Screen grid high-voltage power supply

Abstract

The utility model relates to the technical field of high-voltage circuits, and discloses a screen grid high-voltage power supply, which comprises a master controller IC4, a control circuit and an acquisition conversion circuit, the control circuit and the acquisition conversion circuit are connected with the master controller IC4, the control circuit is connected in a voltage conversion circuit, the voltage conversion circuit comprises a transformer T2, the control circuit is connected on a primary side of the transformer T2, and the acquisition conversion circuit is connected on a secondary side of the transformer T2. The acquisition conversion circuit is connected to the secondary side of the transformer T2, the control circuit comprises a switching tube Q4 and a switching tube Q8, and the switching tube Q4 and the switching tube Q8 are gallium nitride switching tubes and are connected between the master controller IC4 and the transformer T2. Alternating conduction of the gallium nitride switch tubes Q8 and Q4 is controlled by the controller, so that boosting of the transformer T2 is realized, stable high-voltage electricity is output, closed-loop voltage control is realized by collecting current on the output side of the transformer T2, the output voltage is stable, the whole circuit structure is simple, and the circuit is suitable for the satellite ion thruster.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage circuits, in particular to a screen grid high-voltage power supply. Background Art

[0002] Satellite ion thrusters are a type of propulsion system that uses ionized gas to generate thrust. They are characterized by high thrust efficiency and high speed. However, they have high voltage requirements during operation, requiring the voltage to reach a certain intensity, with strong voltage stability and small voltage difference. The existing high-voltage power supply circuit conversion is relatively complex, the voltage control feedback is time-consuming, and the precision control is relatively cumbersome. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a screen grid high voltage power supply.

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

[0005] A screen grid high-voltage power supply includes a main controller IC4 and a control circuit and a collection and conversion circuit connected to the main controller IC4. The control circuit is connected to the voltage conversion circuit, and the voltage conversion circuit includes a transformer T2. The control circuit is connected to the primary side of the transformer T2, and the collection and conversion circuit is connected to the secondary side of the transformer T2. The control circuit includes a switch tube Q4 and a switch tube Q8. The switch tube Q4 and the switch tube Q8 are gallium nitride switch tubes, which are connected between the main controller IC4 and the transformer T2.

[0006] In the present invention, preferably, a resistor R10 and a resistor R19 are connected in series between the main controller IC4 and the switch tube Q4 and the switch tube Q8, respectively. Diodes DZ1 and DZ2 are connected in parallel at both ends of the resistor R10 and the resistor R19, respectively.

[0007] In the present invention, preferably, the drain of the switch tube Q4 is connected to the primary end of the transformer T2, the source is connected in series with the resistor R34 and then connected to the ground end, and the drain of the switch tube Q8 is connected to the other primary end of the transformer T2, the source is connected in series with the resistor R34 and then connected to the ground end.

[0008] In the present invention, preferably, a resistor R124 and an inductor L6 are connected in series between the transformer T2 and the power input end, a capacitor C20 is connected in series between the resistor R124 and the inductor L6 and then connected to the ground end, and the input end is also connected in parallel with capacitors C21, C16, C22, C17 and C171, and a full-bridge rectifier circuit is connected in parallel at both ends of the secondary side of the transformer T2.

[0009] In the present invention, preferably, the full-bridge rectifier circuit includes a diode D3 and a diode D7, a diode D4 and a diode D8 connected in series, followed by an inductor L1, a diode D1 and a diode D2 connected in series, and a diode D12 and a diode D14, a diode D13 and a diode D15 are respectively connected in series between the two ends of the secondary side of the transformer T2 and the ground terminal.

[0010] In the present invention, preferably, one end of the secondary side of the transformer T2 is connected in series with the inductor L1, the diode D1 and the diode D2 and then connected to the output end, one end of the secondary side of the transformer T2 is connected in series with the resistor R16 and then connected to the ground end, and capacitors C10, C13 and capacitor C14 are also connected in parallel between the two ends of the secondary side of the transformer T2 respectively.

[0011] In the present utility model, preferably, the acquisition and conversion circuit includes an amplifier IC7 and an amplifier IC12, and ports 6 and 7 of the amplifier IC7 are respectively connected in series with resistors R25 and R26 and then connected to both ends of the resistor R16, and ports 10 and 11 of the amplifier IC7 are respectively connected in series with resistors R40 and R41 and then connected to IC9.

[0012] In the present invention, preferably, port No. 6 of the amplifier IC12 is connected in series with resistors R53, R48, R46, R42, R37, R36, and R31, and then connected to one end of the secondary side of the transformer T2. The two ends of the series circuit composed of resistors R48, R46, R42, R37, R36, and R31 are also connected in parallel with a series circuit of resistor R32 and capacitor C44. The series circuit of the resistor R53 and the resistor R48 is also connected to the ground end through a series resistor R58, and the two ends of the resistor R58 are also connected in parallel with diodes DR4 and D7.

[0013] In the present invention, preferably, output terminal No. 6 of the amplifier IC12 is connected in series with a resistor R60 and then connected to port No. 1 of the comparator IC16, and port No. 4 of the comparator IC16 is connected to port No. 2 of the main controller IC4.

[0014] In the present invention, preferably, the No. 3 port of the comparator IC16 is connected in series with a resistor R63 and then connected to the simulator IC19, and the No. 2 port of the simulator IC19 inputs an external 0-100% square wave signal.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The power supply of the utility model adopts a controller to control the alternating conduction of gallium nitride switching tubes Q8 and Q4 to realize transformer T2 voltage boosting and output stable high voltage electricity. The closed-loop voltage control is realized by collecting the output side current of transformer T2, and the output voltage is stable. The overall circuit structure is streamlined and suitable for satellite ion thrusters. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural block diagram of a screen grid high voltage power supply described in the utility model.

[0018] Figure 2 This is a circuit diagram of a screen grid high voltage power supply described in the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] 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 central component. 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 central component. 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 central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Please also see Figure 1 and Figure 2A preferred embodiment of the present invention provides a screen grid high-voltage power supply, which mainly provides stable high voltage electricity for satellite ion thrusters. The stability of the output voltage is ensured by setting a real-time acquisition and control circuit. The high-voltage power supply specifically includes a main controller IC4 and a control circuit and an acquisition conversion circuit connected to the main controller IC4. The control circuit is connected to the voltage conversion circuit. The voltage conversion circuit includes a transformer T2. The control circuit is connected to the primary side of the transformer T2. The acquisition conversion circuit is connected to the secondary side of the transformer T2. The control circuit includes a switch tube Q4 and a switch tube Q8. The switch tube Q4 and the switch tube Q8 are gallium nitride switch tubes, which are connected between the main controller IC4 and the transformer T2. The controller IC4 controls the switch tube Q4 and the switch tube Q8 to alternately conduct by receiving the output voltage transmitted by the acquisition conversion circuit, thereby boosting the input DC12V to 1.5kV output.

[0023] In this embodiment, resistors R10 and R19 are connected in series between the main controller IC4 and the switch tubes Q4 and Q8, respectively. Diodes DZ1 and DZ2 are connected in parallel at both ends of the resistors R10 and R19, respectively. The parallel circuit of the resistors and diodes protects the switch tubes and eliminates oscillation signals.

[0024] In this embodiment, the drain of the switch Q4 is connected to the primary terminal of the transformer T2, the source is connected in series with a resistor R34, and then connected to ground. The drain of the switch Q8 is connected to the other terminal of the primary terminal of the transformer T2, the source is connected in series with a resistor R34, and then connected to ground. When the controller IC4 controls the switch Q4 to turn on, the input current flows through terminals 3 and 1 of the transformer T2, then through the switch Q4, and finally into ground. When the switch Q8 is turned on, terminals 3 and 6 of the transformer T2 are turned on.

[0025] In this embodiment, a resistor R124 and an inductor L6 are further connected in series between the transformer T2 and the power input terminal. A capacitor C20 is connected in series between the resistor R124 and the inductor L6 and then connected to the ground terminal. The input terminal is further connected in parallel with capacitors C21, C16, C22, C17, and C171. Capacitors C21, C16, C22, C17, and C171 filter the input current to ensure the stability of the input current. A full-bridge rectifier circuit is connected in parallel at both ends of the secondary side of the transformer T2. The full-bridge rectifier circuit converts the AC power output by the transformer T2 into DC power.

[0026] Specifically, the full-bridge rectifier circuit includes a diode D3 and a diode D7, a diode D4 and a diode D8 connected in series, followed by an inductor L1, a diode D1 and a diode D2 connected in series. A diode D12 and a diode D14, a diode D13 and a diode D15 are connected in series between the two ends of the secondary side of the transformer T2 and the ground terminal, respectively.

[0027] In this embodiment, one end of the secondary side of the transformer T2 is connected in series with an inductor L1, a diode D1, and a diode D2, and then connected to the output end. One end of the secondary side of the transformer T2 is connected in series with a resistor R16 and then connected to the ground end. Capacitors C10, C13, and a capacitor C14 are also connected in parallel between the two ends of the secondary side of the transformer T2, respectively. The LC filter circuit composed of the inductor and the capacitor filters the current output by the full-bridge rectifier circuit and outputs stable high-voltage direct current for use by the ion thruster.

[0028] In this embodiment, the acquisition and conversion circuit includes amplifier IC7 and amplifier IC12. Ports 6 and 7 of amplifier IC7 are respectively connected in series with resistors R25 and R26 and then connected to both ends of resistor R16. Ports 10 and 11 of amplifier IC7 are respectively connected in series with resistors R40 and R41 and then connected to collector IC9.

[0029] In this embodiment, port 6 of amplifier IC12 is connected in series with resistors R53, R48, R46, R42, R37, R36, and R31, and then connected to one end of the secondary side of transformer T2. A series circuit consisting of resistors R48, R46, R42, R37, R36, and R31 is further connected in parallel with a series circuit consisting of resistor R32 and capacitor C44. The series circuit of resistors R53 and R48 is further connected to ground via a series resistor R58. Diodes DR4 and D7 are further connected in parallel with both ends of resistor R58.

[0030] In this embodiment, output terminals No. 10 and No. 11 of amplifier IC12 are connected in series with resistors R54 and R52 respectively and then connected to the input terminal of collector IC14. Output terminal No. 6 of collector IC14 is connected in series with resistor R60 and then connected to port No. 1 of comparator IC16. Port No. 4 of comparator IC16 is connected to port No. 2 of main controller IC4.

[0031] In this embodiment, port 3 of the comparator IC16 is connected in series with a resistor R63 and then to the simulator IC19. The comparator IC16 uses an LMV321-N-Q1 series chip, and the simulator IC19 uses an LTC2644CMS-L12 series chip. Port 2 of the simulator IC19 inputs an external 0-100% square wave signal.

[0032] Specifically, the amplifier IC12 uses the AMC3330DWE series chip, and collects the output voltage of the secondary side of the transformer T2 through its input end. After isolation and amplification by the amplifier IC12, the proportional voltage signal is transmitted to the collector IC14. The collector IC14 uses the INA213CQDCKRQ1 series chip. The collector IC14 reduces the voltage ratio of the input proportional voltage signal and transmits it to the comparator IC16. At the same time, the simulator IC19 converts the external input 0-100% square wave signal into an analog signal and inputs it into the comparator IC16. The comparator IC16 transmits the input voltage difference to the controller IC4. The controller IC4 uses the UCC28082D series chip. The controller IC4 generates a 300kHZ pulse signal based on the input voltage difference to drive the switch tube Q4 and the switch tube Q8 to alternately turn on, thereby boosting the input DC12V to 1.5kV output through the transformer T2, and the output current is stable.

[0033] The above description is a detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit suggested by the present invention should fall within the scope of the patent covered by the present invention.

