LC Bidirectional Converter with Auxiliary LC Resonant Circuit and Operating Method thereof

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional converter having a secondary LC resonant circuit that implements constant current (CC) mode charging and constant voltage (CV) mode charging for high efficiency battery charging applications in a narrow switching frequency range, and a method of driving the primary winding. A transformer configured to perform voltage conversion, including a secondary winding; An auxiliary LC resonator connected to the transformer through a tertiary winding; Is connected to the primary side winding, the first switch ( ) To fourth switch ( A first converter transferring an input power transformed by the transformer to an output capacitor according to a switching operation of the first full-bridge circuit including a; And connected to the battery for supplying input power, the fifth switch ( ) To eighth switch ( And a second converting unit configured to transfer an input power supply to the secondary side winding according to a switching operation of the second full-bridge circuit.