CN102360796A - Integrated transformer - Google Patents

Integrated transformer Download PDF

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Publication number
CN102360796A
CN102360796A CN2011102049199A CN201110204919A CN102360796A CN 102360796 A CN102360796 A CN 102360796A CN 2011102049199 A CN2011102049199 A CN 2011102049199A CN 201110204919 A CN201110204919 A CN 201110204919A CN 102360796 A CN102360796 A CN 102360796A
Authority
CN
China
Prior art keywords
conductor layer
lead
connecting hole
conductor
layer lead
Prior art date
Application number
CN2011102049199A
Other languages
Chinese (zh)
Inventor
方健
杨毓俊
黎俐
唐莉芳
王泽华
柏文斌
陈吕赟
吴琼乐
管超
李曼
梁晨陇
Original Assignee
电子科技大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 电子科技大学 filed Critical 电子科技大学
Priority to CN2011102049199A priority Critical patent/CN102360796A/en
Publication of CN102360796A publication Critical patent/CN102360796A/en

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001Technical content checked by a classifier
    • H01L2924/0002Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

The invention discloses an integrated transformer, comprising a primary coil and a secondary coil, wherein the primary coil and the secondary coil comprise at least one first conductor layer conducting wire, at least one second conductor layer conducting wire and at least one connecting hole. In the invention, a hollow cross coupling coil composed of two adjacent conductor layers is used for forming the integrated transformer, and projections of middle points of all the conducting wires of the first conductor layer and the second conductor layer of the primary coil and the secondary coil of the integrated transformer on any conductor layer plane are on the same straight line, thus a window face of a magnetic core can be vertical to the conductor layer plane, thickness of an insulated layer between two conductor layers is used as width of the window face of the magnetic core, and occupied conductor layer area is reduced.

Description

A kind of integrated transformer

Technical field

The present invention relates to the power transformer of the small-sized integrated signal in the electronic technology field, the integrated transformer that the hollow mutual coupling coil that is specifically related to utilize adjacent two-layer conductor to constitute forms.

Background technology

Integrated transformer is the mutual coupling coil that is integrated in chip internal.Its effect is similar with common external transformer, mainly is to be used for isolating input and output signal or to transmit less energy.

Transformer is integrated on the chip, adds the auxiliary of some coder and decoder ics, can substitute traditional bigger isolation signals transmitting elements of volume such as optocoupler, thereby reduce the volume and the cost of integrated circuit.At present, be that the magnetic coupling isolator of core all is superior to optocoupler at aspects such as volume, power consumption and speed with the integrated transformer.

Integrated transformer can also be used to transmit micropower, makes isolating switch power in the sheet.Though this integrated power supply can't reach the level of external power source on technical indicators such as ripple amplitude, adjusting range, rated power and power consumption; But, it have design objective flexible, with low cost, can be integrated etc. the incomparable advantage of external power source.

Therefore, integrated transformer can become a kind of trend of following transformer development.

At present, main integrated transformer structure is a plane formula.Promptly the form with helix is made coil on every layer of conductor, the center alignment of two-layer helix, i.e. and transformer device structure is as shown in Figure 1 the most intuitively in formation.In the iCoupler of ADI company technology, used this transformer device structure, its main use is that magnetic is isolated analog signal through high frequency modulated of transmission, to realize the effect of input/output signal dc-isolation.This integrated transformer coupling coefficient is high, and the electric capacity between coil inductance and the coil is controlled easily.But; The transformer of this structure has two each and every one bigger shortcomings: the first, because the magnetic core window area has directly taken the conductor layer area; And enclose the restriction that the snail cabling also receives the minimum feature and the number of turn, so total conductor layer area that this structure takies is very big more; The second, for elementary or secondary monolateral coil, the port of helical coil inboard is drawn needs to cross over a layer insulating to another layer metal, also promptly needs take layer of metal more, and elementary secondary bilateral coil then needs take double layer of metal more.Above-mentioned shortcoming is unfavorable for the raising of performance of integrated circuits and the reduction of cost.

Summary of the invention

The objective of the invention is to have proposed a kind of integrated transformer in order to solve the above-mentioned shortcoming of existing integrated transformer.

Technical scheme of the present invention is: a kind of integrated transformer comprises primary coil and secondary coil: said primary coil comprises at least one first conductor layer lead, at least one the second conductor layer lead and at least one connecting hole; The said first conductor layer lead is connected through a connecting hole with the end points place of the second conductor layer lead at lead; Each first conductor layer lead minimum with one, be connected through connecting hole with two second conductor layer leads at most, each second conductor layer lead minimum with one, be connected through connecting hole with two first conductor layer leads at most; Has only a connecting hole between the first adjacent conductor layer lead and the second conductor layer lead;

Said secondary coil comprises at least one first conductor layer lead, at least one the second conductor layer lead and at least one connecting hole; The said first conductor layer lead is connected through a connecting hole with the end points place of the second conductor layer lead at lead; Each first conductor layer lead minimum with one, be connected through connecting hole with two second conductor layer leads at most, each second conductor layer lead minimum with one, be connected through connecting hole with two first conductor layer leads at most; Has only a connecting hole between the first adjacent conductor layer lead and the second conductor layer lead;

The said first conductor layer lead is positioned on first conductor layer, and the said second conductor layer lead is positioned on second conductor layer, and said first conductor layer is parallel with said second conductor layer; All first conductor layer conductor lengths of said primary coil and secondary coil are equal, parallel and not do not overlap; All second conductor layer conductor lengths of said primary coil and secondary coil are equal, parallel and not do not overlap.The projection of the mid point of all leads of said first conductor layer and second conductor layer on any conductor layer plane point-blank.

Said connecting hole is made up of one or more adjacent through holes.

Said conductor is a metal.

Beneficial effect of the present invention: the hollow mutual coupling coil that the present invention utilizes adjacent two-layer conductor to constitute forms integrated transformer; The projection of the mid point of first conductor layer of the primary coil of described integrated transformer and secondary coil and all leads of second conductor layer on any conductor layer plane point-blank; Therefore can make the magnetic core window face vertical with the conductor layer plane; And utilized the thickness of insulating layer between two-layer conductor layer; As the width of magnetic core window actinal surface, reduced the conductor layer area that takies, also promptly reduced total chip area.The primary coil port of integrated transformer and secondary coil port also all can directly be drawn from first conductor layer or second conductor layer, need not expend extra conductor layer and go between, and have reduced cost.

Description of drawings

Fig. 1 is a planar structure transformer device structure sketch map.

Fig. 2 is the integrated transformer structure perspective view of the embodiment of the invention one.

Fig. 3 is the integrated transformer structure perspective view of the embodiment of the invention two.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the present invention is done further explanation.

Integrated transformer of the present invention comprises primary coil and secondary coil: said primary coil comprises at least one first conductor layer lead, at least one the second conductor layer lead and at least one connecting hole; The said first conductor layer lead is connected through a connecting hole with the end points place of the second conductor layer lead at lead; Each first conductor layer lead minimum with one, be connected through connecting hole with two second conductor layer leads at most, each second conductor layer lead minimum with one, be connected through connecting hole with two first conductor layer leads at most; Has only a connecting hole between the first adjacent conductor layer lead and the second conductor layer lead.

Said secondary coil comprises at least one first conductor layer lead, at least one the second conductor layer lead and at least one connecting hole; The said first conductor layer lead is connected through a connecting hole with the end points place of the second conductor layer lead at lead; Each first conductor layer lead minimum with one, be connected through connecting hole with two second conductor layer leads at most, each second conductor layer lead minimum with one, be connected through connecting hole with two first conductor layer leads at most; Has only a connecting hole between the first adjacent conductor layer lead and the second conductor layer lead.

