G - Physics – 05 – D
Patent
G - Physics
05
D
342/38
G05D 7/06 (2006.01) H01F 7/18 (2006.01)
Patent
CA 1047627
Abstract of the Disclosure 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 pair of diodes and a pair of silicon controlled recti- fiers connected in a bridge circuit to supply its sole- noid. The common timing and triggering circuit is con- nected 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.
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