Regenerative Snubber Based Bootstrapped Gate Driver Power Supply for Multiple Input Flyback Converter

In recent years, multiple-input converters are emerging as a viable solution for applications where interfacing several sources with a common dc bus is required. The multiple input flyback converter (MFC) is suited for low power applications requiring galvanic isolation. This paper presents a regenerative snubber based bootstrapped gate driver power supply for an MIFC for low input voltage applications. The proposed circuit uses the leakage inductance energy to charge the bootstrap capacitors in each switching cycle. One diode, one resistor, and one capacitor is used for each input source in the proposed circuit. The proposed circuit results in lower overall cost, volume, and losses than conventionally used isolated gate driver supplies. The operating principle and design considerations are discussed. Furthermore, simulation and experimental results are presented to validate the working of the proposed circuit.