CN116435065A - Method for reducing leakage inductance of high-frequency transformer - Google Patents
Method for reducing leakage inductance of high-frequency transformer Download PDFInfo
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- CN116435065A CN116435065A CN202310564937.0A CN202310564937A CN116435065A CN 116435065 A CN116435065 A CN 116435065A CN 202310564937 A CN202310564937 A CN 202310564937A CN 116435065 A CN116435065 A CN 116435065A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004804 winding Methods 0.000 claims abstract description 140
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000011889 copper foil Substances 0.000 claims description 6
- 230000004907 flux Effects 0.000 abstract description 15
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
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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
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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
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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Abstract
The method for reducing leakage inductance of the high-frequency transformer provided by the invention comprises the following steps: dividing a primary winding group of the high-frequency transformer into at least 2 windings and connecting different name ends in series; dividing a secondary winding component of the high-frequency transformer into at least 3 windings and connecting the same-name ends in parallel; the number of turns of each secondary winding is the same; and the primary winding and the secondary winding are wound on the framework in a staggered manner. The method for reducing leakage inductance of the high-frequency transformer provided by the invention has the advantages that the primary winding and the secondary winding are divided into a plurality of windings with different numbers, so that the primary winding and the secondary winding are wound in a staggered way to form a winding structure of the high-voltage transformer, the magnetic field coupling between the primary winding and the secondary winding can be effectively increased, and the magnetic force lines generated by the primary magnetic field fully penetrate through the secondary winding, so that the leakage magnetic flux and bypass magnetic flux of the transformer are reduced, and the leakage inductance of the high-frequency transformer is reduced.
Description
Technical Field
The invention relates to the field of high-frequency transformers, in particular to a method for reducing leakage inductance of a high-frequency transformer.
Background
The high-frequency transformer is an important component of the switching power supply, the leakage inductance is an important index of the switching power supply, the performance index of the switching power supply is greatly affected, the leakage inductance is due to the fact that a magnetic field between a primary side and a secondary side of the transformer cannot be completely coupled, in the process of transmitting electric energy from the primary side to the secondary side of the switching power supply, surge current and peak voltage can be caused by the leakage inductance of the transformer, and the switching device is easy to break down due to overvoltage; the leakage inductance can also form an oscillating loop with the distributed capacitance in the circuit and the distributed capacitance of the transformer coil, so that the circuit can generate oscillation and radiate electromagnetic energy outwards, thereby causing electromagnetic interference.
In the prior art, winding methods which are common in manufacturing high-frequency transformers are two kinds of winding methods, namely a sequential winding method and a sandwich winding method. However, these two common winding methods still have large loss and poor electromagnetic interference characteristics, which are unfavorable for miniaturization of the power supply and improvement of power density. In the manufacturing process of the existing high-frequency transformer, larger leakage magnetic flux exists between the primary and the secondary, the larger leakage inductance exists in the primary and the secondary, the leakage magnetic flux cannot be coupled to the secondary winding, so that loss occurs when the high-frequency transformer works, and the larger the leakage inductance is, the larger the loss is, and the lower the efficiency is. In addition, when the high-frequency transformer is operated, leakage inductance occurs because the primary magnetic lines of force do not pass through the secondary, and the larger the leakage flux is, the larger the leakage inductance is, the larger the loss is, and the higher the temperature of the transformer is. The leakage flux percentage of the existing high-frequency transformer is generally 5-20% of the main flux. Moreover, the larger the leakage inductance is, the larger the electromagnetic interference is, so that the leakage inductance of the high-frequency transformer is reduced, and the method is a target generally pursued in the industry.
Disclosure of Invention
Based on this, it is necessary to provide a method of reducing leakage inductance of a high frequency transformer in response to at least one of the problems mentioned above.
The method for reducing leakage inductance of the high-frequency transformer comprises the following steps:
dividing a primary winding group of the high-frequency transformer into at least 2 windings and connecting different name ends in series;
dividing a secondary winding component of the high-frequency transformer into at least 3 windings and connecting the same-name ends in parallel; the number of turns of each secondary winding is the same, and the number of turns of each secondary winding is larger than the number of turns of each primary winding;
and the primary winding and the secondary winding are wound on the framework in a staggered manner.
In one embodiment, in the step of winding the primary winding and the secondary winding on the bobbin in a staggered manner, the first secondary winding is disposed inside a shield winding disposed at one end of the entire high-frequency transformer winding.
In one embodiment, the shielding winding is made of copper foil, and the head end and the tail end of the copper foil are subjected to insulation treatment.
In one embodiment, in the step of winding the primary winding and the secondary winding on the framework in a staggered manner, each winding is isolated by using an insulating tape.
The technical scheme provided by the embodiment of the invention has the following beneficial technical effects:
the method for reducing leakage inductance of the high-frequency transformer provided by the invention has the advantages that the primary winding and the secondary winding are divided into a plurality of windings with different numbers, so that the primary winding and the secondary winding are wound in a staggered way to form a winding structure of the high-voltage transformer, the magnetic field coupling between the primary winding and the secondary winding can be effectively increased, and the magnetic force lines generated by the primary magnetic field fully penetrate through the secondary winding, so that the leakage magnetic flux and bypass magnetic flux of the transformer are reduced, and the leakage inductance of the high-frequency transformer is reduced.
Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method for reducing leakage inductance of a high frequency transformer according to an embodiment of the invention;
fig. 2 is a schematic diagram of a winding structure of a high-frequency transformer according to an embodiment of the invention;
FIG. 3 is a schematic diagram of another view winding structure of a high-frequency transformer according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the transformer principle.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The figures show possible embodiments of the invention. This invention may, however, be embodied in many different forms and is not limited to the embodiments described herein with reference to the accompanying drawings. The embodiments described by reference to the drawings are exemplary for a more thorough understanding of the present disclosure and should not be construed as limiting the present invention. Furthermore, if detailed descriptions of known techniques are unnecessary for the illustrated features of the present invention, such technical details may be omitted.
It will be understood by those skilled in the relevant art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It should be understood that the term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
The following describes the technical solution of the present invention and how the technical solution solves the technical problems described above with specific examples.
The method for reducing leakage inductance of the high-frequency transformer provided by the application, as shown in fig. 1, comprises the following steps:
s100: the primary winding group of the high-frequency transformer is divided into at least 2 windings and the different-name end phases are connected in series.
S200: dividing a secondary winding component of the high-frequency transformer into at least 3 windings and connecting the same-name ends in parallel; the number of turns of each secondary winding is the same.
S300: the primary winding and the secondary winding are alternately wound on the framework.
It should be understood that, although the steps in the above description and the flowcharts of the drawings are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. It is also possible in this application to perform the steps in parallel or staggered, and the steps may be performed in other orders, without strict order limitation, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
Specifically, in certain embodiments of the present application, in the step of staggering the primary winding and the secondary winding around the bobbin, the first secondary winding is disposed inside the shield winding, which is disposed at one end of the entire high frequency transformer winding.
Optionally, in a specific implementation manner of the foregoing embodiment of the present application, the shielding winding uses a copper foil, and the end-to-end ends of the copper foil are subjected to insulation treatment.
Optionally, in another embodiment of the foregoing application, in the step of winding the primary winding and the secondary winding on the frame in a staggered manner, each winding is isolated by using an insulating tape.
The method for reducing leakage inductance of the high-frequency transformer provided by the invention has the advantages that the primary winding and the secondary winding are divided into a plurality of windings with different numbers, so that the primary winding and the secondary winding are wound in a staggered way to form a winding structure of the high-voltage transformer, the magnetic field coupling between the primary winding and the secondary winding can be effectively increased, and the magnetic force lines generated by the primary magnetic field fully penetrate through the secondary winding, so that the leakage magnetic flux and bypass magnetic flux of the transformer are reduced, and the leakage inductance of the high-frequency transformer is reduced.
The method for reducing leakage inductance of the high-frequency transformer provided by the invention adopts a winding structure that at least 2 primary winding coils and at least 3 secondary winding coils are wound in a staggered way, so that magnetic field coupling between the primary winding coils and the secondary winding coils can be effectively increased, magnetic force lines generated by a primary magnetic field fully penetrate through the secondary winding coils, thereby reducing leakage magnetic flux and bypass magnetic flux of the transformer, the more the number of primary winding and the secondary winding is, the more the magnetic field coupling between the primary winding and the secondary winding is increased, the more the magnetic force lines generated by the primary magnetic field fully penetrate through the secondary winding, and the leakage magnetic flux and bypass magnetic flux of the transformer are further reduced, and the leakage inductance of the high-frequency transformer is effectively reduced.
The following is only exemplified by 2 primary windings and 3 secondary windings, and specifically, the specific implementation method for winding the primary and secondary windings of the transformer is as follows:
the primary winding comprises NP1 and NP2, the number of turns is a1 and a2 respectively, at least 2 windings are arranged on the primary, the number of windings is equal to that of the windings, the secondary winding comprises NS1, NS2 and NS3, at least 3 windings are arranged on the secondary, the number of turns of each winding of the secondary winding is equal to that of the windings, and the number of turns of each winding of the secondary winding is equal to that of the windings. At least five windings are needed in total, one winding is added to each primary, one winding is also needed to be added to each secondary correspondingly, and the more the number of windings is, the smaller leakage inductance of the transformer is. As shown in fig. 2, the primary and secondary winding coils 101 may be single strand copper wires, multiple strands, wire-covered wires, litz wire, copper tape, PCB board coils, integrally formed coils, or the like. The wire diameters of the winding coils 101 may be the same, may not be the same, or may be different. The insulating tape 103 is used to wind the coil, and the insulating tape 103 may not be used.
In combination with the coil winding structure schematic diagrams, i.e. fig. 2 and 3, the primary winding coil 101 and the secondary winding coil 101 are wound on the transformer framework 102 in a staggered manner, and the magnetic core of the transformer is arranged on two sides of the transformer framework 102. Sequentially wound in the order NS1-NP1-NS2-NP2-NS3, with more windings, and so on. The number of turns of the primary windings NP1 and NP2 may be equal or unequal, the number of turns of each winding of the secondary windings NS1, NS2, NS3 must be equal, and the total number of turns of the primary winding of the transformer is: the secondary turns are b1 and the turn ratio N= (a1+a2)/b 1, and the turn ratio of the transformer can be flexibly set to achieve the effect of converting the primary voltage.
As shown in fig. 4, the synonym ends P1 and P4 of NP1 and NP2 are electrically connected to the outside, the synonym ends P2 and P3 are connected, and the synonym ends S1, S3, S5 of NS1, NS2, NS3 are connected in parallel to the outside to form an electrical connection, and the synonym ends S2, S4, S6 are connected in parallel to the outside to form an electrical connection.
By adopting the winding method, leakage inductance between the primary winding and the secondary winding of the transformer can be effectively reduced, surge current and peak voltage caused by the leakage inductance are reduced, oscillation caused by the leakage inductance and a distributed capacitor is inhibited, electromagnetic interference is reduced, and the loss of the transformer is reduced.
Those of skill in the art will appreciate that the various operations, methods, steps in the flow, actions, schemes, and alternatives discussed in the present application may be alternated, altered, combined, or eliminated. Further, other steps, means, or steps in a process having various operations, methods, or procedures discussed in this application may be alternated, altered, rearranged, split, combined, or eliminated. Further, steps, measures, schemes in the prior art with various operations, methods, flows disclosed in the present application may also be alternated, altered, rearranged, decomposed, combined, or deleted.
The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (4)
1. A method for reducing leakage inductance of a high frequency transformer, comprising the steps of:
dividing a primary winding group of the high-frequency transformer into at least 2 windings and connecting different name ends in series;
dividing a secondary winding component of the high-frequency transformer into at least 3 windings and connecting the same-name ends in parallel; the number of turns of each secondary winding is the same;
and the primary winding and the secondary winding are wound on the framework in a staggered manner.
2. The method of reducing leakage inductance of a high frequency transformer according to claim 1, wherein in the step of winding the primary winding and the secondary winding alternately on the bobbin, a first secondary winding is disposed inside a shield winding disposed at one end of the entire high frequency transformer winding.
3. The method for reducing leakage inductance of a high frequency transformer according to claim 2, wherein the shield winding is made of copper foil, and both ends of the copper foil are insulated.
4. The method of reducing leakage inductance of a high frequency transformer according to claim 1, wherein in the step of staggering the primary winding and the secondary winding around the bobbin, each winding is isolated by an insulating tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310564937.0A CN116435065A (en) | 2023-05-19 | 2023-05-19 | Method for reducing leakage inductance of high-frequency transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310564937.0A CN116435065A (en) | 2023-05-19 | 2023-05-19 | Method for reducing leakage inductance of high-frequency transformer |
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| CN116435065A true CN116435065A (en) | 2023-07-14 |
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| CN202310564937.0A Pending CN116435065A (en) | 2023-05-19 | 2023-05-19 | Method for reducing leakage inductance of high-frequency transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116612960A (en) * | 2023-07-21 | 2023-08-18 | 深圳平创半导体有限公司 | LLC magnetic integration high-frequency transformer |
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- 2023-05-19 CN CN202310564937.0A patent/CN116435065A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116612960A (en) * | 2023-07-21 | 2023-08-18 | 深圳平创半导体有限公司 | LLC magnetic integration high-frequency transformer |
| CN116612960B (en) * | 2023-07-21 | 2023-12-12 | 深圳平创半导体有限公司 | LLC magnetic integration high-frequency transformer |
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