A variable-energy ignition circuit for aircraft engines

Abstract

This invention discloses a variable-energy ignition circuit for aero-engines, comprising a filter circuit, a DC-AC inverter boost circuit, and an energy storage and discharge circuit connected sequentially. The input of the filter circuit is connected to a digital controller. A peak current sampling control circuit is connected to both the DC-AC inverter boost circuit and the digital controller, and the energy storage and discharge circuit is also connected to the digital controller. The peak current of the DC-AC inverter boost circuit is controlled by the peak current sampling control circuit. The digital controller samples the voltage value on the energy storage capacitor in the energy storage and discharge circuit to perform analysis and calculation of the charging voltage signal. When the calculated charging voltage signal reaches a predetermined value, the digital controller outputs a discharge control signal to the energy storage and discharge circuit to control the circuit to conduct and output a high-voltage pulse signal. This invention solves the problem that existing ignition circuit designs increase the load on the engine during normal operation, adversely affecting the lifespan of the ignition nozzle.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the field of aviation power technology, and particularly to a variable energy ignition circuit for aircraft engines. Background Technology

[0002] In the existing design of aero-engine ignition circuits, the capacitance of the capacitor used for energy storage is a fixed value, and the breakdown voltage of the discharge switch fluctuates within a very small range. Therefore, once the parameters of the ignition device are fixed, the energy storage is basically a fixed value, and the spark energy output during ignition fluctuates within a certain small range.

[0003] In order to achieve better engine performance throughout the entire operating envelope, the ignition device is usually designed with energy storage to meet the maximum demand under extreme normal operating conditions. This causes the ignition system to operate at maximum demand throughout its life cycle, thereby increasing the load on the engine during normal operation and having a certain impact on the life of the ignition nozzle. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems. This invention provides a variable energy ignition circuit for aero engines to address the problem that existing ignition circuits, due to their fixed energy storage and the fact that the energy storage is usually designed to meet the maximum requirements of extreme normal operating conditions, increase the load on the engine during normal operation and adversely affect the lifespan of the ignition nozzle.

[0005] The technical solution of the present invention: The embodiments of the present invention provide a variable energy ignition circuit for aero engines, including: a digital controller, a filter circuit, a DC-AC inverter boost circuit, a peak current sampling control circuit, and an energy storage and discharge circuit;

[0006] The filter circuit, DC-AC inverter boost circuit, and energy storage discharge circuit are connected in sequence. The input terminal of the filter circuit is connected to the digital controller to provide power to the variable energy ignition circuit through the digital controller.

[0007] The peak current sampling control circuit is connected to the DC-AC inverter boost circuit and the digital controller respectively, and the energy storage discharge circuit is also connected to the digital controller.

[0008] The variable energy ignition circuit is used to provide power to the variable energy ignition circuit through a digital controller, and to send a reference voltage signal to the peak current sampling control circuit through the digital controller, so as to control the peak current of the DC-AC inverter boost circuit through the peak current sampling control circuit.

[0009] The variable energy ignition circuit is also used to sample the voltage value on the energy storage capacitor in the energy storage discharge circuit through the digital controller to perform analysis and calculation of the charging voltage signal. When the calculated charging voltage signal reaches a predetermined value, the digital controller outputs a discharge control signal to the energy storage discharge circuit to control the energy storage discharge circuit to conduct and output a high voltage pulse signal, that is, to control the discharge frequency.

[0010] Optionally, in the variable-energy ignition circuit for aero-engines as described above,

[0011] The filtering circuit is used to suppress input power noise and interference signals generated by the operation of the variable ignition circuit in both directions, ensuring that the variable ignition circuit works normally and does not interfere with the power supply.

[0012] The DC-AC inverter boost circuit is a self-excited DC-AC inverter boost circuit, used to convert the input low-voltage DC power into high-voltage AC pulse power.

[0013] Optionally, in the variable-energy ignition circuit for aero-engines as described above,

[0014] The peak current sampling control circuit is used to sample the peak current of the DC-AC inverter boost circuit and convert the collected peak current signal into a voltage signal, which is compared with the reference voltage signal output by the digital controller. When the sampled voltage signal is higher than the reference voltage signal, a high-level signal is output. The high-level signal controls the DC-AC inverter boost circuit. When the signal is high, the DC-AC inverter boost circuit stops working; when the signal is low, the DC-AC inverter boost circuit works normally.

[0015] Optionally, in the variable-energy ignition circuit for aero-engines as described above,

[0016] The energy storage and discharge circuit is used to convert the AC pulse power output by the DC-AC inverter boost circuit into high-voltage DC power and store it in the energy storage capacitor. When the voltage across the energy storage capacitor reaches the set discharge voltage, the discharge switch is turned on and a high-voltage signal is output.

[0017] Optionally, in the variable-energy ignition circuit for aero-engines as described above,

[0018] By adding a sampling resistor across the energy storage capacitor in the energy storage discharge circuit, the digital controller samples the voltage value on the energy storage capacitor, i.e., samples the charging voltage signal, and controls the discharge control signal by analyzing and calculating the charging voltage signal to realize the change of energy storage energy.

[0019] Optionally, in the variable-energy ignition circuit for aero-engines as described above,

[0020] The digital controller is connected to the filter circuit, the peak current sampling control circuit and the energy storage and discharge circuit via an electrical connector. The power supply line includes a positive power supply line and a negative power supply line, and the signal line includes a reference voltage signal line, a discharge control signal line and a charging voltage signal line.

[0021] In the variable energy ignition circuit, the digital controller is connected to the filter circuit through the power supply line, to the peak current sampling control circuit through the reference voltage signal line, and to the energy storage discharge circuit through the discharge control signal line and the charging voltage signal line, respectively.

[0022] The DC-AC inverter boost circuit is connected to the back-end energy storage and discharge circuit through the boost transformer T1, and the input coil of the boost transformer T1 is also connected to the peak current sampling control circuit.

[0023] Optionally, in the variable-energy ignition circuit for aero-engines as described above,

[0024] In the energy storage and discharge circuit, one end of one output coil of the boost transformer T1 is connected to the positive terminal of the silicon stack D4. The negative terminal of the silicon stack D4 is connected to one end of the energy storage capacitor C10, one end of the voltage divider resistor R13, and one end of the discharge tube V1. The other end of the discharge tube V1 is grounded through resistor R19 and connected to the output coil of the boost transformer T3. The other end of the energy storage capacitor C10 is connected to the other end of the output coil and grounded. One end of the other output coil is connected to diode D5 and resistor R11 in sequence. The rear end of resistor R11 is connected to one end of capacitor C11, the negative terminal of diode D6, and one end of the input coil of transformer T2. The positive terminal of diode D6 is connected to the other end of the input coil of transformer T2 and the positive terminal of the thyristor SCR2. The thyristor SCR2 is connected to the digital controller through the discharge control signal line, and the discharge control signal line is grounded through resistor R12. The negative terminal of R2 and the other end of resistor R11 are both grounded. One end of the output coil of transformer T2 is connected to the control terminal of SCR3. The positive terminal of SCR3 is connected to the other end of voltage divider resistor R13. The other end of voltage divider resistor R13 is connected in series with voltage divider resistors R14 to R18 and grounded through voltage divider resistor R18. The end of voltage divider resistor R18 connected to R17 is connected to the digital controller through the charging voltage signal line. The positive terminal of SCR3 is also connected to the negative terminal of diode D7 in series with diodes D7 to D9. The negative terminal of diode D7 is grounded through capacitor C12. The positive terminal of diode D7 is connected between voltage divider resistors R14 and R15. The positive terminal of diode D8 is connected between voltage divider resistors R15 and R16. The positive terminal of diode D9 is combined with the other end of the output coil of transformer T2 and connected to one end of the input coil of boost transformer T3. The other end of the input coil is grounded.

[0025] Optionally, in the variable-energy ignition circuit for aero-engines as described above,

[0026] In the variable energy ignition circuit, the input from the digital controller is first filtered by a filter circuit, and then converted into an AC pulse voltage signal by a DC-AC inverter circuit. This signal is then converted into a high-voltage AC signal by a step-up transformer T1. After rectification by silicon stack D4, a unidirectional high-voltage signal is generated to charge the energy storage capacitor C10. The other coil of the step-up transformer T1 is rectified by D5 to charge capacitor C11. The energy on capacitor C11 is used to trigger the thyristor SCR3.

[0027] By dividing the voltage through resistors R13 to R18, voltage sampling is performed on resistor R18 to obtain a charging voltage signal, which reflects the charging voltage on energy storage capacitor C10. After the charging voltage signal is fed back to the digital controller, the energy storage energy is calculated and analyzed based on the charging voltage signal in order to control the energy storage energy of the product.

[0028] The peak current sampling control circuit samples the peak current in the primary circuit of the step-up transformer T1 and converts it into a voltage signal. It also receives a reference voltage signal from the digital controller. By comparing the two voltage signals, it outputs a control signal to control the operating state of the DC-AC inverter circuit.

[0029] When the charging voltage signal detected by the digital controller meets the design requirements, the digital controller outputs a discharge control signal, which turns on the thyristor SCR2, and turns on the thyristor SCR3 through the transformer T2, forming a discharge circuit. The energy stored in the energy storage capacitor C10 is released through the discharge circuit.

[0030] The beneficial effects of the present invention are as follows: The present invention provides a variable energy ignition circuit for an aero-engine. The digital controller not only provides power to the variable energy ignition circuit, but also provides a reference voltage signal to the peak current sampling control circuit to control the peak current. In addition, the digital controller samples the voltage value on the energy storage capacitor in the energy storage discharge circuit to perform analysis and calculation of the charging voltage signal. When the calculated charging voltage signal reaches a predetermined value, the digital controller outputs a discharge control signal to the energy storage discharge circuit. The variable energy ignition circuit provided in this invention, on the one hand, collects the charging voltage signal on the energy storage capacitor in the energy storage and discharge circuit, and issues a discharge control signal by calculating and analyzing the charging voltage signal to control the discharge frequency, thereby realizing the change of energy storage under the controlled discharge frequency, and thus realizing the change of spark energy. This allows the engine to use a smaller spark energy when igniting at room temperature, and to increase the spark energy by increasing the energy storage energy in relatively harsh environments such as high altitude and low temperature, thereby better igniting the fuel-air mixture in the engine. On the other hand, by controlling the charging voltage and discharge frequency on the energy storage capacitor, the variable energy ignition circuit can be controlled to operate in a low spark energy state for a part of its entire life cycle, thereby improving the overall reliability and lifespan of the variable energy ignition circuit. Attached Figure Description

[0031] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0032] Figure 1 The diagram shown is a schematic of the existing ignition circuit of an aero-engine.

[0033] Figure 2 A circuit block diagram of a variable energy ignition circuit for an aero-engine provided in an embodiment of the present invention;

[0034] Figure 3 for Figure 2 The circuit diagram shown in the embodiment is a schematic diagram of the variable energy ignition circuit for an aero-engine.

[0035] Figure 4 A schematic diagram of the circuit structure of a variable energy ignition circuit for an aero-engine provided as an embodiment of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0037] The background section has already explained the function and design principle of the ignition circuit in an aero-engine. Since the energy storage is basically a fixed value and is usually designed to meet the maximum requirements of extreme normal operating conditions, the ignition system operates at maximum requirements throughout its entire life cycle, thereby increasing the load on the engine during normal operation and having a certain impact on the life of the ignition nozzle.

[0038] like Figure 1 The diagram shows a schematic of an existing ignition circuit for an aero-engine. After the ignition power is switched on, the power signal is filtered by a filter and sent to the subsequent DC-AC inverter circuit. The voltage signal is boosted by the step-up transformer T1 and then rectified by the D1 rectifier silicon stack to charge the energy storage capacitor C1. When the voltage across the energy storage capacitor C1 reaches the breakdown voltage of the discharge tube V1, the discharge tube V1 breaks down and conducts. The electrical energy stored in the energy storage capacitor C1 is boosted by the secondary step-up transformer T2 and released at the discharge terminal of the ignition nozzle to form an electric spark. Figure 1 The specific drawbacks of the existing ignition circuit shown are: the energy storage is a fixed value and is designed according to the energy storage required under the extreme conditions of the engine's operating envelope, which cannot realize the change of energy storage under different operating conditions, resulting in power waste.

[0039] To address the aforementioned issues, this invention provides a variable energy ignition circuit for aero-engines. By acquiring the charging voltage signal on the energy storage capacitor in the energy storage and discharge circuit, and by calculating and analyzing the charging voltage signal, a discharge control signal is issued to control the discharge frequency. This allows for changes in the stored energy under controlled discharge frequency, thereby changing the spark energy. This enables the engine to use less spark energy when igniting at room temperature, and to increase spark energy in relatively harsh environments such as high altitudes and low temperatures by increasing the stored energy, thus enabling better ignition of the fuel-air mixture inside the engine.

[0040] The present invention provides the following specific embodiments, which can be combined with each other. For the same or similar concepts or processes, they may not be described again in some embodiments.

[0041] Figure 2 This is a circuit block diagram of a variable-energy ignition circuit for an aero-engine, provided as an embodiment of the present invention. (See diagram below.) Figure 2 As shown, the main structure of the variable energy ignition circuit for aero-engines provided in this embodiment of the invention includes: a filter circuit, a DC-AC inverter boost circuit, a peak current sampling control circuit, and an energy storage and discharge circuit.

[0042] like Figure 2 As shown, the filter circuit, DC-AC inverter boost circuit, and energy storage discharge circuit are connected in sequence. The input terminal of the filter circuit is connected to the digital controller, which is used to provide power to the variable energy ignition circuit through the digital controller.

[0043] In this embodiment of the invention, the peak current sampling control circuit is connected to the DC-AC inverter boost circuit and the digital controller, respectively, and the energy storage discharge circuit is also connected to the digital controller.

[0044] Based on the circuit configuration of the variable ignition circuit provided in the above embodiments of the present invention, the digital controller provides power to the variable ignition circuit and also provides a reference voltage signal to the peak current sampling control circuit so as to control the peak current through the peak current sampling control circuit.

[0045] In addition, in this embodiment of the invention, the digital controller samples the voltage value on the energy storage capacitor in the energy storage discharge circuit to perform analysis and calculation of the charging voltage signal. When the calculated charging voltage signal reaches a predetermined value, the digital controller outputs a discharge control signal to the energy storage discharge circuit, so that the variable energy ignition circuit outputs a high-voltage pulse signal, thereby realizing the control of the discharge frequency.

[0046] In this embodiment of the invention, the filtering circuit bidirectionally suppresses input power supply noise and interference signals generated by the operation of the variable ignition circuit, ensuring that the variable ignition circuit operates normally and does not interfere with the power supply.

[0047] In this embodiment of the invention, the DC-AC inverter boost circuit is a self-excited DC-AC inverter boost circuit, which functions to convert the input low-voltage DC power into high-voltage AC pulse power.

[0048] In this embodiment of the invention, the peak current sampling control circuit is used to sample the peak current of the DC-AC inverter boost circuit, convert the collected peak current signal into a voltage signal, compare it with the reference voltage signal output by the digital controller, and output a high-level signal when the sampled voltage signal is higher than the reference voltage signal; the DC-AC inverter boost circuit is controlled by the high-level signal, the DC-AC inverter boost circuit stops working when the level is high, and the DC-AC inverter boost circuit works normally when the level is low.

[0049] In this embodiment of the invention, the energy storage and discharge circuit is used to convert the AC pulse power output by the DC-AC inverter boost circuit into high-voltage DC power and store it in the energy storage capacitor. When the voltage across the energy storage capacitor reaches the set discharge voltage, the discharge switch is turned on and a high-voltage signal is output.

[0050] The following is about Figure 2 The signals related to the digital controller are explained below:

[0051] (1) Reference voltage signal: The voltage signal output by the digital controller is used to control the peak current value of the DC-AC inverter boost circuit.

[0052] (2) Discharge control signal: The voltage signal output by the digital controller is used to control the conduction of the energy storage discharge circuit, thereby controlling the discharge frequency.

[0053] (3) Charging voltage signal: By adding a sampling resistor across the energy storage capacitor in the energy storage discharge circuit, the voltage value on the energy storage capacitor is sampled so that the energy storage energy can be changed by controlling the discharge control signal.

[0054] In one implementation of this invention, based on Figure 2 As shown in the circuit block diagram, each circuit has a specific function. Figure 3 As shown, Figure 2 The illustrated embodiment provides a schematic diagram of the variable energy ignition circuit for an aero-engine. The digital controller is connected to a filter circuit, a peak current sampling control circuit, and an energy storage and discharge circuit via electrical connectors. The power supply lines include positive and negative terminals, and the signal lines include a reference voltage signal line, a discharge control signal line, and a charging voltage signal line. In this variable energy ignition circuit, the digital controller is connected to the filter circuit via the power supply lines, to the peak current sampling control circuit via the reference voltage signal line, and to the energy storage and discharge circuit via the discharge control signal line and the charging voltage signal line, respectively. Additionally, the DC-AC inverter boost circuit is connected to the downstream energy storage and discharge circuit via a boost transformer T1, and the input coil of the boost transformer T1 is also connected to the peak current sampling control circuit.

[0055] In the energy storage and discharge circuit, one end of one output coil of the step-up transformer T1 is connected to the positive terminal of the silicon stack D4. The negative terminal of the silicon stack D4 is connected to one end of the energy storage capacitor C10, one end of the voltage divider resistor R13, and one end of the discharge tube V1. The other end of the discharge tube V1 is grounded through resistor R19 and connected to the output coil of the step-up transformer T3. The other end of the energy storage capacitor C10 is connected to the other end of the same output coil and grounded. One end of the other output coil is connected to diode D5 and resistor R11 in sequence. The rear end of resistor R11 is connected to one end of capacitor C11, the negative terminal of diode D6, and one end of the input coil of transformer T2. The positive terminal of diode D6 is connected to the other end of the input coil of transformer T2 and the positive terminal of the thyristor SCR2. The thyristor SCR2 is connected to the digital controller through the discharge control signal line, and the discharge control signal line is grounded through resistor R12. The negative terminal of R2 and the other end of resistor R11 are both grounded. One end of the output coil of transformer T2 is connected to the control terminal of SCR3. The positive terminal of SCR3 is connected to the other end of voltage divider resistor R13. The other end of voltage divider resistor R13 is connected in series with voltage divider resistors R14 to R18 and grounded through voltage divider resistor R18. The end of voltage divider resistor R18 connected to R17 is connected to the digital controller through the charging voltage signal line. The positive terminal of SCR3 is also connected to the negative terminal of diode D7 in series with diodes D7 to D9. The negative terminal of diode D7 is grounded through capacitor C12. The positive terminal of diode D7 is connected between voltage divider resistors R14 and R15. The positive terminal of diode D8 is connected between voltage divider resistors R15 and R16. The positive terminal of diode D9 is combined with the other end of the output coil of transformer T2 and connected to one end of the input coil of boost transformer T3. The other end of the input coil is grounded.

[0056] After the power input, it first passes through a filter circuit, then through a DC-AC inverter circuit to convert low-voltage DC power into AC pulse voltage signals. This is then converted into high-voltage AC power by a step-up transformer T1. After rectification by silicon stack D4, a unidirectional high-voltage signal is generated to charge energy storage capacitor C10. Simultaneously, another coil of step-up transformer T1, after rectification by D5, charges capacitor C11. The energy in capacitor C11 is used to trigger the thyristor SCR3. Through voltage division by resistors R13 to R18, the charging voltage signal line is connected to resistor R18 for voltage sampling. The voltage signal, specifically the charging voltage signal, reflects the charging voltage on the energy storage capacitor C10. This charging voltage signal is fed back to the digital controller, which analyzes and calculates the stored energy to control the product's energy storage capacity. The peak current sampling control circuit samples the peak current in the primary circuit of the step-up transformer T1 and converts it into a voltage signal. Simultaneously, it receives a reference voltage signal from the digital controller. By comparing the two voltage signals, a control signal is output to control the operating state (operational / non-operational) of the DC-AC inverter circuit. When the charging voltage signal detected by the digital controller meets the design requirements, the digital controller outputs a discharge control signal, turning on the thyristor SCR2. This, in turn, turns on the thyristor SCR3 through the transformer T2, forming a discharge circuit. The energy stored in the energy storage capacitor C10 is released through this discharge circuit.

[0057] The variable energy ignition circuit for aero-engines provided in this embodiment of the invention not only provides power to the variable energy ignition circuit, but also provides a reference voltage signal to the peak current sampling control circuit to control the peak current. In addition, the digital controller samples the voltage value on the energy storage capacitor in the energy storage discharge circuit to perform analysis and calculation of the charging voltage signal. When the calculated charging voltage signal reaches a predetermined value, the digital controller outputs a discharge control signal to the energy storage discharge circuit. The variable energy ignition circuit provided in this invention, on the one hand, collects the charging voltage signal on the energy storage capacitor in the energy storage and discharge circuit, and issues a discharge control signal by calculating and analyzing the charging voltage signal to control the discharge frequency, thereby realizing the change of energy storage under the controlled discharge frequency, and thus realizing the change of spark energy. This allows the engine to use a smaller spark energy when igniting at room temperature, and to increase the spark energy by increasing the energy storage energy in relatively harsh environments such as high altitude and low temperature, thereby better igniting the fuel-air mixture in the engine. On the other hand, by controlling the charging voltage and discharge frequency on the energy storage capacitor, the variable energy ignition circuit can be controlled to operate in a low spark energy state for a part of its entire life cycle, thereby improving the overall reliability and lifespan of the variable energy ignition circuit.

[0058] The following implementation example illustrates the effectiveness of the variable-energy ignition circuit for aero-engines provided by the embodiments of the present invention:

[0059] Implementation Cases

[0060] like Figure 4 The diagram shown is a schematic representation of the circuit structure of a variable-energy ignition circuit for an aero-engine, provided in an embodiment of the present invention. Figure 4 As shown, in this implementation example, the DC-AC inverter circuit uses a self-excited switching circuit. After the power signal is filtered, one path connects to the primary coil of the step-up transformer T1, and the other path is regulated by a 7815 three-terminal regulator to output a 15V voltage. This voltage serves as a reference power supply to power integrated circuits such as the JB555 timer circuit and the LM139 voltage comparator. A 20kHz square wave signal is generated by the JB555 timer circuit and its peripheral circuits, which controls the periodic on and off of the MOSFET Q1. The peak current sampling control circuit consists of resistors R7, R8, and R10, capacitor C9, the LM139 voltage comparator, diode D3, and SCR1. Resistor R10 is connected in series in the primary circuit of the step-up transformer T1. The current signal in the primary circuit forms a voltage across R10 after passing through it. The voltage signal reflects the peak current in the primary circuit. This voltage signal is compared with the reference voltage signal output by the digital controller. When the voltage signal is higher than the reference voltage, the LM139 voltage comparator outputs a high-level signal, which turns on the SCR1. The output signal of the JB555 timer circuit forms a loop through the SCR1. The input voltage between the gate and source of the MOS field-effect transistor Q1 is zero, so Q1 is turned off, the primary circuit is turned off, and the voltage across resistor R10 is zero. The LM139 voltage comparator outputs a low-level signal, the SCR1 is turned off, and the voltage signal output by the JB555 timer circuit is applied between the gate and source of Q1. Q1 turns on, the primary circuit conducts, and current is generated, forming a voltage signal across resistor R10. Through this circuit, a controllable DC-AC inverter boost circuit is formed.

[0061] While the embodiments disclosed in this invention are as described above, they are merely illustrative of the embodiments to facilitate understanding of the invention and are not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A variable-energy ignition circuit for an aircraft engine, characterized in that, include: Digital controller, filter circuit, DC-AC inverter boost circuit, peak current sampling control circuit and energy storage discharge circuit; The filter circuit, DC-AC inverter boost circuit, and energy storage discharge circuit are connected in sequence, and the input terminal of the filter circuit is connected to the digital controller. The variable energy ignition circuit is used to provide power to the variable energy ignition circuit through a digital controller, and to send a reference voltage signal to the peak current sampling control circuit through the digital controller, so as to control the peak current of the DC-AC inverter boost circuit through the peak current sampling control circuit. The variable energy ignition circuit is also used to sample the voltage value on the energy storage capacitor in the energy storage discharge circuit through the digital controller to perform analysis and calculation of the charging voltage signal. When the calculated charging voltage signal reaches a predetermined value, the digital controller outputs a discharge control signal to the energy storage discharge circuit to control the energy storage discharge circuit to conduct and output a high voltage pulse signal. The DC-AC inverter boost circuit is connected to the back-end energy storage and discharge circuit through the boost transformer T1, and the input coil of the boost transformer T1 is also connected to the peak current sampling and control circuit. In the energy storage and discharge circuit, one end of one output coil of the step-up transformer T1 is connected to the positive terminal of the silicon stack D4. The negative terminal of the silicon stack D4 is connected to one end of the energy storage capacitor C10, one end of the voltage divider resistor R13, and one end of the discharge tube V1. The other end of the discharge tube V1 is grounded through resistor R19 and connected to the output coil of the step-up transformer T3. The other end of the energy storage capacitor C10 is connected to the other end of the aforementioned output coil and grounded. One end of the other output coil of the step-up transformer T1 is connected in sequence to diode D5 and resistor R11. The rear end of resistor R11 is connected to one end of capacitor C11, the negative terminal of diode D6, and one end of the input coil of transformer T2. The positive terminal of diode D6 is connected to the other end of the input coil of transformer T2 and the positive terminal of the thyristor SCR2. The thyristor SCR2 is connected to the digital controller through a discharge control signal line, and the discharge control signal line is connected through resistor R12. The SCR2 is grounded, and the negative terminal of the SCR2 is grounded. One end of the output coil of the transformer T2 is connected to the control terminal of the SCR3. The positive terminal of the SCR3 is connected to the other end of the voltage divider resistor R13. The other end of the voltage divider resistor R13 is connected in series with voltage divider resistors R14 to R18 and grounded through voltage divider resistor R18. The end of voltage divider resistor R18 connected to R17 is connected to the digital controller through the charging voltage signal line. The positive terminal of the SCR3 is also connected to the negative terminal of diode D7 in series with diodes D7 to D9. The negative terminal of diode D7 is grounded through capacitor C12. The positive terminal of diode D7 is connected between voltage divider resistors R14 and R15. The positive terminal of diode D8 is connected between voltage divider resistors R15 and R16. The positive terminal of diode D9 is combined with the other end of the output coil of transformer T2 and then connected to one end of the input coil of boost transformer T3. The other end of the input coil of boost transformer T3 is grounded.

2. The variable-energy ignition circuit for an aero-engine according to claim 1, characterized in that, The filtering circuit is used to suppress input power noise and interference signals generated by the operation of the variable ignition circuit in both directions, ensuring that the variable ignition circuit works normally and does not interfere with the power supply. The DC-AC inverter boost circuit is a self-excited DC-AC inverter boost circuit, used to convert the input low-voltage DC power into high-voltage AC pulse power.

3. The variable-energy ignition circuit for an aero-engine according to claim 1, characterized in that, The peak current sampling control circuit is used to sample the peak current of the DC-AC inverter boost circuit and convert the collected peak current signal into a voltage signal, which is compared with the reference voltage signal output by the digital controller. When the sampled voltage signal is higher than the reference voltage signal, a high-level signal is output. The high-level signal controls the DC-AC inverter boost circuit. When the signal is high, the DC-AC inverter boost circuit stops working; when the signal is low, the DC-AC inverter boost circuit works normally.

4. The variable-energy ignition circuit for an aero-engine according to claim 1, characterized in that, The energy storage and discharge circuit is used to convert the AC pulse power output by the DC-AC inverter boost circuit into high-voltage DC power and store it in the energy storage capacitor. When the voltage across the energy storage capacitor reaches the set discharge voltage, the discharge switch is turned on and a high-voltage signal is output.

5. The variable-energy ignition circuit for an aero-engine according to claim 4, characterized in that, By adding a sampling resistor across the energy storage capacitor in the energy storage discharge circuit, the digital controller samples the voltage value on the energy storage capacitor, i.e., samples the charging voltage signal, and controls the discharge control signal by analyzing and calculating the charging voltage signal to realize the change of energy storage energy.

6. The variable-energy ignition circuit for an aero-engine according to any one of claims 1 to 5, characterized in that, The digital controller is connected to the filter circuit, the peak current sampling control circuit and the energy storage and discharge circuit via an electrical connector. The power supply line includes a positive power supply line and a negative power supply line, and the signal line includes a reference voltage signal line, a discharge control signal line and a charging voltage signal line. In the variable energy ignition circuit, the digital controller is connected to the filter circuit via the power supply line, to the peak current sampling control circuit via the reference voltage signal line, and to the energy storage discharge circuit via the discharge control signal line and the charging voltage signal line, respectively.

7. The variable-energy ignition circuit for an aero-engine according to any one of claims 1 to 5, characterized in that, In the variable energy ignition circuit, after the power input, it first passes through a filter circuit, and then through a DC-AC inverter boost circuit to convert the low-voltage DC power into an AC pulse voltage signal. This signal is then converted into high-voltage AC power by a boost transformer T1. After rectification by silicon stack D4, a unidirectional high-voltage signal is formed to charge the energy storage capacitor C10. The other coil of the boost transformer T1 is rectified by diode D5 to charge capacitor C11. The energy on capacitor C11 is used to trigger the thyristor SCR3. By dividing the voltage through resistors R13 to R18, voltage sampling is performed on resistor R18 to obtain a charging voltage signal, which reflects the charging voltage on energy storage capacitor C10. After the charging voltage signal is fed back to the digital controller, the stored energy is calculated and analyzed based on the charging voltage signal in order to control the stored energy. The peak current sampling control circuit samples the peak current in the primary circuit of the step-up transformer T1 and converts it into a voltage signal. It also receives a reference voltage signal from the digital controller. By comparing the two voltage signals, it outputs a control signal to control the working state of the DC-AC inverter step-up circuit. When the charging voltage signal detected by the digital controller meets the design requirements, the digital controller outputs a discharge control signal, which turns on the thyristor SCR2, and turns on the thyristor SCR3 through the transformer T2, forming a discharge circuit. The energy stored in the energy storage capacitor C10 is released through the discharge circuit.

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