Power supply applied to space electric propulsion system

Abstract

The invention provides a power supply applied to a space electric propulsion system, which adopts a BUCK current feed type full-bridge topology and a multi-winding transformer design, integrates an anode power supply, a cathode heating power supply and a cathode ignition power supply into a whole, and adopts a fixed duty ratio PWM (Pulse Width Modulation) control and topology fault-tolerant design, so that the power supply can be applied to a space electric propulsion system. The risk of switch tube burnout caused by the single event effect is avoided in the space irradiation environment, selection of low-cost CMOS devices is supported, the number of hardware is reduced through high-integration design, the anti-irradiation cost is reduced through topological optimization, meanwhile, the requirements of an electric propulsion system for power density, reliability and adaptability are met, and the application range is wide. The method is suitable for multi-scene power supply of spacecraft orbit maintenance, attitude adjustment and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of space electric propulsion technology, and particularly relates to a power supply applied to a space electric propulsion system. BACKGROUND

[0002] With the advantages of high specific impulse, long life, and repeatable start, an electric propulsion system can realize long-time stable thrust with less working medium, and has been widely applied to tasks such as orbit maintenance, attitude adjustment, and orbit transfer of a spacecraft in recent years. In the field of commercial spaceflight, the use of electric propulsion to replace traditional chemical propulsion can effectively reduce the total mass of a satellite, improve the load carrying capacity, and to some extent, reduce the launch cost of a launch vehicle.

[0003] However, the space environment is harsh, and the components of the electric propulsion power supply need to be designed and selected for radiation resistance. At the same time, the development of commercial spaceflight puts forward the requirements of lightweight, low cost, and miniaturization for a single machine. Therefore, under the premise of ensuring reliability, the electric propulsion power supply needs to be designed in the direction of low cost and high integration to meet market demand. SUMMARY

[0004] Therefore, the present application adopts a BUCK current feeding full-bridge topology to convert the bus power supply into the power supply required by the thruster. On the basis of providing an anode power supply by the main winding of the transformer secondary side, the cathode heating power supply and the cathode ignition power supply are added to the transformer secondary side. This mode improves the integration level of the anode power supply and the cathode power supply, reduces the hardware cost of the electric propulsion power supply, and reduces the mass of the single machine.

[0005] The present application provides a power supply applied to a space electric propulsion system, comprising: a bus filter module configured to receive a satellite primary bus power supply, convert and filter the bus power supply, and output the converted and filtered bus power supply to a power conversion module; the power conversion module configured to convert the input power supply from the bus filter module into an anode constant voltage, a cathode heating constant current, and a cathode ignition pulse power supply, and output the converted power supply to an output switching module; the output switching module configured to receive timing instructions from a digital interface control module, and control the three types of input power supplies to be output in a time sequence; the power drive module configured to receive reference signals from the digital interface control module and feedback from the power conversion, generate PWM drive signals to control the power conversion module; and the digital interface control module configured to receive external instructions and telemetry from each module, output the reference to the power drive module, output the timing to the output switching module, and upload the telemetry.

[0006] In an embodiment of the present application, the power conversion module comprises: An anode power supply circuit configured to control on-off of an anode power supply output externally according to an instruction; A cathode heating power supply circuit configured to control on-off of a cathode heating power supply output externally; A cathode ignition power supply circuit configured to control on-off of a cathode ignition power supply output externally.

[0007] In an embodiment of the present application, the power conversion module comprises: A first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3, a fourth MOS tube Q4, a fifth MOS tube Q5, a sixth MOS tube Q6, a seventh MOS tube Q7, a first freewheeling diode D1, a second freewheeling diode D2, a first inductor L1, a power transformer L2, a third inductor L3, a first rectifier bridge DB1, a second rectifier bridge DB2, a third rectifier bridge DB3, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4; Wherein the gates of the MOS tubes are connected to the power drive module, and the on-off is controlled by the power drive module; The source of the first MOS tube Q1 is connected to the bus filter module, and the drain of the first MOS tube Q1 is connected to the first end of the first inductor L1; The second end of the first inductor L1 is connected to the source of the second MOS tube Q2, and the first end of the first inductor L1 is connected to the cathode of the first freewheeling diode D1; The anode of the first freewheeling diode D1 is connected to the drain of the fourth MOS tube Q4; The source of the fourth MOS tube Q4 is connected to the first end of the power transformer L2, and the drain of the fourth MOS tube Q4 is connected to the bus filter module; The second end of the power transformer L2 is connected to the drain of the third MOS tube Q3, and the first end of the power transformer L2 is connected to the drain of the second MOS tube Q2; The source of the third MOS tube Q3 is connected to the source of the second MOS tube Q2; The source of the fifth MOS tube Q5 is connected to the second end of the power transformer L2, and the drain of the fifth MOS tube Q5 is connected to the bus filter module; Wherein the third MOS tube Q3 and the fifth MOS tube Q5 are located in the primary winding of the transformer, and the secondary winding of the transformer comprises the anode power supply circuit, the cathode heating power supply circuit, and the cathode ignition power supply circuit.

[0008] In an embodiment of the present application, the anode power supply circuit comprises a rectifier bridge DB1 and a first capacitor C1; Wherein the first end of the rectifier bridge DB1 is connected to the secondary winding of the transformer, and the second end of the rectifier bridge DB1 is connected to the first end of the first capacitor C1; The second terminal of the first capacitor C1 is connected to the secondary winding of the transformer and the output switching module, while the first terminal of the first capacitor C1 is connected to the output switching module.

[0009] In one embodiment of the present invention, the cathode heating power supply circuit includes a third rectifier bridge DB3, a third capacitor C3, a seventh MOSFET Q7, a second freewheeling diode D2, a third inductor L3, and a fourth capacitor C4. Among them, the first end of the third rectifier bridge DB3 is connected to the secondary winding of the transformer, and the second end of the third rectifier bridge DB3 is connected to the first end of the third capacitor C3. The second terminal of the third capacitor C3 is connected to the secondary winding of the transformer, and the first terminal of the third capacitor C3 is connected to the drain of the seventh MOSFET Q7. The source of the seventh MOSFET Q7 is connected to the cathode of the second freewheeling diode D2; The anode of the second freewheeling diode D2 is connected to the second terminal of the third capacitor C3, and the cathode of the second freewheeling diode D2 is connected to the first terminal of the third inductor L3. The second terminal of the third inductor L3 is connected to the first terminal of the fourth capacitor C4 and the output switching module; The second terminal of the fourth capacitor C4 is connected to the anode of the second freewheeling diode D2 and the output switching module.

[0010] In one embodiment of the present invention, the cathode ignition power supply circuit includes a second rectifier bridge DB2, a second capacitor C2, and a sixth MOSFET Q6; The first end of the second rectifier bridge DB2 is connected to the secondary winding of the transformer, and the second end of the second rectifier bridge DB2 is connected to the first end of the second capacitor C2. The second terminal of the second capacitor C2 is connected to the secondary winding of the transformer and the output switching module; The drain of the sixth MOSFET Q6 is connected to the first terminal of the second capacitor C2, and the source of the sixth MOSFET Q6 is connected to the output switching module.

[0011] In one embodiment of the present invention, the bus filtering module includes: The bus surge suppression circuit is configured to protect downstream circuits by suppressing surge current, thus preventing bus abnormalities from impacting the power conversion module. The power switch control circuit is configured to control the on / off state of the bus input. Through logic such as the turn-on delay of the switching transistor, the timing control and surge suppression of the bus input are coordinated. The bus telemetry sampling circuit is configured to collect remote measurements of bus voltage and current and send the data to the digital interface control module.

[0012] In one embodiment of the present invention, the output switching module includes: An anode switching circuit configured to control the on-off of the external output of the anode power supply; A cathode heating switching circuit configured to control the on-off of the external output of the cathode heating power supply; A cathode ignition switching circuit configured to control the on-off of the external output of the cathode ignition power supply.

[0013] In an embodiment of the present application, the power drive module comprises: A control quantity acquisition circuit configured to acquire the output voltage and current of the anode constant voltage power supply, the cathode heating cross current power supply and the cathode ignition pulse power supply, convert the acquired signals into signals suitable for the adaptive control circuit, and synchronously send the signals to the loop control circuit and the digital interface control module; A loop control circuit configured to receive the signals sent by the control quantity acquisition circuit, perform loop compensation with reference signals, and output corresponding PWM control signals; A power device drive circuit configured to isolate and drive the PWM control signals output by the loop control circuit, and provide driving signals for the power conversion module.

[0014] In an embodiment of the present application, the digital interface control module comprises: A CPU system circuit configured to realize data processing, logical operation and instruction generation, so as to realize intelligent control of the entire module; A telemetry acquisition circuit configured to receive the voltage and current telemetry acquired by the bus filter module and the power drive module, perform signal conditioning and analog-to-digital conversion, and then send the signals to the CPU system circuit for processing; A remote control circuit configured to receive external control instructions, decode the instructions, convert the decoded instructions into control signals, and drive the on-off logic of the output switching module and the reference adjustment of the power drive module; A communication circuit configured to upload the telemetry data processed by the CPU system circuit to the integrated electronic system through a communication bus, and receive control instructions from the integrated electronic system, so as to realize information interaction between the power supply system and the outside.

[0015] The present application has the following advantages: (1) The core advantage of the circuit is that the anode power supply, the cathode heating power supply and the cathode ignition power supply are integrated into one, which significantly improves the single machine integration and the overall power density.

[0016] (2) The input power is stabilized through surge suppression and ripple filtering, the impact of bus abnormalities on the subsequent circuit is reduced, and the failure risk of the power conversion module caused by input fluctuations is reduced. At the same time, the preprocessing function reduces the dependence of the subsequent circuit on the tolerance of components, indirectly supports the selection of low-cost components, and adapts to the reliability and cost balance requirements of commercial aerospace. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A schematic diagram of a power supply system in an embodiment of the application is shown; and Figure 2 A circuit block diagram of a power conversion module in an embodiment of the application is shown. DETAILED DESCRIPTION

[0018] In the following description, reference is made to specific embodiments of the application. Those skilled in the art will recognize that the application can be practiced with one or more of the specific details set forth herein. In other instances, well-known structures, materials or operations are not shown or described in detail in order to avoid obscuring aspects of the application. Similarly, like reference numerals refer to like elements throughout. The terminology used

[0019] In the present application, the embodiments are merely intended to illustrate the scheme of the present application, and should not be understood as limiting.

[0020] In this specification, reference to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0021] The application is further illustrated below with reference to the attached drawings in which the specific embodiments are shown.

[0022] Figure 1 A schematic diagram of a power supply system in an embodiment of the application is shown.

[0023] As Figure 1 shown, in an embodiment of the application, a power supply applied to a space electric propulsion system comprises: a bus filter module 100 comprising a bus surge suppression circuit, a power switch control circuit, and a bus telemetry sampling circuit.

[0024] The bus surge suppression circuit is designed by combining a fuse, a common mode inductor, and a filter capacitor, and realizes double suppression of bus surge current and electromagnetic interference through device cooperation; the power switch control circuit receives instructions from a digital interface control module, accurately controls the on-off state of the power bus, and further strengthens the anti-impulse capability of the bus through the opening delay logic of the switch tube and the surge suppression circuit; the bus telemetry sampling circuit collects bus voltage and current telemetry in real time, uploads to the integrated electronic system through the digital interface control module, and provides data support for fault monitoring function, realizes accurate perception and abnormal early warning of the running state of the bus.

[0025] The power conversion module 200 comprises a BUCK circuit, a full-bridge circuit, an anode power supply circuit, a cathode heating power supply circuit and a cathode ignition power supply circuit.

[0026] The BUCK circuit and the full-bridge circuit adopt a cascade design, wherein the output end of the BUCK circuit is not directly connected with a filter capacitor, and a clamping diode is additionally arranged to the input end to optimize energy management; the full-bridge circuit is driven by a PWM signal with a fixed 50% duty cycle, which simplifies the control logic while ensuring stable operation.

[0027] The secondary side of the full-bridge circuit is provided with three groups of independent windings. The anode power supply winding is directly connected with an output switching module after rectification and filtering, and outputs a constant voltage power supply suitable for the anode of the thruster; The cathode heating power supply winding is connected with a BUCK voltage reduction circuit after rectification and filtering, and outputs a stable current through constant current loop closed loop control, and then is connected with the output switching module 300, thereby meeting the cathode heating requirement; The cathode ignition power supply winding is connected with the output switching module 300 after rectification and filtering, and generates a pulse signal through a timer control switch tube, thereby providing a pulse power supply required by the thruster ignition.

[0028] The windings are processed through different post-processing, thereby realizing integrated output of three types of customized power supply by one set of topology, and efficiently supporting the multi-scene working requirement of the thruster.

[0029] In an embodiment of the present application, the power conversion module 200 comprises a BUCK circuit, a full-bridge circuit, an anode filter circuit, a cathode voltage reduction circuit and an ignition control circuit. The BUCK circuit and the full-bridge circuit are in a cascade structure, the output end of the BUCK circuit is not directly connected with a filter capacitor, and a clamping diode is additionally arranged to the input end, and the full-bridge circuit is controlled by a PWM signal with a fixed 50% duty cycle. The secondary side winding of the full-bridge circuit comprises an anode power supply winding, a cathode heating power supply winding and a cathode ignition power supply winding. The anode power supply winding is directly connected with an output switching module after rectification and filtering, the cathode heating power supply winding is connected with a BUCK circuit after rectification and filtering, and is connected with the output switching module after constant current loop control, and the cathode ignition power supply winding is connected with the output switching module after rectification and filtering, and generates a pulse power supply through a timer control switch tube.

[0030] The main topology of the power conversion module 200 is a BUCK current-fed full-bridge topology, and the transformer secondary side has three windings. Using this topology can replace all output inductors with one input inductor, so the circuit volume, cost and switching loss are reduced compared with a typical full-bridge circuit. The full-bridge part does not set a dead zone. Due to the current suppression effect of the front-stage inductor, when the adjacent switch tubes overlap and conduct, no excessive current stress will be generated, which is beneficial to the selection of low-cost MOS devices with low quality grade without significantly affecting the reliability of the single machine. The cathode step-down circuit of the power conversion module is provided by the coupling winding of the main transformer of the full-bridge circuit, and the rear-end cascaded BUCK step-down circuit collects the output current value for constant current control. The input end of the ignition control circuit of the power conversion module is provided by the coupling winding of the main transformer of the full-bridge circuit, and the rear-end cascaded timer control generates a pulse output power supply.

[0031] Figure 2 The circuit block diagram of the power conversion module in an embodiment of the application is shown.

[0032] As shown in Figure 2 , in the embodiment, the power conversion module comprises: a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3, a fourth MOS tube Q4, a fifth MOS tube Q5, a sixth MOS tube Q6, a seventh MOS tube Q7, a first freewheeling diode D1, a second freewheeling diode D2, a first inductor L1, a power transformer L2, a third inductor L3, a first rectifier bridge DB1, a second rectifier bridge DB2, a third rectifier bridge DB3, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4; Wherein the MOS tube gates are connected to the power drive module, and the on-off is controlled through the power drive module; The source of Q1 is connected to the bus filter module, and the drain of Q1 is connected to the first end of L1; The second end of L1 is connected to the source of Q2, and the first end of L1 is connected to the cathode of D1; The anode of D1 is connected to the drain of Q4; The source of Q4 is connected to the first end of L2, and the drain of Q4 is connected to the bus filter module; The second end of L2 is connected to the drain of Q3, and the first end of L2 is connected to the drain of Q2; The source of Q3 is connected to the source of Q2; The source of Q5 is connected to the second end of L2, and the drain of Q5 is connected to the bus filter module; Wherein Q3 and Q5 are located in the primary winding of the transformer, and the secondary winding of the transformer includes an anode power supply circuit, a cathode heating power supply circuit and a cathode ignition power supply circuit.

[0033] The anode power supply circuit comprises a rectifier bridge DB1 and a first capacitor C1; The first end of the DB1 is connected to the secondary winding of the transformer, and the second end of the DB1 is connected to the first end of the C1. The second end of the C1 is connected to the secondary winding of the transformer and the output switching module, and the first end of the C1 is connected to the output switching module.

