Electromagnetic drive circuit

Details Electromagnetic drive circuit Electromagnetic drive circuit

1988-03-04

1989-09-12

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

368166, 368181, 361159, H01H 4712, G04C 302

Patent

active

048665649

ABSTRACT:
Herein disclosed is an electromagnetic drive circuit for driving a pendulum or the like, comprising: a coil for detecting and driving a permanent magnet; a reference voltage source having a variable reference voltage; a comparator for generating an output when the induced voltage of the coil exceeds the reference voltage; a pulse generator for generating a drive pulse in response to generation of the output of the comparator; a driver responsive to the drive pulse for feeding a drive current to the coil; and a controller responsive to the output of the comparator for controlling the reference voltage in accordance with the amplitude of the induced voltage. It is possible to integrate the most of construction and to eliminate the disadvantage of generating the drive pulses at the level of the induced voltage other than its maximal point so that the automatic control can be accomplished to effect the drive efficiently at the maximal point of the induced voltage at all times. Thus, the permanent magnet can be driven efficiently with the stable amplitude.

REFERENCES:
patent: 4196579 (1980-04-01), Schaefer

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