CN111312496B - Transformer capable of adjusting common mode and common mode adjusting method thereof - Google Patents
Transformer capable of adjusting common mode and common mode adjusting method thereof Download PDFInfo
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- CN111312496B CN111312496B CN202010200439.4A CN202010200439A CN111312496B CN 111312496 B CN111312496 B CN 111312496B CN 202010200439 A CN202010200439 A CN 202010200439A CN 111312496 B CN111312496 B CN 111312496B
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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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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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
- H01F27/288—Shielding
- H01F27/2885—Shielding with shields or electrodes
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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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- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
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- Regulation Of General Use Transformers (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
The invention discloses a transformer with an adjustable common mode, which comprises a framework, a magnetic core, at least one primary winding, at least one shielding layer winding and at least one secondary winding, wherein the magnetic core is arranged on the framework; the primary winding, the shielding layer winding and the secondary winding are wound on the framework according to design requirements; the shielding layer winding comprises at least two sections of coils; adjacent coils are connected through taps; according to the transformer with the adjustable common mode and the common mode adjusting method thereof, the area and the shielding position of the shielding layer winding are adjusted by cutting off the taps among the shielding layer winding coils, so that the common mode value of the transformer is adjusted, the common mode value of the transformer with the common mode value biased to be negative or positive reaches a specified range, the scrapping of all transformers with poor common mode values is not needed, the production cost is saved, and the working efficiency is improved.
Description
Technical Field
The invention relates to the technical field of common modes of transformers, in particular to an adjustable common mode transformer and a common mode adjusting method thereof.
Background
The transformer realizes voltage conversion by utilizing the principle of electromagnetic induction, the input end of the actual high-frequency transformer is a rectified direct-current square wave, and the main components are a primary coil, a secondary coil and an iron core (magnetic core). The main functions are as follows: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformers), and the like.
The common mode failure problem often occurs in the use process of the existing transformer, so that a plurality of problems occur, and the common mode value of a sample is changed by adjusting the area of a shielding layer, the thickness of an insulating layer and other methods when the conventional transformer is used for testing the sample, so that the common mode value reaches a specified range. However, even if the common mode value of the same model sample meets the requirement, when mass production is performed, because the winding tightness or the density of each transformer shielding layer and insulating layer is different, the common mode value of the mass production transformers is poor, and the transformers with poor common mode value can only be scrapped, so that the resource waste is caused.
Disclosure of Invention
The invention provides a transformer capable of adjusting a common mode and a common mode adjusting method thereof.
An adjustable common mode transformer comprises a framework, a magnetic core, at least one primary winding, at least one shielding layer winding and at least one secondary winding, wherein the magnetic core is arranged on the framework; the primary winding, the shielding layer winding and the secondary winding are wound on the framework according to design requirements; the shielding layer winding comprises at least two sections of coils; adjacent coils are connected through taps.
In one embodiment, the shield winding is located between the primary winding and the secondary winding.
In one embodiment, the shield winding is a copper wire winding.
In one embodiment, the taps and the coils are connected in series by wires of the same material.
A method for regulating the common mode of a transformer,
the first step: obtaining a common mode value of a transformer;
and a second step of: judging whether the common-mode voltage value is in a preset common-mode value range or not;
and a third step of: classifying transformers exceeding a preset common mode value according to deviation positive values or negative values;
fourth step: cutting off the single positive or negative bias transformer shield winding coil taps 30, respectively;
fifth step: testing the common mode value of the transformer with the cut tap;
sixth step: judging whether the common mode value of the single transformer biased to a positive value or a negative value is in a preset range;
seventh step: if yes, the whole group is reserved, otherwise, the whole group is scrapped.
In one embodiment, the number of turns of the shear coil is set according to the type of transformer.
According to the transformer with the adjustable common mode and the common mode adjusting method thereof, the area and the shielding position of the shielding layer winding are adjusted by cutting off the taps among the shielding layer winding coils, so that the common mode value of the transformer is adjusted, the common mode value of the transformer with the common mode value biased to be negative or positive reaches a specified range, the scrapping of all transformers with poor common mode values is not needed, the production cost is saved, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a shielding layer winding coil tap of an adjustable common mode transformer according to an embodiment of the present invention before cutting;
FIG. 2 is a schematic diagram of a split structure of a winding coil tap of a shielding layer of the transformer of FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a cross-sectional structure of the shielding layer winding coil tap of the adjustable common mode transformer of FIG. 1 before cutting;
fig. 4 is a schematic cross-sectional view of a winding coil tap of a shielding layer of the transformer of fig. 2 with an adjustable common mode according to an embodiment of the present invention after being cut.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all 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. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, an adjustable common mode transformer comprises a bobbin 10, a magnetic core, at least one primary winding, at least one shielding layer winding 20, at least one secondary winding, the magnetic core being mounted on the bobbin 10; the primary winding, the shielding layer winding 20 and the secondary winding are wound on the framework 10 according to design requirements; the shield winding 20 comprises at least two sections of coils; adjacent coils are connected by taps 30.
In one embodiment, the shield winding 20 is located between the primary winding and the secondary winding.
In one embodiment, the shield windings 20 are copper wire windings.
In one embodiment, the taps 30 are connected in series with the coil using wires of the same material.
As shown in fig. 2, 3 and 4, the common mode adjustment method of the transformer,
the first step: obtaining a common mode value of a transformer;
and a second step of: judging whether the common-mode voltage value is in a preset common-mode value range or not;
and a third step of: classifying transformers exceeding a preset common mode value according to deviation positive values or negative values;
fourth step: cutting off the coil taps 30 of the single positive or negative bias transformer shield winding 20, respectively;
fifth step: testing the common mode value of the transformer of the shear tap 30;
sixth step: judging whether the common mode value of the single transformer biased to a positive value or a negative value is in a preset range;
seventh step: if yes, the whole group is reserved, otherwise, the whole group is scrapped.
In the prior art, when the common mode value of the transformer is measured during the preparation of a sample and the common mode value reaches a preset range by adjusting the area of a shielding layer of the transformer, the area of a shielding layer winding of the transformer is also determined, in this case, the shielding layer winding of the transformer is usually formed by a section of continuous coil, one end of the winding is grounded after the area of the shielding layer winding is determined, and the other end of the winding is wound on a pin needle or a framework, and then mass production is performed.
The mode that this application adopted is for making the sample with the shielding layer winding of transformer for two sections at least coils, connects through taking a percentage 30 between the adjacent coil, takes a percentage 30 material and the material of coil for the same material, then begins batch production.
When the mass production is completed, the common-mode voltage value of a large number of transformers is required to be detected, for example, an oscilloscope obtains the common-mode voltage value and acquires a voltage waveform.
Detecting whether the common mode value of each transformer is within a preset value range, and if the representation within the preset value range meets the requirements, placing the transformer at the storage position of the good product. If the voltage waveform of the common mode value exceeds the range of the preset value, judging that the common mode voltage value is deviated to the positive direction or the negative direction, and dividing the transformers for deviating the common mode value to the positive direction and the negative direction into two groups, namely a group of common mode value deviating to the positive direction and a group of common mode value deviating to the negative direction. And (3) taking out one transformer at will from one group with the common mode value deviating from the positive direction and one group with the common mode value deviating from the negative direction, cutting off the tap 30, respectively testing the common mode value of the two transformers of the cut tap 30, wherein the group where the transformers with the common mode value within the preset range are tested is a good group, all the transformers in the whole good group cut off the tap 30, and putting the other group into a good storage place for scrapping.
The test results are shown in Table 1-1.
Test model: 10-PQ2011V1020-XXX test item: common mode unit: mV (mV)
Common mode specification: -test quantity of 28mV to +39 mV: 100 pieces of
Test data
| 7.89 | 4.3 | -21.3 | -21.26 | -24.81 | 4.03 | 11.31 | -24.18 | 27.48 | -53.92 |
| -7.92 | 10.5 | -24 | 11.76 | -26.7 | -9.45 | 50.12 | 10.05 | -19.15 | 29.91 |
| 8.61 | 12.39 | 41.32 | 32.51 | -12.23 | 12.39 | 12.75 | 23.26 | -54.1 | 6.64 |
| 4.03 | 21.64 | 3.85 | 22.45 | 3.22 | -14.39 | -16.18 | 25.68 | -10.43 | 13.2 |
| -13.67 | 9.6 | -43.77 | -8.73 | -11.96 | -37.3 | -8.82 | 31.7 | 27.57 | 3.32 |
| 19.84 | 1.52 | 12.75 | -4.95 | 9.96 | 8.25 | 39.37 | -35.4 | -15.91 | 29.1 |
| 4.84 | 2.59 | 18.23 | -32.36 | -33.7 | 29.82 | 26.31 | 3.04 | -19.15 | -21.93 |
| 8.07 | 38.26 | -18.34 | 16.25 | 14.72 | -23.82 | 23.17 | 41.66 | -21.84 | 6.37 |
| 39.07 | 22.18 | 22.54 | 3.04 | 19.57 | 4.03 | -8.37 | -11.78 | 13.73 | 19.3 |
| 36.64 | -6.84 | -7.02 | 10.32 | 2.05 | -25.11 | 6.64 | 52.82 | 10.86 | 9.95 |
1-1
The number of transformers with the common mode value exceeding the upper limit is 6, the number of transformers with the common mode value exceeding the lower limit is 7, after the transformers with the bias to the negative value are measured and the taps 30 are cut off, the common mode value reaches the preset common mode value, good product processing is carried out, the number of transformers with the common mode value exceeding the upper limit is 6, scrapping processing is carried out, and the number of transformers with the common mode value exceeding the lower limit is 7. The 7 transformers with common mode values exceeding the lower limit are retested to obtain the results shown in the table 1-2:
| original common mode value | Common mode value after shearing |
| -54.1 | -26.1 |
| -43.77 | -21.2 |
| -32.36 | -17.6 |
| -53.92 | -25.2 |
| -35.4 | -15.2 |
| -33.7 | -16.7 |
| -37.3 | -18.1 |
1-2
The number of turns that this model transformer subtracts is 0.6 circle, through experimental verification, reduces suitable number of turns and can make common mode value skew positive value, surpasses the lower limit and has 7% defective rate, through cutting the regulation department, tests again, and the numerical value accords with the standard entirely, promotes the product yields.
According to the transformer with the adjustable common mode and the common mode adjusting method thereof, the area and the shielding position of the shielding layer winding 20 are adjusted by cutting off the tap 30 between the coils of the shielding layer winding 20, so that the common mode value of the transformer is adjusted, the common mode value of the transformer with the common mode value biased to be negative or positive reaches a specified range, the scrapping of all transformers with poor common mode values is not needed, the production cost is saved, and the working efficiency is improved.
In one embodiment, the number of turns of the shear coil is set according to the type of transformer.
In order to more rapidly complete the adjustment of the common mode value, the number of turns of the cut coil of the transformer with the same model is determined in advance, the coil with the preset length is reserved before design, when the tap 30 is required to be cut, the tap 30 is directly cut, the working efficiency is improved, and the situation that the number of turns of the coil is misplaced to cause rejection of the transformer is avoided.
As can be seen from the transformer principle, the voltage difference Δvps between the primary winding Np and the secondary winding Ns of the transformer forms a parasitic capacitance Cps through the gap of the layer, and forms a common mode current Ips from the primary to the secondary direction on the interlayer capacitance Cps; i.e. ips=qps/t=cps. Parasitic capacitance Cps exists between the primary winding Np and the secondary winding Ns, the moving point of the primary winding has higher high-frequency voltage, and in high-frequency on-off, a common-mode current channel is formed by taking the parasitic capacitance between the primary winding Np and the secondary winding Ns as a channel, so that the primary voltage is coupled to the secondary.
The voltage difference between the secondary winding Ns and the shielding layer winding E1 is Δve1s, a first interlayer capacitance CE1s is formed, and a common mode current IsE1 from the secondary to the primary direction is formed on the first interlayer capacitance CE1 s;
namely: isE1 = QsE 1/t=ce 1s Δve1s/t.
