US5198969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soft-switching full-bridge dc/dc converting
Assignee: DESIGN AUTOMATION Inc
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Filing: 1992-01-13
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Granted: 1993-03-30
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Expires: 2012-01-13
Abstract
Abstract The addition of an external commutating inductor and two clamp diodes to the phase-shifted PWM full-bridge dc/dc converter substantially reduces the switching losses of the transistors and the rectifier diodes, under all loading conditions. We give analyses, practical design considerations, and experimental results for a 1.5-kW converter with 60-V, 25-A output, operating at 100-kHz clock frequency and 95% efficiency.
Inventors
- 👤 Richard Redl
- 👤 Laszlo Balogh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:02
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/08; H03K17/081; H03K17/0814; H03K17/08142; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33569; H02M3/33573; H02M3/01; H03K2217/00; H03K2217/0036
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
In a phase-shifted pulse-width-modulated soft-switching full-bridge dc/dc converter having first and second power-supply rails intercoupled by semiconductor switching devices characterized by switching losses and exchanging energy through a transformer coupled to at least one output rectifier and characterized by leakage inductance with the full-bridge dc/dc converter controlled by a phase-shifted pulse-width modulator, the improvement comprising, an external commutating inductor connected to said transformer at a junction and characterized by commutating inductance significantly larger than said leakage inductance in circuit arrangement for helping soft-switching of the semiconductor switching devices and reducing the ringing and overshoot across each output rectifier, and first and second clamp diodes connected respectively from said first and second power-supply rails to said junction coupled to said converter, for reducing said switching losses of said semiconductor switching devices and for reducing the reverse-voltage ringing and overshoot across each output rectifier.
Claim 2
Dependent Claim
142 words
In a phase-shifted pulse-width-modulated soft-switching full-bridge dc/dc converter having first and second power-supply rails intercoupled by semiconductor switching devices characterized by switching losses and exchanging energy through a transformer coupled to at least one output rectifier and characterized by leakage inductance with the full-bridge dc/dc converter controlled by a phase-shifted pulse-width modulator, the improvement comprising, an external commutating inductor connected to said transformer at a junction and characterized by commutating inductance significantly larger than said leakage inductance in circuit arrangement for helping soft-switching of the semiconductor switching devices and reducing the ringing and overshoot across each output rectifier, and first and second clamp diodes connected respectively from said first and second power-supply rails to said junction coupled to said converter, for reducing said switching losses of said semiconductor switching devices and for reducing the reverse-voltage ringing and overshoot across each output rectifier.
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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) | 1996-03-29 | 1996-09-28 | 1997-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-29 | 2000-09-28 | 2001-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-29 | 2004-09-28 | 2005-03-30 | $7700.00 | Window Closed / Lapsed |