Chikanori Takami

A New Current Phasor-Controlled ZVS Twin Half-Bridge High-Frequency Resonant Inverter for Induction Heating

A novel soft-switching high-frequency (HF) resonant (HF-R) inverter for induction heating (IH) applications is presented in this paper. By adopting the current phasor control of changing a phase shift (PS) angle between two half-bridge inverter units, the IH load resonant current can be regulated continuously under the condition of wide-range soft-switching operations. In addition to this, the dual-mode power regulation scheme-based PS angle control and asymmetrical pulsewidth modulation in one inverter unit is proposed for improving the efficiency in low output power settings. The essential performances on the output power regulation and soft-switching operations are demonstrated in an experiment using its 1-kW 60-kHz HF-R inverter prototype, and then, the topological validity is evaluated from a practical point of view.

A new ZVS phase-shifted high-frequency resonant inverter incorporating asymmetrical PWM-based unit control for induction heating

A novel high-frequency (HF) soft switching resonant inverter for induction heating (IH) applications is presented in this paper. By adopting the phase shift-controlled two-inverter mode and the asymmetrical PWM-based single-inverter mode, the IH load resonant current can be regulated continuously under the full-load range soft switching conditions with maintaining high efficiency. The essential performances on the output power control and soft switching operations are demonstrated in experiments using a 450W-70 kHz prototype, then its topological validity is evaluated from the practical point of view.

A new dual mode current phasor-controlled ZVS high-frequency resonant inverter for induction heating

A novel soft-switching high-frequency (HF) resonant (HF-R) inverter for induction heating (IH) applications is presented in this paper. By adopting the phase shift (PS)-based current phasor (CP)-controlled, the IH load resonant current can be continuously regulated under the wide-range soft-switching conditions. In order to improve the conversion efficiency in the light load region, the pulse-density-modulation (PDM) is employed for the CP-controlled HF-R inverter, thus creating PS& PDM dual mode CP-control scheme. The essential performances on the output power regulation and soft-switching operations are demonstrated in experiments using a 1 kW-60 kHz prototype, and then its topological validity is evaluated from the practical point of view.