A KIND OF LLC RESONANT CONVERTER FOR FULL VOLTAGE RANGE AND ITS CONTROL METHOD

摘要

This invention relates to a kind of LLC resonant converter for full inputvoltagerange and its control method, and belongs to LLC resonant power conversionfield.The technical solution: the current type main tank current sampler test themaintank current signal of the LLC resonant conversion circuit, and its outputsignal passesa rectifier then to be sent into the main tank energy quantifier connected toit. In thebus voltage range from 5% Vmax to Vmax, the main tank energy quantifier cancountthe remained LLC resonant main tank energy corresponding to measuring the bustransient voltage, and output a stable energy wave Vo, and if the remained LLCresonant energy falls down to a given energy value, the energy comparatoroutputcontrol signal and the controller controls the electronic switch deviceturning off, andthe corresponding electronic switch gains a ZVS in the next half workingperiod ofLLC resonant converter.This invention realizes the full voltage working range of LLC resonantconverterwhose reliability can get a fundamental guarantee. And it becomes true todesign aLLC converter to be a solid state converter. The lifetime of LLC converterwould beequivalent to the lifetime of semi permanent devices used in LLC converter. Itcan bewidely applied into some domains such as non-contact charging stations forelectricvehicle, electromagnetic inductance heating and switch power, etc.