Three-phase interleaved high-step-up converter with coupled-inductor-based voltage quadrupler

Abstract

This paper proposes a high-efficient DC-DC solution with the features of galvanic isolation, high-voltage gain, zero voltage switching operation, low input current ripple and high-power density. The converter is implemented by a three-phase coupled inductor bridge to remove the bulky input electrolytic capacitors. The introduced active clamp circuit recycles the energy stored in the leakage inductance and absorbs the voltage spikes on the main switch voltage. The series configuration with a voltage doubler at the second side contributes to a high-voltage gain and reduces the voltage stress across the rectifier devices. The output diode reverse-recovery problem is naturally mitigated by the leakage inductance of the coupled inductors. Moreover, the active control with a neutral-point potential balance and a phase-deficient operation of the proposed converter are also studied. A converter prototype is designed and evaluated to verify the theoretical analysis and demonstrate a superior performance over the prior studies.