US4833581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply for a magnetron
Assignee: Hitachi Ltd
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Filing: 1987-10-13
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Granted: 1989-05-23
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Expires: 2007-10-13
Abstract
Abstract A power supply for a magnetron comprises an inverter circuit for converting a direct voltage obtained from a commercial frequency power source into an alternating voltage of a higher frequency by switching a switching element, a transformer with its primary winding connected to the inverter circuit, a voltage doubler with its input connected to a secondary winding of the transformer and with its output connected between a filament and an anode of a magnetron, and a resonant circuit formed in the voltage doubler for smoothing a current through the magnetron.
Inventors
- 👤 Kunio Ishiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:49
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33538; H05B6/66; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
A power supply for a magnetron having a filament and an anode comprising: an inverter circuit including a transformer having a primary winding and a secondary winding, means for supplying to said secondary winding pulses of current recurring at a frequency and switching means for successively switching direct input energy therefore; a voltage doubler circuit including a condenser, a diode, an input and an output, said input being connected to said transformer secondary winding and said output being connected between said magnetron filament and anode; and a series resonant circuit formed in series with secondary winding and including said condenser, said resonant circuit being tuned at a frequency not lower than a frequency of said pulses of current and such that a wave shape of current through said secondary winding may be smoothly continuous.
Claim 2
Dependent Claim
134 words
A power supply for a magnetron having a filament and an anode comprising: an inverter circuit including a transformer having a primary winding and a secondary winding, means for supplying to said secondary winding pulses of current recurring at a frequency and switching means for successively switching direct input energy therefore; a voltage doubler circuit including a condenser, a diode, an input and an output, said input being connected to said transformer secondary winding and said output being connected between said magnetron filament and anode; and a series resonant circuit formed in series with secondary winding and including said condenser, said resonant circuit being tuned at a frequency not lower than a frequency of said pulses of current and such that a wave shape of current through said secondary winding may be smoothly continuous.
Claim 3
Dependent Claim
138 words
A power supply for a magnetron having a filament and an anode comprising: an inverter circuit including a transformer having a primary winding and a secondary winding, means for supplying to said secondary winding pulses of current recurring at a frequency and switching means for successively switching direct input energy therefore; a voltage doubler circuit including a condenser, a diode, an input and an output, said input being connected to said transformer secondary winding and said output being connected between said magnetron filament and anode; and a series resonant circuit formed in series with secondary winding and including said condenser and a choke coil, said resonant circuit being tuned at a frequency not lower than a frequency of said pulses of current and such that a wave shape of current through said secondary winding may be smoothly continuous.
Claim 4
Dependent Claim
138 words
A power supply for a magnetron having a filament and an anode comprising: an inverter circuit including a transformer having a primary winding and a secondary winding, means for supplying to said secondary winding pulses of current recurring at a frequency and switching means for successively switching direct input energy therefore; a voltage doubler circuit including a condenser, a diode, an input and an output, said input being connected to said transformer secondary winding and said output being connected between said magnetron filament and anode; and a series resonant circuit formed in series with secondary winding and including said condenser and a choke coil, said resonant circuit being tuned at a frequency not lower than a frequency of said pulses of current and such that a wave shape of current through said secondary winding may be smoothly continuous.
Claim 5
Dependent Claim
102 words
A power supply for a magnetron according to claim 2 wherein said resonant circuit is formed of said choke coil and said condenser satifying the following equation, ##EQU2## where f (Hz) is the frequency of said pulses of current through said primary winding, n is the ratio of secondary to primary winding turns of said transformer, Cs (F) is the capacitance of a condenser connected in series with said primary winding, Lh (H) is the inductance of said choke coil, Ch (F) is the capacitanceof said condenser, L'h (H) is Lh/n 2 , C'h (F)═Ch.n 2 , K is 1.0 to 1.2.
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) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |