阅读说明：本技术 一种复合推力器负载自适应电源系统及供电方法 (Composite thruster load self-adaptive power supply system and power supply method ) 是由 王效顺 黄惠军 董玉财 孙静 方进勇 于 2019-07-09 设计创作，主要内容包括：本发明涉及一种复合推力器负载自适应电源系统及供电方法,属于电源技术领域。一种复合推力器负载自适应电源系统,包括电离模块、控制模块和等离子体加速模块,既能输出推力器工质气体电离所需的高电压,又能输出等离子体加速所需的大电流；所述电离模块通过脉冲变压器耦合输出,脉冲变压器次级线圈低电位端与推力器阴极连接,高电位端与所述等离子体加速模块的储能电容器串联后与推力器阳极连接并接大地；两个模块的输出根据负载变化自动切换,并且通过脉冲变压器次级线圈实现了低压等离子体加速模块与电离模块之间的可靠隔离。(The invention relates to a load self-adaptive power supply system and a power supply method for a composite thruster, and belongs to the technical field of power supplies. A composite thruster load self-adaptive power supply system comprises an ionization module, a control module and a plasma acceleration module, and can output high voltage required by the ionization of working medium gas of a thruster and large current required by the acceleration of plasma; the ionization module is coupled and output through a pulse transformer, the low potential end of a secondary coil of the pulse transformer is connected with the cathode of the thruster, and the high potential end of the secondary coil of the pulse transformer is connected with the energy storage capacitor of the plasma acceleration module in series and then connected with the anode of the thruster and grounded; the outputs of the two modules are automatically switched according to the load change, and the reliable isolation between the low-voltage plasma accelerating module and the ionizing module is realized through the secondary coil of the pulse transformer.)

1. A composite thruster load self-adaptive power supply system is used for supplying power to a thruster and is characterized by comprising an ionization module, a plasma acceleration module and a control module;

the ionization module comprises a charging power supply, a pulse capacitor (C1) and a pulse transformer (T1); the plasma accelerating module comprises a direct current power supply, an energy storage capacitor (C2); the direct current power supply is used for charging an energy storage capacitor (C2);

the charging power supply is used for charging a pulse capacitor (C1), and the pulse capacitor (C1) is used for supplying power to a pulse transformer (T1); the low potential end of the secondary coil of the pulse transformer (T1) is connected with the cathode of the thruster; the high potential end of the secondary coil is connected with the anode of the thruster after being connected with the energy storage capacitor (C2) in series;

the control module is used for controlling the charging or discharging of the pulse capacitor (C1) and the energy storage capacitor (C2).

2. The composite thruster load adaptive power supply system of claim 1, wherein the control module controls the charging power supply to stop charging the pulse capacitor (C1) when the pulse capacitor (C1) is charged to a rated voltage.

3. The composite thruster load adaptive power supply system according to claim 1, wherein the ionization module further comprises a discharge switch (S1), a charging resistor (R1), a discharging resistor (R2), a damping resistor (R3), a damping diode (D1); one end of the charging power supply is connected with the other end of the charging power supply after being sequentially connected with a charging resistor (R1), a discharging resistor (R2) and a discharging switch (S1); the pulse capacitor (C1), the damping resistor (R3) and the damping diode (D1) are connected in parallel with the discharge resistor (R2) and the discharge switch (S1); the damping resistor (R3) and the damping diode (D1) are connected with the primary coil of the pulse transformer (T1) in parallel.

4. The composite thruster load adaptive power supply system according to claim 3, wherein the control module controls the discharge switch (S1) to be closed when the pulse capacitor (C1) supplies power to the pulse transformer (T1).

5. The composite thruster load adaptive power supply system according to claim 3, wherein the discharge switch (S1) adopts a hydrogen thyratron.

6. The composite thruster load adaptive power supply system according to claim 3, wherein the boosting ratio of the pulse transformer (T1) is greater than or equal to 1: 10.

7. The composite thruster load adaptive power supply system according to claim 4, wherein the control module controls the closing repetition frequency of the discharge switch (S1) to be less than or equal to 100 Hz.

8. A composite thruster load self-adaptive power supply method is characterized in that the composite thruster load self-adaptive power supply system of any one of claims 1 to 7 is adopted, and the method comprises the following steps:

s10, the control module controls the charging power supply and the direct current power supply to respectively charge the pulse capacitor (C1) and the energy storage capacitor (C2);

s20, when the pulse capacitor (C1) is charged to the rated voltage, the control module controls the charging power supply to stop charging the pulse capacitor (C1);

and S30, the control module controls the discharge switch (S1) to be switched on, the pulse capacitor (C1) and the energy storage capacitor (C2) supply power to the thruster simultaneously, and the pulse capacitor (C1) supplies power to the thruster through the pulse transformer (T1).

9. The composite thruster load adaptive power supply method of claim 8, wherein after S30, when a discharging current of the pulse capacitor (C1) is less than or equal to a turn-on threshold of the discharging switch (S1), S40 turns off the discharging switch (S1).

10. The method of claim 9, wherein the steps S10-S40 are repeated, and the composite thruster load adaptive power supply system periodically supplies power to the thruster.

Technical Field

The invention relates to a load self-adaptive power supply system and a power supply method for a composite thruster, and belongs to the technical field of power supplies.

Background

The composite thruster is a novel thruster formed by skillfully combining a chemical propulsion method and an electric propulsion method. In a pulse repetition frequency working mode, in a pulse period, a working medium consisting of fuel and oxidant is firstly broken down by high voltage to generate gas discharge and be ignited to induce chemical combustion reaction; the plasma generated by discharge and combustion can be further accelerated to be sprayed under the action of Lorentz force generated by the interaction of large current and self-induced magnetic field thereof.

The working principle of the composite thruster has certain similarity with that of the existing magnetic plasma thruster, and the composite thruster needs high voltage to puncture working medium gas to discharge and needs large current to maintain discharge and accelerate. Therefore, the load change laws of the two thrusters are very similar, and the impedance of the thrusters is greatly changed before and after the gas breakdown. In the gas discharge process, the impedance of the thruster is gradually reduced from the approximate infinity, and after a stable discharge path is established between the cathode and the anode, the impedance is reduced to the magnitude of dozens of milliohms and tends to be stable. The power supply system is connected between the cathode and the anode of the thruster, and the front and back output modes of the power supply are greatly changed due to the fact that the impedance of the thruster jumps before and after gas breakdown. In the gas breakdown process, a power supply system needs to output high voltage for gas breakdown, and the output current of the thruster is very small due to the fact that the impedance of the thruster is large at the moment; after the stable discharge is established, the power supply system needs to output a large current for accelerating the plasma, and because the impedance of the thruster is extremely small at this time, the output voltage is generally about hundred volts.

The power supply system of the existing magnetic plasma thruster generally comprises a high-voltage and low-current generation module and a low-voltage and plasma acceleration module, wherein the two modules are respectively connected between a cathode and an anode of the thruster in a parallel mode, and the outputs of the two modules are respectively controlled by two switches. The power supply structure has the following outstanding problems: (1) the output control of each module is realized by controlling the on and off of the corresponding switch, the on time sequence of the corresponding switches of the two modules is controlled by the delay module, and the delay is determined by manual continuous adjustment according to the actual working condition, so that the self-adaptive switching of the load cannot be realized. (2) The two modules are connected in parallel, and the isolation between the two modules is generally realized by adding a plurality of diodes in a low-voltage and high-current module for protection. Since the diode is easily damaged at a high voltage, reliability is to be improved.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the ionization module is coupled and output through a pulse transformer, the low potential end of a secondary coil of the pulse transformer is connected with the cathode of the thruster, the high potential end of the secondary coil of the pulse transformer is connected with an energy storage capacitor of the plasma acceleration module in series and then connected with the anode of the thruster and grounded, the outputs of the two modules are automatically switched according to load changes, reliable isolation between the low-voltage plasma acceleration module and the load of the thruster is realized through the secondary coil of the pulse transformer, and the circuit structure is simplified.

