H - Electricity – 02 – M
Patent
H - Electricity
02
M
323/13
H02M 5/04 (2006.01) H02M 5/257 (2006.01)
Patent
CA 1129496
POWER SUPPLY AND CONTROL CIRCUIT FOR SERIES CONNECTED CONTROLLER Abstract of Disclosure A control circuit for a power threshold switch, like a power 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 a rectifier connected in series with an energy storage means, such as a capacitor, the terminals of which constitute the DC ouptut terminal of the DC power supply, an impedance of much greater resistance than that of the load device and through which the cap- acitor is charged when the triac is in its non-conductive mode, and preferably a low power control triac shunting the high imped- ance and triggered momentarily into conduction each half cycle as the applied AC voltage goes through zero when the power triac is to be in its conductive mode, to effect charging of said energy storage means and subsequently the triggering of said power thres- hold switch into conduction.
345091
Dynascan Corporation
Macrae & Co.
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