J1 is ignited by the 24V power supply.

[0025] Due to the complex production environment of coke ovens, the 12V power supply can become unstable, leading to instability in the output voltage of transformer T1. When the operating voltage of igniter J1 is less than 24V, it may fail to ignite properly. When the operating voltage of igniter J1 is greater than 24V, its output power will increase, which will affect the service life of igniter J1 in the long run. Consequently, the reliability and safety of flare ignition cannot be guaranteed.

[0026] Therefore, when the operating voltage of igniter J1 is below 24V, the voltage division across resistor R7 decreases, thus reducing the power of the LED inside optocoupler U3. This reduces the output current of optocoupler U3, resulting in a decrease in the voltage at the non-inverting input of operational amplifier U2. When the voltage at the non-inverting input of operational amplifier U2 decreases, the high-level time of the pulse signal output by operational amplifier U2 within the same cycle becomes longer, increasing the conduction time of switching transistor Q4, thereby increasing the average output voltage on the output coil of transformer T1. When the operating voltage of igniter J1 is above 24V, the voltage division across resistor R7 increases, thus increasing the power of the LED inside optocoupler U3. This increases the output current of optocoupler U3, resulting in a larger voltage at the non-inverting input of operational amplifier U2. When the voltage at the non-inverting input of operational amplifier U2 increases, the high-level time of the pulse signal output by operational amplifier U2 within the same cycle becomes shorter, reducing the conduction time of switching transistor Q4, thereby decreasing the average output voltage on the output coil of transformer T1. Therefore, in this embodiment, the ignition control circuit can output a stable 24V voltage, improving the stability of the igniter J1 and thus ensuring the reliability and safety of flare ignition.

[0027] like Figure 1 As shown, the ignition control circuit in this embodiment also includes resistor R13, capacitor C1, resistor R1, transistor Q2, and resistor R2. The first end of resistor R13 is connected to a 12V power supply, and the second end of resistor R13 is grounded through capacitor C1. The second end of resistor R13 is connected to the control terminal of transistor Q2. The first end of resistor R1 is connected to a 12V power supply, and the second end of resistor R2 is connected to the first end of transistor Q2. The second end of transistor Q2 is grounded through resistor R2, and the second end of transistor Q2 is connected to the first end of resistor R3.

[0028] In this embodiment, resistor R13, capacitor C1, resistor R2, transistor Q2, and resistor R2 constitute a signal generator for outputting a sawtooth wave signal. Specifically, the signal generator works as follows: Upon power-up, the 12V power supply charges capacitor C1 through resistor R13. When the charging voltage of capacitor C1 is higher than the peak voltage of transistor Q2, transistor Q2 turns on, generating a voltage signal across resistor R2. Simultaneously with transistor Q2's conduction, capacitor C1 begins to discharge. As the voltage across capacitor C1 decreases, the voltage across resistor R2 also decreases. When the voltage across capacitor C1 falls below the valley voltage of transistor Q2, transistor Q2 turns off, the voltage across resistor R2 disappears, and capacitor C1 re-enters charging mode, thus forming a cycle. This generates a sawtooth wave signal across resistor R2, which is then applied to the inverting input of operational amplifier U2. By changing the value of resistor R13 or capacitor C1, the charging and discharging time of capacitor C1 can be changed, thereby adjusting the output voltage of transformer T1.

[0029] like Figure 1As shown, the ignition control circuit in this embodiment also includes a resistor R6 and a switching transistor Q3. The first end of the resistor R6 is connected to the output terminal of the operational amplifier U2, the second end of the resistor R6 is connected to the control terminal of the switching transistor Q3, the first end of the switching transistor Q3 is connected to the third input terminal of the transformer T1, and the second end of the switching transistor Q3 is grounded.

[0030] In this embodiment, when the switching transistor Q4 changes from the on state to the off state, a reverse electromotive force will be generated on the input coil of the transformer T1. This reverse electromotive force can easily saturate the magnetic flux of the core of the transformer T1. This phenomenon will cause the output voltage of the transformer T1 to fluctuate, which will increase the loss of the transformer T1, cause the transformer T1 to heat up severely, and affect the service life of the transformer T1.

[0031] Therefore, the ignition control circuit in this embodiment also includes a reverse excitation circuit, which consists of a resistor R6 and a switching transistor Q3. When the pulse signal output by the operational amplifier U2 is high, the switching transistor Q4 is turned on and the switching transistor Q3 is turned off. When the pulse signal output by the operational amplifier U2 is low, the switching transistor Q4 is turned off and the switching transistor Q3 is turned on, thereby quickly dissipating the reverse electromotive force generated in the input coil of the transformer T1, thus effectively preventing the core flux saturation of the transformer T1.

[0032] like Figure 1 As shown, the ignition control circuit in this embodiment also includes a capacitor C5, a Zener diode D3, and a transistor Q1. The first end of the capacitor C5 is connected to the second end of the resistor R4, and the second end of the capacitor C5 is grounded. The cathode of the Zener diode D3 is connected to the first end of the capacitor C5, the anode of the Zener diode D3 is connected to the control terminal of the transistor Q1, the anode of the transistor Q1 is connected to the first output terminal of the transformer T1, and the cathode of the transistor Q1 is connected to the igniter J1.

[0033] Because the coke oven production environment is relatively complex, the switching transistor Q4 may be accidentally triggered, causing a voltage signal to be generated in the input coil of the transformer T1. This causes the igniter J1 to be ignited when it is not needed, which will affect the service life of the igniter J1 in the long run. Therefore, a buffer circuit is added to the ignition control circuit in this embodiment. The buffer circuit consists of capacitor C5, Zener diode D3 and transistor Q1.

[0034] When the circuit is operating normally, the output coil of transformer T1 generates an induced voltage, which simultaneously generates a voltage signal across resistor R7. This voltage signal charges capacitor C5. When the charging voltage of capacitor C5 exceeds the breakdown voltage of Zener diode D3, Zener diode D3 conducts, the control terminal of transistor Q1 is at a high level, and transistor Q1 conducts. At this time, 24V power is applied to igniter J1. When switching transistor Q4 is falsely triggered, a short-term pulse voltage is generated on the output coil of transformer T1. This voltage signal is divided by resistors R4 and R7 and charges capacitor C5. When the false trigger signal disappears, the charging voltage of capacitor C5 is less than the breakdown voltage of Zener diode D3, Zener diode D3 is cut off, and transistor Q1 is also cut off. Therefore, igniter J1 does not work.

[0035] like Figure 2 As shown, this embodiment also includes a power supply circuit, which includes a transformer T2, a rectifier bridge U1, and a capacitor C7. The first input terminal of the transformer T2 is connected to the live wire, and the second input terminal of the transformer T2 is connected to the neutral wire. The first output terminal of the transformer T1 is connected to the first input terminal of the rectifier bridge U1, and the second output terminal of the transformer T1 is connected to the second input terminal of the rectifier bridge U1. The first output terminal of the rectifier bridge U1 is connected to the first terminal of the capacitor C7. The second output terminal of the rectifier bridge U1 is grounded, and the second terminal of the capacitor C7 is grounded. The first output terminal of the rectifier bridge U1 serves as a 12V power supply terminal.

[0036] In this embodiment, the power supply circuit is used to convert 220V AC voltage into 12V DC signal. Specifically, transformer T2 is a step-down transformer that converts 220V AC voltage into a small AC signal. Rectifier bridge U1 is used to convert the AC output of transformer T2 into pulsating DC. Capacitor C7 acts as a filter and is used to convert the pulsed DC output of rectifier bridge U1 into a 12V DC signal output. This 12V voltage is used as the working voltage of the ignition control circuit.

[0037] like Figure 3 As shown, this embodiment also includes a voltage regulator circuit, which includes a switching transistor Q7, an operational amplifier U4, resistors R14, R16, and R15. The first terminal of the switching transistor Q7 is connected to the first output terminal of the rectifier bridge U1, and the second terminal of the switching transistor Q7 serves as the 12V power supply terminal. The first terminal of the resistor R16 is connected to the second terminal of the switching transistor Q7, and the second terminal of the resistor R16 is grounded through the resistor R15. The second terminal of the resistor R16 is connected to the inverting input terminal of the operational amplifier U4, and the non-inverting input terminal of the operational amplifier U4 is connected to the Vref reference voltage. The output terminal of the operational amplifier U4 is connected to the inverting input terminal of the operational amplifier U4 through the resistor R14, and the output terminal of the operational amplifier U4 is connected to the control terminal of the switching transistor Q7.

[0038] To further improve power supply stability, a voltage regulator circuit is also included in this embodiment to keep the 12V power supply as stable as possible.

[0039] Resistors R16 and R15 form a voltage divider circuit. The voltage across resistor R15 is taken as the sampling voltage and applied to the inverting input of operational amplifier U4, which then functions as a subtractor. When the 12V voltage is too high, the voltage at the inverting input of operational amplifier U4 increases, leading to a decrease in its output voltage. This, in turn, reduces the voltage at the control terminal of switching transistor Q7, thus decreasing the voltage at the second terminal of Q7. Conversely, when the 12V voltage is too low, the voltage at the inverting input of operational amplifier U4 decreases, leading to an increase in its output voltage. This, in turn, increases the voltage at the control terminal of switching transistor Q7, further increasing the voltage at the second terminal of Q7. Ultimately, this stabilizes the voltage at the second terminal of switching transistor Q7 at 12V, improving the reliability of the circuit.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A firing control system characterized by, The ignition control circuit comprises resistance R3, operational amplifier U2, resistance R9, resistance R11, resistance R5, switch tube Q4, transformer T1, resistance R4, resistance R7, igniter J1, optocoupler U3 and resistance R10, The first end of the resistance R3 is used for receiving a sawtooth wave signal, the second end of the resistance R3 is connected to the inverting input end of the operational amplifier U2, the non-inverting input end of the operational amplifier U2 is grounded through the resistance R9, the output end of the operational amplifier U2 is connected to the control end of the switch tube Q4 through the resistance R5, the first end of the switch tube Q4 is connected to the first input end of the transformer T1, the second input end of the transformer T1 is connected to a 12V power supply, and the first output end of the transformer T1 is connected to the igniter J1, The first end of the resistance R4 is connected to the first output end of the transformer T1, the second end of the resistance R4 is grounded through the resistance R7, the second end of the resistance R4 is connected to the first input end of the optocoupler U3, the second input end of the optocoupler U3 is grounded, the first output end of the optocoupler U3 is connected to a 12V power supply through the resistance R11, and the second output end of the optocoupler U3 is connected to the non-inverting input end of the operational amplifier U2 through the resistance R10; The ignition control circuit further comprises resistance R6 and switch tube Q3, the first end of the resistance R6 is connected to the output end of the operational amplifier U2, the second end of the resistance R6 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the third input end of the transformer T1, and the second end of the switch tube Q3 is grounded. The ignition control circuit further comprises capacitor C5, voltage stabilizing tube D3 and transistor Q1, the first end of the capacitor C5 is connected to the second end of the resistance R4, the second end of the capacitor C5 is grounded, the cathode of the voltage stabilizing tube D3 is connected to the first end of the capacitor C5, the anode of the voltage stabilizing tube D3 is connected to the control end of the transistor Q1, the anode of the transistor Q1 is connected to the first output end of the transformer T1, and the cathode of the transistor Q1 is connected to the igniter J1.

2. The ignition control system of claim 1, wherein The ignition control circuit further comprises resistance R13, capacitor C1, resistance R1, transistor Q2 and resistance R2, the first end of the resistance R13 is connected to a 12V power supply, the second end of the resistance R13 is grounded through the capacitor C1, the second end of the resistance R13 is connected to the control end of the transistor Q2, the first end of the resistance R1 is connected to a 12V power supply, the second end of the resistance R2 is connected to the first end of the transistor Q2, the second end of the transistor Q2 is grounded through the resistance R2, and the second end of the transistor Q2 is connected to the first end of the resistance R3.

3. The ignition control system of claim 1, wherein The power supply circuit comprises a transformer T2, a rectifier bridge U1 and a capacitor C7, a first input end of the transformer T2 is connected with the live wire, a second input end of the transformer T2 is connected with the zero line, a first output end of the transformer T1 is connected with a first input end of the rectifier bridge U1, a second output end of the transformer T1 is connected with a second input end of the rectifier bridge U1, a first output end of the rectifier bridge U1 is connected with a first end of the capacitor C7, a second output end of the rectifier bridge U1 is grounded, a second end of the capacitor C7 is grounded, and the first output end of the rectifier bridge U1 is used as a 12V power supply end.

4. The ignition control system of claim 3, wherein The voltage stabilizing circuit comprises a switch tube Q7, an operational amplifier U4, a resistor R14, a resistor R16 and a resistor R15, a first end of the switch tube Q7 is connected with the first output end of the rectifier bridge U1, a second end of the switch tube Q7 is used as the 12V power supply end, a first end of the resistor R16 is connected with the second end of the switch tube Q7, a second end of the resistor R16 is grounded through the resistor R15, the second end of the resistor R16 is connected with an inverting input end of the operational amplifier U4, a non-inverting input end of the operational amplifier U4 is connected with a Vref reference voltage, an output end of the operational amplifier U4 is connected with the non-inverting input end of the operational amplifier U4 through the resistor R14, and the output end of the operational amplifier U4 is connected with a control end of the switch tube Q7.

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