Patent Publication Number: US-2012032766-A1

Title: Transformer for Communication Network

Description:
BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The invention relates to transformers, particularly to transformers used in communication network. 
     2. Related Art 
     A transformer for communication network is a magnetic component between an interface of a terminal device and an Ethernet transceiver. These transformers have two kinds. The first kind is to be installed in RJ45 connectors, the second kind is to be soldered on circuit boards. 
     A typical transformer for being mounted on a circuit board is illustrated in  FIGS. 1-3 . Transformer windings  10  electrically connecting to filter windings  11  are put in an insulative cover  12 . And the wires of the windings  10 ,  11  are connected with pins  13  of the insulative cover  12 . The transformer windings  10  are installed in the insulative cover  12  after they have been connected with the filter windings  11 . As a result, the connections between the windings  10 ,  11  and the pins  13  tend to be broken. Further, the insulative cover  12  does not a structure for supporting the windings  10 ,  11 , so the connections between the windings  10 ,  11  and the pins  13  appear messy and are hard to be debugged. On the other hand, if a system or device requires larger-sized windings, the insulative cover  12  will be a limitation because it will occupy a larger area of a circuit board and is disadvantageous to the layout of circuit board. 
     SUMMARY OF THE INVENTION 
     One object of the invention is to provide a transformer for communication network, which can vary the amount of transformer units depending on practical requirements and is advantageous to the layout of circuit board. 
     Another object of the invention is to provide a transformer for communication network, which can prevent the connections between the windings and pins from being broken. 
     Still another object of the invention is to provide a transformer for communication network, which can protect the windings. 
     To accomplish the above objects, the invention includes transformer windings, filter windings, pins, first bases, a second base and an insulative cover. The transformer windings and filter windings are mounted in each of the first bases and electrically connect to pins. The first bases with the transformer windings and the filter windings are mounted are mounted on the second base by inserting the pins into the second base. The insulative cover cloaks all of the components with exposing parts of the pins 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a circuit diagram of the network transformer; 
         FIG. 2  is a schematic view of a transformer winding and a filter winding; 
         FIG. 3  is a perspective view of a conventional network transformer; 
         FIG. 4  is an exploded view of the transformer unit of the invention; 
         FIG. 5  is an assembled view of the transformer unit of the invention; 
         FIG. 6  is an exploded view of the transformer component of the invention; 
         FIG. 7  is an assembled view of the transformer component of the invention; and 
         FIG. 8  is a schematic view of the transformer component in association with a circuit board of an external device. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Please refer to  FIGS. 4-6 . The transformer of the invention includes transformer windings  20 , filter windings  21 , pins  3 , first bases  4 , a second base  5  and an insulative cover  6 . 
     Each of the pins  3  has a connection portion  30  and a contact portion  31 . The connection portions  30  are connected with wires  200 ,  210  of the transformer windings  20  or filter windings  21 . The contact portions  31  are used for connecting with an external device. 
     The first bases  4  are made of an insulative material. Each of the first bases  4  has a body  40  with a space  41 . The body  40  is provided with a plurality of positioning holes  401  separately corresponding to the pins  3 , and the positioning holes  401  are separately passed through by the contact portions  31  of the pins  3 . The space  41  accommodates the transformer windings  20  and the filter windings  21 . The body  40  is formed with a positioning body  43  towards the second base  5 . 
     The second base  5  is mounted by all of the first bases  4  and has a plurality of through holes  50  separately corresponding to the positioning holes  401  and a positioning trough  51  for being embedded by the positioning body  43 . 
     The insulative cover  6  cloaks all of the above components with exposing a part of the contact portions of the pins  3 . 
       FIGS. 7 and 8  illustrate the assembling process of the invention. First, the pins  3  are inserted into the positioning holes  401  with exposing the connection portions  30  and contact portions  31 . The connection portions  30  and the contact portions  31  may connect with the transformer windings  20  or the filter windings  21  and a circuit board  7  of an external device, respectively. Then, the transformer windings  20  and filter windings  21  are put in the space  41  of the first base  4 . Next, every first base  4  which has assembled with the windings  20 ,  21  is mounted on the second base  5  by inserting the pins  3  into the through holes  50  with exposing the contact portions  31 . That is, all the first bases  4  are gathered in a row. Finally, the insulative cover  6  is fastened to cloak all the components with protruding the contact portions  31 . Thus, every the first base  4  including the transformer windings  20  and filter windings  21  is defined as an independent transformer unit A. Various amount of the transformer unit A may be gathered on the second base  5  depending on practical requirement. And the insulative cover  6  may package a plurality of transformer units A to be a single transformer component B. That is, a transformer component B including a plurality of the transformer windings  20  and filter windings  21  may be easily assembled. This can improve the yield rate. 
     Please refer back to  FIGS. 4 and 5 . Two opposite sides of the body  40  of the first base  4  are separately formed with two side walls  42 . The side walls  42  can prevent the transformer windings  20  and filter windings  21  from escaping out of the body  40 . The side wall  42  is split by a plurality of gaps  420  for allowing the connection portions  30  to pass through. This is advantageous to connecting the wires  200 ,  201  because the wires  200 ,  201  may be positioned in respective gaps  420 . 
     It will be appreciated by persons skilled in the art that the above embodiment has been described by way of example only and not in any limitative sense, and that various alterations and modifications are possible without departure from the scope of the invention as defined by the appended claims.