CN110534316B - Resonant transformer - Google Patents
Resonant transformer Download PDFInfo
- Publication number
- CN110534316B CN110534316B CN201911006224.2A CN201911006224A CN110534316B CN 110534316 B CN110534316 B CN 110534316B CN 201911006224 A CN201911006224 A CN 201911006224A CN 110534316 B CN110534316 B CN 110534316B
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- CN
- China
- Prior art keywords
- winding
- iron core
- primary
- column
- metal sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004804 winding Methods 0.000 claims abstract description 155
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000002184 metal Substances 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 37
- 238000002955 isolation Methods 0.000 claims description 20
- 238000009413 insulation Methods 0.000 claims description 8
- 125000006850 spacer group Chemical group 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 10
- 230000000903 blocking effect Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2847—Sheets; Strips
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
The invention discloses a resonant transformer, which comprises a primary winding, a secondary winding and a winding iron core used for fixing the primary winding and the secondary winding; the winding iron core is provided with a first iron core column used for fixing the primary winding and a second iron core column used for fixing the secondary winding; the secondary winding comprises a secondary side line frame for winding the auxiliary winding and a metal sheet wound on the second iron core column and serving as a secondary winding coil, and the secondary side line frame is sleeved on the second iron core column. The resonant transformer provided by the invention has the advantages of relatively small volume, higher output power density and current density and good heat dissipation performance.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a resonant transformer.
Background
In practical application, the common LLC resonant type magnetic integrated transformer has the advantages that the primary winding and the secondary winding are simultaneously wound on different positions of a single wire frame (a winding base), and quite labor is consumed for inserting the heat insulation sleeve, the wire connection and the like besides the winding, so that the labor and the working hours are increased; meanwhile, the primary winding and the secondary winding are arranged on the same wire frame, so that the defects of insufficient safety distance, poor leakage inductance consistency and the like are easily caused, and extra inductance is required to be added to serve as resonance inductance. When the output current is larger, a multi-strand wire is adopted to wind the secondary side winding, but the wire is difficult to be led out and connected because the number of the enameled wires is excessive, and gaps are generated among all the wires (enameled wires), so that the volume of the winding and even the transformer can not be reduced, and the heat dissipation performance of the transformer is poor.
Therefore, how to optimize the structure of the resonant transformer, reduce the volume of the resonant transformer, and improve the heat dissipation performance of the resonant transformer is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a resonant transformer which has smaller overall volume, high output power density and output current density and better heat dissipation performance.
In order to achieve the above object, the present invention provides a resonant transformer including a primary winding, a secondary winding, and a winding core for fixing the primary winding and the secondary winding;
the winding iron core is provided with a first iron core column used for fixing the primary winding and a second iron core column used for fixing the secondary winding;
The secondary winding comprises a secondary side line frame for winding the auxiliary winding and a metal sheet wound on the second iron core column and serving as a secondary winding coil, and the secondary side line frame is sleeved on the second iron core column.
Optionally, the metal sheet includes a ring portion for winding the second core limb, and further includes a current output terminal for outputting current, which is bent and extended with respect to both ends of the ring portion.
Optionally, the metal sheet is a copper sheet.
Optionally, the primary winding includes a primary winding coil and a primary side winding frame for winding the primary winding coil, and the primary side winding frame is sleeved on the first core leg.
Optionally, the primary side frame comprises a pair of primary side baffles arranged in parallel relatively and a primary side spacer arranged between the pair of primary side baffles;
The primary side spacer and the pair of primary side baffles form two primary side wire frame grooves for winding the primary winding coil, and the primary side wire frame groove further comprises a primary side connecting terminal arranged at the bottom of the primary side wire frame.
Optionally, an isolation cover for isolating the primary winding and the secondary winding is further arranged between the primary winding and the secondary winding.
Optionally, the isolation cover is in a notch shape, and a side edge for slidably clamping a pair of the primary side baffles is arranged at the notch of the isolation cover.
Optionally, the secondary winding further comprises a secondary side wire frame for sleeving the secondary side wire frame;
The secondary side line frame is provided with a secondary side baffle plate which is arranged oppositely and used for accommodating the secondary side line frame, and the secondary side line frame also comprises a secondary side wiring terminal which is arranged at the bottom of the secondary side line frame and used for connecting an auxiliary winding.
Optionally, the secondary side frame is in a notch shape, and the notch of the secondary side frame and the notch of the isolation cover are arranged back to back.
Optionally, the winding iron core includes that the relative setting iron core goes up post and iron core down the post, the iron core go up the post with the iron core down the post all include iron core seat and perpendicular two iron core posts that the iron core seat extends, the iron core go up the post with the iron core down the iron core post dock each other in order to form first iron core post with second iron core post.
Compared with the background art, the resonant transformer provided by the invention comprises a winding iron core, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are fixed on a first iron core column and a second iron core column of the winding iron core respectively, and the secondary winding comprises a secondary side wire frame for winding an auxiliary winding and a metal sheet wound on the second iron core column for serving as a secondary winding coil. The leakage inductance of the auxiliary winding serves as a resonant inductance, and the metal sheet is used as a secondary winding coil to replace a traditional enameled wire winding coil, so that the distance between wires in the winding coil is reduced, the height of the secondary winding coil is reduced, the resonant transformer is flat, the volume is reduced, the cross-sectional area of the secondary winding coil is enlarged due to the flat shape, and the resonant transformer is more beneficial to heat dissipation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is an overall structure diagram of a resonant transformer according to an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a cross-sectional view of C-C of FIG. 2;
FIG. 4 is a front view of FIG. 1;
FIG. 5 is a cross-sectional view B-B of FIG. 4;
Fig. 6 is an exploded view of fig. 1.
Wherein:
The high-voltage transformer comprises a 1-iron core upper column, a 2-iron core lower column, a 3-primary side wire frame, a 31-primary side baffle, a 32-primary side spacer, a 33-primary side wiring terminal, a 4-primary winding coil, a 5-isolation cover, a 51-side folded edge, a 6-secondary side wire frame, a 7-metal sheet, a 71-current output terminal, an 8-secondary side wire frame, an 81-secondary side baffle and an 82-secondary side wiring terminal.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present invention.
Referring to fig. 1 to 6, fig. 1 is a block diagram of a resonant transformer according to an embodiment of the present invention; FIG. 2 is a top view of FIG. 1; FIG. 3 is a cross-sectional view of C-C of FIG. 2; FIG. 4 is a front view of FIG. 1; FIG. 5 is a cross-sectional view B-B of FIG. 4; fig. 6 is an exploded view of fig. 1.
The resonant transformer provided by the invention comprises a primary winding, a secondary winding and a winding iron core, wherein the primary winding and the secondary winding are respectively wound on a first iron core column and a second iron core column of the winding iron core; the secondary winding comprises a secondary side line frame 6 for winding an auxiliary winding and a metal sheet 7 serving as a secondary winding coil, wherein the metal sheet 7 is wound on the second iron core column, the width direction of the metal sheet 7 is perpendicular to the length direction of the second iron core column and serves as a secondary winding coil, working current is output with the primary winding coil 4 through mutual inductance, and the auxiliary winding serves as a resonant inductor. The secondary winding adopts the metal sheet 7 to replace the enameled wire to serve as a secondary winding coil, the space between wires (enameled wires of the secondary winding) is reduced, the height of the secondary winding coil is obviously reduced, the height and the volume of the transformer are reduced, the resonant transformer is flat as a whole, the cross-sectional area of the secondary winding coil is enlarged, the heat dissipation performance is good, and the heat dissipation effect of the metal sheet 7 is better compared with that of the multi-turn enameled wires.
The resonant transformer provided by the invention is described in more detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 6, in one embodiment of the present invention, a flat resonant transformer includes a primary winding, a secondary winding, and a winding core; the winding iron core is formed by splicing an upper iron core column 1 and a lower iron core column 2, the upper iron core column 1 and the lower iron core column 2 are basically symmetrical in structure, each iron core column comprises an iron core seat and two iron core columns extending perpendicular to the iron core seat, the iron core columns of the upper iron core column 1 and the lower iron core column 2 are mutually matched in size, and the intervals of the iron core columns of the upper iron core column 1 and the lower iron core column 2 are identical, so that the first iron core column used for fixing a primary winding and the second iron core column used for fixing a secondary winding are formed by mutually splicing.
The primary winding comprises a primary side wire frame 3 and a primary winding coil 4, the primary winding coil 4 is wound on the primary side wire frame 3, the primary side wire frame 3 is sleeved on the first iron core column, and the primary winding can be conveniently maintained by mutually separating or splicing the iron core upper column 1 and the iron core lower column 2. Further, as shown in fig. 1, the primary side bobbin 3 may include a pair of primary side blocking pieces disposed oppositely, a primary side spacer 32 disposed between the pair of primary side blocking pieces, two primary side bobbin slots for winding and fixing the primary winding coil 4 formed between the primary side blocking pieces and the primary side spacer 32, and a primary side connection terminal 33 for connecting the primary side winding coil 4 disposed at the bottom of the primary side bobbin 3. In other words, the primary side bobbin slots for accommodating the primary winding coils 4 are formed by the alternating arrangement of the primary side blocking pieces and the primary side separating pieces 32, and the arrangement form of the primary winding is described above by way of specific embodiments only, and it should not be construed that the specific limitation of the primary winding structure is imposed, and the number of the primary side blocking pieces or the primary side separating pieces 32 may be adjusted as needed, that is, the number of the primary side bobbin slots may be specifically set according to the needs of the primary winding coils 4.
The secondary winding comprises a secondary side line frame 6 sleeved on the second iron core column, and the secondary side line frame 6 is used for winding an auxiliary winding; the second core limb is also wound with a metal sheet 7 serving as a secondary side winding coil, and as a core improvement point of the invention, the second core limb is wound by adopting the metal sheet 7, and the metal sheet 7 and the primary winding coil 4 are mutually transformed to generate voltage transformation and output working current. The structure of the metal sheet 7 wound around the second core leg may refer to fig. 6, and it should be noted that the metal winding manner shown in fig. 6 is only a schematic illustration, and does not mean that the metal sheet 7 winds around the second core leg only one turn, and the metal sheet 7 may wind around the second core leg for multiple turns, and insulation is provided between the layers of the metal sheet 7 according to the transformation ratio and actual requirements of the resonant transformer; the metal sheet 7 is preferably a copper sheet, and the copper sheet has good electric conductivity and heat dissipation performance. The metal sheet 7 includes a ring portion wound around the second core limb, and further includes current output terminals 71 bent and extended downward along both ends of the ring portion, and the current output terminals 71 may be connected to a circuit board or a wire to output an operating current outward.
The metal sheets 7 may be plural, and the plural metal sheets 7 are disposed above or below the secondary side frame 6, respectively, or are disposed symmetrically about the upper and lower sides of the secondary side frame 6. In order to ensure the insulation effect between the primary winding and the secondary winding and prevent breakdown, an isolation cover 5 for isolating the primary winding and the secondary winding is further arranged between the primary winding and the secondary winding, the insulation distance between the primary winding and the secondary winding is ensured to be larger than 6mm by arranging the isolation cover 5, and the operation safety of the resonant transformer is ensured. The isolation groove is in a notch shape, and the notch of the isolation groove is used for being sleeved on the primary side wire frame 3. Furthermore, the notch of the isolation groove is provided with a side flange 51 for slidably clamping the pair of primary side baffles 31, the primary side baffles 31 are provided with corresponding sliding grooves, the sliding rails are arranged on the side flange 51 to enable the sliding rails to be matched with the sliding grooves, and the isolation groove is sleeved on the primary side baffles 31 of the primary side frame 3 to form insulation isolation for the primary winding and the secondary winding.
As another core of the invention, the distance between the primary side wire frame 3 and the secondary side wire frame 6 is effectively controlled by the arrangement of the isolation cover 5, and the characteristics of leakage inductance and the like of the resonant transformer are controlled; and the metal sheet 7 is adopted to replace the enameled wire to serve as a secondary winding coil, so that the cross section area of the secondary winding is enlarged, and the heat dissipation performance of the transformer is improved.
In another preferred embodiment of the present invention, the secondary winding further includes a secondary side frame 8 sleeved on the outer periphery of the secondary side frame 6, the secondary side frame 8 has a pair of opposite secondary side baffles 81, the pair of secondary side baffles 81 are used for clamping and accommodating the secondary side frame 6, a secondary side connection terminal 82 is further disposed at the bottom of the secondary side frame 8, and the secondary side connection terminal 82 is further connected to the auxiliary winding.
The secondary side line frame 8 is also in a notch shape, so that the secondary side line frame 6 can be conveniently slid into the notch fixed to the secondary side line frame 8 through the notch, the notch of the secondary side line frame 8 and the notch of the isolation cover 5 are arranged in a back way, the secondary side line frame 8 not only provides a wiring terminal of an auxiliary winding, but also further ensures the insulation isolation of the primary winding and the secondary winding, and simultaneously, the secondary side line frame 6 is fixed. Fig. 2 to 5 clearly illustrate the assembly relationship of the resonant transformer by combining sectional views in different directions with exploded views.
The resonant transformer provided by the invention adopts the metal sheet 7 as the secondary winding coil, so that the resonant transformer is flat, the cross section area of the secondary winding coil is increased, the heat dissipation performance is good, the insulation distance between the primary winding and the secondary winding is effectively controlled by the arrangement of the isolation cover 5, and the operation safety of the resonant transformer is ensured.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The resonant transformer provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (3)
1. A resonant transformer, comprising a primary winding, a secondary winding and a winding core for fixing the primary winding and the secondary winding;
the winding iron core is provided with a first iron core column used for fixing the primary winding and a second iron core column used for fixing the secondary winding;
the secondary winding comprises a secondary side wire frame (6) used for winding an auxiliary winding and a metal sheet (7) wound on the second iron core column and used as a secondary winding coil, wherein the metal sheet (7) is wound on the second iron core column, the width direction of the metal sheet (7) is perpendicular to the length direction of the second iron core column, the secondary side wire frame (6) is sleeved on the second iron core column, the metal sheet (7) and a primary winding coil (4) of the primary winding are mutually transformed to generate voltage transformation and output working current, the metal sheet (7) is wound on the second iron core column only for one circle, or the metal sheet (7) is wound on the second iron core column for multiple circles, insulation is arranged between layers of the metal sheet (7), or a plurality of metal sheets (7) are respectively arranged above or below the secondary side wire frame (6), or a plurality of metal sheets (7) are symmetrically arranged on the upper side and lower sides of the secondary side wire frame (6);
The primary winding comprises a primary winding coil (4) and a primary side wire frame (3) used for winding the primary winding coil (4), and the primary side wire frame (3) is sleeved on the first iron core column; the primary side wire frame (3) comprises a pair of primary side baffles (31) which are arranged in parallel relatively and a primary side spacer (32) arranged between the pair of primary side baffles (31); the primary side spacer (32) and the pair of primary side baffles (31) form two primary side wire frame grooves for winding the primary winding coil (4), and the primary side wire frame structure further comprises a primary side connecting terminal (33) arranged at the bottom of the primary side wire frame (3); an isolation cover (5) for isolating the primary winding and the secondary winding is also arranged between the primary winding and the secondary winding; the isolation cover (5) is in a notch shape, and a side folded edge (51) for slidably clamping a pair of primary side baffles (31) is arranged at the notch of the isolation cover (5);
The secondary winding also comprises a secondary side line frame (8) used for sleeving the secondary side line frame (6);
The secondary side line frame (8) is provided with secondary side baffles (81) which are oppositely arranged and used for accommodating the secondary side line frame (6), and further comprises secondary side terminal (82) which are arranged at the bottom of the secondary side line frame (8) and used for connecting auxiliary windings; the secondary side line frame (8) is in a notch shape, and the notch of the secondary side line frame (8) and the notch of the isolation cover (5) are arranged in a back way; the winding iron core comprises an iron core upper column (1) and an iron core lower column (2) which are oppositely arranged, wherein the iron core upper column (1) and the iron core lower column (2) both comprise an iron core seat and two iron core columns which are perpendicular to the iron core seat and extend, and the iron core upper column (1) and the iron core lower column (2) are mutually butted to form a first iron core column and a second iron core column.
2. A resonant transformer according to claim 1, characterized in that the metal sheet (7) comprises a loop portion for winding the second core limb, and further comprises current output terminals (71) extending in turning relation to both ends of the loop portion for outputting a current.
3. A resonant transformer according to claim 2, characterized in that the metal sheet (7) is a copper sheet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910458259.3A CN110085400A (en) | 2019-05-29 | 2019-05-29 | A kind of resonance transformer |
| CN2019104582593 | 2019-05-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110534316A CN110534316A (en) | 2019-12-03 |
| CN110534316B true CN110534316B (en) | 2024-10-22 |
Family
ID=67422509
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910458259.3A Withdrawn CN110085400A (en) | 2019-05-29 | 2019-05-29 | A kind of resonance transformer |
| CN201911006224.2A Active CN110534316B (en) | 2019-05-29 | 2019-10-22 | Resonant transformer |
| CN201921785662.9U Active CN210378713U (en) | 2019-05-29 | 2019-10-22 | Resonant transformer |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910458259.3A Withdrawn CN110085400A (en) | 2019-05-29 | 2019-05-29 | A kind of resonance transformer |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921785662.9U Active CN210378713U (en) | 2019-05-29 | 2019-10-22 | Resonant transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN110085400A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110085400A (en) * | 2019-05-29 | 2019-08-02 | 杭州中恒派威电源有限公司 | A kind of resonance transformer |
| CN112420357B (en) * | 2020-10-26 | 2022-08-16 | 东莞市优琥电子科技有限公司 | Integrated transformer and electrical equipment |
| CN113345697A (en) * | 2021-06-07 | 2021-09-03 | 合肥市菲力克斯电子科技有限公司 | Ultrathin electronic transformer for LED television |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105761905A (en) * | 2016-01-30 | 2016-07-13 | 明纬(广州)电子有限公司 | Resonant type high-current-density transformer |
| CN210378713U (en) * | 2019-05-29 | 2020-04-21 | 杭州中恒派威电源有限公司 | Resonant transformer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000357614A (en) * | 1999-06-15 | 2000-12-26 | Kitamura Kiden Kk | Chamber type transformer and coil bobbin thereof |
| ATE491214T1 (en) * | 2002-10-01 | 2010-12-15 | Det Int Holding Ltd | BOBBIN |
| JPWO2015025392A1 (en) * | 2013-08-22 | 2017-03-02 | 三菱電機株式会社 | Transformer |
| TWI581280B (en) * | 2016-08-24 | 2017-05-01 | Yujing Technology Co Ltd | Improved Structure of Resonant High Current Density Transformer |
-
2019
- 2019-05-29 CN CN201910458259.3A patent/CN110085400A/en not_active Withdrawn
- 2019-10-22 CN CN201911006224.2A patent/CN110534316B/en active Active
- 2019-10-22 CN CN201921785662.9U patent/CN210378713U/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105761905A (en) * | 2016-01-30 | 2016-07-13 | 明纬(广州)电子有限公司 | Resonant type high-current-density transformer |
| CN210378713U (en) * | 2019-05-29 | 2020-04-21 | 杭州中恒派威电源有限公司 | Resonant transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN210378713U (en) | 2020-04-21 |
| CN110534316A (en) | 2019-12-03 |
| CN110085400A (en) | 2019-08-02 |
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Country or region after: China Address after: Room 501, Building 5, No. 425, Miaohouwang Road, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province, 310000 Applicant after: Zhejiang Paiwei Digital Technology Co.,Ltd. Applicant after: WUHAN STREET LAMP MANAGEMENT SERVICE CENTER Address before: 1st Floor, Building 2, No. 69, Dongxin Avenue, Binjiang District, Hangzhou City, Zhejiang Province, 310000 Applicant before: HANGZHOU ZHONGHENG POWER ENERGY CO.,LTD. Country or region before: China Applicant before: WUHAN STREET LAMP MANAGEMENT SERVICE CENTER |
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