Time division multiplexing Hall thruster power supply system

Abstract

The invention discloses a time-division multiplexing Hall thruster power supply system, which is characterized in that a single-pole double-throw switch K1 and a single-pole double-throw switch K2 are respectively connected to the positive electrode and the negative electrode of an excitation power supply of a thruster, and the excitation power supply supplies power to an excitation coil or a cathode heating wire by switching the states of the single-pole double-throw switch K1 and the single-pole double-throw switch K2; the positive electrode of an anode power supply is connected with a current-limiting resistor and is connected with a single-pole single-throw switch K3 in series, ignition of high-voltage pulses is conducted on a cathode contact pole through the switch K3, and thruster ignition is achieved. According to the technical scheme, the requirement for a Hall thruster power supply is reduced, the requirement for four paths of power sources is directly reduced to two paths of power sources, and the complexity, the weight and the cost of the system are remarkably reduced through time division multiplexing of the excitation power source, the heating power source, the anode power source and the ignition power source. A filter loop is simplified to be a high-capacity capacitor, the coupling relation between the thruster and the anode power source is simplified, meanwhile, the high-capacity capacitor provides enough energy in the ignition process, and the success rate of system ignition is increased.

Description

Technical Field

[0001] The invention relates to the field of space electric propulsion systems, in particular to a time-division multiplexed Hall thruster power supply system. Background Art

[0002] The Hall thruster is composed of an anode, an excitation coil, a cathode heating wire and a cathode contact holding electrode. In the traditional Hall thruster power supply system, the power supply processing and control unit of the Hall thruster is provided, which is composed of 4 power supplies and a filter circuit. The 4 power supplies are respectively the excitation power supply, the heating power supply, the ignition power supply and the anode power supply. The anode power supply is a high-voltage voltage source (voltage 300-600V), the heating power supply and the excitation power supply are constant current sources (current is 2-7A), and the ignition power supply is a high-voltage pulse (voltage 100-600V, pulse width 10ms-1s). The filter circuit FU is composed of various RLC filters. During the ignition process, the heating power supply needs to provide a constant current power supply to heat the cathode heating wire, and the excitation power supply needs to provide a constant current to the Hall thruster excitation coil to generate a steady-state magnetic field. The high-voltage ignition pulse provided by the contact holding electrode generates a plasma discharge to realize the ignition of the Hall thruster.

[0003] This system requires four different types of power supplies to be coordinated according to timing during the ignition process. The design of the entire power system is complex, and new technical solutions are urgently needed to reduce the complexity of the Hall thruster power supply system, reduce the weight of the power supply product, and improve the ignition reliability of the thruster. Summary of the invention

[0004] The technical problem solved by the present invention is: in view of the problem that the Hall electric thruster has a large number of power supply requirements and requires a complex filtering circuit, the present invention provides a time-sharing Hall thruster power supply system, which reduces the complexity, weight and cost of the system through time-sharing multiplexing of various power supplies and devices.

[0005] The technical solution of the present invention is: a time-division multiplexing Hall thruster power supply system, the Hall thruster of the power supply object includes an anode, an excitation coil, a cathode heating wire and a cathode contact holding electrode;

[0006] The power supply system includes an anode power supply and an excitation power supply; the negative pole of the excitation power supply is connected to the common end of the single-pole double-throw switch K1, and the positive pole is connected to the common end of the single-pole double-throw switch K2;

[0007] The positive electrode of the anode power supply is connected to two branches, one branch is connected to the anode, and the other branch is connected to a current limiting resistor and then connected in series with a single-pole single-throw switch K3, and then connected to the cathode contact holding electrode; the negative electrode of the anode power supply is connected to the cathode negative electrode of the cathode heating wire;

[0008] The first branch end of the single-pole double-throw switch K1 is connected to the negative electrode of the anode power supply and the cathode negative electrode of the cathode heating wire respectively, and the second branch end is connected to the excitation negative electrode of the excitation coil; the first branch end of the single-pole double-throw switch K2 is connected to the excitation positive electrode of the excitation coil, and the second branch end is connected to the heating positive electrode of the cathode heating wire; a filter capacitor is connected between the first branch end of the single-pole double-throw switch K1 and the anode;

[0009] By switching the states of the single-pole double-throw switch K1 and the single-pole double-throw switch K2 and adjusting the state of the single-pole single-throw switch K3, time-sharing power supply to the anode, excitation coil, cathode heating wire and cathode contact holding electrode can be achieved. At the same time, the filter capacitor is used to provide sufficient energy to improve the reliability of thruster ignition.

[0010] Furthermore, the single-pole double-throw switch K1 and the single-pole double-throw switch K2 are electronic switches or mechanical relay switches, and the single-pole single-throw switch K3 is a high-voltage resistant electronic switch.

[0011] Furthermore, the withstand voltage value of the single-pole single-throw K3 is greater than the anode voltage.

[0012] Furthermore, the anode voltage ranges from 300V to 600V.

[0013] Furthermore, the resistance of the current limiting resistor is greater than 1K ohm.

[0014] Furthermore, the capacity of the filter capacitor is greater than 10uF.

[0015] Furthermore, the specific method of realizing the time-sharing power supply to the anode, the excitation coil, the cathode heating wire and the cathode contact holding electrode is as follows:

[0016] Switch the single-pole double-throw switch K1 to its first branch end, switch the single-pole double-throw switch K2 to its second branch end, turn on the excitation power supply, set the output current of the excitation power supply, and supply power to the cathode heating wire;

[0017] Turn on the anode power supply, wait for a while, and then turn off the excitation power supply;

[0018] Switch the single-pole double-throw switch K1 to its second branch end, switch the single-pole double-throw switch K2 to its first branch end, turn on the excitation power supply, set the output current of the excitation power supply, and supply power to the excitation coil;

[0019] Close the single-pole single-throw switch K3 to provide a high-voltage ignition pulse to the cathode contact pole to ignite the thruster.

[0020] Furthermore, the closing time of the excitation power supply is recorded as T2, and the closing time of the single-pole single-throw switch K3 is recorded as T3, and T3-T2<1s.

[0021] Furthermore, when supplying power to the cathode heating wire, the output current of the excitation power supply is set to I 1 , I1 The size of is determined by the cathode heating wire characteristics and the cathode contact holding characteristics; when powering the excitation coil, the output current of the excitation power supply is set to I 2 , I 2 The size of is determined by the characteristics of the excitation coil.

[0022] Furthermore, the waiting time after turning on the anode power supply is jointly determined by the cathode heating wire characteristics and the cathode contact holding electrode characteristics.

[0023] The advantages of the present invention compared with the prior art are:

[0024] (1) The technical solution proposed in the present invention reduces the demand for Hall thruster power supply, directly reducing the demand for 4 power supplies to 2. By time-sharing the excitation power supply and heating power supply, anode power supply and ignition power supply, the complexity, weight and cost of the system are significantly reduced, making the electric propulsion system more commercially competitive.

[0025] (2) The present invention ingeniously realizes the reuse of the excitation power supply and the heating power supply through two single-pole double-throw switches, and realizes the ignition pulse of the Hall thruster through a current-limiting resistor in series with an electronic switch, thereby increasing the ignition voltage to the anode high voltage and reducing the demand for a single ignition power supply. At the same time, the electronic switch K3 can continuously switch multiple pulses to achieve high-reliability ignition of the Hall thruster.

[0026] (3) Simplify the filter circuit into a large-capacity capacitor, simplify the coupling relationship between the thruster and the anode power supply. At the same time, the large-capacity capacitor can provide sufficient energy during the ignition process, thereby improving the success rate of the system ignition. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a schematic diagram of the time-division multiplexing Hall thruster power supply system of the present invention. DETAILED DESCRIPTION

[0028] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The parts of each structure in the accompanying drawings will be described separately. It is worth noting that the components not shown in the drawings or not described in words are forms known to ordinary technicians in the relevant technical field.

