Abstract
Energy stored in the resonant inductor is critical to the zero-voltage switching (ZVS) of power semiconductor devices in soft-switching active-clamping three-phase inverters. Traditionally, the soft-switching PWM timing parameters are designed based on calibrated data table. However, for motor drives or general-purpose AC power supplies, their fundamental output amplitude and frequency may vary, which makes control of the soft-switching inverter complex. It would be time-consuming and tiring to manually calibrate soft-switching timing control parameters under various operation conditions. In this paper, an adaptive soft-switching control of active-clamping three-phase inverters is proposed. The resonant inductor energy storage is adjusted to the optimal value automatically. Principles and implementation of the control are introduced. Parameters design of the adaptive control is discussed. Finally, the proposed method is verified by experiments.
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