A Novel Soft-Switching Based Closed Loop KY Converter with Ripple-Free Current
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2018 by IJETT Journal|
|Year of Publication : 2018|
|Authors : SK. Saidalli, B. Seshagiri, V.S.N. Narasimha Raju
|DOI : 10.14445/22315381/IJETT-V56P209|
SK. Saidalli, B. Seshagiri, V.S.N. Narasimha Raju "A Novel Soft-Switching Based Closed Loop KY Converter with Ripple-Free Current", International Journal of Engineering Trends and Technology (IJETT), V56(1),46-53 February 2018. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
A soft-switching based closed loop KY converter with ripple-free output current is proposed. This converter is based on a voltage boosting converter, named KY converter. Initially the basic function of traditional KY boost converter with soft switching and also output current ripples is discussed. It is achieved by utilizing an auxiliary circuit to the KY boost converter, the zero-voltage-switching (ZVS) of power switches is achieved. Moreover, the auxiliary circuit cancels out the filter inductor current ripple. Then, ripple-free output current is achieved. For the improvement of the functionality of the KY boost converter the PI controller in voltage mode control path is used. Finally the output response of conventional boost converter and KY boost converter in open loop and closed loop of the methods are compared. A comparison study was conducted to characterize the output voltage ripple percentage, output current ripple percentage and switching losses of each switch in the converter. The switching loss is reduced and the system efficiency is improved. The operational principle and a steady-state analysis of the closed loop KY boost converter are provided in detail.
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KY converter, soft-switching, conventional boost converter, ripples free.