CN201327765Y - High-frequency transformer for electric welding device - Google Patents
High-frequency transformer for electric welding device Download PDFInfo
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- CN201327765Y CN201327765Y CNU2008202135696U CN200820213569U CN201327765Y CN 201327765 Y CN201327765 Y CN 201327765Y CN U2008202135696 U CNU2008202135696 U CN U2008202135696U CN 200820213569 U CN200820213569 U CN 200820213569U CN 201327765 Y CN201327765 Y CN 201327765Y
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Abstract
The utility model relates to a high-frequency transformer for an electric welding device, which comprises a magnetic core and a winding skeleton with two leading wire fixed grooves as well as a primary and a secondary windings which are winded on the winding skeleton; the primary winding comprises an inner and an outer primary coils, and the secondary winding is arranged between the inner and the outer primary coils. The primary winding is formed by winding a plurality of lacquered wire harness in four layers, and the inner layer of primary coils is provided with two layers, and the outer layer of the primary coil is provided with two layers, and the same end of each layer of primary coils is respectively electrically connected with each other. The secondary winding comprises two groups of primary coils, and each group of primary coils is formed by winding a plurality of lacquered wire harness in two layers; after being serially connected with each other, two layers of coils of one group of primary coils are led out from the serially-connected point in a tapping way; the two layers of primary coils of another group of primary coils are led from the serially-connected point in a tapping way after being serially connected with each other. The high-frequency transformer has the advantages of high power-to-volume ratio, high work frequency, low magnetic leakage, favorable heat radiation, high efficiency, stable current output, high insulation strength, convenient installation, and the like.
Description
[technical field]
The utility model relates to the equipment that the AC power input is transformed to AC power output, and particularly the core transformers of supersonic frequency relates in particular to the high frequency transformer that is used for electric welding equipment.
[background technology]
Prior art electric welding equipment such as the more and more miniaturization of inverter welding machine, its operating frequency is also more and more higher, thereby also correspondingly requires miniaturization, high frequencyization and power output bigger with high frequency transformer thereon.
High frequency transformer operating frequency on the prior art inverter welding machine is mostly at 20～30kHz, elementary winding and secondary winding adopt Copper Foil or multiply enamelled wire to divide two-layer coiling, owing to be subjected to the restriction of operating frequency and primary and secondary heating in winding problem, its power output is less, as the FERRITE CORE model is the high frequency transformer of EER42, its power output is less than 1 kilowatt, the prior art high frequency transformer adopts mechanical system to fix when mounted in addition, installs inconvenient when a plurality of transformers connected in parallel or series connection are used.
[utility model content]
The technical problems to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part and a kind of high frequency transformer that is used for electric welding equipment is provided, and this high frequency transformer has high power volume ratio, high workload frequency, low magnetism leakage, good advantages such as heat radiation, high efficiency, stable output current, high insulation resistance and convenient installation.
The technical scheme that the utility model solve the technical problem employing is:
A kind of high frequency transformer that is used for electric welding equipment is provided, comprises that magnetic core and top are provided with the winding skeleton of two lead-in wire holddown grooves, and be wound on elementary winding and secondary winding on this winding skeleton; Described elementary winding comprises inside and outside two groups of primary coils, and described secondary winding is between these inside and outside two groups of primary coils.
Above-mentioned elementary winding adopts multiply enamel-cover wire harness to divide four layers of coiling, and wherein the internal layer primary coil is provided with two-layerly, and outer primary coil also is provided with two-layer, and the same inscription end of each layer primary coil is electrically connected respectively.The enamelled wire diameter of described elementary winding is 0.40～0.60 millimeter.
Above-mentioned secondary winding comprises two groups of secondary coils, adopts multiply enamel-cover wire harness to divide two-layer coiling respectively.Wherein draw from the series connection point tap the two-layer coil series connection back of one group of secondary coil.Also draw after the two-layer secondary coil series connection of another group secondary coil from the series connection point tap.The enamelled wire diameter of described secondary winding is all 0.40～0.60 millimeter.
Compare with prior art, its beneficial effect of high frequency transformer that the utility model is used for electric welding equipment is:
1, high power volume ratio and high workload frequency, i.e. the identical high frequency transformer of FERRITE CORE model, the utility model power output is big, and for example the magnetic core model is that the utility model high frequency transformer of EER42 can be exported 2 kw of power under the 110kHz operating frequency;
2, low magnetism leakage, good heat radiation, high efficiency and stable output current, by two groups of primary coils are set, and secondary winding is positioned at the centre of two groups of primary coils, the impedance design optimum Match of two groups of primary coils and each hierarchical level pitch of the laps has reduced transformer leakage inductance, makes each primary and secondary heating in winding even, strengthened radiating effect, reduced temperature rise, also improved operating efficiency, highly stable output current has been arranged;
3, dielectric strength height between secondary winding and the every group of elementary winding, all be provided with insulating material between every hierarchical level coil and between every layer of primary coil, has improved their dielectric strength;
4, easy for installation; on the winding skeleton of described high frequency transformer, many pieces of stitch are set; each direct and corresponding stitch of output lead of two groups of secondary coils is electrically connected; and each stitch more can directly weld in the circuit board; make the single or multiple transformer serial or parallel connections on the wiring board convenient, be convenient to large-scale production.
[description of drawings]
Fig. 1 is the main schematic diagram of looking of partly cuing open of the utility model high frequency transformer of being used for electric welding equipment;
Fig. 2 is the elevational schematic view of Fig. 1;
Fig. 3 is that the master who is wound with elementary winding and secondary winding on the half of winding skeleton of described high frequency transformer looks schematic diagram;
Fig. 4 is the electric principle schematic of described high frequency transformer lead-out wire.
[embodiment]
Below in conjunction with each accompanying drawing the utility model is described in further detail.
Referring to Fig. 1 and Fig. 3, a kind of high frequency transformer that is used for electric welding equipment comprises that magnetic core 60 and top are provided with the winding skeleton 20 of two lead-in wire holddown grooves (not drawing among the figure), and is wound on elementary winding 30 and secondary winding 40 on this winding skeleton 20; Described elementary winding 30 comprises inside and outside two groups of primary coils 31,32, and described secondary winding 40 is between these inside and outside two groups of primary coils 31,32.
Referring to Fig. 1, Fig. 3 and Fig. 4, above-mentioned elementary winding 30 adopts multiply enamel-cover wire harness to divide four layers of N1, N2, N7, N8 coiling, wherein internal layer primary coil 31 is provided with two-layer N1, N2, outer primary coil 32 also is provided with two-layer N7, N8, the same inscription end of each layer primary coil is electrically connected respectively, and the primary coil electrical connection all in parallel that promptly is positioned at N1, N2, N7 and each layer of N8 becomes two bundle conductive paint envelope curves and draws.The enamelled wire diameter of described elementary winding 30 is 0.40～0.60 millimeter.
Referring to Fig. 1, Fig. 3 and Fig. 4, above-mentioned secondary winding 40 comprises two groups of secondary coils 41,42, adopts multiply enamel-cover wire harness to divide two-layer N3, N4 and two-layer N5, N6 coiling respectively.Wherein draw from the series connection point tap two-layer coil N3, the N4 of one group of secondary coil 41 series connection back, be that the head of N3 coil is electrically connected the back and at this electric connection point centre tap is set with the afterbody of N4 coil, or the afterbody of N3 coil is electrically connected with the head of N4 coil and then at this electric connection point centre tap is set.Also draw after two-layer secondary coil N5, the N6 series connection of another group secondary coil 42 from the series connection point tap, be that the head of N5 coil is electrically connected the back and from this electric connection point centre tap is set with the afterbody of N6 coil, or the afterbody of N5 coil is electrically connected with the head of N6 coil and then from this electric connection point centre tap is set.The enamelled wire diameter of described secondary winding 40 is all 0.40～0.60 millimeter.
Referring to Fig. 1 and Fig. 3, be provided with insulating barrier 50 between described secondary winding 40 and the described inside and outside two groups of primary coils 31,32, this insulating barrier 50 is heat-resisting 180 ℃ insulating material, but according to the actual conditions wrapped multiple.And all be provided with insulating barrier 51 between described secondary winding 40 each layers and between described elementary winding 30 each layers respectively, as between N1 and the N2 layer primary coil, between N7 and the N8 layer primary coil, between N3 and the N4 hierarchical level coil, between N4 and the N5 hierarchical level coil and all be provided with insulating barrier 51 between N5 and the N6 hierarchical level coil respectively; This insulating barrier 51 also is with heat-resisting 180 ℃ insulating material, but according to the actual conditions wrapped multiple.
Referring to Fig. 1 and Fig. 2, described winding skeleton 20 belows are provided with many pieces of stitch, corresponding with each stitch respectively electrical connection of each output conduction wire harness of described secondary coil 40; Each input conduction wire harness of described elementary winding 30 embeds in described two lead-in wire holddown grooves and the limited post thereof respectively and draws thus.
Referring to Fig. 1, Fig. 2 and Fig. 4, described winding skeleton 20 belows are provided with both sides totally six pieces of stitch, each three pieces of every sides.
Two bundle output conductor wires after described twice level coil N3, the N4 series connection are drawn from the whole line side of wrapping, after surface insulation layer 52 outside bendings downwards, be connected electrically in respectively on two pieces of stitch 1,7 at two ends, the same side, described winding skeleton 20 below then, be with insulated tube 53 respectively on this two bundle output conductor wire, among these twice level coil N3, N4 between tap be connected electrically on the stitch 4 in the middle of this same side, winding skeleton 20 below.
Two bundle output conductor wires after described twice level coil N5, the N6 series connection are drawn from the whole line side of wrapping, after surface insulation layer 52 outside bendings downwards, be connected electrically in respectively on two pieces of stitch 8,14 at other side two ends, described winding skeleton 20 belows then, be with insulated tube 53 respectively on this two bundle output conductor wire, among this two outer secondary coil N5, N6 between tap be connected electrically on the stitch 11 in the middle of this same side, winding skeleton 20 below.
Whole line bag is meant the primary coil 31 of internal layer, middle secondary winding 30 and outer field primary coil 32, and the insulating barrier between them 50,51, the outside had been wrapped up insulating barrier 52 again after they were assembled together, this insulating barrier 52 also is heat-resisting 180 ℃ insulating material, but according to the actual conditions wrapped multiple.
Referring to Fig. 1, Fig. 2 and Fig. 4, for the output current that makes secondary winding 40 does not concentrate on certain a bit, each is provided with four pieces of stitch 2,3,5,6,9,10,12,13 in addition again in the middle of the both sides, described winding skeleton 20 below, each seven pieces of stitch of promptly every side.Wherein two of described twice level coil N3, the N4 of one group secondary coil 41 bundle output conductor wires also are connected electrically in respectively on two pieces of stitch 2,6 at two ends, the same side, described winding skeleton 20 below simultaneously, among these twice level coil N3, N4 between tap also be connected electrically in simultaneously on two pieces of stitch 3,5 in the middle of this same side, winding skeleton 20 below.The two bundle output conductor wires of described twice level coil N5, the N6 of the secondary coil 42 of another group also are connected electrically in respectively on two pieces of stitch 9,13 at other side two ends, described winding skeleton 20 belows simultaneously, among these twice level coil N5, N6 between tap also be connected electrically in simultaneously on two pieces of stitch 10,12 in the middle of this same side, winding skeleton 20 below.In fact two pieces of stitch the 1, the 2nd, same electric connection point, two pieces of stitch 6,7 also are same electric connection points, three pieces of stitch 3,4,5 also are same electric connection points, two pieces of stitch the 8, the 9th, same electric connection point, two pieces of stitch 13,14 also are same electric connection points, and three pieces of stitch 10,11,12 also are same electric connection points.
Embodiment:
Referring to Fig. 1 to Fig. 4, a kind of high frequency transformer that is used for electric welding equipment, this high frequency transformer is applied on electric welding equipment such as the inverter welding machine, comprise that magnetic core 60 and top are provided with the winding skeleton 20 of two lead-in wire holddown grooves, and being wound on elementary winding 30 and secondary winding 40 on this winding skeleton 20, the material of magnetic core 60 is that high permeability manganese-zinc ferrite, model are EER42*15; Described elementary winding 30 comprises inside and outside two groups of primary coils 31,32, and described secondary winding 40 is between these inside and outside two groups of primary coils 31,32.
Described elementary winding 31 adopts multiply enamel-cover wire harness to divide two layers of coiling, is positioned at the position, innermost layer of whole line bag, promptly is positioned at the position of N1 and N2 layer, and the enamel-cover wire harness of each layer is 2 strands, and diameter is 0.50 millimeter, and the number of turns of coiling all is 21 circles.
Described elementary winding 32 also adopts multiply enamel-cover wire harness to divide two layers of coiling, is positioned at the outermost layer position of whole line bag, promptly is positioned at the position of N7 and N8 layer, and the enamel-cover wire harness of each layer is 2 strands, and diameter is 0.50 millimeter, and the number of turns of coiling all is 21 circles.
Two lead-in wire holddown grooves that embed described winding skeleton 20 after the same inscription end of four layers of primary coil N1, N2, N7 and N8 is electrically connected are respectively respectively also drawn thus.All be provided with the insulating barrier 51 of heat-resisting 180 ℃ of insulating material between every two-layer primary coil N1 and N2, N7 and the N8.
Described secondary winding 40 is positioned at the centre position of whole line bag, comprises two groups of secondary coils 41,42.
Described secondary coil 41 adopts multiply enamel-cover wire harness to divide two-layer coiling, is positioned at the position of N3 and N4 layer, and the enamel-cover wire harness of each layer is 12 strands, and diameter is 0.50 millimeter, and the number of turns of coiling all is 4 circles.The head of N3 hierarchical level coil is electrically connected the back and from this electric connection point centre tap is set with the afterbody of N4 hierarchical level coil, perhaps be that the afterbody of N31 hierarchical level coil is electrically connected with the head of N4 hierarchical level coil and then from this electric connection point centre tap is set.
Described secondary coil 42 also adopts the enamel-cover wire harness to divide two-layer coiling, is positioned at the position of N5 and N6 layer, and the enamel-cover wire harness of each layer is 12 strands, and diameter is 0.50 millimeter, and the number of turns of coiling all is 4 circles.The head of N5 hierarchical level coil is electrically connected the back and from this electric connection point centre tap is set with the afterbody of N6 hierarchical level coil, perhaps be that the afterbody of N5 hierarchical level coil is electrically connected with the head of N6 hierarchical level coil and then from this electric connection point centre tap is set.
All be provided with the insulating barrier 51 of heat-resisting 180 ℃ of insulating material between N3 hierarchical level coil and N4 hierarchical level coil, N4 hierarchical level coil and N5 hierarchical level coil, N5 hierarchical level coil and the N6 hierarchical level coil.All be provided with the insulating barrier 50 of heat-resisting 180 ℃ of insulating material between N3 hierarchical level coil and N2 layer primary coil and N6 hierarchical level coil and the N7 layer primary coil.
Both sides, winding skeleton 20 below are provided with totally ten four pieces of stitch, each seven pieces of every sides; Two bundle output conductor wires after N3 hierarchical level coil and the series connection of N4 hierarchical level coil are drawn from the whole line side of wrapping, be connected electrically in four pieces of stitch 1,2 at two ends, the same side, described winding skeleton 20 below then after the outside bendings downwards of surface insulation layer 52 respectively, 6, on 7, be that a branch of output conductor wire is connected electrically on two pieces of stitch 1,2 simultaneously, another bundle output conductor wire is connected electrically on two pieces of stitch 6,7 simultaneously, is with insulated tube 53 respectively on this two bundles output conductor wire; Tap is connected electrically on the middle three pieces of stitch 3,4,5 in this same side, winding skeleton 20 below simultaneously between among these twice level coil N3, N4.Two bundle output conductor wires in the N5 layer after the series connection of secondary coil and N6 hierarchical level coil are drawn from the whole line side of wrapping, be connected electrically in four pieces of stitch 8,9 at other side two ends, described winding skeleton 20 belows then after the outside bendings downwards of surface insulation layer 52,13, on 14, be that a branch of output conductor wire is connected electrically on two pieces of stitch 8,9 simultaneously, another bundle output conductor wire is connected electrically on two pieces of stitch 13,14 simultaneously, is with insulated tube 53 respectively on this two bundles output conductor wire; Tap is connected electrically on the middle three pieces of stitch 10,11,12 in this same side, winding skeleton 20 below simultaneously between among these twice level coil N5, N6.
14 pieces of stitch by winding skeleton 20 lower ends, described high frequency transformer directly can be welded on the wiring board in the electric welding equipment, on this wiring board, three pieces of stitch the 3,4, the 5th of winding skeleton 20 lower ends are electrically connected, two pieces of stitch 1,2 also are electrically connected, two pieces of stitch 6,7 also are electrically connected, three pieces of stitch 10,11,12 also are electrically connected, two pieces of stitch 8,9 also are electrically connected, and two pieces of stitch 13,14 also are electrically connected.And one or more described high frequency transformers can be adopted parallel connection or series system directly are welded on the interior wiring board of electric welding equipment convenient production in enormous quantities the in enormous quantities.
Described high frequency transformer adopts above-mentioned specifications parameter, can export 2 kw of power under the 110kHz operating frequency, and the temperature rise of each coil is very low, temperature rise value up to specification, and output current is highly stable.
The utility model high frequency transformer is provided with and the coiling mode by adopting above-mentioned each coil, each coil is by best impedance matching, makes the utility model high frequency transformer have high power volume ratio, high workload frequency, low magnetism leakage, good advantages such as heat radiation, high efficiency, stable output current, high insulation resistance and convenient installation.
The above embodiment has only expressed preferred implementation of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim; Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection range of the present utility model; Therefore, all equivalents and modifications of being done with the utility model claim scope all should belong to the covering scope of the utility model claim.
Claims (10)
1. a high frequency transformer that is used for electric welding equipment comprises that magnetic core (60) and top are provided with the winding skeleton (20) of two lead-in wire holddown grooves, and is wound on elementary winding (30) and secondary winding (40) on this winding skeleton (20); It is characterized in that:
Described elementary winding (30) comprises inside and outside two groups of primary coils (31,32), and described secondary winding (40) is positioned between these inside and outside two groups of primary coils (31,32).
2. the high frequency transformer that is used for electric welding equipment according to claim 1 is characterized in that:
Described elementary winding (30) adopts multiply enamel-cover wire harness to divide four layers of (N1, N2, N7, N8) coiling, wherein internal layer primary coil (31) is provided with two-layer (N1, N2), outer primary coil (32) also is provided with two-layer (N7, N8), and the same inscription end of each layer primary coil is electrically connected respectively.
3. the high frequency transformer that is used for electric welding equipment according to claim 2 is characterized in that:
The enamelled wire diameter of described elementary winding (30) is 0.40～0.60 millimeter.
4. the high frequency transformer that is used for electric welding equipment according to claim 1 is characterized in that:
Described secondary winding (40) comprises two groups of secondary coils (41,42), adopts multiply enamel-cover wire harness to divide two layers of (N3, N4, N5, N6) coiling respectively; Wherein the two-layer secondary coil of one group of secondary coil (41) (N3, N4) series connection back is provided with centre tap from series connection point, also from series connection point centre tap is set after two-layer secondary coil (N5, the N6) series connection of another group secondary coil (42).
5. the high frequency transformer that is used for electric welding equipment according to claim 4 is characterized in that:
The enamelled wire diameter of described secondary winding (40) is 0.40～0.60 millimeter.
6. the high frequency transformer that is used for electric welding equipment according to claim 5 is characterized in that:
Be provided with insulating barrier (50) between described secondary winding (40) and the described inside and outside two groups of primary coils (31,32).
7. the high frequency transformer that is used for electric welding equipment according to claim 6 is characterized in that:
All be provided with insulating barrier (51) respectively between each layer of described secondary winding (40) and between each layer of described elementary winding (30).
8. according to each described high frequency transformer that is used for electric welding equipment of claim 1～7, it is characterized in that:
Described winding skeleton (20) below is provided with many pieces of stitch, corresponding with each stitch respectively electrical connection of each output conduction wire harness of described secondary coil (40); Each input conduction wire harness of described elementary winding (30) embeds described winding skeleton (20) top two lead-in wire holddown grooves respectively and draws thus.
9. according to each described high frequency transformer that is used for electric welding equipment of claim 4～7, it is characterized in that:
Described winding skeleton (20) below is provided with both sides totally six pieces of stitch, each three pieces of every sides;
Two bundle output conductor wires after described twice level coils (N3, N4) series connection are drawn from the whole line side of wrapping, after the outside bending downwards of surface insulation layer (52), be connected electrically in respectively on two pieces of stitch (1,7) at two ends, the same side, described winding skeleton (20) below then, be with insulated tube (53) respectively on this two bundle output conductor wire, among these twice level coils (N3, N4) between tap be connected electrically on the stitch (4) in the middle of this same side, winding skeleton (20) below;
Two bundle output conductor wires after described twice level coils (N5, N6) series connection are drawn from the whole line side of wrapping, after the outside bending downwards of surface insulation layer (52), be connected electrically in respectively on two pieces of stitch (8,14) at other side two ends, described winding skeleton (20) below then, be with insulated tube (53) respectively on this two bundle output conductor wire, among this two outer secondary coil (N5, N6) between tap be connected electrically on the stitch (11) in the middle of this same side, winding skeleton (20) below.
10. the high frequency transformer that is used for electric welding equipment according to claim 9 is characterized in that:
Each is provided with four pieces of stitch (2,3,5,6,9,10,12,13) in addition again both sides, described winding skeleton (20) below, each seven pieces of stitch of promptly every side;
Two bundle output conductor wires of described twice level coils (N3, N4) also are connected electrically in respectively on two pieces of stitch (2,6) at two ends, the same side, described winding skeleton (20) below simultaneously, among these twice level coils (N3, N4) between tap also be connected electrically in simultaneously on two pieces of stitch (3,5) in the middle of this same side, winding skeleton (20) below;
Two bundle output conductor wires of described twice level coils (N5, N6) also are connected electrically in respectively on two pieces of stitch (9,13) at other side two ends, described winding skeleton (20) below simultaneously, among these twice level coils (N5, N6) between tap also be connected electrically in simultaneously on two pieces of stitch (10,12) in the middle of this same side, winding skeleton (20) below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202135696U CN201327765Y (en) | 2008-11-17 | 2008-11-17 | High-frequency transformer for electric welding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202135696U CN201327765Y (en) | 2008-11-17 | 2008-11-17 | High-frequency transformer for electric welding device |
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| Publication Number | Publication Date |
|---|---|
| CN201327765Y true CN201327765Y (en) | 2009-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202135696U Expired - Lifetime CN201327765Y (en) | 2008-11-17 | 2008-11-17 | High-frequency transformer for electric welding device |
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| CN (1) | CN201327765Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360731A (en) * | 2011-10-18 | 2012-02-22 | 江苏达胜加速器制造有限公司 | Double-pie solenoid high-frequency transformer |
| CN111667999A (en) * | 2020-06-24 | 2020-09-15 | 江苏充邦新能源有限公司 | Transformer for electric vehicle charger |
| CN112259366A (en) * | 2020-10-19 | 2021-01-22 | 无锡汇普电子有限公司 | Winding method of electronic transformer for charger |
-
2008
- 2008-11-17 CN CNU2008202135696U patent/CN201327765Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360731A (en) * | 2011-10-18 | 2012-02-22 | 江苏达胜加速器制造有限公司 | Double-pie solenoid high-frequency transformer |
| CN102360731B (en) * | 2011-10-18 | 2012-11-28 | 江苏达胜加速器制造有限公司 | Double-pie solenoid high-frequency transformer |
| CN111667999A (en) * | 2020-06-24 | 2020-09-15 | 江苏充邦新能源有限公司 | Transformer for electric vehicle charger |
| CN112259366A (en) * | 2020-10-19 | 2021-01-22 | 无锡汇普电子有限公司 | Winding method of electronic transformer for charger |
| CN112259366B (en) * | 2020-10-19 | 2022-07-01 | 无锡汇普电子有限公司 | Winding method of electronic transformer for charger |
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Address after: Shop No. four, Phoenix fourth industrial zone, Fuyong street, Fuyong Town, Shenzhen, Guangdong, Baoan District 518103, China Patentee after: Shenzhen Riland Industry Co., Ltd. Address before: Shop No. four, Phoenix fourth industrial zone, Fuyong street, Fuyong Town, Shenzhen, Guangdong, Baoan District 518103, China Patentee before: Shenzhen Riland Industry Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20091014 |
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| CX01 | Expiry of patent term |