Current type one-way DC-DC converter and symmetrical double PWM plus phase-shift control method

Abstract

The invention discloses a current type one-way DC-DC converter and a symmetrical double PWM plus phase-shift control method for controlling the converter, relates to the current type one-way DC-DC converter and the control method, and belongs to the field of power electronics. The converter is composed of a main circuit and a control circuit. The main circuit is composed of an input side and an output side. The control circuit comprises a controller and a drive circuit. The invention also discloses the symmetrical double PWM plus phase-shift control method for controlling the current type one-way DC-DC converter. With adjustment of a phase-shift control ring between low-voltage side voltage vab and high-voltage side voltage vcd and adjustment of switching tube duty ratio through a low-voltage side PWM control ring, current stress and circulating current loss are reduced and low-ripple operation of circuit input current is realized, switching tube current stress of the input side and circulating current loss of the converter are reduced, semi-active full-bridge switching tube ZVS soft switching of the output side and diode ZCS switching are realized and efficiency and reliability of the converter are enhanced.

Description

Technical field [0001] The invention relates to a current type unidirectional DC-DC converter and a symmetrical double PWM plus phase shift control method for controlling the converter, in particular to an isolated current type unidirectional DC-DC converter and its use The symmetrical double PWM plus phase shift control method for controlling the converter belongs to the direction of high frequency switching power supply in the field of power electronics. Background technique [0002] For power electronic applications such as fuel cells and photovoltaic power generation, there is a wide input voltage range, and it is desirable to have the smallest possible input current ripple. If the input current ripple is too large, the life of the fuel cell will be shortened, and the maximum tracking efficiency of the photovoltaic group will also be affected. For DC-DC converters. High transfer efficiency is a particularly important requirement. Zero voltage switching (ZVS) of power devic...

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Problems solved by technology

[0005] In order to overcome the problems that the above-mentioned converter cannot realize soft switching in the full load range, the controller design is complicated, and an additional clamping circuit is required, the present invention discloses a current-mode unidirectional DC-DC converter and a Controlled symmetrical dual PWM plus phase-shift control method, the technical problem to be solved is to reduce the current stress and circulation loss and realize the low ripple operation of the circuit input current, reduce the current stress of the switch tube on the input side and the circulation current of the converter loss, realize the ZVS soft switching of the semi-active full-bridge switching tube on the output side and the ZCS switching of the diode, and improve the efficiency and reliability of the converter

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