[0034] The cathode heating power supply circuit comprises a third rectifier bridge DB3, a third capacitor C3, a seventh MOS tube Q7, a second freewheeling diode D2, a third inductor L3 and a fourth capacitor C4. The first end of the DB3 is connected to the secondary winding of the transformer, and the second end of the DB3 is connected to the first end of the C3. The second end of the C3 is connected to the secondary winding of the transformer, and the first end of the C3 is connected to the drain of the Q7. The source of the Q7 is connected to the cathode of the D2. The anode of the D2 is connected to the second end of the C3, and the cathode of the D2 is connected to the first end of the L3. The second end of the L3 is connected to the first end of the C4 and the output switching module. The second end of the C4 is connected to the anode of the D2 and the output switching module.

[0035] The cathode ignition power supply circuit comprises a second rectifier bridge DB2, a second capacitor C2 and a sixth MOS tube Q6. The first end of the DB2 is connected to the secondary winding of the transformer, and the second end of the DB2 is connected to the first end of the C2. The second end of the C2 is connected to the secondary winding of the transformer and the output switching module. The drain of the Q6 is connected to the first end of the C2, and the source of the Q6 is connected to the output switching module.

[0036] The output switching module 300 comprises an anode switching circuit, a cathode heating switching circuit and a cathode ignition switching circuit. All of them follow a unified control logic: after receiving the instruction signal sent by the digital interface control module, signal isolation and level conversion are realized through an isolation chip, and the on-off of the corresponding switching switch (anode, cathode heating, cathode ignition switch) is driven, so as to accurately control the output time sequence of the three types of power supply (anode power supply, cathode heating power supply, cathode ignition power supply) to the thruster.

[0037] Through the independent switching circuit design, the accurate controllability of the output of each power supply is guaranteed, and the electrical isolation of different power supply loops is realized, which effectively avoids mutual interference and provides reliable support for the orderly start of the thruster according to the logic of “ignition→heating→anode power supply”.

[0038] The power driving module 400, Figure 1The control quantity acquisition circuit, the loop control circuit and the power device driving circuit are integrated in the power conversion module 200.

[0039] The control quantity acquisition circuit converts the high-voltage controlled quantity signal (such as output voltage and current) referenced to the power into a low-voltage signal referenced to the control through differential amplification processing, and synchronously transmits the low-voltage signal to the loop control circuit and the digital interface control module, thereby providing basic data for closed-loop regulation and supporting state monitoring.

[0040] The loop control circuit receives the converted low-voltage analog signal, compares the low-voltage analog signal with a preset reference signal, and completes loop compensation, and then inputs the loop control circuit into a PWM control chip to generate an adaptive PWM control signal, thereby realizing precise regulation of the power output.

[0041] The power device driving circuit is responsible for signal isolation and adaptation: the signal output by the PWM control chip is directly converted into a driving signal for driving the switch tube of the BUCK circuit through an isolation transformer; and after duty cycle compensation, a fixed 50% duty cycle driving signal is output by the isolation transformer to specifically drive the switch tube of the full-bridge circuit.

[0042] Through the cooperation of the three-stage circuit, the complete link of "signal acquisition→closed-loop regulation→power driving" is realized, which not only guarantees the isolation safety of high-voltage and low-voltage circuits, but also precisely controls the switching action of the power conversion module to support stable power output.

[0043] The digital interface control module 500 includes a CPU system circuit, a telemetry acquisition circuit, a remote control circuit and a communication circuit.

[0044] The CPU system circuit, as the control center of the module, integrates core elements such as CPU, crystal oscillator, watchdog chip and memory chip, and provides basic hardware support for data processing, logical operation and instruction generation to ensure stable operation of the module.

[0045] The telemetry acquisition circuit realizes polling acquisition of multi-channel telemetry through a multiplexer, and converts analog signals into digital signals through an analog-to-digital converter after optimizing signal quality through a signal conditioning circuit, thereby providing the CPU with real-time running state data (such as voltage and current) of each module.

[0046] The remote control circuit receives the control signal output by the CPU, analyzes the logical instructions through a decoding circuit, and then converts the instructions into adaptive signals such as OC, OE and TTL through an instruction driving circuit, thereby accurately driving the switching action of the output switching module and realizing timing control of the power output.

[0047] The communication circuit serves as an interaction bridge between the module and the outside, supports uploading of telemetry data to the integrated electronic system and reception of external control instructions, and realizes remote monitoring and regulation of the power system.

[0048] Through the cooperation of each sub-circuit, the module builds a complete control link of "data acquisition -> logic processing -> instruction output -> external interaction", and becomes the core hub of intelligent operation and accurate scheduling of the system.

[0049] Although the embodiments of the present application are described above, it should be understood that they are presented only as examples, not as limitations. It is obvious to those skilled in the relevant art that various combinations, modifications and changes can be made without departing from the spirit and scope of the present application. Therefore, the breadth and scope of the present application disclosed herein should not be limited by the above disclosed exemplary embodiments, but should only be defined according to the appended claims and their equivalent replacements.

Claims

1. A power supply for use in a space electric propulsion system, characterized in that, include: The bus filter module is configured to receive the primary bus power supply from the satellite, convert and filter it, and then output it to the power conversion module. The power conversion module is configured to convert the input power into anode constant voltage, cathode heating constant current and cathode ignition pulse power, and output it to the output switching module. The output switching module is configured to receive timing instructions from the digital interface control module and control the three types of power supplies to be output in sequence. The power drive module is configured to receive the reference signal from the digital interface control module and the feedback from the power conversion, and generate a PWM drive signal to regulate the power conversion module. as well as The digital interface control module is configured to receive external commands and telemetry data from various modules, output a reference to the power drive module, output a timing sequence to the output switching module, and simultaneously upload telemetry data.

2. The power supply for a space electric propulsion system according to claim 1, characterized in that, The power conversion module includes: An anode power supply circuit is configured to control the on / off state of the anode power supply output according to instructions. The cathode heating power supply circuit is configured to control the on / off state of the cathode heating power supply output. The cathode ignition power supply circuit is configured to control the on / off state of the cathode ignition power supply output.

3. The power supply for a space electric propulsion system according to claim 2, characterized in that, The power conversion module includes: MOSFET Q1, MOSFET Q2, MOSFET Q3, MOSFET Q4, MOSFET Q5, MOSFET Q6, MOSFET Q7, freewheeling diode D1, freewheeling diode D2, inductor L1, power transformer L2, inductor L3, rectifier bridge DB1, rectifier bridge DB2, rectifier bridge DB3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, transformer; The gates of the MOSFETs are all connected to the power drive module, and the power drive module controls their on / off state. The source of the first MOSFET Q1 is connected to the bus filter module, and the drain of the first MOSFET Q1 is connected to the first terminal of the first inductor L1. The second end of the first inductor L1 is connected to the source of the second MOSFET Q2, and the first end of the first inductor L1 is connected to the cathode of the first freewheeling diode D1. The anode of the first freewheeling diode D1 is connected to the drain of the fourth MOSFET Q4; The source of the fourth MOSFET Q4 is connected to the first terminal of the power transformer L2, and the drain of the fourth MOSFET Q4 is connected to the bus filter module. The second terminal of power transformer L2 is connected to the drain of the third MOSFET Q3, and the first terminal of power transformer L2 is connected to the drain of the second MOSFET Q2. The source of the third MOSFET Q3 is connected to the source of the second MOSFET Q2; The source of the fifth MOSFET Q5 is connected to the second terminal of the power transformer L2, and the drain of the fifth MOSFET Q5 is connected to the bus filter module. The third MOSFET Q3 and the fifth MOSFET Q5 are located in the primary winding of the transformer. The secondary winding of the transformer includes the anode power supply circuit, the cathode heating power supply circuit, and the cathode ignition power supply circuit.

4. The power supply for a space electric propulsion system according to claim 3, characterized in that, The anode power supply circuit includes a rectifier bridge DB1 and a first capacitor C1; The first end of the rectifier bridge DB1 is connected to the secondary winding of the transformer, and the second end of the rectifier bridge DB1 is connected to the first end of the first capacitor C1. The second terminal of the first capacitor C1 is connected to the secondary winding of the transformer and the output switching module, while the first terminal of the first capacitor C1 is connected to the output switching module.

