An adjustable linear power supply with a phase-shift PWM tracking pre-regulator

Author

Yang, Yueh-Ru

Author_Institution

Inst. of Electro-mech. Eng., Ming-chi Univ. of Technol., Taipei, Taiwan

Volume

1

fYear

2004

fDate

2-6 Nov. 2004

Firstpage

576

Abstract

An adjustable linear DC power supply using a switching-type tracking pre-regulator is described in this paper. To improve circuit efficiency, a full-bridge phase-shift pulse-width-modulation (FBPS-PWM) converter is employed to pre-regulate the input voltage of the adjustable power supply. In the proposed circuit scheme, there are two control loops. One is the linear regulator loop and the other is the FBPS-PWM converter loop. While the linear regulator loop regulates the output, the converter loop tracks the voltage variation. The output voltage of the tracking FBPS PWM converter is always greater than the output voltage of the adjustable linear regulator 2.5 volts. To verify the proposed scheme, a one-kilowatt 0∼60 volts/20 amperes prototype circuit is built. Simulation and experimental results show that the proposed hybrid scheme can obtain the merits of high efficiency and low output ripple.

Keywords

PWM power convertors; switching convertors; 2.5 V; adjustable linear power supply; linear regulation loop; phase-shift pulse-width-modulation converter; switching-type tracking pre-regulator; voltage variation; Circuit simulation; Power supplies; Prototypes; Pulse circuits; Pulse width modulation; Pulse width modulation converters; Pulsed power supplies; Regulators; Tracking loops; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics Society, 2004. IECON 2004. 30th Annual Conference of IEEE

Print_ISBN

0-7803-8730-9

Type

conf

DOI

10.1109/IECON.2004.1433372

Filename

1433372