Electromagnetic drive circuit

Details Electromagnetic drive circuit Electromagnetic drive circuit

1988-03-04

1989-09-19

Hix, E. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

368166, 368181, 361159, H01H 4712, G04C 302

Patent

active

048687090

ABSTRACT:
An electromagnetic drive circuit comprises a coil for detecting and driving a permanent magnet; a comparator for generating an output when the induced voltage of the coil exceeds a reference voltage; a pulse generator for generating a drive pulse train in response to generation of the output of the comparator; a driver responsive to the drive pulse train for feeding a drive current to the coil; and a controller responsive to interruption of the output of the comparator for interrupting generation of the drive pulse train of the pulse generator. The permanent magnet is detected and driven by the single coil so that the output may be generated by the comparator when the induced voltage of the coil exceeds the reference value, and the drive pulse train is generated during generation of that output to feed the drive current to the coil. The coil can always be efficiently driven at the maximal point of the induced voltage, and the permanent magnet can be driven with a stable amplitude. The amplitude can be easily adjusted merely by changing the reference voltage.

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

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