Patent US2805766A successfully refreshed from Google Patents.
US6522108B2
Expired / Lapsed
US
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Loss and noise reduction in power converters
Assignee: Vicor Corp
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Filing: 2001-04-13
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Granted: 2003-02-18
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Expires: 2021-04-13
Abstract
Abstract An apparatus includes (a) switching power conversion circuitry including an inductive element connected to deliver energy via a unidirectional conducting device from an input source to a load during a succession of power conversion cycles, and circuit capacitance that can resonate with the inductive element during a portion of the power conversion cycles to cause a parasitic oscillation, and (b) clamp circuitry connected to trap energy in the inductive element and reduce the parasitic oscillation.
Inventors
- 👤 Jay Prager
- 👤 Patrizio Vinciarelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:55
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/32; H02M1/34; H02M3/00; H02M3/01; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33569; H02M3/33576; H02M1/342; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
89 words
Apparatus comprising switching power conversion apparatus for converting power from an input source for delivery to a load comprising an inductive element connected to deliver energy via a unidirectional conducting device from said input source to said load during a succession of power conversion cycles, circuit capacitance which can resonate with said inductive element during a portion of said power conversion cycle to cause a parasitic oscillation unrelated to the power conversion process, and clamp circuitry configured to trap energy in the inductive element and prevent said parasitic oscillation.
Claim 2
Dependent Claim
89 words
Apparatus comprising switching power conversion apparatus for converting power from an input source for delivery to a load comprising an inductive element connected to deliver energy via a unidirectional conducting device from said input source to said load during a succession of power conversion cycles, circuit capacitance which can resonate with said inductive element during a portion of said power conversion cycle to cause a parasitic oscillation unrelated to the power conversion process, and clamp circuitry configured to trap energy in the inductive element and prevent said parasitic oscillation.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 wherein said power conversion apparatus is a unipolar, non-isolated boost converter comprising a shunt switch.
Claim 4
Dependent Claim
23 words
The apparatus of claim 2 in which the shunt switch is controlled to cause the power conversion to occur in a discontinuous mode.
Claim 5
Dependent Claim
26 words
The apparatus of claim 1 in which the clamp circuitry is configured to trap the energy in the inductor in a manner that is essentially non-dissipative.
Claim 6
Dependent Claim
26 words
The apparatus of claim 1 in which the clamp circuitry comprises elements configured to trap the energy by short-circuiting the inductor during a controlled time period.
Claim 7
Dependent Claim
13 words
The apparatus of claim 1 in which the inductive element comprises a choke.
Claim 8
Dependent Claim
13 words
The apparatus of claim 1 in which the inductive element comprises a transformer.
Claim 9
Dependent Claim
20 words
The apparatus of claim 5 in which the elements comprise a second switch connected effectively in parallel with the inductor.
Claim 10
Dependent Claim
18 words
The apparatus of claim 8 in which the second switch is connected directly in parallel with the inductor.
Claim 11
Dependent Claim
18 words
The apparatus of claim 8 in which the second switch is inductively coupled in parallel with the inductor.
Claim 12
Dependent Claim
20 words
The apparatus of claim 8 in which the second switch comprises a field effect transistor in series with a diode.
Claim 13
Dependent Claim
53 words
The apparatus of claim 8 wherein said power conversion apparatus is a unipolar, non-isolated boost converter comprising a shunt switch and a switch controller, said switch controller controlling the timing of a power delivery period during which said shunt switch is open and a shunt period during which said shunt switch is closed.
Claim 14
Dependent Claim
23 words
The apparatus of claim 12 in which the shunt switch is controlled to cause the power conversion to occur in a discontinuous mode.
Claim 15
Dependent Claim
30 words
The apparatus of claim 12 in which the second switch is opened for a period before the shunt switch is closed in order to discharge parasitic capacitances in the apparatus.
Claim 16
Dependent Claim
17 words
The apparatus of claim 1 wherein said power conversion apparatus is a unipolar, isolated, single-ended forward converter.
Claim 17
Dependent Claim
14 words
The apparatus of claim 15 wherein said power conversion apparatus is a buck converter.
Claim 18
Dependent Claim
14 words
The apparatus of claim 15 wherein said power conversion apparatus is a flyback converter.
Claim 19
Dependent Claim
15 words
The apparatus of claim 15 wherein said single-ended forward converter is a zero-current switching converter.
Claim 20
Dependent Claim
14 words
The apparatus of claim 15 wherein said single-ended forward converter is a PWM converter.
Claim 21
Dependent Claim
16 words
The apparatus of claim 1 wherein said power conversion apparatus is a bipolar, non-isolated, boost converter.
Claim 22
Dependent Claim
16 words
The apparatus of claim 1 wherein said power conversion apparatus is a bipolar, non-isolated boost converter.
Claim 23
Dependent Claim
16 words
The apparatus of claim 1 wherein said power conversion apparatus is a bipolar, non-isolated buck converter.
Claim 24
Dependent Claim
16 words
The apparatus of claim 1 wherein said power conversion apparatus is a bipolar, isolated boost converter.
Claim 25
Dependent Claim
16 words
The apparatus of claim 1 wherein said power conversion apparatus is a bipolar, isolated buck converter.
Claim 26
Dependent Claim
101 words
In a power converter which converts power from an input source for delivery to a load during a succession of power conversion cycles and which comprises an inductive element connected to deliver power via a unidirectional conducting device from said input source to said load and a circuit capacitance which can resonate with said inductive element during a portion of said power conversion cycle to cause a parasitic oscillation unrelated to the power conversion process, a method for preventing said parasitic oscillations comprising providing clamp circuitry for trapping energy in the inductive element during a portion of the power conversion cycle.
Claim 27
Dependent Claim
101 words
In a power converter which converts power from an input source for delivery to a load during a succession of power conversion cycles and which comprises an inductive element connected to deliver power via a unidirectional conducting device from said input source to said load and a circuit capacitance which can resonate with said inductive element during a portion of said power conversion cycle to cause a parasitic oscillation unrelated to the power conversion process, a method for preventing said parasitic oscillations comprising providing clamp circuitry for trapping energy in the inductive element during a portion of the power conversion cycle.
Claim 28
Dependent Claim
15 words
The method of claim 25 also including releasing the energy from the inductor essentially non-dissipatively.
Claim 29
Dependent Claim
20 words
The method of claim 17 wherein the trapping of energy comprises short-circuiting the inductive element during a controlled time period.
Claim 30
Dependent Claim
23 words
The method of claim 27 in which the short-circuiting is done by a second switch connected effectively in parallel with the inductive element.
Claim 31
Dependent Claim
25 words
The apparatus of claim 28 also including opening the second switch for a portion of the power conversion cycle in order to discharge parasitic capacitances.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2006-02-17 | 2006-08-19 | 2007-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-02-17 | 2010-08-19 | 2011-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-02-17 | 2014-08-19 | 2015-02-18 | $7700.00 | Window Closed / Lapsed |