Abstract:
The embodiment relates to a transformer. A transformer according to an aspect includes: a first coil assembly including a first core, a first bobbin coupled to the first core, and a first coil provided on the first bobbin; and a second coil assembly coupled to the first coil assembly, and including a second core, a second bobbin coupled to the second core, and a second coil provided on the second bobbin.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    Pursuant to 35 U.S.C. §119(a), this application claims the benefit of earlier date and right of priority to Korean Patent Application No. 10-2012-0102458, filed on Sep. 14, 2012, the contents of which is incorporated by reference herein in its entirety. 
       BACKGROUND 
       [0002]    The present disclosure relates to a transformer. 
         [0003]    In general, a transformer is a device for changing AC voltage or current by using an electromagnetic induction phenomenon. 
         [0004]    The transformer may include a bobbin for winding a primary coil and a secondary coil, and a plurality of cores coupled with the bobbin. 
         [0005]    Since a work of winding the primary coil and the secondary coil on the bobbin is required in order to manufacture such a conventional transformer, a working hours increases and the work becomes complicated. 
         [0006]    Further, the transformer using the primary coil and the secondary coil may be generally used when low current is applied because heat emission increases, but heat dissipation is difficult when high current is applied. 
       SUMMARY 
       [0007]    Embodiments relate to a transformer. 
         [0008]    In one embodiment, a transformer includes: a first coil assembly including a first core, a first bobbin coupled to the first core, and a first coil provided on the first bobbin; and a second coil assembly coupled to the first coil assembly, and including a second core, a second bobbin coupled to the second core, and a second coil provided on the second bobbin. 
         [0009]    In another embodiment, a transformer includes: a first core, a first bobbin seated on the first core, a first plate type coil seated on the first bobbin, an intermediate plate seated on the first plate type coil, a second plate type coil seated on the intermediate plate, a second bobbin seated on the second plate type coil, and a second core seated on the second bobbin. 
         [0010]    In still another embodiment, a transformer includes a first core, a first bobbin seated on the first core, a first coil connected to the first bobbin, a second coil spaced apart from the first coil, a second bobbin connected to the second coil, and a second core seated on the second bobbin, and a cutout portion for locating at least one of the first coil and the second coil is formed in at least one of the first bobbin and the second bobbin. 
         [0011]    The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]      FIG. 1  is a perspective view of a transformer according to an embodiment. 
           [0013]      FIG. 2  is a plan view of the transformer according to the embodiment. 
           [0014]      FIG. 3  is an exploded perspective view of the transformer according to the embodiment. 
           [0015]      FIG. 4  is a lower perspective view of the lower bobbin according to the embodiment of the present invention. 
           [0016]      FIG. 5  is an upper perspective view of the lower bobbin according to the embodiment of the present invention. 
           [0017]      FIG. 6  is a cross-sectional view taken along line A-A of  FIG. 4 . 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0018]    Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings in the present invention. When reference numerals refer to components of each drawing, it is noted that although the same components are illustrated in different drawings, the same components are referred to by the same reference numerals as possible. In describing the embodiments of the present invention, when it is determined that the detailed description of the known art related to the present invention may obscure the gist of the present invention, the detailed description thereof will be omitted. 
         [0019]    Further, in describing components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), and the like may be used. The terms are used to just distinguish the components from other components and properties, or a sequence or an order of the corresponding components is not limited by the terms. When it is disclosed that any component is “connected”, “coupled”, or “linked” to other components, it should be understood that the component may be directly connected or linked to other components, but another component may be “connected”, “coupled”, or “linked” between the respective components. 
         [0020]      FIG. 1  is a perspective view of a transformer according to an embodiment.  FIG. 2  is a plan view of the transformer according to the embodiment.  FIG. 3  is an exploded perspective view of the transformer according to the embodiment. 
         [0021]    Referring to  FIGS. 1 to 3 , a transformer  1  according to an embodiment may include bobbins  11  and  13 , coils  10  and  12 , and cores  14  and  15 . 
         [0022]    In detail, the coils  10  and  12  may include a first plate type coil  10  and a second plate type coil  12 . Each of the plate type coils  10  and  12  may include a coil part  101  and a plurality of terminal parts  102  provided at both ends of the coil part  101 . 
         [0023]    The coil part  101  may have a shape such as “U” or “C” as one example, but the shape of the coil part  101  is not limited thereto. One or more holes for connecting other electric components may be formed at one or more of the plurality of terminal parts  102 . 
         [0024]    At least a part of any one of the terminal parts of the first plate type coil  10  may overlap with any one of the terminal parts of the second plate type coil  12  in a vertical direction (a direction in which the first plate type coil and the second plate type coil are arranged). On the contrary, the other one of the terminal parts s of the first plate type coil  10  and the other one of the terminal parts of the second plate type coil  12  may nonoverlap with each other in the vertical direction (the direction in which the first plate type coil and the second plate type coil are arranged). 
         [0025]    The bobbins  11  and  13  may include a lower bobbin  11  (alternatively, a first bobbin) and an upper bobbin  13  (alternatively, a second bobbin). 
         [0026]    The lower bobbin  11  and the upper bobbin  13  have the same shape and may be disposed to be symmetric to each other. Of course, the lower bobbin  11  and the upper bobbin  13  may have different shapes. 
         [0027]    The first plate type coil  10  may be seated on the lower bobbin  11 . The upper bobbin  13  may be seated on the second plate type coil  12 . That is, each of the bobbins  11  and  13  serves to fix the location of each of the plate type coils  10  and  12 . 
         [0028]    In this case, the first plate type coil  10  may be a primary coil and the second plate type coil  16  may be a secondary coil. As another example, the first plate type coil  10  may be the secondary coil and the second plate type coil  16  may be the primary coil. 
         [0029]    An intermediate plate  16  may be provided between the first plate type coil  10  and the second plate type coil  12 . The intermediate plate  16  is connected to the lower bobbin  11  and the upper bobbin  13  to fix relative locations of the lower bobbin  11  and the upper bobbin  13 . Moreover, the intermediate plate  16  enables electrically insulating the first plate type coil  10  and the second plate type coil  12  from each other. That is, the intermediate plate  16  separates the first plate type coil  10  and the second plate type coil  12  from each other. 
         [0030]    An opening portion  161  may be formed at the center of the intermediate plate  16  and a plurality of coupling portions  162  for coupling with each of the bobbins  11  and  13  may be formed at a location adjacent to the opening portion  161 . That is, one or more coupling portions  162  may be projected onto the top and the bottom of the intermediate plate  16 , respectively. 
         [0031]    The coupling portion  162  may be inserted into the bobbins  11  and  13  as one example. When the coupling portion  162  is inserted into the bobbins  11  and  13 , the intermediate plate  16  may be prevented from being rotated between the first plate type coil  10  and the second plate type coil  16 . As another example, coupling grooves are formed on the top and the bottom of the intermediate plate  16 , respectively and the coupling portion inserted into the coupling groove may be formed in each of the bobbins  11  and  13 . 
         [0032]    The cores  14  and  15  may include a lower core  14  (alternatively, a first core) and an upper core  15  (alternatively, a second core). The lower core  14  and the upper core  15  may have the same shape. Therefore, hereinafter, only a structure of the lower core  14  will be described and it will be disclosed that the description of the lower core is similarly applied to even the upper core  15 . 
         [0033]    The lower core  14  may include a seating portion on which the lower bobbin  11  is seated, an insertion portion inserted into the lower bobbin  11  which is seated on the seating portion  141 , and a plurality of side covers  143  projected on both sides of the seating portion  141  and covering both sides of the lower bobbin  11  seated on the seating portion  141 . 
         [0034]    The insertion portion  142  may have, for example, a cylindrical shape in order to be easily inserted into the lower bobbin  11 , but may have a shape different therefrom. 
         [0035]    The side cover  143  may have a round surface having the same curvature as a circumferential surface of the lower bobbin  11 . The side cover  143  may contact the lower bobbin  11  or be spaced apart from the lower bobbin  11  by a predetermined gap. 
         [0036]      FIG. 4  is a lower perspective view of the lower bobbin according to the embodiment of the present invention.  FIG. 5  is an upper perspective view of the lower bobbin according to the embodiment of the present invention.  FIG. 6  is a cross-sectional view taken along line A-A of  FIG. 4 . 
         [0037]    Hereinafter, a structure of the lower bobbin will be described and it will be disclosed that the description of the lower bobbin may be just applied to even the upper bobbin. However, since the upper bobbin and the lower bobbin are disposed to be line-symmetric or point-symmetric to each other, each component of the lower bobbin may be disposed in opposition to that of the upper bobbin. 
         [0038]    Referring to  FIGS. 4 to 6 , the lower bobbin  11  may include a first plate  111  seated on the lower core  14 , a second plate  112  spaced apart from the first plate  111 , on which the first plate type coil  10  is seated, and a connection portion  113  connecting the first plate  111  and the second plate  112 . 
         [0039]    The first plate  111  and the second plate  112  may have a disk shape as one example. In addition, a hole (reference numeral is not displayed) to be inserted with the insertion portion  142  of the lower core  14  may be formed at the centers of the first plate  111  and the second plate  112 . 
         [0040]    The connection portion  113  may have a cylindrical shape having a hollow  114  as one example. Therefore, the insertion portion  142  of the lower core  14  may penetrate the hole of each plate  111  or  112  and the hollow  114 . The first plate  111 , the second plate  112 , and the connection portion  113  may be integrally formed or separately formed to be coupled to each other. 
