Electronic sensor on/off switch

Details Electronic sensor on/off switch Electronic sensor on/off switch

1980-05-21

1982-06-08

Zazworsky, John

Electricity: power supply or regulation systems

Output level responsive

Zero switching

307252B, 307252UA, G05F 145, H03K 1772

Patent

active

043341837

ABSTRACT:
Electronic sensor on/off switch for a load connected to an a-c supply network, including a controlled semiconductor switch connected in a series circuit with the load, a sensor for switching the load on and off, a control circuit connected from the sensor to the switch, the switch being addressable by the control circuit in a conducting state with the load switched on by a signal holding the switch in the conducting state at the zero crossing of a current passing through the load, and in a non-conducting state with the load disconnected by signal switching the switch into the conducting state for switching on the load at the zero crossing of an output a-c voltage at the switch, a power supply circuit connected to the control circuit, a current transformer having a primary and a secondary winding and being operable in saturation, the current transformer being connected in series with the switch, the control circuit including a first rectifier being coupled to the secondary winding and having an output producing a supply voltage with the switch in the conducting state relative to a reference potential equal to a reference potential point of the output a-c voltage, and a branch of the series circuit including the primary winding, the switch, a storage capacitor chargeable by the output a-c voltage and a second rectifier producing the supply voltage in the non-conducting state.

REFERENCES:
patent: 3633095 (1972-01-01), Hood
patent: 4050008 (1977-09-01), Glaser et al.
patent: 4087697 (1978-05-01), Johnson
patent: 4218648 (1980-08-01), Sansum

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