CN111430131B - Integrated transformer - Google Patents
Integrated transformer Download PDFInfo
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- CN111430131B CN111430131B CN202010407902.2A CN202010407902A CN111430131B CN 111430131 B CN111430131 B CN 111430131B CN 202010407902 A CN202010407902 A CN 202010407902A CN 111430131 B CN111430131 B CN 111430131B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
- H01F27/2828—Construction of conductive connections, of leads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
- H01F2027/2809—Printed windings on stacked layers
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Abstract
The invention provides an integrated transformer, which comprises a plurality of metal layers which are arranged in a stacked mode, wherein each metal layer is provided with a coil; each dielectric layer is positioned between two adjacent metal layers, and each dielectric layer is provided with a through hole; the input ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the input ends in the dielectric layer, and the output ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the output ends in the dielectric layer; in the invention, the dielectric layer is arranged between the metal layers, the through holes are arranged on the dielectric layer, and the coils of the metal layers are connected through the corresponding through holes, so that the metal layers can be connected only by arranging the through holes on the dielectric layer, the current circulation is realized without completely fitting the metal layers, the influence caused by the skin effect is greatly reduced, the effective cross section of each metal layer is increased, the total effective cross section of the current of the integrated transformer can be greatly increased by increasing the number of the metal layers, and the performance of the integrated transformer is effectively improved.
Description
Technical Field
The invention relates to the technical field of semiconductors, in particular to an integrated transformer.
Background
The transformer is a device for transforming voltage, current and impedance by utilizing electromagnetic mutual induction, is an important component in a radio frequency integrated circuit, and is widely used in the radio frequency integrated circuit. However, transformers often occupy a large amount of core volume, and therefore, the area of the transformer in an integrated circuit needs to be reduced.
In the prior art, in order to reduce the size of the transformer, an integrated transformer formed by laminating a plurality of metal layers is presented, and the laminated design of the plurality of metal layers reduces the size of the integrated transformer.
Most of such integrated transformers are formed by completely attaching a plurality of metal layers to each other, in the integrated transformer composed of the completely attached multiple metal layers, the multiple metal layers attached to each other are easy to form an integral body under the influence of skin effect, so that the current in the integrated transformer is concentrated on this "monolithic" surface, in other words, only the outermost surface of the plurality of metal layers is the effective cross-section for the current, this makes the effective cross-section of the current be four cross-sections, up, down, left and right, no matter how many metal layers the integrated transformer has, resulting in poor performance of the integrated transformer, even if the effective cross section can be increased by increasing the number of metal layers, the increased effective cross section is less, the effective current of the integrated transformer is insufficient, and the performance of the integrated transformer in the integrated circuit is reduced.
Disclosure of Invention
The invention aims to provide an integrated transformer to solve the technical problem that the performance of the integrated transformer in the prior art is poor.
In order to achieve the purpose, the invention adopts the technical scheme that:
an integrated transformer, comprising:
a plurality of metal layers arranged in a stacked manner, each of the metal layers being provided with a coil;
the dielectric layers are positioned between two adjacent metal layers, and each dielectric layer is provided with a through hole;
the input ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the input ends in the dielectric layer, and the output ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the output ends in the dielectric layer.
Further, the structures of the metal layers are the same.
Furthermore, the coils comprise primary coils and secondary coils, the primary coils and the secondary coils are coupled with each other, the primary coils of two adjacent metal layers are connected through corresponding through holes, and the secondary coils of two adjacent metal layers are connected through corresponding through holes.
Further, the primary coil comprises one or more sub-coils, and the secondary coil comprises one or more sub-coils.
Furthermore, each turn of sub-coil in the primary coil is connected in series or in parallel, and each turn of sub-coil in the secondary coil is connected in series or in parallel.
Further, the primary coil comprises a first sub-coil and a second sub-coil, and the secondary coil comprises a third sub-coil and a fourth sub-coil.
Further, the first sub-coil and the second sub-coil are connected in parallel, and the third sub-coil and the fourth sub-coil are connected in series.
Further, the first sub-coil and the second sub-coil are connected in series, and the third sub-coil and the fourth sub-coil are connected in parallel.
Furthermore, the first sub-coil and the second sub-coil are connected in parallel, and the third sub-coil and the fourth sub-coil are connected in parallel.
Further, the first sub-coil and the second sub-coil are connected in series, and the third sub-coil and the fourth sub-coil are connected in series.
The integrated transformer provided by the invention has the beneficial effects that: the integrated transformer comprises a plurality of metal layers which are arranged in a stacked mode, and each metal layer is provided with a coil; each dielectric layer is positioned between two adjacent metal layers, and each dielectric layer is provided with a through hole; the input ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the input ends in the dielectric layer, and the output ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the output ends in the dielectric layer; in the invention, the dielectric layer is arranged between the metal layers, the dielectric layer is provided with the through holes, and the coils of the two adjacent metal layers are connected through the corresponding through holes, so that the metal layers of the integrated transformer can be connected only by arranging the through holes on the dielectric layer, the current circulation is realized without completely fitting the metal layers, the influence caused by the skin effect is greatly reduced, each metal layer has four effective sections, namely an upper effective section, a lower effective section, a left effective section and a right effective section, the more the number of the metal layers is, the larger the effective section is, and the total effective section of the current of the integrated transformer can be greatly increased by increasing the number of the metal layers, thereby effectively improving the performance of.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of two metal layers of an integrated transformer provided in this embodiment;
FIG. 2 is a schematic cross-sectional view of a current-carrying two metal layers of a conventional integrated transformer;
fig. 3 is a schematic cross-sectional view of the integrated transformer provided in this embodiment with current flowing through two metal layers;
fig. 4 is a top view of a metal layer of the integrated transformer according to the present embodiment;
FIG. 5 is a top coil view of a metal layer of the integrated transformer according to the present embodiment;
fig. 6 is a schematic diagram of a simulation result of the integrated transformer inductor provided in this embodiment;
fig. 7 is a schematic diagram of a simulation result of the quality of the integrated transformer according to the present embodiment;
fig. 8 is a schematic diagram of a coupling simulation result of the integrated transformer provided in this embodiment;
fig. 9 is a schematic diagram of a turn ratio simulation result of the integrated transformer provided in this embodiment.
Wherein, in the figures, the respective reference numerals:
1-upper metal layer; 2-lower metal layer; 3-a connection port;
4-metal layer top view; 41-primary coil; 411 — first input of primary coil; 412 — a second input of the primary coil; 42-a secondary coil; 421-a first output of the secondary winding; 422-second output of secondary winding;
5-metal layer top view coil diagram; 51-primary coil; 511-a first coil; 512-a second coil; 52-a secondary coil; 521-a third coil; 522-a fourth coil;
01-simulation result of the integrated transformer of the invention; 02-simulation results of existing integrated transformers.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
An integrated transformer according to the present invention will now be described. The integrated transformer includes:
a plurality of metal layers arranged in a stacked manner, each of the metal layers being provided with a coil;
the dielectric layers are positioned between two adjacent metal layers, and each dielectric layer is provided with a through hole;
the input ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the input ends in the dielectric layer, and the output ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the output ends in the dielectric layer.
The input ends of the coils of the two adjacent metal layers penetrate through the through holes corresponding to the input ends in the medium layer to be connected, and the output ends of the coils of the two adjacent metal layers penetrate through the through holes corresponding to the output ends in the medium layer to be connected, so that the upper metal layer and the lower metal layer in the integrated transformer are connected through the corresponding through holes in the medium layer to realize the communication between the metal layers of the integrated transformer, and the metal layers are not completely attached and connected.
For example, referring to fig. 1, as shown in fig. 1, taking the metal layers of the integrated transformer as two layers, a through hole is formed on the dielectric layer, an output end of the upper metal layer 1 and an output end of the lower metal layer 2 are connected through the through hole corresponding to the output end on the dielectric layer to form a connection port 3, and an input end of the upper metal layer 1 and an input end of the lower metal layer 2 are also connected through the through hole corresponding to the input end on the dielectric layer, so that the upper metal layer 1 and the lower metal layer 2 are directly connected through the through hole on the dielectric layer.
It should be understood that most of the existing integrated transformers are formed by completely attaching a plurality of metal layers to each other, such transformers composed of the completely attached metal layers, the skin effect may be caused by the complete attachment between the metal layers, the multiple metal layers attached to each other are easily integrated under the influence of the skin effect, so that the internal current is concentrated on the integrated surface, that is, the surface of the outermost layer among the multiple metal layers is the effective cross section of the current, which makes the effective cross sections of the current equal to four cross sections, namely, the upper, the lower, the left and the right cross sections, regardless of the number of metal layers, resulting in poor performance, and even if the effective cross section can be increased by increasing the number of metal layers, the increased effective cross section is also small.
In this embodiment, the upper metal layer and the lower metal layer in the integrated transformer are connected through the corresponding through holes, and specifically, the coil of the upper metal layer and the coil of the lower metal layer directly penetrate through the corresponding through holes to be connected, so as to realize the communication between the upper metal layer and the lower metal layer, and enable the incomplete bonding connection between the metal layers.
Taking two metal layers of an integrated transformer as an example, as shown in fig. 2, fig. 2 is an effective cross-sectional view of two metal layers with current in the integrated transformer, the metal layers in the existing integrated transformer are completely attached, and the effective cross-sections of the current flowing through the completely attached metal layers are a, b, c, d, g and h, while the integrated transformer provided by this embodiment is provided with a dielectric layer, the metal layers are connected with the metal layers only at the input end and the output end through corresponding through holes on the dielectric layer, as shown in fig. 3, the metal layers are not attached to each other, the effective cross-sections of the upper metal layer are a, b, f and d, and the effective cross-sections of the lower metal layer are e, g, c and h. Therefore, the integrated transformer provided by the invention can increase the total effective cross section with current of the integrated transformer by increasing the number of the metal layers in the integrated transformer, and the more the number of the metal layers is, the larger the total effective cross section with current of the integrated transformer is, so that the effective cross section with current of the integrated transformer under the skin effect is increased, and the performance of the integrated transformer is improved.
In the invention, the integrated transformer comprises a plurality of metal layers which are arranged in a stacked mode, and each metal layer is provided with a coil; each dielectric layer is positioned between two adjacent metal layers, and each dielectric layer is provided with a through hole; the input ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the input ends in the dielectric layer, and the output ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the output ends in the dielectric layer; in the invention, the dielectric layer is arranged between the metal layers, the dielectric layer is provided with the through holes, and the coils of the two adjacent metal layers are connected through the corresponding through holes, so that the metal layers of the integrated transformer can be connected only by arranging the through holes on the dielectric layer, the current circulation is realized without completely fitting the metal layers, the influence caused by the skin effect is greatly reduced, each metal layer has four effective sections, namely an upper effective section, a lower effective section, a left effective section and a right effective section, the more the number of the metal layers is, the larger the effective section is, and the total effective section of the current of the integrated transformer can be greatly increased by increasing the number of the metal layers, thereby effectively improving the performance of the integrated transformer.
Further, as a specific embodiment of the integrated transformer provided by the present invention, the structures of the metal layers are the same.
For example, the coil positions and structures in each metal layer are the same, and the positions and sizes of the corresponding through holes in each dielectric layer are also the same, so that the metal layers and the metal layers can be directly matched and overlapped, primary coils in different metal layers are overlapped, secondary coils are also overlapped, and when the integrated transformer is seen from a top view, the coils on each metal layer are overlapped layer by layer, so that when a certain coil of the integrated transformer breaks down, other metal layers can be directly used for replacement, and the integrated transformer is convenient and quick.
In this embodiment, the structures of the metal layers are the same and are only exemplary, and in other embodiments, the structures of the metal layers may be other. And will not be described in detail herein.
Further, as a specific embodiment of the integrated transformer provided by the present invention, the coil includes a primary coil and a secondary coil, the primary coil and the secondary coil are coupled with each other, the primary coils of two adjacent metal layers are connected by corresponding through holes, and the secondary coils of two adjacent metal layers are connected by corresponding through holes.
For example, as shown in fig. 4, fig. 4 is a top view of a metal layer, and includes a primary coil 41 and a secondary coil 42, where the primary coil 41 includes a first input terminal 411 and a second input terminal 412, the secondary coil 42 includes a first output terminal 421 and a second output terminal 422, the first input terminal 411 of the primary coil 41 is connected to the first input terminal of the primary coil of the adjacent metal layer, the second input terminal 412 of the primary coil 41 is connected to the second input terminal of the primary coil of the adjacent metal layer, the first output terminal 421 of the secondary coil 42 is connected to the first output terminal of the secondary coil of the adjacent metal layer, and the second output terminal 422 of the secondary coil 42 is connected to the second output terminal of the secondary coil of the adjacent metal layer.
Under the condition that the total effective section of the integrated transformer with current is not changed, the widths of the primary coil and the secondary coil on each metal layer can be designed to be narrower/thinner by increasing the number of the metal layers arranged in a stacking mode in the integrated transformer, so that the plane area of the metal layers is effectively reduced, and the size of the integrated transformer is effectively saved.
In this embodiment, the metal layers include primary coils and secondary coils, mutual coupling between primary coils and the secondary coils, in addition, because integrated transformer can the metal layer be the same completely, loop through the through-hole interconnect on the dielectric layer between the primary coil of every layer of metal layer, the output of the primary coil of upper metal layer and the output of the primary coil of lower floor's metal layer pass through the through-hole that the output corresponds promptly, also loop through the through-hole interconnect that corresponds on the dielectric layer between the secondary coil of every layer of metal layer, the input of the secondary coil of upper metal layer and the input of the secondary coil of lower floor's metal layer pass through the through-hole that the input corresponds promptly and are connected, in order to realize the intercommunication between the integrated transformer metal layer, and make the incomplete laminating connection between each metal layer.
Further, as a specific embodiment of the integrated transformer provided by the present invention, the thicknesses of the dielectric layers are different, so as to adjust the thickness of the dielectric layer in the integrated transformer according to requirements. The thickness of the dielectric layer can affect the skin effect, and the integrated transformer has different dielectric layer thicknesses and different performance.
Further, as a specific embodiment of the integrated transformer provided by the present invention, the shapes of the primary coil and the secondary coil may be any shape such as a diamond shape, a rectangle shape, an arc shape, etc., so as to adjust the shape of the coil in the integrated transformer according to the requirement.
Further, as a specific embodiment of the integrated transformer provided by the present invention, the primary coil includes one or more turns of sub-coils, and the secondary coil includes one or more turns of sub-coils, so that a user can adjust the number of turns of the coils of the integrated transformer according to a requirement.
In this embodiment, the number of the through holes on the dielectric layer may vary according to the actual situation of the coils in the metal layers, and in two adjacent metal layers, as long as the connection between each sub-coil included in the primary coil of the upper metal layer and each sub-coil included in the primary coil of the lower metal layer is ensured, and the connection between each sub-coil included in the secondary coil of the upper metal layer and each sub-coil included in the secondary coil of the lower metal layer is ensured, the relative coupling position relationship between the primary coil and each sub-coil included in the secondary coil may be set by user according to the actual situation.
Further, the number of the sub-coils included in the primary coil and the secondary coil can be the same or different, and can be adjusted according to the actual requirement of the integrated transformer.
Furthermore, each turn of sub-coil in the primary coil is connected in series or in parallel, and each turn of sub-coil in the secondary coil is connected in series or in parallel.
Further, as a specific embodiment of the integrated transformer provided by the present invention, the primary coil includes a first sub-coil and a second sub-coil, and the secondary coil includes a third sub-coil and a fourth sub-coil.
Wherein the sub-coils comprised in the primary and secondary coils may be assembled in parallel and/or in series to obtain the required impedance matching for the coils on the respective metal layers.
Further, as a specific embodiment of the integrated transformer provided by the present invention, the first sub-coil and the second sub-coil are connected in series, and the third sub-coil and the fourth sub-coil are connected in series.
For example, the first sub-coil and the second sub-coil are connected in series, and the third sub-coil and the fourth sub-coil are connected in series. The turn ratio of the primary coil and the secondary coil is 1:1, the square of the turn ratio is equal to the impedance ratio, and when the turn ratio is 1:1, the impedance ratio is 1: 1.
For example, as shown in fig. 5, fig. 5 is a top coil plan view of a metal layer. The black coil 51 in fig. 5 is a primary coil including a first sub-coil 511 and a second sub-coil 512 connected in series between the first sub-coil 511 and the second sub-coil 512, the black coil 52 in fig. 5 is a secondary coil including a third sub-coil 521 and a fourth sub-coil 522 connected in series between the third sub-coil 521 and the fourth sub-coil 522. The impedance matching ratio of the primary coil 51 and the secondary coil 52 is 1: 1. And the black circle is the port position where the metal layer is connected with the adjacent metal layer, namely the position of the through hole on the dielectric layer. The number and the actual positions of the through holes can be set according to actual conditions, as long as the connection between each sub-coil contained in the primary coil of the metal layer and each sub-coil contained in the primary coil of the adjacent metal layer is ensured, and the connection between each sub-coil contained in the secondary coil of the metal layer and each sub-coil contained in the secondary coil of the adjacent metal layer is ensured.
It should be noted that the above-mentioned drawings only show some embodiments of the present invention, the number of turns of the sub-coils included in the primary coil and the secondary coil can be set by a user according to the actual situation, the coil thicknesses of the primary coil and the secondary coil can be set by a user according to the actual situation, and the coupling position relationship between each of the sub-coils included in the primary coil and the secondary coil can also be set by a user according to the actual situation.
Further, as a specific embodiment of the integrated transformer provided by the present invention, the first sub-coil and the second sub-coil are connected in parallel, and the third sub-coil and the fourth sub-coil are connected in series.
For example, the first sub-coil and the second sub-coil are connected in parallel, and the third sub-coil and the fourth sub-coil are connected in series. The turn ratio of the primary coil and the secondary coil is 2:1, the square of the turn ratio is equal to the impedance ratio, and when the turn ratio is 2:1, the impedance ratio is 4: 1.
Further, as a specific embodiment of the integrated transformer provided by the present invention, the first sub-coil and the second sub-coil are connected in series, and the third sub-coil and the fourth sub-coil are connected in parallel.
For example, the first sub-coil and the second sub-coil are connected in series, and the third sub-coil and the fourth sub-coil are connected in parallel. The turn ratio of the primary coil and the secondary coil is 1:2, the square of the turn ratio is equal to the impedance ratio, and when the turn ratio is 1:2, the impedance ratio is 1: 4.
Further, as a specific embodiment of the integrated transformer provided by the present invention, the first sub-coil and the second sub-coil are connected in parallel, and the third sub-coil and the fourth sub-coil are connected in parallel.
For example, the first sub-coil and the second sub-coil are connected in parallel, and the third sub-coil and the fourth sub-coil are connected in parallel. The turn ratio of the primary coil and the secondary coil is 2:2, the square of the turn ratio is equal to the impedance ratio, and when the turn ratio is 2:2, the impedance ratio is 4: 4.
In the invention, the metal layers of the integrated transformer are two layers, the primary coil comprises a first sub-coil and a second sub-coil, the secondary coil comprises a third sub-coil and a fourth sub-coil, the first sub-coil and the second sub-coil are connected in parallel, and the third sub-coil and the fourth sub-coil are connected in series, for example, simulation software is used for simulating the integrated transformer and the existing integrated transformer (the metal layers are completely attached), and the simulation result is shown in fig. 6, 7 and 8.
Wherein, the thick black line 01 in the figure represents the simulation result of the integrated transformer of the present invention, the thin black line 02 represents the simulation result of the existing integrated transformer, fig. 6 represents the inductance condition of the integrated transformer, the horizontal axis represents the frequency (freq, unit GHz), the vertical axis L represents the inductance, Lpri represents the inductance of the primary coil, and Lsec represents the inductance of the secondary coil, in the integrated transformer, the more gradual the inductance represents the performance of the integrated transformer, as can be seen from fig. 6, the better the inductance curve of the integrated transformer provided by the present invention is gentler than the inductance curve of the existing integrated transformer, the performance of the integrated transformer provided by the present invention is better than the performance of the existing integrated transformer; fig. 7 shows the quality of the integrated transformer, where the horizontal axis is frequency (freq, unit GHz), the vertical axis L is quality factor, Lpri is quality factor of the primary coil, and Lsec is quality factor of the secondary coil, and in the integrated transformer, the larger the quality factor is, the slower the energy loss of the integrated transformer is indicated, and as can be seen from fig. 7, the quality factor curve of the integrated transformer provided by the present invention is better than that of the existing integrated transformer, and the energy loss of the integrated transformer provided by the present invention is lower than that of the existing integrated transformer; fig. 8 shows the coupling efficiency of the integrated transformer, where the horizontal axis is frequency (freq, unit GHz), and the vertical axis k is the coupling coefficient, and the smaller the fluctuation of the coupling coefficient with frequency in the integrated transformer is, the better the coupling coefficient is, and it can be seen from fig. 8 that the coupling efficiency curve of the integrated transformer provided by the present invention is gentler than that of the existing integrated transformer, and the fluctuation of the coupling coefficient of the integrated transformer provided by the present invention with frequency is smaller.
In the present invention, two metal layers of an integrated transformer are taken as an example, simulation software is also used to simulate the change situation of the turn ratio along with the frequency between the integrated transformer of the present invention and the existing integrated transformer (the metal layers are completely attached), the simulation result is shown in fig. 9, the black thick line in the figure represents the simulation result of the integrated transformer of the present invention, the black thin line represents the simulation result of the existing integrated transformer, the horizontal axis represents the frequency (freq, unit GHz), the vertical axis T represents the turn ratio of the coil, the smaller the turn ratio of the coil is required to fluctuate along with the frequency in the integrated transformer, as can be seen from fig. 9, the turn ratio curve of the coil of the integrated transformer provided by the present invention is gentler than that of the coil of the existing integrated transformer, and the turn ratio of the coil of the integrated transformer provided by the present invention fluctuates along with the frequency less.
The working principle of the integrated transformer is as follows: the dielectric layer is arranged between the metal layers and the through holes are arranged on the dielectric layer, so that the metal layers written by the integrated transformer can be connected only by arranging the through holes on the dielectric layer, the current circulation can be realized without completely fitting the metal layers, the communication between the metal layers of the integrated transformer is realized, the incomplete fitting connection among the metal layers is realized, the influence caused by the skin effect is greatly reduced, each metal layer has four effective sections, namely an upper effective section, a lower effective section, a left effective section and a right effective section, the more the number of the metal layers is, the larger the effective section is, the more the number of the metal layers is, the larger the total effective section with the current of the integrated transformer can be increased by increasing the number of the metal layers in the integrated transformer, and the effective section with the current of the integrated transformer under the skin effect is increased, therefore, the performances of the integrated transformer such as inductance, quality factor, coupling coefficient and the like are effectively improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. An integrated transformer, comprising:
the coil is arranged on each metal layer, and the structures of the metal layers are the same;
the dielectric layers are positioned between two adjacent metal layers, and each dielectric layer is provided with a through hole;
the input ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the input ends in the dielectric layer, and the output ends of the coils in the two adjacent metal layers are connected through the through holes corresponding to the output ends in the dielectric layer;
the coil comprises a primary coil and a secondary coil, the primary coil comprises a first input end and a second input end, the secondary coil comprises a first output end and a second output end, the primary coil and the secondary coil in each metal layer are coupled with each other, the first input ends of the primary coils of two adjacent metal layers are connected through corresponding through holes, and the second input ends of the primary coils of two adjacent metal layers are connected through corresponding through holes; the first output ends of the secondary coils of two adjacent metal layers are connected through corresponding through holes, and the second output ends of the secondary coils of two adjacent metal layers are connected through corresponding through holes.
