Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Load device and impedance
Patent
1994-03-04
1996-04-02
Lee, Benny T.
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Load device and impedance
315307, 315 72, 315 73, 323908, 323238, 307157, H05B 3904
Patent
active
055043950
ABSTRACT:
An incandescent lamp bulb which is driven by an electronic control module (ECM) and method of manufacture characterized in that an inductor comprising a magnetic element and a winding thereon is disposed within a screw shell base of the lamp bulb and surrounds the lamp exhaust tube therein. One end of the winding on the magnetic element is connected to a filament wire within the screw shell base and the other end of the inductive winding is connected to an output terminal of the ECM control module. In this manner, the inductor significantly reduces the di/dt rise time of voltage and current when a triac within the ECM module is driven to conduction on each one half cycle of the applied AC line voltage. This operation in turn produces a substantial reduction in radio frequency interference, both of radiation transmitted into space from the lamp bulb and by direct DC coupling back into the AC line voltage source. In a preferred embodiment, the di/dt rise time is calculated mathematically based on a Fourier series transformation of the current conducted through the filament by the triac.
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Hung Chih-Ju
Johnson Samuel A.
Lau Veng-Chong
Roblin Patrick
Beacon Light Products, Inc.
Kinkead Arnold
Lee Benny T.
Ley John R.
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