Claims

1. A screen grid high voltage power supply, characterized in that: It includes a main controller IC4 and a control circuit and a collection and conversion circuit connected to the main controller IC4. The control circuit is connected to the voltage conversion circuit. The voltage conversion circuit includes a transformer T2. The control circuit is connected to the primary side of the transformer T2. The collection and conversion circuit is connected to the secondary side of the transformer T2. The control circuit includes a switch tube Q4 and a switch tube Q8. The switch tube Q4 and the switch tube Q8 are gallium nitride switch tubes, which are connected between the main controller IC4 and the transformer T2.

2. A screen grid high voltage power supply according to claim 1, characterized in that: A resistor R10 and a resistor R19 are connected in series between the main controller IC4 and the switch tubes Q4 and Q8, respectively. Diodes DZ1 and DZ2 are connected in parallel at both ends of the resistors R10 and R19, respectively.

3. A screen grid high voltage power supply according to claim 2, characterized in that: The drain of the switch tube Q4 is connected to the primary end of the transformer T2, the source is connected in series with the resistor R34 and then to the ground. The drain of the switch tube Q8 is connected to the other primary end of the transformer T2, the source is connected in series with the resistor R34 and then to the ground.

4. A screen grid high voltage power supply according to claim 1, characterized in that: A resistor R124 and an inductor L6 are connected in series between the transformer T2 and the power input terminal. A capacitor C20 is connected in series between the resistor R124 and the inductor L6 and then connected to the ground terminal. The input terminal is also connected in parallel with capacitors C21, C16, C22, C17 and C171. A full-bridge rectifier circuit is connected in parallel at both ends of the secondary side of the transformer T2.

5. A screen grid high voltage power supply according to claim 4, characterized in that: The full-bridge rectifier circuit includes a diode D3 and a diode D7, a diode D4 and a diode D8 connected in series, followed by an inductor L1, a diode D1 and a diode D2 connected in series. A diode D12 and a diode D14, a diode D13 and a diode D15 are connected in series between the two ends of the secondary side of the transformer T2 and the ground terminal, respectively.

6. A screen grid high voltage power supply according to claim 4, characterized in that: One end of the secondary side of the transformer T2 is connected in series with the inductor L1, the diode D1 and the diode D2 and then connected to the output end. One end of the secondary side of the transformer T2 is connected in series with the resistor R16 and then connected to the ground end. Capacitors C10, C13 and capacitor C14 are also connected in parallel between the two ends of the secondary side of the transformer T2.

7. The screen grid high voltage power supply according to claim 5, characterized in that: The acquisition and conversion circuit includes amplifier IC7 and amplifier IC12. Ports 6 and 7 of the amplifier IC7 are respectively connected in series with resistors R25 and R26 and then connected to both ends of the resistor R16. Ports 10 and 11 of the amplifier IC7 are respectively connected in series with resistors R40 and R41 and then connected to IC9.

8. The screen grid high voltage power supply according to claim 7, characterized in that: Port 6 of the amplifier IC12 is connected in series with resistors R53, R48, R46, R42, R37, R36, and R31, and then connected to one end of the secondary side of the transformer T2. The series circuit composed of resistors R48, R46, R42, R37, R36, and R31 is also connected in parallel with a series circuit of resistor R32 and capacitor C44. The series circuit of resistor R53 and resistor R48 is also connected to the ground terminal through a series resistor R58. Diodes DR4 and D7 are also connected in parallel at both ends of the resistor R58.

9. The screen grid high voltage power supply according to claim 7, characterized in that: Output terminal No. 6 of the amplifier IC12 is connected in series with a resistor R60 and then connected to port No. 1 of the comparator IC16 , and port No. 4 of the comparator IC16 is connected to port No. 2 of the main controller IC4 .

10. The screen grid high voltage power supply according to claim 9, characterized in that: The No. 3 port of the comparator IC16 is connected in series with a resistor R63 and then connected to the simulator IC19. The No. 2 port of the simulator IC19 inputs an external 0-100% square wave signal.

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