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A Novel Hybrid ZCS ZVS Current Control Method for Micro-Inverters

Boundary current mode (BCM) zero voltage switching method is proposed to help inverters have better performances with higher conversion efficiency. But the modulations increase MOSFETs conduction losses and inductor core losses due to its rapidly changed bandwidth. In this paper, a novel hybrid current modulation, which combines zero current switching (ZCS) and zero voltage switching(ZVS) is proposed to further improve the efficiency and narrow the switching frequency range of the inverters. Finally, a 400W full-bridge inverter and a digital current control platform is built to give experimental results. The experimental results verify that higher efficiency can be achieved using the proposed new modulation.