A new ZVCS resonant voltage-fed push-pull converter for vehicle inverter application

In this paper, a new zero voltage current switching (ZVCS) resonant voltage-fed push-pull converter for vehicle inverter application is proposed. It achieves ZCS off of the secondary diodes with using secondary leakage inductance as resonant element. By selecting appropriate dead time, the proposed circuit can also feature ZVS on of MOSFETs. The proposed topology can achieve satisfying performance in terms of voltage conversion ratio, efficiency, cost and volume, compared with four different secondary structures. Burst mode is used to guarantee the bus voltage under 500V in the whole input voltage range. At last, a 150W prototype with 10.8V-16Vdc input voltage, 220Vac, 50Hz output voltage is implemented to validate the operation, features, and burst mode characteristic. The measured efficiency is more than 95.6% and 93.3% in the whole input voltage range when output power is 150W and 60W, respectively.