Electrical transmission or interconnection systems – Switching systems – Switch actuation
Patent
1979-07-25
1981-05-26
Hartary, Joseph W.
Electrical transmission or interconnection systems
Switching systems
Switch actuation
307252B, 307252N, 315360, H05B 3702
Patent
active
042700582
ABSTRACT:
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 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-conductive mode, and preferably a low power control triac shunting the high impedance 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 threshold switch into conduction.
REFERENCES:
patent: 3491249 (1970-01-01), Rabinow
patent: 3940660 (1976-02-01), Edwards
Dwyer James L.
Hartary Joseph W.
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