Capacitor-Based Multisource of Flyback-Type Power Collector

This paper presents a multisource power collection method based on electric addition in capacitors for renewable energy application. Instead of combining input sources in magnetic form, the proposed flyback-type collector combines input dc sources in electric form by adding up the electric energy together in the capacitors. With pulsewidth modulation (PWM) control, the proposed collector can draw power from three larger different dc sources and individually and simultaneously deliver it to the battery. The operating principle of the proposed collector with three different input stages has been analyzed in detail. The output voltage regulation and power budget can be achieved by the phase-shifted PWM control. Two prototypes of the collector system with three different dc voltage sources have been successfully implemented to verify the performance of the power collector.