Invention Grant
US08421371B2 LED drive circuit, LED illumination fixture, LED illumination device, and LED illumination system
失效
LED驱动电路，LED照明灯具，LED照明装置和LED照明系统
- Patent Title: LED drive circuit, LED illumination fixture, LED illumination device, and LED illumination system
- Patent Title (中): LED驱动电路，LED照明灯具，LED照明装置和LED照明系统
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Application No.: US12987193Application Date: 2011-01-10
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Publication No.: US08421371B2Publication Date: 2013-04-16
- Inventor: Takayuki Shimizu , Hirohisa Warita , Atsushi Kanamori , Mitsuru Mariyama
- Applicant: Takayuki Shimizu , Hirohisa Warita , Atsushi Kanamori , Mitsuru Mariyama
- Applicant Address: JP Osaka
- Assignee: Sharp Kabushiki Kaisha
- Current Assignee: Sharp Kabushiki Kaisha
- Current Assignee Address: JP Osaka
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2010-065876 20100323
- Main IPC: G05F1/00
- IPC: G05F1/00
Abstract:
An LED drive circuit in which an alternating voltage is input and an LED is driven, and which can be connected to a phase control dimmer The LED drive circuit is provided with an edge detector for detecting an edge of the output voltage of the phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to the LED; wherein the value of the current extracted from the current feed line by the current extractor is varied in accordance with the detection results of the edge detector.
Public/Granted literature
- US20110234115A1 LED DRIVE CIRCUIT, LED ILLUMINATION FIXTURE, LED ILLUMINATION DEVICE, AND LED ILLUMINATION SYSTEM Public/Granted day:2011-09-29
Information query
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