Piezoelectrically actuated variable capacitor

Details Piezoelectrically actuated variable capacitor Piezoelectrically actuated variable capacitor

1990-06-07

1991-12-24

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315227R, 361277, 361290, H05B 4124

Patent

active

050756001

ABSTRACT:
A variable capacitor includes a fixed conductive plate and a movable conductive plate with a dielectric disposed between them. A piezoelectric actuator is used to vary the distance between the conductive plates by moving the movable plate with respect to the fixed plate, with capacitance changing in inverse proportion to distance moved. In an electrodeless high intensity discharge lamp ballast, such a variable capacitor is situated in series with the excitation coil of the lamp. When a control voltage is applied to the piezoelectric actuator, the movable plate is moved from a starting position to a running position so as to maintain the ballast load in tune under both starting and running conditions, respectively, resulting in higher efficiency operation.

REFERENCES:
patent: 2588513 (1952-03-01), Giacoletto
patent: 3646413 (1972-02-01), Oomen
patent: 4312025 (1982-01-01), Boyer
patent: 4390813 (1983-06-01), Stanley
patent: 4716331 (1987-12-01), Higgins, Jr.
patent: 4783615 (1988-11-01), Dakin
patent: 4810938 (1989-03-01), Johnson et al.
patent: 4812702 (1989-03-01), Anderson
patent: 4894589 (1990-01-01), Borowiec
patent: 4894590 (1990-01-01), Witting
patent: 4902937 (1990-02-01), Witting
patent: 4910439 (1990-03-01), El-Hamamsy et al.

Affiliated with

Also associated with

Rating

Piezoelectrically actuated variable capacitor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Piezoelectrically actuated variable capacitor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piezoelectrically actuated variable capacitor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-45566