Optically coupled input circuit for digital control

Details Optically coupled input circuit for digital control Optically coupled input circuit for digital control

1982-09-29

1985-03-26

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307261, 307311, 307350, 307360, 307475, 307257, 307318, 307321, 328 2, 363126, H03K 520, H03K 508

Patent

active

045075719

ABSTRACT:
An a.c. input circuit for converting a sensed a.c. voltage into a logic level voltage includes a rectifier for converting the sensed a.c. voltage to a d.c. voltage which is supplied through a coupling impedance to the light emitter of an optical isolator. While the a.c. input voltage is below a first predetermined voltage, a switchable low impedance circuit path in parallel with the light emitter is rendered conductive to maintain a low impedance across the light emitter to prevent the light emitter from becoming conductive. A switchable high impedance circuit path in parallel with the switchable low impedance circuit path becomes conductive once the sensed a.c. input voltage reaches the predetermined voltage to drive the light emitter into hard conduction. The switchable high impedance circuit path remains conductive until the sensed a.c. input voltage drops below a second predetermined value, at which point the light emitter is turned off and the switchable low impedance path becomes conductive.

REFERENCES:
patent: 3691403 (1972-09-01), Newmeyer
patent: 3992636 (1976-11-01), Kiffmeyer
patent: 4079272 (1978-03-01), Howatt
patent: 4086503 (1978-04-01), Fox
patent: 4275307 (1981-06-01), Struger et al.
Tony Bishop, Relays: Solid State I/O Converter Modules Feature Optically Isolated Inputs, May 1976, Canadian Electronics Engineering.
Allen Bradley Part No. 634,760, "AC/DC Input Module".

Affiliated with

Also associated with

Rating

Optically coupled input circuit for digital control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optically coupled input circuit for digital control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optically coupled input circuit for digital control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1295957