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

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...

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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 of converter has three resonant components to participate in energy transfer, the calculation and selection of resonant component parameters are more complicated, and the design of the control circuit is also more difficult due to the large number of resonant components.

At present, there is no literature or report on the high-voltage output low-ripple design method for the high-voltage power supplies of the two different topologies mentioned above.

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