Passive clamping single-phase single-grade bridge type power factor correcting convertor and control method thereof

Abstract

A passive clamping single-phase single-grade bridge type power factor correcting convertor and control method thereof belongs to the technical field of power and electron. The invention aims at solving the problems of large power frequency ripples at the output side, and slow circuit response speed of the existing single-grade power factor correcting circuit as well as the problem of generating voltage peak caused by the leakage inductance of a transformer when the transformer is employed to carry out electronic isolation on the input and output. The single-phase input rectification circuit of the invention converts an inputted single-phase alternating current into a direct current; an output bus is connected with a boost inductor, four switch pipe composition bridge structures, a diode and a clamping capacitance; the outgoing lines of the two bridge arm central points of the four switch pipe composition bridge structures are connected with a high-frequency transformer; the lateral sides thereof are connected with a single-phase output rectification circuit; the output end of the single-phase output rectification circuit is connected with an output filter capacitance and a load inparallel; in a switch period, the straight arm conducting and the aligning arm conducting of the switch pipes control alternatively. The invention is used for correcting the power factors.

Description

Passive clamp single-phase single-stage bridge type power factor correction converter and control method thereof Technical field The invention relates to a power factor correction technology, which belongs to the field of power electronics. Background technique The wide application of non-linear loads such as power electronic devices has brought about a large number of harmonics. Power factor correction (PFC) technology is mainly used to suppress harmonics generated by power electronic devices. Active power factor correction technology can be divided into two-stage type and single-stage type according to its circuit structure. In the two-stage power factor correction structure, the first stage is a power factor correction circuit whose main function is to improve the input power factor; the second stage is a DC / DC converter whose main function is to adjust the output voltage to match the load. The main advantage of the two-stage PFC is that each stage can be individually anal...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to solve the problem of large power frequency ripple on the output side of the current single-stage power factor correction structure. If the capacity of the output filter capacitor is increased, the response speed of the circuit will be slow, and when the transformer is used to electrically isolate the input and output The problem of voltage spikes generated by transformer leakage inductance exists, and a passive clamp single-phase single-stage bridge power factor correction converter and its control method are provided

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