Adaptive Efficiency Optimization for the High-Step-Up Boost Converter Based on the Loss Analysis Model

In this paper, an adaptive-step-size frequency optimization algorithm (ASSFO) is used for tracking the maximum efficiency point of the high-step-up boost converter under variable conditions. Based on the analysis of losses of the converter, the desired switching frequency is selected depend upon input current value. The ASSFO function results in improved adaptive controller convergence speed, convergences error and stability. This algorithm is implemented in a prototype where converter continuously maintains the optimal switching frequency under varying load current. A 1-kW prototype is implemented to verify the proposed controller performance and proposed algo-rithm is verified successfully.