Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2004-08-31
2008-09-16
Dinh, Trinh Vo (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S308000, C315S291000
Reexamination Certificate
active
07425803
ABSTRACT:
In a method for producing a control signal for regulating a drive current for driving an LED, a current through the LED is sensed, wherein the LED is driven by a power converter output, and wherein an output voltage of the power converter is proportionately controlled by a control signal. Next, a power supply voltage is sensed. The control signal is produced for the power converter, wherein the control signal is proportional to a difference between a reference voltage and the current through the LED. The control signal is then offset in response to the power supply voltage to reduce the current through the LED as the power supply voltage drops.
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Ortmeyer, II Clifford J.
Shao Jianwen
Dinh Trinh Vo
Duong Dieu Hien T
Jorgenson Lisa K.
Leveque Renee Michelle
STMicroelectronics Inc.
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