Control circuit, method and apparatus for soft-switching isolated buck-boost converter

Abstract

The application discloses a control circuit, method and device of a soft-switching isolated boost-buck converter, belonging to the field of power converters, comprising: a first input terminal of a flyback conversion module is connected to the midpoint of a voltage dividing capacitor of a boost-buck converter output voltage, and a second input terminal is grounded, and an output positive terminal value and an output negative terminal value are obtained through flyback conversion; a first terminal of an oscillation suppression module is connected to the rectified output voltage of the boost-buck converter, a second terminal is connected to the output positive terminal value of the flyback conversion module, a third terminal is connected to the output negative terminal value of the flyback conversion module, the rectified output voltage of the boost-buck converter is clamped for processing, and the oscillation of the boost-buck converter is suppressed. The application realizes adaptive oscillation suppression in the full input voltage range, significantly reduces system loss while ensuring the safety of device stress, and provides key technical support for the reliable application of the next generation of high-power-density solid-state transformers in AI data centers.

Images