A double boost converter with PFC and Series/Parallel inputs connection for UPS systems

Abstract

This paper presents a double boost converter with power factor correction (PFC) suitable for parallel/series connected inputs, depending on the grid voltage value. Using the proposed converter is possible to eliminate the low-frequency autotransformer in input of the converter which allows UPS operation with two input voltage values (110V and 220V). The control strategy is based on the average current mode control and applied to both converters, in order to provide power factor correction and output voltage regulation. The simulation results for a 2.4 kW proposed converter are presented in order to demonstrate the proposed ideas.