Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1991-08-26
1992-12-08
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310339, 310324, 200181, H01L 4108
Patent
active
051700875
ABSTRACT:
An electronic circuit for a contactless, piezoelectric switch assembly. The piezoelectric switch assembly includes a piezoelectric module which generates voltages under manual pressure and electronic circuit operative to perform a predetermined switch function upon receipt of these electrical signals. The electronic circuit performs a variety of switching functions, such as: toggle on and off; dimmer setting; momentary on. The sensing means of the electronic circuit is coupled to the piezoelectric module via a reference voltage and a negative current source that pulls one terminal of the piezoelectric module toward the reference voltage. A slew rate limited buffer amplifier drives a comparator with hysteresis achieved by changing the comparison voltage. This hysteresis serves to reduce detection of jitter and noise in the initial application of pressure. In the momentary on mode the reference voltage supplied to the piezoelectric module is above the second threshold of the comparator when initial manual pressure is detected. This causes the comparator to remain tripped. Upon release of pressure on the piezoelectric module, a piezoelectric signal of the opposite polarity causes the comparator to reset. In order to prevent hang up, a timer returns the reference voltage to its original level after a predetermined time.
REFERENCES:
patent: 3339104 (1967-08-01), Kushner et al.
patent: 4185621 (1980-01-01), Morrow
patent: 4253095 (1981-02-01), Schwartz et al.
patent: 4379245 (1983-04-01), Goldstein
patent: 4542325 (1985-09-01), Kobayashi et al.
patent: 4706069 (1987-11-01), Tom et al.
patent: 4714846 (1987-12-01), Pesque et al.
patent: 4761582 (1988-08-01), McKee
patent: 4820953 (1989-04-01), Saubolle et al.
patent: 4853580 (1989-08-01), Sula
patent: 5034648 (1991-07-01), Gastgeb
Karr Barrett
Walker Thomas
Budd Mark O.
Touch Tec International
LandOfFree
Electronic circuit for piezoelectric switch assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electronic circuit for piezoelectric switch assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic circuit for piezoelectric switch assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-962669