Abstract
High switching frequency, high efficiency and high power density are critical in portable AC-DC adapters. The active clamp flyback (ACF) converter can achieve zero voltage switching (ZVS) and recycle leakage energy of transformer to maintain high efficiency in high frequency operation. This paper presents a digital PWM control method of secondary resonant ACF converter. A proposed adaptive period modulation is used to choose the optimum period under different conditions which can contribute to efficiency improvement. Meanwhile, a digital PI compensator is adopted to regulate the output voltage. A 65W prototype of ACF converter with digital microcontroller is implemented. With proposed digital control method, the prototype operates with 500-900 kHz frequency range and realizes maximum efficiency of 91.2% which is 2% better than control method at fixed frequency.
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