Error Amplifier Design of Peak Current Controlled (PCC) Buck LED Driver

Author

Marn-Go Kim

Author_Institution

Dept. of Control & Instrum. Eng., Pukyong Nat. Univ., Busan, South Korea

Volume

29

Issue

12

fYear

2014

fDate

Dec. 2014

Firstpage

6789

Lastpage

6795

Abstract

A discrete time-domain modeling and analysis for the peak current controlled (PCC) buck light-emitting diode (LED) driver is presented in this paper. The discrete time-domain equation representing the buck LED driver is derived and linearized about the equilibrium state. Also the switching control law, the proportional-integral compensator is used here as an example of the error amplifier, is linearized about the equilibrium state. The linearized buck LED driver and the control law are then combined to arrive at a linearized PCC buck LED driver. The root-locus method is employed to analyze the closed-loop system. The design guidelines and experimental results for the PCC buck LED driver are presented.

Keywords

PI control; closed loop systems; discrete time systems; driver circuits; electric current control; light emitting diodes; power amplifiers; root loci; time-domain analysis; buck LED driver; buck light-emitting diode driver; closed-loop system; discrete time-domain modeling; error amplifier design; peak current controlled buck led driver; proportional-integral compensator; root-locus method; switching control law; Equations; Inductors; Light emitting diodes; Mathematical model; Switches; Time-domain analysis; Buck light-emitting diode (LED) driver; discrete time-domain modeling; error amplifier design; root-locus stability analysis;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2014.2304739

Filename

6732998