Patent US3702969A successfully refreshed from Google Patents.
US3702969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply circuit for continuous-wave magnetron
Assignee: International Standard Electric Corp
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Filing: 1971-09-10
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Granted: 1972-11-14
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Expires: 1991-09-10
Abstract
Abstract A power supply circuit for a continuous wave magnetron provides selectively adjustable microwave power levels that are stable at each level. The unregulated direct voltage supplied to the magnetron cathode is combined with an additional voltage derived from a common alternating current source to provide a total direct current which passes through the electromagnet coil of the magnetron. Variations in the power source are compensated by the variations of the added current in the coil to provide stable magnetron power at each level. The circuit providing the added current to the coil includes a simple rectifier, filter, zener diode and series resistor arrangement with a switch for selecting different diode, resistor and voltage combinations.
Inventors
- 👤 Jean Paul Maillot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:39
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/66; H05B6/666; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H03; H03B; H03B9/00; H03B9/01; H03B9/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
A continuous wave magnetron power supply circuit comprising: an alternating current pOwer source; a magnetron tube having an enclosed cathode and anode electrodes and an external electromagnetic coil; first direct current supply means including first rectifier and filter means connected between said alternating current power source and said magnetron electrodes and coil for supplying direct current thereto; second direct current supply means connected between said alternating current power source and said magnetron coil for supplying additional direct current to said coil, said second direct current means including second rectifier and filter means and a plurality of series connected circuit elements including a resistor and an electron discharge device having a stable characteristic breakdown voltage; and means for selectively adjusting said additional direct current supplied to said coil to establish a plurality of different stable power output levels.
Claim 2
Dependent Claim
137 words
A continuous wave magnetron power supply circuit comprising: an alternating current pOwer source; a magnetron tube having an enclosed cathode and anode electrodes and an external electromagnetic coil; first direct current supply means including first rectifier and filter means connected between said alternating current power source and said magnetron electrodes and coil for supplying direct current thereto; second direct current supply means connected between said alternating current power source and said magnetron coil for supplying additional direct current to said coil, said second direct current means including second rectifier and filter means and a plurality of series connected circuit elements including a resistor and an electron discharge device having a stable characteristic breakdown voltage; and means for selectively adjusting said additional direct current supplied to said coil to establish a plurality of different stable power output levels.
Claim 3
Dependent Claim
37 words
The device of claim 1 wherein said plurality of series connected circuit elements includes a plurality of resistors and said selectively adjusting means includes means for connecting selected numbers of said resistors in series with said coil.
Claim 4
Dependent Claim
39 words
The device of claim 1 wherein said plurality of series connected circuit elements includes a plurality of zener diodes and said selectively adjusting means includes means for connecting selected numbers of said zener diodes in series with said coil.
Claim 5
Dependent Claim
38 words
The device of claim 1 wherein said selectively adjusting means includes means connected to said source of alternating current power for adjusting the voltage from said alternating current power source connected to said second direct current supply means.
Claim 6
Dependent Claim
38 words
The device of claim 2 wherein said selectively adjusting means includes means connected to said source of alternating current power for adjusting the voltage from said alternating current power source connected to said second direct current supply means.
Claim 7
Dependent Claim
42 words
The device of claim 2 wherein said plurality of series connected circuit elements includes a further plurality of zener diodes and said selectively adjusting means includes means for connecting selected numbers of said zener diodes in series with said resistors and coil.
Claim 8
Dependent Claim
38 words
The device of claim 3 wherein said selectively adjusting means includes means connected to said source of alternating current power for adjusting the voltage from said alternating current power source connected to said second direct current supply means.
References Cited (Backward Citations)
US2979671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |