CN114724846A - Transformer winding preparation method and device and planar transformer - Google Patents

Transformer winding preparation method and device and planar transformer Download PDF

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CN114724846A
CN114724846A CN202110008848.9A CN202110008848A CN114724846A CN 114724846 A CN114724846 A CN 114724846A CN 202110008848 A CN202110008848 A CN 202110008848A CN 114724846 A CN114724846 A CN 114724846A
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coil
transformer winding
power loss
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planar transformer
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CN114724846B (en
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任文
廖胜峰
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/071—Winding coils of special form
    • H01F41/074—Winding flat coils
    • G—PHYSICS
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    • G06F—ELECTRIC DIGITAL DATA PROCESSING
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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
    • H01F27/2871—Pancake coils
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The invention provides a transformer winding preparation method and device and a planar transformer. The preparation method of the transformer winding provided by the invention comprises the following steps: receiving size parameters of a coil in a planar transformer winding model, wherein the size parameters of the coil comprise the distance from the coil to a column air gap in a magnetic core in the planar transformer winding; and obtaining the total power loss of the coil in the planar transformer winding model according to the size parameters of the coil, and adjusting the size parameters of the coil in the planar transformer winding model until the proportion of the direct current power loss in the total power loss of the coil is smaller than a preset value. The transformer winding prepared by the preparation method of the transformer winding provided by the invention has smaller total power loss.

Description

Transformer winding preparation method and device and planar transformer
Technical Field
The invention relates to the technical field of transformers, in particular to a method and a device for preparing a transformer winding and a planar transformer.
Background
Nowadays, electronic products in various industries are not separated from a switching power supply, and as a high-efficiency power supply device, the application of the switching power supply is receiving attention, and a transformer, an inductor and the like are indispensable magnetic devices in the switching power supply.
Chinese patent CN201610143040.0 discloses a planar transformer, which comprises an upper magnetic core, a lower magnetic core and a plurality of flat coils disposed between the upper and lower magnetic cores, wherein adjacent flat coils are insulated, each flat coil is formed by winding a plurality of turns of metal conductor into a spiral shape, the plurality of flat coils are vertically projected in space and overlapped up and down, one part of the plurality of flat coils forms a primary winding of the planar transformer, the other part forms a secondary winding of the planar transformer, and the width of each turn of each flat coil is changed according to the outward direction of the center of each coil in the following form: w1: w2: … …: and Wn is 1: a: …: an-1, W is the coil width, n is the number of coil turns, n is more than or equal to 1, a is more than or equal to 0.5 and less than 1 or a is more than 1 and less than or equal to 1.5, and the change trends of the coil width of each turn of each flat coil are consistent with each other. The magnetic field distribution of the transformer can be changed by changing the width of each coil turn, thereby changing the coupling performance and the alternating current loss.
However, when the coil loss in the transformer is calculated, the dc power loss is not calculated, and in the process of calculating the ac power loss, the influence of the distance from the coil to the air gap in the magnetic core in the planar transformer winding on the ac power loss is not considered, so that it is difficult to design a better transformer winding, and the power density and the system efficiency of the transformer are both low.
Disclosure of Invention
The embodiment of the invention provides a method and a device for preparing a transformer winding and a planar transformer, which can improve the power density and the system efficiency of the transformer.
In a first aspect, the present invention provides a method for preparing a transformer winding, including: receiving size parameters of a coil in a planar transformer winding model, wherein the size parameters of the coil comprise the distance from the coil to a column air gap in a magnetic core in the planar transformer winding; and obtaining the total power loss of the coil in the planar transformer winding model according to the size parameter of the coil, and adjusting the size parameter of the coil in the planar transformer winding model until the proportion of the direct current power loss in the total power loss of the coil is less than or equal to a preset value.
Optionally, in the above method for manufacturing a transformer winding, receiving a size parameter of a coil in a planar transformer winding model specifically includes:
and acquiring the number of turns of the copper foil of the coil in the planar transformer winding model, the width of the copper foil corresponding to the coil and the distance from the coil to the air gap in the magnetic core in the planar transformer winding.
Optionally, in the above method for manufacturing a transformer winding, obtaining a total power loss of a coil in a planar transformer winding model according to a size parameter of the coil specifically includes:
obtaining the direct current power loss and the alternating current power loss of a coil in a planar transformer winding model according to the size parameters of the coil;
and obtaining the total power loss of the coil according to the direct current power loss and the alternating current power loss of the coil.
Optionally, in the above method for manufacturing a transformer winding, the obtaining of the dc power loss and the ac power loss of the coil in the planar transformer winding model according to the size parameter of the coil specifically includes:
obtaining a first alternating current power loss and a second alternating current power loss of the coil according to the size parameter of the coil, wherein the first alternating current power loss is the power loss caused by the proximity effect of the coil, and the second alternating current power loss is the power loss caused by the skin effect of the coil;
and obtaining the alternating current power loss of the coil according to the first alternating current power loss and the second alternating current power loss.
Optionally, in the above method for manufacturing a transformer winding, the obtaining of the first ac power and the second ac power loss of the coil according to the size parameter of the coil specifically includes:
according to the formula
Figure RE-GDA0003020999390000021
A first ac loss is obtained in that,
according to the formula
Figure RE-GDA0003020999390000031
Obtaining a second AC loss, wherein the parameter Pac2Is the first AC loss, Pac1For the second AC loss, parameter WnThe width of copper foil corresponding to the coil is defined, and the parameter rho is the resistivity of the coil and the parameter N isnThe number of turns of the copper foil of the nth layer coil, parameter InIs the alternating current of the n-th layer coil, parameter lnThe distance from the nth layer coil to the air gap in the magnetic core in the planar transformer winding is defined as the parameter Ks1As skin effect coefficient, parameter Ks2Is a proximity effect parameter.
Optionally, in the above method for manufacturing a transformer winding, the obtaining of the first ac power and the second ac power loss of the coil according to the size parameter of the coil specifically includes:
according to the formula
Figure RE-GDA0003020999390000032
A first ac loss is obtained in that,
according to the formula
Figure RE-GDA0003020999390000033
Obtaining a second AC loss, wherein the parameter Pac4Is the first AC loss, Pac3For the second AC loss, parameter WmThe width of each turn of coil is defined as parameter rho, resistivity of the coil, parameter m, number of layers in which the coil is located, parameter I, number of turns of each turn of coil in the same layer, and parameter lmFrom the m-th layer coil to the flatDistance of air gap in magnetic core center post in surface transformer winding, parameter Ks1As skin effect coefficient, parameter Ks2Is the proximity effect coefficient.
Optionally, in the above method for manufacturing a transformer winding, the obtaining of the dc power loss and the ac power loss of the coil in the planar transformer winding model according to the size parameter of the coil specifically includes:
according to the formula
Figure RE-GDA0003020999390000034
Obtaining the DC power loss of the coil, wherein the parameter PdcThe direct current power loss of the coil is defined as a parameter rho, the resistivity of the coil, a parameter L, a parameter S, a sectional area of the coil and a parameter IdcIs the direct current of the coil.
In a second aspect, the present invention provides a transformer winding preparation apparatus, including:
the input module is used for receiving the size parameters of the coil in the planar transformer winding model, wherein the size parameters of the coil comprise the distance from the coil to a column air gap in a magnetic core in the planar transformer winding;
and the power consumption adjusting module is used for obtaining the total power loss of the coil in the planar transformer winding model according to the size parameter of the coil and adjusting the size parameter of the coil in the planar transformer winding model until the proportion of the direct current power loss in the total power loss of the coil is smaller than a preset value.
In a third aspect, the present invention provides a planar transformer, comprising a magnetic core and a planar transformer winding formed by a coil, wherein the planar transformer winding is prepared by the above-mentioned transformer winding preparation method.
In a fourth aspect, the present invention provides a transformer winding preparation apparatus, including a processor; a memory; and a computer program; wherein a computer program is stored in the memory and configured to be executed by the processor, the computer program comprising instructions for performing the method as described above.
The invention provides a method and a device for preparing a transformer winding, and a method for preparing the transformer winding in a planar transformer, wherein the method comprises the following steps: receiving size parameters of a coil in a planar transformer winding model, wherein the size parameters of the coil comprise the distance from the coil to a column air gap in a magnetic core in the planar transformer winding; and obtaining the total power loss of the coil in the planar transformer winding model according to the size parameter of the coil, and adjusting the size parameter of the coil in the planar transformer winding model until the proportion of the direct current power loss in the total power loss of the coil is smaller than a preset value. The transformer winding prepared by the preparation method of the transformer winding provided by the invention has smaller total power loss, and can improve the power density and system efficiency of the planar transformer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for manufacturing a transformer winding according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of obtaining total power loss of a coil in a planar transformer winding model according to a size parameter of the coil in a transformer winding manufacturing method according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of obtaining the dc power loss and the ac power loss of the coil in the planar transformer winding model according to the size parameter of the coil in the transformer winding manufacturing method according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a planar transformer winding formed by a multi-layer multi-turn copper foil coil;
FIG. 5 is a schematic winding diagram of a planar transformer composed of same-layer multi-turn copper foil coils;
fig. 6 is a schematic structural diagram of a transformer winding preparation apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a transformer winding preparation apparatus according to an embodiment of the present invention;
fig. 8 is a schematic perspective view of a planar transformer according to an embodiment of the present invention.
Reference numerals:
1-an input module;
2-a power consumption adjustment module;
10-a magnetic core;
11-magnetic core center leg;
20-planar transformer windings;
100-transformer winding preparation device;
110-a processor;
120-a communication interface;
130-a memory;
140-a bus;
200-planar transformer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. All other embodiments obtained are within the scope of protection of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It should be noted that, in the description of the present invention, the terms "first", "second" and "third" are used merely for convenience of describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature.
Nowadays, electronic products in various industries are not separated from a switching power supply, and the application of the switching power supply is receiving much attention as a high-efficiency power supply device, while a transformer, an inductor, and the like are indispensable magnetic devices in the switching power supply, in recent years, power electronic devices are continuously developing towards small volume, high power density, and high efficiency, the transformer is a key device with larger volume, the miniaturization and the high efficiency of the transformer are more concerned, a planar transformer replaces a traditional transformer due to the advantages of miniaturization and high efficiency, a winding of the planar transformer is distributed on a multilayer PCB, under the normal condition, in order to avoid saturation of a magnetic core, an air gap is added in a center pillar of the magnetic core, specifically, in order to ensure that the magnetic flux of the magnetic core is large enough, the magnetic core needs to be polished at a butt joint of the magnetic core, so that the magnetic core has a gap of 0.1mm to 1mm in the butt joint in appearance, the gap is the air gap.
Chinese patent CN201610143040.0 discloses a planar transformer, which comprises an upper magnetic core, a lower magnetic core and a plurality of flat coils disposed between the upper and lower magnetic cores, wherein adjacent flat coils are insulated, each flat coil is formed by winding a plurality of turns of metal conductor into a spiral shape, the plurality of flat coils are vertically projected in space and overlapped up and down, one part of the plurality of flat coils forms a primary winding of the planar transformer, the other part of the plurality of flat coils forms a secondary winding of the planar transformer, and the width of each turn of each flat coil is changed according to the outward direction of the center of each coil in the following form: w1: w2: … …: and Wn is 1: a: …: an-1, W is the coil width, n is the number of coil turns, n is more than or equal to 1, a is more than or equal to 0.5 and less than 1 or a is more than 1 and less than or equal to 1.5, and the change trends of the coil width of each turn of each flat coil are consistent with each other. The magnetic field distribution of the transformer can be changed by changing the width of each coil turn, so that the coupling performance and the alternating current loss are changed.
However, the above patent application has the following disadvantages in calculating the coil loss in the transformer:
firstly, direct current power loss is not calculated;
and secondly, in the process of calculating the alternating current power loss, the influence of the distance from the coil to the air gap in the magnetic core in the planar transformer winding on the alternating current power loss is not considered.
Therefore, it is difficult to design a better transformer winding, which results in a lower power density and a lower system efficiency of the transformer.
In order to overcome the defects in the prior art, the invention provides a method and a device for preparing a transformer winding and a planar transformer, which can improve the power density and the system efficiency of the transformer.
The present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can more clearly understand the contents of the present invention in detail.
Fig. 1 is a schematic flow chart of a method for manufacturing a transformer winding according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for manufacturing a transformer winding, including:
s101, receiving size parameters of a coil in a planar transformer winding model, wherein the size parameters of the coil comprise the distance from the coil to a column air gap in a magnetic core in the planar transformer winding.
It should be noted that the planar transformer winding model is a data model, and has various dimensional parameters of the coils in the transformer winding.
S102, obtaining the total power loss of the coil in the planar transformer winding model according to the size parameter of the coil, and adjusting the size parameter of the coil in the planar transformer winding model until the proportion of the direct current power loss in the total power loss of the coil is smaller than or equal to a preset value.
In a specific implementation of this embodiment, the preset value may be 10% of the total power loss of the coil.
Optionally, in this embodiment, receiving the size parameter of the coil in the planar transformer winding model specifically includes:
and acquiring the number of turns of the copper foil of the coil in the planar transformer winding model, the width of the copper foil corresponding to the coil and the distance from the coil to the air gap in the magnetic core in the planar transformer winding.
It should be noted that, the above-mentioned manner of obtaining the number of turns of the copper foil of the coil in the planar transformer winding model, the manner of obtaining the width of the copper foil corresponding to the coil, and the manner of obtaining the distance from the coil to the air gap in the core of the planar transformer winding may be a manner of performing calculation measurement on each parameter of the coil by some electronic devices, and the specific manner of obtaining the above-mentioned parameters is not particularly limited.
The preparation method of the transformer winding provided by the embodiment comprises the following steps: receiving size parameters of a coil in a planar transformer winding model, wherein the size parameters of the coil comprise the distance from the coil to a column air gap in a magnetic core in the planar transformer winding; and obtaining the total power loss of the coil in the planar transformer winding model according to the size parameter of the coil, and adjusting the size parameter of the coil in the planar transformer winding model until the proportion of the direct current power loss in the total power loss of the coil is smaller than a preset value. Wherein, through introducing the coil to the distance parameter of magnetic core center pillar air gap among the planar transformer winding for the alternating current power's of the coil that obtains loss is more accurate, and in addition, through making the direct current power loss of coil reach a definite value, can reduce the total loss of power of coil.
Fig. 2 is a schematic flowchart of obtaining a total power loss of a coil in a planar transformer winding model according to a size parameter of the coil in a transformer winding manufacturing method according to an embodiment of the present invention.
As shown in fig. 2, in a specific implementation manner of this embodiment, obtaining the total power loss of the coil in the planar transformer winding model according to the size parameter of the coil specifically includes:
s201, obtaining the direct current power loss and the alternating current power loss of the coil in the planar transformer winding model according to the size parameters of the coil.
Therefore, the total power loss of the coil in the planar transformer winding model can be accurately obtained by obtaining the direct current power loss and the alternating current power loss of the coil in the planar transformer winding model according to the size parameters of the coil, so that the size parameters of the coil can be adaptively adjusted, a better coil design is obtained, and the total power loss of the coil in the planar transformer winding model is smaller.
S202, obtaining the total power loss of the coil according to the direct current power loss and the alternating current power loss of the coil.
Specifically, the direct current power loss and the alternating current power loss of the coil are obtained through determining and calculating various size parameters of the coil, and the direct current power loss and the alternating current power loss of the coil are added to obtain the total power loss of the coil.
Fig. 3 is a schematic flowchart of a process of obtaining a dc power loss and an ac power loss of a coil in a planar transformer winding model according to a size parameter of the coil in a transformer winding manufacturing method according to an embodiment of the present invention.
In a specific implementation manner of this embodiment, obtaining the dc power loss and the ac power loss of the coil in the planar transformer winding model according to the size parameter of the coil specifically includes:
s301, obtaining first alternating current power and second alternating current power loss of the coil according to the size parameter of the coil, wherein the first alternating current power loss is power loss caused by the proximity effect of the coil, and the second alternating current power loss is power loss caused by the skin effect of the coil.
It should be noted that, in the planar transformer, the coil generates the skin effect and the proximity effect, and the distance from the coil to the air gap in the core of the planar transformer winding is closely related to the ac power loss generated by the proximity effect.
The skin effect is also called as skin effect, and specifically, when alternating current or an alternating electromagnetic field exists in a conductor, the current distribution in the conductor is uneven, the current is concentrated on the skin part of the conductor, namely the current is concentrated on a thin layer on the outer surface of the conductor, the closer to the surface of the conductor, the higher the current density is, the smaller the current is actually in the conductor, and as a result, the resistance of the conductor is increased, and the power loss of the conductor is also increased; the proximity effect is a phenomenon that alternating currents approach to adjacent conductors in two conductors of a two-wire transmission line, and the higher the frequency and the magnetic permeability are, the smaller the resistivity is, the more remarkable the phenomenon is.
Further, in the power loss caused by the proximity effect of the coil and the power loss caused by the skin effect of the coil, one of the two may be larger than the other, and at this time, only the coil variable affecting the larger one of the two needs to be properly adjusted, so as to achieve the effect of reducing the power loss.
And S302, obtaining the alternating current power loss of the coil according to the first alternating current power loss and the second alternating current power loss.
The first alternating current power loss and the second alternating current power loss of the coil are obtained through determination and calculation of various size parameters of the coil, and the first alternating current power loss and the second alternating current power loss of the coil are added to obtain the alternating current power loss of the coil.
In some embodiments, obtaining the first ac power and the second ac power loss of the coil according to the size parameter of the coil specifically includes:
according to the formula
Figure RE-GDA0003020999390000091
A first ac loss is obtained in that,
according to the formula
Figure RE-GDA0003020999390000092
Obtaining a second AC loss, wherein the parameter Pac2Is the first AC loss, Pac1For the second AC loss, parameter WnThe width of copper foil corresponding to the coil is defined, and the parameter rho is the resistivity of the coil and the parameter N isnThe number of turns of the copper foil of the nth layer coil, parameter InIs the alternating current of the n-th layer coil, parameter lnThe distance from the nth layer coil to the air gap in the magnetic core in the planar transformer winding is defined as the parameter Ks1As skin effect coefficient, parameter Ks2Is a proximity effect parameter.
It should be noted that, in the above formula for calculating the first ac power and the second ac power loss of the coil, the planar transformer winding is composed of a multi-layer multi-turn copper foil coil.
Fig. 4 is a schematic winding diagram of a planar transformer composed of a multi-layer multi-turn copper foil coil.
As shown in FIG. 4, the planar transformer winding is composed of n layers of coils, each layer of coils consisting of mnAnd the coil is composed of turns, the current of each turn on the same layer is equal, and the line width of each turn on the same layer is equal.
According to the two formulas, when a certain layer of coil is far away from the center pillar of the magnetic core, the loss generated by the proximity effect is small, and the loss ratio generated by the skin effect is large, so that the width of the copper foil corresponding to the coil can be increased or the number of turns of the copper foil of the coil can be properly reduced, and the purpose of reducing the direct current power loss is achieved; when a certain layer of coil is close to the magnetic core center pillar, the influence generated by the proximity effect is strong, and the loss influence generated by the skin effect is far smaller than the loss influence generated by the proximity effect, so that the width of the copper foil corresponding to the coil or the number of turns of the layer of coil needs to be reduced, and the purpose of reducing the loss of direct current power is achieved.
In other embodiments, obtaining the first ac power and the second ac power loss of the coil according to the size parameter of the coil specifically includes:
according to the formula
Figure RE-GDA0003020999390000101
A first ac loss is obtained in that,
according to the formula
Figure RE-GDA0003020999390000102
Obtaining a second AC loss, wherein the parameter Pac4Is the first AC loss, Pac3For the second AC loss, parameter WmThe width of each turn of coil is defined as parameter rho, resistivity of the coil, parameter m, number of layers in which the coil is located, parameter I, number of turns of each turn of coil in the same layer, and parameter lmThe distance from the m-th layer coil to the air gap in the magnetic core in the planar transformer winding is defined as the parameter Ks1As skin effect coefficient, parameter Ks2Is the proximity effect coefficient.
It should be noted that, in the above formula for calculating the first ac power and the second ac power loss of the coil, the planar transformer winding is composed of a single-layer multi-turn copper foil coil.
Fig. 5 is a schematic winding diagram of a planar transformer composed of same-layer multi-turn copper foil coils.
