Bidirectional current alternate control circuit for AC rectification power source

Abstract

The invention relates to a bidirectional current alternate control circuit for an AC rectification power source. The circuit comprises a PFC (Power Factor Correction) control circuit unit, a split-phase and dead time control circuit, an AC bidirectional current detection and control circuit and the like, wherein the AC bidirectional current detection and control circuit is connected with an AC power source and controls and drives two low-frequency switches, two high-frequency PWM (Pulse Width Modulation) switches and two synchronous rectifier tubes to work according to detected forward and reserve current signals of the AC power source, alternately output working frequency signals and high-frequency PWM signals as well as synchronous rectification signals; the split-phase and dead time control circuit receives and processes signals from the PFC control circuit unit and outputs the signals to a high-frequency PWM driving control circuit unit and a synchronous rectification driving control circuit unit to realize power factor correction; and the high-frequency PWM driving control circuit unit and the synchronous rectification driving control circuit unit ensure that the AC rectification power source has the highest efficiency while having the characteristic of high power factor. The AC bidirectional current detection and control circuit in the invention is simple and reliable and has low cost.

Description

technical field [0001] The present invention relates to the field of active power factor correction technology and AC rectification power supply technology, specifically refers to the ability to alternately output power frequency signals, high-frequency PWM signals and synchronous rectification signals to control two low-frequency switches according to the detected bidirectional current signals of alternating current A control circuit that works with two high-frequency PWM switches and two synchronous rectifier tubes to realize the active power factor correction and synchronous rectification functions of the AC rectified power supply. Background technique [0002] Existing AC rectifier power supplies generally use rectifier bridges for rectification. If the DC voltage needs to be stable and have a high power factor, the AC is firstly rectified by the rectifier bridge and then transformed by BOOST to output stable DC. There are at least 2 AC rectifier power supplies in the abo...

AI Technical Summary

Problems solved by technology

Therefore, the invention patent with application number 200910150125 cannot achieve the highest efficiency, and the control unit can only drive IGBTs with common emitters or field effect transistors with common sources, and cannot drive IGBTs with non-common emitters or field effect transistors with non-common sources. Tube

image 3 It is the flow chart of the application’s control unit to set the dead time at the zero-crossing point of the mains and detect the AC positive and negative half-cycle signals to control the on and off functions of switches S3 and S4. The control process and control circuit are relatively complicated.

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