A bidirectional LLC converter topology with auxiliary inductor added is proposed. The equivalent circuit of the circuit in forward and reverse operation is given, and the working modes of forward buck and reverse boost of the converter are analyzed. The converter is completely symmetrical in the forward and reverse working modes, and the control circuit is simple and easy to implement. At the same time, it can further reduce the transformer turns ratio and improve the conversion efficiency.

bidirectional; LLC; VCO(Voltage Controlled Oscillator);DC/DC, auxiliary inductance