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JPE, Vol. 17, No. 3, May 2017
A Ripple-free Input Current Interleaved Converter with Dual Coupled Inductors for High Step-up Applications
Xuefeng Hu, Meng Zhang, Yongchao Li, Linpeng Li, and Guiyang Wu
Area Low Power Converters
Abstract This paper presents a ripple-free input current modified interleaved boost converter for high step-up applications. By integrating dual coupled inductors and voltage multiplier techniques, the proposed converter can reach a high step-up gain without an extremely high turn-ON period. In addition, a very small auxiliary inductor employed in series to the input dc source makes the input current ripple theoretically decreased to zero, which simplifies the design of the electromagnetic interference (EMI) filter. In addition, the voltage stresses on the semiconductor devices of the proposed converter are efficiently reduced, which makes high performance MOSFETs with low voltage rated and low resistance rDS(ON) available to reduce the cost and conduction loss. The operating principles and steady-state analyses of the proposed converter are introduced in detail. Finally, a prototype circuit rated at 400W with a 42-50V input voltage and a 400V output voltage is built and tested to verify the effectiveness of theoretical analysis. Experimental results show that an efficiency of 95.3% can be achieved.
Keyword Dual coupled inductors,High step-up,Modified interleaved boost converter,Ripple-free input current
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