Invention Grant
- Patent Title: High efficiency AC LED driver circuit
- Patent Title (中): 高效率交流LED驱动电路
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Application No.: US11786907Application Date: 2007-04-13
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Publication No.: US07791285B2Publication Date: 2010-09-07
- Inventor: Yifeng Wu
- Applicant: Yifeng Wu
- Applicant Address: US NC Durham
- Assignee: Cree, Inc.
- Current Assignee: Cree, Inc.
- Current Assignee Address: US NC Durham
- Agency: Koppel Patrick, Heybl & Dawson
- Main IPC: H05B37/00
- IPC: H05B37/00

Abstract:
In an AC drive circuit for LEDs, a current limiting capacitor connects to an AC source, a first circuit portion, including a first rectifying diode and a first power capacitor, connects between the current limiting capacitor and the source and a second circuit portion, including a second rectifying diode in series with a second power capacitor, is in parallel with the first circuit portion. A first LED is in the first circuit portion in parallel with the first power capacitor, while a second LED in the second circuit portion is in parallel with the second power capacitor. During positive half cycles, the first rectifying diode charges the first power capacitor and drives the first LED. During negative half cycles, the second rectifying diode charges the second power capacitor and drives the second LED.
Public/Granted literature
- US20080252229A1 High efficiency AC LED driver circuit Public/Granted day:2008-10-16
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