Patent US4481447A successfully refreshed from Google Patents.
US4481447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply for a magnetron
Assignee: Philips North America LLC
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Filing: 1982-06-21
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Granted: 1984-11-06
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Expires: 2002-06-21
Abstract
Abstract A method of controlling the power output of a magnetron tube, and an electric power supply for supplying power to the tube. According to the method, power is continuously supplied to the magnetron heater. At the same time, a voltage is continuously applied across the anode and the cathode of the tube. This voltage across the anode and the cathode varies in cycles between a first value, which is substantially at or below the threshold voltage of the magnetron tube, and a second value, which is above the threshold voltage. The average magnetron power output is determined by the proportion of each cycle during which the voltage across the anode and the cathode is above the threshold voltage.
Inventors
- 👤 Edward H. Stupp
- 👤 Mark W. Fellows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:07
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/66; H05B6/666; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/10; H02M7/103; H05B2206/00; H05B2206/04; H05B2206/043
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
An electric power supply for a magnetron, said magnetron having a heater, a cathode, and an anode, and having a threshold voltage value between the anode and cathode above which electric current flows from the anode to the cathode, said power supply comprising: power supply means for continuously supplying power to the heater; and voltage supply means for continuously supplying a voltage across the anode and the cathode, said voltage varying between a first value, which is substantially at or below the threshold voltage, and a second value, which is above the threshold voltage; characterized in that the means for continuously supplying a voltage across the anode and the cathode comprises a voltage multiplier circuit having at least two stages, at least one but not all of which stages are switchably connected in the circuit.
Claim 2
Dependent Claim
135 words
An electric power supply for a magnetron, said magnetron having a heater, a cathode, and an anode, and having a threshold voltage value between the anode and cathode above which electric current flows from the anode to the cathode, said power supply comprising: power supply means for continuously supplying power to the heater; and voltage supply means for continuously supplying a voltage across the anode and the cathode, said voltage varying between a first value, which is substantially at or below the threshold voltage, and a second value, which is above the threshold voltage; characterized in that the means for continuously supplying a voltage across the anode and the cathode comprises a voltage multiplier circuit having at least two stages, at least one but not all of which stages are switchably connected in the circuit.
Claim 3
Dependent Claim
33 words
An electric power supply as claimed in claim 1, characterized in that the power supply further comprises control means for varying the voltage across the anode and the cathode in a repeating cycle.
Claim 4
Dependent Claim
35 words
An electric power supply as claimed in claim 2, characterized in that the control means regulates the proportion of each cycle during which the voltage across the anode and cathode is above the threshold voltage.
Claim 5
Dependent Claim
57 words
An electric power supply as claimed in claim 3, characterized in that the means for continuously supplying a voltage across the anode and cathode further comprises: a switch-mode power supply which produces a controllable DC output; and a voltage-controlled power oscillator, which produces an AC output having a controllable voltage to be fed to the voltage multiplier.
Claim 6
Dependent Claim
24 words
An electric power supply as claimed in claim 4, characterized in that the means for contiuously supplying power to the heater comprises a transformer.
Claim 7
Dependent Claim
136 words
A microwave generator comprising: a magnetron having a heater, a cathode, and an anode, said magnetron having a threshold voltage value between the anode and the cathode above which electric current flows from the anode to the cathode; and an electric power supply comprising: power supply means for continuously supplying power to the heater; and voltage supply means for continuously supplying a voltage across the anode and the cathode, said voltage varying between a first value, which is substantially at or below the threshold voltage, and a second value, which is above the threshold voltage; characterized in that the means for continuously supplying a voltage across the anode and the cathode comprises a voltage multiplier circuit having at least two stages, at least one but not all of which stages are switchably connected in the circuit.
Claim 8
Dependent Claim
136 words
A microwave generator comprising: a magnetron having a heater, a cathode, and an anode, said magnetron having a threshold voltage value between the anode and the cathode above which electric current flows from the anode to the cathode; and an electric power supply comprising: power supply means for continuously supplying power to the heater; and voltage supply means for continuously supplying a voltage across the anode and the cathode, said voltage varying between a first value, which is substantially at or below the threshold voltage, and a second value, which is above the threshold voltage; characterized in that the means for continuously supplying a voltage across the anode and the cathode comprises a voltage multiplier circuit having at least two stages, at least one but not all of which stages are switchably connected in the circuit.
Claim 9
Dependent Claim
32 words
A microwave generator as claimed in claim 6, characterized in that the power supply further comprises control means for varying the voltage across the anode and the cathode in a repeating cycle.
Claim 10
Dependent Claim
34 words
A microwave generator as claimed in claim 7, characterized in that the control means regulates the proportion of each cycle during which the voltage across the anode and cathode is above the threshold voltage.
Claim 11
Dependent Claim
56 words
A microwave generator as claimed in claim 8, characterized in that the means for continuously supplying a voltage across the anode and cathode further comprises: a switch-mode power supply which produces a controllable DC output; and a voltage-controlled power oscillator, which produces an AC output having a controllable voltage to be fed to the voltage multiplier.
Claim 12
Dependent Claim
23 words
A microwave generator as claimed in claim 9, characterized in that the means for continuously supplying power to the heater comprises a transformer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |