Conversion circuit for converting direct-current low voltage into pulse high voltage

Abstract

The utility model belongs to the technical field of voltage conversion, and particularly discloses a conversion circuit for converting direct-current low voltage into pulse high voltage, which comprises a power switch driving circuit, a power switch circuit, a pulse boosting transformer, a voltage multiplier circuit and a signal feedback circuit, the output end of the power switch driving circuit is connected with the driving end of the power switch circuit, the input end of the power switch circuit is connected with an input power supply, and the output end of the power switch circuit is connected with the input end of the pulse boosting transformer; the output end of the pulse boosting transformer is connected with the input end of the voltage multiplier; the output end of the voltage multiplier is connected with the input ends of the rear-end equipment and the signal feedback circuit; and the output end of the signal feedback circuit is connected with the input end of the power switch driving circuit. The utility model can reduce the requirement of the input power supply on the input current.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage conversion, in particular to a conversion circuit for converting a direct current low voltage into a pulse high voltage. Background Art

[0002] The module that converts low-voltage DC into pulsed high voltage is a boost module. Its main function is to convert low-voltage DC voltage energy input into unidirectional positive pulsed high-voltage output under certain preconditions, and serve as a module power supply to provide high-voltage power to back-end equipment.

[0003] Pulsed power technology, developed in the 1930s based on the needs of nuclear fusion research, has since gained widespread attention in defense, industry, and other fields. In the late 1970s, its applications expanded to include nuclear physics, acceleration, electromagnetic metal processing, plasma research, microwave and radio frequency technology, and other fields.

[0004] Pulse power technology has made significant progress. Pulse power systems are a core component of this field. As a key branch of this technology, pulsed high magnetic fields also place corresponding demands on their power supply. A pulse transformer is a special type of transformer that converts unipolar, nearly rectangular pulse voltages, rather than sinusoidal or AC voltages. Its primary uses include increasing or decreasing pulse voltages and changing pulse polarity. The primary function of a power module is voltage conversion, converting AC or DC power to the desired AC or DC voltage.

[0005] The current technical status of the module for converting DC low voltage into pulse high voltage is: at this stage, the module for converting DC low voltage into pulse high voltage has not yet formed a module state, and all are PCB board-level components.

[0006] The current technical disadvantage is that the DC low voltage at the input end of the module that converts DC low voltage into pulsed high voltage requires a high input current during energy conversion, and all of them are PCB board-level discrete components, which increases the product size and has low versatility. Utility Model Content

[0007] The utility model provides a conversion circuit for converting a DC low voltage into a pulse high voltage, the purpose of which is to reduce the requirement of an input power source on an input current.

[0008] The utility model is realized by the following technical solutions: a conversion circuit for converting a DC low voltage into a pulsed high voltage, comprising a power switch driving circuit, a power switch circuit, a pulse boost transformer, a voltage multiplier circuit and a signal feedback circuit;

[0009] The output end of the power switch driving circuit is connected to the driving end of the power switch circuit, the input end of the power switch circuit is connected to the input power supply, the output end of the power switch circuit is connected to the input end of the pulse boost transformer, and the output end of the pulse boost transformer is connected to the input end of the voltage multiplier;

[0010] The output end of the voltage multiplier tube is connected to the back-end device and the input end of the signal feedback circuit; the output end of the signal feedback circuit is connected to the input end of the power switch driving circuit.

[0011] Furthermore, the power switch driving circuit includes a chip U1, a capacitor C6, a capacitor C7, a first power supply, a resistor R2, and a resistor R4. The IN+ pin of the chip U1 is connected in series with the resistor R2 and connected to the first power supply. The IN- pin of the chip U1 is connected to the frequency signal terminal and is connected to the first power supply through the resistor R4 in series.

[0012] The GND pin of the chip U1 is connected to the high-voltage ground, the VDD pin of the chip U1 is connected to the first power supply, one end of the capacitor C6 and the capacitor C7 are connected to the VDD pin of the chip U1, and the other end of the capacitor C6 and the capacitor C7 are connected to the high-voltage ground; the OUT pin of the chip U1 is connected to the driving end of the power switching circuit, and the IN+ pin of the chip U1 is connected to the output end of the signal feedback circuit.

