CN203850116U - Transformer - Google Patents
Transformer Download PDFInfo
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- CN203850116U CN203850116U CN201420159257.7U CN201420159257U CN203850116U CN 203850116 U CN203850116 U CN 203850116U CN 201420159257 U CN201420159257 U CN 201420159257U CN 203850116 U CN203850116 U CN 203850116U
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- copper sheet
- transformer
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- winding
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Abstract
The utility model provides a transformer. The transformer comprises a magnetic core and at least two windings the magnetic core is sleeved with. Each winding comprises at least one copper sheet, the copper sheet is arranged around the periphery of the cross section of the magnetic core and comprises a first end face and a second end face located on the back side of the first end face, wherein the copper sheet comprises a first end part and a second end part located on the same side with the first end part, the first end part is provided with a first electric connection part on the first end face, the second end part is provided with a second electric connection part on the second end face, and the surface of the copper sheet except the first electric connection part and the second electric connection part is covered with an insulating layer. The transformer is good in electromagnetic coupling performance and simple in structure, and large-scale and modularized production of the planar transformer is facilitated.
Description
Technical field
The utility model relates to field transformer, relates in particular to a kind of flat surface transformer.
Background technology
Transformer is exactly that one utilizes undesirable mutual electromagnetic inductance to answer, and realizes voltage of transformation, the device of electric current and impedance.Transformer is made up of magnetic core and winding, and winding is divided into armature winding and secondary winding.
And flat surface transformer is compared maximum difference from traditional transformer and is the different of magnetic core and winding.Flat surface transformer adopts undersized E type, RM type or ring-like FERRITE CORE, normally made by high-frequency power ferrite material, under high frequency, there is lower core loss, winding adopts multilayer board repeatedly around forming, and on printed circuit board (PCB), be covered with Copper Foil, by forming the magnetic loop of transformer on the high-frequency core in plane at this Copper Foil.And due to the good magnetic screen of magnetic core, can suppress radio frequency interference.
But, on PCB circuit board, Copper Foil is processed to comparatively difficulty, and the operating current that on PCB circuit board, Copper Foil can bear is less, cannot be applied in high-power transformer.Meanwhile, in the time that multilayer PCB circuit board is arranged in magnetic core, because PCB circuit board thickness is thicker, make on adjacent PCB circuit board between Copper Foil distance larger, cause easily producing leakage inductance, and power density is little.
Summary of the invention
The purpose of this utility model is to provide a kind of have good electromagnetic coupled performance and flat surface transformer simple in structure.
In order to realize the purpose of this utility model, the utility model provides a kind of transformer, this transformer comprises magnetic core and is enclosed within least two windings on magnetic core, each winding comprises at least one copper sheet, copper sheet is around the periphery setting of magnetic core cross section, copper sheet comprises the first end face and is positioned at the second end face of the first end face dorsal part, wherein, copper sheet comprises first end and is positioned at the second end of the same side with first end, first end is provided with the first electrical connection section on the first end face, the second end is provided with the second electrical connection section on the second end face, the surface of copper sheet except the first electrical connection section and the second electrical connection section is covered with insulating barrier.
From such scheme, winding is made up of the copper sheet of flat, and the surface except electrical connection section is covered with the insulating barrier for insulating at copper sheet, in the time that the copper sheet of armature winding and secondary winding is installed in magnetic core, because copper sheet can be made into different-thickness or geomery according to different conductive currents or different skin depth demands, be conducive to reduce the impact of skin effect, utilize whole copper sheet to carry out the conducting of electric current, make copper sheet can adapt to the electric current of different sizes, thereby improve the power of this transformer, fit tightly by the copper sheet of armature winding and the copper sheet of secondary winding simultaneously, thereby in reducing leakage inductance, improve the electromagnetic coupled performance of transformer.
Further scheme is, a winding comprises plural copper sheet, and the second electrical connection section electricity of the first electrical connection section of a copper sheet and an adjacent copper sheet of same winding in succession.
Therefore; by being electrically connected with and being beneficial to connection convenient for assembly at the electrical connection section of different end face settings; and use the coiling that just can realize multiturn copper sheet by the identical copper sheet upset of geomery; the copper sheet that makes to produce one or more specifications just can complete the coiling of winding; standardized being designed with of device is beneficial to scale and modular production; enhance productivity, reduce costs.
