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Delta Sigma Modulation of Controller Input Signal for the LED Light Driver
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 Title & Authors
Delta Sigma Modulation of Controller Input Signal for the LED Light Driver
Um, Kee-Hong;
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 Abstract
In this paper, we present the LED dimming control system by using ADPCM (Adaptive Differential Pulse Code Modulation). This ADPCM apparatus accurately controls the LED current with high resolution reducing the RFI (radio frequency interference) due to the spreading out of the harmonics of current of pulses. Additionally, this makes it easier to increase the accuracy of control operation. This study introduces to make a digitally controlled circuit for controlling LED with high-energy efficient by adopting pulse current to LED. The LED current drive system we designed are two systems, the digitally-controlled unit and analog switching mode power supply unit, can be developed separately. The simulation shows the sigma delta modulation of digital to analog converter`s output when the input level is 0.7. From this simulation, the output is approached to accurately 0.15% to target value with 510 pulses.
 Keywords
LED;CFL;DC/DC converter;D-S DAC;PWM;
 Language
English
 Cited by
 References
1.
The American heritage science dictionary. Houghton Mifflin Company. 2005. led and LED.

2.
Han Subin, A Design technology of LED light power supply, Jounal of KIIEE., Vol. 17. No. 2. 2003.4, pp. 39-49.

3.
Jim Williams, A Fourth Generation of LCD Backlight Technology Component and Measurement Improvements Refine Performance, Linear Technology Application Notes Nov., 1995 http://cds.linear.com/docs/en/application-note/an65fa.pdf

4.
Philips Lumileds Lighting Company, "Technical Datasheet DS 23",2006.

5.
Erickson, Robert W., Maksimovic, Dragan, "Fundamentals of Power Electronics", 2001.

6.
Soo-Yeub Yoo, "A Design of Digital LED Backlight Unit of LCD Display units", the 1stinternationalconferenceondisplayLEDs,invited paper,2007,11.

7.
www.fairchildsemi.com AN-4151, Half-Bridge LLC Resonant Converter Design Using FSFR-Series Fairchild Power Switch (FPSTM)

8.
NUD4001, High Current LED Driver, http://www.onsemi.com/pub_link/Collateral/NUD4001-D.PDF