Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1991-11-15
1993-06-08
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361156, 361185, 361187, H01H 4732
Patent
active
052185095
ABSTRACT:
An electrically operated control device and system for an appliance and method of operating the same are provided, the system comprising a power source of alternating electrical current that has a repeating voltage wave cycle and a repeating current wave cycle, a load for using the electrical current to provide an output of the load for the appliance, a relay having normally open contacts and a coil for closing the contacts only when the coil is energized, an electrical circuit for interconnecting the power source to the load through the contacts only when the contacts are closed, and a control unit for causing the coil to close the contacts substantially at a certain point on the voltage wave cycle each time the relay coil closes the contacts from the open condition thereof whereby the current flow through the contacts at each closing thereof is at substantially a desired level thereof.
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patent: 4473862 (1984-09-01), Hill
patent: 4568927 (1986-02-01), Fowler
patent: 4670810 (1987-06-01), Valeur
patent: 4767944 (1988-08-01), Takeuchi et al.
Gaffin Jeffrey A.
Robertshaw Controls Company
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