Patent US3969677A successfully refreshed from Google Patents.
US3969677A
Expired / Lapsed
US
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Frequency responsive polarity discriminator
Assignee: Reliance Electric Co
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Filing: 1975-05-21
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Granted: 1976-07-13
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Expires: 1995-05-21
Abstract
Abstract A sensing circuit using a polarity discriminator with feedback means for selecting one polarity component of a bi-polar non-symmetrical waveshape signal input, while rejecting the opposite polarity component. The circuit operates on both the amplitude and the frequency characteristics of the input signal, to produce an output signal responsive to these characteristics. The circuit may be used to process signals generated from toothed wheels by electromagnetic sensors, or the like, typically used in tachometer control.
Inventors
- 👤 Joseph T. Woyton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:40
CPC Classifications
G; G01; G01P; G01P13/00; G01P13/02; G01P13/04; G01P13/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A sensing circuit comprising a means for producing a bi-polar, non-symmetrical waveshape signal, a polarity discriminator connected to said means, a signal processing circuit having a positive and negative responding channel means which includes an amplifier, a monostable multivibrator connected in series, and a summing junction connected to said channel means, said circuit being connected to said processing discriminator and controlled by the frequency of said signal, and a feedback means connecting said summing junctions output to said polarity discriminator for selecting one polarity component of said signal input, while rejecting the opposite polarity component.
Claim 2
Dependent Claim
95 words
A sensing circuit comprising a means for producing a bi-polar, non-symmetrical waveshape signal, a polarity discriminator connected to said means, a signal processing circuit having a positive and negative responding channel means which includes an amplifier, a monostable multivibrator connected in series, and a summing junction connected to said channel means, said circuit being connected to said processing discriminator and controlled by the frequency of said signal, and a feedback means connecting said summing junctions output to said polarity discriminator for selecting one polarity component of said signal input, while rejecting the opposite polarity component.
Claim 3
Dependent Claim
23 words
A sensing circuit as defined in claim 1 in which said first mentioned means includes a non-symmetrical toothed wheel and a compatible sensor.
Claim 4
Dependent Claim
24 words
A sensing circuit as defined in claim 1 in which said signal processing circuit generates a DC voltage in response to said signal frequency.
Claim 5
Dependent Claim
14 words
A sensing circuit as defined in claim 1 wherein said feedback means includes diodes.
Claim 6
Dependent Claim
24 words
A sensing circuit as defined in claim 1 wherein said sensing circuit includes a second amplifier connected at the output of said summing junction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |