Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1986-05-30
1988-05-17
Hix, L. T.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361 3, 323235, H02H 700, H01H 4728, G05F 110
Patent
active
047455152
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.
REFERENCES:
patent: 4275464 (1981-06-01), Schmidt
patent: 4306263 (1981-12-01), Gray et al.
patent: 4356525 (1982-10-01), Kornrumpf et al.
patent: 4568927 (1986-02-01), Fowler
patent: 4670810 (1987-06-01), Valeur
Hix L. T,.
Porterfield David
Robertshaw Controls Company
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