Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device
Reexamination Certificate
2011-03-01
2011-03-01
Vo, Tuyet Thi (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
With power factor control device
C315S18500S, C315S224000, C315S307000, C315S312000
Reexamination Certificate
active
07898187
ABSTRACT:
A regulator regulates one or more light emitting diodes (LEDs) so as to control an average current through the LEDs. The regulator could include a transistor switch that can couple the LEDs to ground. The regulator could also include circuitry that controls the transistor switch. The circuitry could use a substantially constant reference voltage to regulate the average current through the one or more LEDs. The transistor switch could couple the one or more LEDs to ground through a resistor, and the circuitry could include an error amplifier that compares the reference voltage to a voltage across the resistor. The circuitry could also include a gate driver that can drive a gate of the transistor switch. The error amplifier could be disabled for a period of time when the transistor switch is non-conductive, and the circuitry could include logic for enabling and disabling the error amplifier.
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Mei Tawen
Yang Thomas
National Semiconductor Corporation
Vo Tuyet Thi
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