Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1990-12-13
1992-09-08
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361185, 3072471, 307268, 3075421, H01H 4700
Patent
active
051463881
ABSTRACT:
A driver circuit that is responsive to an input AC voltage provides a variable drive signal to a load circuit, such as, a solenoid coil, for each actuation of a switch where the variable drive signal duration is determined by the setting of a variable resistor. In one embodiment, a sine wave shaper produces a positive edge variably delayed square wave timing signal for a continuously clocked flip-flop. In response to the switch actuation, the clocked flip-flop generates a control signal for a selected period of time that is related to one cycle of the AC input voltage. In another embodiment, a one shot produces a positive edge variable delayed square wave timing signal in response to the switch, the signal then being received by another one shot which creates a control signal for a selected period of time that is related to one cycle of the AC input voltage. The selected period of time occurs only during the positive portion of the input AC voltage cycle. The control signal is employed to generate the drive signal for the load circuit.
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Parker Edward I.
Piucci, Jr. Vincent A.
Weiss Harold
Gaffin Jeffrey A.
The Stanley Works
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