Patent US3851278A successfully refreshed from Google Patents.
US3851278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter circuit
Assignee: Bell and Howell Japan
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Filing: 1973-06-12
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Granted: 1974-11-26
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Expires: 1993-06-12
Abstract
Abstract An improvement is disclosed for converting variable input voltages to alternating current outputs of constant voltage. The circuit provides a lighter, more simple and more economical converter by providing a second output transformer with a feedback circuit connected to actuate switching transistors and a saturable input transformer. The power, which may have been of either alternating or direct current origin, is converted to alternating current and fed to a first output transformer for gross conversion and to a second output transformer for finer adjustments to the desired constant output voltage.
Inventors
- 👤 T Isono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:27
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H02M7/53846; H02M7/53862
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
An inverter circuit for converting variable voltage inputs of direct current to alternating current at a constant output voltage comprising: a saturable transformer; a pair of switching transistors in operative connection with said saturable transformer; an output transformer having a bifilar coiled primary consisting of two coils with one of said coils connected to one of said transistors and the other of said coils connected to the other of said transistors for converting said direct current to alternating current for application to the secondary of said output transformer; and a second output transformer having the primary thereof connected to the secondary of said first output transformer and having the secondary thereof include a load output coil and a feedback output coil for regulating the saturating frequency applied to said saturable transformer.
Claim 2
Dependent Claim
131 words
An inverter circuit for converting variable voltage inputs of direct current to alternating current at a constant output voltage comprising: a saturable transformer; a pair of switching transistors in operative connection with said saturable transformer; an output transformer having a bifilar coiled primary consisting of two coils with one of said coils connected to one of said transistors and the other of said coils connected to the other of said transistors for converting said direct current to alternating current for application to the secondary of said output transformer; and a second output transformer having the primary thereof connected to the secondary of said first output transformer and having the secondary thereof include a load output coil and a feedback output coil for regulating the saturating frequency applied to said saturable transformer.
Claim 3
Dependent Claim
27 words
An inverter circuit as in claim 1 including taps adjusting the output of said output transformers for modifying said output voltage in accord with the input voltage.
References Cited (Backward Citations)
US2997664A
Cited
US3002142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |