CN211578497U - High voltage-resistant common-mode inductor and common-mode filter - Google Patents
High voltage-resistant common-mode inductor and common-mode filter Download PDFInfo
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- CN211578497U CN211578497U CN202020449903.9U CN202020449903U CN211578497U CN 211578497 U CN211578497 U CN 211578497U CN 202020449903 U CN202020449903 U CN 202020449903U CN 211578497 U CN211578497 U CN 211578497U
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Abstract
The utility model discloses a high voltage resistance type common mode inductor and common mode filter, which relates to the technical field of electronic components, and comprises a magnetic ring and two groups of coils wound on the magnetic ring, wherein the surface of the magnetic ring is coated with an epoxy layer; the epoxy layer surface cladding has the insulating film, and the insulating film can be dismantled with the magnetic ring and be connected, and the coil is around locating the insulating film surface. The insulating film is made of polyvinyl fluoride. The utility model provides a reduce winding coil to the wearing and tearing of epoxy layer and the problem of destruction, have and prevent around the coil direct contact magnetic ring of establishing to promote the effect of common mode inductance and common mode filter's withstand voltage value.
Description
Technical Field
The utility model belongs to the technical field of the electronic components technique and specifically relates to a high withstand voltage type common mode inductance and common mode filter are related to.
Background
The common mode filter usually uses ferrite core, double line and parallel winding. The function is to eliminate the 'switching interference' peculiar to the switching power supply to ensure that the television itself and other equipment in the power grid are free from interference. Common mode filters are relatively simple in design, including common mode capacitance and common mode inductance. The common mode capacitor shunts current from the two input lines to ground, and current flowing through the common mode inductor presents a balanced impedance that presents an impedance characteristic to common mode noise.
As shown in fig. 1, the conventional common mode filter includes a common mode inductor and a common mode capacitor (not shown in the figure), the common mode inductor includes a magnetic ring 1, an epoxy layer 11 is coated on a surface of the magnetic ring 1, two groups of coils 12 are wound on the magnetic ring 1, turns and phases of the coils 12 are the same, and winding directions of the coils are opposite. The epoxy layer 11 on the surface of the magnetic ring 1 is generally used for forming insulation between the coil 12 and the magnetic ring 1, has excellent chemical corrosion resistance and mechanical property, can protect the magnetic ring 1 from being scratched and damaged easily, and reduces the electrostatic action among the annular magnetic sheets 2, so that the whole filter device has a better filtering effect.
The above prior art solutions have the following drawbacks: when the coil is wound on the magnetic ring, the epoxy resin layer on the surface of the magnetic ring is easy to damage or be damaged due to the friction between the coil and the magnetic ring, so that the coil can be in direct contact with the magnetic ring, when the coil is connected with a large current, the inductance is easy to damage, and the withstand voltage value of the filter is not up to the standard.
SUMMERY OF THE UTILITY MODEL
According to the not enough that prior art exists, one of the purposes of the utility model is to provide a high withstand voltage type common mode inductance has and reduces the coil and wears and destroys the epoxy layer when establishing to reduce or prevent coil direct contact magnetic ring, and then reduce the effect to the damage of inductance.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a high voltage resistance type common mode inductor comprises a magnetic ring and two groups of coils wound on the magnetic ring, wherein the surface of the magnetic ring is coated with an epoxy layer; the surface of the epoxy layer is coated with an insulating film, the insulating film is detachably connected with the magnetic ring, and the coil is wound on the surface of the insulating film.
By adopting the technical scheme, the insulating film is used for insulating and packaging the outer surface of the magnetic ring, so that the abrasion and damage of the winding of the coil to the epoxy resin layer can be reduced or prevented, and the coil is prevented from directly contacting the magnetic ring; meanwhile, the impact of overlarge current on the inductor can be reduced or avoided, and further the damage to the inductor is reduced.
The present invention may be further configured in a preferred embodiment as: the insulating film is made of polyvinyl fluoride.
By adopting the technical scheme, the polyvinyl fluoride has excellent voltage resistance, and the damage of current to the inductor can be reduced; meanwhile, the magnetic ring has the characteristic of strong adhesion to metal, can be well coated on the outer surface of the magnetic ring, and can play a good insulating role.
The present invention may be further configured in a preferred embodiment as: the insulating film comprises a first insulating part and a second insulating part which are symmetrically arranged, and further comprises an outer insulating ring and an inner insulating ring, wherein the first insulating part and the second insulating part are matched and sleeved on the surface of the magnetic ring;
the outer insulating ring and the inner insulating ring are both glued to the joint of the first insulating part and the second insulating part, the outer insulating ring is located at the outer ring of the magnetic ring, and the inner insulating ring is located at the inner ring of the magnetic ring.
Through adopting above-mentioned technical scheme, first insulating part and second insulating part are used for the whole surface of cladding magnetic ring, and outer insulating circle and interior insulating circle are with the seam crossing that joins first insulating part and second insulating part to reach the effect of being convenient for install and dismantle the insulating layer.
The present invention may be further configured in a preferred embodiment as: the magnetic ring comprises more than two annular magnetic sheets, and the magnetic conductivity of each annular magnetic sheet is different.
By adopting the technical scheme, the magnetic materials with different magnetic conductivities are combined and superposed in different ways, and a higher band-stop frequency interval can be realized by winding the coil, so that the filtering efficiency of the common-mode inductor is improved.
The present invention may be further configured in a preferred embodiment as: the thickness of the annular magnetic sheet is 4-8 mm.
By adopting the technical scheme, the annular magnetic sheet is thinner, and the requirements of miniaturization and thinning of the common-mode inductor can be met after the annular magnetic sheet is overlapped.
The present invention may be further configured in a preferred embodiment as: the inner diameter and the outer diameter of each annular magnetic sheet are equal, a protruding portion is arranged at the bottom end of each annular magnetic sheet, a groove portion is arranged at the top end of each annular magnetic sheet, and the protruding portions and the groove portions of the adjacent annular magnetic sheets are mutually embedded.
Through adopting above-mentioned technical scheme, adopt the annular magnetic sheet that internal diameter and external diameter are the same to make things convenient for the wire winding, and protruding portion and the mutual gomphosis of concave part can make it difficult emergence relative dislocation between every annular magnetic sheet when the wire winding.
The present invention may be further configured in a preferred embodiment as: still include the base, four angular point departments of base are equipped with the stitch, the beginning of coil, terminal respectively with four stitch fixed connection.
Through adopting above-mentioned technical scheme, the setting of base can be more convenient installs whole common mode inductance in other electrical apparatus, makes things convenient for actual installation to use.
The present invention may be further configured in a preferred embodiment as: the magnetic ring is characterized in that an installation part is arranged at the top of the base, an installation groove is formed in one side, facing the magnetic ring, of the installation part, and one side of the magnetic ring is embedded in the installation groove.
Through adopting above-mentioned technical scheme, installation department and mounting groove can laminate each other with magnetic ring one side to can make things convenient for the holistic installation of common mode inductance, make it difficult for taking place relative slip, and can make the structure compacter.
According to the deficiencies of the prior art, it is another object of the present invention to provide a common mode filter having an effect of improving a withstand voltage of the common mode filter using a common mode inductor.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a common mode filter comprises a common mode capacitor and the common mode inductor, wherein the common mode capacitor is communicated with the common mode inductor.
By adopting the technical scheme, the common mode inductor has better voltage withstanding characteristic, so that the damage of the current output by the common mode capacitor to the common mode inductor is reduced, and the voltage withstanding value of the common mode filter is improved.
To sum up, the utility model discloses a following at least one useful technological effect:
1. through the arrangement of the insulating film, the effect of preventing the coil from directly contacting the magnetic ring, reducing the damage of current to the inductor and further improving the withstand voltage value of the filter can be achieved;
2. through the arrangement of the first insulating part, the second insulating part, the outer insulating ring and the inner insulating ring, the insulating layer can be conveniently installed and detached, and the impact of overlarge current on the inductor can be reduced or avoided;
3. through the arrangement of a plurality of magnetic sheets with different magnetic conductivities, a higher band-stop frequency interval can be realized, so that the filtering efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a common mode inductor in the prior art.
Fig. 2 is a schematic diagram of the overall structure of the common mode inductor according to the present invention.
Fig. 3 is an exploded view of the magnetic ring in this embodiment 1.
In the figure, 1, a magnetic ring; 11. an epoxy layer; 12. a coil; 2. an annular magnetic sheet; 21. a boss portion; 22. a groove part; 3. an insulating film; 31. a first insulating portion; 32. a second insulating section; 33. an outer insulating ring; 34. an inner insulating ring; 4. a base; 41. an installation part; 42. mounting grooves; 43. and (4) stitching.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
referring to fig. 2, the utility model discloses a high withstand voltage type common mode inductance, including magnetic ring 1 and around locating two sets of coils 12 on magnetic ring 1, in order to play preliminary insulating effect, the coating of 1 surface of magnetic ring has epoxy layer 11, and coil 12 adopts the enameled wire. In this embodiment, the winding directions of the coil 12 are opposite, so that the current directions are opposite, and the parasitic inductance is offset conveniently, thereby reducing errors in the use process of the common mode inductance and facilitating better filtering effect.
