Patent US3575616A successfully refreshed from Google Patents.
US3575616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal conditioner
Assignee: General Electric Co
•
Filing: 1968-12-31
•
Granted: 1971-04-20
•
Expires: 1988-12-31
Abstract
Abstract A signal from a synchro-type transducer having rotor angular position information in the second harmonic is applied to a signal conditioning circuit. A resistive summing network is used to add, and difference amplifiers to subtract, components of the currents. The currents are gated to the difference amplifiers at double the fundamental frequency resulting in DC voltage levels proportional to the mechanical orientation of the rotor.
Inventors
- 👤 Harley D Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:26
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/22; G08; G08C; G08C19/00; G08C19/38; G08C19/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
In combination with a synchro-type transducer which produces alternating signals containing synchro rotor positional information in the second harmonic, a signal conditioning circuit comprising: a resistive summing network connected to said synchro-type transducer for adding said alternating signals; gating means connected to said summing network for gating the added signals at the frequency of the second harmonic so that only alternate half cycles of the second harmonic are passed; filter means connected to receive said gated signals and convert them to DC voltage levels; and means connected to said filter means for producing signals representing the difference between pairs of the resulting DC voltage levels.
Claim 2
Dependent Claim
105 words
In combination with a synchro-type transducer which produces alternating signals containing synchro rotor positional information in the second harmonic, a signal conditioning circuit comprising: a resistive summing network connected to said synchro-type transducer for adding said alternating signals; gating means connected to said summing network for gating the added signals at the frequency of the second harmonic so that only alternate half cycles of the second harmonic are passed; filter means connected to receive said gated signals and convert them to DC voltage levels; and means connected to said filter means for producing signals representing the difference between pairs of the resulting DC voltage levels.
Claim 3
Dependent Claim
178 words
In combination with a synchro-type transducer excited by an alternating current at a fundamental frequency and having four alternating signal outputs, V1 the fundamental, and V2, V3, and V4, containing second harmonics the amplitude of which depend upon the angular position of the synchro rotor, the improvement of a signal conditioner for producing DC voltage levels proportional to the sine and cosine of the angular position of the rotor such that sin Theta C1 (V3+V1-2V2) and cos Theta C2(V3- 1/3 (V1+2V4)) where Theta is the angle of the rotor and C1 and C2 are scaling factors comprising; a resistive summing network connected to said synchro-type transducer for performing the additions of said alternating signal outputs and applying the scaling factors; gating means connected to said summing network for gating the added signals at the frequency of the second harmonic so that only alternate half cycles of the second harmonic are passed; filter means connected to receive said gated signals and convert them to DC voltage leVels; and difference amplifiers connected to said filter means to perform the subtractions.
Claim 4
Dependent Claim
178 words
In combination with a synchro-type transducer excited by an alternating current at a fundamental frequency and having four alternating signal outputs, V1 the fundamental, and V2, V3, and V4, containing second harmonics the amplitude of which depend upon the angular position of the synchro rotor, the improvement of a signal conditioner for producing DC voltage levels proportional to the sine and cosine of the angular position of the rotor such that sin Theta C1 (V3+V1-2V2) and cos Theta C2(V3- 1/3 (V1+2V4)) where Theta is the angle of the rotor and C1 and C2 are scaling factors comprising; a resistive summing network connected to said synchro-type transducer for performing the additions of said alternating signal outputs and applying the scaling factors; gating means connected to said summing network for gating the added signals at the frequency of the second harmonic so that only alternate half cycles of the second harmonic are passed; filter means connected to receive said gated signals and convert them to DC voltage leVels; and difference amplifiers connected to said filter means to perform the subtractions.
Claim 5
Dependent Claim
26 words
A signal conditioner in accordance with claim 2 wherein: said gating means includes field effect transistors connected between said resistive summing network and said filter 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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |