CN108678920B - Firing circuit and solid ablation pulsed electric thruster - Google Patents
Firing circuit and solid ablation pulsed electric thruster Download PDFInfo
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- CN108678920B CN108678920B CN201810477041.8A CN201810477041A CN108678920B CN 108678920 B CN108678920 B CN 108678920B CN 201810477041 A CN201810477041 A CN 201810477041A CN 108678920 B CN108678920 B CN 108678920B
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- 238000002679 ablation Methods 0.000 title claims abstract description 11
- 239000007787 solid Substances 0.000 title claims abstract description 9
- 238000010304 firing Methods 0.000 title abstract 3
- 238000004146 energy storage Methods 0.000 claims abstract description 60
- 238000002955 isolation Methods 0.000 claims abstract description 46
- 239000003990 capacitor Substances 0.000 claims description 43
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 238000007599 discharging Methods 0.000 abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 230000003287 optical effect Effects 0.000 description 8
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000008021 deposition Effects 0.000 description 7
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 2
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 2
- 108091092878 Microsatellite Proteins 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H1/00—Using plasma to produce a reactive propulsive thrust
- F03H1/0087—Electro-dynamic thrusters, e.g. pulsed plasma thrusters
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
It includes ignition voltage adjustment module, energy-storage module, isolation module and drive module that the present invention, which discloses a kind of firing circuit and solid ablation pulsed electric thruster, firing circuit,；Ignition voltage adjustment module, for charging to energy-storage module；Energy-storage module, for storing electric energy；Isolation module exports after isolation to drive module for receiving ignition trigger signals；Drive module, according to the ignition trigger signals after isolation, the electric energy discharged in energy-storage module lights spark plug.Technical solution of the present invention passes through setting the first transistor and second transistor, so that being isolated between spark plug and energy-storage module, it is turned on and off by control the first transistor and second transistor, realize effective control to igniting charge and discharge opportunity, it avoids spark plug from directly discharging because carbon distribution causes energy-storage module, extends the service life of ignition system.
Description
Technical Field
The invention relates to the technical field of electric propulsion, in particular to an ignition circuit and a solid ablation pulse type electric thruster.
Background
The solid ablation impulse type electric thruster is a thruster which generates an electric arc by utilizing pulse discharge of energy storage devices such as a capacitor and the like, pushes working medium of the thruster to be ablated and ionized under the action of the electric arc, and generates thrust by accelerating ejection of ablation and ionization products in a discharge channel under the action of Lorentz force and aerodynamic force. One typical thruster, Pulse Plasma Thruster (PPT), has been widely used in microsatellites for the missions of microsatellite orbit maintenance, constellation site maintenance, drag compensation, etc.
The thruster is limited by the power of a star power supply, the thruster mostly adopts an induction excitation mode to generate discharge between polar plates of the thruster, and a spark plug provides a plasma source for inducing the main discharge of the thruster. The spark plug discharge and the thruster main discharge can both generate strong electromagnetic interference, the existing spark plug ignition circuit has weak interference resistance, and after the thruster works for a long time, the cathode plate and the anode plate of the spark plug can be short-circuited due to carbon deposition formed on the surface of the semiconductor ring, so that the electric energy of the ignition energy storage device is released, and the spark plug cannot ignite, so that the thruster fails.
Disclosure of Invention
The invention mainly aims to provide an ignition circuit, aiming at improving the anti-interference performance and reliability of the ignition circuit.
In order to achieve the above object, the present invention provides an ignition circuit, which includes an ignition voltage adjusting module, an energy storage 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 isolation module is used for receiving an ignition trigger signal, and outputting the ignition trigger signal to the driving module after isolation;
and the driving module releases the electric energy in the energy storage module to ignite the spark plug according to the isolated ignition trigger signal.
Preferably, the ignition circuit further comprises an isolation module, and the isolation module is used for receiving the ignition trigger signal, and outputting the ignition trigger signal to the driving module after being isolated.
Preferably, 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 transformer primary coil is connected with a cathode of the first diode, and a second end of the transformer primary coil is connected with an anode of the first diode; and the second end of the secondary coil of the transformer is grounded through the resonant capacitor.
Preferably, the driving module further comprises a voltage regulator tube, an anode of the voltage regulator tube is grounded, and a cathode of the voltage regulator tube is connected with the source electrode of the second transistor.
Preferably, the isolation module includes an optical coupling isolation chip, and the optical coupling 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 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 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.
Preferably, the ignition voltage adjusting 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.
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 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.
Preferably, the ignition voltage regulating module further includes a third diode, an anode of the third diode is connected to the first end of the first inductor, and a cathode of the third diode is connected to the input end of the energy storage module.
Preferably, the ignition voltage regulating module further comprises a first capacitor, a first end of the first capacitor is connected with a cathode of the third diode, and a second end of the first capacitor is grounded.
Preferably, the ignition voltage adjusting module further includes 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 a 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 grounded; 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.
Preferably, 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 an output end of 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 a first input end of 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 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 comprising an ignition circuit as described above. The ignition circuit comprises an ignition voltage adjusting module, an energy storage module, an isolation module and a driving module; the ignition voltage adjusting module is used for charging the energy storage module; the energy storage module is used for storing electric energy; the isolation module is used for receiving an ignition trigger signal, and outputting the ignition trigger signal to the driving module after isolation; and the driving module releases the electric energy in the energy storage module according to the isolated ignition trigger signal.
According to the technical scheme, the ignition circuit is formed by arranging the ignition voltage adjusting module, the energy storage module and the driving module. The driving module is provided with the first transistor and the second transistor, so that the spark plug is isolated from the energy storage module, the ignition charging and discharging opportunity is effectively controlled by controlling the on and off of the first transistor and the second transistor, the direct discharging of the energy storage module caused by carbon deposition of the spark plug is avoided, and the service life of the ignition system is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of one embodiment of an ignition circuit of the present invention;
fig. 2 is a schematic circuit diagram of an ignition circuit according to an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Ignition voltage regulating module | Cs | Resonance capacitor |
| 200 | Energy storage module | T | Transformer device |
| 300 | Isolation module | Q1～Q3 | First to third transistors |
| 400 | Drive module | H | Spark plug |
| 500 | Spark plug | L1 | First inductor |
| R1～R5 | First to fifth resistors | U2 | PWM |
| C1～C3 | First to third capacitors | ZD1 | Voltage stabilizing tube |
| U1 | Isolated power supply chip | D1～D3 | First to third diodes |
| VCC1 | First direct current power supply | VCC3 | Third DC power supply |
| VCC2 | Second DC power supply |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
The invention provides an ignition circuit.
Referring to fig. 1, in the embodiment of the present invention, the ignition circuit includes an ignition voltage regulating module 100, an energy storage module 200, an isolation module 300, and a driving module 400.
The ignition voltage adjusting module 100 is configured to charge the energy storage module 200. The ignition regulating module is connected to a satellite bus power supply (hereinafter, referred to as a second dc power supply VCC2 and a third dc power supply VCC3), and charges the energy storage module 200 after regulating the output voltage of the satellite bus power supply.
The energy storage module 200 is used for storing electric energy. The energy storage module 200 stores energy by using a capacitive element, and the energy storage module 200 discharges electricity through the spark plug 500 under the control of the ignition trigger signal by storing the electric energy input by the ignition voltage adjusting module 100.
The isolation module 300 is configured to receive an ignition trigger signal, and output the ignition trigger signal to the driving module 400 after isolation. The isolation module 300 may use the existing isolation means such as optical coupling isolation, isolation amplifier, etc. to perform isolation.
The driving module 400 releases the electric 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 the electric energy of the energy storage module 200 is discharged to the spark plug 500 through the driving module 400, thereby performing the discharge.
According to the technical scheme of the invention, the ignition voltage regulating module 100, the energy storage module 200, the isolation module 300 and the driving module 400 are arranged to form an ignition circuit. 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 a weak current side, and the driving module 400 is a strong current side, so that the isolation of the weak current side and the strong current side is realized, the interference of the strong current side to the weak current is avoided, and the anti-interference performance of the ignition circuit is improved.
Referring to fig. 2, in particular, 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 of the first transistor Q1 is connected with the isolation module 300, the source of the first transistor Q1 is grounded, the drain of the first transistor Q1 is connected with the anode of the first diode D1, and the cathode of the first diode D1 is connected with the energy storage module 200; the gate of the second transistor Q2 is connected to the isolation module 300, 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 (i.e., spark plug 500 in fig. 1), and the cathode of the second diode D2 is also connected to the first end of the secondary winding of the transformer T; a first end of the primary coil of the transformer T is connected with a cathode of the first diode D1, and a second end of the primary coil of the transformer T is connected with an anode of the first diode D1; a second end of the secondary coil of the transformer T is grounded via the resonant capacitor Cs.
Further, the driving module further comprises a voltage regulator ZD1, the anode of the voltage regulator ZD1 is grounded, and the cathode of the voltage regulator ZD1 is connected with the source electrode of the second transistor Q2, so that the effect of preventing the source electrode of the second transistor Q2 from generating large voltage and preventing the second transistor Q2 from being damaged is achieved.
In this embodiment, IGBTs are used for the first transistor Q1 and the second transistor Q2. The first diode D1 is used for clamping the voltage at the drain of the first transistor Q1 and releasing the energy of the leakage inductance of the transformer T, and the second diode D2 is used for preventing the current in the circuit loop from reversing. The transformer T boosts the voltage across the first diode D1 and outputs the boosted voltage to the spark plug, so that the voltage across the spark plug reaches the turn-on voltage of the spark plug, and discharge occurs.
It should be noted that after the spark plug is used for a long time, carbon deposition is generated on the surface of the semiconductor ring, the spark plug is easy to be short-circuited, and direct discharge is caused after the spark plug is powered on, and the driving module is provided with the first transistor Q1 and the second transistor Q2, so that the spark plug H is isolated from the energy storage module 200, and the phenomenon that the energy storage module 200 cannot be charged and the spark plug H cannot be ignited due to direct discharge of the energy storage module 200 caused by the carbon deposition of the spark plug H is avoided. 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 the boosted voltage to the spark plug H, so that the voltage level in the energy storage module 200 is reduced, and the spark plug H can be discharged at a lower dc charging voltage. The high-voltage low-current and low-voltage high-current combined discharging mode fully improves the charging energy use efficiency, and can effectively remove carbon deposition on the surface of the spark plug H.
The driving module 400 receives an ignition trigger signal to control the on and off of the first transistor Q1 and the second transistor Q2, so as to effectively control the time of ignition charging and discharging.
The gates of the first transistor Q1 and the second transistor Q2 are both connected to the isolation module 300, and 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 channels are formed and transmitted 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 optical coupling isolation chip, where the optical coupling 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 second output terminal 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, and the first ground terminal OUT1 is connected to the second ground terminal OUT 2; the first power supply input end VCC is connected with a first direct current power supply VCC1, and a first power supply grounding end VEE is grounded in a floating mode; the second power supply input terminal VCC is connected with a second direct current power supply VCC2, and the second power supply ground terminal VEE 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 type of the optical coupling 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 outputted from the satellite main controller. The optical coupling isolation chip of the HCPL-315J type comprises two optical couplers, so that one path of ignition trigger signal is divided into two paths to respectively drive a first transistor Q1 and a second transistor Q2.
Specifically, the ignition voltage regulating module 100 includes a PWM controller U2, a third transistor Q3, a first resistor R1, and a first inductor L1; a control terminal of the PWM controller U2 is connected to a gate of the third transistor Q3, a drain of the third transistor Q3 is connected to a first terminal of the first inductor L1, a second terminal of the first inductor L1 is connected to a third dc power source VCC3, an emitter of the third transistor Q3 is connected to a first terminal of the first resistor R1, and a second terminal of the first resistor R1 is grounded.
The first inductor L1 is a boost inductor. The PWM controller U2 outputs a PWM wave with a certain duty ratio to control the third transistor Q3 to be turned on and off periodically, so as to charge the energy storage module 200 after boosting the electric energy of the third dc power supply.
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 a 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 third transistor Q3. When the current flowing through the third transistor Q3 is too large, the components in the circuit are prevented from being damaged, and the PWM controller U2 stops outputting the PWM wave, so that the reliability and safety of the ignition voltage adjusting module 100 are improved.
Further, the ignition voltage regulating module 100 further includes a third diode D3, an anode of the third diode D3 is connected to the first end of the first inductor L1, and a cathode of the third diode D3 is connected to the input terminal of the energy storage module 200. The third diode D3 prevents the voltage in the energy storage module 200 from being anti-series into the third dc power supply VCC 3.
Further, the ignition voltage regulating module 100 further includes a first capacitor C1, a first end of the first capacitor C1 is connected to the cathode of the third diode D3, and a second end of the first capacitor is grounded.
The first capacitor C1 is used for filtering and stabilizing 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 adjusting module 100 further includes a second resistor R2 and a third resistor R3, the PWM controller U2 includes a voltage feedback terminal, a first terminal of the second resistor R2 is connected to the cathode of the third diode D3, a second terminal of the second resistor R2 is connected to a first terminal of the third resistor R3, and a second terminal of the third resistor R3 is grounded; the first end of the third resistor R3 is also connected with the voltage feedback end 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, the duty ratio of the control signal is reduced to lower the voltage output by the ignition voltage regulating module 100 to the energy storage module 200; when the PWM controller U2 detects that the voltage across the third resistor R3 is low, the duty cycle of the control signal is increased to increase the voltage output from the ignition voltage regulating module 100 to the energy storage module 200. Thus, 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; a first end of the fourth resistor R4 is connected to the output end of the ignition voltage regulating module 100, a second end of the fourth resistor R4 is connected to a first end of the fifth resistor R5, and a second end of the fifth resistor R5 is connected to a first input end of the driving module 400; a first end of the second capacitor C2 is connected with a second end of the fourth resistor R4, and a second end of the second capacitor C2 is grounded; the first terminal of the third capacitor C3 is connected to the second terminal of the fifth resistor R5, the second terminal of the third capacitor C3 is grounded, and the first terminal of the second capacitor C2 is further 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 electric energy.
Based on the technical scheme, the invention at least can achieve the following effects:
the invention has a feedback regulation voltage stabilization module, can effectively improve the charging voltage stability of the ignition energy storage capacitor by matching with filtering and high-voltage isolation arrangement, and realizes the isolation of high-voltage and low-voltage circuits.
The ignition trigger control circuit realizes the thorough isolation of the ignition trigger control and the charge and discharge circuit, avoids the damage of the ignition discharge high voltage to the components of the ignition trigger control low-voltage circuit, improves the anti-interference capability of the ignition system and reduces the false trigger rate of the system.
The invention realizes the effective control of the time of charging and discharging of the ignition charge, obtains the spark plug capable of high-frequency discharging and igniting, and provides a necessary condition for the high-frequency discharging work of the thruster; by adding circuit designs such as overvoltage protection diode protective components, the reliability of the circuit components in working under a strong electromagnetic environment is effectively improved.
According to the invention, the driving module boosts the voltage at two ends of the first diode D1 through the transformer T and outputs the boosted voltage to the spark plug, so that the voltage level in the energy storage module is reduced, and the spark plug is discharged under a lower direct-current charging voltage. The high-voltage small current and low-voltage large current combined discharging mode fully improves the charging energy use efficiency, and can effectively remove carbon deposition on the surface of the spark plug. The driving module enables the spark plug to be isolated from the energy storage module by arranging the first transistor and the second transistor, and realizes effective control of the time of ignition charging discharging by controlling the on and off of the first transistor and the second transistor, so that the direct discharging of the energy storage module caused by carbon deposition of the spark plug is avoided, and the service life of an ignition system is prolonged.
The invention further provides a solid ablation pulse type electric thruster, which comprises the ignition circuit, the specific structure of the ignition circuit refers to the above embodiment, and the solid ablation pulse type electric thruster adopts all technical schemes of all the above embodiments, so that the solid ablation pulse type electric thruster at least has all the beneficial effects brought by the technical schemes of the above embodiments, and details are not repeated herein.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope 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.
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| CN201810477041.8A CN108678920B (en) | 2018-05-17 | 2018-05-17 | Firing circuit and solid ablation pulsed electric thruster |
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| CN201810477041.8A CN108678920B (en) | 2018-05-17 | 2018-05-17 | Firing circuit and solid ablation pulsed electric thruster |
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