5. The power supply for a space electric propulsion system according to claim 3, characterized in that, The cathode heating power supply circuit includes a third rectifier bridge DB3, a third capacitor C3, a seventh MOSFET Q7, a second freewheeling diode D2, a third inductor L3, and a fourth capacitor C4. Among them, the first end of the third rectifier bridge DB3 is connected to the secondary winding of the transformer, and the second end of the third rectifier bridge DB3 is connected to the first end of the third capacitor C3. The second terminal of the third capacitor C3 is connected to the secondary winding of the transformer, and the first terminal of the third capacitor C3 is connected to the drain of the seventh MOSFET Q7. The source of the seventh MOSFET Q7 is connected to the cathode of the second freewheeling diode D2; The anode of the second freewheeling diode D2 is connected to the second terminal of the third capacitor C3, and the cathode of the second freewheeling diode D2 is connected to the first terminal of the third inductor L3. The second terminal of the third inductor L3 is connected to the first terminal of the fourth capacitor C4 and the output switching module; The second terminal of the fourth capacitor C4 is connected to the anode of the second freewheeling diode D2 and the output switching module.

6. The power supply for a space electric propulsion system according to claim 3, characterized in that, The cathode ignition power supply circuit includes a second rectifier bridge DB2, a second capacitor C2, and a sixth MOSFET Q6; The first end of the second rectifier bridge DB2 is connected to the secondary winding of the transformer, and the second end of the second rectifier bridge DB2 is connected to the first end of the second capacitor C2. The second terminal of the second capacitor C2 is connected to the secondary winding of the transformer and the output switching module; The drain of the sixth MOSFET Q6 is connected to the first terminal of the second capacitor C2, and the source of the sixth MOSFET Q6 is connected to the output switching module.

7. The power supply for a space electric propulsion system according to claim 1, characterized in that, The bus filter module includes: The bus surge suppression circuit is configured to protect downstream circuits by suppressing surge current, thus preventing bus abnormalities from impacting the power conversion module. The power switch control circuit is configured to control the on / off state of the bus input. Through logic such as the turn-on delay of the switching transistor, the timing control and surge suppression of the bus input are coordinated. The bus telemetry sampling circuit is configured to collect remote measurements of bus voltage and current and send the data to the digital interface control module.

8. The power supply for a space electric propulsion system according to claim 1, characterized in that, The output switching module includes: An anode switching circuit is configured to control the on / off state of the anode power supply output. The cathode heating switching circuit is configured to control the on / off state of the cathode heating power supply output. The cathode ignition switching circuit is configured to control the on / off state of the cathode ignition power supply output.

9. The power supply for a space electric propulsion system according to claim 1, characterized in that, The power drive module includes: The control signal acquisition circuit is configured to acquire the output voltage and current of the anode constant voltage power supply, the cathode heating cross current power supply, and the cathode ignition pulse power supply, convert the acquired signals into signals that are compatible with the control circuit, and send them synchronously to the loop control circuit and the digital interface control module. The loop control circuit is configured to receive the signal from the control quantity acquisition circuit, perform loop compensation with the reference signal, and output the corresponding PWM control signal. The power device drive circuit is configured to isolate and drive the PWM control signal output by the loop control circuit, providing a drive signal for the power conversion module.

10. The power supply for a space electric propulsion system according to claim 1, characterized in that, The digital interface control module includes: The CPU system circuit is configured to perform data processing, logical operations, and instruction generation in order to achieve intelligent control of the entire module. The telemetry acquisition circuit is configured to receive voltage and current telemetry data acquired by the bus filter module and the power drive module, perform signal conditioning and analog-to-digital conversion, and then send the data to the CPU system circuit for processing. The remote control circuit is configured to receive external control commands, decode them, convert them into control signals, and drive the on / off logic of the output switching module and the reference adjustment of the power drive module. The communication circuit is configured to upload telemetry data processed by the CPU system circuit to the integrated electronic system via the communication bus, and at the same time receive control commands from the integrated electronic system to realize information interaction between the power supply system and the outside world.

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