CN208570282U - A kind of switching mode power supply transformer and its magnetic core - Google Patents

A kind of switching mode power supply transformer and its magnetic core Download PDF

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Publication number
CN208570282U
CN208570282U CN201820178235.3U CN201820178235U CN208570282U CN 208570282 U CN208570282 U CN 208570282U CN 201820178235 U CN201820178235 U CN 201820178235U CN 208570282 U CN208570282 U CN 208570282U
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China
Prior art keywords
center pillar
outline border
magnetic core
winding
power supply
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CN201820178235.3U
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Chinese (zh)
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黄小东
洪瑜鹏
黄鸿杰
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Shenzhen Sunlord Electronics Co Ltd
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Shenzhen Sunlord Electronics Co Ltd
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Abstract

It includes center pillar and integrally formed outline border that the utility model, which discloses a kind of switching mode power supply transformer and its magnetic core, the magnetic core,;The center pillar is segmentation stacked structure, forms layer-stepping air gap at segmentation;The center pillar is located in the frame of the outline border, and both ends are abutted with two opposite faces of the outline border respectively, layer-stepping air gap is formed at abutting, wherein, it is filled with magnetic glue layer at the abutting of the top of the center pillar and the outline border, forms distributed air gap between the magnetic powder particle inside the magnetism glue layer.The switching mode power supply transformer includes the magnetic core, pedestal and line pack arrangement;Wherein, the magnetic core is fixed on the pedestal by outline border described in its, and the line pack arrangement includes winding bobbin and the winding that is wound on the winding bobbin;The line pack arrangement is sheathed on outside the center pillar by the winding bobbin, and is located in the frame of the outline border;The lead-out wire of the winding is drawn by the preformed hole on the pedestal.

