Abstract:
An inductive component is disclosed. The inductive component comprises a magnetic body and a coil in the magnetic body, wherein a first protrusion and a second protrusion are formed on the bottom surface of the magnetic body, wherein the first protrusion comprises a first electrode disposed on the peak surface of the first protrusion, and the second protrusion comprises a second electrode disposed on the peak surface of the second protrusion, wherein the first electrode and the second electrode are electrically connected to a first end and a second end of the coil, and a space is formed by the first protrusion, the second protrusion and the bottom surface of the magnetic body for accommodating electronic devices.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is a continuation of U.S. patent application Ser. No. 13/175,362 filed on Jul. 1, 2011. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of specification. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The invention relates to an electronic package structure and method for making the same, particularly to an electronic package structure capable of reducing the volume of the electronic package structure and method for making the same. 
         [0004]    2. Description of the Related Art 
         [0005]      FIG. 1  shows a conventional direct current to direct current (DC to DC) converter package structure. As shown in  FIG. 1 , the structure disclosed by U.S. Pat. No. 6,212,086 is a DC-to-DC converter package. The DC-to-DC converter package structure  100  comprises a system circuit board  120 , a copper substrate  110  and a plurality of electronic elements. The system circuit board  120  is placed on the copper substrate  110  and thus the heat can be uniformly dissipated through the copper substrate  110  provided on the bottom of the device. The above electronic elements comprise a main transformer  130 , an output inductor  140 , synchronous rectifiers  150 , output capacitors  160  and input capacitors  170  which are provided on the system circuit board  120  and are electrically coupled to each other through the circuit layout inside the system circuit board  120 . An independent output connector is provided on the right-hand side of the system circuit board  120  and is coupled to the system circuit board  120  through a flexible printed circuit board. 
       BRIEF SUMMARY OF THE INVENTION 
       [0006]    One object of the invention is to provide an electronic package structure and method for making an electronic package structure, capable of reducing the volume of the electronic package structure. Another object of the invention is to provide an electronic package structure and method for making the same, which do not require utilizing any additional mold. 
         [0007]    According to one embodiment of the invention, a method for making an electronic package structure is provided which comprises: providing a substrate; providing an inductor module; assembling the inductor module and the substrate so that the inductor module and the substrate define a space; and injecting package glue into the space defined by the inductor module and the substrate so as to form a package layer. In one embodiment, the above mentioned method further comprises assembling a chip module on the substrate so that the chip module is electrically coupled to a circuit of the substrate. The step of forming a package layer comprises having the package glue coated on the chip module. 
         [0008]    In one embodiment, the step of providing a substrate comprises: forming a main body part of the substrate; and forming at least one first connection part on at least one side of the main body part. The step of providing an inductor module comprises: forming an inductor element of the inductor module; and forming at least one side-wing part on at least one side of the inductor element and having the at least one side-wing part protrude from one surface of the inductor element. The step of assembling the inductor module and the substrate comprises: assembling the at least one first connection part with the at least one side-wing part to provide the inductor module on the substrate so that the inductor element of the inductor module, the at least one side-wing part and the main body part of the substrate together define the space. 
         [0009]    In one embodiment, the step of providing a substrate comprises: forming a main body part of the substrate; and forming at least one side-wing part on at least one side of the main body part and having the at least one side-wing part protrude from one surface of the main body part. The step of providing an inductor module comprises: forming an inductor element of the inductor module; and forming at least one first connection part on at least one side of the inductor element. The step of assembling the inductor module and the substrate comprises: assembling the at least first connection part with the at least one side-wing part to provide the inductor module on the substrate so that the inductor element of the inductor module, the main body part of the substrate and the at least one side-wing part together define the space. 
         [0010]    According to one embodiment of the invention, an electronic package structure comprising a substrate, an inductor module and a package layer is provided. The substrate comprises a circuit for having the electronic package structure in operation. The inductor module operates in coordination with the substrate so as to have the electronic package structure in operation and defines a space together with the substrate. The package layer is positioned in the space. The package layer is formed by injecting package glue into the space defined by the inductor module and the substrate. In one embodiment, the electronic package structure further comprises a chip module provided on the substrate and electrically coupled to a circuit of the substrate. The package layer covers the chip module. In one embodiment, the substrate and the inductor module are in contact with the package layer separately and, in the contact area of the package layer with the substrate and the inductor module, the package layer is substantially filled with a rough structure located in the contact area of the substrate and the inductor module. 