The said first conductor layer lead is positioned on first conductor layer, and the said second conductor layer lead is positioned on second conductor layer, and said first conductor layer is parallel with said second conductor layer; All first conductor layer conductor lengths of said primary coil and secondary coil are equal, parallel and not do not overlap; All second conductor layer conductor lengths of said primary coil and secondary coil are equal, parallel and not do not overlap.The projection of the mid point of all leads of said first conductor layer and second conductor layer on any conductor layer plane point-blank.Here, the width to the conductor layer lead does not limit, though parallel between the conductor layer lead, the part of overlapping might be arranged, require in the present invention not overlap between the conductor layer lead.

Here, connecting hole is made up of one or more adjacent through holes, and through hole is used for connecting the first conductor layer lead and the second conductor layer lead; In technology is made; The size of through hole is certain, in some occasion, needs to increase current capacity; Just need a plurality of through holes to constitute a connecting hole, " adjacent " here is meant the size arrangement of through hole with technological requirement.

Described conductor is a metal.Can find out, not link to each other between primary coil and the secondary coil here through any conductor layer or connecting hole.

Specify through two embodiment below.

Embodiment one: integrated transformer structure perspective view is as shown in Figure 2, and the integrated transformer structure that is specially space multistory projects on any plane parallel with two-layer conductor layer.Conductor lines between A, the C two-port constitutes primary coil, and the conductor lines between B, the D two-port constitutes secondary coil.Primary coil begins from the A point; On first conductor layer, make a wide conductor lines to the E point; AE has constituted one first conductor layer lead of primary coil, the peak current value decision that the AE width is flow through by transformer coil, and AE length is by the required magnetic core window size decision of transformer.Be connected to second conductor layer at the connecting hole of E point through separator; On second conductor layer, make a wide conductor lines again to the F point; The F point does not overlap with the A point, the peak current value decision that the EF width is flow through by transformer coil, and EF length is by the required magnetic core window size decision of transformer; Be connected to first conductor layer at the connecting hole of F point through separator again, just formed a circle coil.The back and the like to the required number of turn, the connecting hole here is made up of a through hole, monolateral coil projects to and is projected as the sawtooth waveforms shape on the metal flat.The structure of secondary coil is identical with primary coil, and the secondary coil magnetic core window is alignd with primary coil.The secondary coil number of turn is confirmed by institute's design transformer demand.

Embodiment two: integrated transformer structure perspective view is as shown in Figure 3, and the integrated transformer structure that is specially space multistory projects on any plane parallel with two-layer conductor layer.Conductor lines between A, the C two-port constitutes primary coil, and the conductor lines between B, the D two-port constitutes secondary coil.Primary coil begins from the A point; On first conductor layer, make a wide conductor lines to the E point; AE has constituted one first conductor layer lead of primary coil, the peak current value decision that the AE width is flow through by transformer coil, and AE length is by the required magnetic core window size decision of transformer.Be connected to second conductor layer at the connecting hole of E point through separator; On second conductor layer, make a wide conductor lines again to the F point; The F point does not overlap with the A point, the peak current value decision that the EF width is flow through by transformer coil, and EF length is by the required magnetic core window size decision of transformer; Be connected to first conductor layer at the connecting hole of F point through separator again, just formed a circle coil.The back and the like to the required number of turn, the connecting hole here is made up of a through hole, monolateral coil projects to and is projected as the triangular wave shape on the metal flat.The structure of secondary coil is identical with primary coil, and the secondary coil magnetic core window is alignd with primary coil.The secondary coil number of turn is confirmed by institute's design transformer demand.

Those of ordinary skill in the art will appreciate that embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from essence of the present invention according to these teachings disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.