[0029] like Figure 1 As shown, the time-division multiplexed Hall thruster power supply system proposed by the present invention includes an anode power supply and an excitation power supply. The excitation power supply can set the output current, and when supplying power to the excitation coil and the cathode heating wire, the required power supply current can be set.

[0030] The negative pole and positive pole of the excitation power supply are respectively connected to the common end of the single-pole double-throw switch K1 and the common end of the single-pole double-throw switch K2; by switching the states of the switches K1 and K2, the excitation power supply can supply power to the excitation coil or to the cathode heating wire.

[0031] The positive pole of the anode power supply is connected to two branches, one branch is connected to the anode, and the other branch is connected to a current limiting resistor and then connected in series with a single-pole single-throw switch K3, and then connected to the cathode contact holding electrode; the negative pole of the anode power supply is connected to the cathode negative pole of the cathode heating wire; by closing and opening the switch K3, a high-voltage pulse is provided to ignite the cathode contact holding electrode. At the same time, during the ignition process, the large-capacity capacitor of the filter can provide sufficient energy to improve the reliability of thruster ignition.

[0032] The first branch end of the single-pole double-throw switch K1 is connected to the negative electrode of the anode power supply and the negative electrode of the cathode heating wire respectively, and the second branch end is connected to the negative excitation electrode of the excitation coil; the first branch end of the single-pole double-throw switch K2 is connected to the positive excitation electrode of the excitation coil, and the second branch end is connected to the positive heating electrode of the cathode heating wire;

[0033] By switching the states of the single-pole double-throw switch K1 and the single-pole double-throw switch K2 and adjusting the state of the single-pole single-throw switch K3, time-sharing power supply to the anode, the excitation coil, the cathode heating wire and the cathode contact holding electrode is achieved.

[0034] Preferably, the SPDT switch K1 and the SPDT switch K2 are electronic switches or mechanical relay switches, and the SPST K3 is a high voltage resistant electronic switch. The withstand voltage of the SPST K3 is greater than the anode voltage, specifically, the anode voltage range is 300V to 600V.

[0035] Preferably, the resistance of the current limiting resistor is greater than 1K ohm, and the thermal power of the resistor during the ignition high voltage process needs to be considered.

[0036] The specific method of using the time-sharing multiplexed Hall thruster power supply system to realize time-sharing power supply to the anode, excitation coil, cathode heating wire and cathode contact holding electrode is as follows:

[0037] (1) Switch the single-pole double-throw switch K1 to its first branch end (i.e., connected to the cathode), switch the single-pole double-throw switch K2 to its second branch end (i.e., connected to the heating positive electrode), turn on the excitation power supply, and set the output current of the excitation power supply to I 1 (I 1 The size of is determined by the characteristics of the cathode heating wire and the cathode contact holding electrode), and supplies power to the cathode heating wire;

[0038] (2) Turn on the anode power supply and wait for T 0 seconds (the waiting time is determined by the characteristics of the cathode heating wire and the cathode contact holding pole), turn off the excitation power supply, and the turning-off time is recorded as T2;

[0039] (3) Switch the single-pole double-throw switch K1 to its second branch end (i.e., connected to the negative pole of the excitation), switch the single-pole double-throw switch K2 to its first branch end (i.e., connected to the positive pole of the excitation), turn on the excitation power supply, and set the output current of the excitation power supply to I 2 (I 2 The size of is determined by the characteristics of the excitation coil), and supplies power to the excitation coil;

[0040] (4) Close the single-pole single-throw switch K3, and the closing time is recorded as T3 (must satisfy T3-T2<1s), and provide a high-voltage ignition pulse to the cathode contact pole to realize thruster ignition; when the thruster ignites successfully, open the switch K3.

[0041] It is to be understood that the present invention is described by way of embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and embodiments that can fall within the scope of the claims of this application all fall within the scope protected by the present invention.

