H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 37/00 (2006.01) H05B 37/02 (2006.01) H05B 39/04 (2006.01)
Patent
CA 2528404
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.
Ballenger Matthew B.
Weyhrauch Ernest C.
Fetherstonhaugh & Co.
Osram Sylvania Inc.
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