An Interleaved Buck-Boost-Zeta Converter With Coupled Inductor Multiplier Cell and Zero Input Current Ripple for High Step-Up Applications

Abstract

An interleaved Buck-Boost-Zeta converter with the coupled inductor multiplier cell and zero input current ripple is proposed in this paper, which is suitable for high step-up applications such as the photovoltaic generation system. By integrating the Buck-Boost converter with the Zeta converter and adding the coupling inductor voltage multiplier cell and the auxiliary input inductor, the proposed converter achieves very high voltage gain and very low switch voltage stress. At the same time, very low input current ripple and continuous output current can be achieved, which is friendly to photovoltaic arrays and DC-bus. The leakage inductance energy is absorbed by the passive clamp circuit, the zero-current-switching (ZCS) turn-on of the switch is achieved and the reverse recovery problem of the diode is alleviated. The operation principles and performances of the proposed converter are analyzed in detail. The proposed converter can further improve the voltage gain by adding different voltage multiplier cells and their general structures are given. A prototype with 32V input and 400V output was built to verify the theoretical analysis.

Keywords

• Coupled inductor
• high step-up
• Buck-Boost-Zeta converter
• zero input current ripple
• ZCS turn-on
• passive clamp