Voltage Mode Control of Integrated Boost Series Parallel Fly-Back Converter for Energy Storage Applications

This paper presents a single switch based Integrated Boost series parallel fly-back converter has been presented. In the proposed converter the conversion efficiency of power is improved and the switching stress of the MOSFET switch is also reduced. In this converter there are two sub-stages. One is boost-fly-back semi stage which improves power transfer from input to load. The second one is dc-dc fly-back semi stage that provides good output voltage regulation. The bulk capacitors are connected in series with primary windings of 2:1 fly-back transformer which reduces switch stress and improves voltage regulation; the parallel connection improves the efficiency. The Operating modes of Integrated Boost Series Parallel Fly-Back Converter (IBSPFC) have been investigated. Additionally the computation process of bulk capacitor voltage, fly-back inductance and other key parameters are also presented. Also in this paper, a voltage mode control is used to control the MOSFET switch of IBSPFC which provides good voltage regulation. Simulation has been carried out on 25V input, 150Voutput and 200W isolated dc-dc converter functioning at 100 kHz frequency and the results are presented. Simulation results show the performance Improvement of proposed controller.