An Ultrahigh Voltage Gain Hybrid-Connected Boost Converter With Ultralow Distributed Voltage Stress

This article proposed a novel hybrid-connected boost converter (HCBC) with ultrahigh step-up and ultralow voltage stress. At the input part, a traditional interleaved boost converter structure is adopted based on dual coupled inductors, which can reduce the input current ripple and ease the current stress flowing through main switches and magnetic elements. Then, the voltage doubling capacitors embedded in this circuit can lift voltage and clamp the voltage stress on switches. Therefore, it will not only increase the voltage gain, but also recycle the leakage energy of coupled inductor to alleviate the voltage spikes across the power switches. At the output, the dual secondary windings of coupled inductors are connected in series and combined with a capacitor-diode to form a voltage multiplier module, which is stacked on the output for higher voltage gain. The working principle and steady-state performance of the proposed converter are analyzed in detail, and a 400-W experimental prototype based on HCBC is built to verify the correctness of theoretical analysis.