Referring to fig. 2, further, in order to prevent the coil 12 from damaging the epoxy layer 11, the surface of the epoxy layer 11 is covered with the insulating film 3, and the insulating film 3 is detachably connected to the magnetic ring 1, and the coil 12 is wound on the surface of the insulating film 3. Preferably, the insulating film 3 in this embodiment is made of polyvinyl fluoride, and the polyvinyl fluoride can be tightly coated on the outer surface of the epoxy layer 11 of the magnetic ring 1 through its excellent pressure resistance and strong adhesion property specific to metal; and the polyvinyl fluoride material has excellent insulating property, and can reduce or avoid the impact of overlarge current on the common-mode inductor, thereby reducing the damage to the inductor.
Referring to fig. 2, in order to facilitate mounting and dismounting of the insulating film 3, the insulating film 3 includes an outer insulating ring 33, an inner insulating ring 34, and a first insulating portion 31 and a second insulating portion 32 that are symmetrically disposed, the first insulating portion 31 and the second insulating portion 32 are fitted and sleeved on the upper and lower surfaces of the magnetic ring 1, the outer insulating ring 33 is located at the outer ring of the magnetic ring 1 and glued at the joint between the first insulating portion 31 and the second insulating portion 32, and the inner insulating ring 34 is located at the inner ring of the magnetic ring 1 and also glued at the joint between the first insulating portion 31 and the second insulating portion 32.
Referring to fig. 2, in order to facilitate the installation of the common mode inductor, the present embodiment further includes a base 4, a mounting portion 41 is disposed on a top of the base 4, a mounting groove 42 is disposed on a side of the mounting portion 41 facing the magnetic ring 1, and a side of the magnetic ring 1 is embedded in the mounting groove 42. Four corners of the base 4 are provided with pins 43, and the start and end of the coil 12 are respectively welded with the four pins 43. Through base 4 for the whole difficult relative slip that takes place of common mode inductance can also make whole structure compacter simultaneously, touch the inductance can be convenient install on the electrical apparatus (not shown in the figure) that needs the filtering simultaneously.
Referring to fig. 2 and 3, in order to improve the bandwidth filtering interval of the common mode inductor, the magnetic ring 1 includes at least two annular magnetic sheets 2, and the thickness of each annular magnetic sheet 2 is 4mm to 8 mm. The number of the ring-shaped magnetic sheets 2 adopted in the embodiment is two, and the materials adopted by the two ring-shaped magnetic sheets 2 are respectively manganese zinc ferrite and nickel zinc ferrite. The manganese zinc ferrite has a filtering frequency range of hundreds of KHz to 10MHz, the nickel zinc ferrite has a filtering frequency range of 10MHz to hundreds of MHz, and the filter can have a bandwidth filtering interval of hundreds of KHz to hundreds of MHz after the two materials are overlapped and wound. Preferably, in order to make the two ring-shaped magnet pieces 2 fit tightly and facilitate the coating of the insulating layer, the inner diameter and the outer diameter of the ring-shaped magnet piece 2 are equal, the bottom end of the ring-shaped magnet piece 2 is provided with a protruding portion 21, the top end of the ring-shaped magnet piece 2 is provided with a groove portion 22, and the protruding portion 21 and the groove portion 22 of two adjacent ring-shaped magnet pieces 2 are embedded with each other to form a whole.
The implementation principle of the above embodiment is as follows: firstly, two annular magnetic sheets 2 with the same inner diameter and outer diameter are attached, and the protruding part 21 of one annular magnetic sheet 2 is embedded into the groove part 22 of the other annular magnetic sheet 2 to form a complete magnetic ring 1. Then, the first insulating portion 31 and the second insulating portion 32 are respectively fitted around the outer surfaces of the two ring-shaped magnetic pieces 2, and the outer insulating ring 33 and the inner insulating ring 34 are respectively adhered to the joint of the first insulating portion 31 and the second insulating portion 32. Then, two enameled wires are respectively wound on the magnetic ring 1 wrapped with the insulating layer, and the winding directions of the coils 12 formed by winding the two enameled wires are opposite. Finally, the magnetic ring 1 is embedded into the mounting groove 42 of the base 4, and the corresponding pins 43 at the beginning and the end of the two groups of coils 12 are welded and fixed.
Example 2:
a common mode filter, referring to fig. 2, includes a common mode capacitor and a common mode inductor in embodiment 1, and the common mode capacitor (not shown in the figure) is connected to the common mode inductor. When normal current in the circuit flows through the common-mode inductor from the common-mode capacitor, the current generates reverse magnetic fields in the coils 12 wound in the same phase to cancel each other out, and at the moment, the normal signal current is mainly influenced by the resistance of the coils 12 (and a small amount of damping caused by leakage inductance); when a common mode current flows through the coil 12, due to the common mode current's isotropy, an isotropic magnetic field is generated in the coil 12 to increase the inductive impedance of the coil, so that the coil 12 exhibits a high impedance and generates a strong damping effect, thereby attenuating the common mode current and achieving the purpose of filtering. The insulating film 3 can greatly increase the withstand voltage of the filter with the common mode inductor, and it is verified that the withstand voltage can be increased from 25000V to 30000V.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (9)
1. A high voltage resistance type common mode inductor comprises a magnetic ring (1) and two groups of coils (12) wound on the magnetic ring (1), wherein the surface of the magnetic ring (1) is coated with an epoxy layer (11); the method is characterized in that: the surface of the epoxy layer (11) is coated with an insulating film (3), the insulating film (3) is detachably connected with the magnetic ring (1), and the coil (12) is wound on the surface of the insulating film (3).
2. The high withstand voltage type common mode inductor according to claim 1, wherein: the insulating film (3) is made of polyvinyl fluoride.
3. The high withstand voltage type common mode inductor according to claim 1, wherein: the insulating film (3) comprises a first insulating part (31) and a second insulating part (32) which are symmetrically arranged, and further comprises an outer insulating ring (33) and an inner insulating ring (34), wherein the first insulating part (31) and the second insulating part (32) are matched and sleeved on the surface of the magnetic ring (1);
the outer insulating ring (33) and the inner insulating ring (34) are both glued to the joint of the first insulating part (31) and the second insulating part (32), the outer insulating ring (33) is located at the outer ring of the magnetic ring (1), and the inner insulating ring (34) is located at the inner ring of the magnetic ring (1).
4. The high withstand voltage type common mode inductor according to claim 1, wherein: the magnetic ring (1) comprises more than two annular magnetic sheets (2), and the magnetic conductivity of each annular magnetic sheet (2) is different.
5. The high withstand voltage type common mode inductor according to claim 4, wherein: the thickness of the annular magnetic sheet (2) is 4-8 mm.
6. The high withstand voltage type common mode inductor according to claim 4, wherein: the inner diameter and the outer diameter of the annular magnetic sheet (2) are equal, a protruding portion (21) is arranged at the bottom end of the annular magnetic sheet (2), a groove portion (22) is arranged at the top end of the annular magnetic sheet (2), and the protruding portion (21) and the groove portion (22) of the two adjacent annular magnetic sheets (2) are mutually embedded.
7. The high withstand voltage type common mode inductor according to claim 1, wherein: still include base (4), four angular point departments of base (4) are equipped with stitch (43), the beginning of coil (12), terminal respectively with four stitch (43) fixed connection.
8. The high withstand voltage type common mode inductor according to claim 7, wherein: the magnetic ring is characterized in that an installation part (41) is arranged at the top of the base (4), one side, facing the magnetic ring (1), of the installation part (41) is provided with an installation groove (42), and one side of the magnetic ring (1) is embedded in the installation groove (42).
9. A common-mode filter comprising a common-mode capacitor, characterized in that: the common mode inductor of any one of claims 1 to 7, wherein the common mode capacitor is in communication with the common mode inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020449903.9U CN211578497U (en) | 2020-03-31 | 2020-03-31 | High voltage-resistant common-mode inductor and common-mode filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020449903.9U CN211578497U (en) | 2020-03-31 | 2020-03-31 | High voltage-resistant common-mode inductor and common-mode filter |
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| CN211578497U true CN211578497U (en) | 2020-09-25 |
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| CN202020449903.9U Active CN211578497U (en) | 2020-03-31 | 2020-03-31 | High voltage-resistant common-mode inductor and common-mode filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112652466A (en) * | 2021-01-22 | 2021-04-13 | 广东众西力实业有限公司 | Ferrite transformer |
| CN113628833A (en) * | 2021-07-28 | 2021-11-09 | 宁国市裕华电器有限公司 | Common mode inductance, single-phase robot filter |
-
2020
- 2020-03-31 CN CN202020449903.9U patent/CN211578497U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112652466A (en) * | 2021-01-22 | 2021-04-13 | 广东众西力实业有限公司 | Ferrite transformer |
| CN112652466B (en) * | 2021-01-22 | 2024-05-17 | 广东众西力实业有限公司 | Ferrite transformer |
| CN113628833A (en) * | 2021-07-28 | 2021-11-09 | 宁国市裕华电器有限公司 | Common mode inductance, single-phase robot filter |
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