A constant frequency variable power regulated ZVS-PWM load resonant inverter for induction-heating appliance

This paper presents a novel type of voltage-fed quasi-load resonant half-bridge IGBT inverter operating at constant frequency variable power (CFVP) regulation scheme which is more suitable and acceptable for new high-frequency high power induction-heated (IH) cooking appliances. This application-specific high-frequency inverter using a new generation of specially-designed IGBTs can efficiently operate under a principle of ZVS-PWM control strategy. The operating principle of a new inverter circuit is presented together with its power regulation characteristics on the basis of its computer-aided simulation analysis and its experimental results. The steady-state characteristics of a cost effective quasi-resonant inverter developed for high-frequency IH cooking appliances such as multi-burner type IH cooker are discussed herein from a practical point of view.