Lamp including phase-control power controller with digital...

Details Lamp including phase-control power controller with digital... Lamp including phase-control power controller with digital...

2007-05-01

2007-05-01

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S308000, C315S2090SC, C315SDIG002, C315S224000

Reexamination Certificate

active

11051574

ABSTRACT:
A phase-control power controller that converts a line voltage to an RMS load voltage includes a phase-control circuit with a potentiometer and a capacitor whose resistance and capacitance determine clipping of a load voltage, a load sensing circuit that senses the load voltage and provides a DC signal that is different from but related to the RMS load voltage, and a comparator circuit that compares the DC signal to a reference and adjusts the resistance of the potentiometer to control the RMS load voltage. The power controller may be in a voltage conversion circuit that converts a line voltage at a lamp terminal to the RMS load voltage usable by a light emitting element of a lamp.

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patent: 6445133 (2002-09-01), Lin et al.
patent: 7030567 (2006-04-01), Ballenger et al.

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