Comparison of GaN and silicon FET-based active clamp flyback converters
This course demonstrates how an active clamp flyback converter achieves zero voltage switching (ZVS) and recycles the leakage energy of the transformer to improve efficiency in higher frequency operation. Although it is well known that switch node capacitance determines the circulating energy for ZVS, the capacitance-nonlinearity impact from each of the two primary-side switches and from the secondary synchronous rectifier has not been well understood. In this session, design tradeoffs with differing nonlinearity of junction capacitances from each of the switching devices are investigated across the full load to deep light load operation, and then proper control strategies to overcome the capacitance nonlinearity are proposed. Additionally, analytical equations and design procedures are developed with consideration to the nonlinearity impact.
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