In order to solve the voltage imbalance problem when super-capacitors are used in series, a series-parallel switching equalizing circuit based on super-capacitors is proposed. The circuit is only made up of the super-capacitors and switch tubes, without voltage detection systems and complicated control systems, through two sets of switches on and off to minimize voltage imbalance. Analyze the equalizing circuit working principle in detail, and constitute the super- capacitor storage system using six super capacitors with rated voltage is 3V in ...