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HUANG Jinfeng,XIE Feng,HAN Mengqi.Coupled-inductor Quadratic High Step-up Boost Converter[J].JOURNAL OF POWER SUPPLY,2021,19(2):15-21
Coupled-inductor Quadratic High Step-up Boost Converter
Received:March 25, 2020  Revised:January 28, 2021
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DOI:10.13234/j.issn.2095-2805.2021.2.15
Keywords:coupled-inductor  quadratic Boost converter  high step-up  low voltage stress
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HUANG Jinfeng School of Electrical Engineering, Shaanxi University of Technology, Hanzhong , China jfhuang2000@163.com
XIE Feng School of Electrical Engineering, Shaanxi University of Technology, Hanzhong , China
HAN Mengqi School of Electrical Engineering, Shaanxi University of Technology, Hanzhong , China
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Abstract:
      To solve the problems of large voltage stress in the power device of a quadratic Boost converter and the high voltage spike of the switch tube in a coupled-inductor Boost converter, a coupled-inductor Quadratic high step-up Boost converter is proposed by combining the characteristics of the quadratic Boost converter and the coupled-inductor Boost converter. This converter can absorb the leakage inductance energy, suppress the voltage spike across the switch tube, and transfer the absorbed leakage inductance energy to the load, thus improving the working efficiency of the converter. It introduces a bridge-type voltage doubler unit so that it can rectify the AC voltage across the secondary coil of the coupled-inductor into DC voltage while increasing the converter's voltage gain, which reduces the voltage stress in the output diode. By rationally designing the coupling coefficient of the coupled-inductor, zero current on and off of the power switch and zero current off of the output diode can be realized, thereby improving the working efficiency of the converter. The voltage stress in all power devices of this circuit topology is lower than the output voltage, so the power devices with low withstand voltage and low parasitic parameters can be selected, which reduces the cost of the converter. Finally, an experimental prototype of 100 W rated power was built, and its measured efficiency reached 92% at the rated power. Experimental results verified the theoretical analysis.
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