Embedded controlled low-frequency AC to high-frequency AC converter fed induction heater

Purpose – The purpose of this paper is to present, a novel boost-active clamp bridge single stage high-frequency zero voltage soft-switching-pulse width modulation (ZVS-PWM) inverter, which converts the utility frequency AC power into high-frequency AC power with an embedded controller. This single stage high-frequency inverter is composed of a single-phase diode bridge rectifier, a non-smoothing filter, a boost-active clamp bridge type ZVS-PWM high-frequency inverter, and an induction-heated load with planar type litz wire working coil assembly. Also, the paper discusses how to extend the soft-switching operation ranges and improve power conversion efficiency. Design/methodology/approach – The proposed converter is simulated and it is implemented using embedded controller. Findings – It was found that the single stage high-frequency induction heating (IH) inverter using boosted voltage function can eliminate the DC and low-frequency components of the working coil current and reduce the power dissipation of the circuit components and switching devices. Originality/value – The paper shows that the PWM HF inverter is preferred for IH, since it has reduced switching losses and switching stresses. The paper can be extended to PC-based wireless control, which can be part of a distributed control system in major industrial heating systems.