A flexible voltage-regulated DC high-voltage power supply

Abstract

The utility model discloses a kind of DC high voltage power supplies of flexible voltage regulation, including crystal high voltage plate, potentiometer and display screen, crystal high voltage plate includes power management power supply conversion circuit, pulse width modulation circuit, boost circuit, rectifier filter circuit and feedback display circuit, power management power supply conversion circuit is powered by the voltage reduction module for pulse width modulation circuit, boost circuit and feedback display circuit with external input power supply, pulse width modulation circuit connects potentiometer, and input pulse width modulation chip after adjusting voltage is amplified by first operational amplifier, pulse width modulation chip exports PWM signal, PWM signal is transported to the MOS pipe gate of boost circuit, the drain of MOS pipe is connected the primary of transformer, the secondary of transformer is accessed rectifier filter circuit, and DC high voltage is exported to outside;The secondary of transformer is accessed feedback display circuit, and it is handled as sampling voltage by second operational amplifier, and sampling voltage is transported to pulse width modulation chip in one way, and another way is connected display screen by third operational amplifier.

Description

Technical Field

[0001] This utility model belongs to the field of DC high voltage power supply technology, specifically relating to a DC high voltage power supply with flexible voltage adjustment. Background Technology

[0002] Existing DC high-voltage power supplies are bulky and slow to respond, making them suitable only for laboratory scenarios with low precision requirements. However, they suffer from problems such as being inconvenient to carry, having difficulty adjusting the output voltage, and being unable to provide accurate DC high voltage when faced with more complex outdoor scenarios or scenarios with high precision requirements.

[0003] In various research, experimental, and equipment debugging scenarios, a stable DC high voltage is often required. This is typically achieved by using a DC high-voltage power supply (hereinafter referred to as "high-voltage source") to convert lower AC power (such as 220V AC mains power) into high-voltage DC. Existing technologies utilize transformers for voltage boosting, adjusting the transformer's turns ratio mechanically to regulate the input AC voltage, and then rectifying and filtering to obtain different DC high voltages.

[0004] Mechanically adjustable high-voltage sources have disadvantages such as large size and slow response, making them only suitable for laboratories or scenarios with low requirements for competitors. To adapt to more occasions involved in research and development and debugging work, and to meet the requirements for voltage accuracy, this utility model provides a high-voltage source that is small in size, light in weight, easy to carry, and can be flexibly adjusted within the range of 1kV-5kV (adjustment accuracy of 0.1kV). Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a flexibly adjustable DC high-voltage power supply with 220V AC mains input and 1kV-5kV DC voltage output, which can be applied to equipment debugging scenarios that require DC high voltage input.

[0006] This utility model achieves this objective through the following technical solution: A flexibly adjustable DC high voltage power supply includes a crystal high voltage board, a potentiometer, and a display screen. The crystal high voltage board includes a power management power conversion circuit, a pulse width modulation circuit, a boost circuit, a rectifier and filter circuit, and a feedback display circuit. The power management power conversion circuit supplies power to the pulse width modulation circuit, boost circuit, and feedback display circuit via the buck module from the external input power. The pulse width modulation circuit is connected to a potentiometer. The adjusted voltage is amplified by the first operational amplifier and then input to the pulse width modulation chip. The pulse width modulation chip outputs a PWM signal. The boost circuit includes a MOSFET and a transformer. The PWM signal is sent to the gate of the MOSFET in the boost circuit. The drain of the MOSFET is connected to the primary winding of the transformer. The secondary winding of the transformer is connected to the rectifier filter circuit and the feedback display circuit, respectively. The rectifier and filter circuit outputs a high-voltage DC voltage. The feedback display circuit processes the voltage output from the boost circuit into a sampling voltage via the second operational amplifier. The sampling voltage is then sent to the pulse width modulation chip and the third operational amplifier, and the output of the third operational amplifier is connected to the display screen.

