Title:
LED DRIVER FOR IMPROVING POWER FACTOR
Document Type and Number:
WIPO Patent Application WO/2012/138200
Kind Code:
A2
Abstract:
The LED driver comprises: a power supply portion for supplying an input voltage; an inductor for receiving the input voltage and charging energy from the input voltage, wherein the energy drives at least one LED; a control portion for outputting a control signal based on the input voltage and an inductor current which flows in the inductor; and a switch, which is switched according to the control signal, for supplying the charged energy to the LEDs. When compared to existing boost converter-type LED drivers, the present invention allows direct control on an input current, rather than controlling an output voltage, by eliminating a capacitor element, which is connected in parallel to an output end of the LED, and a rectifier diode which is serially connected between the inductor and one end of the LED, thereby improving the power factor.
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Inventors:
KIM JAE HA (KR)
KANG EUN CHUL (KR)
KANG EUN CHUL (KR)
Application Number:
PCT/KR2012/002672
Publication Date:
October 11, 2012
Filing Date:
April 09, 2012
Export Citation:
Assignee:
MRCLAB CO LTD (KR)
SNU R&DB FOUNDATION (KR)
KIM JAE HA (KR)
KANG EUN CHUL (KR)
SNU R&DB FOUNDATION (KR)
KIM JAE HA (KR)
KANG EUN CHUL (KR)
International Classes:
H05B37/02
Foreign References:
| KR20100084256A | 2010-07-26 | |||
| KR20100128923A | 2010-12-08 | |||
| JP2006238657A | 2006-09-07 | |||
| KR20090056567A | 2009-06-03 |
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Claims: