CN108678920B - Ignition circuit and solid ablation pulsed electric thruster - Google Patents

Abstract

The invention discloses an ignition circuit and a solid ablation pulse type electric thruster, wherein the ignition circuit comprises an ignition voltage regulation module, an energy storage module, an isolation module and a drive module; the ignition voltage regulation module is used for charging the energy storage module; The energy storage module is used to store electric energy; the isolation module is used to receive the ignition trigger signal, and output to the drive module after isolation; the drive module, according to the isolated ignition trigger signal, releases the electric energy in the energy storage module to ignite the spark plug. The technical scheme of the present invention realizes the effective control of the timing of ignition charging and discharging by setting the first transistor and the second transistor to isolate the spark plug from the energy storage module, and controlling the turn-on and turn-off of the first transistor and the second transistor. , to avoid the direct discharge of the energy storage module caused by carbon deposition on the spark plug, and prolong the service life of the ignition system.

Description

Ignition circuit and solid ablation pulsed electric thruster

technical field

The invention relates to the technical field of electric propulsion, in particular to an ignition circuit and a solid ablation pulsed electric thruster.

Background technique

The solid ablation pulse electric thruster uses a capacitor and other energy storage devices to pulse discharge to generate an arc. Under the action of the arc, the working medium of the thruster is ablated and ionized, and the ablation and ionization products are accelerated by the Lorentz force and aerodynamic force in the discharge channel. A thruster that produces thrust. One of the typical thrusters, Pulsed Plasma Thruster (PPT), has been widely used in microsatellites for missions such as microsatellite orbit maintenance, constellation site maintenance, and drag compensation.

Limited by the power of the star power supply, this kind of thruster mostly adopts the induction excitation method to generate discharge between the thruster plates, and the spark plug provides a "plasma source" for the main discharge of the induced thruster. Both the spark plug discharge and the thruster main discharge will produce strong electromagnetic interference. The existing spark plug ignition circuit has a weak anti-interference ability, and after the thruster works for a long time, the spark plug cathode and anode plates will be short-circuited due to the formation of carbon deposits on the surface of the semiconductor ring. , causing the electric energy of the ignition energy storage device to discharge, and the spark plug cannot be ignited, resulting in the failure of the thruster.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide an ignition circuit, which aims to improve the anti-interference performance and reliability of the ignition circuit.

In order to achieve the above purpose, the ignition circuit proposed by the present invention includes an ignition voltage regulation module, an energy storage module and a drive module; wherein,

the ignition voltage adjustment module for charging the energy storage module;

the energy storage module for storing electrical energy;

The isolation module is used to receive the ignition trigger signal, and output to the drive module after isolation;

The drive module releases the electrical energy in the energy storage module to ignite the spark plug according to the isolated ignition trigger signal.

Preferably, the ignition circuit further includes an isolation module, and the isolation module is configured to receive an ignition trigger signal, and output it to the drive module after isolation.

Preferably, the driving module includes a first transistor, a second transistor, a first diode, a second diode, a transformer and a resonant capacitor; the gate of the first transistor is connected to the isolation module, and the The source of the first transistor is grounded, the drain of the first transistor is connected to the anode of the first diode, and the cathode of the first diode is connected to the energy storage module; the second transistor The gate of the second transistor is connected to the isolation module, the source of the second transistor is connected to the anode of the second diode, the cathode of the second diode is connected to the spark plug, and the second diode is connected to the spark plug. The cathode of the pole tube is also connected to the first end of the secondary coil of the transformer; the first end of the primary coil of the transformer is connected to the cathode of the first diode, and the second end of the primary coil of the transformer is connected to the The anode of the first diode is connected; the second end of the secondary coil of the transformer is grounded through the resonance capacitor.

Preferably, the driving module further includes a voltage regulator tube, the anode of the voltage regulator tube is grounded, and the cathode of the voltage regulator tube is connected to the source electrode of the second transistor.

Preferably, the isolation module includes an optocoupler isolation chip, and the optocoupler isolation chip includes a first signal terminal, a first ground terminal, a second signal terminal, a second ground terminal, a first output terminal, a second output terminal, a first a power input terminal, a first power ground terminal, a second power input terminal, and a second power ground terminal; the first signal terminal is connected to the second signal terminal, and the first ground terminal is connected to the second ground terminal The first power input terminal is connected to the first DC power supply, and the ground terminal of the first power supply is floating and grounded; the second power input terminal is connected to the second DC power supply, and the ground terminal of the second power supply is grounded; the The first output terminal is connected to the driving module, and the second output terminal is connected to the driving module.

Preferably, the ignition voltage adjustment module includes a PWM controller, a third transistor, a first resistor and a first inductor; the control end of the PWM controller is connected to the gate of the third transistor, and the third transistor The drain of the transistor is connected to the first end of the first inductor, the second end of the first inductor is connected to the third DC power supply, and the emitter of the third transistor is connected to the first end of the first resistor , the second end of the first resistor is grounded.

Preferably, the PWM controller further includes a current feedback terminal, and the current feedback terminal of the PWM controller is connected to the first terminal of the first resistor;

The PWM controller detects the current flowing through the third transistor, compares the current with a preset current threshold, and when the detected current is greater than the preset current threshold, the PWM controller turns off the third transistor .

Preferably, the ignition voltage adjustment module further includes a third diode, the anode of the third diode is connected to the first end of the first inductor, and the cathode of the third diode is connected to the first end of the first inductor. The input terminal of the energy storage module is connected.

Preferably, the ignition voltage adjustment module further includes a first capacitor, a first end of the first capacitor is connected to the cathode of the third diode, and a second end of the first capacitor is grounded.

Preferably, the ignition voltage adjustment module further includes a second resistor and a third resistor, the PWM controller includes a voltage feedback end, and the first end of the second resistor is connected to the cathode of the third diode, The second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is grounded; the first end of the third resistor is also connected to the voltage of the PWM controller Feedback connection;

The PWM controller detects the voltage output to the energy storage module, and the PWM controller adjusts the duty ratio of the control signal output to the third transistor according to the detected voltage.

Preferably, the energy storage module includes a fourth resistor, a fifth resistor, a second capacitor and a third capacitor; the first end of the fourth resistor is connected to the output end of the ignition voltage adjustment module, and the fourth resistor The second end of the resistor is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the first input end of the driving module; the first end of the second capacitor is connected to the The second end of the fourth resistor is connected, the second end of the second capacitor is grounded; the first end of the third capacitor is connected to the second end of the fifth resistor, and the second end of the third capacitor grounded, and the first end of the second capacitor is also connected to the second input end of the driving module.

In order to achieve the above object, the present invention also proposes a solid ablation pulsed electric thruster, the solid ablation pulsed electric thruster includes the above ignition circuit. The ignition circuit includes an ignition voltage regulation module, an energy storage module, an isolation module and a drive module; wherein the ignition voltage regulation module is used to charge the energy storage module; the energy storage module is used to store electrical energy; The isolation module is used for receiving the ignition trigger signal, and output to the drive module after isolation; the drive module releases the electric energy in the energy storage module according to the isolated ignition trigger signal.

The technical scheme of the present invention forms an ignition circuit by arranging an ignition voltage regulating module, an energy storage module and a driving module. The drive module isolates the spark plug from the energy storage module by setting the first transistor and the second transistor, and controls the turn-on and turn-off of the first transistor and the second transistor to effectively control the timing of ignition charging and discharging to avoid spark plugs. The energy storage module is directly discharged due to carbon deposition, which prolongs the service life of the ignition system.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.

1 is a functional block diagram of an embodiment of an ignition circuit of the present invention;

FIG. 2 is a schematic diagram of a circuit structure of an ignition circuit according to an embodiment of the present invention.

Description of reference numbers:

label name label name 100 Ignition Voltage Regulation Module Cs Resonant capacitor 200 Energy storage module T transformer 300 isolation module Q1～Q3 first to third transistors 400 drive module H spark plug 500 spark plug L1 first inductance R1～R5 The first resistor to the fifth resistor U2 PWM C1～C3 The first capacitor to the third capacitor ZD1 Zener tube U1 Isolated power chip D1～D3 first diode to third diode VCC1 first DC power supply VCC3 third DC power supply VCC2 second DC power supply

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and should not be understood as indicating or implying their relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exists, and it is not within the protection scope of the present invention.

The present invention provides an ignition circuit.

Referring to FIG. 1 , in an embodiment of the present invention, the ignition circuit includes an ignition voltage adjustment module 100 , an energy storage module 200 , an isolation module 300 and a drive module 400 .

The ignition voltage adjustment module 100 is used for charging the energy storage module 200 . The ignition adjustment module is connected to a satellite bus power supply (ie, the second DC power supply VCC2 and the third DC power supply VCC3 hereinafter), and the energy storage module 200 is charged after adjusting the output voltage of the satellite bus power supply.

The energy storage module 200 is used to store electrical energy. The energy storage module 200 uses capacitive elements to store energy, and stores the electrical energy input by the ignition voltage adjustment module 100 . Under the control of the ignition trigger signal, the energy storage module 200 discharges through the spark plug 500 .

The isolation module 300 is configured to receive the ignition trigger signal, and output the signal to the drive module 400 after isolation. The isolation module 300 can be isolated by using existing isolation means such as optocoupler isolation and isolation amplifiers.

The drive module 400 releases the electrical energy in the energy storage module 200 to ignite the spark plug according to the isolated ignition trigger signal. The driving module 400 is directly connected to the spark plug 500, and through the driving module 400, the electric energy of the energy storage module 200 is released to the spark plug 500, thereby discharging.

The technical solution of the present invention forms an ignition circuit by arranging an ignition voltage adjustment module 100 , an energy storage module 200 , an isolation module 300 and a drive module 400 . The ignition trigger signal output by the controller is isolated by the isolation module 300 and then output to the driving module 400. The controller is on the weak current side, and the driving module 400 is on the strong current side, thereby realizing the isolation of the weak current side and the strong current side. Avoid the interference of the strong electricity side to the weak electricity, thereby improving the anti-interference performance of the ignition circuit.

2, specifically, the driving module includes a first transistor Q1, a second transistor Q2, a first diode D1, a second diode D2, a transformer T and a resonant capacitor Cs; The gate is connected to the isolation module 300, the source of the first transistor Q1 is grounded, the drain of the first transistor Q1 is connected to the anode of the first diode D1, and the first diode The cathode of D1 is connected to the energy storage module 200; the gate of the second transistor Q2 is connected to the isolation module 300, and the source of the second transistor Q2 is connected to the anode of the second diode D2 , the cathode of the second diode D2 is connected to the spark plug H (ie the spark plug 500 in FIG. 1 ), and the cathode of the second diode D2 is also connected to the first end of the secondary coil of the transformer T connection; the first end of the primary coil of the transformer T is connected to the cathode of the first diode D1, and the second end of the primary coil of the transformer T is connected to the anode of the first diode D1; the The second end of the secondary coil of the transformer T is grounded through the resonant capacitor Cs.

Further, the driving module further includes a voltage regulator tube ZD1, the anode of the voltage regulator tube ZD1 is grounded, and the cathode of the voltage regulator tube ZD1 is connected to the source electrode of the second transistor Q2, and its function is to prevent the source of the second transistor Q2 from being damaged. A large voltage occurs at the pole to avoid damage to the second transistor Q2.

In this embodiment, both the first transistor Q1 and the second transistor Q2 are IGBTs. The first diode D1 functions to clamp the drain voltage of the first transistor Q1 and release the leakage inductance energy of the transformer T, and the second diode D2 functions to prevent the reverse current in the circuit loop. The transformer T boosts the voltage across the first diode D1 and outputs it to the spark plug, so that the voltage across the spark plug reaches the on-voltage of the spark plug to generate discharge.

It should be noted that carbon deposits will be formed on the surface of the semiconductor ring after the spark plug is used for a long time, and the spark plug is easily short-circuited, resulting in direct discharge after the spark plug is energized. The drive module sets the first transistor Q1 and the second transistor The energy modules 200 are isolated to avoid direct discharge of the energy storage module 200 caused by carbon deposition on the spark plug H, resulting in that the energy storage module 200 cannot be charged and the spark plug H cannot be ignited. The drive module 400 extends the life of the ignition system.

In addition, the driving module 400 boosts the voltage across the first diode D1 through the transformer T and outputs it to the spark plug H, which reduces the voltage level in the energy storage module 200 and realizes the spark plug at a lower DC charging voltage. H discharge. The high-voltage, low-current and low-voltage, high-current composite discharge method fully improves the efficiency of charging energy use, and can effectively remove carbon deposits on the surface of the spark plug H.

The driving module 400 receives the ignition trigger signal, controls the turn-on and turn-off of the first transistor Q1 and the second transistor Q2, and realizes effective control of the charging and discharging timing of the ignition charging battery.

The gates of the first transistor Q1 and the second transistor Q2 are both connected to the isolation module 300. When receiving the ignition trigger signal output by the isolation module 300, the first transistor Q1 and the second transistor Q2 are both turned on, and two energy sources are formed at this time. The channel is passed to the spark plug. One path flows into the spark plug after passing through the transformer T, and the other path flows into the spark plug after passing through the second transistor Q2 and the second diode D2.

Specifically, the isolation module 300 includes an optocoupler isolation chip, and the optocoupler isolation chip includes a first signal terminal IN1, a first ground terminal OUT1, a second signal terminal IN2, a second ground terminal OUT2, a first output terminal Vo1, a first Two output terminals Vo2, a first power input terminal VCC, a first power ground terminal VEE, a second power input terminal VCC, and a second power ground terminal VEE; the first signal terminal IN1 is connected to the second signal terminal IN2, The first ground terminal OUT1 is connected to the second ground terminal OUT2; the first power supply input terminal VCC is connected to the first DC power supply VCC1, and the first power supply ground terminal VEE is floating and grounded; the second power supply input terminal The VCC is connected to the second DC power supply VCC2 , and the ground terminal VEE of the second power supply is grounded; the first output terminal is connected to the driving module 400 , and the second output terminal is connected to the driving module 400 .

In this embodiment, the model used for the optocoupler isolation chip is HCPL-315J. The first signal terminal IN1 and the first ground terminal OUT1, and the second signal terminal IN2 and the second ground terminal OUT2 are used for receiving the ignition trigger signal output by the satellite main controller. The optocoupler isolation chip of the HCPL-315J type includes two optocouplers, so that one ignition trigger signal is divided into two paths to drive the first transistor Q1 and the second transistor Q2 respectively.

Specifically, the ignition voltage adjustment module 100 includes a PWM controller U2, a third transistor Q3, a first resistor R1 and a first inductor L1; the control terminal of the PWM controller U2 and the gate of the third transistor Q3 connection, the drain of the third transistor Q3 is connected to the first end of the first inductor L1, the second end of the first inductor L1 is connected to the third DC power supply VCC3, the emission of the third transistor Q3 The pole is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is grounded.

It should be noted that the first inductor L1 is a boost inductor. The PWM controller U2 outputs a PWM wave with a certain duty cycle, and controls the third transistor Q3 to be turned on and off periodically, thereby boosting the energy of the third DC power supply to charge the energy storage module 200 .

Further, the PWM controller U2 further includes a current feedback terminal, and the current feedback terminal of the PWM controller U2 is connected to the first terminal of the first resistor R1.

The PWM controller U2 detects the current flowing through the third transistor Q3, compares the current with a preset current threshold, and when the detected current is greater than the preset current threshold, the PWM controller U2 turns off the current. The third transistor Q3. When the current flowing in the third transistor Q3 is too large, the components in the circuit are prevented from being damaged, and the PWM controller U2 stops outputting PWM waves, thereby improving the reliability and safety of the ignition voltage regulating module 100 .

Further, the ignition voltage adjustment module 100 further includes a third diode D3, the anode of the third diode D3 is connected to the first end of the first inductor L1, and the third diode D3 The cathode is connected to the input end of the energy storage module 200 . The third diode D3 prevents the voltage in the energy storage module 200 from entering the third DC power source VCC3 in reverse series.

Further, the ignition voltage adjustment module 100 further includes a first capacitor C1, the first end of the first capacitor C1 is connected to the cathode of the third diode D3, and the second end of the first capacitor is grounded .

The function of the first capacitor C1 is to filter and stabilize the voltage output from the third DC power source VCC3 to the energy storage module 200 , thereby effectively improving the charging voltage stability of the ignition energy storage module 200 .

Further, the ignition voltage adjustment module 100 further includes a second resistor R2 and a third resistor R3, the PWM controller U2 includes a voltage feedback terminal, and the first terminal of the second resistor R2 is connected to the third diode. The cathode of the tube D3 is connected, the second end of the second resistor R2 is connected to the first end of the third resistor R3, the second end of the third resistor R3 is grounded; the first end of the third resistor R3 The terminal is also connected with the voltage feedback terminal of the PWM controller U2;

The PWM controller U2 detects the voltage output to the energy storage module 200, and the PWM controller U2 adjusts the duty ratio of the control signal output to the third transistor Q3 according to the detected voltage.

It should be noted that when the PWM controller U2 detects that the voltage across the third resistor R3 is high, it reduces the duty cycle of the control signal to lower the voltage output from the ignition voltage adjustment module 100 to the energy storage module 200; when When the PWM controller U2 detects that the voltage across the third resistor R3 is low, it increases the duty cycle of the control signal to increase the voltage output from the ignition voltage adjustment module 100 to the energy storage module 200 . In this way, the charging voltage stability of the ignition energy storage module 200 is further improved.

Specifically, the energy storage module 200 includes a fourth resistor R4, a fifth resistor R5, a second capacitor C2 and a third capacitor C3; the first end of the fourth resistor R4 and the output of the ignition voltage adjustment module 100 The second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected to the first input end of the driving module 400; The first end of the second capacitor C2 is connected to the second end of the fourth resistor R4, the second end of the second capacitor C2 is grounded; the first end of the third capacitor C3 is connected to the fifth resistor The second terminal of R5 is connected, the second terminal of the third capacitor C3 is grounded, and the first terminal of the second capacitor C2 is also connected to the second input terminal of the driving module 400 .

The fourth resistor R4 and the fifth resistor R5 are both current limiting resistors, and the second capacitor C2 and the third capacitor C3 are both used for storing electrical energy.

Based on the above technical solutions, the present invention can at least achieve the following effects:

The present invention has a feedback regulation voltage regulation module, which can effectively improve the charging voltage stability of the ignition energy storage capacitor and realize the isolation of high and low voltage circuits by cooperating with filtering and high-voltage isolation settings.

The invention realizes complete isolation of ignition triggering control and charging and discharging circuit, avoids the damage of ignition triggering control low-voltage circuit components caused by high voltage of ignition and discharge, improves the anti-interference ability of the ignition system and reduces the false triggering rate of the system.

The invention realizes the effective control of the charging and discharging timing of the ignition charging battery, so that the spark plug can be ignited by high-frequency discharge, which provides a necessary condition for the high-frequency discharge operation of the thruster; Effectively improve the reliability of circuit components in a strong electromagnetic environment.

In the present invention, the driving module boosts the voltage across the first diode D1 through the transformer T and outputs it to the spark plug, which reduces the voltage level in the energy storage module and realizes the discharge of the spark plug at a lower DC charging voltage. The high-voltage, low-current and low-voltage, high-current composite discharge method fully improves the efficiency of charging energy use, and can effectively remove carbon deposits on the surface of the spark plug. The drive module isolates the spark plug from the energy storage module by setting the first transistor and the second transistor, and realizes effective control of the charging and discharging timing of the ignition charging by controlling the opening and closing of the first transistor and the second transistor. , to avoid the direct discharge of the energy storage module caused by carbon deposition on the spark plug, and prolong the service life of the ignition system.

The present invention also proposes a solid ablation pulsed electric thruster, the solid ablation pulsed electric thruster includes the above ignition circuit, and the specific structure of the ignition circuit refers to the above-mentioned embodiment, because the solid ablation pulsed electric thruster adopts It has all the technical solutions of the above-mentioned embodiments, and therefore at least has all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, and will not be repeated here.

The above descriptions are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformations made by the contents of the description and drawings of the present invention, or the direct/indirect application Other related technical fields are included in the scope of patent protection of the present invention.

