An Online Maximum Efficiency Point Tracking Technique for Bidirectional Non-Inverting BuckBoost Converter Over Wide Power Range

This paper presents a novel approach for online tracking of the maximum efficiency point of a bidirectional noninverting buck-boost converter over a wide range of power levels. The proposed technique involves perturbing the phase shift of the gate driver signal and observing the input power and output power to maximize efficiency within both the zero-voltage switching quadrangle mode and the hard switching quadrangle mode. To achieve two modes of operation, a zero-voltage switching detecting circuit is built. This circuit helps detect whether the switching achieves zero voltage switching, sets the phase shift boundary, and adjusts dead time. To evaluate the effectiveness of the proposed approach, a 500W hardware prototype has been developed