An Interleaved Boost Converter with Parallel Input and Output Series for Renewable energy system

A novel non-isolated interleaved boost converter is proposed with high step-up conversion ratio, which integrates two coupled inductors and voltage multiplier cells. At the input, the primary sides of the double coupled inductors are connected in parallel, and the two blocking capacitors are separately embedded into every phase. So the converter inhibits current ripples of input, and reduced voltage stress for the semiconductor devices; At the output, the secondary sides of the two coupled inductors are connected in series to achieve the purpose of much higher voltage gain and lower voltage stress on the semiconductor devices. In addition, the leakage inductance energy of two coupled inductors can be absorbed and recycled to the output, and the problem of reverse-recovery for diodes can be effectively suppressed. The voltage balance of the output capacitors and input current sharing by two interleaved phases are realized through the double closed-loop control of voltage and current. Finally, a 400W laboratory prototype is built to verify the correctness of theoretical analysis.