Invention Grant
US08947003B2 Circuit and method for independent control of series connected light emitting diodes
有权
用于独立控制串联连接的发光二极管的电路和方法
- Patent Title: Circuit and method for independent control of series connected light emitting diodes
- Patent Title (中): 用于独立控制串联连接的发光二极管的电路和方法
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Application No.: US13852068Application Date: 2013-03-28
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Publication No.: US08947003B2Publication Date: 2015-02-03
- Inventor: Pompilian Tofilescu , Alexander Ermilov
- Applicant: Flextronics Automotive Inc.
- Applicant Address: CA Newmarket, Ontario
- Assignee: Flextronics Automotive Inc.
- Current Assignee: Flextronics Automotive Inc.
- Current Assignee Address: CA Newmarket, Ontario
- Agency: Volpe and Koenig, P.C.
- Main IPC: H05B37/00
- IPC: H05B37/00 ; H05B33/08

Abstract:
Described herein is a circuit and method for independent control of series connected light emitting diodes (LEDs). The circuit includes a first light emitting diode (LED) connected in series with a second LED. A current source is connected in series with the first LED and the second LED and a shunt circuit is connected in parallel with the first LED and the second LED. The shunt circuit includes a pair of serially connected resistors. The shunt circuit prevents inadvertent excitement of the LEDs due to leakage currents but minimally affect illumination characteristics of the LEDs. A pair of transistors is connected to the first LED and the second LED, respectively, and is biased using a set of bias resistors. A tri-state control signal switches on and off the pair of transistors and enables excitation of the first LED, the second LED or both via the current source.
Public/Granted literature
- US20140292216A1 CIRCUIT AND METHOD FOR INDEPENDENT CONTROL OF SERIES CONNECTED LIGHT EMITTING DIODES Public/Granted day:2014-10-02
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