2. The integrated transformer of claim 1, wherein the primary coil comprises one or more sub-coils and the secondary coil comprises one or more sub-coils.
3. The integrated transformer of claim 2, wherein each of the turns of the primary winding are connected in series or in parallel and each of the turns of the secondary winding are connected in series or in parallel.
4. The integrated transformer of claim 3, wherein the primary coil comprises a first sub-coil and a second sub-coil, and the secondary coil comprises a third sub-coil and a fourth sub-coil.
5. The integrated transformer of claim 4, wherein the first sub-coil and the second sub-coil are connected in parallel, and the third sub-coil and the fourth sub-coil are connected in series.
6. The integrated transformer of claim 4, wherein the first sub-coil and the second sub-coil are connected in series, and the third sub-coil and the fourth sub-coil are connected in parallel.
7. The integrated transformer of claim 4, wherein the first sub-coil and the second sub-coil are connected in parallel, and the third sub-coil and the fourth sub-coil are connected in parallel.
8. The integrated transformer of claim 4, wherein the first sub-coil and the second sub-coil are connected in series, and the third sub-coil and the fourth sub-coil are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010407902.2A CN111430131B (en) | 2020-05-14 | 2020-05-14 | Integrated transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010407902.2A CN111430131B (en) | 2020-05-14 | 2020-05-14 | Integrated transformer |
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|---|---|
| CN111430131A CN111430131A (en) | 2020-07-17 |
| CN111430131B true CN111430131B (en) | 2021-07-23 |
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| CN202010407902.2A Active CN111430131B (en) | 2020-05-14 | 2020-05-14 | Integrated transformer |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157488A (en) * | 2011-01-05 | 2011-08-17 | 江苏科技大学 | Integrated laminated transformer based on two layers of metal |
| CN109087798A (en) * | 2018-07-26 | 2018-12-25 | 努比亚技术有限公司 | A kind of wireless charging electric wire coil assembly |
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| CN104952834B (en) * | 2014-03-26 | 2019-01-18 | 瑞昱半导体股份有限公司 | Integrated transformer |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157488A (en) * | 2011-01-05 | 2011-08-17 | 江苏科技大学 | Integrated laminated transformer based on two layers of metal |
| CN102157488B (en) * | 2011-01-05 | 2012-08-15 | 江苏科技大学 | Integrated laminated transformer based on two layers of metal |
| CN109087798A (en) * | 2018-07-26 | 2018-12-25 | 努比亚技术有限公司 | A kind of wireless charging electric wire coil assembly |
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Address after: 518000 room 2001, building 3, Shenzhen new generation industrial park, 136 Zhongkang Road, Meidu community, Meilin street, Futian District, Shenzhen City, Guangdong Province Patentee after: Ruishi Chuangxin (Shenzhen) Technology Co.,Ltd. Address before: 518000 508, building 541, Bagualing Industrial Zone, 23 Bagualing 6th Street, Hualin community, Yuanling street, Futian District, Shenzhen City, Guangdong Province Patentee before: AN ADVANCED RF POWER AMPLIFIER AND COMMUNICATION DEVICE |