A Novel Second Order Boost Converter with High-Gain and Low Switch Tube Voltage Stress

Aiming at the problem that the output voltage of the photovoltaic (PV) array is much lower than the voltage required by the grid-connected inverter in the grid-connected power generation system, a new type of second order boost converter with high-gain and low switching tube voltage stress is proposed. The proposed topology is based on the basic Boost circuit, including three switching capacitors and a boost inductor to increase the boost ratio. At the same time, the converter clamps the switching tube to suppress the voltage spike and greatly reduce the voltage stress of the switching tube. The converter circuit topology is simple, which reduces the cost and volume of the converter. The working principle of the converter is analyzed, and the boosting effect of the converter is verified by corresponding simulation and experiments, which proves the correctness of the theoretical analysis.