Description

A kind of switching mode power supply transformer and its magnetic core
Technical field
The utility model relates to switching mode power supply transformer field, especially a kind of switching mode power supply transformer that can reduce leakage field And its magnetic core.
Background technique
Common automobile charging pile uses single-phase perhaps three-phase input to export generally for DC voltage or constant current, Charging pile efficiency is the most important Xiang Zhibiao of automobile charging pile, is directly related to the quality of charging pile performance.Design a height Effect, energy saving, high-energy density charge power supply become the maximum challenge of charging pile industry;It is promoted in charging equipment of electric automobile Under overall situation, low magnetism leakage, high-power high-frequency transformer are studied, is had very important significance.Charging pile transformer magnetic at present Cored structure is mainly the symmetrical assembled magnetic core such as PQ type, EE type, and this type magnetic core air gap concentrates on assembled face, and leakage field is big, electromagnetism spoke Additional copper loss strong and with higher is penetrated, efficiency is lower.
Magnetic flux in transformer can be divided into main flux and leakage magnetic flux from its passage path.Main flux is constrained on iron core In, it interlinks with primary and secondary winding, is the basic carrier of transformer transmitting energy;Leakage field general rule is risen by iron core outer portion space Less than transformer action, and cause added losses, eddy-current loss and form electromagnetic pollution source, reduces charging pile energy transmission efficiency. With the fast development of electric automobile charging pile quantity, energy loss caused by stray transformer flux, electromagnetic interference are not allowed more to neglect Depending on.Therefore, more and more important to the analysis and core structure optimization design of inside transformer magnetic flux leakage.
Utility model content
In order to overcome the deficiencies of the prior art, the utility model proposes a kind of switching mode power supply transformer and its magnetic cores, by excellent Change design core structure to reduce leakage field, and keep Distribution of Magnetic Field more uniform, effectively reduces electromagnetic radiation and high frequency adds copper Damage.
One of technical solution that the utility model proposes in order to overcome the deficiencies of the prior art is as follows:
A kind of magnetic core of switching mode power supply transformer, including center pillar and integrally formed outline border;The center pillar is segmentation stack Structure forms layer-stepping air gap at segmentation;The center pillar is located in the frame of the outline border, and both ends respectively with the outline border two Opposite face abuts, wherein filled with magnetic glue layer, the magnetism glue at the abutting of the top of the center pillar and the outline border Distributed air gap is formed between magnetic powder particle inside layer.
The utility model provides the magnetic core of above-mentioned switching mode power supply transformer, outline border be it is integrally formed, overcome outline border and adopt Leakage field problem present in mode with sectionally smooth join, reduces electromagnetic radiation and high frequency additional copper loss;Simultaneously as at outline border No longer there is air gap, therefore center pillar uses segmentation structure, forms layer-stepping air gap at segmentation, while between center pillar and outline border Magnetic glue layer is capable of providing distributed air gap, and distributed and layer-stepping air gap provides the channel of Homogeneouslly-radiating jointly for magnetic core, Guarantee good heat dissipation effect;On the other hand, the magnetic glue layer also has both the function of adjustment core inductance size.
Preferably, it is bonded at the segmentation of the center pillar using glue.
Preferably, by three center pillar blocks, successively stack forms the center pillar.
Preferably, the layer-stepping air gap is also formed at the abutting of the bottom of the center pillar and the outline border.
Preferably, the bottom of the center pillar is adhesively fixed at the abutting of the outline border using glue;Alternatively, the outline border It is equipped with a groove at the upper abutting with the bottom of the center pillar, the bottom of the center pillar is connected in the groove.
The utility model separately additionally provides a kind of switching mode power supply transformer, including magnetic core above-mentioned, pedestal and line inclusion Structure;Wherein, the magnetic core is fixed on the pedestal by outline border described in its, the line pack arrangement include winding bobbin and around Make the winding on the winding bobbin;The line pack arrangement is sheathed on outside the center pillar by the winding bobbin, and is located at institute It states in the frame of outline border;The lead-out wire of the winding is drawn by the preformed hole on the pedestal.
The switching mode power supply transformer of aforementioned magnetic core is used, electromagnetic radiation is small, high frequency additional copper loss is low, transformer is integrally imitated Rate is high.
Preferably, it is fixed between the lead-out wire of the winding and the preformed hole by glue.
Preferably, the winding being wound on the winding bobbin is coated with insulating tape.
Preferably, the surface of the winding bobbin is coated with insulation rubber band, i.e., the described insulation rubber band is located at the coiling bone Between frame and the winding.
Preferably, it is adhesively fixed between the outline border of the magnetic core and the pedestal using glue.
Detailed description of the invention
Fig. 1 is a kind of illustrative magnetic core schematic diagram provided by specific embodiment of the present invention;
Fig. 2 is a kind of switching mode power supply transformer schematic diagram for having used magnetic core shown in Fig. 1;
Fig. 3 is the line pack arrangement schematic diagram of switching mode power supply transformer shown in Fig. 2;
Fig. 4 is the Distribution of Magnetic Field analogous diagram that a kind of traditional EE type symmetrically splices magnetic core;
Fig. 5 is the Distribution of Magnetic Field analogous diagram of the utility model magnetic core as shown in Figure 1.
Specific embodiment
Below against attached drawing and in conjunction with preferred embodiment, the utility model is described in further detail.
Specific embodiment of the present utility model provides a kind of magnetic core for switching mode power supply transformer, with reference to Fig. 1, institute Stating magnetic core includes center pillar 10 and integrally formed outline border 20;The center pillar 10 is segmentation stacked structure, forms layer-stepping at segmentation Air gap;The center pillar 10 is located in the frame of the outline border 20, and both ends are abutted with two opposite faces of the outline border respectively, at abutting Form layer-stepping air gap, wherein filled with magnetic glue layer 30, institute at the abutting of the top of the center pillar 10 and the outline border 20 It states and forms distributed air gap between the magnetic powder particle inside magnetic glue layer 30.
In a kind of specific embodiment, having the center pillar 10 of segmentation stacked structure is by multiple (at least two) center pillar blocks Successively stack forms, and the stitching portion between center pillar block forms air gap.For example, center pillar 10 shown in Fig. 1, is by three center pillars 13, it 12,11 stacks gradually and is formed, the stitching portion between the adjacent center pillar block of every two can form air gap, thus in center pillar Upper formation layer-stepping air gap, it is possible to provide multi-segment layered heat dissipating.On the other hand, 50 at the abutting of the bottom of center pillar 10 and outline border 20 Also form air gap.Wherein, the mutual stitching portion of center pillar block is adhesively fixed using glue, for example, center pillar block 11 and 12 Stitching portion is bonded using glue 41, and the stitching portion of center pillar block 12 and 13 is Nian Jie using glue 42.
In one embodiment, that glue can be directly used at the bottom of the center pillar 10 and the abutting of outline border 20 is Nian Jie It is fixed.Less deep groove can also be opened up in the corresponding position of outline border 20, and the bottom of center pillar 10 is allowed to be connected to the groove In.
Another specific embodiment of the utility model provides a kind of switching mode power supply transformer, with reference to Fig. 2, the switch Power transformer includes magnetic core exemplified by such as Fig. 1 of aforementioned offer, a pedestal 1 and line pack arrangement as shown in Figure 3.Its In, the magnetic core is fixed on the pedestal 1 by its described outline border 20, the line pack arrangement include winding bobbin 2 and around Make the winding 3 on the winding bobbin;The line pack arrangement is sheathed on outside the center pillar 10 by the winding bobbin 2, and position In in the frame of the outline border 20;The lead-out wire of the winding 3 is drawn by the preformed hole on the pedestal 1.
In a preferred embodiment, center pillar 10 is cylindric, winding bobbin 2 be it is circular, primary and secondary winding i.e. around For system on the ring of winding bobbin, winding 3 shown in the drawings is that primary or secondary windings, another winding are in not visible in figure Position.
Y line shown in Fig. 1 to Fig. 3 is only used for characterizing magnetic core as shown in Figure 1 and line pack arrangement shown in Fig. 3 is assembling Assembly position relation when switching mode power supply transformer shown in Fig. 2 is formed, when assembly: in advance splicing between the center pillar block of center pillar Place carries out dispensing drying forming, then the pre- cementing in corresponding position abutted in advance on outline border with middle column bottom;Then by line packet The skeleton of structure covers outside center pillar;Center pillar and line pack arrangement are integrally assembled in the frame of outline border 20 again, allow middle column bottom and outer Bonding is abutted on frame in place of pre- cementing, while the lead-out wire 31 of winding is pierced by by corresponding preformed hole, blend compounds hydropexis Lead-out wire and preformed hole;And magnetic glue is injected with the instrument such as syringe is used at the abutting of outline border at the top of center pillar, it can be with marginal not Enter side and adjusts inductance.To complete the assembly of entire switching mode power supply transformer.
In a preferred embodiment, as shown in Figures 2 and 3, the winding 3 being wrapped on winding bobbin 2 is coated with adhesive tape 32, there is insulating effect;On the other hand, the surface of the winding bobbin 2 is coated with adhesive tape 33, be located at the winding bobbin 2 with Between the winding 3, the buffer action inside and outside skeleton between winding is played.It can also be used between the outline border 20 and pedestal 1 of magnetic core Glue is adhesively fixed.
Symmetrically splice magnetic core by switching mode power supply transformer magnetic core to the aforementioned offer of the utility model and traditional EE type Electric Field Simulation is carried out respectively, and correspondence obtains Fig. 5 and field distribution schematic diagram shown in Fig. 4.It is compared from field distribution simulation result Find out, traditional EE type symmetrically splices magnetic core to be concentrated in the stitching portion magnetic line of force of outline border, generates many leakage fields;And the utility model The Distribution of Magnetic Field of the magnetic core of offer is more uniform, and outline border magnetic leakage free phenomenon, and the leakage field rate of entire magnetic core is only 2~3%.From And switching mode power supply transformer provided by the utility model, magnetic core leakage field are small, and air gap concentrates on center pillar, convenient for transformer into Row shielding processing avoids interfering with each other between each component of charging pile, reduces the pollution to power grid;In addition, air gap is at center pillar It is uniformly distributed, in addition the distributed air gap among magnetic glue layer, can allow the heat of transformer to be able to distribute from many places, guarantees Good heat dissipation effect.
It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined Assert that the specific implementation of the utility model is only limited to these instructions.For those skilled in the art of the present invention For, without departing from the concept of the premise utility, several equivalent substitute or obvious modifications, and performance can also be made Or purposes is identical, all shall be regarded as belonging to the protection scope of the utility model.

