Abstract
An interleaved high-step-up current sharing DC–DC converter with coupled inductors is proposed in this paper. The operation principle and property of this converter are analyzed. The ripple of the input current in the proposed converter is decreased significantly by using the two-phase parallel interleaved input. The voltage gain is extended and the switch voltage stress is reduced by the coupled inductors. The leakage inductance of the coupled inductors reduces the reverse-recovery problem of the output diode, resulting in the reduction of reverse-recovery losses. As there are two interleaved phases in the proposed converter, the third winding of each coupled inductor is embedded in another phase. With this design, when the leakage inductance or duty cycle is asymmetrical, the current sharing performance is still positive. Consequently, the new topology is very suitable for applications to occasions with low voltage input and high voltage output, such as the fuel cell power system. Finally, the performance of this topological circuit is verified by a prototype with 500 W output.
Highlights
Due to the public awareness of climate change and strict emission regulations issued by governments, automobile companies are trying to develop low emission or zero emission vehicles [1]
Voltage gain is increased significantly by a multiplier unit composed of coupled inductor and capacitance and the main switch voltage stress is decreased greatly since the coupled inductor has the functions of transformer
Energies of leakage inductance are absorbed by clamping circuit and the rate of current reduction of the output diode is limited by leakage inductance, alleviating the reverse-recovery problem of the output diode
Summary
Due to the public awareness of climate change and strict emission regulations issued by governments, automobile companies are trying to develop low emission or zero emission vehicles [1]. In the electric vehicle system with low voltage and high current battery, in order to control the DC side voltage, a DC–DC converter is required to boost the battery voltage. This converter must have large voltage gain, low switch stress and input current ripple and high conversion efficiency. Traditional boost converters have many disadvantages, including large ripples of input current and high switch voltage stress. Ripples of current of different phases are offset mutually through the interleaved parallel connection [13,14] This decreases riinptpelrelseaovfeindppuatrcaullrerlecnotnannedctiinocnre[a13se,1s4p].oAwletrholeuvgehl stihginsidfieccarnetalyse, sthreipspwleitschofvionlptaugtecustrrreesnst isanredlainticvreelayselasrpgoewanerdltehveelgsaiignniisfircealnattliyv,etlhyelsowwi.tch voltage stress is relatively large and the gainTihsereilnatteivrleelayvleodwp.
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