Patent US3784781A successfully refreshed from Google Patents.
US3784781A
Expired / Lapsed
US
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Magnetron moding interrupter control circuit
Assignee: Goodman Co LP
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Filing: 1973-04-11
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Granted: 1974-01-08
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Expires: 1993-04-11
Abstract
Abstract A magnetron operating control circuit is disclosed including means for sensing the commencement of electromagnetic energy radiation and means derived from the sensing means to interrupt the application of line voltages to the magnetron power supply and allow the voltages to decrease for a sufficient time to shift to desired normal operating mode conditions when the supply is reenergized. The circuit incorporates a flexible sensing feature which accommodates the time of the interruption cycle to variations in tubes, line voltages and other circuit parameters, particularly in microwave oven apparatus to substantially reduce the magnetron moding problems.
Inventors
- 👤 R Foerstner
- 👤 R Fritts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:02
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/66; H05B6/666; H03; H03B; H03B9/00; H03B9/01; H03B9/10; H05B2206/00; H05B2206/04; H05B2206/043
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
In combination: an electromagnetic energy generator; means for energizing said generator including an Ac voltage source and power supply comprising a transformer power relay and high voltage DC rectification means; means for energizing said voltage source to operate said generator including a power relay and semiconductor means; means for sensing commencement of operation of said generator comprising an energy radiation detector to derive an electrical signal; means for filtering, amplifying and coupling said derived signal to a interrupt circuit means including semiconductor means and a charging capacitor to fire said last named means to interrupt operation of said generator for a predetermined period of time determined by storage of electrical energy in said capacitor by opening said power relay.
Claim 2
Dependent Claim
119 words
In combination: an electromagnetic energy generator; means for energizing said generator including an Ac voltage source and power supply comprising a transformer power relay and high voltage DC rectification means; means for energizing said voltage source to operate said generator including a power relay and semiconductor means; means for sensing commencement of operation of said generator comprising an energy radiation detector to derive an electrical signal; means for filtering, amplifying and coupling said derived signal to a interrupt circuit means including semiconductor means and a charging capacitor to fire said last named means to interrupt operation of said generator for a predetermined period of time determined by storage of electrical energy in said capacitor by opening said power relay.
Claim 3
Dependent Claim
23 words
The combination according to claim 1 wherein said energizing means comprise a diode rectifier, a first silicon controlled rectifier, and electrical filter means.
Claim 4
Dependent Claim
57 words
The combination according to claim 2 wherein said interrupt circuit means includes a unijunction device and a second silicon controlled rectifier interconnected to said first silicon controlled rectifier by a transistor device having a grounded electrode when in the conductive state to ground said first rectifier and allow said power relay to open deenergizing said voltage source.
Claim 5
Dependent Claim
100 words
A microwave oven apparatus comprising: an enclosure; a magnetron energy generator, means for coupling from said generator to be radiated within said enclosure; means for energizing said generator including an AC voltage source and power supply comprising a transformer power relay, and high voltage DC rectification means; means for energizing said voltage source to operate said generator; means for sensing radiation of energy in said coupling means to derive and electrical signal; electrical circuit means for filtering, amplifying and utilizing said derived signal to interrupt operation of said magnetron for a predetermined period of time by opening said power relay.
Claim 6
Dependent Claim
100 words
A microwave oven apparatus comprising: an enclosure; a magnetron energy generator, means for coupling from said generator to be radiated within said enclosure; means for energizing said generator including an AC voltage source and power supply comprising a transformer power relay, and high voltage DC rectification means; means for energizing said voltage source to operate said generator; means for sensing radiation of energy in said coupling means to derive and electrical signal; electrical circuit means for filtering, amplifying and utilizing said derived signal to interrupt operation of said magnetron for a predetermined period of time by opening said power relay.
Claim 7
Dependent Claim
13 words
The apparatus according to claim 4 wherein said magnetron includes an output antenna.
Claim 8
Dependent Claim
17 words
The apparatus according to claim 4 wherein said energy coupling means comprise a hollow waveguide transmission section.
Claim 9
Dependent Claim
29 words
The apparatus according to claim 4 wherein said magnetron includes an output antenna and said energy coupling means comprise a hollow waveguide transmission section with said antenna disposed therein.
Claim 10
Dependent Claim
24 words
The apparatus according to claim 7 wherein means for sensing energy radiation comprise a diode rectifier adapted to detect energy radiated from said antenna.
References Cited (Backward Citations)
US3611027A
Cited
US3752948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |