Patent Publication Number: US-2022216000-A1

Title: Magnetic module and electrical connector including the magnetic module

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This patent application relates to U.S. patent application Ser. No. 17/476,366, filed on Sep. 15, 2021, entitled “MAGNETIC MODULE AND ELECTRICAL CONNECTOR INCLUDING THE MAGNETIC MODULE” and U.S. patent application filed on even day herewith, entitled “MAGNETIC MODULE AND METHOD OF MAKING THE SAME AND ELECTRICAL CONNECTOR INCLUDING THE MAGNETIC MODULE,” which are assigned to the same assignee as this application. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to a magnetic module and an electrical connector including the magnetic module, and more particularly to the distribution of the coil enameled wire of the magnetic module. 
     2. Description of Related Arts 
     China Patent No. 102832019 discloses a magnetic module including a magnetic core, a primary coil and a secondary coil wound on the magnetic core, each input end and output end of the primary coil and the secondary coil has two wire, and the resistance of each input end and output end is relatively large, which cannot guarantee the effective transmission of high-frequency signal transmission. 
     SUMMARY OF THE INVENTION 
     A main object of the present invention is to provide a magnetic module suitable for high-frequency signal transmission. 
     To achieve the above-mentioned object, a magnetic module comprises: a magnetic core; and a plurality of enameled wires wound on the magnetic core, the enameled wire being wound on the magnetic core to form a primary coil and a secondary coil, the primary coil forming a primary input end, a primary output end, and a primary center tap, the secondary coil forming a secondary input end, a secondary output end, and a secondary center tap, wherein one of the primary coil and the secondary coil includes four groups of enameled wires, and the other includes one group of enameled wires. 
     To achieve the above-mentioned object, an electrical connector comprises a magnetic module, the magnetic module comprising: a magnetic core; and a plurality of enameled wires wound on the magnetic core, the enameled wire being wound on the magnetic core to form a primary coil and a secondary coil, the primary coil forming a primary input end, a primary output end, and a primary center tap, the secondary coil forming a secondary input end, a secondary output end, and a secondary center tap, wherein one of the primary coil and the secondary coil includes four groups of enameled wires, and the other includes one group of enameled wires, and the electrical connector can support 25 Gbps. 
     Compared to prior art, one of the primary coil and the secondary coil includes four groups of enameled wires, and the other includes one group of enameled wires, through reasonable distribution of enameled wires, to ensure the effective transmission of high-frequency signals. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         FIG. 1  is a schematic diagram of magnetic module in accordance with the present invention and common mode choke coil connected with it; 
         FIG. 2  is a circuit schematic of the magnetic module and the common mode choke coil connected to it in  FIG. 1 ; 
         FIG. 3  is a schematic diagram of the wire ends spreading out after the magnetic module is wound in  FIG. 1 ; and 
         FIG. 4  is a perspective view of an electrical connector including the magnetic module in  FIG. 3 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1-4 , a magnetic module  100  in accordance with the present invention is shown. The magnetic module  100  is actually a transformer. The magnetic module  100  includes a toroid or magnetic core  1  and a plurality of enameled wires wound on the magnetic core  1 . The enameled wire is wound on the magnetic core  1  to form a primary coil  2  and a secondary coil  3  of the magnetic module  100 . 
     One of the primary coil  2  and the secondary coil  3  includes four groups of enameled wires, and the other includes one group of enameled wires. Specifically, in this embodiment, the primary coil  2  has four groups of enameled wires, and the secondary coil  3  has one group of enameled wires. The magnetic module can support 6.25 Gbps signal transmission. The primary coil  2  includes a primary center tap  101 , and the secondary coil  3  includes a secondary center tap  102 . 
     The magnetic core  1  has a circular ring shape with a central through hole or an oval shape with two through holes. Specifically, in this embodiment, the magnetic core  1  is a toroidal magnetic core  1  provided with a central through hole  11 . The primary coil  2  includes a first group of enameled wires  21  and a second group of enameled wires  22 . The first group of enameled wires  21  and the second group of enameled wires  22  respectively form the primary input end  211  and the primary output end  221  of the primary coil  2 , and a primary center tap  101  is formed between the primary input end  211  and the primary output end  221 . The secondary coil  3  includes a third group of enameled wires  33  and a fourth group of enameled wires  34 . The third group of enameled wires  33  and the fourth group of enameled wires  34  respectively form the secondary input end  331  and the secondary output end  341  of the secondary coil  3 , and form the secondary center tap  102 . Each of the first group of enameled wires  21  and the second group of enameled wires  22  has four enameled wires, and each of the third group of enameled wires  33  and the fourth group of enameled wires  34  has only one enameled wire. The diameter of each of the first group of enameled wires  21 , the diameter of each of the second group of enameled wires  22 , the diameter of each of the third group of enameled wires  33 , and the diameter of each of the fourth group of enameled wires  34  are the same. The respective parts of the first group of enameled wires  21 , the second group of enameled wires  22 , the third group of enameled wires  33 , and the fourth group of enameled wires  34  wound around the magnetic core  1  are twisted together, and are wound around the magnetic core  1  in a manner that penetrates the central through hole  11 , and expose the ends of each group of enameled wires. 
     Each enameled wire has a first thread and a second thread. The first group of enameled wire  21  is natural. Each enameled wire in the first group of enameled wires  21  comprises a first thread N and a second thread n. The second group of enameled wire  22  is blue. Each enameled wire in the second group of enameled wires  22  comprises a first thread B and a second thread b. The third group of enameled wire  33  is red. Each enameled wire in the third group of enameled wires  33  comprises a first thread R and a second thread r. The fourth group of enameled wire  34  is green. Each enameled wire in the fourth group of enameled wires  34  comprises a first thread G and a second thread g. The color of the enameled wire is just for easy distinction, and other colors can also be used instead. 
     The first thread NNNN of the four enameled wires of the first group of enameled wires  21  collectively serves as the primary input end  211  of the primary coil  2  of the transformer. The second thread nnnn of the first group of enameled wires  21  and the first thread BBBB of the second group of enameled wires  22  together form the first center tap  101 . The second thread bbbb of the four enameled wires of the second group of enameled wires  22  are collectively used as the primary output end  221  of the primary coil  2  of the transformer. The first thread R of the enameled wire of the third group of enameled wires  33  is used as the secondary input end  331  of the transformer secondary coil  3 . The second thread g of the fourth group of enameled wire  34  is the secondary output end  341  of the transformer secondary coil  3 . The second thread r of the third group of enameled wires  33  and the first thread G of the fourth group of enameled wires  34  together form the second center tap  102 . The first center tap  101  is twisted into one bundle, and the second center tap  102  is twisted into another bundle. The first center tap  101  extends to be electrically connected to external components. The tail end of the second center tap  102  is immersed in tin and short-circuited. The distance between the part of the immersed in tin of the secondary center tap  102  and the magnetic core is not more than 1.1 mm. 
     Referring to  FIG. 4 , an electrical connector  600  in accordance with the present invention includes a housing  601 , an insulating body  602  housed in the housing  601 , and a magnetic module  100  housed in the housing  601 . The electrical connector  600  also includes a common mode choke  200 . The common mode choke coil  200  includes common mode core  201 . Add a natural enameled wire  40 , which includes the first thread N′ and the second thread n′. Twist the natural wire  40  with the third group of enameled wires  33  and the fourth group of enameled wires  34  and wind it around the common mode core  201  to form windings RgN′ and rGn′. The electrical connector  600  includes four magnetic modules  100 , and the electrical connector  600  can support 25 Gbps signal transmission. 
     In the present invention, one of the primary coil and the secondary coil includes four groups of enameled wires, and the other includes one group of enameled wires, so that the coil with four groups of enameled wires has a lower resistance, by reasonably distributing the enameled wire, in order to achieve the purpose of transmitting high-frequency signals.