Invention Grant
US08111009B2 Light adjustment circuit for alternating-current light emitting diodes (AC-LED's)
有权
交流发光二极管（AC-LED）的调光电路
- Patent Title: Light adjustment circuit for alternating-current light emitting diodes (AC-LED's)
- Patent Title (中): 交流发光二极管（AC-LED）的调光电路
-
Application No.: US12627197Application Date: 2009-11-30
-
Publication No.: US08111009B2Publication Date: 2012-02-07
- Inventor: Wen-Tien Tsai , Bing-Chwen Yang , Hwei-Shung Chong , Chung-Yue Chen , Yie-Tone Chen , Yao-Te Huang , Li-Ling Lee
- Applicant: Wen-Tien Tsai , Bing-Chwen Yang , Hwei-Shung Chong , Chung-Yue Chen , Yie-Tone Chen , Yao-Te Huang , Li-Ling Lee
- Applicant Address: TW Hsin-Chu
- Assignee: Industrial Technology Research Institute
- Current Assignee: Industrial Technology Research Institute
- Current Assignee Address: TW Hsin-Chu
- Agency: Morris Manning & Martin LLP
- Agent Tim Tingkang Xia, Esq.
- Priority: TW98130002A 20090907
- Main IPC: G05F1/00
- IPC: G05F1/00
Abstract:
A light adjustment circuit for alternating-current light emitting diodes (AC-LED's) connected to an AC power supply and a plurality of AC-LED's comprises: a light adjustment unit, being capable of modulating AC power from the AC power supply while providing the plurality of AC-LED's with the modulated AC power; and a pulse width modulation (PWM) control circuit, being capable of modulating an external voltage signal in correspondence to variation in input AC power to enable each of the AC-LED's to achieve a predetermined brightness; wherein the AC-LED's are turned off by modulating the external voltage signal to prevent the AC-LED's from being burnt out when the input AC power is too high.
Public/Granted literature
- US20110057568A1 Light Adjustment Circuit For Alternating-Current Light Emitting Diodes (AC-LED's) Public/Granted day:2011-03-10
Information query
IPC分类:
