A.c. power control for d.c. solenoid actuators

Details A.c. power control for d.c. solenoid actuators A.c. power control for d.c. solenoid actuators

H - Electricity

01

F

318/1

H01F 7/18 (2006.01) H01H 47/32 (2006.01) H01H 47/22 (2006.01)

Patent

CA 1248579

APPLICATION OF ANTHONY D'ONOFRIO A.C. POWER CONTROL FOR D.C. SOLENOID ACTUATORS ABSTRACT An A.C. power control circuit for a D.C. solenoid actuator which may be used for a solenoid operated valve uses a triac circuit to initially apply A.C. line voltage to energize the solenoid coil of the valve to be actuated to provide valve pull-in power. A capacitor in an RC network is concurrently charged to a D.C. level, and the D.C. voltage on the capacitor is used to control the gate of the triac. After a predetermined delay as determined by the RC network charging time of the capacitor, the triac is phase controlled to produce a change in the current applied to the solenoid coil. In one embodiment, the voltage applied to the solenoid coil changes at this time from the full sine wave voltage of the A.C. source to a voltage pulse which is only a portion of the positive half of the input sine wave. This voltage produces a change in the power applied to the solenoid coil to a hold-in power level. This circuit produces a current pulse phase control - 2 - of up to 90°. In a second embodiment, a phase control of up to 180° can be achieved by using a full wave bridge circuit for rectifying the A.C. to supply D.C. power to a timing circuit operating in the base circuit of a transistor controlling the energization of a photo triac. The output of the photo-triac is, in turn, used to control the "on" time of the power triac supplying the current to the solenoid coil.

518463

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