Claims (3)

1. an integrated transformer comprises primary coil and secondary coil, it is characterized in that, said primary coil comprises at least one first conductor layer lead, at least one the second conductor layer lead and at least one connecting hole; The said first conductor layer lead is connected through a connecting hole with the end points place of the second conductor layer lead at lead; Each first conductor layer lead minimum with one, be connected through connecting hole with two second conductor layer leads at most, each second conductor layer lead minimum with one, be connected through connecting hole with two first conductor layer leads at most; Has only a connecting hole between the first adjacent conductor layer lead and the second conductor layer lead;
Said secondary coil comprises at least one first conductor layer lead, at least one the second conductor layer lead and at least one connecting hole; The said first conductor layer lead is connected through a connecting hole with the end points place of the second conductor layer lead at lead; Each first conductor layer lead minimum with one, be connected through connecting hole with two second conductor layer leads at most, each second conductor layer lead minimum with one, be connected through connecting hole with two first conductor layer leads at most; Has only a connecting hole between the first adjacent conductor layer lead and the second conductor layer lead;
The said first conductor layer lead is positioned on first conductor layer, and the said second conductor layer lead is positioned on second conductor layer, and said first conductor layer is parallel with said second conductor layer; All first conductor layer conductor lengths of said primary coil and secondary coil are equal, parallel and not do not overlap; All second conductor layer conductor lengths of said primary coil and secondary coil are equal, parallel and do not have overlapping, and the projection of the mid point of all leads of said first conductor layer and second conductor layer on any conductor layer plane point-blank.
2. integrated transformer according to claim 1 is characterized in that, described connecting hole is made up of one or more adjacent through holes.
3. integrated transformer according to claim 1 and 2 is characterized in that, described conductor is a metal.
CN2011102049199A 2011-07-21 2011-07-21 Integrated transformer CN102360796A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011102049199A CN102360796A (en) 2011-07-21 2011-07-21 Integrated transformer

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CN2011102049199A CN102360796A (en) 2011-07-21 2011-07-21 Integrated transformer

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106935381A (en) * 2017-05-12 2017-07-07 绵阳市维博电子有限责任公司 A kind of miniature high isolation is pressure-resistant without magnetic core PCB transformers
CN108022914A (en) * 2017-11-19 2018-05-11 天津大学 A kind of Terahertz transformer realized using standard CMOS process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5126714A (en) * 1990-12-20 1992-06-30 The United States Of America As Represented By The Secretary Of The Navy Integrated circuit transformer
CN1701397A (en) * 2003-09-01 2005-11-23 株式会社村田制作所 Laminated coil component and method of producing the same
US20100176904A1 (en) * 2006-01-30 2010-07-15 Daihen Corporation Current detection printed board, voltage detection printed board, and current/voltage detector using same, and current detector and voltage detector
US20100295646A1 (en) * 2007-01-11 2010-11-25 William Lee Harrison Manufacture and use of planar embedded magnetics as discrete components and in integrated connectors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5126714A (en) * 1990-12-20 1992-06-30 The United States Of America As Represented By The Secretary Of The Navy Integrated circuit transformer
CN1701397A (en) * 2003-09-01 2005-11-23 株式会社村田制作所 Laminated coil component and method of producing the same
US20100176904A1 (en) * 2006-01-30 2010-07-15 Daihen Corporation Current detection printed board, voltage detection printed board, and current/voltage detector using same, and current detector and voltage detector
US20100295646A1 (en) * 2007-01-11 2010-11-25 William Lee Harrison Manufacture and use of planar embedded magnetics as discrete components and in integrated connectors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106935381A (en) * 2017-05-12 2017-07-07 绵阳市维博电子有限责任公司 A kind of miniature high isolation is pressure-resistant without magnetic core PCB transformers
CN106935381B (en) * 2017-05-12 2018-07-27 绵阳市维博电子有限责任公司 A kind of miniature high isolation pressure resistance is without magnetic core PCB transformers
CN108022914A (en) * 2017-11-19 2018-05-11 天津大学 A kind of Terahertz transformer realized using standard CMOS process

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Application publication date: 20120222