Accurate power-loss estimation for synchronous buck converters

This paper presents an accurate power-loss estimation method for synchronous, continuous conduction-mode buck converters. The parasitic capacitance of a metal oxide semiconductor field-effect transistor (MOSFET) is a principal cause of switching loss. A realistic analysis for the switching losses on...

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Bibliographic Details
Published in:Journal of the Chinese Institute of Engineers 2015-02, Vol.38 (2), p.247-259
Main Authors: Chiu, Huang-Jen, Lo, Yu-Kang, Li, Chia-Hsing, Quang, Nha-Trong
Format: Article
Language:English
Subjects:
junction temperature
parasitic capacitor
power-loss estimation
switching loss
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Summary:This paper presents an accurate power-loss estimation method for synchronous, continuous conduction-mode buck converters. The parasitic capacitance of a metal oxide semiconductor field-effect transistor (MOSFET) is a principal cause of switching loss. A realistic analysis for the switching losses on power MOSFETs has been thoroughly investigated in this paper. Considering thermal characteristics, the total power loss on a power MOSFET is calculated to predict the first junction temperature. At first integration, the junction temperature of a MOSFET is obtained and subsequently utilized to estimate resistance of the MOSFET to new integration. The process presented in this paper is repeated until the balanced junction temperature is achieved. Particularly, theoretical analysis and experimental results are shown and compared to validate the feasibility and reliability of the proposed method.
ISSN:0253-3839
2158-7299
DOI:10.1080/02533839.2014.955967