Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2011-01-11
2011-01-11
Owens, Douglas W (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S299000, C315S307000, C315S032000
Reexamination Certificate
active
07868563
ABSTRACT:
A light emitting device drive circuit includes: a power conversion unit for receiving an input electric power and performing an electric power conversion on the input electric power in accordance with a control signal so as to generate the predetermined output current; a current detection unit for detecting an output current IL of the power conversion unit; a temperature detection unit for detecting a case internal temperature TD, which is an interior temperature of a case for accommodating the light emitting device drive circuit; a regulation unit being operable to a) detect whether a temperature TL of the light emitting device has reached a first predetermined temperature TLmax based on TD, IL, and a temperature rise coefficient α relative to IL, the temperature rise coefficient α being set in advance so that TL satisfies a relationship of TL=TD+α·IL, and b) generate a regulation signal for reducing a predetermined output current IL0so that TL does not exceed TLmax in the event that a result of the detection indicates that TL has reached TLmax; and a control unit for controlling IL0in accordance with the regulation signal from the regulation unit.
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Ito Masayasu
Namba Takanori
Uchiyama Yoshihiro
Chen Jianzi
Koito Manufacturing Co. Ltd.
Osha & Liang LLP
Owens Douglas W
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