Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1980-09-04
1982-09-14
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361203, G08B 1326
Patent
active
043498582
ABSTRACT:
A control circuit for use with an electronic guard strip for preventing collision of the strip with a moving object. A control such as a relay, is connected to at least one antenna, which antenna forms a capacitor together with a base in its ambiance. A voltage generator conducts an alternating voltage to the antenna. The control and the antenna are connected in circuit relation to an amplifier. A change of voltage arising from any capacitive protuberation in the antenna is conducted to the control. The voltage from the amplifier is conducted through a rectifier to another amplifier that is connected so as to have its direct current gain as +1, but which amplifies any change of voltage occurring in the d.c. voltage input to a multiple and which further acts upon the control through a comparator.
REFERENCES:
patent: 3496381 (1970-02-01), Wisnia
patent: 4168495 (1979-09-01), Sweeney
Suur-Askola Seppo
Torenius Pekka
Elevator GmbH
Moose Jr. Harry E.
Smolowitz Martin
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