Parallel interleaving BUCK converter and control method

Abstract

The invention provides a parallel interleaving BUCK converter and a control method. The converter comprises a direct-current voltage source, a parallel interleaving BUCK circuit, a sampling circuit, a digital signal processor and a PWM (Pulse Width Modulation) driver, wherein the parallel interleaving BUCK circuit is connected with the direct-current voltage source and comprises two sets of parallel rectifier switch transistors and two sets of fly-wheel switch transistors connected with the two sets of the rectifier switch transistors; each set of the rectifier switch transistors and each set of the fly-wheel switch transistors comprise two parallel MOSFETs (Metal Oxide Semiconductor Field Effect Transistors); the sampling circuit performs sampling on an output voltage and an output current of the parallel interleaving BUCK circuit and outputs a sampling result; the digital signal processor is connected with the sampling circuit, processes the sampling result according to a fuzzy genetic algorithm to obtain a duty ratio signal, and outputs a PWM wave corresponding to the duty ratio signal; and the PWM driver is connected with the parallel interleaving BUCK circuit and the digital signal processor, controls the two sets of the rectifier switch transistors to be switched on at an interleaving angle of 180 degrees according to the PWM wave, and controls the two sets of the fly-wheel switch transistors to be switched on at the interleaving angle of 180 degrees.

Description

technical field [0001] The invention relates to the technical field of converters, in particular to a parallel interleaved BUCK converter and a control method. Background technique [0002] In AC small signal analysis, BUCK switching converters can be divided into voltage control and current control according to the control mode. The voltage-controlled converter has only one voltage loop, and the output voltage is used as a feedback signal to realize voltage closed-loop control. The current-controlled converter includes two closed-loop control loops, the current inner loop and the voltage outer loop. The output voltage and the main circuit current (inductor or power switch tube current) are used as feedback signals to realize full-state feedback, and the voltage outer loop realizes automatic adjustment of the output voltage. , the current inner loop realizes the automatic adjustment of the main circuit current, which can achieve the optimal control effect. Since the main c...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a parallel interleaved BUCK converter and a control method to solve the problems of low conversion efficiency and poor dynamic response performance of existing converters

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