Digital ballast

Details Digital ballast Digital ballast

2007-12-11

2007-12-11

Chen, Shih-Chao (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Reexamination Certificate

active

11269071

ABSTRACT:
A ceiling fan including a lamp ballast in which the drive current frequency is controlled by a voltage-controlled oscillator (VCO) that is capable of precise output frequency control. The VCO frequency is controlled by a microcontroller. The microcontroller may control the VCO frequency in response to various input signals including a triac signal, a manual dimmer control signal, a remote control receiver signal, a light monitor signal, a motion detector signal, or a communication interface signal.

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patent: 6120262 (2000-09-01), McDonough et al.
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patent: 6304037 (2001-10-01), Hsieh
patent: 6461032 (2002-10-01), McKinley
patent: 2003/0090219 (2003-05-01), Kazanov et al.
patent: 2003/0225542 (2003-12-01), Liu et al.

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