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, H03K 1772, G05F 145

Patent

active

043341845

ABSTRACT:
Electronic sensor on/off switch for a load connected to an a-c supply network includes a controlled semiconductor switch connected in series 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 a 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 two-terminal voltage limiting network connected in a series circuit with the switch for generating an amplitude-limited a-c voltage if the switch is conducting, an inductive converter connected to the two-terminal voltage limiting network, a terminal producing a reference potential point connected to the two-terminal voltage limiting network, a storage capacitor connected to the inductive converter for producing a supply voltage for the control circuit relative to the reference potential point, a branch connected to the series circuit of the two-terminal voltage limiting network and the switch including the storage capacitor and a rectifier, and another terminal connected between the storage capacitor and the rectifier for producing the supply voltage in the non-conducting state of the switch, the storage capacitor being charged by the output a-c voltage when the switch is in the non-conducting state.

REFERENCES:
patent: 3506852 (1970-04-01), DeHart
patent: 3780318 (1973-12-01), Werts et al.
patent: 3882328 (1975-05-01), Mazgy et al.
patent: 4087697 (1978-05-01), Johnson
patent: 4218648 (1980-08-01), Sansum

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