[0007] Furthermore, the external power supply is connected to the IN+ and IN- terminals of voltage conversion chip N1 via resistors R21 and R22 respectively. The OUT+ terminal of voltage conversion chip N1 is connected to one end of capacitor C5, the positive terminal of electrolytic capacitor C6, and one end of resistor R2, and outputs VCC power. The OUT- terminal of voltage conversion chip N1 is connected to the other end of capacitor C5, the negative terminal of electrolytic capacitor C6, one end of capacitor C8, and the negative terminal of electrolytic capacitor C7, and grounded. The other end of resistor R2 is connected to the other end of capacitor C8 and the positive terminal of electrolytic capacitor C7, and outputs power. The VCC power supply is connected to pin 1 of voltage conversion chip N2 via resistor R4. Pin 3 of voltage conversion chip N2 is connected to the positive terminal of electrolytic capacitor C13 and one end of capacitor C14, and outputs 5V power. Pin 2 of voltage conversion chip N2 is connected to the negative terminal of electrolytic capacitor C13 and the other end of capacitor C14, and grounded. The model of voltage conversion chip N1 is YAS2.5-15-TWS, and the model of voltage conversion chip N2 is L7805.

[0008] Furthermore, the pulse width modulation circuit structure is as follows: the two fixed terminals of the potentiometer are connected to the 5V power supply and GND respectively via pins 3 and 1 of connector XS2; pin 2 of connector XS2 is connected to one end of resistors R11 and R15 respectively; the other end of resistor R11 is connected to one end of capacitor C18 and the "+" input terminal of the first operational amplifier N5A; the other end of capacitor C18 is grounded; the positive power supply terminal of the first operational amplifier N5A is connected to one end of resistor R9 and one end of capacitor C17 respectively; the other end of resistor R9 is connected to the VCC power supply; the other end of capacitor C17 is grounded; the negative power supply terminal of the first operational amplifier N5A is grounded; the output terminal of the first operational amplifier N5A is connected to one end of resistors R12 and R16 and the "-" input terminal of the first operational amplifier N5A respectively; the other end of resistor R16 is grounded; the other end of resistor R12 is connected to pin 2 of the pulse width modulation chip N3; pin 11 of the pulse width modulation chip N3 outputs a high-frequency PWM signal; the pulse width modulation chip N3 is model SG3524.

[0009] Furthermore, the boost circuit structure is as follows: the PWM signal output terminal of the pulse width modulation chip is connected to the gate of MOSFET N4 via resistor R3. The drain of MOSFET N4 is connected to pin 3 of transformer T1. Pin 2 of transformer T1 is connected to resistor R1, one end of capacitor C2, and the positive terminal of electrolytic capacitor C1, respectively. The other end of resistor R1 is connected to VCC power supply. The negative terminal of electrolytic capacitor C1 is connected to the other end of capacitor C2 and grounded. Pin 1 of transformer T1 is left floating. Pins 4 and 6 of transformer T1 are connected to the rectifier and filter circuit as output terminals. The source of MOSFET N4 is connected to pin 4 of transformer T1 and one end of resistor R8 and grounded, respectively. The other end of resistor R8 is connected to resistor R3 and the gate of MOSFET N4, respectively. The transformer T1 model is GYB-5T2-14.615.

[0010] Furthermore, the MOSFET N4 is replaced with an IGBT, the gate of the IGBT is connected to a resistor R3, the emitter is grounded, and the collector is connected to pin 3 of the transformer T1.

[0011] Furthermore, the MOSFET N4 is replaced with a transistor, the base of which is connected to resistor R3, the emitter is grounded, and the collector is connected to pin 3 of transformer T1.

[0012] Furthermore, the rectifier filter circuit structure is as follows: one output terminal of the transformer secondary is connected to one end of capacitor C3 and the positive terminal of diode D4 respectively; the other output terminal of the transformer secondary is connected to one end of capacitor C10; the negative terminal of diode D4 is connected to the other end of capacitor C10, the positive terminal of diode D1, and one end of capacitor C11 respectively; the negative terminal of diode D1 is connected to the other end of capacitor C3, the positive terminal of diode D2, and one end of capacitor C4 respectively; the negative terminal of diode D2 is connected to the other end of capacitor C11 and the positive terminal of diode D3 respectively; and the negative terminal of diode D3 is connected to one end of capacitor C4 and outputs a DC high voltage.

[0013] Furthermore, the feedback display circuit structure is as follows: the DC high voltage output from the rectifier filter circuit is connected to the "+" input terminal of the second operational amplifier N6 and one end of the bidirectional breakdown diode D5 via the voltage divider resistor R7. The other end of the bidirectional breakdown diode D5 is connected to one end of capacitor C22 and grounded. The other end of capacitor C22 is connected to one end of resistor R14 and the positive power supply terminal of the second operational amplifier N6. The other end of resistor R14 is connected to the VCC power supply. The negative power supply terminal of the second operational amplifier N6 is grounded. The output terminal of the second operational amplifier N6 is connected to resistors R17 and R1... One end of resistor R8 is connected to the "-" input terminal of the second operational amplifier N6. The other end of resistor R17 is connected to the pulse width modulation chip N3 in the pulse width modulation circuit. The other end of resistor R18 is connected to the "+" input terminal of the third operational amplifier N5B. The "-" input terminal of the third operational amplifier N5B is connected to one end of resistor R20. The output terminal of the third operational amplifier N5B is connected to the other end of resistor R20 and one end of resistor R19. The other end of resistor R19 is connected to one end of capacitor C21 and connected to the digital tube display screen through connector XS4. The other end of capacitor C21 is grounded.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: The DC high-voltage power supply with flexible voltage adjustment provided by this utility model achieves high-efficiency conversion through "high-frequency switching + transformer step-up", which has a higher conversion efficiency than linear power supply. The voltage is controlled by adjusting the PWM duty cycle to achieve flexible voltage adjustment. In addition, the DC high-voltage power supply of this utility model is smaller and lighter. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the overall circuit diagram of the crystal high voltage board of this utility model; Figure 3 This is a power management and power conversion circuit diagram for this utility model. Figure 4 This is a circuit diagram of the pulse width modulation of this utility model; Figure 5 This is the boost circuit diagram of this utility model; Figure 6 This is a circuit diagram of the rectifier and filter of this utility model; Figure 7 This is the circuit diagram for the feedback display of this utility model. Detailed Implementation

[0016] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] The basic components of this tooling are as follows: Figure 1 As shown: It includes a crystal high-voltage board, a display screen, and potentiometers. The crystal high-voltage board comprises five parts: a power management conversion circuit, a pulse width modulation circuit, a boost circuit, a rectifier and filter circuit, and a feedback display circuit. The overall circuit structure of the crystal high-voltage board is as follows: Figure 2 As shown.

[0018] Power management power conversion circuit such as Figure 3 As shown, the power management section needs to convert the 220V AC mains input to a voltage suitable for the various devices on the crystal high-voltage board, such as the 15V VCC voltage applicable to this invention. A voltage conversion chip N2 is used to convert VCC to 5V to meet the input requirements of other devices. The specific structure is as follows: An external power supply is connected to the IN+ and IN- terminals of voltage converter chip N1 via resistors R21 and R22, respectively. The OUT+ terminal of voltage converter chip N1 is connected to one end of capacitor C5, the positive terminal of electrolytic capacitor C6, and one end of resistor R2, and outputs VCC power. The OUT- terminal of voltage converter chip N1 is connected to the other end of capacitor C5, the negative terminal of electrolytic capacitor C6, one end of capacitor C8, and the negative terminal of electrolytic capacitor C7, and grounded. The other end of resistor R2 is connected to the other end of capacitor C8 and the positive terminal of electrolytic capacitor C7, and outputs power to pulse width modulation chip N3. The VCC power supply is connected to pin 1 of voltage converter chip N2 via resistor R4. Pin 3 of voltage converter chip N2 is connected to the positive terminal of electrolytic capacitor C13 and one end of capacitor C14, and outputs 5V power. Pin 2 of voltage converter chip N2 is connected to the negative terminal of electrolytic capacitor C13 and the other end of capacitor C14, and grounded. The model of voltage converter chip N1 is YAS2.5-15-TWS, and the model of voltage converter chip N2 is L7805.

[0019] Pulse width modulation circuit, such as Figure 4As shown, the core of the pulse width modulation (PWM) circuit is the PWM controller, specifically the PWM chip N3, model SG3524. This part of the circuit is connected to a potentiometer via connector XS2. One fixed terminal of the potentiometer is connected to the 5V voltage from the power management conversion section (pin 3 of XS2), and the other is grounded (pin 1 of XS2). The adjustable terminal of the potentiometer is connected to pin 2 of XS2. When the potentiometer is adjusted, the voltage between pin 2 and pin 1 of XS2, which is also the input voltage of the first operational amplifier N5A, changes accordingly. This voltage is amplified by N5A and then input to the PWM chip N3 through pin 2. The PWM chip N3 receives the VCC power supply voltage from the power management conversion section through pin 15 and outputs a high-frequency PWM signal (square wave) through pin 11. According to the characteristics of the PWM chip, the duty cycle of this square wave signal is controlled by the input voltage of the PWM chip N3. This is the pulse width modulation process. The specific structure of the PWM circuit is as follows: The two fixed terminals of the potentiometer are connected to a 5V power supply and GND via pins 3 and 1 of connector XS2, respectively. Pin 2 of connector XS2 is connected to one end of resistors R11 and R15. The other end of resistor R11 is connected to one end of capacitor C18 and pin 3 of the first operational amplifier N5A. The other end of capacitor C18 is grounded. Pin 8 of the first operational amplifier N5A is connected to one end of resistor R9 and one end of capacitor C17. The other end of resistor R9 is connected to the VCC power supply. The other end of capacitor C17 is grounded. Pin 4 of the first operational amplifier N5A is grounded. Pin 1 of the first operational amplifier N5A is connected to one end of resistors R12 and R16 and pin 2 of the first operational amplifier N5A. The other end of resistor R16 is grounded. The other end of resistor R12 is connected to pin 2 of pulse width modulation chip N3. Pin 11 of pulse width modulation chip N3 outputs a high-frequency PWM signal. The model of pulse width modulation chip N3 is SG3524.

[0020] Boost circuit, such as Figure 5 As shown, the boost circuit uses a transformer as its core. The upper end of resistor R3 is connected to a square wave signal with an adjustable duty cycle output from the pulse width modulation section (pin 11 of the pulse width modulation chip N3), and the lower end is connected to the gate of MOSFET N4. The square wave signal controls the on / off state of N4, converting the square wave signal into a pulse. The pulse is then boosted by transformer T1 to become a high voltage. The specific structure is as follows: The PWM signal output terminal of the pulse width modulation chip is connected to the gate of MOSFET N4 via resistor R3. The drain of MOSFET N4 is connected to pin 3 of transformer T1. Pin 2 of transformer T1 is connected to resistor R1, one end of capacitor C2, and the positive terminal of electrolytic capacitor C1, respectively. The other end of resistor R1 is connected to VCC power supply. The negative terminal of electrolytic capacitor C1 is connected to the other end of capacitor C2 and grounded. Pin 1 of transformer is left floating. Pins 4 and 6 of transformer are connected to the rectifier and filter circuit as output terminals. The source of MOSFET N4 is connected to pin 4 of transformer T1 and one end of resistor R8 and grounded, respectively. The other end of resistor R8 is connected to R3 and the gate of MOSFET N4, respectively. The transformer T1 is model GYB-5T2-14.615.

[0021] Rectifier and filter circuits such as Figure 6 As shown: The transformer output section, after diode rectification and capacitor filtering, forms a high-voltage DC circuit, which can be output externally via connectors. The circuit structure is as follows: Pin 6 of transformer T1 is connected to one end of capacitor C3 and the positive terminal of diode D4. Pin 4 of transformer T1 is connected to one end of capacitor C10. The negative terminal of diode D4 is connected to the other end of capacitor C10, the positive terminal of diode D1, and one end of capacitor C11. The negative terminal of diode D1 is connected to the other end of capacitor C3, the positive terminal of diode D2, and one end of capacitor C4. The negative terminal of diode D2 is connected to the other end of capacitor C11 and the positive terminal of diode D3. The negative terminal of diode D3 is connected to one end of capacitor C4 and outputs a high DC voltage.

[0022] Feedback display circuit such as Figure 7 As shown: The second operational amplifier N6 receives the DC high voltage output from the rectifier and filter circuit. This DC high voltage is processed by the second operational amplifier N6 and N5B into a sampling voltage. The sampling voltage output from the second operational amplifier N6 is input to pin 1 of the pulse width modulation (PWM) chip N3 via resistor R17, assisting the PWM chip N3 in dynamically adjusting the duty cycle of the PWM signal to maintain a stable output high voltage. The output of the third operational amplifier N5B is input to the digital tube display screen via resistor R19, displaying the accurate value of the currently output DC high voltage on the screen. The specific structure is as follows: The high DC output from the rectifier and filter circuit is connected to pin 3 of the second operational amplifier N6 and one end of the bidirectional breakdown diode D5 via voltage divider resistor R7. The other end of the bidirectional breakdown diode D5 is connected to one end of capacitor C22 and grounded. The other end of capacitor C22 is connected to one end of resistor R14 and pin 7 of the second operational amplifier N6. The other end of resistor R14 is connected to the VCC power supply. The negative power supply terminal of the second operational amplifier N6 is grounded. Pin 6 of the second operational amplifier N6 is connected to one end of resistors R17 and R18 and pin 2 of the second operational amplifier N6. The other end of resistor R17 is connected to pin 1 of the pulse width modulation chip N3. The other end of resistor R18 is connected to pin 5 of the third operational amplifier N5B. Pin 6 of the third operational amplifier N5B is connected to one end of resistor R20. Pin 7 of the third operational amplifier N5B is connected to the other end of resistor R20 and one end of resistor R19. The other end of resistor R19 is connected to one end of capacitor C21 and connected to the digital tube display screen through connector XS4. The other end of capacitor C21 is grounded.

[0023] The first operational amplifier N5A and the third operational amplifier N5B are two operational amplifiers on the same device, model SMG8302, while the second operational amplifier N6 is model CA3140. Because the pulse width modulation chip N3 and the digital tube display are suited to handle different optimal voltage levels, the high DC voltage, after being processed by the second operational amplifier N6, is input to the pulse width modulation chip N3 as feedback. This voltage is then processed again by the third operational amplifier N5B before being input to the digital tube display. The digital tube display converts the voltage signal into a numerical value and displays it accordingly. This is equivalent to equipping both the pulse width modulation chip and the digital tube display with an operational amplifier, thus improving the accuracy of the pulse width modulation chip N3 and the digital tube display in processing the feedback voltage.

[0024] The power management and power conversion section can use different models of power modules.

[0025] Different switching devices can be selected when the boost converter switches the pulse, such as various types of transistors, MOSFETs, and IGBTs. If the MOSFET N4 in this embodiment is replaced with an IGBT, the gate of the IGBT is connected to resistor R3, the emitter is grounded, and the collector is connected to pin 3 of transformer T1; when the MOSFET N4 is replaced with a transistor, the base of the transistor is connected to resistor R3, the emitter is grounded, and the collector is connected to pin 3 of transformer T1.

[0026] The present invention has been described in detail above through embodiments, but the content described is only an exemplary embodiment of the present invention and should not be considered as limiting the scope of implementation of the present invention. The protection scope of the present invention is defined by the claims. Any technical solutions designed by those skilled in the art using the technical solutions described in the present invention, or designed by those skilled in the art under the inspiration of the technical solutions of the present invention, within the substance and protection scope of the present invention, to achieve the above-mentioned technical effects, or equivalent changes and improvements made to the scope of the application, should still fall within the patent protection scope of the present invention. It should be noted that, for clarity, descriptions of some components and processes that are not directly and obviously related to the protection scope of the present invention but are known to those skilled in the art have been omitted in the description of the present invention.

Claims

1. A DC high-voltage power supply with flexible voltage adjustment, characterized in that, It includes a crystal high-voltage board, a potentiometer, and a display screen. The crystal high-voltage board includes a power management power conversion circuit, a pulse width modulation circuit, a boost circuit, a rectifier and filter circuit, and a feedback display circuit. The power management power conversion circuit supplies power to the pulse width modulation circuit, boost circuit, and feedback display circuit through the buck module from the external input power. The pulse width modulation circuit is connected to a potentiometer. The adjusted voltage is amplified by the first operational amplifier and then input to the pulse width modulation chip. The pulse width modulation chip outputs a PWM signal. The boost circuit includes a MOSFET and a transformer. The PWM signal is sent to the gate of the MOSFET in the boost circuit. The drain of the MOSFET is connected to the primary winding of the transformer. The secondary winding of the transformer is connected to the rectifier filter circuit and the feedback display circuit, respectively. The rectifier and filter circuit outputs a high-voltage DC voltage. The feedback display circuit processes the voltage output from the boost circuit into a sampling voltage via the second operational amplifier. The sampling voltage is then sent to the pulse width modulation chip and the third operational amplifier, and the output of the third operational amplifier is connected to the display screen.

2. The DC high-voltage power supply with flexible voltage adjustment according to claim 1, characterized in that, The power management power conversion circuit structure is as follows: external power is connected to the IN+ and IN- terminals of voltage conversion chip N1 via resistors R21 and R22 respectively. The OUT+ terminal of voltage conversion chip N1 is connected to one end of capacitor C5, the positive terminal of electrolytic capacitor C6, and one end of resistor R2, and outputs VCC power. The OUT- terminal of voltage conversion chip N1 is connected to the other end of capacitor C5, the negative terminal of electrolytic capacitor C6, one end of capacitor C8, and the negative terminal of electrolytic capacitor C7, and grounded. The other end of resistor R2 is connected to the other end of capacitor C8 and the positive terminal of electrolytic capacitor C7, and outputs power. The VCC power is connected to pin 1 of voltage conversion chip N2 via resistor R4. Pin 3 of voltage conversion chip N2 is connected to the positive terminal of electrolytic capacitor C13 and one end of capacitor C14, and outputs 5V power. Pin 2 of voltage conversion chip N2 is connected to the negative terminal of electrolytic capacitor C13 and the other end of capacitor C14, and grounded. The model of voltage conversion chip N1 is YAS2.5-15-TWS, and the model of voltage conversion chip N2 is L7805.

3. The DC high-voltage power supply with flexible voltage adjustment according to claim 1, characterized in that, The pulse width modulation circuit structure is as follows: the two fixed terminals of the potentiometer are connected to the 5V power supply and GND respectively via pins 3 and 1 of connector XS2. Pin 2 of connector XS2 is connected to one end of resistors R11 and R15 respectively. The other end of resistor R11 is connected to one end of capacitor C18 and the "+" input terminal of the first operational amplifier N5A. The other end of capacitor C18 is grounded. The positive power supply terminal of the first operational amplifier N5A is connected to one end of resistor R9 and one end of capacitor C17 respectively. The other end of resistor R9 is connected to the VCC power supply. The other end of capacitor C17 is grounded. The negative power supply terminal of the first operational amplifier N5A is grounded. The output terminal of the first operational amplifier N5A is connected to one end of resistors R12 and R16 and the "-" input terminal of the first operational amplifier N5A respectively. The other end of resistor R16 is grounded. The other end of resistor R12 is connected to pin 2 of the pulse width modulation chip N3. Pin 11 of the pulse width modulation chip N3 outputs a high-frequency PWM signal. The pulse width modulation chip N3 is model SG3524.

4. The DC high-voltage power supply with flexible voltage adjustment according to claim 1, characterized in that, The boost circuit structure is as follows: the PWM signal output terminal of the pulse width modulation chip is connected to the gate of MOSFET N4 via resistor R3. The drain of MOSFET N4 is connected to pin 3 of transformer T1. Pin 2 of transformer T1 is connected to resistor R1, one end of capacitor C2, and the positive terminal of electrolytic capacitor C1, respectively. The other end of resistor R1 is connected to VCC power supply. The negative terminal of electrolytic capacitor C1 is connected to the other end of capacitor C2 and grounded. Pin 1 of transformer T1 is left floating. Pins 4 and 6 of transformer T1 are connected to the rectifier and filter circuit as output terminals. The source of MOSFET N4 is connected to pin 4 of transformer T1 and one end of resistor R8 and grounded, respectively. The other end of resistor R8 is connected to resistor R3 and the gate of MOSFET N4, respectively. The transformer T1 model is GYB-5T2-14.

615.

5. A flexibly adjustable DC high-voltage power supply according to claim 4, characterized in that, The MOSFET N4 is replaced with an IGBT. The gate of the IGBT is connected to a resistor R3, the emitter is grounded, and the collector is connected to pin 3 of the transformer T1.

6. The DC high-voltage power supply with flexible voltage adjustment according to claim 4, characterized in that, The MOSFET N4 is replaced with a transistor, the base of which is connected to resistor R3, the emitter is grounded, and the collector is connected to pin 3 of transformer T1.

7. The DC high-voltage power supply with flexible voltage adjustment according to claim 1, characterized in that, The rectifier filter circuit structure is as follows: one output terminal of the transformer secondary is connected to one end of capacitor C3 and the positive terminal of diode D4 respectively; the other output terminal of the transformer secondary is connected to one end of capacitor C10; the negative terminal of diode D4 is connected to the other end of capacitor C10, the positive terminal of diode D1, and one end of capacitor C11 respectively; the negative terminal of diode D1 is connected to the other end of capacitor C3, the positive terminal of diode D2, and one end of capacitor C4 respectively; the negative terminal of diode D2 is connected to the other end of capacitor C11 and the positive terminal of diode D3 respectively; and the negative terminal of diode D3 is connected to one end of capacitor C4 and outputs a DC high voltage.

8. The DC high-voltage power supply with flexible voltage adjustment according to claim 1, characterized in that, The feedback display circuit structure is as follows: The DC high voltage output from the rectifier filter circuit is connected to the "+" input terminal of the second operational amplifier N6 and one end of the bidirectional breakdown diode D5 via the voltage divider resistor R7. The other end of the bidirectional breakdown diode D5 is connected to one end of capacitor C22 and grounded. The other end of capacitor C22 is connected to one end of resistor R14 and the positive power supply terminal of the second operational amplifier N6. The other end of resistor R14 is connected to the VCC power supply. The negative power supply terminal of the second operational amplifier N6 is grounded. The output terminal of the second operational amplifier N6 is connected to resistors R17 and R18 respectively. The second operational amplifier N6's "-" input terminal is connected to the first terminal. The other end of resistor R17 is connected to the pulse width modulation chip N3 in the pulse width modulation circuit. The other end of resistor R18 is connected to the "+" input terminal of the third operational amplifier N5B. The "-" input terminal of the third operational amplifier N5B is connected to one end of resistor R20. The output terminal of the third operational amplifier N5B is connected to the other end of resistor R20 and one end of resistor R19. The other end of resistor R19 is connected to one end of capacitor C21 and connected to the digital tube display screen through connector XS4. The other end of capacitor C21 is grounded.

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