When ips= IsE1, the transformer structure achieves the purpose of eliminating common mode noise. The common mode voltage at this time is also zero according to the formula u=ir. When the common-mode voltage U exceeds a preset voltage value, the voltage value is determined to be biased in a positive direction or a negative direction through waveforms, and then targeted adjustment is performed. According to the formula c=εs/4pi kd, ε is the dielectric constant, S: positive electrode plate area, k: electrostatic force constant, d: the distance between the polar plates. That change in the value of parasitic capacitance Cps or an interlayer capacitance CE1S generally requires a change in S: polar plate facing area or d: the distance between the polar plates.
For example: when the common-mode voltage U exceeds a preset voltage value, the winding turns of the shielding layer winding E1 are reduced, the positive area of a polar plate between the secondary winding Ns and the shielding layer winding E1 is reduced, and CE1S is reduced according to a formula CE1s=epsilon S/4 pi kd; the facing area between the primary winding Np and the secondary winding Ns is increased, and Qps and QsE1 are in opposite charge directions, i.e., cps x Δvps=ce 1s x Δve1s, so that the common-mode voltage value is biased to the positive direction, and the common-mode voltage value reaches the preset voltage range according to the principle of charge mutual neutralization, so that the common-mode voltage value of the transformer reaches the ideal value, and common-mode noise is eliminated.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. The common mode adjustment method of the transformer is characterized by comprising the following steps of:
the transformer comprises a framework, a magnetic core, at least one primary winding, at least one shielding layer winding and at least one secondary winding, wherein the magnetic core is arranged on the framework; the primary winding, the shielding layer winding and the secondary winding are wound on the framework according to design requirements; the shielding layer winding comprises at least two sections of coils; adjacent coils are connected through taps;
the first step: obtaining a common mode value of a transformer;
and a second step of: judging whether the common-mode voltage value is in a preset common-mode value range or not;
and a third step of: classifying transformers exceeding a preset common mode value according to deviation positive values or negative values;
fourth step: cutting off the winding taps of the shielding layer winding of the transformer with single deflection positive value or negative value respectively;
fifth step: testing the common mode value of the transformer with the cut tap;
sixth step: judging whether the common mode value of the single transformer biased to a positive value or a negative value is in a preset range;
seventh step: if yes, reserving the whole group, otherwise, scrapping the whole group;
when the common-mode voltage U exceeds a preset voltage value and deviates to the negative direction, the winding turns of the shielding layer winding E1 are reduced, and the opposite area of a polar plate between the secondary winding Ns and the shielding layer winding E1 is reduced; the shield winding is located between the primary winding and the secondary winding.
2. The method of common mode adjustment of a transformer according to claim 1, wherein: the number of turns of the shear coil is set according to the type of the transformer.
3. The method of common mode adjustment of a transformer according to claim 1, wherein: the shielding layer winding is a copper wire winding.
4. The method of common mode adjustment of a transformer according to claim 1, wherein: the tap and the coil are connected in series by wires of the same material.
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| JP2015089181A (en) * | 2013-10-29 | 2015-05-07 | 株式会社東芝 | Rotary electric machine, coil and method of manufacturing coil |
| CN110310815A (en) * | 2019-06-14 | 2019-10-08 | 华为技术有限公司 | Flat surface transformer, power-switching circuit and adapter |
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| CN103474210A (en) * | 2013-08-27 | 2013-12-25 | 崧顺电子（深圳）有限公司 | Transformer resistant to common code interference |
| TW201523655A (en) * | 2013-12-06 | 2015-06-16 | Acbel Polytech Inc | Transformer and power supply circuit using same |
| EP3035349B1 (en) * | 2014-12-17 | 2018-09-05 | Nxp B.V. | A transformer |
| CN206834777U (en) * | 2017-04-28 | 2018-01-02 | 东莞市奥海科技股份有限公司 | Effectively reduce the low power charger of common-mode noise |
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| JP2015089181A (en) * | 2013-10-29 | 2015-05-07 | 株式会社東芝 | Rotary electric machine, coil and method of manufacturing coil |
| CN110310815A (en) * | 2019-06-14 | 2019-10-08 | 华为技术有限公司 | Flat surface transformer, power-switching circuit and adapter |
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