Current control device

Electrical transmission or interconnection systems – Switching systems – Condition responsive

Patent

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Details

307118, 307140, 307157, 307246, 315209R, 315360, H01H 3500, H01H 954, H05B 3702

Patent

active

043693776

ABSTRACT:
A current control device for connection in series with an AC load where it is not convenient to make connections in parallel with the load. The device comprises a pair of terminals for connection in series with an AC load, a triac for controlling the flow of current through the load, and a control circuit for controlling the triac. A circuit for supplying current to power supply rails when current is flowing through the load comprises a transformer having a primary winding connected in series with the terminals, and a secondary winding connected across the input of a rectifier, the output of which is connected across the supply rails. A circuit for supplying power to the rails when the flow of current through the load is prevented comprises a resistor bridged by a capacitor connected in series with a zener diode between the terminals, a rectifying diode and a smoothing capacitor.

REFERENCES:
patent: 3459961 (1969-08-01), Rareas
patent: 3940660 (1976-02-01), Edwards

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