Title :
Error Amplifier Design of Peak Current Controlled (PCC) Buck LED Driver
Author_Institution :
Dept. of Control & Instrum. Eng., Pukyong Nat. Univ., Busan, South Korea
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;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2014.2304739
