Unity power factor control for dual active bridge converter

摘要

A dual active bridge converter, including high-frequency transformer- coupled input and output bridge converters, receives a rectified ac line voltage via a rectifier acting in a resistive mode and a small, high- frequency filter capacitor. A phase angle controller controls a phase shift between the voltages across the transformer windings such that high- efficiency dc-to-dc conversion is achieved, while maintaining unity power factor at the ac input, using high-density circuitry with small filter components and without adding additional front-end power factor correction circuitry.