Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1975-10-02
1977-05-03
Moose, Harry
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361159, 361197, H01A 4700
Patent
active
040217060
ABSTRACT:
A solid state switching circuit for applying rectified alternating current to one or the other of two solenoid valve actuators and modulating that current from a pull-in value to a lower holding value has a separate power circuit for each solenoid and a common timing and trigger circuit. Each power circuit contains a pair of diodes and a pair of silicon controlled rectifiers connected in a bridge circuit to supply its solenoid. The common timing and triggering circuit is connected to be energized whenever either power circuit is energized and contains a first DIAC control circuit for supplying triggering pulses early in each AC cycle and a second DIAC circuit for supplying pulses late in each AC cycle. The DIACs feed a coupling transformer which is coupled to the silicon controlled rectifiers of both power circuits. A time delay circuit biases a transistor to the on state after a predetermined time interval to disable the first DIAC control circuit.
REFERENCES:
patent: 3495154 (1970-02-01), Dosch et al.
patent: 3558995 (1971-01-01), Swinehart
patent: 3577040 (1971-05-01), Campbell
patent: 3766432 (1973-10-01), Markowitz et al.
Moose Harry
Sperry Rand Corporation
Van Meter Theodore
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