As shown in FIG. 5, the planar transformer winding consists of a single layer of n turns of coils, each turn of coils having a width W of copper foil1～WmI.e. the width of the coil per turn is not uniform and the width of the coil closer to the leg of the core is smaller.
According to the two formulas, when the coil is far away from the center pillar of the magnetic core, the loss generated by the proximity effect is small, and the loss generated by the skin effect accounts for a large proportion, so that the width of the copper foil corresponding to the coil can be increased, and the purpose of reducing the direct current power loss is achieved; when the coil was close to the magnetic core center pillar, the loss that the skin effect produced was less, and the loss that the proximity effect produced accounts for than great, and at this moment, the loss influence that the skin effect produced can be less than the loss influence that the proximity effect produced far away, consequently, reduces the copper foil width that the coil corresponds, can reach the purpose that reduces the alternating current power loss.
In a specific implementation manner of this embodiment, obtaining a direct current power loss and an alternating current power loss of a coil in a planar transformer winding model according to a size parameter of the coil specifically includes:
according to the formula
Figure RE-GDA0003020999390000111
Obtaining the DC power loss of the coil, wherein the parameter PdcIs the DC power loss of the coil, the parameter rho is the resistivity of the coil, the parameter L is the length of the coil, the parameter S is the sectional area of the coil, and the parameter IdcIs the direct current of the coil.
Further, in this embodiment, obtaining the total power loss of the coil according to the dc power loss and the ac power loss of the coil specifically includes: and taking the sum of the direct current power loss and the alternating current power loss of the coil as the total power loss of the coil.
It should be noted that, when the planar transformer winding is composed of n layers of coils, the total power loss of a certain layer of coils is Pac1、Pac2And PdcThe sum of (a); when the planar transformer winding consists of a single layer coil, the total power loss for a turn is Pac3、Pac4And PdcThe sum of (a) and (b).
The method and the device for preparing the transformer winding and the planar transformer provided by the embodiment of the invention have the advantages that the method for preparing the transformer winding comprises the following steps: receiving size parameters of a coil in a planar transformer winding model, wherein the size parameters of the coil comprise the distance from the coil to a column air gap in a magnetic core in the planar transformer winding; and obtaining the total power loss of the coil in the planar transformer winding model according to the size parameter of the coil, and adjusting the size parameter of the coil in the planar transformer winding model until the proportion of the direct current power loss in the total power loss of the coil is smaller than a preset value. The transformer winding prepared by the preparation method of the transformer winding provided by the invention has smaller total power loss.
Fig. 6 is a schematic structural diagram of a transformer winding preparation apparatus according to an embodiment of the present invention. As shown in fig. 6, an embodiment of the present invention further provides a transformer winding preparation apparatus 100, including an input module 1 and a power consumption adjustment module 2, where the input module 1 is configured to receive a size parameter of a coil in a planar transformer winding model, and the size parameter of the coil includes a distance from the coil to a core-in-core air gap in the planar transformer winding; the power consumption adjusting module 2 is used for obtaining the total power loss of the coil in the planar transformer winding model according to the size parameter of the coil, and adjusting the size parameter of the coil in the planar transformer winding model until the proportion of the direct current power loss in the total power loss of the coil is smaller than a preset value.
It should be noted that, other parameters of the above-mentioned size parameters of the coil and the calculation method of the total power loss of the coil have been described in detail in the above-mentioned embodiments, and are not described herein again.
The transformer winding preparation apparatus 100 according to the embodiment of the present invention may implement the corresponding method embodiments described above, for example, the embodiments shown in fig. 1 to fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
It should be noted that the division of each unit of the above apparatus is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these units can be implemented entirely in software, invoked by a processing element; or may be implemented entirely in hardware; and part of the units can be realized in the form of calling by a processing element through software, and part of the units can be realized in the form of hardware. For example, the receiving unit may be a processing element separately set up, or may be implemented by being integrated into a chip of the apparatus, or may be stored in a memory of the apparatus in the form of a program, and a function of the receiving unit may be called and executed by a processing element of the apparatus. The other units are implemented similarly. In addition, all or part of the units can be integrated together or can be independently realized. The processing element here may be an integrated circuit with signal processing capabilities. In implementation, the steps of the method or the units above may be implemented by hardware integrated logic circuits in a processor element or instructions in software. Further, the above receiving unit is a unit that controls reception, and information can be received by a receiving device of the device, such as an antenna and a radio frequency device.
The above units may be one or more integrated circuits configured to implement the above methods, for example: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when the above units are implemented in the form of a processing element scheduler, the processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling programs. As another example, these units may be integrated together and implemented in the form of a system-on-a-chip (SOC).
Therefore, the total power loss of the transformer winding manufactured by the transformer winding manufacturing apparatus 100 provided by the present embodiment is small.
Fig. 7 is a schematic structural diagram of a transformer winding preparation apparatus according to an embodiment of the present invention. As shown in fig. 7, the transformer winding preparation apparatus 100 includes: the processor 110, the communication interface 120, and the memory 130, and the processor 110, the communication interface 120, and the memory 130 are connected to each other through an internal bus 140.
The processor 110 may be formed of one or more general-purpose processors, such as a Central Processing Unit (CPU), or a combination of a CPU and hardware chips. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
The bus 140 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus 140 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 7, but not only one bus or type of bus.
Memory 130 may include volatile memory (volatile memory), such as Random Access Memory (RAM); the memory 130 may also include a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory (flash memory), a Hard Disk Drive (HDD), or a solid-state drive (SSD); memory 130 may also include combinations of the above categories. The memory 130 may be used to store program codes and data for the processor 110 to call the program codes and data stored in the memory 130 to implement the functions of the input module 1 and the power consumption adjusting module 2 described above. The program code may be a functional module for implementing the transformer winding preparation apparatus shown in fig. 6 or a method step for implementing the transformer winding preparation apparatus as an execution subject in the method embodiments shown in fig. 1 to 3.
Part or all of the above units may also be implemented by being embedded on a chip of the route acquisition device in the form of an integrated circuit. And they may be implemented separately or integrated together. That is, the above units may be configured as one or more integrated circuits implementing the above methods, for example: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others.
The present application also provides a storage medium comprising: a readable storage medium and a computer program for implementing the method for preparing a transformer winding provided in any of the foregoing embodiments.
The present application also provides a program product comprising a computer program (i.e. executing instructions), the computer program being stored in a readable storage medium. The computer program may be read from a readable storage medium by at least one processor of the route acquisition device, and the computer program may be executed by the at least one processor to cause the transformer winding preparation apparatus to implement the transformer winding preparation method provided by the foregoing various embodiments.
All or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The aforementioned program may be stored in a readable memory. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned memory (storage medium) includes: read-only memory (ROM), RAM, flash memory, hard disk, solid state disk, magnetic tape (magnetic tape), floppy disk (optical disc), and any combination thereof.
Fig. 8 is a schematic perspective view of a planar transformer according to an embodiment of the present invention.
As shown in fig. 8, the present invention further provides a planar transformer 200, which includes a magnetic core 10 and a planar transformer winding 20 formed by a coil, wherein the planar transformer winding 20 is prepared by the transformer winding preparation method in the foregoing embodiment, and the specific steps of the transformer winding preparation method are described in detail in the foregoing embodiment, and are not repeated herein.
In the planar transformer 200 of the present embodiment, specifically, the magnetic core 10 has a magnetic core center pillar 11 therein, the planar transformer winding 20 is wound on the magnetic core center pillar 11, and the magnetic core center pillar 11 has a magnetic core center pillar air gap therein.
Therefore, the total power loss of the planar transformer winding 20 in the planar transformer 200 provided by the present embodiment is small, and the power density and the system efficiency of the planar transformer can be improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for preparing a transformer winding is characterized by comprising the following steps:
receiving a size parameter of a coil in a planar transformer winding model, wherein the size parameter of the coil comprises a distance from the coil to a column air gap in a magnetic core in the planar transformer winding;
and obtaining the total power loss of the coil in the planar transformer winding model according to the size parameter of the coil, and adjusting the size parameter of the coil in the planar transformer winding model until the proportion of the direct current power loss in the total power loss of the coil is less than or equal to a preset value.
2. The method for preparing a transformer winding according to claim 1, wherein the receiving dimensional parameters of the coil in the planar transformer winding model specifically comprises:
and acquiring the number of turns of copper foil of a coil in the planar transformer winding model, the width of the copper foil corresponding to the coil and the distance from the coil to a center pillar air gap of a magnetic core in the planar transformer winding.
3. The method for preparing a transformer winding according to claim 1, wherein the obtaining of the total power loss of the coil in the planar transformer winding model according to the dimensional parameter of the coil specifically comprises:
obtaining the direct current power loss and the alternating current power loss of the coil in the planar transformer winding model according to the size parameters of the coil;
and obtaining the total power loss of the coil according to the direct current power loss and the alternating current power loss of the coil.
4. The method for preparing a transformer winding according to claim 3, wherein the obtaining of the direct-current power loss and the alternating-current power loss of the coil in the planar transformer winding model according to the dimensional parameters of the coil specifically comprises:
obtaining a first alternating current power loss and a second alternating current power loss of the coil according to the size parameter of the coil, wherein the first alternating current power loss is a power loss caused by the proximity effect of the coil, and the second alternating current power loss is a power loss caused by the skin effect of the coil;
and obtaining the alternating current power loss of the coil according to the first alternating current power loss and the second alternating current power loss.
5. The method for preparing a transformer winding according to claim 4, wherein the obtaining of the first ac power and the second ac power loss of the coil according to the dimensional parameters of the coil specifically comprises:
according to the formula
Figure FDA0002884227170000021
The first ac loss is obtained in the first power supply,
according to the formula
Figure FDA0002884227170000022
Obtaining the second AC loss, wherein the parameter Pac2For the first AC loss, the Pac1For the second AC loss, the parameter WnThe width of the copper foil corresponding to the coil, the parameter rho is the resistivity of the coil, and the parameter N isnThe number of turns of copper foil of the nth layer of coil, the parameter InFor the alternating current of the coil of the n-th layer, the parameter lnThe distance from the coil of the nth layer to the air gap in the magnetic core in the planar transformer winding is defined as the parameter Ks1For skin effect coefficient, the parameter Ks2Is a proximity effect parameter.
6. The method for preparing a winding of a transformer according to claim 5, wherein the obtaining of the first ac power and the second ac power loss of the coil according to the dimensional parameters of the coil specifically comprises:
according to the formula
Figure FDA0002884227170000023
The first ac loss is obtained in that,
according to the formula
Figure FDA0002884227170000024
Obtaining the second AC loss, wherein the parameter Pac4For the first AC loss, the Pac3For the second AC loss, the parameter WmFor the width of each turn of the coil, the parameter rho is the resistivity of the coil, the parameter m is the number of layers where the coil is located, the parameter I is the number of turns of each turn of the coil in the same layer, and the parameter lmThe parameter K is the distance from the coil of the mth layer to the air gap in the magnetic core in the planar transformer windings1For skin effect coefficients, the parameter Ks2Is the proximity effect coefficient.
7. The method for preparing a transformer winding according to claim 3, wherein the obtaining of the direct-current power loss and the alternating-current power loss of the coil in the planar transformer winding model according to the dimensional parameters of the coil specifically comprises:
according to the formula
Figure FDA0002884227170000031
Obtaining a DC power loss of the coil, wherein the parameter PdcFor the direct current power loss of the coil, the parameter rho is the coilThe parameter L is the length of the coil, the parameter S is the sectional area of the coil, and the parameter IdcIs the direct current of the coil.
8. A transformer winding preparation apparatus, comprising:
the input module is used for receiving the size parameters of a coil in a planar transformer winding model, wherein the size parameters of the coil comprise the distance from the coil to a column air gap in a magnetic core in the planar transformer winding;
and the power consumption adjusting module is used for obtaining the total power loss of the coil in the planar transformer winding model according to the size parameter of the coil and adjusting the size parameter of the coil in the planar transformer winding model until the proportion of the direct current power loss in the total power loss of the coil is smaller than a preset value.
9. A planar transformer comprising a magnetic core and a planar transformer winding formed from a coil, said planar transformer winding being prepared by the method of preparing a transformer winding according to any one of claims 1 to 7.
10. A transformer winding preparation apparatus, comprising:
a processor;
a memory; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor, the computer program comprising instructions for performing the method of any of claims 1-7.
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