Title:
CURRENT SENSING TRANSISTOR LADDER DRIVER FOR LIGHT EMITTING DIODES
Document Type and Number:
WIPO Patent Application WO/2012/109044
Kind Code:
A3
Abstract:
Ladder network circuits for controlling operation of light emitting diodes (LEDS) based upon current sensing. The circuits include a number of light sections connected in series. Each light section includes an LED device comprising at least one LED junction, a current sensing feedback circuit coupled to the LED device, and a switch coupled to the current sensing feedback circuit and the LED device for controlling activation and current through the LED device. The current sensing feedback circuit is configured to generate a sensing signal indicative of current through the LED device, generate a feedback signal based upon the sensing signal, and provide the feedback signal to the switch.
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Inventors:
VOS MARTIN J (US)
Application Number:
PCT/US2012/023209
Publication Date:
November 22, 2012
Filing Date:
January 31, 2012
Export Citation:
Assignee:
3M INNOVATIVE PROPERTIES CO (US)
VOS MARTIN J (US)
VOS MARTIN J (US)
International Classes:
H05B37/02
Domestic Patent References:
| WO2009138104A1 | 2009-11-19 | |||
| WO2009153696A1 | 2009-12-23 |
Foreign References:
| JP2007123562A | 2007-05-17 | |||
| US20090066267A1 | 2009-03-12 | |||
| JP2006244848A | 2006-09-14 |
Attorney, Agent or Firm:
HUANG, X. Christina et al. (Office of Intellectual Property CounselPost Office Box 3342, Saint Paul MN, US)
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