Phase Shifted Power Control Strategy for Efficiency Improvement at Medium Power Region in Induction Cooktops Using Full-Bridge Series-Resonant Inverters

This paper proposes a phase shift power control method (PSCM) as an additional power control strategy for induction heating (IH) cooktops. When frequency power control method (FCM) is applied for IH cooktops using full-bridge series resonant inverter (FB-SRI), the switching loss of inverter increases since the switching frequency range becomes wider. By applying PSCM, losses from power conversion system (PCS) can be reduced which leads to higher system efficiency up to 1.5% at medium power region. To verify the validity of the proposed strategy, losses and efficiency analysis are performed through simulation with mathematical approach. In addition, the feasibility of the proposed strategy is verified by experimental results.