Abstract
Active-clamp flyback converter is now widely used because higher efficiency is obtained with soft-switching technique. However, opto-coupler is always applied in the feedback loop to acquire the output signal. To avoid the non-linearity and temperature drift of the opto-coupler, a constant current digital control method with peak current control is proposed for primary-side regulation active-clamp (PSRAC) flyback in this paper. Considering the charge balance principle, the output current can be calculated and controlled with primary-side control and only one low speed digital to analogy converter (DAC), two comparators and a digital unit are required in discontinuous conduction modulation (DCM) mode. Based on the proposed method, constant output current is realized. The proposed control scheme was verified by a FPGA controlled 2.00-10.00V/2.00A ac-dc PSRAC flyback converter.
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