Multi-zone lighting control system

Details Multi-zone lighting control system Multi-zone lighting control system

1999-06-16

2000-04-04

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315316, 315307, 315DIG4, H05B 3702

Patent

active

060465506

ABSTRACT:
A diagnostic apparatus for use in a light dimming circuit of the tape which selectively controls the current flow through a lighting load to adjust its luminous output. The dimming circuit has a controllably conductive device, such as a triac, connectable in series between an A.C. power source and a lighting load, and a control circuit which responds to a dimming level control signal to selectively apply a selected portion of an A.C. voltage waveform produced by the A.C. power source to the lighting load to adjust the RMS voltage across the load. The selected portion is determined by a firing angle at which the control circuit causes the controllably conductive device to conduct power during each half cycle of the A.C. waveform. The diagnostic appararus has a senior to sense the operating status of a component of the dimming circuit and/or the presence of the dimming level control signal. A logic circuit compares an output of the sensor to provide an indication of the present operating status of The component and/or the presence of the dimming level control signal. A status indicator responds to the output of the logic circuit to provide a visual indication of a change in status of the component and/or presence of the dimming control signal.

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