This paper describes new 600-V trench highconductivity IGBTs (trench HiGTs) that have lower onstate voltages of 1.42 and 1.55 V at 200 NcmZ and tough short-circuit capabilities of 5 and 10 LL s, respectively. These HiGT have a better trade-off between turn-off losses and on-state voltages than conventional trench IGBTs, even better than planar IGBTs. They also offer a lower reverse transfer capacitances (-5PA) than the planar IGBT. The input capacitance obtained were lower (-30% to -60%) than that of a conventional trench IGBT.
In this paper, we present a buck-boost-full-bridge (BBFB) inverter that is a novel circuit topology developed for all-metals induction heating cookers. A power device of a full bridge inverter serves as a part of the H-bridge PAM (Pulse Amplitude Modulation) converter, thus reducing the number of power devices. In iron pan heating, it consists of a buck converter stage and a full bridge inverter stage with a boost function. On the other hand, in aluminum pan heating, it completely becomes independent of the H-bridge PAM converter stage and a single-ended push-pull (SEPP) inverter stage. For iron pan heating, the power conversion efficiency showed an approximately flat characteristic in a wide power range.
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