High efficiency zero-voltage switching (ZVS) assistance circuit for power converter

摘要

A system includes a power converter configured to convert input power into output power. The power converter includes first and second converter bridges, where each converter bridge includes multiple transistors. The system also includes a zero-voltage switching (ZVS) assistance circuit having first and second inverse controlled rectifiers (ICRs). Each of the first and second ICRs is configured to provide current to the transistors in the first and second converter bridges. The system further includes a controller configured to control operation of the first and second converter bridges and the ZVS assistance circuit. The controller could include a phase-shift modulation (PSM) controller configured to control the converter bridges and a pulse width modulation (PWM) controller configured to control the ZVS assistance circuit. The PWM controller can be configured to apply pre-shaped voltages to transistors in regulators of the ICRs to enable substantially zero-loss turn-off commutation of the transistors in the regulators.

主权项

1. An apparatus comprising:
a power converter configured to convert input power into output power, the power converter comprising first and second converter bridges, each converter bridge comprising multiple transistors; and a zero-voltage switching (ZVS) assistance circuit comprising first and second inverse controlled rectifiers (ICRs), each of the first and second ICRs configured to provide current to the transistors in the first and second converter bridges, each of the first and second ICRs comprising a rectifier connected to a regulator, wherein the regulator in the first ICR is configured to regulate the current that is provided by the first ICR and the regulator in the second ICR is configured to regulate the current that is provided by the second ICR.