NDLI: Peak-Efficiency Detection and Peak-Efficiency Tracking Algorithm for Switched-Mode DC

Content Provider	IEEE Xplore Digital Library
Author	Michal, V.
Copyright Year	1986
Abstract	In this paper, the system allowing to detect the peak-efficiency point of the periodically switching MOS power transistor is presented. The use of this system concerns namely the integrated dc-dc converters, charge pumps, class-E amplifiers, or isolated MOSFET power switches. Information about the peak-efficiency point position can be used to modify the power-switch operating conditions, which allows us to obtain the maximal available power-efficiency for a given operating point. The algorithm of the peak-efficiency tracking is developed here on the example of integrated 3.2 MHz step-down (buck) 5-A dc-dc converter. In this example, sizes of NMOS and PMOS power transistors are adjusted “on the fly,” in order to obtain the highest possible efficiency. In particular, power efficiency is optimized for the output current IOUT, battery and output voltages VBAT and VOUT, switching frequency fSW, temperature, and process variations. The principle of the method relies on the balancing of the Joule heat energy dissipated on the resistive elements, and energy dissipated during the charging process of the transistors' driving capacitances. As the result of the peak-efficiency tracking algorithm, the flat efficiency curve is obtained in a wide current range.
Sponsorship	IEEE Power Electronics Society
Starting Page	6555
Ending Page	6568
Page Count	14
File Size	1884966
File Format	PDF
ISSN	08858993
Volume Number	29
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitance MOSFET Power transistors Optimization Switches Logic gates power efficiency optimization High-efficiency dc–dc converter peak-efficiency detection
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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