The purpose of the invention is realized by the following technical scheme:

a composite thruster load self-adaptive power supply system is used for supplying power to a thruster and comprises an ionization module, a plasma acceleration module and a control module;

the ionization module comprises a charging power supply, a pulse capacitor and a pulse transformer; the plasma accelerating module comprises a direct current power supply and an energy storage capacitor; the direct current power supply is used for charging the energy storage capacitor;

the charging power supply is used for charging the pulse capacitor, and the pulse capacitor is used for supplying power to the pulse transformer; the low-potential end of the secondary coil of the pulse transformer is connected with the cathode of the thruster; the high potential end of the secondary coil is connected with the anode of the thruster after being connected with the energy storage capacitor in series;

the control module is used for controlling the charging or discharging of the pulse capacitor and the energy storage capacitor.

The load self-adaptive power supply system of the composite thruster is characterized in that when the pulse capacitor is charged to a rated voltage, the control module controls the charging power supply to stop charging the pulse capacitor.

The load self-adaptive power supply system of the composite thruster is characterized in that the ionization module further comprises a discharge switch, a charging resistor, a discharge resistor, a damping resistor and a damping diode; one end of the charging power supply is connected with the other end of the charging power supply after being sequentially connected with the charging resistor, the discharging resistor and the discharging switch; the pulse capacitor, the damping resistor and the damping diode are connected with the discharge resistor and the discharge switch in parallel; the damping resistor and the damping diode are connected with the primary coil of the pulse transformer in parallel.

The load self-adaptive power supply system of the composite thruster is characterized in that when the pulse capacitor supplies power to the pulse transformer, the control module controls the discharge switch to be closed.

The load self-adaptive power supply system of the composite thruster is characterized in that the discharge switch adopts a hydrogen thyratron.

The load self-adaptive power supply system of the composite thruster is characterized in that the boosting ratio of the pulse transformer is more than or equal to 1: 10.

The load self-adaptive power supply system of the composite thruster is characterized in that the control module controls the closing repetition frequency of the discharge switch to be less than or equal to 100 Hz.

A composite thruster load self-adaptive power supply method adopts the composite thruster load self-adaptive power supply system and comprises the following steps:

s10, the control module controls the charging power supply and the direct current power supply to respectively charge the pulse capacitor and the energy storage capacitor;

s20, when the pulse capacitor is charged to the rated voltage, the control module controls the charging power supply to stop charging the pulse capacitor;

and S30, the control module controls the discharge switch to be conducted, the pulse capacitor and the energy storage capacitor supply power to the thruster at the same time, and the pulse capacitor supplies power to the thruster through the pulse transformer.

In the above composite thruster load adaptive power supply method, after S30, S40 turns off the discharge switch when the discharge current of the pulse capacitor is less than or equal to the turn-on threshold of the discharge switch.

The self-adaptive power supply method for the load of the composite thruster repeats S10-S40, and the self-adaptive power supply system for the load of the composite thruster periodically supplies power to the thruster.

Compared with the prior art, the invention has the following beneficial effects:

(1) the invention provides a load self-adaptive power supply system of a composite thruster, wherein an ionization module is coupled and output through a pulse transformer, the low potential end of a secondary coil of the pulse transformer is connected with the cathode of the thruster, the high potential end of the secondary coil of the pulse transformer is connected with an energy storage capacitor of a plasma acceleration module in series and then connected with the anode of the thruster and connected with the ground in parallel, and the power supply system can output high voltage required by gas ionization and large current required by plasma acceleration;

(2) compared with the existing power supply structure, the load self-adaptive power supply system of the composite thruster has the advantages that the output of the ionization module and the output of the plasma acceleration module can be automatically switched according to the impedance change of the thruster, and the reliable isolation between the plasma acceleration module and the ionization module can be realized through the secondary coil of the transformer.

Drawings

Fig. 1 is a circuit configuration of a power supply system according to embodiment 3 of the present invention;

fig. 2 is a working timing sequence of the power supply system in embodiment 3 of the present invention;

fig. 3 is a simulation circuit model of a power system according to embodiment 4 of the present invention;

fig. 4 is a simulation verification waveform of the power system in embodiment 4 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.