Investigation of candidate topologies for 12 V VRM

Author

Xu, Peng ; Wei, Jia ; Yao, Kaiwei ; Meng, Yu ; Lee, Fred C.

Author_Institution

Bradley Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

Volume

2

fYear

2002

fDate

2002

Firstpage

686

Abstract

With higher input voltages and lower output voltages, the most popular voltage regulator module (VRM) topology-the multiphase buck converter-operates at very small duty cycles. The influence of duty cycle on the performance of a multiphase buck converter is investigated and the results show that both the transient response and the efficiency suffer from the very small duty cycle. Alternative topologies with extended duty cycles are explored in order to improve the efficiency without comprising the transient response. The topologies under investigation are multiphase tapped-inductor buck converter, multiphase coupled-buck converter and improved multiphase coupled-buck converter with built-in filters

Keywords

DC-DC power convertors; computer power supplies; microprocessor chips; switching circuits; transient response; voltage regulators; 12 V; DC/DC power conversion; VRM topology; built-in filters; duty cycles; efficiency; improved multiphase coupled-buck converter; microprocessor power supplies; multiphase buck converter; multiphase coupled-buck converter; multiphase tapped-inductor buck converter; regulator modules; transient response; Buck converters; Capacitance; Circuit topology; Coupling circuits; Filters; Inductance; Inductors; Microprocessors; Transient response; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 2002. APEC 2002. Seventeenth Annual IEEE

Conference_Location

Dallas, TX

Print_ISBN

0-7803-7404-5

Type

conf

DOI

10.1109/APEC.2002.989320

Filename

989320