         [0041]    The transformer  1  of the embodiment may adopt the plate type coils  10  and  12  or may adopt a wire-shaped coil without using the plate type coils  10  and  12 . When the wire shaped coil is adopted, the wire-shaped coil may be wound on the connection portion  113  and as the connection portion  113  has the cylindrical shape, the wire-shaped coil may be easily wound on the connection portion  113 . That is, the wire-shaped coil may be wound on the connection portion of the lower bobbin and the wire-shaped coil may be wound on the connection portion of the upper bobbin. 
         [0042]    In the embodiment, the coil wound on the lower bobbin  11  may be the primary coil or the secondary coil. In the embodiment, the coil wound on the lower bobbin  13  may be the primary coil or the secondary coil. 
         [0043]    Therefore, in the specification, a coil which may be seated or wound on the lower bobbin will be referred to as a first coil and a coil which may be seated or wound on the upper bobbin will be referred to as a second coil. That is, the lower bobbin serves to support the first coil and the upper bobbin serves to support the second coil. 
         [0044]    A plurality of antirotation ribs  115  for preventing rotation of the lower bobbin  11  while the plurality of antirotation ribs  115  is seated on the lower core  14  may be formed on the first plate  111 . The plurality of antirotation ribs  115  is disposed to be spaced apart from each other and a separation distance is the same as a width of the seating portion  141  of the lower core  14 . In addition, a horizontal cross-section of the seating portion  141  of the lower core has a non-circular shape. 
         [0045]    Therefore, when the first plate  111  is seated on the seating portion  141  of the lower core  14 , the plurality of antirotation ribs  115  contacts both sides of the seating portion  141  of the lower core  14  to prevent rotation of the lower bobbin  11 . That is, the seating portion of the lower core  14  is positioned between the plurality of antirotation ribs  115 . 
         [0046]    A cutout portion  116  for locating the wire-shaped coil may be formed on the first plate  111  so as to fix and connect the wire-shaped coil when the wire-shaped coil is wound on the lower bobbin  111 . 
         [0047]    The second plate  112  may include a guide portion  117  guiding a seating location of the first plate type coil  10 . The guide portion  117  may prevent rotation of the first plate type coil  10 . 
         [0048]    A plurality of ribs  118  for forming an insertion groove  119  inserted with the coupling portion  162  of the intermediate plate  16  may be formed in the guide portion  117 . 
         [0049]    At least a part of the guide portion  117  may extend in a radial direction at the center of the second plate  112 . 
         [0050]    The plurality of ribs  118  is disposed to be separated from each other and the insertion groove  119  may be formed between the plurality of ribs  118 . As another example, the insertion groove  119  may be formed at the rib  118 . 
         [0051]    Alternatively, the rib  118  is not formed in the guide portion  117  but may be projected directly on the second plate  112  at a location separated from the guide portion  117 . 
         [0052]    Hereinafter, a method of assembling the transformer of the present invention will be described. 
         [0053]    In the specification, the lower core, the lower bobbin, and the first plate type coil will be referred to as a first coil assembly and the upper core, the lower bobbin, and the second plate type coil will be referred to as a second coil assembly. 
         [0054]    First, the first coil assembly and the second coil assembly are completed. 
         [0055]    In order to complete the first coil assembly, the first plate type coil  10  is seated on the second plate  112  of the lower bobbin  11 . In addition, the lower bobbin  11  is seated on (coupled to) the lower core  14 . 
         [0056]    In order to complete the second coil assembly, the second plate type coil  12  is seated on the second plate of the lower bobbin  13 . In addition, the upper bobbin  13  is seated on (coupled to) the upper core  15 . 
         [0057]    Next, the first coil assembly and the second coil assembly are coupled to each other while the intermediate plate  16  is positioned between the first coil assembly and the second coil assembly. 
         [0058]    In this case, the first coil assembly and the second coil assembly may be coupled to each other by coupling the upper core and the lower core with a fastening means as one example. 
         [0059]    In the present invention, a manufacturing sequence of the transformer is not limited to the aforementioned sequence and the lower core to the upper core may be sequentially assembled or assembled in an opposite sequence thereto. 
         [0060]    According to the proposed invention, since excellent heat emission performance may be maintained even when high current is applied in the case where a plate type coil is used as a type of the coil, the transformer may be stably operated. 
         [0061]    Further, as the guide portion for guiding the seating location of the plate type coil is provided in the bobbin, misassembly of the plate type coil is prevented. 
         [0062]    In addition, a structure in which the plate type coil may be seated on the bobbin is formed and a structure in which the wire-shaped coil may be wound is provided, and as a result, various types of transformers may be manufactured without changing the structure. 
         [0063]    In the present invention, it has been described that the plate coil or the wire-shaped coil is used as the primary coil and the secondary coil in the transformer, but contrary to this, any one of the primary coil and the secondary coil is used as the plate type coil and the other one may be used as the wire-shaped coil. However, when any one is the wire-shaped coil, the intermediate plate may be omitted. 
         [0064]    Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.