Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1988-12-08
1990-05-29
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
323909, 73717, 34082516, 34087016, H02H 500
Patent
active
049300415
ABSTRACT:
A potentiometer position switch circuit which includes a meter mechanism having a low friction potentiometer coupled to move therewith. The output of the low friction potentiometer is coupled together with the output of a set point potentiometer across the input terminals of a comparator. A magnetic latching double pole, double throw relay having set and reset relay coils is connected to the output of the comparator through the gate of a first voltage operated transistor and through sufficient resistance to minimize current drain and also through an invertor to the gate of a second voltage operated transistor and through a second resistor of sufficient resistance to minimize current drain. The output of the first voltage operated transistor is connected from a second voltage source through the set relay coil to ground and the output of the second voltage operated transistor is connected from a voltage source through said reset relay coil to ground. One set of contacts on the relay are connected to ground the gate on said second transistor when the voltage on the gate of the first transistor is high and to ground the gate on the first transistor when the gate on the second transistor goes high. The other set of contacts are connected to actuate a utilization circuit in one or the other position.
REFERENCES:
patent: 2967504 (1976-07-01), Akeley
patent: 4271701 (1981-06-01), Dempster et al.
patent: 4631626 (1986-12-01), Bohan, Jr.
patent: 4798089 (1989-01-01), Frick et al.
Elderton Peter P.
Granada Richard P.
Howes Royal E.
Gaffin Jeffrey A.
ITT Corporation
Lombardi Menotti J.
Pellinen A. D.
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