US4787020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Full-wave output type forward converter
Assignee: Densetsu Corp
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Filing: 1988-02-16
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Granted: 1988-11-22
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Expires: 2008-02-16
Abstract
Abstract Disclosed is a full-wave output type forward converter wherein a main transformer having a primary winding connected in series with a switching element includes two secondary windings as winding halves divided by a center tap and electromagnetically coupled. A leakage self inductance can be reduced to obtain a high-frequency, high-power arrangement.
Inventors
- 👤 Rihei Hiramatsu
- 👤 Tokunari Inoue
- 👤 Kazushi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:18
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33538; H02M3/33546; H02M3/33553
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A full-wave output type forward converter comprising a power input unit obtained by connecting a switching element in series with a primary winding of a main transformer and an output unit obtained by connecting a rectifier circuit and a filter circuit to secondary windings of said main transformer, said converter being adapted to detect and amplify an output voltage from said output unit to control an ON time ratio of said switching element, wherein said main transformer comprises an iron core having a gap and said secondary windings arranged such that two windings divided by a center tap are alternately connected at the turn start and end portions so as to alternately arrange said two windings, anodes of two diodes are respectively connected to one end of a corresponding one of said secondary windings and said center tap, cathodes of said diodes are connected to one end of a corresponding one of choke coils, the other end of one choke coil is connected to the other end of the other choke coil to constitute one output terminal, said center tap serves as the other output terminal, and a capacitor is connected between said output terminals.
Claim 2
Dependent Claim
195 words
A full-wave output type forward converter comprising a power input unit obtained by connecting a switching element in series with a primary winding of a main transformer and an output unit obtained by connecting a rectifier circuit and a filter circuit to secondary windings of said main transformer, said converter being adapted to detect and amplify an output voltage from said output unit to control an ON time ratio of said switching element, wherein said main transformer comprises an iron core having a gap and said secondary windings arranged such that two windings divided by a center tap are alternately connected at the turn start and end portions so as to alternately arrange said two windings, anodes of two diodes are respectively connected to one end of a corresponding one of said secondary windings and said center tap, cathodes of said diodes are connected to one end of a corresponding one of choke coils, the other end of one choke coil is connected to the other end of the other choke coil to constitute one output terminal, said center tap serves as the other output terminal, and a capacitor is connected between said output terminals.
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) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |