Low-ripple high-voltage power supply and design method thereof

A high-voltage power supply, low-ripple technology, applied in the direction of high-efficiency power electronic conversion, electrical components, adjusting electrical variables, etc., can solve the problems of difficult control circuit design, complicated calculation and selection, and speed up the design and debugging process. , reduce the design difficulty, the effect of simple design

Pending Publication Date: 2020-04-17
ECU ELECTRONICS INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] like figure 1 As shown, the high-voltage power supply of the buck+full-bridge main circuit topology is a two-stage series connection of the front-stage buck and the rear-stage full-bridge inverter circuit, which has the disadvantages of slow dynamic response, many switching tubes, and complex drive and control circuits.
LCC resonant converter is the main circuit topology of high-voltage power supply that is widely studied now, but this kind

Method used

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  • Low-ripple high-voltage power supply and design method thereof
  • Low-ripple high-voltage power supply and design method thereof
  • Low-ripple high-voltage power supply and design method thereof

Examples

Experimental program
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Example Embodiment

[0040] Example 1, please refer to figure 2 , A low-ripple high-voltage power supply and its design method, including a loop composed of a main circuit, a driving circuit, a control circuit, and a sampling circuit connected in sequence. The main circuit includes a single-phase rectifier bridge circuit, and the input of a single-phase rectifier bridge circuit , The output ends are respectively connected to the mains power supply and the half-bridge inverter circuit. The output end of the half-bridge inverter circuit is connected to the absorption circuit. One end of the absorption circuit is connected to the primary side of the step-up transformer, and the other end is connected to the resonant inductor. The primary side of the step-up transformer is connected in series; the secondary side of the step-up transformer is connected with the input end of the voltage doubler rectifier circuit, and the output end of the voltage doubler rectifier circuit is connected with the sampling ci...

Example Embodiment

[0052] Embodiment 2, a design method of a low-ripple high-voltage power supply, including the steps:

[0053] S1: First derive the equivalent circuit of the voltage doubler circuit. The voltage doubler rectifier uses a pumping method to obtain a higher output voltage, and the voltage stress of the rectifier device is relatively small. Under the premise of a certain output voltage, the more voltage doubler stages, the smaller the transformer ratio, which reduces the design difficulty of the transformer to a certain extent. The present invention uses such Figure 5 The C-W half-wave voltage doubler rectification shown.

[0054] The n-level voltage doubling can be understood as the series connection of n double voltage circuits. Figure 5 In, except C s1 The voltage at both ends is outside the peak output voltage of the secondary side of the transformer, other C s2 ~C s2n The voltage at both ends is twice the peak output voltage of the secondary side of the transformer. Set the cha...

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Abstract

The invention discloses a low-ripple high-voltage power supply and a design method thereof in the technical field of low-ripple high-voltage power supplies. The low-ripple high-voltage power supply comprises a loop mainly formed by sequentially connecting a main circuit, a driving circuit, a control circuit and a sampling circuit. The main circuit comprises a single-phase rectifier bridge circuit,the input end and the output end of the single-phase rectifier bridge circuit are connected with a mains supply and a half-bridge inverter circuit respectively, the output end of the half-bridge inverter circuit is connected with an absorption circuit, one end of the absorption circuit is connected with the primary side of a boosting transformer, and the other end of the absorption circuit is connected with a resonant inductor which is serially connected with the primary side of the boosting transformer. The secondary side of the boosting transformer is connected with the input end of a voltage doubling rectifying circuit, and the output end of the voltage doubling rectifying circuit is connected with the sampling circuit. The number of high-voltage power supply switching devices is small, and the design of a control and drive circuit is simple; in addition, a theoretical basis is provided for ripple design in technical indexes, model selection of main circuit components is facilitated, the design and debugging process is accelerated to a certain extent, and the design difficulty is reduced.

Description

technical field [0001] The invention relates to the field of low-ripple high-voltage power supplies, in particular to a low-ripple high-voltage power supply and a design method thereof. Background technique [0002] The high-voltage power supply is the key equipment in the X-ray imaging system. The ripple and accuracy of the output voltage determine the clarity of the imaging, and for precision equipment, the ripple is a fatal hazard. Since high-frequency inverter technology is used in X-ray imaging systems, designing high-voltage power supplies with small output voltage ripple and high precision has been the mainstream research direction. With the improvement of living standards, the demand for high-voltage X-ray imaging systems in the medical and semiconductor industries is also increasing. The development of low-ripple high-voltage power supplies that are widely used in medical and semiconductor non-destructive testing meets the urgent needs of the market. [0003] At pr...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/04H02M7/5387H02M1/14
CPCH02M3/33569H02M7/04H02M7/53871H02M1/14H02M1/0038H02M1/0058Y02B70/10
Inventor 张治国郭翔汪志勇
Owner ECU ELECTRONICS INDAL
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