G - Physics – 05 – F
Patent
G - Physics
05
F
323/13
G05F 1/44 (2006.01) G05F 1/46 (2006.01) H02M 5/257 (2006.01) H05B 37/02 (2006.01)
Patent
CA 1136215
POWER SUPPLY AND CONTROL CIRCUIT FOR SERIES CONNECTED CONTROLLER Abstract of Disclosure A control circuit for a power switch like a triac to be connected in series with a load device, at a situs where only one AC power conductor and a conductor extending to the load device is available, is energized from a DC power supply energized from these conductors. The power supply includes at least one rectifier con- nected in series with a capacitor, the terminals of which consti- tute the DC output terminal of the DC power supply, an impedance of much greater resistance than that of the load device and through which the capacitor is charged when the triac is in its non-con- ductive mode, and a normally non-conductive triggerable low imped- ance threshold device shunting the high impedance and triggered momentarily into conduction as the applied AC voltage goes through zero when the triac is to be in its conductive mode. Current flow through this threshold device triggers the power switch into con- duction a short interval after passage of this voltage through zero. The capacitor charges only during each such short interval it takes to initiate. conduction of the power switch.
345096
Dynascan Corporation
Macrae & Co.
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