[0013] Furthermore, the model of the chip U1 is SL27517.

[0014] Furthermore, the power switch circuit includes a chip Q1, a capacitor C2, a capacitor C3, a capacitor C4 and a resistor R3, and the S pin of the chip Q1, one end of the capacitor C2, the capacitor C3, the capacitor C4 and one end of the resistor R3 are all connected to the high voltage ground;

[0015] The other end of the resistor R3 is connected to the G pin of the chip Q1, and the other ends of the capacitors C2, C3, and C4 are all connected to the input power supply;

[0016] The D pin of the chip Q1 is connected to one end of the primary coil of the pulse boost transformer, and the other end of the primary coil of the pulse boost transformer is connected to the input power supply;

[0017] The secondary coil of the pulse boost transformer is connected to the voltage multiplier circuit.

[0018] Furthermore, the model of the chip Q1 is NCEP0114AS.

[0019] Furthermore, the voltage multiplier circuit includes a capacitor C1, a capacitor C5, a diode D1 and a diode D2, one end of the secondary coil of the pulse boost transformer is connected to the cathode of the diode D2 and the anode of the diode D1 through the capacitor C1 connected in series, and the other end of the secondary coil of the pulse boost transformer and the anode of the diode D2 are both grounded;

[0020] The cathode of the diode D1 is connected to the ground via the capacitor C5 in series. The cathode of the diode D1 is connected as an output end to the input end of the signal feedback circuit and the back-end device respectively.

[0021] Furthermore, the signal feedback circuit includes an optocoupler U2, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C8, a second power supply and a voltage reference chip U3;

[0022] The cathode of the voltage reference chip U3 is connected to the emitter anode of the optocoupler U2 through a series resistor R5, the emitter anode of the optocoupler U2 is connected to a second power supply, and the cathode of the voltage reference chip U3 is also connected to the emitter cathode of the optocoupler U2 through a series resistor R7; the E pole of the receiving end of the optocoupler U2 is connected to the high voltage ground, and the C pole of the receiving end of the optocoupler U2 is connected to the input end of the power switch drive circuit;

[0023] The anode of the voltage reference chip U3 is grounded; the resistor R6 is grounded via a parallel link consisting of a resistor R8 and a capacitor C8, and the reference end of the voltage reference chip U3 is connected to a common circuit between the resistor R6 and the resistor R8.

[0024] Furthermore, the second power supply is 12V.

[0025] Furthermore, the model of the optical coupler U2 is OR-3H7B.

[0026] Furthermore, a resistor R1 is connected in series between the output end of the power switch driving circuit and the driving end of the power switch circuit.

[0027] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0028] In the present invention, the input power supply can be a low-voltage power supply of DC low voltage, and the input power supply is connected to a pulse step-up transformer, so that the low-voltage power supply can be effectively converted into pulse high voltage through the pulse step-up transformer. In this way, the input DC low-voltage current can be transmitted to the pulse step-up transformer through the power switch for conversion. The pulse step-up transformer can convert the input DC low-voltage power supply into high-voltage pulse energy. The pulse energy is rectified and multiplied by the voltage multiplier circuit and then outputs a high voltage of 1250V. When the pulse high voltage reaches 1250V, the branch signal is fed back to the power switch drive device to control its voltage at a preset value to realize the system design.

[0029] In the utility model, a low-voltage power supply can be input through the power switch driving circuit and the power switch circuit, and the input current is relatively low, which can effectively reduce the input power supply's requirement on the input current. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0031] Figure 1 This is a circuit diagram of an embodiment of a conversion circuit for converting a DC low voltage into a pulsed high voltage according to the present utility model;

[0032] Figure 2 This is a principle flow chart of an embodiment of a conversion circuit for converting a DC low voltage into a pulsed high voltage according to the present utility model;

[0033] Figure 3 The present invention is a circuit diagram of a voltage reference chip in a conversion circuit embodiment for converting a DC low voltage into a pulsed high voltage. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0035] like Figure 1-Figure 2 As shown, this embodiment provides a conversion circuit for converting a DC low voltage into a pulsed high voltage, including a power switch driving circuit, a power switch circuit, a pulse boost transformer, a voltage multiplier circuit, and a signal feedback circuit;

[0036] The output end of the power switch driving circuit is connected to the driving end of the power switch circuit, the input end of the power switch circuit is connected to the input power supply VCC, the output end of the power switch circuit is connected to the input end of the pulse boost transformer, and the output end of the pulse boost transformer is connected to the input end of the voltage multiplier;

[0037] The output end of the voltage multiplier tube is connected to the back-end device and the input end of the signal feedback circuit; the output end of the signal feedback circuit is connected to the input end of the power switch driving circuit.

[0038] Specifically: In this embodiment, the power switch driving circuit includes a chip U1, a capacitor C6, a capacitor C7, a first power supply, a resistor R2, and a resistor R4. The model of the chip U1 in this embodiment is SL27517. The IN+ pin of the chip U1 is connected in series with the resistor R2 and is connected to the first power supply. The IN- pin of the chip U1 is connected to the frequency signal terminal SWD and is also connected to the first power supply through the resistor R4. In this embodiment, the voltage of the first power supply is 5V.

[0039] The GND pin of chip U1 is connected to the high-voltage ground, the VDD pin of chip U1 is connected to the first power supply, one end of capacitor C6 and capacitor C7 is connected to the VDD pin of chip U1, and the other end of capacitor C6 and capacitor C7 is connected to the high-voltage ground; the OUT pin of chip U1 is connected to the driving end of the power switching circuit, and the IN+ pin of chip U1 is connected to the output end of the signal feedback circuit.

[0040] The power switch circuit includes a chip Q1, capacitors C2, C3, C4, and a resistor R3. In this embodiment, the model of the chip Q1 is NCEP0114AS. The three S pins of the chip Q1, one end of the capacitors C2, C3, and C4, and one end of the resistor R3 are all connected to the high-voltage ground.

[0041] The other end of resistor R3 is connected to the G pin of chip Q1, and the other ends of capacitors C2, C3, and C4 are all connected to the input power supply VCC. In this embodiment, the input power supply VCC is a low-voltage power supply of 28V±1V. In this embodiment, a resistor R1 is connected in series between the output end of the power switch drive circuit and the drive end of the power switch circuit. Specifically, the OUT pin of chip U1 in the power switch drive circuit is connected to the G pin of the power switch circuit through the series resistor R1.

[0042] The four D pins of chip Q1 are connected to one end of the primary coil of the pulse boost transformer T1, and the other end of the primary coil of the pulse boost transformer T1 is connected to the input power supply; the secondary coil of the pulse boost transformer is connected to the voltage multiplier circuit, and the model of the pulse boost transformer T1 is ER9.5.

[0043] In this embodiment, the voltage multiplier circuit includes capacitor C1, capacitor C5, diode D1, and diode D2. One end of the secondary coil of the pulse boost transformer is connected to the cathode of diode D2 and the anode of diode D1 via the series capacitor C1. The other end of the secondary coil of the pulse boost transformer and the anode of diode D2 are both grounded.

[0044] The cathode of diode D1 is grounded via series capacitor C5. The cathode of diode D1 serves as an output terminal, connected to the input of the signal feedback circuit and the back-end device, respectively. The back-end device in this embodiment can be equipment in applications requiring high safety, high control, and high reliability, such as aerospace, detonators, missile ignition, engine ignition, and high-voltage environments.

[0045] The signal feedback circuit includes an optocoupler U2, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C8, a second power supply, and a voltage reference chip U3. In this embodiment, the model of the optocoupler U2 is OR-3H7B.

[0046] Pin 1 of the optocoupler U2 represents the emitter anode, pin 2 represents the emitter cathode, pin 3 represents the E pole of the receiving end, and pin 4 represents the C pole of the receiving end. In this embodiment, the voltage reference chip U3 is MX431. Figure 3 As shown, the voltage reference chip U3 includes a cathode, an anode and a reference terminal, and its output voltage is adjustable. Figure 1 As shown, the cathode of the voltage reference chip U3 is connected to the emitter anode of the optocoupler U2 through a series resistor R5, and the emitter anode of the optocoupler U2 is connected to the second power supply. In this embodiment, the second power supply is 12V;

[0047] The cathode of the voltage reference chip U3 is also connected to the emitter cathode of the optocoupler U2 through a series resistor R7; the E-pole of the receiving end of the optocoupler U2 is connected to the high-voltage ground, and the C-pole of the receiving end of the optocoupler U2 is connected to the input end of the power switch drive circuit. Specifically: in this embodiment, the C-pole of the receiving end of the optocoupler U2 is connected to the IN+ pin of the power switch drive circuit;

[0048] The anode of the voltage reference chip U3 is grounded, and the voltage reference chip resistor R6 is grounded through a parallel link composed of a resistor R8 and a capacitor C8, that is, the resistor R8 and the capacitor C8 are set in parallel, and the resistor R6 is connected to the parallel circuit of the resistor R8 and the capacitor C8 and then grounded. The reference end of the voltage reference chip U3 is connected to the common circuit between the resistor R6 and the resistor R8.

[0049] In this embodiment, a conversion circuit for converting low-voltage DC to high-voltage pulses is designed for a 1250V low-voltage system, reducing withstand voltage and insulation requirements while increasing device selectivity. This module is designed for a 1250V low-voltage system, reducing withstand voltage and insulation requirements while increasing device selectivity.

[0050] In this embodiment, the power switch drive circuit, the power switch circuit, the pulse boost transformer, the voltage multiplier circuit and the signal feedback circuit are integrated on a PCB board, which can reduce the product volume and has high versatility.

[0051] Combine Figure 2 As shown, in the present invention, after a low-voltage power supply is input to the input end of the power switch circuit and a frequency signal is input to the frequency signal end of the power switch driver, in this embodiment, the input power supply is a DC low-voltage power supply. The power switch driver amplifies the input frequency signal and transmits it to the power switch, thereby improving the operating efficiency of the power switch to enable the pulse boost transformer to convert the DC low voltage into a pulse high voltage. The pulse high voltage is then boosted to 1250V by the voltage multiplier circuit. When the pulse high voltage reaches 1250V, the branched signal is fed back to the power switch driver circuit through the signal feedback circuit, controlling its voltage at a preset value, thereby realizing the system design. After rectification and boosting by the voltage multiplier circuit, the pulse high voltage is output for use by the back-end equipment.

[0052] In this embodiment, the input power supply VCC is 28V ± 1V, and the control conversion signal (i.e., level signal) input from the frequency signal terminal is 5V @ 100kHz ± 10kHz, meaning the level signal has a voltage of 5V and a frequency of 100kHz ± 10kHz. The output high-voltage pulse voltage reaches a maximum of 1300V, and the stable output voltage is 1250V ± 50V. When connected to an external capacitor ≤ 1uf, the charging time is ≤ 200ms, and the charging current is no more than 1A.

[0053] It should be noted that the above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0054] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0055] In the description of this document, the terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only used to illustrate the relative position relationship between the various components or components, and do not particularly limit the specific installation orientation of the various components or components.

[0056] In the descriptions of this document, some terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0057] In this document, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0058] The structures, proportions, sizes, etc. drawn in the drawings in this application are only used to match the contents disclosed in this technical briefing document for those skilled in the art to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0059] The terms used in this document are those commonly used in the art currently in consideration of the functions of the present disclosure, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the document should not be understood as simple names, but rather as a general description based on the meaning of the terms and the present disclosure.

[0060] Flowcharts or text are used in this document to illustrate the operational steps performed according to the embodiments of the present application. It should be understood that the operational steps in the embodiments of the present application are not necessarily performed in the exact order in which they are described. Instead, the various steps may be processed in reverse order or simultaneously, as needed. Furthermore, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0061] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A conversion circuit for converting DC low voltage into pulse high voltage, characterized in that: It includes a power switch driving circuit, a power switch circuit, a pulse boost transformer, a voltage multiplier circuit and a signal feedback circuit; The output end of the power switch driving circuit is connected to the driving end of the power switch circuit, the input end of the power switch circuit is connected to the input power supply, the output end of the power switch circuit is connected to the input end of the pulse boost transformer, and the output end of the pulse boost transformer is connected to the input end of the voltage multiplier; The output end of the voltage multiplier tube is connected to the back-end device and the input end of the signal feedback circuit; the output end of the signal feedback circuit is connected to the input end of the power switch driving circuit.

2. The conversion circuit for converting a DC low voltage into a pulsed high voltage according to claim 1, characterized in that: The power switch driving circuit includes a chip U1, a capacitor C6, a capacitor C7, a first power supply, a resistor R2, and a resistor R4. The IN+ pin of the chip U1 is connected in series with the resistor R2 and connected to the first power supply. The IN- pin of the chip U1 is connected to the frequency signal terminal and is connected to the first power supply through the resistor R4 in series. The GND pin of the chip U1 is connected to the high-voltage ground, the VDD pin of the chip U1 is connected to the first power supply, one end of the capacitor C6 and the capacitor C7 are connected to the VDD pin of the chip U1, and the other end of the capacitor C6 and the capacitor C7 are connected to the high-voltage ground; the OUT pin of the chip U1 is connected to the driving end of the power switching circuit, and the IN+ pin of the chip U1 is connected to the output end of the signal feedback circuit.

3. The conversion circuit for converting a DC low voltage into a pulsed high voltage according to claim 2, characterized in that: The model of the chip U1 is SL27517.

4. The conversion circuit for converting a DC low voltage into a pulsed high voltage according to claim 1, characterized in that: The power switch circuit includes a chip Q1, a capacitor C2, a capacitor C3, a capacitor C4 and a resistor R3, wherein the S pin of the chip Q1, one end of the capacitor C2, the capacitor C3, the capacitor C4 and one end of the resistor R3 are all connected to the high voltage ground; The other end of the resistor R3 is connected to the G pin of the chip Q1, and the other ends of the capacitors C2, C3, and C4 are all connected to the input power supply; The D pin of the chip Q1 is connected to one end of the primary coil of the pulse boost transformer, and the other end of the primary coil of the pulse boost transformer is connected to the input power supply; The secondary coil of the pulse boost transformer is connected to the voltage multiplier circuit.

5. The conversion circuit for converting a DC low voltage into a pulsed high voltage according to claim 4, characterized in that: The model of the chip Q1 is NCEP0114AS.

6. The conversion circuit for converting a DC low voltage into a pulsed high voltage according to claim 1, characterized in that: The voltage multiplier circuit includes a capacitor C1, a capacitor C5, a diode D1 and a diode D2, one end of the secondary coil of the pulse boost transformer is connected to the cathode of the diode D2 and the anode of the diode D1 through the capacitor C1 connected in series, and the other end of the secondary coil of the pulse boost transformer and the anode of the diode D2 are both grounded; The cathode of the diode D1 is connected to the ground via the capacitor C5 in series. The cathode of the diode D1 is connected as an output end to the input end of the signal feedback circuit and the back-end device respectively.

7. The conversion circuit for converting a DC low voltage into a pulsed high voltage according to claim 1, characterized in that: The signal feedback circuit includes an optocoupler U2, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C8, a second power supply and a voltage reference chip U3; The cathode of the voltage reference chip U3 is connected to the emitter anode of the optocoupler U2 through a series resistor R5, the emitter anode of the optocoupler U2 is connected to a second power supply, and the cathode of the voltage reference chip U3 is also connected to the emitter cathode of the optocoupler U2 through a series resistor R7; the E pole of the receiving end of the optocoupler U2 is connected to the high voltage ground, and the C pole of the receiving end of the optocoupler U2 is connected to the input end of the power switch drive circuit; The anode of the voltage reference chip U3 is grounded; the resistor R6 is grounded via a parallel link consisting of a resistor R8 and a capacitor C8, and the reference end of the voltage reference chip U3 is connected to a common circuit between the resistor R6 and the resistor R8.

8. The conversion circuit for converting a DC low voltage into a pulsed high voltage according to claim 7, characterized in that: The second power supply is 12V.

9. The conversion circuit for converting a DC low voltage into a pulsed high voltage according to claim 7, characterized in that: The model of the optical coupler U2 is OR-3H7B.

10. A conversion circuit for converting a DC low voltage into a pulsed high voltage according to any one of claims 1 to 9, characterized in that: A resistor R1 is connected in series between the output end of the power switch driving circuit and the driving end of the power switch circuit.

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