Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2007-07-24
2007-07-24
Dinh, Trinh (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S291000, C315S307000
Reexamination Certificate
active
10969628
ABSTRACT:
A temperature profile storage unit stores a Vf-Ta table showing a relationship between a forward voltage Vf and am ambient temperature Ta of an LED element, and a Ta-Ifmax table showing a relationship between the ambient temperature Ta and a maximum tolerable current Ifmax. The forward voltage Vf of the LED element driven by a power supply is detected and fed to a feedback point determining unit. A temperature computing unit determines the ambient temperature from the detected forward voltage Vf. A driving current determining unit determines a maximum tolerable current Ifmax from the ambient temperature Ta thus determined, by referring to the Ta-Ifmax table, and supplies a command value defining a current to drive the LED element to a constant current source via a D/A converter. The constant current source adjusts the current to drive the LED element in accordance with the command value.
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Japanese Office Action for Patent Application No. 2003-361169 with English translation dated Nov. 14, 2006.
Japanese Office Action for Patent Application No. 2003-361169 with English translation dated Nov. 14, 2006.
Office Action for Application No. 2003-361169 dated Feb. 27, 2007.
Tamegai Yoichi
Yamamoto Isao
Cantor & Colburn LLP
Dinh Trinh
Le Tung
Rohm & Co., Ltd.
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