A new zero voltage switching resonant DC-link inverter with low voltage stress

A novel zero voltage switching (ZVS) voltage source inverter is presented to overcome the main problems of the resonant DC link type inverter with discrete pulse modulation, such as the subharmonic problem and high voltage stress (1.3~1.8 p.u.). The proposed ZVS inverter adopts a parallel resonant DC link and has pulsewidth modulation capability with minimum device voltage stress (1.0 p.u.). In addition, the design and control of the proposed inverter are fairly simple. The operational principle, a detailed analysis, and design procedures are described. A 7.5 kVA prototype inverter was implemented and tested with 20 kHz switching frequency. Experimental results verifying the principle of operation are shown