Claims (10)

1. a kind of magnetic core of switching mode power supply transformer, it is characterised in that: including center pillar (10) and integrally formed outline border (20);Institute Center pillar (10) are stated as segmentation stacked structure, form layer-stepping air gap at segmentation;The center pillar (10) is located at the outline border (20) In frame, and both ends are abutted with two opposite faces of the outline border respectively, and layer-stepping air gap is formed at abutting, wherein the center pillar Magnetic glue layer (30), shape between the magnetic powder particle inside the magnetism glue layer are filled at the abutting of top and the outline border At distributed air gap.
2. magnetic core as described in claim 1, it is characterised in that: be bonded at the segmentation of the center pillar (10) using glue.
3. magnetic core as claimed in claim 1 or 2, it is characterised in that: the center pillar (10) is by three center pillar blocks (11,12,13) Successively stack forms.
4. magnetic core as described in claim 1, it is characterised in that: the bottom of the center pillar (10) and the abutting of the outline border (20) Place (50) also forms the layer-stepping air gap.
5. magnetic core as claimed in claim 4, it is characterised in that: the bottom of the center pillar (10) and the abutting of the outline border (20) Place (50) is adhesively fixed using glue;Alternatively, being set on the outline border (20) with (50) at the abutting of the bottom of the center pillar (10) There is a groove, the bottom of the center pillar (10) is connected in the groove.
6. a kind of switching mode power supply transformer, it is characterised in that: including magnetic core such as described in any one of claim 1 to 5, pedestal (1) and line pack arrangement;Wherein, the magnetic core is fixed on the pedestal (1) by its described outline border (20), the line inclusion Structure includes winding bobbin (2) and the winding (3) being wound on the winding bobbin;The line pack arrangement passes through the winding bobbin (2) it is sheathed on the center pillar (10) outside, and is located in the frame of the outline border (20);The lead-out wire of the winding (3) passes through described Preformed hole on pedestal (1) is drawn.
7. switching mode power supply transformer as claimed in claim 6, it is characterised in that: the lead-out wire (31) of the winding (3) and institute It states and is fixed between preformed hole by glue.
8. switching mode power supply transformer as claimed in claim 6, it is characterised in that: the institute being wound on the winding bobbin (2) It states winding (3) and is coated with insulating tape (32).
9. switching mode power supply transformer as claimed in claim 6, it is characterised in that: the surface of the winding bobbin (2) is coated with Insulation rubber band (33), i.e., the described insulation rubber band (33) is between the winding bobbin (2) and the winding (3).
10. switching mode power supply transformer as claimed in claim 6, it is characterised in that: the outline border (20) of the magnetic core and the bottom It is adhesively fixed between seat (1) using glue.
CN201820178235.3U 2018-02-01 2018-02-01 A kind of switching mode power supply transformer and its magnetic core Active CN208570282U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111899964A (en) * 2020-08-03 2020-11-06 上海交通大学 Multi-winding high-frequency transformer with solid insulation structure
CN112164565A (en) * 2020-08-27 2021-01-01 北京金晟达生物电子科技有限公司 Inductor
CN113436850A (en) * 2021-06-30 2021-09-24 天津大学 High-frequency segmented air gap planar transformer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111899964A (en) * 2020-08-03 2020-11-06 上海交通大学 Multi-winding high-frequency transformer with solid insulation structure
CN111899964B (en) * 2020-08-03 2024-04-26 上海交通大学 Multi-winding high-frequency transformer with solid insulation structure
CN112164565A (en) * 2020-08-27 2021-01-01 北京金晟达生物电子科技有限公司 Inductor
CN113436850A (en) * 2021-06-30 2021-09-24 天津大学 High-frequency segmented air gap planar transformer

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