A Non Isolated Single-Switch High Step-Up Converter with Low Voltage Stress

Abstract: A non-isolated single switch high step-up converter with low voltage stress is presented in this paper. The converter is derived based on the conventional fly back converter. A clamping diode as well as a voltage doubler circuit is used in order to reduce the voltage stress across the switch and diodes. Another converter can also be derived by rearranging the components and adding a capacitor to the circuit. Since the converter has low voltage stress, lower voltage rated switch and diodes are used, which result in high efficiency with low conduction losses. The MATLAB simulation of the converter is done using 24V input voltage and 250V/125W output. The lower stress on the switch and diodes are verified by the simulation results.

Keywords: High step-up converter, low voltage stress, non-isolated, reverses recovery, single switch, voltage doubler.