High performance voltage regulator for high step-down DC-DC conversion

Author

Panguloori, RakeshBabu ; Kastha, Debaprasad ; Patra, Amit ; Capodivacca, Giovanni

Author_Institution

Dept. of Electr. Eng., Indian Inst. of Technol., Kharagpur

fYear

2008

fDate

10-13 Nov. 2008

Firstpage

761

Lastpage

765

Abstract

The duty cycle of the conventional multi-phase buck converter becomes extremely small as the output voltage becomes lower and lower. This is a severe challenge as the switching frequency goes up. This paper presents a power circuit architecture to improve the efficiency of the laptop computer CPU Voltage Regulator (VR) by extending the duty cycle while improving the dynamic performance as well. The power circuit architecture is composed of an isolated full bridge current doubler rectifier converter in parallel with the buck converter. In this paper, the power circuit architecture, the proposed control scheme and the operation principle are discussed. A 9~19 V input, 1V/45A output, 450 kHz system has been designed and simulated using SABER. The simulation results shows improvement in the dynamic performance.

Keywords

DC-DC power convertors; bridge circuits; computer power supplies; rectifiers; switching convertors; voltage regulators; control scheme; current 45 A; duty cycle; dynamic performance; frequency 450 kHz; full bridge current doubler rectifier converter; laptop computer CPU voltage regulator; multiphase buck converter; power circuit architecture; step-down DC-DC conversion; switching frequency; voltage 1 V; voltage 9 V to 19 V; voltage regulator; Bridge circuits; Buck converters; Circuit simulation; Computer architecture; Portable computers; Rectifiers; Regulators; Switching frequency; Virtual reality; Voltage; Adaptive Voltage Positioning (AVP); Full-Bridge Current Doubler Rectifier (FBCDR); Hysteretic constant turn-off control; Voltage Regulator (VR);

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, 2008. IECON 2008. 34th Annual Conference of IEEE

Conference_Location

Orlando, FL

ISSN

1553-572X

Print_ISBN

978-1-4244-1767-4

Electronic_ISBN

1553-572X

Type

conf

DOI

10.1109/IECON.2008.4758049

Filename

4758049