CN215342269U - High stability transformer structure - Google Patents
High stability transformer structure Download PDFInfo
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- CN215342269U CN215342269U CN202120576752.8U CN202120576752U CN215342269U CN 215342269 U CN215342269 U CN 215342269U CN 202120576752 U CN202120576752 U CN 202120576752U CN 215342269 U CN215342269 U CN 215342269U
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Abstract
The utility model discloses a high-stability transformer structure which comprises a framework, a magnetic core, a winding and a fixing adhesive tape, wherein the magnetic core, the winding and the fixing adhesive tape are matched with the framework, and the winding is provided with an insulating shielding adhesive tape and a second shielding winding. The common-mode noise of the transformer can be effectively reduced by arranging the insulation shielding adhesive tape and the second shielding winding.
Description
Technical Field
The utility model relates to the field of switching power supplies, in particular to a high-stability transformer structure.
Background
As the switching frequency is continuously increased, the electromagnetic compatibility (EMC) of the switching power supply, which is a product widely popularized in modern life and industry, also becomes one of important parameters that are more and more concerned by people, the problem of the electromagnetic compatibility mainly comes from electromagnetic interference (EMI) noise, and can be mainly divided into common mode interference and differential mode interference according to the mode of the electromagnetic compatibility, and in practical application, most of the switching power supplies with unqualified electromagnetic compatibility are caused by the fact that the common mode interference cannot be well suppressed. In the switching power supply, the interlayer capacitance of the transformer generates a common mode current under a high-frequency working condition, and further generates common mode noise, and the common mode noise generated by the transformer is a main source of the common mode noise of the switching power supply.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a high-stability transformer structure which has the characteristic of low common-mode noise.
In order to achieve the above purpose, the solution of the utility model is:
a high-stability transformer structure comprises a framework, a magnetic core, a winding and a fixing adhesive tape; the framework comprises a pin part and a framework main body arranged on the pin part; a first pin, a second pin, a third pin, a fourth pin and a fifth pin are arranged on one side of the pin part, a sixth pin and a seventh pin are arranged on the other side of the pin part, and a mounting hole with two through ends is formed in the framework main body; the magnetic cores comprise a first E-shaped magnetic core and a second E-shaped magnetic core, and a center pillar of the first E-shaped magnetic core and a center pillar of the second E-shaped magnetic core penetrate into the mounting hole of the framework main body from two ends of the mounting hole respectively; the winding comprises a primary winding, a first insulating tape, a combined winding, a second insulating tape, a secondary winding, an insulating shielding tape, a second shielding winding and a third insulating tape which are wound on the outer side of the framework main body in sequence; the wire head and the wire tail of the primary winding are respectively connected with the fourth pin and the fifth pin; the combined winding comprises an auxiliary winding and a first shielding winding which are wound together, the head and the tail of the auxiliary winding are respectively connected with the second pin and the first pin, and the head and the tail of the first shielding winding are respectively connected with the first pin and the third pin; the wire head and the wire tail of the secondary winding are respectively connected with the sixth pin and the seventh pin; the winding mode of the second shielding winding is centered close winding, the wire head and the wire tail of the second shielding winding are respectively connected with the first pin and the third pin, the first pin is used for grounding, and the third pin is connected in a space-time mode when in use;
the fixing tape is wound around the outer peripheries of the first E-shaped magnetic core and the second E-shaped magnetic core.
The number of winding turns of the insulation shielding adhesive tape is 2.
The number of winding turns of the second shielding winding is 10, and the diameter of an enameled wire of the second shielding winding is 0.16 mm.
And the first E-shaped magnetic core and the second E-shaped magnetic core of the magnetic core are electrically conducted with the first pin.
The fixing adhesive tape wraps a conductive wire which is in contact with the outer side of the first E-shaped magnetic core and the outer side of the second E-shaped magnetic core, and the conductive wire is connected with the first pin.
After the scheme is adopted, the insulating shielding adhesive tape is arranged, namely an absorption capacitor is introduced to the primary side of the transformer to absorb leakage inductance energy of the transformer, and therefore common mode noise of the transformer is reduced. One end of the second shielding winding is grounded through the first pin when the transformer is used, and the second shielding winding adopts a winding mode of central close winding, so that the interlayer capacitance generated between the primary winding and the secondary winding can be reduced, and further, the common mode noise generated by the interlayer capacitance between the primary winding and the secondary winding is reduced, and the common mode noise of the transformer is reduced.
Drawings
Fig. 1 is a side view of the present invention.
Fig. 2 is a bottom view of the present invention.
Fig. 3 is a cross-sectional view of the present invention.
Description of reference numerals:
a frame 1, a lead part 11, a first lead 111, a second lead 112, a third lead 113, a fourth lead 114, a fifth lead 115, a sixth lead 116, a seventh lead 117,
the frame body 12, the mounting hole 121,
a winding 2, a primary winding 21, a first insulating tape 22, a combined winding 23, an auxiliary winding 231, a first shielding winding 232, a second insulating tape 24, a secondary winding 25, an insulating shielding tape 26, a second shielding winding 27, a third insulating tape 28,
a magnetic core 3, a first E-shaped magnetic core 31, a second E-shaped magnetic core 32,
the adhesive tape 4 is fixed.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
As shown in fig. 1 to 3, the present invention discloses a high-stability transformer structure, which includes a bobbin 1, and a winding 2, a magnetic core 3, and a fixing tape 4 fitted on the bobbin 1.
As shown in fig. 1 to 3, the frame 1 includes a lead 11 and a frame body 12 disposed on the lead 11; a first pin 111, a second pin 112, a third pin 113, a fourth pin 114 and a fifth pin 115 are arranged on one side of the pin part 11, a sixth pin 116 and a seventh pin 117 are arranged on the other side of the pin part 11, and a mounting hole 121 with two through ends is arranged on the framework body 12; the first pin 111 is used for grounding, and the third pin 113 is idle when in use.
As shown in fig. 3, the core 3 includes a first E-shaped core 31 and a second E-shaped core 32, the center leg of the first E-shaped core 31 and the center leg of the second E-shaped core 32 penetrate into the mounting hole 121 of the frame body 12 from both ends of the mounting hole, respectively, and the fixing tape 4 is wound around the outer peripheries of the first E-shaped core 31 and the second E-shaped core 32 to stably fix the first E-shaped core 31 and the second E-shaped core 32 to the frame body 12.
As shown in fig. 3, the winding 2 includes a primary winding 21, a first insulating tape 22, a combined winding 23, a second insulating tape 24, a secondary winding 25, an insulating shielding tape 26, a second shielding winding 27, and a third insulating tape 28, which are sequentially wound on the outer side of the framework main body 12; the head and the tail of the primary winding 21 are respectively connected with the fourth pin 114 and the fifth pin 115, the combined winding 23 comprises an auxiliary winding 231 and a first shielding winding 232 which are wound together, the auxiliary winding 231 and the first shielding winding 232 are wound together, that is, enameled wires of the auxiliary winding 231 and the first shielding winding 232 are wound together, the head and the tail of the auxiliary winding 231 are respectively connected with the second pin 112 and the first pin 111, the head and the tail of the first shielding winding 231 are respectively connected with the first pin 111 and the third pin 113, the head and the tail of the second shielding winding 27 are respectively connected with the first pin 111 and the third pin 113, and the head and the tail of the secondary winding 25 are respectively connected with the sixth pin 116 and the seventh pin 117. In the winding 2 of the present invention, the winding manner of the primary winding 21 may be close-wound three layers, the winding manner of the auxiliary winding 231 and the first shielding winding 232 of the combined winding 23 may be uniform close-wound one layer, the winding manner of the secondary winding 25 may be close-wound one layer, the number of winding turns of the first insulating tape 22 may be one, the number of winding turns of the second insulating tape 24 may be 2, and the number of winding turns of the third insulating tape 28 may be 2; the number of turns of the insulation shielding tape 26 can be 2, and the second shielding winding 27 is wound in a centered and close-wound manner.
The key to the utility model is to provide an insulating and shielding tape 26 and a second shielding winding 27 between the secondary winding 2 and a third insulating tape 28. The insulating shielding adhesive tape 26 is arranged, so that leakage inductance energy of the transformer is absorbed by introducing an absorption capacitor to the primary side of the transformer, and common mode noise of the transformer is reduced; through tests, the insulation shielding adhesive tape 26 has the best leakage inductance energy absorption for the transformer when the winding number of turns is 2. One end of the second shielding winding 27 is grounded through the first pin 111 when the transformer is used, and the second shielding winding 27 adopts a winding mode of central close winding, so that the second shielding winding 27 can improve the equivalent center distance of interlayer capacitance generated between the primary winding 21 and the secondary winding 25, thereby reducing the interlayer capacitance generated between the primary winding 21 and the secondary winding 25, further reducing the common mode noise generated by the interlayer capacitance between the primary winding 21 and the secondary winding 25, and reducing the common mode noise of the transformer; through tests, when the number of winding turns of the second shielding winding 27 is 10 and the diameter of the enameled wire of the second shielding winding 27 is 0.16 mm, the second shielding winding 27 can effectively reduce interlayer capacitance generated between the primary winding 21 and the secondary winding 25.
In the present invention, the first E-core 31 and the second E-core 31 of the core 3 can be electrically conducted with the fourth pin 114, so that the first E-core 31 and the second E-core 31 are grounded through the first pin 111 when the transformer is in use, and thus the capacitances of the first E-core 31 and the second E-core 31 to the ground are infinite, so that the first E-core 31 and the second E-core 31 do not generate a common mode current, that is, the first E-core 31 and the second E-core 31 do not generate a common mode noise; the fixing tape 4 covers a conductive wire contacting with the outer sides of the first E-shaped magnetic core 31 and the second E-shaped magnetic core 32, the conductive wire electrically connects the first E-shaped magnetic core 31 and the second E-shaped magnetic core 32, and the conductive wire is connected to the first pin 111 to electrically connect the first E-shaped magnetic core 31 and the second E-shaped magnetic core 31 to the first pin 111.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.
Claims (5)
1. A high stability transformer structure which characterized in that: comprises a framework, a magnetic core, a winding and a fixing adhesive tape;
the framework comprises a pin part and a framework main body arranged on the pin part; a first pin, a second pin, a third pin, a fourth pin and a fifth pin are arranged on one side of the pin part, a sixth pin and a seventh pin are arranged on the other side of the pin part, and a mounting hole with two through ends is formed in the framework main body;
the magnetic cores comprise a first E-shaped magnetic core and a second E-shaped magnetic core, and a center pillar of the first E-shaped magnetic core and a center pillar of the second E-shaped magnetic core penetrate into the mounting hole of the framework main body from two ends of the mounting hole respectively;
the winding comprises a primary winding, a first insulating tape, a combined winding, a second insulating tape, a secondary winding, an insulating shielding tape, a second shielding winding and a third insulating tape which are wound on the outer side of the framework main body in sequence; the wire head and the wire tail of the primary winding are respectively connected with the fourth pin and the fifth pin; the combined winding comprises an auxiliary winding and a first shielding winding which are wound together, the head and the tail of the auxiliary winding are respectively connected with the second pin and the first pin, and the head and the tail of the first shielding winding are respectively connected with the first pin and the third pin; the wire head and the wire tail of the secondary winding are respectively connected with the sixth pin and the seventh pin; the winding mode of the second shielding winding is centered close winding, the wire head and the wire tail of the second shielding winding are respectively connected with the first pin and the third pin, the first pin is used for grounding, and the third pin is connected in a space-time mode when in use;
the fixing tape is wound around the outer peripheries of the first E-shaped magnetic core and the second E-shaped magnetic core.
2. A high stability transformer structure according to claim 1, characterized in that: the number of winding turns of the insulation shielding adhesive tape is 2.
3. A high stability transformer structure according to claim 1, characterized in that: the number of winding turns of the second shielding winding is 10, and the diameter of an enameled wire of the second shielding winding is 0.16 mm.
4. A high stability transformer structure according to claim 1, characterized in that: and the first E-shaped magnetic core and the second E-shaped magnetic core of the magnetic core are electrically conducted with the first pin.
5. A high stability transformer structure according to claim 4, characterized in that: the fixing adhesive tape wraps a conductive wire which is in contact with the outer side of the first E-shaped magnetic core and the outer side of the second E-shaped magnetic core, and the conductive wire is connected with the first pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120576752.8U CN215342269U (en) | 2021-03-22 | 2021-03-22 | High stability transformer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120576752.8U CN215342269U (en) | 2021-03-22 | 2021-03-22 | High stability transformer structure |
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| Publication Number | Publication Date |
|---|---|
| CN215342269U true CN215342269U (en) | 2021-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120576752.8U Active CN215342269U (en) | 2021-03-22 | 2021-03-22 | High stability transformer structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023216757A1 (en) * | 2022-05-10 | 2023-11-16 | 华为数字能源技术有限公司 | Shielding apparatus and electrical device |
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2021
- 2021-03-22 CN CN202120576752.8U patent/CN215342269U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023216757A1 (en) * | 2022-05-10 | 2023-11-16 | 华为数字能源技术有限公司 | Shielding apparatus and electrical device |
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