Cathode heating ignition power supply

Abstract

The utility model relates to the technical field of ignition power sources, and discloses a cathode heating ignition power source which comprises a main control module, a voltage transformation module, an acquisition module and an isolation module, the main control module comprises a main controller U1, and the voltage transformation module comprises an input suppression circuit, a control circuit and a voltage transformation circuit. The control circuit is connected with the main controller U1 through the isolation module, the acquisition module comprises a current acquisition circuit and a first isolation circuit, the current acquisition circuit is connected between the voltage transformation circuit and the main controller U1, and the first isolation circuit is connected between the current acquisition circuit and the main controller U1; the main controller U1 is isolated from the primary side and the secondary side, so that the switching peak of the mos transistor is prevented from interfering with the work of the main controller U1 to realize high-stability constant-current control, the high-stability constant-current control circuit is used for an aerospace satellite power system and has anti-radiation capability, and the optical coupler, the mos transistor and the power diode which are used are all made of silicon carbide materials.

Description

Technical Field

[0001] The utility model relates to the technical field of ignition power supplies, in particular to a cathode heating ignition power supply. Background Art

[0002] Space electric propulsion technology is a power technology that converts spacecraft electrical energy into kinetic energy. Its working principle is that the thruster ionizes the gas working fluid and accelerates the ions through a high-voltage electric field to generate thrust. With the continuous development of electric propulsion technology and the deepening of space applications, the space missions that electric propulsion can perform are constantly expanding. As one of the current mainstream space electric propulsion technologies, ion electric propulsion technology has achieved core key indicators such as high specific impulse and high efficiency thanks to the special grid structure of the thruster and the combined effect of the PPU high-voltage power supply. At the same time, through the precise adjustment of the PPU power supply parameters and the storage and supply gas parameters, it has the advantage of precise adjustment of the output thrust over a wide range, and has been widely used in the current spacecraft's position keeping and orbit change missions. Among them, a cathode heating ignition power supply is set in the PPU power supply structure of the ion electric propulsion system to achieve its required power supply requirements. The existing cathode heating ignition power supply has the problem of unstable output and spike interference. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a cathode heating ignition power supply.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A cathode heating ignition power supply comprises a main control module, a voltage transformation module, a collection module and an isolation module, wherein the main control module comprises a main controller U1, the voltage transformation module comprises an input suppression circuit, a control circuit and a voltage transformation circuit, the control circuit is connected to the main controller U1 via the isolation module, the collection module comprises a current collection circuit and a first isolation circuit, the current collection circuit is connected between the voltage transformation circuit and the main controller U1, and the first isolation circuit is connected between the current collection circuit and the main controller U1.

[0006] In the present utility model, preferably, the transformer module also includes a voltage stabilizing circuit, which includes capacitors C19 and C22, a diode D11, a resistor RT2 and a fuse FD1 in parallel, and a diode D5 is also connected in series between the parallel circuit of the capacitor C22 and the diode D11.

[0007] In the utility model, preferably, the input suppression circuit includes an interface CN1, port No. 1 of the interface CN1 is connected in series with the circuit breaker F1 and then connected to the No. 1 end of the inductor L2, a series branch including the circuit breaker F2 and the resistor R1 is connected in parallel at both ends of the circuit breaker F1, a capacitor C8 and a thermistor RT1 are connected in parallel between the No. 1 and No. 2 ends of the inductor L2, a capacitor C4 is connected in parallel with the No. 3 and No. 4 ports of the inductor L2, and a series branch including resistors R30, R36, R3, R6 and a MOS tube Q5 is also connected in parallel, and a diode D9, a capacitor C14 and a resistor R9 are connected in parallel at both ends of the MOS tube Q5.

[0008] In the present utility model, preferably, the control circuit includes MOS tubes Q1, Q2, Q3 and Q4, and the ports 8-10 of the MOS tubes Q1 and Q2, and the ports 2-7 of the MOS tubes Q3 and Q4 are connected in series and then connected to the input suppression circuit, the ports 2-7 of the MOS tube Q1 are connected to the transformer T4, the port 1 of the MOS tube Q1 is connected in series with the resistor R2 and then connected to the isolation module, the ports 2-7 of the MOS tube Q2 are connected to the transformer T1, and the resistor R2 is connected to the isolation module. Port No. 1 of the MOS tube Q2 is connected in series with resistor R4 and then connected to the isolation module, ports No. 8-10 of the MOS tube Q3 are connected to ports No. 2-7 of the MOS tube Q2, and at the same time, resistor R12 is connected in series with port No. 1 of the MOS tube Q2, ports No. 8-10 of the MOS tube Q4 are connected to ports No. 2-7 of the MOS tube Q1, and resistor R13 is connected in series with port No. 1 of the MOS tube Q1, and ports No. 1 of the MOS tubes Q3 and Q4 are respectively connected in series with resistors R10 and R8 and then connected to the isolation module.

[0009] In the utility model, preferably, the transformer circuit includes transformers T1, T2 and T4, transformer T4 is connected to one end of transformer T2, port No. 2 of transformer T4 is connected in series with diode D13 and then connected to the main controller U1, transformers T1 and T2 are connected in series, and the output sides of transformers T1 and T2 are respectively connected with diodes D1, D2, D6 and D7, wherein diodes D2 and D7 are reversely connected, and capacitors C15-C21 are also connected in parallel on the output sides of transformers T1 and T2, and the output side of transformer T2 is connected in series with diode D1 and inductor L3 and then connected to a parallel branch including capacitors C15-C21, and then connected to the suppression circuit.

[0010] In the utility model, preferably, the isolation module includes isolators IC1 and IC2, and ports No. 1 and No. 2 of the isolators IC1 and IC2 are respectively connected in series with resistors R21, R17, R57, and R68 and then connected to the main controller U1, and a series branch including capacitors C24 and C31 is connected in parallel between ports No. 14 and No. 16 of the isolator IC1, port No. 16 is connected to the VCCA power supply, and port No. 14 is connected to the ground, and resistor R87 is also connected in parallel at both ends of the capacitor C24, and diode D18 is connected in parallel at both ends of the capacitor C31.

[0011] In the present utility model, preferably, the current acquisition circuit includes a resistor R46 and a collector IC3, the resistor R46 is connected in series to the output side branch of the transformer T1, and at both ends of the resistor R46 are respectively connected in series with a resistor R67 and a resistor R15 and then connected to the collector IC3, and the collector IC3 is connected in series to the first isolation circuit.

[0012] In the utility model, preferably, the first isolation circuit includes an isolator IC9, and the No. 4 and No. 5 input terminals of the isolator IC9 are respectively connected in series with resistors R94 and R95 and then connected to the collector IC3, and the No. 6 output terminal of the isolator IC9 is connected in series with resistors R23 and R28 and then connected to the negative input terminal of the operational amplifier U3B. At the same time, the negative input terminal of the operational amplifier U3B is connected in series with resistor R24, capacitor C42, and diode D17 and then connected to the main controller U1, and capacitor C40 is also connected in parallel at both ends of the series branch of the resistor R24 ​​and capacitor C42.

[0013] In the present utility model, preferably, the positive input terminal of the operational amplifier U3B is connected in series with a resistor R39 and then connected to a digital-to-analog converter IC6, and the input terminal of the digital-to-analog converter IC6 is connected to an isolator IC5.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The main controller of the power supply of the utility model drives four MOS tubes to conduct alternately through an isolation module, thereby controlling the transformer to realize DC to AC conversion, and collecting current signals at the secondary side of the transformer for sampling to form a stable current loop to realize constant current source control. The main controller U1 and the primary side secondary measurement are both in isolation form, avoiding the switching spikes of the MOS tube interfering with the work of the main controller U1 to realize high-stability constant current control. It is used in aerospace satellite power systems and has radiation resistance. The optocouplers, MOS tubes, and power diodes used are all made of silicon carbide. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural block diagram of a cathode heating ignition power supply described in the utility model.

[0017] Figure 2The utility model is a circuit diagram of a cathode heating ignition power supply. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] Please also see Figure 1 to Figure 2 A preferred embodiment of the utility model provides a cathode heating ignition power supply, which adopts a full-bridge topology structure, and the input is configured with a current surge suppression circuit. The main controller adopts a phase-shifted full-bridge controller, and drives four MOS tubes to conduct alternately through an isolation module, thereby controlling the transformer to achieve DC conversion to AC, and collecting current signals at the secondary side of the transformer for sampling to form a current stabilization loop to achieve constant current source control. The main controller is isolated from the primary and secondary sides of the transformer, avoiding the switching spikes of the MOS tube interfering with the operation of the main controller, and achieving high-stability constant current.

[0022] The power supply specifically includes a main control module, a transformer module, a collection module and an isolation module. The main control module includes a main controller U1. The transformer module includes an input suppression circuit, a control circuit and a transformer circuit. The control circuit is connected to the main controller U1 through the isolation module. The collection module includes a current collection circuit and a first isolation circuit. The current collection circuit is connected between the transformer circuit and the main controller U1. The first isolation circuit is connected between the current collection circuit and the main controller U1.

[0023] In this embodiment, the voltage conversion module further includes a voltage stabilizing circuit, which includes capacitors C19 and C22 connected in parallel, a diode D11, a resistor RT2 and a fuse FD1, and a diode D5 is further connected in series between the parallel circuit of the capacitor C22 and the diode D11.

[0024] In this embodiment, the input suppression circuit includes an interface CN1, wherein port No. 1 of the interface CN1 is connected in series with a circuit breaker F1 and then connected to terminal No. 1 of an inductor L2, a series branch including a circuit breaker F2 and a resistor R1 is connected in parallel at both ends of the circuit breaker F1, a capacitor C8 and a thermistor RT1 are connected in parallel between terminals No. 1 and No. 2 of the inductor L2, a capacitor C4 is connected in parallel with terminals No. 3 and No. 4 of the inductor L2, and capacitors CC5, C6, C7, C9-C11, C2, C3, C132-C134 are also connected in parallel, wherein an inductor L1 is connected in series between capacitors C6 and C7, and a series branch including resistors R30, R36, R3, R6 and a MOS tube Q5 is also connected in parallel, and a diode D9, a capacitor C14 and a resistor R9 are connected in parallel at both ends of the MOS tube Q5.

[0025] In this embodiment, the control circuit includes MOS transistors Q1, Q2, Q3 and Q4, and the ports 8-10 of the MOS transistors Q1 and Q2, and the ports 2-7 of the MOS transistors Q3 and Q4 are connected in series and then connected to the input suppression circuit. Specifically, the inductor L1 is connected in series and then connected to the port 4 of the inductor L2. The ports 2-7 of the MOS transistor Q1 are connected to the transformer T4, the port 1 of the MOS transistor Q1 is connected in series with the resistor R2 and then connected to the isolation module, and the two ends of the resistor R2 are also connected in parallel with a diode D3, and the ports 2-7 of the MOS transistor Q2 are connected in series with the resistor R2. The first port of the MOS tube Q3 is connected to the transformer T1, the first port of the MOS tube Q2 is connected in series with the resistor R4 and then connected to the isolation module, the two ends of the resistor R4 are also connected in parallel with a diode D4, the 8-10 ports of the MOS tube Q3 are connected to the 2-7 ports of the MOS tube Q2, and the 8-10 ports of the MOS tube Q4 are connected to the 2-7 ports of the MOS tube Q1, and the first port of the MOS tube Q1 is connected in series with the resistor R13, and the first port of the MOS tube Q3 and the MOS tube Q4 are connected in series with the resistors R10 and R8 respectively and then connected to the isolation module.

[0026] In this embodiment, the transformer circuit includes transformers T1, T2 and T4, transformer T4 is connected to one end of transformer T2, port No. 2 of transformer T4 is connected in series with diode D13 and then connected to the main controller U1, transformers T1 and T2 are connected in series, and the output sides of transformers T1 and T2 are respectively connected with diodes D1, D2, D6 and D7, wherein diodes D2 and D7 are reversely connected, and capacitors C15-C21 are also connected in parallel to the output sides of transformers T1 and T2, and the output side of transformer T2 is connected in series with diode D1 and inductor L3 and then connected to a parallel branch including capacitors C15-C21, and then connected to the suppression circuit.

[0027] In this embodiment, the isolation module includes isolators IC1 and IC2, and ports 1 and 2 of the isolators IC1 and IC2 are respectively connected in series with resistors R21, R17, R57, and R68 and then connected to the main controller U1. A series branch including capacitors C24 and C31 is connected in parallel between ports 14 and 16 of the isolator IC1, port 16 is connected to the VCCA power supply, and port 14 is connected to the ground. Resistor R87 is also connected in parallel at both ends of the capacitor C24, and diode D18 is connected in parallel at both ends of the capacitor C31. The connection structure of the isolator IC2 is the same as that of the isolator IC1.

[0028] Specifically, direct current is connected through the interface CN1, and the input current is surge suppressed by the input suppression circuit, and then converted into a direct current voltage by transformers T1 and T2, and then output from the interface CN2 after being stabilized by the voltage stabilizing circuit, wherein the transformers T1 and T2 are connected with a control circuit, and the control circuit is connected to the main controller U1. The main controller U1 outputs a control signal and is isolated by isolators IC1 and IC2. The isolated analog signal is compared with a preset reference to adjust the duty cycle of the PWM drive signal, and drive the MOS tubes Q1, Q2, Q3 and Q4 to be turned on alternately, thereby controlling the size of the direct current voltage converted by the transformers T1 and T2.

[0029] In this embodiment, the current collection circuit includes a resistor R46 and a collector IC3. The resistor R46 is connected in series to the output side branch of the transformer T1. At the same time, the two ends of the resistor R46 are respectively connected in series with resistors R67 and R15 and then connected to the collector IC3. The collector IC3 is connected in series to the first isolation circuit.

[0030] In this embodiment, the first isolation circuit includes an isolator IC9, and the input terminals No. 4 and No. 5 of the isolator IC9 are connected in series with resistors R94 and R95 respectively, and then connected to the collector IC3. The output terminal No. 6 of the isolator IC9 is connected in series with resistors R23 and R28, and then connected to the negative input terminal of the operational amplifier U3B. The current preset analog signal input from the outside of IC6 is sent to the same direction input terminal of U3. When the reverse end current signal is higher than the preset current signal, the output terminal of the operational amplifier becomes low. At the same time, the negative input terminal of the operational amplifier U3B is connected in series with resistor R24, capacitor C42, and diode D17, and then connected to the output terminal of the operational amplifier inside the main controller U1, and pulled down. At this time, the duty cycle of the signal driving the MOS tube output by U1 becomes lower, and the output voltage / current becomes lower, so as to realize the current loop stabilization. The resistor R24 ​​and capacitor C42 series branch are also connected in parallel with capacitor C40 at both ends.

[0031] In this embodiment, the positive input terminal of the operational amplifier U3B is connected in series with a resistor R39 and then connected to a digital-to-analog converter IC6. The input terminal of the digital-to-analog converter IC6 is connected to an isolator IC5. The function of this circuit is to convert an external input 5V1Khz 0-100% duty cycle signal to a 0-8A current preset value. The IC6 converts the signal into a preset reference signal of a 0-4V analog quantity signal, and IC5 can realize the isolation function of the external input signal and the main control circuit.

[0032] The secondary of transformers T1 and T2 is converted into DC voltage after rectification by diodes D1, D2, D6, and D7. The current signal is fed back to the main controller U1 through the collector IC3 to realize isolated sampling, forming a stable current loop to realize constant current source control. The main controller U1 and the secondary measurement on the primary side are both isolated, avoiding the switching spike of the MOS tube interfering with the operation of the main controller U1 to achieve high-stability constant current control. It is used in aerospace satellite power systems and has radiation resistance. The optocouplers, MOS tubes, and power diodes used are all made of silicon carbide.

[0033] The above description is a detailed description of the preferred feasible embodiment of the utility model, but the embodiment is not used to limit the scope of the patent application of the utility model. All equivalent changes or modified changes completed under the technical spirit suggested by the utility model should fall within the patent scope covered by the utility model.

Claims

1. A cathode heating ignition power supply, characterized in that: It includes a main control module, a voltage transformation module, a collection module and an isolation module. The main control module includes a main controller U1. The voltage transformation module includes an input suppression circuit, a control circuit and a voltage transformation circuit. The control circuit is connected to the main controller U1 through the isolation module. The collection module includes a current collection circuit and a first isolation circuit. The current collection circuit is connected between the voltage transformation circuit and the main controller U1. The first isolation circuit is connected between the current collection circuit and the main controller U1.

2. A cathode heating ignition power supply according to claim 1, characterized in that: The voltage conversion module further includes a voltage stabilizing circuit, which includes capacitors C19 and C22 connected in parallel, a diode D11, a resistor RT2 and a fuse FD1. A diode D5 is further connected in series between the parallel circuit of the capacitor C22 and the diode D11.

