Abstract: Based on maximum output current DC/ DC(Direct Current-Direct Current) converter to track the maximum power point of solar panels, fuzzy logic control theory is applied to solar power management circuits for intelligent charge and discharge management. DC/ DC converter mathematical model is established, the theoretical deduction is based on that the maximum output current tracks the maximum power point of solar panels. STM8L151K4T6 single-chip microcomputer is used to control Sepic converter circuit achieving the small power of 3 W solar panels of maximum power point tracking, to control the element battery for constant-current to constant voltage charge control and charge discharge protection, the experimental results validate the correctness and rationality of the design implimenting the optimal control circuits of solar power management.

Key words: maximum output current,  solar power, Fuzzy logic, maximum power point tracking(MPPT)