Invention Grant
US09035567B2 Light-emitting diode driving device for reducing light off period
有权
用于减少光照时间的发光二极管驱动装置
- Patent Title: Light-emitting diode driving device for reducing light off period
- Patent Title (中): 用于减少光照时间的发光二极管驱动装置
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Application No.: US13478115Application Date: 2012-05-23
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Publication No.: US09035567B2Publication Date: 2015-05-19
- Inventor: Harumi Sakuragi , Wataru Ogura , Minoru Kitahara
- Applicant: Harumi Sakuragi , Wataru Ogura , Minoru Kitahara
- Applicant Address: JP Anan-shi
- Assignee: NICHIA CORPORATION
- Current Assignee: NICHIA CORPORATION
- Current Assignee Address: JP Anan-shi
- Agency: Mori & Ward, LLP
- Priority: JP2011-116390 20110524
- Main IPC: H05B37/02
- IPC: H05B37/02 ; H05B33/08

Abstract:
An LED driving apparatus is provided. The apparatus includes an LED Portion 10, a charging/discharging capacitor 111, a capacitor charging and discharging paths, and a capacitor charging constant current portion 110. The LED driving portion 3 controls a current in the LED portion 10. The capacitor 111 is connected in parallel to the LED portion 10. The charging and discharging paths are connected to the capacitor whereby charging and discharging the capacitor, respectively. The constant current portion 110 is connected on the charging path and controls a charging current so that the capacitor is charged at a constant current. When rectified voltage applied to the LED portion becomes high, the capacitor is charged with the charging current through the charging path. When the voltage becomes low, the capacitor is discharged at a discharging current through the discharging path so that the discharging current is applied to the LED portion.
Public/Granted literature
- US20120299489A1 LIGHT-EMITTING DIODE DRIVING DEVICE FOR REDUCING LIGHT OFF PERIOD Public/Granted day:2012-11-29
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