A New Step-Up DC/DC Converter With Low Voltage and Current Stresses

Abstract

This paper presents a new high-voltage gain DC/DC converter for renewable energy applications. This converter can provide an ultra-high voltage gain in a low-duty cycle. Moreover, a three-winding coupled-inductor (TWCI) is combined with a quadratic boost circuit to extend the voltage gain ratio, which indicates more design flexibility. Also, the tertiary winding side of TWCI acts as a semi-trans-inverse manner. Thus, higher voltage gains can also be achieved at a very low number of turn ratios. Regenerative passive clamp circuits absorb and recycle the energy of the leakage energy of the TWCI and also mitigate voltage stresses of the active switches which are operated in simultaneous switching patterns. The main features of the suggested structure are its ultra-high voltage gain, low reverse recovery in diodes, low voltage stress across the switches, continuous input current with low ripple, and common ground between the input and output sides. The current sharing between the TWCI and input inductor minimizes the power loss of the magnetic components of the proposed circuit. Detailed steady-state and power loss analyses, as well as design considerations, are provided. Finally, a sample prototype (200 W, 25 V–400 V) is implemented to reconfirm the given theories.