A Synchronous Switching Method for a Variable Frequency ZVS Boost Converter

Stainthorpe, B; Dahidah, M; Pickert, V

doi:10.1109/ECCE55643.2024.10860866

A Synchronous Switching Method for a Variable Frequency ZVS Boost Converter

Lookup NU author(s): Dr Ben Stainthorpe, Dr Mohamed Dahidah ORCiD, Professor Volker Pickert ORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

Using a synchronous FET in a DC-DC converter canmitigate diode conduction losses as the FET conduction voltageis much lower than the forward voltage of a diode. However,a synchronous topology does not feature natural self-switchingof a diode rectifier. A common converter switching methodachieves Zero Voltage Switching through Valley Switching in theBoundary Conduction Mode, using the natural self-switching ofthe output diode to indicate current decaying to zero, howevera synchronous topology is more complex to implement withthis method. In this paper, a novel method of implementing asynchronous FET with the Valley Switching method is presented,realized by predicting the inductor discharge time. An efficiencyincrease of up to 2.86% is found using the synchronous topologyand an estimated 93.59% of diode conduction loss is mitigated.The method is designed for high efficiency emergency LEDdrivers.