The High Voltage Gain Coupled Inductor Boost-Zeta DC/DC Converter

Abstract

This paper presents boost-zeta DC/DC converters utilizing coupled inductors, suitable for applications in the field of new energy power generation. The converters have high voltage gain, lower power switch stress, and cost characteristics. The boost substructure of the converters contains a diode and buffer circuit, which can effectively suppress the voltage spike caused by leakage inductance, and ensure the power level and efficiency of the converters. This paper introduces the working principle and steady-state performance of the improved converter in the case of continuous and intermittent excitation inductor current, and compares it with other coupled inductor DC-DC converters in terms of voltage gain, power switch stress, efficiency, and circuit components. Finally, the improved converter is validated by simulation and experiment. A prototype is built in the laboratory to verify the correctness of the theoretical analysis.