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Electronics 2019, 8(3), 352; https://doi.org/10.3390/electronics8030352

Power Balance Method using Coupled Shunt Inductor and Multiple-Input Transformer for ISOP LLC Converter

1
New Power Plasma Co., Ltd., 1198-7, Baran-ro, Seotan-myeon, Pyeongtaek-si, Gyeonggi-do 17703, Korea
2
Department of Control and Instrumentation Engineering, Korea National University of Transportation, Chungju (KS001) 27469, Korea
*
Author to whom correspondence should be addressed.
Received: 25 February 2019 / Revised: 18 March 2019 / Accepted: 20 March 2019 / Published: 22 March 2019
(This article belongs to the Special Issue Power Quality in Smart Grids)
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PDF [9387 KB, uploaded 25 March 2019]
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Abstract

High-capacity power-supply systems using a large input voltage typically improve efficiency and can be miniaturized by dividing the input voltage into multiple small voltages, thereby minimizing the stress on the switching element and thus materializing a fast switching function. When a large input voltage is divided into small voltages in series through a DC link capacitor, power is supplied to each converter and the power of each LLC (Inductor-Inductor-Capacitor) converter can be divided and converted. However, such LLC converters, which are configured by the division of the input voltage, have power imbalance due to the parameter variation between active and passive elements of the power board, which results in an increase in the stress and heat of a particular element. As this problem of power balance necessitates a design for securing a power margin and as the heated element increases its volume, the efficiency and reliability of the LLC converter are degenerated. Accordingly, this study attempted to solve the problem of the power imbalance of LLC converters at each level using a coupled shunt inductor and multiple-input transformers sharing magnetic coupling. View Full-Text
Keywords: LLC converter; multiple-input transformer; unbalancing control; coupled shunt inductor; ISOP LLC converter; multiple-input transformer; unbalancing control; coupled shunt inductor; ISOP
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hwang, S.-S.; Baek, S.-W.; Kim, H.-W. Power Balance Method using Coupled Shunt Inductor and Multiple-Input Transformer for ISOP LLC Converter. Electronics 2019, 8, 352.

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