         [0011]    In one embodiment, the substrate comprises a main body part and at least one first connection part. The chip module is provided on the main body part. The at least one first connection part is provided on at least one side of the main body part. The inductor module comprises an inductor element and at least one side-wing part. The at least one side-wing part is provided on at least one side of the inductor element and protrudes from one surface of the inductor element. The at least one side-wing part extends from the inductor element toward the substrate so that the at least one side-wing part is assembled with the first connection part. 
         [0012]    In one embodiment, the substrate comprises a main body part and at least one side-wing part. The chip module is provided on the main body part. The at least one side-wing part is provided on at least one side of the main body part and protrudes from one surface of the inductor element. The inductor module comprises an inductor element and at least one first connection part. The at least one first connection part is provided on at least one side of the inductor element. The at least one side-wing part extends from the main body part toward the inductor module so that the at least one side-wing part is assembled with the first connection part. 
         [0013]    In one embodiment, the electronic package structure is adapted to be provided on a circuit board and the chip module or the inductor module is electrically coupled to the substrate through the circuit board. 
         [0014]    According to one embodiment of the invention, an electronic package structure comprising an inductor module and a package layer is provided. The inductor module comprises an inductor element, a first side-wing part, a second side-wing part and a package layer. The first side-wing part is provided on one side of the inductor element and protrudes from one surface of the inductor element. The second side-wing part is provided on the other side of the inductor element and protrudes from the surface of the inductor element so that the surface, the first side-wing part and the second side-wing part form a space. The package layer is in the space. The width of the package layer is equal to or substantially equal to the distance between the first side-wing part and the second side-wing part. 
         [0015]    In one embodiment, the electronic package structure further comprises a substrate. The substrate comprises a circuit for having the electronic package structure in operation. The inductor module operates in coordination with the substrate so as to have the electronic package structure in operation and the surface of the inductor module, the first side-wing part and the second side-wing part define a space together with the substrate. In one embodiment, the package layer is formed by injecting package glue into the space. 
         [0016]    In one embodiment, the substrate is electrically coupled to the inductor module and the package layer is used to isolate the inductor module from the chip module and conducting wires on the substrate, by which a stack structure is formed. Compared to the prior art in which the elements are directly connected to the plane of a substrate, the embodiment of the invention can effectively utilize space and reduce the volume of the electronic package structure. In one embodiment, the space between the inductor module and the substrate is used as a mold cavity to form a package layer without requiring any additional mold. Accordingly, the production cost is decreased and the design change can be more easily carried out. Furthermore, in another embodiment, the inductor module can be used to cover the chips to inhibit electromagnetic interference (EMI). 
         [0017]    Other objects and advantages of the invention can be better understood from the technical characteristics disclosed by the invention. In order to clarify the above mentioned and other objects and advantages of the invention, examples accompanying with figures are provided and described in details in the following. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0018]      FIG. 1  shows a schematic diagram illustrating a conventional DC-to-DC converter package structure. 
           [0019]      FIGS. 2A-2F  show cross-sectional schematic diagrams illustrating the electronic package structures in each step of the method of making an electronic package structure according to one embodiment of the invention. 
           [0020]      FIGS. 3A-3E  show cross-sectional schematic diagrams illustrating the electronic package structures in a step of the method of making an electronic package structure according to one embodiment of the invention. 
           [0021]      FIG. 3F  shows a three-dimensional schematic diagram illustrating the electronic package structure according to one embodiment of the invention. 
           [0022]      FIG. 4A  shows a top-view schematic diagram illustrating one embodiment of the invention. 
           [0023]      FIG. 4B  shows a side-view schematic diagram illustrating the inductor module according to one embodiment of the invention. 
           [0024]      FIG. 5A  shows a cross-sectional schematic diagram illustrating the electronic package structure according to one embodiment of the invention. 
           [0025]      FIG. 5B  shows an enlarged schematic diagram illustrating the area S of  FIG. 5A . 
           [0026]      FIG. 5C  shows an enlarged schematic diagram illustrating a contact area between the inductor module and the package layer in the embodiment where a mold is used to form the package layer and then the substrate and the inductor module are assembled. 
           [0027]      FIG. 6  shows a cross-sectional schematic diagram illustrating an electronic package structure according to one embodiment of the invention. 
           [0028]      FIG. 7  shows a schematic diagram illustrating an electrical assembly. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0029]      FIGS. 2A-2F  show cross-sectional schematic diagrams illustrating the electronic package structures in each step of the method of making an electronic package structure according to one embodiment of the invention. As shown in  FIGS. 2A-2F , according to one embodiment of the invention, the method for making an electronic package structure comprises the following steps. 
         [0030]    As shown in  FIG. 2A , step S 02 : providing a substrate  310 . In one embodiment, step S 02  comprises: forming a main body part  313  of the substrate  310 ; and forming at least one side-wing part of the substrate  310  on at least one side of the main body part  313  and having the at least one side-wing part to be protruded from one surface of the main body part  313 . Specifically, the substrate  310  comprises a main body part  313  and a first side-wing part  311  and a second side-wing part  312  provided on the two sides of the main body part  313 . In this specification, the substrate is a carrier plate for an electronic package structure functioning in a system. The substrate may further have a circuit for the electronic package structure being in operation. The phrase “an element electrically coupled to the substrate” indicates that the element is directly or indirectly electrically coupled to the circuit of the substrate so that the electronic package structure can operate in a system. Since substrate manufacturing and circuit design on the substrate can be accomplished by one skilled in the art, their detail descriptions will be omitted in this specification. The present invention does not specifically limit the material of the substrate and different substrates can be used for different products. The material of the substrate can be a lead-frame, printed circuit board (PCB), or ceramic or the combination of the above. As the substrate is a lead-frame, the substrate itself is a conductor and can be used to form a circuit. As the substrate is a printed circuit board or ceramic, the substrate can be provided with a circuit layout. In the embodiment shown in  FIG. 2A , the substrate  310  is a lead-frame. 
         [0031]    As shown in  FIG. 2B , step S 04 : assembling a chip module  321  with the main body part  313  of the substrate  310 , wherein the chip module  321  is electrically coupled to the substrate  310 . In one embodiment, the chip module  321  and the main body part  313  of the substrate  310  are bonded together by an adhesive layer  314 . In one embodiment, step S 04  can further comprise having at least one conducting wire  322  be electrically coupled between the chip module  321  and the substrate  310  by wire bonding. 
         [0032]    As shown in  FIG. 2C , step S 06 : bending the first side-wing part  311  and the second side-wing part  312  so that the first side-wing part  311  and the second side-wing part  312  separately extend in a direction away from one surface of the main body part  313  and the chip module  321  is positioned between the first side-wing part  311  and the second side-wing part  312 . 
         [0033]    As shown in  FIG. 2D , step S 08 : providing an inductor module  340 . The inductor module  340  can be a choke module which defines a first groove  351  and a second groove  352  and comprises a choke  343  and a first lead  341  and a second lead  342  provided on the two sides of the choke  343 . Preferably, the positions of the first groove  351  and the second groove  352  correspond to those of the first side-wing part  311  and the second side-wing part  312 , respectively. Besides, the inductor module  340  can further comprise other electronic elements to operate in coordination with the substrate for having the electronic package structure in operation. The choke  343  can be electrically coupled to the first lead  341  and the second lead  342  through these electronic elements. The design of the inductor module  340  can be accomplished by one skilled in the art and thus their detail descriptions will omitted hereafter. 
         [0034]    As shown in  FIG. 2E , step S 10 : assembling the inductor module  340  and the substrate  310  so that the inductor module  340  and the substrate  310  define a space (or called “mold cavity”). In this embodiment, the first side-wing part  311  and the second side-wing part  312  are separately assembled to the first groove  351  and the second groove  352 . In one embodiment, the shape and the size of the first side-wing part  311  are fitted with those of the first groove  351  so that the inductor module  340  can be positioned on the substrate  310 . In one embodiment, the shape and the size of the second side-wing part  312  are fitted with those of the second groove  352 . It should be understood that the way of assembling the inductor module  340  and the substrate  310  is not limited to the above embodiment. In one embodiment, the first side-wing part  311  and the second side-wing part  312  can be separately connection structures and the first groove  351  and the second groove  352  can be separately other connection structures. The connection structure and the other connection structure are fitted to each other to assemble the inductor module  340  and the substrate  310 . These connection structures and other connection structures can be accomplished by one skilled in the art and thus their detail descriptions will be omitted hereafter. 
         [0035]    As shown in  FIG. 2E , step S 12 : injecting package glue into the mold cavity defined by the inductor module  340  and the substrate  310  and performing baking so as to form a package layer  330  which packages the chip module  321  and the conducting wire  322 . Finally, dicing or the like is performed to form a single electronic package structure  300 . 
         [0036]    As shown in  FIG. 2F , according to one embodiment of the invention, the electronic package structure  300  comprises a substrate  310 , a chip module  321 , at least one conducting wire  322 , a package layer  330  and an inductor module  340 . The substrate  310  comprises a main body part  313  and a first side-wing part  311  and a second side-wing part  312  provided on the two sides of the main body part  313 . The chip module  321  is provided on the main body part  313  of the substrate  310  and the conducting wires  322  are connected between the chip module  321  and the substrate  310 . The package layer  330  is provided on the main body part  313  of the substrate  310  and covers the chip module  321  and the conducting wires  322 . The package layer  330  is provided in the space defined by the inductor module  340  and the substrate  310 . The package layer  330  is formed by injecting the thermally melt package glue into the space defined by the inductor module  340  and the substrate  310  and then cooling. The inductor module  340  defines a first groove  351  and a second groove  352  and comprises a first lead  341  and a second lead  342  provided on the two sides of the choke  343 . The first side-wing part  311  and the second side-wing part  312  of the substrate  310  extend toward the inductor module  340  until they reach the first lead  341  and the second lead  342  of the inductor module  340  and are electrically coupled to the first lead  341  and the second lead  342 , separately. 
         [0037]    In one embodiment, the main body part  313  of the substrate  310  can be a printed circuit board or ceramic while the first side-wing part  311  and the second side-wing part  312  can be lead frames provided on the two sides of the main body part  313 . According to this design, the problem can be solved that a printed circuit board or ceramic used as the substrate cannot be bent. In one embodiment of the invention, the electronic package structure  300  may be a DC-to-DC converter package structure. 
         [0038]    According to this embodiment, compared with the prior art, this embodiment has at least one of the following merits. 
         [0039]    In this embodiment, the first side-wing part  311  and the second side-wing part  312  of the substrate  310  are electrically coupled to the first lead  341  and the second lead  342  of the inductor module  340  to form a stack structure. Compared to the prior art shown in  FIG. 1  where the electronic elements are directly connected to the plane of the substrate in general, this embodiment can effectively utilize space and reduce the volume of the electronic package structure  300 . 
         [0040]      FIGS. 3A-3F  show cross-sectional schematic diagrams illustrating the electronic package structures in each step of the method of making an electronic package structure according to one embodiment of the invention. As shown in  FIGS. 3A-3D , according to one embodiment of the invention, the method for making an electronic package structure comprises the following steps. 
         [0041]    As shown in  FIG. 3A , step S 22 : providing a substrate  410 . In one embodiment, step S 22  comprises: forming a main body part  413  of the substrate  410 ; and forming at least one connection part of the substrate  410  on at least one side of the main body part  413 . Therefore, the substrate  410  comprises a main body part  413  and a first connection part  411  and a second connection part  412  provided on the two sides of the main body part  413 . In one embodiment, the substrate  410  can comprise a circuit for having the electronic package structure in operation. The present invention does not specifically limit the material of the substrate and different substrates can be used for different products. The material of the substrate can be a lead-frame, printed circuit board (PCB), or ceramic, etc.  FIG. 4A  shows a top-view schematic diagram illustrating the substrate of this embodiment of the invention. As shown in  FIG. 4A , in one embodiment, the first connection part  411  and the second connection part  412  may be openings or notches defined by the substrate  410  and their shapes are not limited. Besides, in another embodiment, they can be bumps (not shown). Specifically, in one embodiment, the substrate is a lead frame, and the step S 22  comprises the following steps: S 202  and S 204 . Step S 202 : performing semi-etching on the lead-frame and step S 204 : plating silver on one surface of the lead-frame. 
