Motor start-up circuit with a triac and PTC thermistors

Details Motor start-up circuit with a triac and PTC thermistors Motor start-up circuit with a triac and PTC thermistors

1997-04-01

1999-04-27

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

H02P 142

Patent

active

058982892

ABSTRACT:
A motor start-up circuit is incorporated in a motor-driving circuit provided with an auxiliary coil which operates during a start-up time of the motor and a main coil for a steady-state operation of the motor. The start-up circuit in one form has a start-up thermistor with positive temperature characteristic and a Triac switch connected in series with the auxiliary coil and a triac-controlling thermistor with positive temperature characteristic connected in parallel to the start-up thermistor, and one of the terminals of the triac-controlling thermistor is connected to the gate of the Triac switch. The start-up circuit in another form has a Triac switch connected in series with the auxiliary coil and a triac-controlling thermistor with positive temperature characteristic connected in parallel to the auxiliary coil and the Triac switch and one of the terminals of the triac-controlling thermistor is connected to the gate of the Triac switch. In both forms, the triac-controlling thermistor has resistance 300-3000 .OMEGA. at 25.degree. C. and volume of 30-60 mm.sup.3 and doubles its value of resistance at 25.degree. C. at 70-125.degree. C.

REFERENCES:
patent: 3544869 (1970-12-01), Plouffe et al.
patent: 3562587 (1971-02-01), Forst
patent: 3683250 (1972-08-01), Fricker
patent: 3965392 (1976-06-01), Moorhead et al.
patent: 4161681 (1979-07-01), Rathje
patent: 4267635 (1981-05-01), Blaha
patent: 4430681 (1984-02-01), Benzing
patent: 5345126 (1994-09-01), Bunch
patent: 5391971 (1995-02-01), Yamada et al.
patent: 5451853 (1995-09-01), Itoh

Affiliated with

Also associated with

Rating

Motor start-up circuit with a triac and PTC thermistors does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Motor start-up circuit with a triac and PTC thermistors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor start-up circuit with a triac and PTC thermistors will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-687627