Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1988-07-06
1990-03-06
Shoop, Jr., William M.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361153, 3611681, 307132R, H01H 4700
Patent
active
049071220
ABSTRACT:
In a relay circuit, a stationary contact of a relay is coupled to a DC voltage source and a moving contact of the relay is coupled to a load circuit. The moving contact is switched to the stationary contact in response to a rapidly rising edge of a DC voltage applied to the relay. A voltage sensor is connected to the moving contact for detecting a voltage which appears thereat. For operating the relay, a switch is closed to apply a voltage from the DC voltage source to a pulse generator. The pulse generator generates a rectangular pulse and applies it to the relay to cause it to switch the moving contact to the stationary contact. If a voltage is not detected by the voltage sensor at the moving contact after energization of the relay, the pulse generator reapplies a rectangular pulse to the relay until a voltage appears at the moving contact, whereupon the pulse generator applies a constant voltage to the relay.
REFERENCES:
patent: 3965398 (1976-06-01), Miller
patent: 4710645 (1987-12-01), Doittau et al.
patent: 4714976 (1987-12-01), Pin et al.
NEC Corporation
Shoop Jr. William M.
Williams H. L.
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