Further scheme is, the mode of electrical connection is welding.
Therefore, be welded to connect and be conducive to reduce conductor resistance, improve electric conductivity.
Further scheme is, the first electrical connection section of a copper sheet of a winding be arranged on a copper sheet of an adjacent winding the first electrical connection section in side.
Therefore by the insertion technology back to placing armature winding and this transformer of secondary winding, the coupling between increase winding, to reduce leakage inductance, makes electric current be evenly distributed, and reduces transformer loss simultaneously.
Further scheme is, the thickness of a copper sheet is more than or equal to the thickness of an adjacent copper sheet.
Therefore the thickness of copper sheet can be according to the size of current setting of actual conducting, thereby improve the applicability of transformer, the skin depth when thickness of copper sheet also can be according to the required maximum switching frequency of reality is chosen, and is conducive to reduce the impact of skin effect.
Further scheme is, multiple copper sheets are integrated by pressing postadhesion.
Therefore, the insulating barrier covering due to copper sheet outer surface mostly is the less materials of hardness such as resin, plastics, silicon rubber or PVC, this insulating barrier is integrated bonding by after pressing, thereby improve the electromagnetic coupled performance of transformer, reduce the generation of leakage inductance, be also conducive to improve the power density of this transformer simultaneously.
Further scheme is, transformer also comprises the first radiator, and the first radiator comprises the housing with magnetic core adjacency.
Further scheme is, the first radiator also comprises multiple radiating fins that are arranged on housing, and multiple radiating fins are parallel distribution or radially distribute.
Therefore, because the used heat in transformer is mainly produced by magnetic core, so have air-cooled radiator in magnetic core adjacency, utilize this air-cooled radiator that used heat is taken away, and utilize the radiating fin that radially distributes or the radiating fin of parallel shape to dispel the heat, be conducive to improve area of dissipation, be conducive to the Homogeneouslly-radiating of transformer.
Further scheme is, transformer also comprises the second radiator, and the second radiator comprises housing, and housing surrounds the container cavity that accommodates cooling agent, and housing offers water inlet and delivery port, the outer wall of housing and magnetic core adjacency.
Further scheme is, housing is clipped in the both sides of magnetic core, and water inlet and delivery port are separately positioned on the both sides of magnetic core.
Therefore, because the used heat in transformer is mainly produced by magnetic core, so have water-filled radiator in magnetic core adjacency, utilize the cooling agent holding in this water-filled radiator that used heat is taken away, and be clipped on magnetic core both sides by the housing outer wall of water-filled radiator, cooling agent is carried out circulation cooling by recycling water inlet and delivery port, is conducive to improve heat dispersion.
Brief description of the drawings
Fig. 1 is the exploded view of the utility model transformer the first embodiment.
Fig. 2 is the structure chart of the first copper sheet in the utility model transformer the first embodiment.
Fig. 3 is the structure chart of the second copper sheet in the utility model transformer the first embodiment.
Fig. 4 is the structure chart of the 3rd copper sheet in the utility model transformer the first embodiment.
Fig. 5 is the cutaway view of the electrical connection section of multiple copper sheets in the utility model transformer the first embodiment while interconnecting.
Fig. 6 is the structure chart of the 4th copper sheet in the utility model transformer the second embodiment.
Fig. 7 is the exploded view of the utility model transformer the second embodiment.
Fig. 8 is the left view of the utility model transformer the second embodiment.
Fig. 9 is the vertical view of the utility model transformer the second embodiment.
Figure 10 is the structure chart of the utility model transformer the 3rd embodiment.
Figure 11 is the structure chart of the utility model transformer the 4th embodiment.
Figure 12 is the structure chart of winding in the utility model transformer the 5th embodiment.
