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A novel soft-switching PWM utility frequency AC to high-frequency AC power conversion circuit, incorporating boost-half-bridge inverter topology, which is more suitable and acceptable for cost effective consumer induction heating applications, is presented. The operating principle and the operation modes are described using equivalent circuits with the operating voltage and current waveforms. The operating performances are illustrated and evaluated, including the power regulation and power conversion efficiency against duty cycle characteristics based on the power dissipation as compared with those of the previously developed high-frequency inverter. The practical effectiveness of the power converter is substantially proved, based on experimental results from a practical design example. [ABSTRACT FROM AUTHOR]

A new hybrid control scheme of the active-clamped class E (ACCE) inverter for an induction heating jar is presented. The proposed hybrid control scheme has characteristics that act as a class E inverter at lower switch voltages and ACCE inverter at higher switch voltages than the reference voltage of the main switch by feeding back voltage of the switch and also has advantages of conventional ACCE inverter such as zero-voltage-switching of the main switch and the reduced switch voltage due to the clamping circuit. The proposed hybrid control method using ACCE inverter also has higher output power than the conventional control scheme since the ACCE inverter is operated like a Class E inverter at low input voltage. The principles of the proposed control are explained in detail and the validity of the proposed control scheme is verified through several simulated and experimental results. [ABSTRACT FROM AUTHOR]

Abstract:In this paper the dynamic analysis of the open-and closed-loop systems of a new single- switch AC --AC frequency converter is presented.The main advantages of the proposed converter are that it provides a sine wave input current and a close to unit power factor.The converter circuit dynamic analysis is performed in small-signal quantities.The analytical expressions of the transfer function of the open and closed-loop systems with the integrator regulator are obtained.The results of the theoretical analysis were checked on the PSPICE-model and on the laboratory prototype and they are in good agreement with the experiments. [ABSTRACT FROM AUTHOR]

Abstract:A novel single-ended push pull (SEPP)soft-switching high-frequency inverter for induction-heating applications with a continuous output power regulation scheme at a .xed frequency incorporating a novel lossless snubber circuit is presented.Conventional SEPP high- frequency inverters have been .nding their home-electronic applications owing to their simpli .ed circuit constitutions.However,their soft-switching operations were restricted in a relatively narrow output power range when they were controlled by a PWM technique.The proposed high- frequency inverter topology is based on the conventional SEPP high-frequency inverter together with a novel lossless snubber circuit operated at an auxiliary resonant frequency so that it can be operated under soft-switching as well as PWM regulations.Hence,the soft-switching operation range of the proposed inverter can be widened considering accompanied by a high ef .ciency compared with the conventional SEPP inverter.Uses can include a home-cooking application with a high thermal ef .ciency and high safety at a .xed frequency of 20 kHz.The operating principle,is described and the results of computer-aided simulation analysis of the circuit operation and evaluation of the performance of the proposed inverter are given,which show its high utility. [ABSTRACT FROM AUTHOR]

Discusses a cost effective phase shifted pulse modulation soft switching high frequency inverter for induction heating applications. Theoretical equations for the soft switching operation region derived from the practical consideration of the gate pulse control strategy; Consideration given on how much the effect of soft switching can improve actual efficiency.

Introduces a single-switch parallel resonant converter for induction heating. Steady-state analysis of the converter operation; Improved modification of the single-switch AC-AC converter for induction heating applications.

Proposes a prototype of a series-load resonant and quasi-resonant hybrid-type soft-switching high frequency inverter for induction heating applications, together with its operating principle. Design procedure of circuit components to achieve a soft-switching the high frequency inverter; Reduction effect of switch peak voltage stress and its power regulation performance.