A more accurate steady state analysis of zero-voltage switching quasi-resonant converters

A more accurate steady state analysis of the zero-voltage switching quasi-resonant (ZVSQR) converter is conducted in this paper. The conversion ratio equation and the conditions to achieve zero-voltage switching (ZVS) are derived. According to the analysis, a ZVSQR converter can be designed to operate within a wider input voltage range. A ZVSQR inverted buck converter is simulated as an example to verify the analytical results.