Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Plural circuit elements
Reexamination Certificate
2007-09-25
2007-09-25
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Plural circuit elements
C315S072000, C315S2090SC, C315S246000, C315S291000, C315S360000
Reexamination Certificate
active
11051840
ABSTRACT:
A lamp has a voltage controller that converts a line voltage to an RMS load voltage suitable for operation of the lamp's light emitting element, where the voltage controller is entirely within a lamp base and uses pulse width modulation to define the RMS load voltage. The voltage controller is connected in series between the light emitting element and a line voltage terminal in the lamp base and has a bridge that supplies the RMS load voltage to the light emitting element, a switching transistor that pulse width modulates a current supplied to the bridge, and a timer that is connected to a gate of the switching transistor to turn the switching transistor on and off at a rate that defines the RMS load voltage. The voltage controller allows the lamp to be used with an external dimming circuit that provides a clipped line voltage to the lamp.
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Ballenger Matthew B.
Weyhrauch Ernest C.
Bessone Carlo S.
Osram Sylvania Inc.
Tran Thuy Vinh
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