A Non-Resonant Direct AC–AC Converter Using Load Inductance for Voltage Control

This letter proposes a non-resonant AC–AC converter applicable to induction heating (IH) systems. The proposed converter directly converts commercial-frequency AC power into high-frequency AC power without a resonant capacitor. The proposed topology achieves voltage control using a load inductance of the IH load and adjusting the duty ratio of the half-bridge switches. As a result, the proposed converter requires neither a dedicated boost inductor nor a resonant capacitor, and it can achieve power control at a fixed switching frequency. The voltage control characteristics and power control capability are experimentally verified using a 100-V, 1-kW prototype experimental setup.