Constant-frequency resonant inverter for AC-bus distribution system

A new constant-frequency DC-AC resonant inverter that employs a coupled inductor to achieve ZVS in an entire load and input voltage range with a reduced circulating current is described. The proposed technique is suitable for AC-bus distribution power systems in data-processing equipment. The performance of the proposed approach was evaluated on a 230 W inverter that delivers 1-MHz, 27-V/sub RMS/ AC output voltage from a 320 V-400 V DC input.