Title :
Improve light load efficiency for synchronous rectifier buck converter
Author :
Zhou, Xunwei ; Donati, Mauro ; Amoroso, Luca ; Lee, Fred C.
Author_Institution :
Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
A DC/DC converter with high efficiency over very wide load range is necessary for many low voltage applications, such as battery supplied systems and microprocessor power supplies-voltage regulator module (VRM). In order to improve the efficiency of low-voltage power converters, synchronous rectifier technology is widely used. The disadvantage of this technology is low efficiency at light load. This paper proposes a new technology that can improve light load efficiency with very simple implementation. Since current sensors are not required, high density and high efficiency can be achieved that makes the whole circuit suitable for integration. In the paper, two application examples are given. Experimental results verified that this technology significantly improves synchronous rectifier buck converters light load efficiency
Keywords :
AC-DC power convertors; DC-DC power convertors; equivalent circuits; load (electric); power supplies to apparatus; rectifying circuits; voltage regulators; DC/DC power converter; application examples; density; efficiency; light load efficiency improvement; low voltage applications; microprocessor power supplies; synchronous rectifier buck converters; voltage regulator module; Batteries; Buck converters; Circuits; Data processing; Energy consumption; Frequency; Low voltage; Power supplies; Rectifiers; Regulators;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1999. APEC '99. Fourteenth Annual
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-5160-6
DOI :
10.1109/APEC.1999.749651
