Abstract：The traditional multiple-input flyback converter has a simple configuration, and it can be used in the system with two or more sources. It has a good application prospect in the low/medium power situation. However, the converter has some disadvantages such as complex transformer structure due to multiple primary windings, higher voltage stresses across the power switches, and the load can’t achieve power from a variety of energy sources simultaneously. This paper proposes a novel multiple-input flyback converter. The transformer has only one primary winding and the voltage stresses of the power switches are reduced. All the input sources can provide energy simultaneously or individually. A double-input flyback DC/DC converter is taken as an example to analyse its operating principle in detail. The voltage conversion ratio of the input and output voltage is deduced. Power management method of the proposed converter is proposed. Furthermore, a family of multiple-input isolated DC/DC converters is deduced. The experimental results of a 120W prototype verify the correction of the theoretical analysis and the effectiveness of the control strategy.
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2011, Vol. 26 
