Title :
Delay-Lock-Loop-Based Inductorless and Electrolytic Capacitorless Pseudo-Sine-Current Controller in LED Lighting Systems
Author :
Shao-Wei Chiu ; Chun-Chieh Kuo ; Yi-Ping Su ; Ke-Horng Chen
Author_Institution :
Inst. of Electr. Control Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
Light-emitting diode lighting system with the proposed pseudo-sine-current controller removes most of the external passive components, which include inductor, electrolytic capacitor, freewheel diode, blocking diode, and the bleeding circuit for Triac dimming control, for low cost and small volume. Delay-lock loop control can ensure the in-phase operation of ac input voltage and current for high power factor (PF) and low total harmonic distortion (THD). In addition, redundant power loss in Triac dimming control is eliminated to get a high efficiency of 85%. Furthermore, a high PF of 0.997 and a low THD of 7.74% are also achieved owing to in-phase line voltage and current.
Keywords :
delay lock loops; electric current control; harmonic distortion; light emitting diodes; lighting control; power factor; semiconductor switches; thyristors; LED lighting systems; THD; bleeding circuit; blocking diode; delay-lock-loop; electrolytic capacitorless pseudosine-current controller; freewheel diode; light-emitting diode lighting system; passive components; power factor; total harmonic distortion; triac dimming control; Hemorrhaging; Inductors; Light emitting diodes; Lighting; Switches; Thyristors; Electrolytic capacitor (E-cap); Triac dimming; Triac dimming.; light-emitting diode (LED) lighting system; pseudo-sine-current (PSC) controller;
Journal_Title :
Very Large Scale Integration (VLSI) Systems, IEEE Transactions on
DOI :
10.1109/TVLSI.2014.2368175