         [0042]    As shown in  FIG. 3B , step S 24 : assembling a chip module  321  with the main body part  413  of the substrate  410 , wherein the chip module  321  is electrically coupled to the substrate  410 . In one embodiment, step S 24  can further comprise having at least one conducting wire  322  be electrically coupled between the chip module  321  and the substrate  410  by wire bonding. Specifically, the step S 24  comprises the following steps in one embodiment. Step S 402 : glue dispensing, that is, coating an adhesive layer  414  on the substrate  410  where the adhesive layer  414  can be conductive glue or non-conductive glue. Step S 404 : die bonding, that is, placing the chip module  321  on the adhesive layer  414 . Step S 406 : wire bonding (such as Au wire bond), that is, having the conducting wires  322  be coupled to the chip module  321  and the lead-frame. 
         [0043]    As shown in  FIG. 3C , step S 26 : providing an inductor module  440 . In one embodiment, step S 26  comprises: forming an inductor element of the inductor module  440 ; and forming at least one side-wing part protruding from one surface of the inductor element on at least one side of the inductor element. Specifically, the inductor module  440  may be a choke module and comprise a choke  443  as the inductor element and a first side-wing part  441  and a second side-wing part  442 . The first side-wing part  441  and the second side-wing part  442  are separately provided on the two sides of the choke  443 , and they also protrude from the bottom surface of the choke  443  and extend in a direction away from the bottom of the choke  443 . The free ends of the first side-wing part  441  and the second side-wing part  442  form a third connection part  44   a  and a fourth connection part  44   b , respectively. The shape of the third connection part  44   a  is fitted with that of the first connection part  411  and the shape of the fourth connection part  44   b  is fitted with that of the second connection part  412  so that the third connection part  44   a  has the function of assembling with the first connection part  411  and the fourth connection part  44   b  has the function of assembling with the second connection part  412 .  FIG. 4B  shows a side-view schematic diagram illustrating the inductor module  440  according to one embodiment of the invention. As shown in  FIG. 4B , in this embodiment, the third connection part  44   a  (and the fourth connection part  44   b ) can be a bump while in another embodiment it can be an opening or a notch. Besides, the inductor module  440  can further comprise other electronic elements to operate in coordination with the substrate  410  for having the electronic package structure  400  in operation. The choke  443  can be electrically coupled to the substrate  410  through these electronic elements to have the electronic package structure  400  in operation. The design of the inductor module  440  can be accomplished by one skilled in the art and thus the details will omitted hereafter. 
         [0044]    As shown in  FIG. 3D , step S 28 : assembling the third connection part  44   a  and the first connection part  411  and assembling the fourth connection part  44   b  and the second connection part  412  so that the inductor module  440  is provide on the substrate  410  to define a space between the inductor module  440  and the substrate  410 . Specifically, the choke  443 , the first side-wing part  441 , the second side-wing part  442  and the main body part  413  define the space (or called “mold cavity”). Furthermore, welding materials and metal welding can be used to further weld the junction of the third connection part  44   a  and the first connection part  411  and the junction of the fourth connection part  44   b  and the second connection part  412  to further reinforce the junction strength between the third connection part  44   a  and the first connection part  411  and between the fourth connection part  44   b  and the second connection part  412 . Thus, the inductor module  440  can be steadily electrically coupled to the substrate  410 . Auxiliary materials can be added into the welding materials and the auxiliary material can be conductive or non-conductive. 
         [0045]    As shown in  FIG. 3E , step S 30 : injecting package glue into the space defined by the inductor module  440  and the substrate  410  to form a package layer  330 . In one embodiment, the thermally melt package glue is injected into the space defined by the inductor module  440  and the substrate  410  and then baked and cooled to form the package layer  330  so that the chip module  321  and the conducting wire  322  are packaged. Finally, dicing or the like is performed to form a single electronic package structure  300 . In this embodiment, as shown in  FIG. 3F  (described later), the first side-wing part  441  and the second side-wing part  442  separately form a plane or a wall. After the inductor module  440  is positioned on the substrate  410 , the choke  443  of the inductor module  440 , the first side-wing part  441 , the second side-wing part  442  and the substrate  440  define a space and openings are formed on the two sides of the space. A glue dispensing device can inject the package glue into the space through the opening. Since the first side-wing part  441  and the second side-wing  442  block the flow of the package glue, after the package glue is cured and the package layer  330  is formed, the width of the package layer  330  is substantially equal to the distance between the first side-wing part  441  and the second side-wing part  442 . 
         [0046]      FIG. 3F  shows a three-dimensional schematic diagram illustrating the electronic package structure according to one embodiment of the invention.  FIG. 3F  does not show the package layer in order to clearly show the inside structure of the electronic package structure. As shown in  FIGS. 3E and 3F , according to one embodiment of the invention, the electronic package structure  400  comprises a substrate  410 , a chip module  321 , at least one conducting wire  322 , a package layer  330  and an inductor module  440 . The substrate  410  comprises a main body part  413  and a first connection part  411  and a second connection part  412  provided on the two sides of the main body part  413 . In this embodiment, the first connection part  411  and the second connection part  412  can be openings or notches defined by the substrate  410 . The chip module  321  is provided on the main body part  413  of the substrate  410  and the conducting wires  322  are coupled between the chip module  321  and the substrate  410 . The inductor module  440  can be a choke module and comprises a choke  443 , a first side-wing part  441  and a second side-wing part  442 . The first side-wing part  441  and the second side-wing part  442  are separately provided on the two sides of the choke  443  and protrude from the bottom surface of the choke  443  to extend toward the substrate  410 . The free ends of the first side-wing part  441  and the second side-wing part  442  form a third connection part  44   a  and a fourth connection part  44   b , respectively. The third connection part  44   a  is welded to the first connection part  411  and the fourth connection part  44   b  is welded to the second connection part  412  by metal welding so that the inductor module  440  is provided on the substrate  410  and a space is defined between the inductor module  440  and the substrate  410 . The package layer  330  is provided in the space defined between the inductor module  440  and the substrate  410  and covers the chip module  321  and the conducting wires  322 . The package layer  330  is formed by injecting the thermally melt package glue into the space defined by the inductor module  440  and the substrate  410  and then cooling it. 
         [0047]    According to this embodiment, compared to the previous embodiments, this embodiment has at least one of the following merits. 
         [0048]    1. As shown in  FIG. 3E , since the first side-wing part  441  and the second side-wing part  442  extend from the choke  443  toward the main body part  413  of the substrate  410 , the inductor module  440  can cover the chip module  321  to thereby inhibit electromagnetic inference (EMI). 
         [0049]    2. In addition to being dissipated from the backside of the substrate  410 , the heat generated by the chip module  321  can be transmitted from the substrate  410  through the first side-wing part  441  and the second side-wing part  442  to the choke  443  to be dissipated by the inductor module  440  so that better heat dissipation can be achieved. 
         [0050]    3. A mold cavity is defined between the inductor module  440  and the substrate  410  and thus no additional mold is required so that the production cost can be reduced and the design change can be easily carried out. 
         [0051]    Furthermore, in one embodiment, the electronic package structure shown in  FIG. 2E  and  FIG. 3E  can have the following merits. In one embodiment where the package layer is formed by using a mold to and then the substrate and the inductor module are assembled, due to the process limitation, the distance H between the conducting wire and the package layer should reserve a predetermined distance and a required tolerance distance in advance for placing and accurately aligning the mold. However, according to the embodiment of  FIG. 2F , the shape and the size of the first side-wing part  311  are fitted with those of the first groove  351  and/or the shape and the size of the second side-wing part  312  are fitted with those of the second groove  352 . According to the embodiment of  FIG. 3E , since the shape of the third connection part  44   a  is fitted with that of the first connection part  411  and the shape of the fourth connection part  44   b  is fitted with that of the second connection part  412 , after the third and fourth connection parts  44   a  and  44   b  are assembled to the first and second connection parts  411  and  412 , respectively, the positioning function is accomplished. Thus, the accurate alignment and positioning required in the prior art using the mold is not needed for this embodiment of the invention. The distance H between the conducting wire and the package layer can be reduced to thereby further reduce the volume of the electronic package structure. 
