• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In the method of manufacturing a multilayer ceramic transformer of the present invention, a primary coil pattern and a secondary coil pattern having a first exposure electrode and a second exposure electrode are printed on both ends of the first green sheet and the second green sheet, respectively. Subsequently, the printed green sheets are respectively rolled up and wound around a ferrite molded body, and the ferrite green sheets are rolled up around each outside thereof to form a first ceramic coil stack and a second ceramic coil stack. Next, the first ceramic coil stack and the second ceramic coil stack are respectively cut to form a primary coil stack and a secondary coil stack. A lower ferrite green sheet having a first lead electrode connected to the first exposed electrode at a lower portion of the primary coil laminate, and a second lead electrode connected to the second exposed electrode at an upper portion of the secondary coil laminate. An upper ferrite green sheet having a laminated structure is prepared and sintered.
    公开号:KR19990034422A
    申请号:KR1019970056027
    申请日:1997-10-29
    公开日:1999-05-15
    发明作者:장동석；성재석；구기덕；이우성
    申请人:김춘호；전자부품연구원；
    IPC主号:
    专利说明:

    Manufacturing method of multilayer ceramic transformer
    The present invention relates to a method of manufacturing a multilayer ceramic transformer, and a method of manufacturing a multilayer ceramic transformer having an internal structure in which leakage magnetic flux is minimized by a simple process.
    In general, a conventional method of manufacturing a multilayer ceramic transformer is to form a micro hole in a green sheet made of a high permeability ferrite, fill a conductor therein, and then print an electrode pattern to laminate a plurality of green sheets to form a coil shape. will be. However, in this case, since both the coil forming portion and the other portion are high permeability materials, leakage magnetic flux occurs in the coil. In order to reduce the leakage magnetic flux, a method of forming the coil forming part with a low permeability material has been proposed.
    1A to 1H are diagrams for explaining a method of manufacturing a multilayer ceramic transformer according to the prior art.
    Specifically, a green sheet 2 having a high permeability (hereinafter, referred to as a relative permeability of about 50 to 1000) is formed on the base film 1 (see FIG. 1A). Subsequently, the cutting groove 3 is formed in the outer shape of the coil using a laser at a predetermined position of the green sheet 2 (see FIG. 1B).
    Next, an adhesive-coated material film 4 is laminated in the shape of a cut coil of the green sheet 2 and bonded to the cut portion of the green sheet 2 (see FIG. 1C). Next, the cut portion of the green sheet 2 is peeled off together with the material film 4 (see FIG. 1D).
    Subsequently, the conductive paste 5 having a low permeability (hereinafter, referred to as a relative permeability of about 1 to 10) is filled in the portion where the green sheet 2 on the base film 1 is removed (see FIG. 1E). ). Next, a through hole 6 is formed at a predetermined position of the conductive paste 5 (see FIG. 1F). Next, after printing the primary coil pattern 7 on the portion filled with the conductive paste 5, the base film 1 is peeled off to form a green sheet for the primary coil (see FIG. 1G).
    Subsequently, the laminated ceramic transformer is completed as shown in FIG. 1H by forming and compressing the green sheet for the secondary coil in the same manner as described above. FIG. 1H shows a state in which the primary coil 9 and the secondary coil 8 are embedded. In particular, in the multilayer ceramic transformer shown in FIG. 1H, since the circumference of the spiral pattern of the coil 7 is entirely formed of the low permeability material 12, and the other part 11 is a high permeability material, Magnetic flux leakage between spiral patterns can be prevented. Accordingly, the primary side energy can be transferred to the secondary side excellently.
    However, the conventional multilayer transformer manufacturing method has a disadvantage in that the manufacturing cost increases due to the complicated and difficult process for making the coil forming part of the internal coil forming part into a low permeability material. There is a problem.
    In addition, the conventional multilayer transformer manufacturing method has a disadvantage in that it is difficult to achieve highly reliable interlayer connection due to the deviation in the process of filling the conductive paste in the via hole and the minute deviation in the alignment process when the multiple layers are connected using the via hole. .
    Accordingly, the technical problem of the present invention is to solve the above-mentioned problems and to provide a method of manufacturing a multilayer ceramic transformer in a simple process.
    1A to 1H are diagrams for explaining a method of manufacturing a multilayer ceramic transformer according to the prior art.
    2 to 5 are views for explaining a method of manufacturing a multilayer ceramic transformer according to an embodiment of the present invention.
    6 and 7 are diagrams for explaining a method of manufacturing a multilayer ceramic transformer according to another embodiment of the present invention.
    FIG. 8 is a cross-sectional view of the multilayer ceramic transformer of the present invention shown in FIGS. 2 to 5.
    In order to achieve the above technical problem, the method of manufacturing a multilayer ceramic transformer of the present invention is a primary coil pattern and a secondary coil having a first exposed electrode and a second exposed electrode on both ends of the first green sheet and the second green sheet, respectively. Printing a pattern, rolling the first green sheet and the second green sheet on which the primary coil pattern and the secondary coil pattern are formed, respectively, on a ferrite molded body, and the first green sheet and the first wound around the ferrite molded body. Rolling a ferrite green sheet on each outside of the green sheet to form a first ceramic coil stack and a second ceramic coil stack, and cutting the first ceramic coil stack and the second ceramic coil stack, respectively 1 Forming a primary coil stack and a secondary coil stack, and having a first lead electrode connected to the first exposed electrode under the primary coil stack. Providing and stacking an upper ferrite green sheet having a light green sheet and a second lead electrode connected to the second exposure electrode on the secondary coil stack; and the primary and secondary coil stacks; Sintering the upper and lower ferrite green sheets to form a laminate, and connecting the first and second lead electrodes of the primary coil laminate and the secondary coil laminate to the outside of the laminate, respectively. Forming a first external terminal electrode and a second external terminal electrode.
    The primary coil pattern and the secondary coil pattern are formed of any one conductive paste selected from Ag, Cu, and Au. Sintering of the primary and secondary coil laminates and the upper and lower ferrite green sheets is performed at 850 to 900 ° C. The first green sheet and the second green sheet are formed using a tape casting method of glass and ceramic material. The ferrite molded body is molded in the form of a square pillar, and the ferrite green sheet is molded in a sheet state by a tape casting method.
    In addition, the method of manufacturing a multilayer ceramic transformer of the present invention comprises the steps of printing a primary coil pattern and a secondary coil pattern having a first exposed electrode and a second exposed electrode on both ends of the green sheet, the primary coil pattern and the second Winding the green sheet having the difference coil pattern formed on a ferrite molded body, rolling the ferrite green sheet outside the green sheet rolled on the ferrite molded body to form a ceramic coil laminate, and cutting the ceramic coil laminate by cutting Forming a coil stack having a primary coil pattern and a secondary coil pattern formed thereon, a lower ferrite green sheet having a first lead electrode connected to a first exposure electrode at a lower portion and an upper portion of the coil stack; Providing an upper ferrite green sheet having a second lead electrode connected to a second exposed electrode, the coil stack and upper and lower ferrules Stacking and sintering the light green sheet to form a laminate; a first external terminal electrode and a second external terminal electrode connected to the first lead electrode and the second lead electrode of the coil laminate outside the laminate; Forming a step.
    The primary coil pattern and the secondary coil pattern are formed of any one conductive paste selected from Ag, Cu, and Au. Sintering of the coil laminate and the upper and lower ferrite green sheets is performed at 850 to 900 ° C. The green sheet is formed using a tape casting method of glass and ceramic material. The method of claim 1, wherein the ferrite molded body is molded in the form of a square pillar, the ferrite green sheet is used in the sheet state by a tape casting method.
    The present invention can greatly simplify the manufacturing process and the coil pattern is simple to eliminate the problems that can occur during the interlayer connection of the prior art.
    Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
    2 to 5 are views for explaining a method of manufacturing a multilayer ceramic transformer according to a first embodiment of the present invention.
    Referring to FIG. 2, the primary coil pattern 23 and the secondary coil pattern 33 are printed on the first green sheet 21 and the second green sheet 31 of ceramic with conductive paste, respectively. At this time, the first exposure electrodes 23a and 23b and the second exposure electrodes 33a and 33b are formed to be connected to the lead electrode and the external terminal electrode. The print pattern lengths of the primary coil pattern 23 and the secondary coil pattern 33 are set to have a desired number of turns when the first green sheet 21 and the second green sheet 31 are wound in a predetermined square pillar shape. The turns ratio of the primary coil and the secondary coil can be obtained by adjusting the length of the primary coil pattern 23 and the length of the secondary coil pattern 33.
    The first green sheet 21 and the second green sheet 31 can be sintered at a low temperature and have a low permeability (hereinafter, referred to as a value of about 1 to 10) of MgO-Al 2 O 3 -SiO. A glass / ceramic material obtained by mixing a glass composed mainly of 2 and ceramics such as alumina, mullite, cordierite and the like is manufactured in the form of a sheet using a tape casting method. The conductive paste uses a metal such as Ag, Cu, Au, which has a low sheet resistance and is capable of co-sintering with the first and second green sheets 21 and 31. In particular, FIG. 2 illustrates a case in which a plurality of primary coil patterns 23 and secondary coil patterns 33 are printed, respectively, to form a plurality of multilayer ceramic transformers on a single green sheet.
    Referring to FIG. 3, the first green sheet 21 on which the primary coil pattern 23 is printed is fixed to the Ni-Cu-Zn type low-temperature sintering ferrite molded body 26 having a high permeability material and a square pillar shape. To form a square pillar. In addition, the first ceramic coil laminate 28 is formed by winding a ferrite green sheet 27 made of a Ni-Cu-Zn-based high-permeability material for low-temperature sintering. The external ferrite green sheet 27 is molded in a sheet state using a tape casting method.
    Next, the second green sheet 31 on which the secondary coil pattern 33 is printed is made of Ni-Cu-Zn having a high permeability (hereinafter, referred to as a relative permeability of about 50 to 1000) material and having a rectangular pillar shape. The low temperature sintering ferrite molded body 36 of the system is uniformly wound to form a square pillar. In addition, a second ceramic coil laminate 38 is formed by winding a ferrite green sheet 37 made of a Ni-Cu-Zn-based high-permeability material for low temperature sintering. The external ferrite green sheet 37 is molded in a sheet state using a tape casting method.
    As shown in FIG. 4, the first ceramic coil laminate 28 and the second ceramic coil laminate 38 made as described above are cut along the cutting lines 25a and 35a, respectively. 29) and the secondary coil stack 39 is formed. In Fig. 3, reference numerals 25 and 35 denote cutting grooves (cut lines).
    Referring to FIG. 4, a lower ferrite green sheet 41 having a high permeability having a first drawing electrode 43a and 43b connected to the first exposure electrodes 23a and 23b under the primary coil stack 29. ) And the upper ferrite green sheet 51 having the second lead electrodes 53a and 53b connected to the second exposure electrodes 33a and 33b on the secondary coil stack 39. .
    Referring to FIG. 5, the lower ferrite green sheet 41, the primary coil stack 29, the secondary coil stack 39 and the upper ferrite green sheet 51 are laminated, and then integrated by sintering by hot pressing. The laminated body 61 is formed. The sintering simultaneously performs a high permeability ferrite material portion, a low permeability ceramic material portion, and a conductive paste material portion at 850 to 900 ° C.
    Next, the first and second lead electrodes 43a and 43b and the second and second lead electrodes 53a and 53b of the primary coil stack 29 and the secondary coil stack 39 are formed outside the stack 61. The first external terminal electrodes 63a and 63b and the second external terminal electrodes 73a and 73b to be connected are printed side by side. Subsequently, the printed first external terminal electrodes 63a and 63b and the second external terminal electrodes 73a and 73b are sintered, nickel plated, and solder plated again to complete the surface mount multilayer ceramic transformer. do.
    6 and 7 illustrate a method of manufacturing a multilayer ceramic transformer according to a second exemplary embodiment of the present invention. 6 and 7, the same reference numerals as the first embodiment denote the same members.
    The multilayer ceramic transformer of the first embodiment of the present invention is made by printing a primary coil stack and a secondary coil stack on a first green sheet and a second green sheet, respectively. On the contrary, the multilayer ceramic transformer of the second embodiment of the present invention is the same except that the primary coil pattern and the secondary coil pattern are simultaneously printed on one green sheet 81.
    Specifically, the primary coil pattern 23 and the secondary coil pattern 33 having the first exposure electrodes 23a and 23b and the second exposure electrodes 33a and 33b are respectively formed on one green sheet 81. Print at the same time. Subsequently, the green sheet 81 is uniformly rolled on the Ni-Cu-Zn-based low-temperature sintering ferrite molded body 96 having a high permeability material and a rectangular columnar shape to form a rectangular columnar shape. In addition, a ceramic coil laminate 98 is formed by winding a ferrite green sheet 97 made of a Ni-Cu-Zn system having a high permeability material and for low temperature sintering. The external ferrite green sheet 97 is molded in a sheet state using a tape casting method. Next, when the ceramic coil laminate 98 is cut along the cutting line 95a, a coil laminate having a form in which the primary coil laminate 29 and the secondary coil laminate 39 of FIG. 4 are combined is formed. .
    Next, the coil laminate is laminated on the lower ferrite green sheet 41 having a high permeability as in the first embodiment, and the upper ferrite green sheet 51 is laminated thereon to form the laminate. Subsequently, as in the first embodiment, a sintered and external terminal electrode was formed to manufacture a multilayer ceramic transformer.
    8 is a cross-sectional view illustrating a multilayer ceramic transformer according to a first embodiment of the present invention.
    Specifically, the portion 101 forming the primary coil pattern 23 and the secondary coil pattern 33 is made of a glass-ceramic material, which is a low permeability material, and the other portion 103 is a ferrite material, which is a high permeability material. It is composed of all the united form. Since the portions having the coil patterns 23 and 33 are low permeability materials, the leakage magnetic flux between the coils is minimized so that most of the coil patterns 23 and 33 are transferred to the secondary coils without reducing the magnetic flux from the primary coil. In Fig. 8, reference numerals 63a, 63b, 73a, and 73b are external terminal electrodes shown for convenience.
    In the above-described embodiment of the present invention, the case in which the output of the secondary side is one has been described. However, when the exposed electrode connecting the secondary side coil to the outside is formed at various portions and the drawing electrodes are also connected and connected, the external terminal of the multilayer ceramic transformer is consequently formed. A plurality of electrodes are also formed to enable a multi-output multilayer ceramic transformer. Then, a predetermined circuit pattern is formed on the surface of the multilayer ceramic transformer and connected to an external terminal electrode, and then various electronic components are mounted thereon, whereby a hybrid component can be manufactured.
    In the multilayer ceramic transformer manufactured according to the present invention, since the portion forming the coil is made of a low permeability material, the leakage magnetic flux generated between each coil is minimized, and thus the energy is transmitted to the secondary coil without reducing the magnetic flux of the primary coil. The efficiency can be improved.
    In addition, since the coil is a magnetic transformer that is completely embedded inside the ferrite magnetic material, even when used as a high frequency switching transformer, the problem of radiation of electromagnetic noise to the outside due to leakage magnetic flux can be solved.
    In addition, since the most difficult via hole forming process and the process of aligning multiple layers in the manufacture of laminated ceramics increase reliability of the manufacturing process and facilitate the automation of the manufacturing process.
    权利要求:
    Claims (10)
    [1" claim-type="Currently amended] Printing a primary coil pattern and a secondary coil pattern having first and second exposed electrodes on both ends of the first green sheet and the second green sheet, respectively;
    Winding the first green sheet and the second green sheet on which the primary coil pattern and the secondary coil pattern are formed, respectively, on a ferrite molded body;
    Rolling up the ferrite green sheet on the outside of the first green sheet and the second green sheet wound on the ferrite molded body to form a first ceramic coil stack and a second ceramic coil stack;
    Cutting the first ceramic coil stack and the second ceramic coil stack to form a primary coil stack and a secondary coil stack;
    A lower ferrite green sheet having a first lead electrode connected to the first exposed electrode at a lower portion of the primary coil laminate, and a second lead electrode connected to the second exposed electrode at an upper portion of the secondary coil laminate. Preparing and stacking an upper ferrite green sheet having a thickness;
    Sintering the primary and secondary coil laminates and upper and lower ferrite green sheets to form laminates; And
    Forming a first external terminal electrode and a second external terminal electrode connected to the first lead electrode and the second lead electrode of the primary coil stack and the secondary coil stack, respectively, outside the stack; Method for producing a multilayer ceramic transformer, characterized in that made.
    [2" claim-type="Currently amended] The method of claim 1, wherein the primary coil pattern and the secondary coil pattern are formed of any one conductive paste selected from Ag, Cu, and Au.
    [3" claim-type="Currently amended] The method of claim 1, wherein the sintering of the primary and secondary coil laminates and the upper and lower ferrite green sheets is performed at 850 to 900 ℃.
    [4" claim-type="Currently amended] The method of claim 1, wherein the first green sheet and the second green sheet are formed by using a tape casting method of glass and ceramic materials.
    [5" claim-type="Currently amended] The method of claim 1, wherein the ferrite molded body is molded in a rectangular pillar shape, and the ferrite green sheet is molded in a sheet state by a tape casting method.
    [6" claim-type="Currently amended] Printing a primary coil pattern and a secondary coil pattern having a first exposed electrode and a second exposed electrode on both ends of the green sheet;
    Winding the green sheet on which the primary coil pattern and the secondary coil pattern are formed, on a ferrite molded body;
    Rolling up the ferrite green sheet on the outside of the green sheet rolled on the ferrite molded body to form a ceramic coil laminate;
    Cutting the ceramic coil stack to form a coil stack having a primary coil pattern and a secondary coil pattern;
    A lower ferrite green sheet having a first drawing electrode connected to a first exposure electrode and a lower ferrite green sheet having a second drawing electrode connected to the second exposure electrode, respectively, on the lower and upper portions of the coil stack; step;
    Stacking and sintering the coil stack and upper and lower ferrite green sheets to form a stack; And
    Forming a first external terminal electrode and a second external terminal electrode connected to the first lead electrode and the second lead electrode of the coil laminate outside the laminate. Manufacturing method.
    [7" claim-type="Currently amended] The method of claim 6, wherein the primary coil pattern and the secondary coil pattern are formed of any one conductive paste selected from Ag, Cu, and Au.
    [8" claim-type="Currently amended] The method of claim 6, wherein the coil laminate and the upper and lower ferrite green sheets are sintered at 850 to 900 ° C. 8.
    [9" claim-type="Currently amended] The method of manufacturing a multilayer ceramic transformer according to claim 6, wherein the green sheet is formed of a glass and a ceramic material by a tape casting method.
    [10" claim-type="Currently amended] The method of manufacturing a multilayer ceramic transformer according to claim 6, wherein the ferrite molded body is formed in a rectangular pillar shape, and the ferrite green sheet is molded in a sheet state by a tape casting method.
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    同族专利:
    公开号 | 公开日
    KR100243360B1|2000-02-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-10-29|Application filed by 김춘호, 전자부품연구원
    1997-10-29|Priority to KR1019970056027A
    1999-05-15|Publication of KR19990034422A
    2000-02-01|Application granted
    2000-02-01|Publication of KR100243360B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970056027A|KR100243360B1|1997-10-29|1997-10-29|Manufacturing method of laminating ceramic transformer|
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