An Improved Active-Clamped DC-DC Converter with Mod ified PI Controller
A new dual active-clamping dc-dc converter is proposed to obtain high efficiency. The proposed converter employs a dual active-clamping technique, while a resonant voltage doubler rectifier scheme controls the output voltage with the pulse width modulation technique. The dual active-clamping circuit serves to recycle the energy stored in the leakage inductor or the magnetizing inductor and provides zero-current turn-off switching. The voltage stresses of the main switches are clamped. The voltage transient spikes across the dual active-clamping circuit and the current stress of the current-fed side switches are limited by auxiliary dual active-clamping circuits on both sides, and zero-current switching is achieved. Also, to reduce the output voltage variation, a modified PI controller is suggested.