Electromagnetic coil drive device

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...

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361187, H01H 4704

Patent

active

048781479

ABSTRACT:
In an electromagnetic coil drive device an operation coil excites an electromagnet. A switching element is turned on and off by application of a pulse signal thereto and supplies the operation coil with a power supply voltage. A voltage detecting circuit detects the power supply voltage and a gain circuit delivers a closing level signal in accordance with the voltage detected by the voltage detecting circuit. The gain circuit also delivers a holding level signal based on the detected voltage after a predetermined period of time. The level of the holding level signal is higher than that of the closing level signal. A reference wave generating circuit generates a triangular wave. A comparing circuit compares the triangular wave with the closing level signal to thereby generate a closing pulse signal having a predetermined cycle. The comparing circuit also compares the triangular wave with the holding level signal after the predetermined period of time to thereby generate a holding pulse signal having a duty ratio smaller than that of the closing pulse signal. An on-off drive circuit supplies the switching element with the closing and holding pulse signals.

REFERENCES:
patent: 4071877 (1978-01-01), Stewart et al.
patent: 4516185 (1985-05-01), Culligan et al.
patent: 4633362 (1986-12-01), Saunders
patent: 4636912 (1987-01-01), Ohtani
patent: 4641219 (1987-02-01), Aiba
patent: 4649458 (1987-03-01), Arai et al.
patent: 4679116 (1987-07-01), Oshizawa et al.
patent: 4812945 (1989-03-01), D'Onofrio

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