Zero-current soft-switched high-frequency induction-heating inverter using bipolar-mode normally-off SITs

The authors present a voltage-fed/voltage-clamped high frequency induction heating quasi-resonant inverter circuit which uses a static induction transistor (B-SIT) for soft switching and a specially designed matching transformer which efficiently operates at zero-current soft-switching (ZCS) mode under a phase-shifting power regulation strategy. This voltage-clamped quasi-resonant inverter version using the newly developed B-SIT module is more suitable for modern induction heating and melting power supply in industrial production plants. Its operating principle is presented, including the control strategy, and its distinctive features are discussed. A detailed computer-aided characteristic analysis has been performed; various open-loop steady-state operating characteristics have been evaluated.<
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