Analysis and Design of a High Step-Up Coupled-inductor DC-DC Converter with a Voltage Multiplier

The need for efficient and low cost high step-up dc-dc converters is imminent considering the steady growth of renewable energies, expansion of electric vehicles and several other emerging applications. In this paper, a high step-up dc-dc converter is proposed. The converter utilizes coupled inductors and a voltage multiplier to achieve high voltage gain. The circuit comprises a single switch, four diodes, a pair of coupled inductors and three capacitors. The control of the converter is implemented using a PWM control strategy. Voltage and current stresses of the components are low and high efficiency operation of the converter is obtained without using auxiliary circuits to reduce switching losses. The converter is analyzed in each mode, and the time equations are derived. A simulation is performed in Cadence Capture software for a 400W converter. Finally, the converter is compared with some converters of the same ilk to highlight its features.