Performance of the half-bridge (HB) zero-current-switched (ZCS) quasi-resonant converter (QRC) and zero-voltage-switched (ZVS) multiresonant converters (MRCs) are compared, with respect to their efficiency, input voltage range, semiconductor stresses, power density, and reliability. The efficiency of the HB ZVS-MRC at a given nominal input is shown to be highly dependent on the range of the input voltage, and it suffers when the converter has to be designed to cover a wide range. However, this is not the case for the HB ZCS-QRC. An experimental HB ZCS-QRC and HB ZVS-MRC, each with different input voltage ranges, were designed under the same constraints to facilitate their comparison. © 1990 IEEE