Electric lamp and discharge devices: systems – Current and/or voltage regulation – Plural regulators
Reexamination Certificate
2008-12-22
2011-10-11
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Plural regulators
C315S308000, C315S312000, C315S360000, C345S204000
Reexamination Certificate
active
08035315
ABSTRACT:
Power management in a light emitting diode (LED) system having a plurality of LED strings is disclosed. A voltage source provides an output voltage to drive a plurality of LED strings. An LED driver implements a feedback mechanism to monitor the tail voltages of the active LED strings to identify the minimum tail voltage and adjust the output voltage of the voltage source based on the lowest tail voltage. A loop calibration module of the LED driver calibrates the feedback mechanism of the LED driver based on a relationship between a digital code value used to generate a particular output voltage and another digital code value generated based on the minimum tail voltage resulting from the particular output voltage.
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Cornish Jack W.
Horng Brian B.
Kameya Andrew M.
Krellner Jan
Kwok Kenneth C.
Freescale Semiconductor Inc.
Tran Thuy Vinh
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