AC contactless switch

Details AC contactless switch AC contactless switch

1987-02-06

1988-07-12

Zazworsky, John

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307638, 307308, 328 5, H03K 1772, H03K 1708

Patent

active

047573414

ABSTRACT:
A contactless switch for controlling a thyristor switching element by means of a sensor circuit includes a bridge rectifier across whose input terminals are connected in series on AC power supply and a load and across whose output terminals are connected the thyristor. The switch includes a constant-voltage circuit which charges a capacitor whose charge controls the state of the thyristor. The constant-voltage circuit is controlled by a disabling circuit which is controlled by the output of the sensor circuit. There is included a timing circuit supplied by the output of a current detection circuit which measures the charging current and is able to suspend the functioning of the disabling circuit for a prescribed period of time.

REFERENCES:
patent: 3743861 (1973-07-01), Bolmgren
patent: 3839651 (1974-10-01), Michaels
patent: 4199694 (1980-04-01), Van Zeeland
patent: 4667144 (1987-05-01), Wiesgickl
Simple Liquid Gauge with the Integrated Proximity Switch TCA 205, Siemens Components XVI (1981), No. 5, pp. 175-177.

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