Efficiency Considerations in Resonant and Hard-Switched Medium-Power Switch-Mode Power Supplies

摘要

In recent years, the LLC resonant converter has become popular for implementing power supplies with high efficiency in the medium-power range, i.e. 200W to 1 kW. This work shows that equal or better efficiency can be obtained by using a hard-switched topology. The loss mechanisms in resonant and hard-switched topologies are introduced and contrasted. For verification, a hard-switched and a resonant power supply are analyzed by a detailed calorimetric loss evaluation.