Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1995-07-13
1998-06-30
Fleming, Fritz
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361160, H01H 4722
Patent
active
057743223
ABSTRACT:
A power supply circuit is provided for use in combination with a load and an alternating current (AC) power source for selectively connecting and disconnecting the load and the AC power source. The load is connected between a neutral conductor of the AC power source and the power supply circuit. The power supply circuit is connected to a power or hot line conductor and a ground conductor of the AC power source. The power supply circuit comprises relay connected in series between the load and the line conductor; a control circuit for selectively operating the relay; and a transformer. The primary winding of the transformer is connected in series with the line conductor and the ground conductor for supplying power to the control circuit even when the load is disconnected from the AC power source. The power supply circuit comprises a switch in series with the primary winding of the potential transformer for interrupting the primary winding current at frequencies above the AC line frequency. The power supply circuit can also comprise a slide or air gap switch to isolate the power supply circuit from the AC power source when the air gap switch is in the OFF position or to limit current to an acceptable level. The air gap switch can be configured to pulse the primary winding current above the accepted level.
REFERENCES:
patent: 4340826 (1982-07-01), Muchnick
patent: 4414653 (1983-11-01), Pettinger
patent: 4617501 (1986-10-01), Smith
patent: 4713598 (1987-12-01), Smith
patent: 5223795 (1993-06-01), Blades
Product Brochure For Hubbell H. Moss Passive Infrared Wall Switch Sensor Models 1500A & 750A, 1993.
Batko Thomas James
Eckel David Philip
Walter Mark Richard
'Hubbell Incorporated
Fleming Fritz
Longanecker Stacey J.
Presson Jerry M.
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