Patent US5478774A successfully refreshed from Google Patents.
US3936732A
Expired / Lapsed
US
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Traveling wave tube body current sensor
Assignee: United States Department of the Air Force
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Filing: 1974-12-31
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Granted: 1976-02-03
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Expires: 1994-12-31
Abstract
Abstract The body current of a TWT (traveling wave tube) is measured by generating a voltage that is proportional to the difference between the cathode and collector currents of the TWT without materially affecting either by passing the cathode and collector currents through separate transformer windings, wound in opposition, on both a linear core transformer and a nonlinear core transformer with separate windings coupling each transformer to the other. A voltage pulse is introduced into another winding on the nonlinear transformer causing a current flow in the circuit coupling the two transformers, the voltage magnitude of which is proportional to the difference between the cathode and collector currents which is the body current.
Inventors
- 👤 Victor J. Modiano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:25
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/24; G01R31/25; G01R31/255
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
335 words
A traveling wave tube body current sensor for serially connecting between the cathode of the traveling wave tube and the cathode current power source and serially connecting between the collector of the traveling wave tube and the collector current power source, providing an output voltage proportional to the said body current, the said sensor comprising: a. a linear core transformer having a first winding and a second winding of substantially unity turns ratio wound in opposition, and a third winding; each winding having an input and an output connection; b. a nonlinear core transformer having a first winding and a second winding of substantially unity turns ratio wound in opposition, and a third winding, and a fourth winding, each winding having an input and an output connection; c. means for serially connecting the said first winding of the said linear core transformer with the said first winding of the said nonlinear core transformer and serially connecting the said serially connected first windings between the said cathode current source and the said cathode of the traveling wave tube; d. means for serially connecting the said second winding of the said linear core transformer with the said second winding of the said nonlinear core transformer and serially connecting the said serially connected second windings between the said collector current source and the said collector of the traveling wave tube; e. a pulse generator providing a constant pulse voltage; f. means including a first resistance for applying the said pulse voltage to the said third winding of the said nonlinear core transformer through the said first resistance; g. means for serially connecting the said third winding of the said linear core transformer with the said fourth winding of the said nonlinear core transformer; h. a second resistance connected across the said serially connected third and fourth windings; i. means for connecting the said first resistance to the said second resistance; and j. means for providing an output connection across the said connected first and the said second resistance.
Claim 2
Dependent Claim
335 words
A traveling wave tube body current sensor for serially connecting between the cathode of the traveling wave tube and the cathode current power source and serially connecting between the collector of the traveling wave tube and the collector current power source, providing an output voltage proportional to the said body current, the said sensor comprising: a. a linear core transformer having a first winding and a second winding of substantially unity turns ratio wound in opposition, and a third winding; each winding having an input and an output connection; b. a nonlinear core transformer having a first winding and a second winding of substantially unity turns ratio wound in opposition, and a third winding, and a fourth winding, each winding having an input and an output connection; c. means for serially connecting the said first winding of the said linear core transformer with the said first winding of the said nonlinear core transformer and serially connecting the said serially connected first windings between the said cathode current source and the said cathode of the traveling wave tube; d. means for serially connecting the said second winding of the said linear core transformer with the said second winding of the said nonlinear core transformer and serially connecting the said serially connected second windings between the said collector current source and the said collector of the traveling wave tube; e. a pulse generator providing a constant pulse voltage; f. means including a first resistance for applying the said pulse voltage to the said third winding of the said nonlinear core transformer through the said first resistance; g. means for serially connecting the said third winding of the said linear core transformer with the said fourth winding of the said nonlinear core transformer; h. a second resistance connected across the said serially connected third and fourth windings; i. means for connecting the said first resistance to the said second resistance; and j. means for providing an output connection across the said connected first and the said second resistance.
Claim 3
Dependent Claim
83 words
The apparatus as claimed in claim 1 wherein the turns ratio between the said first winding of the linear core transformer and the said first winding of the nonlinear core transformer is substantially unity, the turns ratio between the said third winding of the said linear core transformer and the said fourth winding of the said nonlinear core transformer is substantially unity, and the ohmic value of the said first resistance and the ohmic value of the said second resistance are substantially equal.
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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |