Non-Isolated Ultra-High Step-Up DC-DC Converter Topology Using Coupled-Inductor Based Inverting Buck-Boost and Voltage Multipliers

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This paper introduces a non-isolated ultra-high voltage gain topology using the combination of the coupled-inductor-based inverting buck-boost converter (IBB) and voltage multiplier (VM) structure. In the proposed converter, an ultra-high step-up voltage gain can be achieved with a small duty cycle thanks to a coupled inductor and VMs. The voltage stress and the losses of the switches in the proposed converter are even less compared to other conventional topologies. Unlike other coupled-inductor topologies, a large voltage spike caused by the leakage inductance of the coupled inductor is smoothed by the capacitor in the voltage multiplier. In addition, ZVS turn-on for the switches and ZCS turn-off for the diodes can be achieved with the energy stored in the leakage inductance. A 360W (40V/380V) prototype converter is implemented to prove the advantages of the proposed converter, with a maximum efficiency of 98.4%.

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