Patent US1938756A successfully refreshed from Google Patents.
Patent US5959438A successfully refreshed from Google Patents.
US5959438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soft-switched boost converter with isolated active snubber
Assignee: Delta Electronics Inc
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Filing: 1998-01-09
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Granted: 1999-09-28
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Expires: 2018-01-09
Abstract
Abstract A boost converter employs an isolated active snubber to reduce the losses caused by the reverse-recovery characteristic of a boost rectifier and the turn-on discharge loss of the output capacitance of the boost switch. The losses are reduced by inserting the primary winding of a coupled-inductor in the series path of the boost switch and the rectifier, to control the rate of current change (i.e., the di/dt rate) of the rectifier during its turn-off, and to create the conditions for zero-voltage turn-on for the boost switch. The energy from the inductor, after the boost-switch is turned off, is delivered to the output via the secondary winding of the coupled-inductor which is connected in series with a clamping capacitor and an auxiliary switch to form an isolated active snubber. The same technique can be extended to any member of the PWM-converter family.
Inventors
- 👤 Milan M. Jovanovic
- 👤 Yungtaek Jang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:44
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/32; H02M1/34; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/158; H02M1/342; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
115 words
A converter having an input terminal, an output terminal and a ground reference terminal, comprising: an inductor having a first terminal and a second terminal, said first terminal coupled to said input terminal; a rectifier coupled between said second terminal of said inductor and said output terminal; a first switch; a second switch; a capacitor; and a coupled-inductor having a first winding and a second winding, said first winding coupling said first switch and said rectifier in a first series connection between said ground reference terminal and said output terminal, and said second winding coupling said second switch and said capacitor in a second series connection between said ground reference terminal and said output terminal.
Claim 2
Dependent Claim
115 words
A converter having an input terminal, an output terminal and a ground reference terminal, comprising: an inductor having a first terminal and a second terminal, said first terminal coupled to said input terminal; a rectifier coupled between said second terminal of said inductor and said output terminal; a first switch; a second switch; a capacitor; and a coupled-inductor having a first winding and a second winding, said first winding coupling said first switch and said rectifier in a first series connection between said ground reference terminal and said output terminal, and said second winding coupling said second switch and said capacitor in a second series connection between said ground reference terminal and said output terminal.
Claim 3
Dependent Claim
29 words
A converter as in claim 1, wherein said first winding of said coupled-inductor is provided across said second terminal of said inductor and a terminal of said first switch.
Claim 4
Dependent Claim
25 words
A converter as in claim 1, wherein said second winding of said coupled-inductor is provided across a terminal of said capacitor and said output terminal.
Claim 5
Dependent Claim
25 words
A converter as in claim 1, wherein said first winding is provided across said second terminal of said inductor and a terminal of said rectifier.
Claim 6
Dependent Claim
17 words
A converter as in claim 1, wherein said input and output terminals are isolated by a transformer.
Claim 7
Dependent Claim
26 words
A converter as in claim 1, wherein said first and second switches, said rectifier, said inductor and said capacitor are configured in a SEPIC converter configuration.
Claim 8
Dependent Claim
27 words
A converter as in claim 1, wherein said first and second switches, said rectifier, said inductor and said capacitor are configured in a three-phase boost converter configuration.
Claim 9
Dependent Claim
16 words
A converter as in claim 1, wherein said first and second switches are not simultaneously closed.
Claim 10
Dependent Claim
23 words
A converter as in claim 1, further comprising a second rectifier coupled between said ground reference terminal and a terminal of said rectifier.
Claim 11
Dependent Claim
19 words
A converter as in claim 1 further comprising a filter capacitor across said output terminal and said ground reference.
Claim 12
Dependent Claim
50 words
A converter as in claim 1, wherein said second winding of said coupled-inductor has a first terminal and a second terminal, said first terminal of said second winding being coupled to said output terminal, and said capacitor being coupled across said second winding of said coupled-inductor and said second switch.
Claim 13
Dependent Claim
51 words
A converter as in claim 1, wherein said second winding of said coupled-inductor has a first terminal and a second terminal, said capacitor being coupled across said output terminal and said first terminal of said second winding, and said second terminal of said second winding being coupled to said second switch.
Claim 14
Dependent Claim
23 words
A converter as in claim 12, further comprising a rectifier coupled between said ground reference and said first terminal of said second winding.
Claim 15
Dependent Claim
127 words
A boost converter having an input terminal, an output terminal and a ground reference terminal, comprising: an inductor having a first terminal and a second terminal, said first terminal coupled to said input terminal; a first rectifier having an anode and a cathode, said anode coupled to said second terminal of said inductor and said cathode coupled to said output terminal; a first switch; a second switch; a capacitor; and a coupled-inductor having a first winding and a second winding, said first winding coupling said rectifier in a first series connection between said second terminal of said inductor and said output terminal, and said second winding coupling said second switch and said capacitor in a second series connection between said ground reference terminal and said output terminal.
Claim 16
Dependent Claim
127 words
A boost converter having an input terminal, an output terminal and a ground reference terminal, comprising: an inductor having a first terminal and a second terminal, said first terminal coupled to said input terminal; a first rectifier having an anode and a cathode, said anode coupled to said second terminal of said inductor and said cathode coupled to said output terminal; a first switch; a second switch; a capacitor; and a coupled-inductor having a first winding and a second winding, said first winding coupling said rectifier in a first series connection between said second terminal of said inductor and said output terminal, and said second winding coupling said second switch and said capacitor in a second series connection between said ground reference terminal and said output terminal.
Claim 17
Dependent Claim
24 words
A boost converter as in claim 14, further comprising a second rectifier coupled between said ground reference and said anode of said first rectifier.
Claim 18
Dependent Claim
19 words
A boost converter as in claim 14, wherein said boost converter is provided in a three-phase boost converter configuration.
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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) | 2002-09-27 | 2003-03-29 | 2003-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-09-27 | 2007-03-29 | 2007-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-09-27 | 2011-03-29 | 2011-09-28 | $7700.00 | Window Closed / Lapsed |