US4713723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolation transformer
Assignee: TDY Industries LLC
•
Filing: 1986-07-01
•
Granted: 1987-12-15
•
Expires: 2006-07-01
Abstract
Abstract An isolation transformer is provided by a primary conductor formed on an insulating layer above a secondary conductor formed on a chip therebelow, with flux lines coupling between the primary and secondary conductors to provide transformer action through the insulating layer therebetween. The primary is formed by a serpentine pattern having a plurality of parallel strips transverse to a plurality of parallel strips forming the secondary conductor. The secondary conductor may be formed on an extra insulating layer on the chip substrate.
Inventors
- 👤 Lance R. Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:50
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/722; H03K17/723; H01; H01F; H01F27/00; H01F27/28; H01F27/2804; H01F38/00; H01F38/50; H01F17/00; H01F17/0006; H01F2017/0086
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
In combination with a semiconductor switch integrated on a semiconductor substrate and having a pair of main terminals and having a gate terminal gating said switch into conduction to conduct current between said main terminals when a gating signal is applied to said gate terminal, an isolation transformer comprising: first electrically insulating layer means formed on the top of said substrate; a transformer secondary conductor formed on the top of said first electrically insulating layer means and connected at one end to said gate terminal and at the other end to one of said main terminals; second electrically insulating layer means formed on said first electrically insulating layer means over said secondary conductor; a transformer primary conductor formed on said second insulating layer means proximate said secondary conductor, such that current flow through said primary conductor induces current in said secondary conductor to provide said gating signal, wherein flux lines couple between said primary and secondary conductors to provide transformer action through said second insulating layer means therebetween.
Claim 2
Dependent Claim
168 words
In combination with a semiconductor switch integrated on a semiconductor substrate and having a pair of main terminals and having a gate terminal gating said switch into conduction to conduct current between said main terminals when a gating signal is applied to said gate terminal, an isolation transformer comprising: first electrically insulating layer means formed on the top of said substrate; a transformer secondary conductor formed on the top of said first electrically insulating layer means and connected at one end to said gate terminal and at the other end to one of said main terminals; second electrically insulating layer means formed on said first electrically insulating layer means over said secondary conductor; a transformer primary conductor formed on said second insulating layer means proximate said secondary conductor, such that current flow through said primary conductor induces current in said secondary conductor to provide said gating signal, wherein flux lines couple between said primary and secondary conductors to provide transformer action through said second insulating layer means therebetween.
Claim 3
Dependent Claim
20 words
The invention according to claim 1 wherein said semiconductor switch and said primary and secondary conductors are substantially vertically aligned.
Claim 4
Dependent Claim
52 words
The invention according to claim 1 wherein said one end of said secondary conductor extends downwardly through said first electrically insulating layer means to said gate terminal, and wherein said other end of said secondary conductor extends downwardly through said first electrically insulating layer means to said one of said main terminals.
Claim 5
Dependent Claim
33 words
The invention according to claim 1 wherein each of said primary and secondary conductors is formed by a serpentine pattern having a plurality of parallel strips joined at their ends by U-shaped portions.
Claim 6
Dependent Claim
28 words
The invention according to claim 4 wherein said plurality of parallel strips of said primary conductor are transverse to said plurality of parallel strips of said secondary conductor.
References Cited (Backward Citations)
US3953816A
Cited
US3900770A
Cited
US3958075A
Cited
US4021728A
Cited
US4156148A
Cited
DE2840514A1
Cited
US4394530A
Cited
US4196411A
Cited
US4266140A
Cited
US4250481A
Cited
US4257091A
Cited
US4218724A
Cited
US4215235A
Cited
JPS5612598A
Cited
US4425511A
Cited
US4449165A
Cited
US4488202A
Cited
US4498120A
Cited
US4449292A
Cited
US4574162A
Cited
US4546410A
Cited
US4546411A
Cited
US4554613A
Cited
US4577387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |