DocumentCode :
1092115
Title :
Analysis and Design of Voltage Regulator With Adaptive FET Modulation Scheme and Improved Efficiency
Author :
Abdel-Rahman, Osama ; Abu-Qahouq, Jaber A. ; Huang, Lilly ; Batarseh, Issa
Author_Institution :
Univ. of Central Florida, Orlando
Volume :
23
Issue :
2
fYear :
2008
fDate :
3/1/2008 12:00:00 AM
Firstpage :
896
Lastpage :
906
Abstract :
This paper presents a load adaptive voltage regulator that achieves high efficiency extended to light and heavy load regions. The presented method is named as adaptive field effect transistor modulation (AFM) since multiple field effect transistors (FETs) with different characteristics (different sizes) are applied in parallel such that the number of driven FETs and their respective gate driving voltage are adaptive to load current. The capability of adaptive modulation of FETs´ parasitic charges and resistances along with adaptive gate driving voltage allows the optimization of equivalent FET characteristics over a wide load range. Moreover, the AFM operation under load dynamic conditions is studied and a scheme is proposed. The AFM operates at a fixed switching frequency for almost the entire load range. Therefore, it has no impact on the operation and the dynamic performance of a conventional buck VR, and it is easy to implement. In this paper, the concept, design and theoretical analysis of the AFM are discussed and verified experimentally. Even though the simulation and experimental works design example given in this paper is for lower power and low voltage converter with discrete components for demonstration purposes, the AFM may have better improvement in higher power and/or higher voltage applications and in integrated voltage regulators.
Keywords :
DC-DC power convertors; adaptive modulation; field effect transistors; integrated circuit design; voltage regulators; adaptive FET modulation scheme; adaptive control; adaptive field effect transistor modulation; adaptive gate driving voltage; conventional buck VR; discrete components; dynamic response; equivalent FET characteristics; fixed switching frequency; integrated voltage regulators; load adaptive voltage regulator; load current; load dynamic conditions; low voltage converter; parasitic charges; parasitic resistances; switch modulation; FETs; Frequency conversion; Frequency modulation; Optical modulation; Pulse width modulation; Regulators; Switches; Switching frequency; Virtual reality; Voltage; Adaptive control; converter; dc–dc; dynamic response; efficiency; fixed frequency; heavy load; light load; performance; switch modulation; variable frequency; voltage regulator;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2007.915184
Filename :
4463843
Link To Document :
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