US4608533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic compensation circuit for use with analog multiplier
Assignee: Electric Power Research Institute
•
Filing: 1983-06-22
•
Granted: 1986-08-26
•
Expires: 2003-06-22
Abstract
Abstract An automatic compensation circuit for use with an analog multiplier is disclosed. At regular intervals at least one input to the analog multiplier is constrained to be zero for a short time. During this time a sample and hold circuit retains the pre-existing output voltage and a feedback circuit is activated which adjusts the output voltage of the multiplier to zero, thereby providing an accurate multiplied or product signal, typically representing power consumption, which is adjusted or compensated for the effects of any internal errors occurring within the analog multiplier.
Inventors
- 👤 Alan H. Starkie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:26
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
An automatic compensation circuit comprising an analog multiplier connected to receive a first signal representing instantaneous voltage and a second signal representing instantaneous current for generating a third current signal representing the product of said first and second signals, means for converting said third current signal to a fourth voltage signal, and compensation means connected to said converting means for adjusting the output of said converting means to zero during zero crossing points of at least one of said first or second signals.
Claim 2
Dependent Claim
83 words
An automatic compensation circuit comprising an analog multiplier connected to receive a first signal representing instantaneous voltage and a second signal representing instantaneous current for generating a third current signal representing the product of said first and second signals, means for converting said third current signal to a fourth voltage signal, and compensation means connected to said converting means for adjusting the output of said converting means to zero during zero crossing points of at least one of said first or second signals.
Claim 3
Dependent Claim
101 words
In an electronic watt-hour meter, an automatic compensation circuit comprising an analog multiplier connected to receive a first signal representing instantaneous voltage and a second signal representing instantaneous current for generating a third current signal representing the product of said first and seconds signals, means for converting said third signal to a fourth voltage signal, compensation means connected to said converting means for adjusting the output of said converting means to zero during zero crossing points of at least one of said first or second signals, and sample and hold means for storing the fourth voltage signal during the respective interval.
Claim 4
Dependent Claim
101 words
In an electronic watt-hour meter, an automatic compensation circuit comprising an analog multiplier connected to receive a first signal representing instantaneous voltage and a second signal representing instantaneous current for generating a third current signal representing the product of said first and seconds signals, means for converting said third signal to a fourth voltage signal, compensation means connected to said converting means for adjusting the output of said converting means to zero during zero crossing points of at least one of said first or second signals, and sample and hold means for storing the fourth voltage signal during the respective interval.
Claim 5
Dependent Claim
53 words
A circuit as in claim 2 including first switch means for normally connecting said first signal to said analog multiplier, second switch means for connecting a zero value to said analog multiplier during said zero crossings of said first or second signals, and control means for controlling said first and second switch means.
Claim 6
Dependent Claim
60 words
A circuit as in claim 3 including third switch means for normally connecting said fourth signal to said sample and hold means, fourth switch means for connecting said fourth signal through said compensation means to said connecting means during said zero crossing points of said first or second signals, and control means for controlling said third and fourth switch means.
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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |