Patent US6794977B2 successfully refreshed from Google Patents.
US6794977B2
Expired / Lapsed
US
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Planar transformers
Assignee: Beijing Xiaomi Mobile Software Co Ltd
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Filing: 2001-10-15
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Granted: 2004-09-21
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Expires: 2021-10-15
Abstract
Abstract In a planar transformer, at least a portion of each of the windings are intermingled in an intermingled portion. Within the intermingled portion, each full turn of each winding is effected by one self-crossing and two crossings of each other winding having turns in said intermingled portion. The windings may be formed in the conductor layers of an integrated circuit.
Inventors
- 👤 Kaare Tais Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:43
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/288; H01F27/2885; H01F17/00; H01F17/0006; H01F17/0013; H01F19/00; H01F19/04; H01F27/2804; H01F27/2819; H01F27/34; H01F27/36; H01F27/363; H10; H10D; H10D84/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
108 words
A substantially planar transformer comprising: a plurality of windings and having an intermingled portion in which at least a portion of a first winding is intermingled with at least a portion of at least a second winding, wherein each full turn of each winding in said intermingled portion is effected by one crossing of said each winding over said each winding and two crossings of said each winding over each of the other windings having turns in said intermingled portion, and wherein said transformer is included in an integrated circuit which includes a ground shield having a plurality of substantially radially extending fingers connected by a broken ring.
Claim 2
Dependent Claim
108 words
A substantially planar transformer comprising: a plurality of windings and having an intermingled portion in which at least a portion of a first winding is intermingled with at least a portion of at least a second winding, wherein each full turn of each winding in said intermingled portion is effected by one crossing of said each winding over said each winding and two crossings of said each winding over each of the other windings having turns in said intermingled portion, and wherein said transformer is included in an integrated circuit which includes a ground shield having a plurality of substantially radially extending fingers connected by a broken ring.
Claim 3
Dependent Claim
34 words
A transformer according to claim 1 , having a first winding and a second winding, both windings having the same number of turns, wherein the intermingled region comprises substantially the whole of both windings.
Claim 4
Dependent Claim
43 words
A transformer according claim 1 , having a first winding and a second winding, the first winding having a greater number of turns than the second winding, wherein at least one of the excess turns of the first winding encompasses the intermingled region.
Claim 5
Dependent Claim
45 words
A transformer according claim 1 , having a first winding and a second winding, the first winding having a greater number of turns than the second winding, wherein at least one of the excess turns of the first winding is encompassed by the intermingled region.
Claim 6
Dependent Claim
13 words
A transformer according to claim 1 , having first, second and third windings.
Claim 7
Dependent Claim
20 words
A transformer according to claim 5 , having an intermingled region including turns of said first, second and third windings.
Claim 8
Dependent Claim
24 words
A transformer circuit according to claim 1 , wherein the transformer has an intermingled region including turns of said first, second and third windings.
Claim 9
Dependent Claim
32 words
A transformer circuit according to claim 1 , wherein the turns of said transformer are formed from a plurality of stacked conductive paths, the paths forming each winding being united by vias.
Claim 10
Dependent Claim
37 words
A transformer circuit according to claim 8 , wherein at least one of said crossings comprises first and second bridges between radially separated conductors, the bridges being between conductive paths in respective layers and crossing each other.
Claim 11
Dependent Claim
31 words
A transformer circuit according to claim 9 , wherein the first bridge is narrower than the second bridge and the first bridge and the second bridge have substantially the same resistance.
Claim 12
Dependent Claim
52 words
A transformer according to claim 9 , wherein, at said at least one of said crossings, the conductors in a layer which are not connected to a bridge also in that layer are chamfered to provide a terminal edge lying parallel to a side edge of the bridge in the same layer.
Claim 13
Dependent Claim
16 words
A transformer according to claim 8 , wherein uniting vias are located adjacent to said crossings.
Claim 14
Dependent Claim
19 words
A transformer according to claim 9 , including a lower conductor layer forming a capacitive shield at said crossings.
Claim 15
Dependent Claim
31 words
A transformer according to claim 13 , wherein said lower conductor layer does not contain any bridges and comprises two opposed pairs of parallel fingers terminating close together under each crossing.
Claim 16
Dependent Claim
40 words
A transformer according to claim 1 , wherein the broken ring is located inwards from the outer periphery of the ground shield such that the transformer's magnetic field is substantially parallel to the integrated circuit's surface at the broken ring.
References Cited (Backward Citations)
US4816784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-09-21 | 2008-03-22 | 2008-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-09-21 | 2012-03-22 | 2012-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-09-21 | 2016-03-22 | 2016-09-21 | $7700.00 | Window Closed / Lapsed |