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment
Transformer the first embodiment:
With reference to Fig. 1, Fig. 1 is the exploded view of transformer 1, and transformer 1 comprises magnetic core 11, magnetic core 12, winding 2 and winding 3.Magnetic core 11 and magnetic core 12 are FERRITE CORE, magnetic core 11 offers groove 111 and groove 112, and be formed with boss 113 between groove 111 and groove 112, magnetic core 12 has the structure with magnetic core 11 same sizes, magnetic core 12 offers groove 121 and groove 122, and is formed with boss 123 between groove 121 and groove 122.Winding 2 comprises copper sheet 21,22,23,24 and copper sheet 25, winding 3 comprises copper sheet 31,32,33,34 and copper sheet 35, wherein, copper sheet 21, copper sheet 25, copper sheet 31 and copper sheet 35 are the copper sheet with same size structure, copper sheet 22, copper sheet 24, copper sheet 32 and copper sheet 34 are the copper sheet with same size structure, copper sheet 23 and copper sheet 33 are for having the copper sheet of same size structure, and above-mentioned copper sheet has adopted different mounting meanss in the time being installed in transformer 1.
With reference to Fig. 2 and Fig. 5, because copper sheet 21, copper sheet 25, copper sheet 31 and copper sheet 35 are the copper sheet with same size structure, so describe as an example of copper sheet 21 example.Copper sheet 21 comprises copper core 211, copper core 211 extends and arranges along the cross-sectional circumference of boss 113 or boss 123, copper sheet 21 comprises the first end face and is positioned at the second end face of the first end face dorsal part, copper sheet 21 also comprises first end and the second end, first end and the second end are positioned at the same side, the first end of copper sheet 21 is provided with electrical connection section 212 on the first end face, the second end of copper sheet 21 is provided with electrical connection section 213 on the second end face, and the surface except electrical connection section 212 and electrical connection section 213 is covered with insulating barrier 214 at copper sheet 21.
With reference to Fig. 3 and Fig. 5, because copper sheet 22, copper sheet 24, copper sheet 32 and copper sheet 34 are the copper sheet with same size structure, so describe as an example of copper sheet 22 example.Copper sheet 22 comprises copper core 221, copper core 221 extends and arranges along the cross-sectional circumference of boss 113 or boss 123, copper sheet 22 comprises the first end face and is positioned at the second end face of the first end face dorsal part, copper sheet 22 also comprises first end and the second end, first end and the second end are positioned at the same side, the first end of copper sheet 22 is provided with electrical connection section 222 on the first end face, the second end of copper sheet 22 is provided with electrical connection section 223 on the second end face, and the surface except electrical connection section 222 and electrical connection section 223 is covered with insulating barrier 224 at copper sheet 22.
With reference to Fig. 4 and Fig. 5, because copper sheet 23 and copper sheet 33 are for to have the copper sheet of same size structure, so describe as an example of copper sheet 23 example.Copper sheet 23 comprises copper core 231, copper core 231 extends and arranges along the cross-sectional circumference of boss 113 or boss 123, copper sheet 23 comprises the first end face and is positioned at the second end face of the first end face dorsal part, copper sheet 23 also comprises first end and the second end, first end and the second end are positioned at the same side, the first end of copper sheet 23 is provided with electrical connection section 232 on the first end face, the second end of copper sheet 23 is provided with electrical connection section 233 on the second end face, and the surface except electrical connection section 232 and electrical connection section 233 is covered with insulating barrier 224 at copper sheet 23.
With reference to Fig. 5, Fig. 5 is copper sheet 21, the schematic diagram when electrical connection section of copper sheet 22 and copper sheet 23 interconnects, when copper sheet 21, copper sheet 22 and copper sheet 23 are sleeved in magnetic core 11, copper sheet 21 is arranged on the top of copper sheet 22, copper sheet 22 is arranged on the top of copper sheet 23, and electrical connection section 213 is positioned at the top of electrical connection section 222, electrical connection section 223 is positioned at the top of electrical connection section 232, copper sheet is adopted and the mode such as welds after riveting again and just can complete being electrically connected between electrical connection section 213 and electrical connection section 222, and complete being electrically connected between electrical connection section 223 and electrical connection section 232, thereby complete copper sheet 21, copper sheet 22 and copper sheet 23 electrical connection each other.Foreign current can flow into from electrical connection section 212, through the conduction of copper core 211, then flow out to electrical connection section 222 from electrical connection section 213, again by the conduction of copper core 221, flow out to electrical connection section 232 from electrical connection section 223 again, again by the conduction of copper core 231, finally output to from electrical connection section 233 copper sheet 24 that upset arranges, use again same catenation principle by the circuit copper sheet 25 that leads, visible, by copper sheet with respect to position on electrical connection section is set just can makes winding 2 form loop in magnetic core periphery, and produce magnetic flux.
In like manner, the connected mode that copper sheet 31,32,33,34 in winding 3 can be installed winding 2 with copper sheet 35 is connected, thereby form armature winding and secondary winding between winding 2 and winding 3, and will press by the copper sheet of winding 2 and winding 3, because insulating barrier mostly is the material of resin, plastics, silicon rubber or PVC etc., press the embedding of rear recycling heat conductive silica gel winding is binded and is integrated, be conducive to improve insulation property and improve heat dispersion by heat conductive silica gel embedding.
When transformer 1 is worked, winding 2 is electrically connected with AC power, winding 3 is electrically connected with load, wherein, the electrical connection section 212 of copper sheet 21 is connected with positive pole and the negative pole of AC power respectively with the second electrical connection section of copper sheet 25, the electrical connection section 312 of copper sheet 31 and the second electrical connection section of copper sheet 35 respectively in load positive pole be connected with negative pole.In the time that alternating current passes through winding 2, electric current is inputted from electrical connection section 212, after transmitting, copper core 211 outputs to the electrical connection section 222 of the below that is positioned at copper sheet 21 from electrical connection section 213, then passing through after the transmission of copper core 221, output to from electrical connection section 223 copper sheet 23 that is positioned at copper sheet 22 belows again, by that analogy, thereby make the winding 2 that is sleeved on magnetic core 11 and magnetic core 12 produce annular alternating current, then produce exchange flux.And the copper sheet connection of winding 3 and operation principle and winding 2 is identical, makes the secondary winding 3 that is set with magnetic core 11 and magnetic core 12 induce voltage or electric current, thereby realize the conversion of voltage, electric current and impedance.
Transformer the second embodiment:
With reference to Fig. 6, on the basis of transformer the first embodiment, transformer 5 can also increase by two copper sheets 4, copper sheet 4 comprises copper core 41, copper core 41 extends and arranges along the cross-sectional circumference of boss 113 or boss 123, copper sheet 4 comprises the first end face and is positioned at the second end face of the first end face dorsal part, copper sheet 4 also comprises first end and the second end, first end and the second end are positioned at the same side, the first end of copper sheet 22 is provided with electrical connection section 42 on the first end face, the second end of copper sheet 4 is provided with electrical connection section 43 on the second end face, and the surface except electrical connection section 42 and electrical connection section 223 is covered with insulating barrier at copper sheet 4.
With reference to Fig. 7, transformer 5 can also increase copper sheet 26,27,28,29,30,36,37,38,39 and copper sheet 40, copper sheet 4 is for being connected between copper sheet 25 and copper sheet 26, because copper sheet 25 and copper sheet 26 have same structure and mutually arrange turningly, so the electric current that copper sheet 25 is exported is transmitted in copper sheet 26 by copper sheet 4, then copper sheet 26 connects other copper sheets according to above-mentioned principle, makes electric current enter next circulation.
Copper sheet 4 also can be used for being connected between copper sheet 35 and copper sheet 36, because copper sheet 35 and copper sheet 36 have same structure and mutually arrange turningly, so the electric current that copper sheet 35 is exported is transmitted in copper sheet 26 by copper sheet 4, then copper sheet 26 connects other copper sheets according to above-mentioned principle, makes electric current enter next circulation.
With reference to Fig. 8 and Fig. 9, Fig. 8 is that transformer 5 omits the left view after copper sheet 4, and Fig. 9 is the vertical view of transformer 5.Copper sheet 21 to 30 and copper sheet 4 form armature winding 51, copper sheet 31 to 40 and copper sheet 4 form secondary winding 52, armature winding 51 is clipped in the both sides of secondary winding 52, by alternately placing the insertion technology of armature winding and this transformer of secondary winding, coupling between increase winding is to reduce leakage inductance, make electric current be evenly distributed simultaneously, reduce transformer loss.Certainly, the copper sheet of armature winding and secondary winding can also be stacked alternately back to ground, utilize this insertion technology also effectively to increase the coupling between winding.Multiple copper sheets of transformer are become one by after pressing simultaneously, the distance between copper sheet is reduced, be conducive to improve electromagnetic coupled efficiency, also improve power density.Preferably, the copper sheet thickness of armature winding 51 is more than or equal to the copper sheet thickness of secondary winding 52, or the copper sheet thickness of armature winding 51 is less than or equal to the copper sheet thickness of secondary winding 52.Preferably, except employing copper sheet 4 is electrically connected, can adopt wire to be electrically connected.
Transformer the 3rd embodiment:
With reference to Figure 10, on the basis of transformer the second embodiment, transformer 5 (having omitted copper sheet in figure) can also increase air-cooled radiator 6, air-cooled radiator 6 comprises the housing with the magnetic core adjacency of transformer 5, preferably, the housing of air-cooled radiator 6 can also be connected with transformer 5 by silica gel or heat conductive pad, the magnetic core that the outer wall of air-cooled radiator 6 is enclosed in transformer 5 around, to increase heat-conducting area and to improve heat transfer efficiency.Further scheme is, air-cooled radiator 6 is made up of multiple radiating fins 61, and multiple described radiating fins are parallel distribution, preferably, air-cooled radiator 6 can also be provided with radiator fan in the middle, and multiple described radiating fins 61 radially distribute centered by radiator fan.
Transformer the 4th embodiment:
With reference to Figure 10, on the basis of transformer the second embodiment, multiple transformers 5 (having omitted copper sheet in figure) can also be arranged in water-filled radiator 7 and dispel the heat, water-filled radiator 7 comprises housing, housing surrounds the container cavity 71 and the container cavity 72 that accommodate cooling agent, the outer wall of container cavity 71 and container cavity 72 is clipped in the magnetic core both sides of transformer 5, below container cavity 71 and container cavity 72, offer respectively water inlet 73 and delivery port 74, water-filled radiator 7 also comprises the tube connector 75 for connecting container cavity 71 and container cavity 72.
Transformer the 5th embodiment:
With reference to Figure 12, the winding of the utility model transformer is except the winding as described in the first embodiment or the second embodiment, winding that can also be as shown in figure 11, copper sheet 81 comprises two electrical connection sections 811 and 812, copper sheet 82 comprises two electrical connection sections 821 and 822, wherein, connecting portion 812 and 822 is respectively and the bending 90 degree settings of copper sheet body, and in the middle of winding, be provided with two magnetic cores, electrical connection section 812 and electrical connection section 822 are electrically connected and are arranged between two magnetic cores, electrical connection section 812 and electrical connection section 822 are extended outside magnetic core, so that it is welded to connect.
From such scheme, winding is made up of the copper sheet of flat, and the surface except electrical connection section is covered with the insulating barrier for insulating at copper sheet, in the time that the copper sheet of armature winding and secondary winding is installed in magnetic core, because copper sheet can be made into different-thickness or geomery according to different conductive currents or different skin depth demands, be conducive to reduce the impact of skin effect, utilize whole copper sheet to carry out the conducting of electric current, make copper sheet can adapt to the electric current of different sizes, thereby improve the power of this transformer, fit tightly by the copper sheet of armature winding and the copper sheet of secondary winding simultaneously, thereby in reducing leakage inductance, improve the electromagnetic coupled performance of transformer.Moreover, by producing the copper sheet of copper sheet 21,22,23 and copper sheet 4 these four kinds of specifications, by different assembly methods; just can assemble multicircuit winding; standardized being designed with of device is beneficial to this flat surface transformer scale and modular production, enhances productivity, and reduces costs.
Finally it is emphasized that; the utility model is not limited to above-mentioned execution mode; copper sheet 21,22,23 and copper sheet 4 be preferably embodiment of one of the utility model just; compound mode between copper sheet can change the setting position of electrical connection section according to the actual requirements, and these all should be included in the protection range of the utility model claim.
Claims (10)
1. transformer, comprises magnetic core and is enclosed within least two windings on described magnetic core;
Described in each, winding comprises at least one copper sheet, and described copper sheet is around the periphery setting of described magnetic core cross section, and described copper sheet comprises the first end face and is positioned at the second end face of described the first end face dorsal part;
It is characterized in that:
Described copper sheet comprises first end and is positioned at the second end of the same side with described first end, described first end is provided with the first electrical connection section on described the first end face, described the second end is provided with the second electrical connection section on described the second end face, and the surface of described copper sheet except described the first electrical connection section and described the second electrical connection section is covered with insulating barrier.
2. transformer according to claim 1, is characterized in that:
A described winding comprises plural described copper sheet, and the described second electrical connection section electricity of described first electrical connection section of a described copper sheet and an adjacent described copper sheet of same winding in succession.
3. transformer according to claim 2, is characterized in that:
The mode of described electrical connection is welding.
4. transformer according to claim 2, is characterized in that:
Described first electrical connection section of a described copper sheet of a described winding be arranged on a described copper sheet of an adjacent described winding described the first electrical connection section in side.
5. transformer according to claim 4, is characterized in that:
The thickness of a described copper sheet of a described winding is more than or equal to the thickness of a described copper sheet of an adjacent described winding.
6. transformer according to claim 4, is characterized in that:
Multiple described copper sheets are integrated by pressing postadhesion.
7. according to the transformer described in claim 1 to 6 any one, it is characterized in that:
Described transformer also comprises the first radiator, and described the first radiator comprises the housing with described magnetic core adjacency.
8. transformer according to claim 7, is characterized in that:
Described the first radiator also comprises multiple radiating fins that are arranged on described housing, and multiple described radiating fins are parallel distribution or radially distribute.
9. according to the transformer described in claim 1 to 6 any one, it is characterized in that:
Described transformer also comprises the second radiator, and described the second radiator comprises housing, and described housing surrounds the container cavity that accommodates cooling agent, and described housing offers water inlet and delivery port, the outer wall of described housing and described magnetic core adjacency.
10. transformer according to claim 9, is characterized in that:
Described housing is clipped in the both sides of described magnetic core, and described water inlet and described delivery port are separately positioned on the both sides of described magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420159257.7U CN203850116U (en) | 2014-04-02 | 2014-04-02 | Transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420159257.7U CN203850116U (en) | 2014-04-02 | 2014-04-02 | Transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203850116U true CN203850116U (en) | 2014-09-24 |
Family
ID=51563101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420159257.7U Expired - Fee Related CN203850116U (en) | 2014-04-02 | 2014-04-02 | Transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203850116U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2535822A (en) * | 2015-02-26 | 2016-08-31 | Lear Corp | Planar transformer |
| CN106057443A (en) * | 2015-04-08 | 2016-10-26 | 李尔公司 | Cooling method for planar electrical power transformer |
| US10147531B2 (en) | 2015-02-26 | 2018-12-04 | Lear Corporation | Cooling method for planar electrical power transformer |
-
2014
- 2014-04-02 CN CN201420159257.7U patent/CN203850116U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2535822A (en) * | 2015-02-26 | 2016-08-31 | Lear Corp | Planar transformer |
| US20160254087A1 (en) * | 2015-02-26 | 2016-09-01 | Lear Corporation | Planar Transformer |
| CN105931815A (en) * | 2015-02-26 | 2016-09-07 | 李尔公司 | Planar transformer |
| CN105931815B (en) * | 2015-02-26 | 2018-07-10 | 李尔公司 | Flat surface transformer |
| US10062496B2 (en) * | 2015-02-26 | 2018-08-28 | Lear Corporation | Planar transformer |
| US10147531B2 (en) | 2015-02-26 | 2018-12-04 | Lear Corporation | Cooling method for planar electrical power transformer |
| GB2535822B (en) * | 2015-02-26 | 2019-09-25 | Lear Corp | Planar transformer with conductor plates forming windings |
| CN106057443A (en) * | 2015-04-08 | 2016-10-26 | 李尔公司 | Cooling method for planar electrical power transformer |
| CN106057443B (en) * | 2015-04-08 | 2018-09-11 | 李尔公司 | The cooling means of plane power transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20170402 |
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| CF01 | Termination of patent right due to non-payment of annual fee |