Abstract:
A circuit board assembly includes a circuit board, at least one metal sheet, at least one bus and at least one fixed member. The circuit board has at least one electrical connecting area. The metal sheet is adapted to solder to the electrical connecting area and has at least one metal sheet hole. The bus has a connecting portion. The connecting portion is corresponding to the metal sheet. The bus has at least one fixed screwing hole. The fixed screwing hole is corresponding to the metal sheet hole. The circuit board and the bus is locked by the fixed member.

Description:
BACKGROUND OF INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a circuit board assembly, and more particularly to a circuit board assembly having a bus, a circuit board, and a metal sheet, wherein the bus is electrically connected to the circuit board by the metal sheet. 
         [0003]    2. Description of the Prior Art 
         [0004]    In general, a circuit board assembly used to couple the power supply is a necessary component in a integral electromechanical system, and the current circuit board assembly has at least one port to be plug by the bus of the power supply. However, in the above design, the tightness of the contacting status is insufficiently, and the conducting capacity is finite. Especially, when the design is applied in server or storage device, a large electricity supply is need and then more problems will be generated. 
         [0005]    Referring to  FIG. 1 ,  FIG. 1  is a three-dimensional schematic drawing illustrating the circuit board assembly in prior art. As shown in  FIG. 1 , a circuit board assembly PA 100  includes a circuit board PA 1  and two buses PA 2  ( FIG. 1  just shows one), wherein two plugging ports PA 12  ( FIG. 1  just shows one) are disposed on the circuit board PA 1 . The two buses PA 2  are plugged into the two plugging ports PA 12  respectively for connecting to the circuit of the circuit board PA 1  electrically. 
         [0006]    From above, because the current circuit board PA 1  is just configured with at least one plugging port PA 12  to be plugged for the bus PA 2 , thus the contact between the bus PA 2  and the plugging port PA 12  just can be via the metal elastic-element configured inside of the plugging port PA 12 . Therefore, when the metal elastic-element being in a status of elastic fatigue, the poor contact is occurred easily. 
       SUMMARY OF THE INVENTION 
       [0007]    To sum up, the poor contact is occurred frequently to cause damage and poor efficacy of power transmission when the plugging port is disposed on the circuit board to be plugged for the bus directly in the current circuit board assembly; accordingly, a circuit board assembly is provided, which is soldered on circuit board via the metal sheet, and then the bus is locked on the circuit board and metal sheet. Therefore, the bus can be contacted tightly and electrically connected to the metal sheet of the circuit board by the way of locking. 
         [0008]    In order to solve the problems of prior art, the present invent provides a circuit board assembly, which includes a circuit board, at least one metal sheet, at least one bus, and at least one fixed member. The circuit board has at least one electrical connecting area; the metal sheet is adapted to solder to the electrical connecting area and has at least one metal sheet hole; the bus has a connecting portion, the connecting portion is corresponding to the metal sheet, and the bus has at least one fixed screwing hole, the fixed screwing hole is corresponding to the metal sheet hole; the metal sheet and the bus are locked by the fixed member via the metal sheet hole and the fixed screwing hole for making a electrical connection between the metal sheet and the bus. 
         [0009]    According to an embodiment of the present invention, the bus is locked on the circuit board by the fixed member with a rotational torque for reducing a impedance value between the bus and the circuit board, a range of the rotational torque is between 20-40 kgf·cm. 
         [0010]    According to an embodiment of the present invention, when the rotational torque increases by degrees in the range of the rotational torque, the impedance value decreases by degrees relatively. 
         [0011]    According to an embodiment of the present invention, the circuit board has at least one circuit board locking hole corresponding to the metal sheet holes, the metal sheet and the bus are locked on the circuit board by the fixed member via the circuit board locking hole. 
         [0012]    According to an embodiment of the present invention, the circuit board further has at least one positioning hole, the positioning hole is adjacent to the electrical connecting area, and the metal sheet has at least one positioning portion, the positioning portion is wedged in the positioning hole. 
         [0013]    According to an embodiment of the present invention, there are plural positioning holes and positioning portions, the positioning holes are disposed around the electrical connecting area symmetrically, the positioning portions are wedged in the positioning holes correspondingly. 
         [0014]    According to an embodiment of the present invention, the metal sheet is copper sheet. 
         [0015]    According to an embodiment of the present invention, the bus is copper piece. 
         [0016]    According to an embodiment of the present invention, the bus further includes a bus body, the connecting portion is extended from the bus body integrally by the way of bending. 
         [0017]    According to an embodiment of the present invention, the extending direction of the connecting portion is vertical to the extending direction of the bus body. 
         [0018]    As described above, compared to the circuit board assembly of prior art with plugging port for plugging by the bus directly, the present invent applies the metal sheet to electrically connect with the circuit board and the bus. Thus, the present invent can make the bus electrically connect to circuit board effectively, and increases the stability of the electrical connection between the bus and the circuit board. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    The present invention will now be specified with reference to its preferred embodiment illustrated in the drawings, in which: 
           [0020]      FIG. 1  is a three-dimensional schematic drawing illustrating the circuit board assembly in prior art; 
           [0021]      FIG. 2  is a three-dimensional schematic drawing illustrating the circuit board assembly according to one preferred embodiment of the present invention; 
           [0022]      FIG. 3  is a three-dimensional schematic drawing in another view illustrating the circuit board assembly according to one preferred embodiment of the present invention; 
           [0023]      FIG. 4  is a exploded three-dimensional schematic drawing illustrating the circuit board assembly according to one preferred embodiment of the present invention; 
           [0024]      FIG. 5  is a exploded three-dimensional schematic drawing in another view illustrating the circuit board assembly according to one preferred embodiment of the present invention; 
           [0025]      FIG. 6  is a three-dimensional schematic drawing illustrating the metal sheet is soldered to the circuit board according to one preferred embodiment of the present invention; 
           [0026]      FIG. 7  is a three-dimensional schematic drawing illustrating the bus is disposed in the metal sheet and is fixed by the fixed member according to one preferred embodiment of the present invention; and 
           [0027]      FIG. 8  is a three-dimensional schematic drawing illustrating the circuit board assembly is applied in the electronic device according to one preferred embodiment of the present invention. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0028]    The invention disclosed herein is directed to a historical work parameter. In the following description, numerous details are set forth in order to provide a thorough understanding of the present invention. It will be appreciated by one skilled in the art that variations of these specific details are possible while still achieving the results of the present invention. In other instance, well-known components are not described in detail in order not to unnecessarily obscure the present invention. 
         [0029]    Referring to  FIG. 2  to  FIG. 5 ,  FIG. 2  is a three-dimensional schematic drawing illustrating the circuit board assembly according to one preferred embodiment of the present invention;  FIG. 3  is a three-dimensional schematic drawing in another view illustrating the circuit board assembly according to one preferred embodiment of the present invention;  FIG. 4  is a exploded three-dimensional schematic drawing illustrating the circuit board assembly according to one preferred embodiment of the present invention;  FIG. 5  is a exploded three-dimensional schematic drawing in another view illustrating the circuit board assembly according to one preferred embodiment of the present invention. 
         [0030]    As shown in  FIG. 2 - FIG. 5 , a circuit board assembly  100  includes a circuit board  1 , two metal sheets  2 ,  3 , two buses  4 ,  5 , and eight fixed members  6  ( FIG. 2 - FIG. 5  just shows one). 
         [0031]    The circuit board  1  is extended along a first extending direction L 1 , and has a bus disposing surface  11  and a fixed member locking surface  12  disposed opposite the bus disposing surface  11 . The bus disposing surface  11  has two electrical connecting areas  111  and  112 . The electrical connecting area  111  is configured with four circuit board locking holes  1111  ( FIG. 2 - FIG. 5  just shows one), and the electrical connecting area  112  is configured with four circuit board locking holes  1121  ( FIG. 2 - FIG. 5  just shows one). In addition, the bus disposing surface  11  is further configured with two positioning holes  113  ( FIG. 2 - FIG. 5  just shows one) and two positioning holes  114  ( FIG. 2 - FIG. 5  just shows one). 
         [0032]    The two positioning holes  113  are adjacent to the electrical connecting area  111  and disposed in two sides of the electrical connecting area  111  symmetrically. The two positioning holes  114  are adjacent to the electrical connecting area  1121  and disposed in two sides of the electrical connecting area  112  symmetrically. 
         [0033]    The metal sheet  2  is soldered to the electrical connecting area  111 , and is configured with four metal sheet holes  21  ( FIG. 2 - FIG. 5  just shows one), and metal sheet  2  further has two positioning portions  22  ( FIG. 2 - FIG. 5  just shows one), wherein the two positioning portions  22  are wedged to the two positioning holes  113  correspondingly. 
         [0034]    The metal sheet  3  is soldered to the electrical connecting area  112 , and is configured with four metal sheet holes  31  ( FIG. 2 - FIG. 5  just shows one), and the metal sheet  3  further has two positioning portions  32  ( FIG. 2 - FIG. 5  just shows one). The two positioning portions  32  are wedged to the two positioning holes  114  correspondingly. Wherein, the metal sheet  2  and  3  of the present embodiment are copper sheets, but not limited to. In other embodiments, the material of the metal sheet also can be other materials of conductive metal. 
         [0035]    In addition, in practice, a surface of the metal sheet  2  and  3  soldered with the electrical connecting areas  111  and  112  is further configured with multi-segment raised structures, and the electrical connecting areas  111  and  112  are configured with multi-segment concave structures relatively. Thus, when the metal sheet  2  and  3  are soldered to the electrical connecting areas  111  and  112 , the coordination between the raised structure and the concave structure can make the soldering more tightly. This is, the soldering area can be increased in the soldering process. 
         [0036]    The bus  4  includes a bus body  41  and a connecting portion  42 , the bus body  41  is extended along a second extending direction L 2  vertical to the first extending direction L 1 , and the connecting portion  42  is extended from the bus body  41  integrally corresponding to metal sheet  2  along first extending direction L 1 , and the connecting portion  42  is configured with four fixed screwing holes  421  corresponding to metal sheet holes  21 . 
         [0037]    The bus  5  includes a bus body  51  and a connecting portion  52 . The bus body  51  is extended along the second extending direction L 2  vertical to the first extending direction L 1 , and the connecting portion  52  is extended from the bus body  51  integrally corresponding to metal sheet  2  along the first extending direction L 1 . The connecting portion  52  is configured with four fixed screwing holes  521  corresponding to metal sheet holes  21 . Wherein, the buses  4  and  5  of the present embodiment are copper pieces, but not limited to. In other embodiments, the material of the bus also can be other materials of conductive metal. 
         [0038]    In addition, the buses  4  and  5  are configured with an insulating cover respectively in practice (figures not show). 
         [0039]    Four of eight fixed members  6  are passed through the circuit board locking holes  1111  firstly, and then passed through the metal sheet holes  21 . Next, the fixed members  6  are locked in the fixed screwing holes  421  for making the metal sheet  2  and bus  4  be locked on circuit board  1 ; the other fixed members  6  are passed through the circuit board locking holes  1121  firstly, and then passed through the metal sheet holes  31 . Next, the fixed members  6  are locked in the fixed screwing holes  521  for making the metal sheet  3  and the bus  5  be locked on the circuit board  1 . Wherein, the bus  4  can be contacted with the metal sheet  2  tightly for making the bus  4  electrically connect to the metal sheet  2  by the way which the nuts of the fixed members  6  are wedged in circuit board  1 , and locked in the bus  4 . In practice, the metal sheet  2  is soldered to the circuit of the circuit board  1 . Thus, the bus  4  is electrically connected to the circuit of the circuit board  1  via the metal sheet  2 ; similarly, the bus  5  is also contacted tightly and electrically connected to the metal sheet  3  via the lock of the fixed members  6  similarly so as to electrically connected to the circuit of the circuit board  1  via the metal sheet  3 . 
         [0040]    In addition, in the present embodiment, the buses  4 ,  5  are locked on the circuit board  1  and the metal sheets  2 ,  3  by the fixed members  6  which acts in a rotational torque with the range of 20-40 kgf·cm for reducing a impedance value between the buses  4 ,  5  and the circuit board  1 ; wherein, when the fixed members  6  area screws of M5 specification, the chart of the rotational torque and the circuit loss between the buses  4 ,  5  and the circuit board  1  are shown in Table. 1, as follows: 
         [0000]    
       
         
               
             
               
               
             
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 Chart of the rotational torque and the circuit loss. 
               
             
          
           
               
                   
                 Load 
               
             
          
           
               
                   
                 300 A 
                 400 A 
               
             
          
           
               
                 rotational 
                 voltage drop 
                   
                 voltage drop 
                   
               
               
                 torque 
                 (mV) 
                 circuit 
                 (mV) 
                 circuit 
               
             
          
           
               
                 kgf · cm 
                 bus 4 
                 bus 5 
                 loss (W) 
                 bus 4 
                 bus 5 
                 loss (W) 
               
               
                   
               
             
          
           
               
                 20 
                 13.9 
                 20.85 
                 10.425 
                 20.3 
                 31.6 
                 20.76 
               
               
                 25 
                 10.04 
                 15.6 
                 7.692 
                 14.09 
                 22.08 
                 14.468 
               
               
                 30 
                 8.64 
                 13.35 
                 6.597 
                 11.62 
                 18.70 
                 12.128 
               
               
                 35 
                 8.71 
                 11.95 
                 6.198 
                 11.86 
                 16.75 
                 11.444 
               
               
                 40 
                 7.68 
                 10.365 
                 5.4135 
                 10.37 
                 14.11 
                 9.792 
               
               
                   
               
             
          
         
       
     
         [0041]    As shown in the above table, when the rotational torque increases by degrees and be in the range of 20˜40 kgf·cm, the impedance value decreases by degrees relatively. 
         [0042]    Referring to  FIG. 6  to  FIG. 7 ,  FIG. 6  is a three-dimensional schematic drawing illustrating the metal sheet is soldered to the circuit board according to one preferred embodiment of the present invention;  FIG. 7  is a three-dimensional schematic drawing illustrating the bus is disposed in the metal sheet and is fixed by the fixed members according to one preferred embodiment of the present invention. As shown in  FIG. 6  to  FIG. 7 , in practice, firstly, the metal sheets  2 ,  3  can be soldered to the electrical connecting areas  111 ,  112  respectively. Then, the buses  4 ,  5  can be configured to the metal sheets  2 ,  3  respectively. Finally, the buses  4 ,  5  can be locked on the circuit board  1  by the fixed members  6 . 
         [0043]    Referring to  FIG. 8 ,  FIG. 8  is a three-dimensional schematic drawing illustrating the circuit board assembly is applied in the electronic device according to one preferred embodiment of the present invention. As shown in  FIG. 8 , the circuit board assembly  100  of the present invent is disposed in a electronic equipment  200 , wherein the buses  4 ,  5  will penetrate from the electronic equipment  200 , and be electrically connected to a power (not shown). 
         [0044]    To sum up, compared to the circuit board assembly of prior art with plugging port for plugging by the bus directly, the present invent applies the metal sheet to electrically connect with the circuit board and the bus. Thus, the present invent can make the bus electrically connect to circuit board effectively, and increases the stability of the electrical connection between the bus and the circuit board. In addition, users can decrease the impedance value between the bus and the circuit board by increasing the rotational torque of the fixing member in the present invent. 
         [0045]    While the present invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be without departing from the spirit and scope of the present invention.