US3671847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply for driving magnetron
Assignee: Panasonic Holdings Corp
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Filing: 1970-08-28
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Granted: 1972-06-20
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Expires: 1990-08-28
Abstract
Abstract A compact power supply for driving a magnetron to oscillation used for an electronic cooking range. A transformer having a three-legged magnetic core with at least primary, secondary and tertiary windings. The primary winding is divided into two halves, each wound on a separate leg of the core and switching means are provided for changing the direction of the magnetic flux produced by one half of the winding with respect to the other half. The secondary winding is linked by the flux from each half of the primary winding and is arranged to selectively provide the magnetron with high voltage in accordance with the position of the switching means. The tertiary winding, which is arranged to provide voltage to the magnetron heater, is linked to the flux produced by only one of the halves of the primary winding winding regardless of the position of the switching means.
Inventors
- 👤 Takashi Shibano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:54
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/66; H05B6/666; H03; H03B; H03B9/00; H03B9/01; H03B9/10; H05B6/68; H05B6/687; H01; H01F; H01F38/00; H01F2038/003
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A power supply for a magnetron oscillator comprising a transformer having a three legged magnetic core, a primary winding divided into halves, each half being wound on one of the outer legs of the core, a secondary winding wound on the center leg of the core for providing the magnetron with high voltage and a third winding wound on either one of the outer legs of the core for providing the cathode of the magnetron with heating power, and switching means connected with said halves of the primary winding to change the direction of the magnetic flux produced by one of said half primary windings in relation to that produced by the other half primary winding while said halves of the primary winding are connected in parallel so that said third winding can be always energized to produce a constant output power irrespective of energization or de-energization of said secondary winding.
Claim 2
Dependent Claim
151 words
A power supply for a magnetron oscillator comprising a transformer having a three legged magnetic core, a primary winding divided into halves, each half being wound on one of the outer legs of the core, a secondary winding wound on the center leg of the core for providing the magnetron with high voltage and a third winding wound on either one of the outer legs of the core for providing the cathode of the magnetron with heating power, and switching means connected with said halves of the primary winding to change the direction of the magnetic flux produced by one of said half primary windings in relation to that produced by the other half primary winding while said halves of the primary winding are connected in parallel so that said third winding can be always energized to produce a constant output power irrespective of energization or de-energization of said secondary winding.
Claim 3
Dependent Claim
171 words
A power supply for a magnetron oscillator comprising a transformer which has a three-legged magnetic core, a primary winding divided into halves, each half being wound on one of the outer legs of the core, a secondary winding divided into halves, each half being wound on one of the outer legs of the core, said halves of the secondary winding being connected in series, the secondary winding providing the magnetron with high voltage, and a third winding wound on either one of the outer legs of the core for providing the cathode of tHe magnetron with heating power; and switching means connected with said halves of the primary winding to change the direction of the magnetic flux produced by one of said half primary windings in relation to that produced by the other half primary winding while said halves of the primary winding are connected in parallel so that said third winding can be always energized to produce a constant output power irrespective of energization or de-energization of said secondary winding.
Claim 4
Dependent Claim
171 words
A power supply for a magnetron oscillator comprising a transformer which has a three-legged magnetic core, a primary winding divided into halves, each half being wound on one of the outer legs of the core, a secondary winding divided into halves, each half being wound on one of the outer legs of the core, said halves of the secondary winding being connected in series, the secondary winding providing the magnetron with high voltage, and a third winding wound on either one of the outer legs of the core for providing the cathode of tHe magnetron with heating power; and switching means connected with said halves of the primary winding to change the direction of the magnetic flux produced by one of said half primary windings in relation to that produced by the other half primary winding while said halves of the primary winding are connected in parallel so that said third winding can be always energized to produce a constant output power irrespective of energization or de-energization of said secondary winding.
Claim 5
Dependent Claim
207 words
A power supply for a magnetron oscillator comprising a transformer which has a three-legged magnetic core, a magnetic bypath being provided between the center leg and each outer leg dividing the center leg of said transformer into two equal sections, a primary winding divided into halves, each half being wound on each of the two sections of the center leg of the core, a secondary winding divided into halves, each half being wound on one of the two sections of the center leg of the core, said halves of the secondary winding being connected in series, the secondary winding providing the magnetron with high voltage, and a third winding wound on either one of the two sections of the center leg of the core for providing the cathode of the magnetron with heating power; and switching means connected with said halves of the primary winding to change the direction of the magnetic flux produced by one of said half primary windings in relation to that produced by the other half primary winding while said halves of the primary winding are connected in parallel so that said third winding can be always energized to produce a constant output power irrespective of energization or de-energization of said secondary winding.
Claim 6
Dependent Claim
207 words
A power supply for a magnetron oscillator comprising a transformer which has a three-legged magnetic core, a magnetic bypath being provided between the center leg and each outer leg dividing the center leg of said transformer into two equal sections, a primary winding divided into halves, each half being wound on each of the two sections of the center leg of the core, a secondary winding divided into halves, each half being wound on one of the two sections of the center leg of the core, said halves of the secondary winding being connected in series, the secondary winding providing the magnetron with high voltage, and a third winding wound on either one of the two sections of the center leg of the core for providing the cathode of the magnetron with heating power; and switching means connected with said halves of the primary winding to change the direction of the magnetic flux produced by one of said half primary windings in relation to that produced by the other half primary winding while said halves of the primary winding are connected in parallel so that said third winding can be always energized to produce a constant output power irrespective of energization or de-energization of said secondary winding.
Claim 7
Dependent Claim
214 words
A power supply for a magnetron oscillator comprising a transformer which has a three-legged magnetic core, a pair of halves of the primary winding, each of the pair being wound on each of the outer legs of the core, a secondary winding wound on the center leg of the core for providing the magnetron with a high voltage, a third winding wound on either one of the outer legs of the core for providing the cathode of the magnetron with a heating power, and a fourth winding wound on the center leg of the core; a first switching means connected with said halves of primary winding so as to be able to change the direction of the magnetic flux produced by one of said half primary windings in relation to that by the other half primary winding while said halves of primary winding are connected in series; and a second switching means connected across the terminals of the fourth winding, said second switching means being so interlocked with said first switching means that when the fluxes due to said half primary windings cancel each other in the center leg of the core, the fourth winding is closed, and when the fluxes due to said half primary windings are additive, the fourth winding is opened.
Claim 8
Dependent Claim
214 words
A power supply for a magnetron oscillator comprising a transformer which has a three-legged magnetic core, a pair of halves of the primary winding, each of the pair being wound on each of the outer legs of the core, a secondary winding wound on the center leg of the core for providing the magnetron with a high voltage, a third winding wound on either one of the outer legs of the core for providing the cathode of the magnetron with a heating power, and a fourth winding wound on the center leg of the core; a first switching means connected with said halves of primary winding so as to be able to change the direction of the magnetic flux produced by one of said half primary windings in relation to that by the other half primary winding while said halves of primary winding are connected in series; and a second switching means connected across the terminals of the fourth winding, said second switching means being so interlocked with said first switching means that when the fluxes due to said half primary windings cancel each other in the center leg of the core, the fourth winding is closed, and when the fluxes due to said half primary windings are additive, the fourth winding is opened.
Claim 9
Dependent Claim
43 words
A power supply for a magnetron oscillator as defined in claim 4, which is adapted so that at least one normally-open contact of said first switching means is connected in series with a door switch which is opened when the door is opened.
Claim 10
Dependent Claim
34 words
A power supply for a magnetron oscillator as defined in claim 4, which is adapted so that a door switch which is closed when the door is opened is connected across the fourth winding.
References Cited (Backward Citations)
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |