US4079250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmable voltage sensing circuit
Assignee: Individual
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Filing: 1976-12-16
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Granted: 1978-03-14
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Expires: 1996-12-16
Abstract
Abstract A simple, reliable and sensitive electrical circuit for detecting when a first input exceeds a second input and vice versa and producing corresponding signals at first and second outputs comprising first and second operational amplifiers each having its negative input connected to its output and its positive input serving as a circuit input to function as a voltage follower, first and second comparator circuits with the positive input to the first comparator being directly connected to the output of the first amplifier and the negative input to the output of the second amplifier via voltage dividing resistors so that the output thereof goes to zero when the output of the first amplifier drops below the divided output of the second and with the second comparator similarly connected so that the output thereof goes to zero when the output of the second amplifier drops below the divided output of the first amplifier. The circuit finds particular utility in a system for detecting yarn or thread breakage or for counting.
Inventors
- 👤 James M. Jeffcoat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:51
CPC Classifications
H; H03; H03K; H03K21/00; H03K21/02; B; B65; B65H; B65H63/00; B65H63/02; B65H63/024; B65H63/028; B65H63/032; B65H63/0321; B65H63/0324; D; D04; D04B; D04B35/00; D04B35/10; D04B35/14; G; G01; G01R; G01R19/00; G01R19/0038; G01V; G01V8/00; G01V8/10; G01V8/20; H03K5/00; H03K5/22; H03K5/24; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
305 words
A circuit for providing a first given output signal at a first output when an input signal at a first input exceeds an input signal at a second input by a predetermined magnitude and a second given output signal at a second output when an input signal at said second input exceeds an input signal at said first input by a predetermined magnitude comprising: a first operational amplifier having first and second inputs and an output with one input thereof comprising said first input of said circuit and the other input connected to the output thereof, a second operational amplifier having first and second inputs and an output with one input thereof comprising said second input of said circuit and the other input connected to the output thereof, a first comparator having first and second inputs and an output for producing a signal at the output thereof which is a function of the difference between the input signals, said first comparator having its first input connected to the output of said first amplifier, a second comparator having first and second inputs and an output for producing a signal at the output thereof which is a function of the difference between the input signals, said second comparator having its first input connected to the output of said second amplifier, first resistance means connected to the output of said first amplifier and to the second input to said second comparator for dividing the output of said first amplifier and applying a signal reduced in magnitude to the second input to said second comparator, and second resistance means connected to the output of said second amplifier and to the second input to said first comparator for dividing the output of said second amplifier and applying a signal reduced in magnitude to the second input to said first comparator.
Claim 2
Dependent Claim
305 words
A circuit for providing a first given output signal at a first output when an input signal at a first input exceeds an input signal at a second input by a predetermined magnitude and a second given output signal at a second output when an input signal at said second input exceeds an input signal at said first input by a predetermined magnitude comprising: a first operational amplifier having first and second inputs and an output with one input thereof comprising said first input of said circuit and the other input connected to the output thereof, a second operational amplifier having first and second inputs and an output with one input thereof comprising said second input of said circuit and the other input connected to the output thereof, a first comparator having first and second inputs and an output for producing a signal at the output thereof which is a function of the difference between the input signals, said first comparator having its first input connected to the output of said first amplifier, a second comparator having first and second inputs and an output for producing a signal at the output thereof which is a function of the difference between the input signals, said second comparator having its first input connected to the output of said second amplifier, first resistance means connected to the output of said first amplifier and to the second input to said second comparator for dividing the output of said first amplifier and applying a signal reduced in magnitude to the second input to said second comparator, and second resistance means connected to the output of said second amplifier and to the second input to said first comparator for dividing the output of said second amplifier and applying a signal reduced in magnitude to the second input to said first comparator.
Claim 3
Dependent Claim
15 words
A circuit as in claim 1 wherein said first and second resistance means are variable.
Claim 4
Dependent Claim
29 words
A circuit as in claim 1 wherein said comparators are each operational amplifiers with the positive input being said first input and the negative input being said second input.
Claim 5
Independent Claim
350 words
A system for detecting passage of a light varying object comprising: a first photoresistor sensor for producing a voltage signal when the incident light thereon varies, a second photoresistor sensor for producing a voltage signal when the incident light thereon varies, a light source, means for mounting said first and second sensors and said source so that light from said source is incident upon said first and second sensors and said object passes between said sensors and source to in sequence break the path between said first sensor and source and then the path between said second sensor and source to cause said first and second sensors to sequentially produce said voltage signals, a first operational amplifier having first and second inputs and an output with one input thereof connected to said first sensor and the other input connected to the output thereof, a second operational amplifier having first and second inputs and an output with one input thereof connected to said second sensor and the other input connected to the output thereof, a first comparator having first and second inputs and an output for producing a signal at the output thereof which is a function of the difference between the input signals, said first comparator having its first input connected to the output of said first amplifier, a second comparator having first and second inputs and an output for producing a signal at the output thereof which is a function of the difference between the input signals, said second comparator having its first input connected to the output of said second amplifier, first resistance means connected to the output of said first amplifier and to the second input to said second comparator for dividing the output of said first amplifier and applying a signal reduced in magnitude to the second input to said second comparator, and second resistance means connected to the output of said second amplifier and to the second input to said first comparator for dividing the output of said second amplifier and applying a signal reduced in magnitude to the second input to said first comparator.
Claim 6
Independent Claim
350 words
A system for detecting passage of a light varying object comprising: a first photoresistor sensor for producing a voltage signal when the incident light thereon varies, a second photoresistor sensor for producing a voltage signal when the incident light thereon varies, a light source, means for mounting said first and second sensors and said source so that light from said source is incident upon said first and second sensors and said object passes between said sensors and source to in sequence break the path between said first sensor and source and then the path between said second sensor and source to cause said first and second sensors to sequentially produce said voltage signals, a first operational amplifier having first and second inputs and an output with one input thereof connected to said first sensor and the other input connected to the output thereof, a second operational amplifier having first and second inputs and an output with one input thereof connected to said second sensor and the other input connected to the output thereof, a first comparator having first and second inputs and an output for producing a signal at the output thereof which is a function of the difference between the input signals, said first comparator having its first input connected to the output of said first amplifier, a second comparator having first and second inputs and an output for producing a signal at the output thereof which is a function of the difference between the input signals, said second comparator having its first input connected to the output of said second amplifier, first resistance means connected to the output of said first amplifier and to the second input to said second comparator for dividing the output of said first amplifier and applying a signal reduced in magnitude to the second input to said second comparator, and second resistance means connected to the output of said second amplifier and to the second input to said first comparator for dividing the output of said second amplifier and applying a signal reduced in magnitude to the second input to said first comparator.
References Cited (Backward Citations)
US3931513A
Cited
US3943367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |