Patent US5661646A successfully refreshed from Google Patents.
US5661646A
Expired / Lapsed
US
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Multi-phase DC-DC chopper with different number of phases
Assignee: BWX Technologies Inc
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Filing: 1996-09-25
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Granted: 1997-08-26
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Expires: 2016-09-25
Abstract
Abstract A multi-phase DC chopper circuit having a different number of phases on each side of the current source. The ciruit utilizes fewer chopper phases and produces more discrete DC voltage steps.
Inventors
- 👤 Xianrui Huang
- 👤 Minfeng Xu
- 👤 Paulo F. Ribeiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:15
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/158; H02M3/1584; H02M3/125; H02M3/135; H02M3/137; H02M3/142
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A multiphase DC chopper circuit comprising: a voltage source having a positive and a negative terminal; a first plurality of chopper phases connected in parallel between the positive terminal and the negative terminal; a second plurality of chopper phases connected in parallel between the positive terminal and the negative terminal, there being more chopper phases in the second plurality than the first plurality; and a current source connected between the first plurality of chopper phases and the second plurality of chopper phases.
Claim 2
Dependent Claim
82 words
A multiphase DC chopper circuit comprising: a voltage source having a positive and a negative terminal; a first plurality of chopper phases connected in parallel between the positive terminal and the negative terminal; a second plurality of chopper phases connected in parallel between the positive terminal and the negative terminal, there being more chopper phases in the second plurality than the first plurality; and a current source connected between the first plurality of chopper phases and the second plurality of chopper phases.
Claim 3
Dependent Claim
55 words
A circuit according to claim 1, wherein each of the chopper phases comprises: a pair of semiconductor switches, each having a forward direction terminal and a reverse direction terminal, the switches connected in series and having their like terminals connected together at a node; and an inductor connected between the node and the current source.
Claim 4
Dependent Claim
29 words
A circuit according to claim 2, wherein the semiconductor switches comprise one of insulated gate bipolar transistors, gate turn-off switches, metal-oxide semiconductor controlled thyristors or metal-oxide semiconductor turn-off switches.
Claim 5
Dependent Claim
15 words
A circuit according to claim 3, wherein the semiconductor switches are insulated gate bipolar transistors.
Claim 6
Dependent Claim
15 words
A circuit according to claim 3, wherein the semiconductor switches are gate turn off switches.
Claim 7
Dependent Claim
15 words
A circuit according to claim 3, wherein the semiconductor switches are metal-oxide semiconductor controlled thyristors.
Claim 8
Dependent Claim
15 words
A circuit according to claim 3, wherein the semiconductor switches are metal-oxide semiconductor turnoff switches.
Claim 9
Dependent Claim
24 words
A circuit according to claim 3, wherein the second plurality of phases comprises at least one more phase than the first plurality of phases.
Claim 10
Dependent Claim
24 words
A circuit according to claim 2, wherein the second plurality of phases comprises at least one more phase than the first plurality of phases.
References Cited (Backward Citations)
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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) | 2000-08-25 | 2001-02-24 | 2001-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-25 | 2005-02-24 | 2005-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-25 | 2009-02-24 | 2009-08-26 | $7700.00 | Window Closed / Lapsed |