US5694030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic element for power supply and DC-to-DC converter
Assignee: Toshiba Corp
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Filing: 1996-09-16
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Granted: 1997-12-02
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Expires: 2016-09-16
Abstract
Abstract Disclosed is a dc-to-dc converter comprising a switching transistor, a pulse-width modulation controller, a sandwich-type planar inductor, which accumulates an electromagnetic energy at ON state and releases the accumulated electromagnetic energy at OFF state of the switching transistor, a smoothing capacitor, a rectifying element, and a planar search coil for detecting an overcurrent flowing the planar coil, disposed on one of the outer surfaces of the soft magnetic layers constituting the planar inductor.
Inventors
- 👤 Toshiro Sato
- 👤 Kunio Matsukura
- 👤 Isamu Yanase
- 👤 Yuji Iseki
- 👤 Tetsuhiko Mizoguchi
- 👤 Yuji Ide
- 👤 Michio Hasegawa
- 👤 Yoshihiko Yamaguchi
- 👤 Yasunori Iwamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:24
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/0006; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/575; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H01F2017/0066; H01F2017/0086; H02M1/00; H02M1/0003; H02M1/0009
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
A magnetic element for use in a power supply, comprising: a planar inductor comprising a planar coil, insulating layers disposed on opposed surfaces of the planar coil and soft magnetic layers disposed on outer surfaces of the insulating layers; and auxiliary planar coils disposed on outer surfaces of said soft magnetic layers, wherein said auxiliary planar coils generate a magnetic field so as to reduce a dc magnetic field generated by a dc current flowing through said planar coil.
Claim 2
Dependent Claim
79 words
A magnetic element for use in a power supply, comprising: a planar inductor comprising a planar coil, insulating layers disposed on opposed surfaces of the planar coil and soft magnetic layers disposed on outer surfaces of the insulating layers; and auxiliary planar coils disposed on outer surfaces of said soft magnetic layers, wherein said auxiliary planar coils generate a magnetic field so as to reduce a dc magnetic field generated by a dc current flowing through said planar coil.
Claim 3
Dependent Claim
29 words
The magnetic element according to claim 1, wherein a dc current flowing through the auxiliary planar coils is substantially proportional to a dc current flowing through said planar coil.
Claim 4
Dependent Claim
107 words
A magnetic element for use in a power supply, comprising: a planar transformer comprising a planar primary coil and a planar secondary coil provided with coil insulating layers disposed on the surfaces of the planar primary and secondary coils, an insulating layer separating the planar primary and secondary coils, and soft magnetic layers disposed on the outer surfaces of the coil insulating layers; and auxiliary planar coils disposed on the outer surfaces of said soft magnetic layers, wherein said auxiliary planar coils generate a magnetic field so as to reduce a dc magnetic field generated by a dc current flowing through said planar primary and secondary coils.
Claim 5
Dependent Claim
107 words
A magnetic element for use in a power supply, comprising: a planar transformer comprising a planar primary coil and a planar secondary coil provided with coil insulating layers disposed on the surfaces of the planar primary and secondary coils, an insulating layer separating the planar primary and secondary coils, and soft magnetic layers disposed on the outer surfaces of the coil insulating layers; and auxiliary planar coils disposed on the outer surfaces of said soft magnetic layers, wherein said auxiliary planar coils generate a magnetic field so as to reduce a dc magnetic field generated by a dc current flowing through said planar primary and secondary coils.
Claim 6
Dependent Claim
32 words
The magnetic element according to claim 3, wherein a dc current flowing through the auxiliary planar coils is substantially proportional to a dc current flowing through said planar primary and secondary coils.
Claim 7
Dependent Claim
150 words
A dc-to-dc converter comprising: a switching means for generating a rectangular wave from an input signal; a means for modulating a pulse width of the rectangular wave generated by the switching means; a planar inductor comprising a planar coil, insulating layers disposed on opposed surfaces of the planar coil and soft magnetic layers disposed on outer surfaces of the insulating layers, said planar coil coupled to said switching means and accumulating electromagnetic energy during a switching ON state and releasing accumulated electromagnetic energy during a switching OFF state of the switching means, a capacitor for smoothing the wave generated by the switching means; a rectifying element; and auxiliary planar coils disposed on outer surfaces of said soft magnetic layers constituting said planar inductor, wherein said auxiliary planar coils generate a magnetic field so as to reduce a dc magnetic field generated by a dc current flowing through said planar coil.
Claim 8
Dependent Claim
150 words
A dc-to-dc converter comprising: a switching means for generating a rectangular wave from an input signal; a means for modulating a pulse width of the rectangular wave generated by the switching means; a planar inductor comprising a planar coil, insulating layers disposed on opposed surfaces of the planar coil and soft magnetic layers disposed on outer surfaces of the insulating layers, said planar coil coupled to said switching means and accumulating electromagnetic energy during a switching ON state and releasing accumulated electromagnetic energy during a switching OFF state of the switching means, a capacitor for smoothing the wave generated by the switching means; a rectifying element; and auxiliary planar coils disposed on outer surfaces of said soft magnetic layers constituting said planar inductor, wherein said auxiliary planar coils generate a magnetic field so as to reduce a dc magnetic field generated by a dc current flowing through said planar coil.
Claim 9
Dependent Claim
29 words
The dc-to-dc converter according to claim 5, wherein a dc current flowing through the auxiliary planar coils is substantially proportional to a dc current flowing through said planar coil.
Claim 10
Dependent Claim
186 words
A dc-to-dc converter comprising: a switching means for generating a rectangular wave from an input signal; a means for modulating a pulse width of the rectangular wave generated by the switching means; a planar transformer comprising a planar primary coil and a planar secondary coil provided with coil insulating layers disposed on surfaces of the planar primary and secondary coils, an insulating layer separating the planar primary and secondary coils, and soft magnetic layers disposed on outer surfaces of the coil insulating layers, said planar transformer coupled to said switching means and accumulating electromagnetic energy in the planar primary coil during a switching ON state and releasing the accumulated electromagnetic energy via the planar secondary coil during a switching OFF state of the switching means; a capacitor for smoothing the wave generated by the switching means; a rectifying element; and auxiliary planar coils disposed on outer surfaces of said soft magnetic layers constituting said planar transformer, wherein said auxiliary planar coils generate a magnetic field so as to reduce a dc magnetic field generated by a dc current flowing through said planar primary and secondary coils.
Claim 11
Dependent Claim
186 words
A dc-to-dc converter comprising: a switching means for generating a rectangular wave from an input signal; a means for modulating a pulse width of the rectangular wave generated by the switching means; a planar transformer comprising a planar primary coil and a planar secondary coil provided with coil insulating layers disposed on surfaces of the planar primary and secondary coils, an insulating layer separating the planar primary and secondary coils, and soft magnetic layers disposed on outer surfaces of the coil insulating layers, said planar transformer coupled to said switching means and accumulating electromagnetic energy in the planar primary coil during a switching ON state and releasing the accumulated electromagnetic energy via the planar secondary coil during a switching OFF state of the switching means; a capacitor for smoothing the wave generated by the switching means; a rectifying element; and auxiliary planar coils disposed on outer surfaces of said soft magnetic layers constituting said planar transformer, wherein said auxiliary planar coils generate a magnetic field so as to reduce a dc magnetic field generated by a dc current flowing through said planar primary and secondary coils.
Claim 12
Dependent Claim
32 words
The dc-to-dc converter according to claim 7, wherein a dc current flowing through the auxiliary planar coils is substantially proportional to a dc current flowing through said planar primary and secondary coils.
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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) | 2000-12-01 | 2001-06-02 | 2001-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-01 | 2005-06-02 | 2005-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-01 | 2009-06-02 | 2009-12-02 | $7700.00 | Window Closed / Lapsed |