Zero voltage soft switching converter with high input voltage

High input voltage to a converter decreases its efficiency because turn-on loss of a main switch increases in proportion to the square of the input voltage. To decrease turn-on loss, the authors examined a zero-voltage-switched quasiresonant power converter. It causes severe voltage stress, which is about four or five times the input voltage, on a main switch. They therefore investigated a converter using partial resonance to solve these problems, and devised a new circuit. They discuss desirable coupling of each transformer winding, the relationship between efficiency and the stray capacitance of a transformer, and the results of simulation