Breaking performance limit of asynchronous control for non-inverting buck boost converter

摘要

Non-inverting Buck Boost converters (NIBB) have been utilized as interfacing converters for energy storage, due to the high steady-state efficiency offered by the asynchronous control. However, classical asynchronous control has inherent poor dynamic performance when the input and output voltages are near. To solve the problem, concept of “dynamic mode switching” is first proposed in this paper. Instead of limiting operation of NIBB to buck mode during voltage step-down conversion, and to boost mode during voltage step-up conversion, switching state is selected flexibly. Performance of proposed control strategy is compared with “the performance limit of asynchronous control” and “classical PI control”. The proposed dynamic mode switching shows improved voltage deviation and recovery time.