3. A cathode heating ignition power supply according to claim 2, characterized in that: The input suppression circuit includes an interface CN1, wherein port No. 1 of the interface CN1 is connected in series with a circuit breaker F1 and then connected to terminal No. 1 of an inductor L2, a series branch including a circuit breaker F2 and a resistor R1 is connected in parallel at both ends of the circuit breaker F1, a capacitor C8 and a thermistor RT1 are connected in parallel between terminals No. 1 and No. 2 of the inductor L2, a capacitor C4 is connected in parallel with terminals No. 3 and No. 4 of the inductor L2, and a series branch including resistors R30, R36, R3, R6 and a MOS tube Q5 is also connected in parallel, and a diode D9, a capacitor C14 and a resistor R9 are connected in parallel at both ends of the MOS tube Q5.

4. A cathode heating ignition power supply according to claim 1, characterized in that: The control circuit includes MOS transistors Q1, Q2, Q3 and Q4. Ports 8-10 of the MOS transistors Q1 and Q2, and ports 2-7 of the MOS transistors Q3 and Q4 are connected in series and then connected to the input suppression circuit. Ports 2-7 of the MOS transistor Q1 are connected to a transformer T4. Port 1 of the MOS transistor Q1 is connected in series with a resistor R2 and then connected to the isolation module. Ports 2-7 of the MOS transistor Q2 are connected to the transformer T1. Port 1 of the MOS transistor Q2 is connected in series with a resistor R4 and then connected to the isolation module. Ports 8-10 of the MOS transistor Q3 are connected to ports 2-7 of the MOS transistor Q2, and resistor R12 is connected in series with port 1 of the MOS transistor Q2. Ports 8-10 of the MOS transistor Q4 are connected to ports 2-7 of the MOS transistor Q1, and resistor R13 is connected in series with port 1 of the MOS transistor Q1. Ports 1 of the MOS transistors Q3 and Q4 are connected in series with resistors R10 and R8, respectively, and then connected to the isolation module.

5. A cathode heating ignition power supply according to claim 4, characterized in that: The transformer circuit includes transformers T1, T2 and T4, transformer T4 is connected to one end of transformer T2, port No. 2 of transformer T4 is connected in series with diode D13 and then connected to the main controller U1, transformers T1 and T2 are connected in series, and the output sides of transformers T1 and T2 are respectively connected with diodes D1, D2, D6 and D7, wherein diodes D2 and D7 are reversely connected, and capacitors C15-C21 are also connected in parallel to the output sides of transformers T1 and T2, and the output side of transformer T2 is connected in series with diode D1 and inductor L3 and then connected to a parallel branch including capacitors C15-C21, and then connected to the suppression circuit.

6. A cathode heating ignition power supply according to claim 4, characterized in that: The isolation module includes isolators IC1 and IC2. Ports 1 and 2 of the isolators IC1 and IC2 are respectively connected in series with resistors R21, R17, R57, and R68 and then connected to the main controller U1. A series branch including capacitors C24 and C31 is connected in parallel between ports 14 and 16 of the isolator IC1. Port 16 is connected to a VCCA power supply, and port 14 is connected to a ground terminal. Resistor R87 is also connected in parallel at both ends of the capacitor C24, and diode D18 is connected in parallel at both ends of the capacitor C31.

7. A cathode heating ignition power supply according to claim 1, characterized in that: The current collection circuit includes a resistor R46 and a collector IC3. The resistor R46 is connected in series to the output branch of the transformer T1. Both ends of the resistor R46 are connected in series to a resistor R67 and a resistor R15 respectively and then connected to the collector IC3. The collector IC3 is connected in series to the first isolation circuit.

8. A cathode heating ignition power supply according to claim 7, characterized in that: The first isolation circuit includes an isolator IC9, and input terminals No. 4 and No. 5 of the isolator IC9 are respectively connected in series with resistors R94 and R95 and then connected to the collector IC3. Output terminal No. 6 of the isolator IC9 is connected in series with resistors R23 and R28 and then connected to the negative input terminal of the operational amplifier U3B. At the same time, the negative input terminal of the operational amplifier U3B is connected in series with resistor R24, capacitor C42 and diode D17 and then connected to the main controller U1. Capacitor C40 is also connected in parallel at both ends of the series branch of the resistor R24 ​​and capacitor C42.

9. A cathode heating ignition power supply according to claim 8, characterized in that: The positive input terminal of the operational amplifier U3B is connected in series with a resistor R39 and then connected to a digital-to-analog converter IC6. The input terminal of the digital-to-analog converter IC6 is connected to an isolator IC5.

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