Adaptive controlled-type zero-voltage switching inverter with bandwidth limitation

A high performance inverter requires high power density, high reliability, and low cost. An adaptive controlled-type soft-switching technique achieves high efficiency and requires no additional power devices or magnetic components but with inherent frequency variation. Based on the general full-bridge inverter topology, the change in frequency under various modulation modes and load properties are studied. In order to narrow the frequency variation range, a continuous current mode (CCM) with bandwidth limitation control scheme is proposed. An adaptive controlled-type zero-voltage switching inverter with analog-digital control platform is designed and built to verify the proposed control scheme. The experimental results show that the proposed current modulation scheme has fixed switching frequency.