High gain QZS DC/DC converter with coupled inductor and capacitor switch

Abstract

This paper proposes a non-isolated quasi-Z- Source converter to feed a frequency inverter applied on a standalone photovoltaic tricycle. The converter uses the clipping voltage of the switch to be added to the output voltage, which allows reducing the duty cycle values and the gain of the converter. Some converter topologies, based on high gain coupled inductors and voltage multiplier cells cause large current ripple in the input and voltage spike at the switch. As a consequence the lifespan of the components and the converter efficiency are reduced. The proposed converter showed a low current ripple in the input and the switch was submitted to lower voltage, in comparison with previously studied topologies. High gain quasi-Z-Source dc-dc converters operation principle and analysis are shown, and verified by simulation and experimental results. The prototype of 250W was tested in laboratory and obtained a consistent operation with the theory.