Phase-control power controller with digital RMS load voltage regulation
AssigneeOsram Sylvania Inc.
InventorsMatthew B. Ballenger, George B. Kendrick
Life of this patent
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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.
Claims7
A phase-control power controller that converts a line voltage to an RMS load voltage, the controller comprising:
- line terminals for a line voltage and load terminals for a load voltage;
- a phase-control circuit connected to said line and load terminals and having a potentiometer and a capacitor that clip the load voltage;
- a load sensing circuit connected across said load terminals that senses the load voltage and provides a DC signal that is related to an RMS load voltage;
- and
- a comparator circuit connected to said phase-control circuit and said load sensing circuit and that compares the DC signal to a reference and adjusts a resistance of said potentiometer in response to the comparison to control the RMS load voltage.
Dependencies are inferred from the claim text.