Adaptive step-size digital controller for switching frequency auto-tuning

A switching frequency auto-tuning digital controller for a power converter with adaptive step-size is presented in this paper. The controller automatically tracks and finds the switching frequency of a power converter in order to achieve highest power conversion efficiency under variable conditions and load. The adaptive controller utilizes a proposed adaptive variable-step-size function to improve the convergence speed and convergences error. The auto-tuning controller with the proposed adaptive step-size function is discussed and verified in this paper.