         [0052]      FIG. 5A  shows a cross-sectional schematic diagram illustrating the electronic package structure according to one embodiment of the invention. The electronic package structure  400   a  of the embodiment in  FIG. 5A  is similar to the electronic package structure  400  of the embodiment in  FIG. 3E . Thus, the same element uses the same symbol and its detailed description is omitted. In one embodiment, the main body part  413  can be provided with other electronic elements in addition to the chip module  321  in order to have the electronic package structure  400   a  possessing various different functions. As shown in  FIG. 5 , additionally, a resistor  325 , a capacitor  326  and a MOS transistor  327  are provided on the main body part  413 . 
         [0053]    Besides, in one embodiment, the package layer  330  is formed by injecting the thermally melt package glue into the space defined by the inductor module  440  and the substrate  410  and then cooling. The inductor module  440  and the substrate  410  are in contact with the package layer  330 , separately. In the contact area of the package layer  330  with the substrate  410  and the inductor module  440 , the package layer  330  is substantially filled with a rough structure located in the contact area of the substrate  410  and the inductor module  440 . The area S shown in  FIG. 5A  is the contact area between the side-wing plate  442  of the inductor module  440  and the package layer  330 .  FIG. 5B  shows an enlarged schematic diagram illustrating the area S of  FIG. 5A . Microscopically, in the contact area S between the side-wing plate  442  of the inductor module  440  and the package layer  330 , the surface of the side-wing plate  442  has a rough structure. When the package layer  330  is formed by injecting the thermally melt package glue into the space defined by the inductor module  440  and the substrate  410  and then cooling, the package layer  330  is substantially filled with the rough structure in the contact area S.  FIG. 5C  shows an enlarged schematic diagram illustrating a contact area between the inductor module and the package layer in the embodiment where a mold is used to form the package layer and then the substrate and the inductor module are assembled. As shown in  FIG. 5C , according to the embodiment where a mold is used to form the package layer and then the substrate and the inductor module are assembled, microscopically, in the contact area A between the inductor module  440  and the package layer  330 , the boundary L of the package layer  330  is only in contact with a rough structure located in the contact area A of the inductor module  440 . The rough structure in the contact area A will not be filled with the thermally melt package glue. 
         [0054]      FIG. 6  shows a cross-sectional schematic diagram illustrating the electronic package structure according to one embodiment of the invention. The electronic package structure  400   b  of the embodiment in  FIG. 6  is similar to the electronic package structure  400   a  of the embodiment in  FIG. 5 . Thus, the same element uses the same symbol and its detailed description is omitted. As described in the above, the invention does not limit the material of the substrate  410 . The material of the substrate  410  can be a lead-frame, a printed circuit board or ceramic, etc. In this embodiment, the substrate  410  uses the composite material and the main body part  413  comprises a printed circuit board  31 , a first lead-frame  32 , a second lead-frame  33 , a third lead-frame  34 . More complicated circuits can be provided on the printed circuit board  31  and the printed circuit board  31  generates more pins to be electrically coupled with the chip module  321 . Finally, the printed circuit board  31  is provided on the first lead-frame  32 . The heat dissipation of the first lead-frame  32  is better than the printed circuit board  31 . Therefore, according to the design of the electronic package structure  400   b , more complicated circuits can be included and better heat dissipation can be accomplished. 
         [0055]      FIG. 7  shows a schematic diagram illustrating an electrical assembly. The electrical assembly comprises the electronic package structure of one embodiment of the invention installed on a printed circuit board. As shown in  FIG. 7 , the electrical assembly  500  comprises a printed circuit board  510  and the electronic package structure  400  of the embodiment shown in  FIG. 3E . The printed circuit board  510  comprises a circuit. The electronic package structure  400  is provided on the printed circuit board  510  to form another type of the electrical assembly. In this embodiment, the chip module  321  or the inductor module  440  is not directly electrically coupled to the substrate  410  but indirectly electrically coupled to the substrate  410  through the circuit of the printed circuit board  510 . 
         [0056]    Although the present invention has been fully described by the above embodiments, the embodiments should not constitute the limitation of the scope of the invention. Various modifications or changes can be made by those who are skilled in the art without deviating from the spirit of the invention. Any embodiment or claim of the present invention does not need to reach all the disclosed objects, advantages, and uniqueness of the invention. Besides, the abstract and the title are only used for assisting the search of the patent documentation and should not be construed as any limitation on the implementation range of the invention.