Electric lamp and discharge devices: systems – Current and/or voltage regulation – Plural regulators
Reexamination Certificate
2008-03-26
2010-11-02
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Plural regulators
C315S18500S, C315S308000, C315S312000, C315S360000
Reexamination Certificate
active
07825610
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 the LED strings. An LED driver monitors the tail voltages of the active LED strings to identify the minimum, or lowest, tail voltage and adjusts the output voltage of the voltage source based on the lowest tail voltage. The LED driver can adjust the output voltage so as to maintain the lowest tail voltage at or near a predetermined threshold voltage so as to ensure that the output voltage is sufficient to properly drive each active LED string with a regulated current in view of pulse width modulation (PWM) performance requirements without excessive power consumption.
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Cornish Jack W.
Horng Brian B.
Kameya Andrew M.
Lee Victor K.
Zhao Bin
Freescale Semiconductor Inc.
Tran Thuy Vinh
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