Design and analysis of a novel SEPIC-based multi-input DC/DC converter

A novel single-ended primary-inductor converter (SEPIC)-based multi-input DC/DC converter is presented. The structure inherits all the advantages of the SEPIC converter such as step-up/down capability without inverting the polarity of the regulated output voltage and using a series capacitor to couple energy from the input to the output. The presented converter has a bidirectional input port, in which the energy storage system (ESS) can be connected, and several unidirectional input ports. Hybridising several alternative energy sources is achievable by the proposed converter. In addition, the load power can be flexibly divided among various power sources. Due to the buck-boost characteristic of the presented converter, it is suitable to charge-discharge the ESS and to extract maximum power from the photovoltaic panels. Based on the charging state of the ESS, two operation modes are defined. Steady-state and dynamic behaviour of the proposed converter is analysed thoroughly. Experimental results are also provided to verify the analysis and feasibility of the proposed converter.

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