High input voltage (48 V) multiphase VRM with feed-forward of the load current for fast dynamics

Author

Soto, A. ; Alou, P. ; Cobos, J.A. ; Uceda, J.

Author_Institution

Div. de Ingenieria Electron., Univ. Politecnica de Madrid, Spain

Volume

1

fYear

2004

fDate

20-25 June 2004

Firstpage

747

Abstract

This paper shows the goodness of the multiphase half bridge topology (two phases) for high input voltage (48 V), low output voltage (2 V) and high efficiency applications. The power stage is designed with a high current speed capability (20 A/μs) to reduce the size and cost of the output capacitors. The strong influence of the dynamics specs on the design of the power stage is analyzed in detail. Average current mode control is applied to assure current sharing between both phases and feed-forward of the load current (Richard Redl et al. 1986) is used to maximize the dynamic response of the average current mode control. Performance of this control method are explored and compared with other techniques.

Keywords

capacitors; dynamic response; electric current control; feedforward; power convertors; rectifiers; voltage regulators; 2 V; 48 V; average current mode control; capacitor; cost reduction; current sharing; dynamic response; feed-forward; half bridge topology; high efficiency application; multiphase VRM; multiphase voltage regulator module; power stage; Bridge circuits; Capacitors; Circuit faults; Feedforward systems; Low voltage; Magnetic multilayers; Magnetic separation; Switching frequency; Topology; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2004. PESC 04. 2004 IEEE 35th Annual

ISSN

0275-9306

Print_ISBN

0-7803-8399-0

Type

conf

DOI

10.1109/PESC.2004.1355842

Filename

1355842