Claims (10)

1. An ignition circuit is characterized by comprising an ignition voltage regulating module, an energy storage module, an isolation module and a driving module; wherein,

the ignition voltage adjusting module is used for charging the energy storage module;

the energy storage module is used for storing electric energy;

the driving module releases electric energy in the energy storage module to ignite the spark plug according to the isolated ignition trigger signal; the driving module comprises a first transistor, a second transistor, a first diode, a second diode, a transformer and a resonant capacitor; the grid electrode of the first transistor is connected with the isolation module, the source electrode of the first transistor is grounded, the drain electrode of the first transistor is connected with the anode of the first diode, and the cathode of the first diode is connected with the energy storage module; the grid electrode of the second transistor is connected with the isolation module, the source electrode of the second transistor is connected with the anode of the second diode, the cathode of the second diode is connected with the spark plug, and the cathode of the second diode is also connected with the first end of the secondary coil of the transformer; a first end of the primary coil of the transformer is connected with a cathode of the first diode, and a second end of the primary coil of the transformer is connected with an anode of the first diode; a second end of the secondary coil of the transformer is grounded through the resonant capacitor;

the driving module further comprises a voltage-stabilizing tube, the anode of the voltage-stabilizing tube is grounded, and the cathode of the voltage-stabilizing tube is connected with the source electrode of the second transistor.

2. The ignition circuit of claim 1, wherein the isolation module is configured to receive an ignition trigger signal, and to output the ignition trigger signal to the driver module after isolation.

3. The ignition circuit of claim 2, wherein the isolation module comprises an opto-isolator chip comprising a first signal terminal, a first ground terminal, a second signal terminal, a second ground terminal, a first output terminal, a second output terminal, a first power input terminal, a first power ground terminal, a second power input terminal, a second power ground terminal; the first signal terminal is connected with the second signal terminal, and the first ground terminal is connected with the second ground terminal; the first power supply input end is connected with a first direct current power supply, and the first power supply grounding end is grounded in a floating mode; the second power supply input end is connected with a second direct-current power supply, and the second power supply grounding end is grounded; the first output end is connected with the driving module, and the second output end is connected with the driving module.

4. An ignition circuit as claimed in any one of claims 1 to 3, wherein the ignition voltage adjustment module comprises a PWM controller, a third transistor, a first resistor and a first inductor; the control end of the PWM controller is connected to the gate of the third transistor, the drain of the third transistor is connected to the first end of the first inductor, the second end of the first inductor is connected to a third dc power supply, the emitter of the third transistor is connected to the first end of the first resistor, and the second end of the first resistor is grounded.

5. The ignition circuit of claim 4, wherein the PWM controller further comprises a current feedback terminal, the current feedback terminal of the PWM controller being connected to the first terminal of the first resistor;

the PWM controller detects a current flowing through the third transistor, compares the current with a preset current threshold, and turns off the third transistor when the detected current is greater than the preset current threshold.

6. The ignition circuit of claim 5 wherein said ignition voltage adjustment module further comprises a third diode, an anode of said third diode being connected to said first terminal of said first inductor, a cathode of said third diode being connected to said energy storage module.

7. The ignition circuit of claim 6 wherein said ignition voltage adjustment module further comprises a first capacitor, a first terminal of said first capacitor being connected to a cathode of said third diode, a second terminal of said first capacitor being connected to ground.

8. The ignition circuit of claim 7, wherein the ignition voltage adjustment module further comprises a second resistor and a third resistor, the PWM controller includes a voltage feedback terminal, a first terminal of the second resistor is connected to the cathode of the third diode, a second terminal of the second resistor is connected to a first terminal of the third resistor, and a second terminal of the third resistor is connected to ground; the first end of the third resistor is also connected with the voltage feedback end of the PWM controller;

the PWM controller detects the voltage output to the energy storage module, and adjusts the duty ratio of the control signal output to the third transistor according to the detected voltage.

9. The ignition circuit of claim 4, wherein the energy storage module comprises a fourth resistor, a fifth resistor, a second capacitor, and a third capacitor; a first end of the fourth resistor is connected with the ignition voltage adjusting module, a second end of the fourth resistor is connected with a first end of the fifth resistor, and a second end of the fifth resistor is connected with the driving module; the first end of the second capacitor is connected with the second end of the fourth resistor, and the second end of the second capacitor is grounded; the first end of the third capacitor is connected with the second end of the fifth resistor, the second end of the third capacitor is grounded, and the first end of the second capacitor is further connected with the driving module.

10. A solid ablation pulsed electrical thruster characterised in that it comprises an ignition circuit as claimed in any one of claims 1 to 9.