Design considerations and expiremantal results of an adaptive frequency controller under variable line and load conditions

This paper presents critical design guidelines and consideration for the adaptive step size function of the previously proposed ASSAT controller that tracks the optimum switching frequency with improved convergence speed and accuracy to maximize power converter efficiency. It is revealed how the adaptive step size function is affected by several factors and it is shown how the function should be designed to guarantee good convergence stability, speed, and accuracy. The design is verified by experimental results.