US4156234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital angle to resolver/synchro converter
Assignee: GE Medical Systems Information Technologies GmbH
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Filing: 1978-05-05
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Granted: 1979-05-22
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Expires: 1998-05-05
Abstract
Abstract A digital angle to resolver/synchro converter is disclosed which utilizes the tangent of the input angle in a unique feedback loop.
Inventors
- 👤 Kalman Molnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:14
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/66; H03M1/665; G; G06; G06G; G06G7/00; G06G7/12; G06G7/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
Apparatus for converting digital format angle information to resolver format information having sine and cosine terms, comprising: first means to generate a signal related to the tangent of the digital format angle information; second means to multiply the tangent signal by the cosine term; third means responsive to the multiplier means for subtracting the sine term from the output thereof; a high gain amplifier responsive to the third means to generate the sine term; and fourth means to combine the sine term with a sinusoidally varying reference to generate the cosine term.
Claim 2
Dependent Claim
92 words
Apparatus for converting digital format angle information to resolver format information having sine and cosine terms, comprising: first means to generate a signal related to the tangent of the digital format angle information; second means to multiply the tangent signal by the cosine term; third means responsive to the multiplier means for subtracting the sine term from the output thereof; a high gain amplifier responsive to the third means to generate the sine term; and fourth means to combine the sine term with a sinusoidally varying reference to generate the cosine term.
Claim 3
Dependent Claim
28 words
The apparatus claimed in claim 1, wherein the fourth means includes: fifth means for multiplying the sine term by a constant value C before combining with the reference.
Claim 4
Dependent Claim
12 words
The apparatus of claim 2, wherein C has the value of √2-1.
Claim 5
Dependent Claim
21 words
The apparatus of claim 1, wherein the first means includes: a digital tangent function generator; and a digital-to-analog converter connected thereto.
Claim 6
Dependent Claim
13 words
The apparatus of claim 1, wherein the second means includes: a digital-to-analog converter.
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) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |