Patent US3676782A successfully refreshed from Google Patents.
US3676782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified on-off control
Assignee: Applied Automation Inc
•
Filing: 1970-06-22
•
Granted: 1972-07-11
•
Expires: 1990-06-22
Abstract
Abstract A modified on-off controller is formed by adding an alternating signal to the error signal. The frequency of the added signal is sufficiently high to prevent the control element from responding at this frequency. A derivative signal can also be added.
Inventors
- 👤 Donald W Lane
- 👤 Troy J Pemberton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:01
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/387; G; G05; G05B; G05B11/00; G05B11/01; G05B11/14; G05B11/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
Control apparatus comprising: signal comparing means adapted to receive an input measurement signal and a set point signal and establish a first signal representative of any difference therebetween; signal summing means; an oscillator adapted to provide an alternating signal; and means applying said first signal and said alternating signal simultaneously to said summing means, the output of said summing means comprising the output control signal of said apparatus.
Claim 2
Dependent Claim
68 words
Control apparatus comprising: signal comparing means adapted to receive an input measurement signal and a set point signal and establish a first signal representative of any difference therebetween; signal summing means; an oscillator adapted to provide an alternating signal; and means applying said first signal and said alternating signal simultaneously to said summing means, the output of said summing means comprising the output control signal of said apparatus.
Claim 3
Dependent Claim
54 words
The apparatus of claim 1, further comprising circuit means adapted to establish an output signal representative of the derivative of an input signal applied thereto; means to apply the input measurement signal to the input of said circuit means; and means to apply the output signal of said circuit means to said summing means.
Claim 4
Dependent Claim
32 words
The apparatus of claim 1 wherein said summing means comprises a summing amplifier having a zener diode connected in a feedback path between the output and the input of said summing amplifier.
Claim 5
Dependent Claim
33 words
The apparatus of claim 1, further comprising means responsive to the output signal from said summing means to convert such output signal into a current proportional to the amplitude of such output signal.
Claim 6
Dependent Claim
27 words
The apparatus of claim 4, further comprising an impedance element connected to said means to establish a current so that said current flows through said impedance element.
Claim 7
Dependent Claim
23 words
The apparatus of claim 1 wherein the frequency of said alternating signal is in the range of 100 to 1,000 cycles per second.
References Cited (Backward Citations)
US3492471A
Cited
US3566282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |