Conference Proceeding

Digital Sliding Mode Pulsed Current Averaging IC Drivers for High Brightness Light Emitting Diodes

Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA
08/2006; DOI:10.1109/COMPEL.2006.305665 pp.136 - 141 In proceeding of: Computers in Power Electronics, 2006. COMPEL '06. IEEE Workshops on
Source: IEEE Xplore

ABSTRACT This paper proposes a digital controller with sliding mode pulsed current averaging scheme for high-brightness (HB) light emitting diodes (LED) IC drivers. The digital controller implements a control method to adjust the 'on time' of the active switch based on the comparison of output current and a reference current. The idea is to increase or decrease the duty cycle by discrete pulses in order to control the average current being delivered to the load. A variable frequency boost converter in discontinuous conduction mode (DCM) has been used to handle the required load current. No external analog-to-digital (A/D) converter is required for the application

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Keywords

'on time'
 
average current
 
control method
 
digital controller
 
digital controller implements
 
discontinuous conduction mode
 
duty cycle
 
external analog-to-digital
 
mode pulsed current
 
reference current
 
required load current
 
variable frequency