Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2008-03-12
2010-12-14
Vo, Tuyet Thi (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S247000, C315S307000, C315S18500S, C315SDIG002
Reexamination Certificate
active
07852017
ABSTRACT:
A lighting source ballast utilizes switching and control technology to convert an alternating current (AC) phase modulated dimmer input voltage into an approximately constant drive current to illuminate one or more light emitting diodes (LED(s)). In at least one embodiment, the state of the drive current conforms to a phase delay of the input voltage to facilitate, for example, dimming. The phase delay of the input voltage indicates a particular dimming level. The drive current varies for different dimming levels. However, the light source ballast controls drive current so that the drive current is approximately constant for each dimming level. In at least one embodiment, the ballast emulates a resistive load and, thus, the ballast has an approximately unity power factor. The switching frequency of one or more switches can be modified to spread the spectrum of electromagnetic radiation generated by the ballast.
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Linear Technology, “Single Switch PWM Controller with Auxiliary Boost Converter,” LT1950 Datasheet, Linear Technology, Inc. Milpitas, CA, 2003.
Yu, Zhenyu, 3.3V DSP for D
Chambers Kent B.
Cirrus Logic Inc.
Hamilton & Terrile LLP
Vo Tuyet Thi
LandOfFree
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