[0042] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A time-division multiplexing Hall thruster power supply system, the Hall thruster to be powered includes an anode, an excitation coil, a cathode heating wire and a cathode contact holding electrode, characterized in that: The power supply system includes an anode power supply and an excitation power supply; the negative pole of the excitation power supply is connected to the common end of the single-pole double-throw switch K1, and the positive pole is connected to the common end of the single-pole double-throw switch K2; The positive electrode of the anode power supply is connected to two branches, one branch is connected to the anode, and the other branch is connected to a current limiting resistor and then connected in series with a single-pole single-throw switch K3, and then connected to the cathode contact holding electrode; the negative electrode of the anode power supply is connected to the cathode negative electrode of the cathode heating wire; The first branch end of the single-pole double-throw switch K1 is connected to the negative electrode of the anode power supply and the cathode negative electrode of the cathode heating wire respectively, and the second branch end is connected to the excitation negative electrode of the excitation coil; the first branch end of the single-pole double-throw switch K2 is connected to the excitation positive electrode of the excitation coil, and the second branch end is connected to the heating positive electrode of the cathode heating wire; a filter capacitor is connected between the first branch end of the single-pole double-throw switch K1 and the anode; By switching the states of the single-pole double-throw switch K1 and the single-pole double-throw switch K2 and adjusting the state of the single-pole single-throw switch K3, time-sharing power supply to the anode, excitation coil, cathode heating wire and cathode contact holding electrode can be achieved. At the same time, the filter capacitor is used to provide sufficient energy to improve the reliability of thruster ignition.

2. The time-division multiplexed Hall thruster power supply system according to claim 1 is characterized in that: The single-pole double-throw switch K1 and the single-pole double-throw switch K2 are electronic switches or mechanical relay switches, and the single-pole single-throw switch K3 is a high-voltage resistant electronic switch.

3. The time-division multiplexed Hall thruster power supply system according to claim 2 is characterized in that: The withstand voltage value of the single-pole single-throw K3 is greater than the anode voltage.

4. The time-division multiplexed Hall thruster power supply system according to claim 3 is characterized in that: The anode voltage range is 300V to 600V.

5. The time-division multiplexed Hall thruster power supply system according to claim 1 is characterized in that: The resistance of the current limiting resistor is >1K ohm.

6. The time-division multiplexed Hall thruster power supply system according to claim 1 is characterized in that: The capacity of the filter capacitor is > 10uF.

7. The time-division multiplexing Hall thruster power supply system according to any one of claims 1 to 6, characterized in that: The specific method of realizing the time-sharing power supply to the anode, the excitation coil, the cathode heating wire and the cathode contact holding electrode is: Switch the single-pole double-throw switch K1 to its first branch end, switch the single-pole double-throw switch K2 to its second branch end, turn on the excitation power supply, set the output current of the excitation power supply, and supply power to the cathode heating wire; Turn on the anode power supply, wait for a while, and then turn off the excitation power supply; Switch the single-pole double-throw switch K1 to its second branch end, switch the single-pole double-throw switch K2 to its first branch end, turn on the excitation power supply, set the output current of the excitation power supply, and supply power to the excitation coil; Close the single-pole single-throw switch K3 to provide a high-voltage ignition pulse to the cathode contact pole to ignite the thruster.

8. The time-division multiplexed Hall thruster power supply system according to claim 7 is characterized in that: The closing time of the excitation power supply is recorded as T2, and the closing time of the single-pole single-throw switch K3 is recorded as T3, T3-T2<1s.

9. The time-division multiplexed Hall thruster power supply system according to claim 7, characterized in that: When powering the cathode heating wire, the output current of the excitation power supply is set to I1, and the size of I1 is jointly determined by the characteristics of the cathode heating wire and the cathode contact pole characteristics; when powering the excitation coil, the output current of the excitation power supply is set to I2, and the size of I2 is determined by the characteristics of the excitation coil.

10. The time-division multiplexed Hall thruster power supply system according to claim 7, characterized in that: The waiting time after turning on the anode power supply is determined by the cathode heating wire characteristics and the cathode contact holding electrode characteristics.

Images