Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Plural circuit elements
Reexamination Certificate
2007-01-30
2007-01-30
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Plural circuit elements
C315S072000, C315S20000A, C315S246000, C315S291000, C315S2090SC, C315S360000
Reexamination Certificate
active
11153269
ABSTRACT:
A lamp includes a voltage controller that converts a line voltage to a desired RMS load voltage. The voltage controller is entirely within a lamp base and uses pulse width modulation to define the RMS load voltage. The voltage controller has a feed-back circuit that adjusts the RMS load voltage to a desired voltage based on a comparison to a preset reference. The voltage converter also includes a switching transistor that pulse width modulates lamp current and that is responsive to the feed-back circuit. The feed-back circuit may be included in a microcontroller that has a time-based signal source that triggers the transistor, a comparator that compares the load voltage to a reference, and a program that adjusts the time-based signal source based on the comparison so as to provide the desired RMS load voltage.
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Ballenger Matthew B.
Kendrick George B.
Weyhrauch Ernest C.
Bessone Carlo S.
Osram Sylvania Inc.
Tran Thuy Vinh
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