US3833860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier system having pseudo summing junction
Assignee: ABB Automation Inc
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Filing: 1972-04-20
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Granted: 1974-09-03
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Expires: 1992-04-20
Abstract
Abstract A summing amplifier system having a pseudo summing junction in a feedback network for biasing the output of the system by a DC voltage while simultaneously applying a second voltage to a conventional summing junction of the system. As a process variable controller, the system provides proportional control, the said second voltage representing deviation of the process variable, and manual reset, the said DC voltage representing a manual reset voltage.
Inventors
- 👤 J Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:15
CPC Classifications
G; G05; G05B; G05B6/00; G05B6/02; G05B5/00; G05B5/01; G06; G06G; G06G7/00; G06G7/12; G06G7/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
A controller comprising, in combination, a high gain inverting amplifier having a first resistance connected at one end to the input of said amplifier and having a second resistance connected at one end to the output of said amplifier for receiving output therefrom, said second resistance having its other end connected to circuit common for said amplifier; there being a third resistance connected at one end to a first point on said second resistance for applying voltage to said second resistance at said first point; and there being a feedback resistance connected between said input and a sEcond point on said second resistance for feedback of voltage at said second point to said input, said first point being at least as far away electrically from said circuit common as is said second point.
Claim 2
Dependent Claim
133 words
A controller comprising, in combination, a high gain inverting amplifier having a first resistance connected at one end to the input of said amplifier and having a second resistance connected at one end to the output of said amplifier for receiving output therefrom, said second resistance having its other end connected to circuit common for said amplifier; there being a third resistance connected at one end to a first point on said second resistance for applying voltage to said second resistance at said first point; and there being a feedback resistance connected between said input and a sEcond point on said second resistance for feedback of voltage at said second point to said input, said first point being at least as far away electrically from said circuit common as is said second point.
Claim 3
Dependent Claim
20 words
The controller of claim 1, wherein a variable voltage source is connected to the other end of said third resistance.
Claim 4
Dependent Claim
22 words
The controller of claim 2, wherein a source of process deviation voltage is connected to the other end of said first resistance.
Claim 5
Dependent Claim
16 words
The controller of claim 1 wherein said second resistance includes a variable portion between said points.
Claim 6
Dependent Claim
21 words
The controller of claim 1 wherein said second resistance includes a variable portion between said second point and said circuit common.
Claim 7
Dependent Claim
28 words
The controller of claim 1, wherein said second resistance includes a variable portion between said points, and a variable portion between said second point and said circuit common.
Claim 8
Dependent Claim
40 words
The controller of claim 1 wherein said second resistance includes a resistor between said first point and said circuit common, said resistor having a slider movable along said resistor and connected to said feedback resistance for providing said second point.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |