Abstract:
A portable terminal according to the present disclosure may include an information display part including a display screen displaying information and a battery; and a band part fastened to the information display part, wherein the band part includes a charging coil wirelessly receiving power to transfer the power to the battery.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of Korean Patent Application No. 10-2013-0138630 filed on Nov. 14, 2013, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
     BACKGROUND 
     The present disclosure relates to a portable terminal, a wireless charging device, and a wireless charging structure thereof, and more particularly, to a portable terminal capable of being worn on a wrist and able to be easily charged, a wireless charging device, and a wireless charging structure thereof. 
     Generally, in accordance with the trend toward high sensitivity, miniaturization, and lightness of electronic components, portable terminals have also become highly sensitive while being miniaturized and lightened. As first generation mobile phones, bar type mobile phones became common, while as second generation mobile phones, flip type mobile phones became generalized. Currently, flip type mobile phones and third generation folding type mobile phones tend to be generalized and coexist on the market. 
     In addition, recently, watch-type portable terminals that are wearable on the wrist of a user have been developed and released. 
     In general, watch-type portable terminals have a rechargeable battery embedded therein. Therefore, there is a need to periodically supply power to the battery for the battery to be charged. 
     However, according to the related art, a method of directly connecting a power supply cable from an adaptor to the watch-type portable terminal to charge the battery therein has been mainly used. Therefore, such a watch-type portable terminal should be repetitively connected to the cable whenever the battery thereof is to be charged. 
     RELATED ART DOCUMENT 
     (Patent Document 1) Korean Patent Laid-Open Publication No. 2011-0064237 
     SUMMARY 
     An exemplary embodiment in the present disclosure may provide a wrist wearable portable terminal capable of being wirelessly charged, a wireless charging device, and a wireless charging structure thereof. 
     According to an aspect of the present disclosure, a portable terminal may include: an information display part including a display screen displaying information and a battery; and a band part fastened to the information display part, wherein the band part includes a charging coil wirelessly receiving power to transfer the power to the battery. 
     The band part may include at least one through hole, and the charging coil may be disposed in a spiral manner, based on the at least one through hole. 
     The band part may include a fastening member provided at one end thereof, and the band part may be formed to have a ring shape capable of being worn on a wrist by the coupling of fastening member and the at least one through hole. 
     The charging coil may be formed in the manner of a board to thereby be embedded in the band part. 
     The charging coil may be formed in the manner of a wire to thereby be embedded in the band part. 
     The band part may include a plurality of through holes, and the charging coil may be disposed in a spiral manner, around a circumference of each of the plurality of through holes. 
     The charging coils disposed around the circumference of each of the plurality of through holes may be connected in parallel to each other. 
     The charging coils disposed around the circumference of each of the plurality of through holes may be connected in series to each other. 
     The band part may further include an auxiliary hole disposed between each of the plurality of through holes. 
     According to an embodiment inaspect in the present disclosure, a wireless charging device may include: a core part including upper and lower cores; a protrusion part protruding from at least one of the upper and lower cores; and a transmission coil disposed in a spiral manner, based on the protrusion part. 
     In the core part, the upper and lower cores may be coupled to each other in a manner in which a distal end of the protrusion part comes into surface-contact with the core part. 
     The protrusion part may be formed from the lower core, and the upper core may be formed to have a flat plate shape. 
     The protrusion part may be formed from each of the upper and lower cores, and in the core part, the upper and lower cores may be coupled to each other in a manner in which distal ends of the protrusion parts come into surface-contact with each other. 
     The protrusion part may be formed from each of the upper and lower cores, and in the core part, the upper and lower cores may be coupled to each other in a manner in which the protrusion parts are offset from each other. 
     The transmission coil may be formed in the manner of a coil board or a wire. 
     According to an embodiment inaspect in the present disclosure, a wireless charging structure may include: a wireless charging device including upper and lower cores, a protrusion part protruding from at least one of the upper and lower cores, and a transmission coil disposed in a spiral manner, based on the protrusion part; and a portable terminal interposed between the upper and lower cores so that the protrusion part is inserted into a through hole formed therein, wherein in the portable terminal, a charging coil is disposed around a circumference of the through hole. 
     According to an embodiment inaspect in the present disclosure, a wireless charging structure may include: a wrist wearable portable terminal including a charging coil embedded in a band part; and a wireless charging device in which the band part of the portable terminal is interposed between upper and lower cores, and power is wirelessly transmitted to the charging coil through a transmission coil disposed on the upper or lower core. 
     The band part may include at least one through hole formed therein, and at least one of the upper and lower cores may include a protrusion part inserted into the at least one through hole. 
     The charging coil may be disposed around a circumference of the at least one through hole, and the transmission coil may be disposed around a circumference of the protrusion part. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other aspects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a plan view schematically illustrating a portable terminal according to an exemplary embodiment in the present disclosure; 
         FIG. 2  is a partially enlarged transparent plan view of part A of  FIG. 1 ; 
         FIG. 3  is a cross-sectional view taken along line B-B′ of  FIG. 2 ; 
         FIG. 4  is a perspective view schematically illustrating a wireless charging device according to an exemplary embodiment in the present disclosure; 
         FIG. 5  is a cross-sectional view taken along line C-C′ of  FIG. 4 ; 
         FIG. 6  is a cross-sectional view schematically illustrating a wireless charging device according to an exemplary embodiment in the present disclosure; 
         FIG. 7  is a partial plan view schematically illustrating a band part of a portable terminal according to an exemplary embodiment in the present disclosure; 
         FIGS. 8 and 9  are cross-sectional views schematically illustrating a wireless charging device of the portable terminal illustrated in  FIG. 7 ; and 
         FIG. 10  is a partial plan view schematically illustrating a band part of a portable terminal according to an exemplary embodiment in the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments in the present disclosure will be described in detail with reference to the accompanying drawings. 
     The disclosure may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. 
     In the drawings, the shapes and dimensions of elements may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or like elements. 
       FIG. 1  is a plan view schematically illustrating a portable terminal according to an exemplary embodiment in the present disclosure, and  FIG. 2  is a partially enlarged transparent plan view of part A of  FIG. 1 . In addition,  FIG. 3  is a cross-sectional view taken along line B-B′ of  FIG. 2 . 
     Referring to  FIGS. 1 through 3 , a portable terminal  100  according to the present exemplary embodiment may include an information display part  110  and a band part  120 . 
     The information display part  110  may display various types of information to a user of the portable terminal  100 . Here, information may include visual information and include all of information related to various contents requested by or additionally supplied to a user. 
     To this end, the information display part  110  may include a display screen on which information is displayed to the user, an input button receiving a request from the user, and a battery supplying power to the portable terminal  100 . 
     Here, as the display screen, a liquid crystal display (LCD) may be used, but the present disclosure is not limited thereto. In addition, the input button may include a physical button or touch screen. 
     The battery may be embedded in the information display part  110  and supply power to the display screen, or the like. In addition, the battery may be electrically connected to a charging coil  130  to be described below. 
     Meanwhile, the case in which the battery is embedded in the information display part  110  is described by way of example in the present exemplary embodiment, but a configuration of the present disclosure is not limited thereto. The present disclosure may be variously modified. For example, the battery may be embedded in a band part  120  to be described below. 
     The band part  120  may be fastened to the information display part  110  to wear the information display part  110  on a wrist of a user. Therefore, the band part  120  may be formed of a flexible material. More specifically, the band part  120  may be formed of a resin or rubber material. However, the present disclosure is not limited thereto. 
     The present disclosure may be variously modified. For example, the band part may be formed using an insulating material containing ferrite or metal particles. 
     Two band parts  120  may be fastened to both ends of the information display part  110 , respectively, as illustrated in  FIG. 1 , and a fastening member  121  may be provided at one end of any one of the band parts  120 . In addition, at least one through hole  125  may be formed in the other band part  120 . 
     Here, the through hole  125  may be a hole for coupling the fastening member  121 . Therefore, the band part  120  may have a ring shape by the coupling of the fastening member  121  and the through hole  125 , such that the band part  120  may be worn a wrist of a user, or the like. However, the configuration of the present disclosure is not limited thereto. That is, the through hole  125  may also be formed in the band part  120  to which the fastening member  121  is coupled. 
     In addition, the band part  120  according to the present exemplary embodiment may include the charging coil  130 . The charging coil may be provided in a manner in which the charging coil is attached to one surface of the band part  120  or in a manner in which the charging coil is embedded in the band part  120 .  FIG. 2  transparently illustrates the charging coil  130  embedded in the band part  120 . 
     The charging coil  130  may be provided in order to charge the battery embedded in the information display part  110 . 
     The charging coil  130  may be embedded in the band part  120  in a form of a coil board  132 . 
     In this case, as the coil board, a film or a flexible printed circuit board (PCB) having a reduced thickness and including a wiring pattern formed thereon such as a thin printed circuit board, or the like, may be used. 
     A coil pattern  133  formed on the coil board  132  may be formed in the manner of a wiring pattern on at least one surface of the coil board  132 . In the present exemplary embodiment, the coil pattern  133  may be formed on both surfaces of the coil board  132  in a spiral shape, and both ends thereof may be electrically connected to the battery. 
     In the case in which the coil pattern  133  is formed on both surfaces of the coil board  132 , in each of the coil patterns  133 , both ends thereof may be electrically connected to thereby entirely form a parallel circuit, or one end of the center thereof may be connected to thereby form a serial circuit. 
     In addition, a conductive via (not shown) for electrically connecting the coil patterns  133  may be formed in the coil board  132 . Therefore, in the case of portions on which the coil patterns  133  are overlapped with each other, the coil pattern  133  may be formed on the other surface of the coil board through the conductive via. 
     Meanwhile, although the case in which the coil pattern  133  has a generally rectangular spiral shape is described by way of example in the present exemplary embodiment, the present disclosure is not limited thereto but may be variously modified. For example, the coil pattern  133  may have a circular spiral shape, a polygonal spiral shape, or the like. 
     Further, the charging coil  130  according to the present exemplary embodiment may be formed in the spiral manner, around a circumference of the through hole  125  based on the through hole  125  of the band part  120 . Therefore, in the case in which a plurality of through holes  125  are formed in the band part  120 , the coil pattern  133  may be formed around each of the through holes  125 . 
     Each of the coil patterns  133  as described above may be electrically connected to each other. For example, as illustrated in  FIG. 3 , the coil patterns  133  formed around the circumference of each of the through holes  125  may be connected in parallel to each other. However, the present disclosure is not limited thereto. 
     Meanwhile, the case in which the charging coil  130  is provided in a form of a thin board is described by way of example in the present exemplary embodiment, but the configuration of the present disclosure is not limited thereto. The present disclosure may be variously modified. For example, the charging coil  130  may be formed in the manner of a conducting wire, that is, a wire to thereby be embedded in the band part  120 . 
     The portable terminal  100  configured as described above may be supplied with power by a wireless charging device  150  to be described below. 
       FIG. 4  is a perspective view schematically illustrating a wireless charging device according to an exemplary embodiment in the present disclosure; and  FIG. 5  is a cross-sectional view taken along line C-C′ of  FIG. 4 . 
     Referring to  FIGS. 4 and 5 , the wireless charging device  150  according to the present exemplary embodiment may be provided in order to charge the battery of the portable terminal  100 . 
     The wireless charging device  150  may convert household alternate current (AC) power supplied from the outside into direct current (DC) power and again convert the DC current into AC voltage having a predetermined frequency to thereby provide the AC voltage to the portable terminal  100 . To this end, the wireless charging device  150  may include a core part  160  and a transmission coil  180 . 
     The band part  120  of the portable terminal  100  may be mounted in the core part  160 . To this end, the core part  160  may include upper and lower cores  162  and  164 . The upper and lower cores  162  and  164  may be coupled to each other to form a continuous magnetic circuit. 
     In addition, the core part  160  may include at least one protrusion part  170  inserted into the through hole  125  of the band part  120  of the portable terminal  100 . Therefore, the protrusion part  170  may be formed to have a shape corresponding to a shape of the through hole. 
     The case of forming a plurality of protrusion parts  170  on the lower core  164  and forming the upper core  162  in a flat plate shape to thereby form the core part  160  in an entirely “EI” shape is described by way of example in the present exemplary embodiment. In this case, the upper core  162  may be coupled to the lower core  164  while coming into contact with a distal end of the protrusion part  170  of the lower core  164  to form a completed magnetic circuit. 
     However, the configuration of the present disclosure is not limited thereto, but may be variously modified as in other exemplary embodiments to be described below. 
     As the protrusion part  170  is provided, the portable terminal  100  may be seated in the wireless charging device  150  so that the protrusion part  170  is inserted into the through hole  125  of the band part  120 . Therefore, the portable terminal  100  according to the present exemplary embodiment may always be seated at the same position. In addition, since the charging coil  130  of the portable terminal  100  may always be disposed in a position corresponding to a transmission coil  180  to be described below by the protrusion part  170 , charging efficiency may be improved. 
     The transmission coil  180  may be wound in a spiral manner, based on the protrusion part  170  formed from the core part  160 . The transmission coil  180  may be formed in the manner of a coil board similarly to the charging coil  130  of the portable terminal  100  and formed in the manner of a wire as in the present exemplary embodiment. 
     In addition, the transmission coil  180  may be disposed around all of the protrusion parts  170  as in the present exemplary embodiment, but the present disclosure is not limited thereto. If necessary, the transmission coil  180  may be selectively disposed. 
     A wireless charging method using a wireless charging structure according to the present exemplary embodiment configured as described above is as follows. 
     First, the band part  120  of the portable terminal  100  may be mounted on the lower core  164  in a state in which the upper core  162  of the wireless charging device  150  is opened. In this case, the protrusion part  170  of the lower core  164  may be disposed so as to be inserted into the through hole  125  of the band part  120 . 
     Subsequently, the upper core  162  may be coupled to the lower core  164 . Therefore, the core part  160  may form a closed magnetic circuit. 
     Then, AC voltage may be applied to the transmission coil  180  of the wireless charging device  150 , thereby changing a magnetic field around the transmission coil  180 . Therefore, the charging coil  130  of the portable terminal  100  coupled to the wireless charging device  150  may be applied with voltage according to a change in the magnetic field, such that the battery of the portable terminal  100  is charged. 
     Meanwhile, the wireless charging device according to the present disclosure is not limited to the above-mentioned embodiment but may be variously modified. 
       FIG. 6 , which is a cross-sectional view schematically illustrating a wireless charging device  250  according to an exemplary embodiment in the present disclosure, illustrates a cross section corresponding to the cross section of  FIG. 4 , taken line C-C. 
     Referring to  FIG. 6 , in the wireless charging device  250  according to the present exemplary embodiment, an upper core  162  and a lower core  164  may be formed to have an EE shape and coupled to each other. That is, protrusion parts  170  may also be formed from the upper core  162 . 
     Therefore, the protrusion part  170  according to the present exemplary embodiment is formed to have a protrusion length shorter than that of the protrusion part  170  according to the above-mentioned exemplary embodiment, and the upper and lower cores  162  and  164  may be coupled to each other in a manner in which distal ends of the protrusion parts  170  come into surface-contact with each other, respectively. 
     Therefore, in the wireless charging device  250  according to the present exemplary embodiment, a transmission coil  180  may be disposed on the upper core  162  as well as the lower core  164 . In this case, the transmission coil  180  may be disposed in a spiral manner, based on the protrusion part  170 , similarly to the above-mentioned exemplary embodiment. 
     In the wireless charging structure according to the present exemplary embodiment configured as described above, the charging coil  130  may be embedded in the band part  120  of the portable terminal  100 . Therefore, the charging coil  130  may be disposed on a wider area as compared to the case of forming the charging coil  130  in the information display part  110  or the fastening member  121 , such that charging efficiency may be improved. 
     Further, in the wireless charging devices  150  and  250  according to the present exemplary embodiments, the protrusion part  170  may penetrate through the through hole  125  formed in the band part  120  of the portable terminal  100  to thereby be coupled thereto, thereby forming a closed magnetic circuit. Therefore, since a leakage magnetic flux generated during a charging process may be significantly decreased, charging efficiency may be improved. 
     In addition, since the protrusion part  170  is inserted into the through hole  125 , at the time of charging, the charging coil  130  and the transmission coil  180  may always be disposed at regular intervals. Therefore, whenever the battery is charged, optimal charging efficiency may be maintained. 
     In addition, since the core part  160  is disposed in a shape in which the core part  160  encloses the charging coil  130  of the portable terminal  100 , an effect of shielding electromagnetic waves from being introduced into the charging coil  130  from the outside may be obtained. 
     Meanwhile, the portable terminal, the wireless charging device, and the wireless charging structure according to the present disclosure are not limited to the above-mentioned exemplary embodiments, but may be variously modified. 
       FIG. 7 , which is a partial plan view schematically illustrating a band part of a portable terminal according to an exemplary embodiment in the present disclosure, illustrates a plan corresponding to that in  FIG. 2 . In addition,  FIGS. 8 and 9 , which are cross-sectional views schematically illustrating a wireless charging device of the portable terminal illustrated in  FIG. 7 , show cross sections corresponding to that in  FIG. 5 . 
     First, referring to  FIG. 7 , a portable terminal  200  according to the present exemplary embodiment may further include an auxiliary hole  127  in addition to a through hole  125  described in the above-mentioned exemplary embodiment. 
     A single or a plurality of auxiliary holes  127  may be disposed between the through holes  125  so as to be spaced apart from each other by a predetermined interval. 
     Accordingly, as illustrated in  FIG. 8 , a wireless charging device  350  according to the present exemplary embodiment may include a protrusion part  170  inserted into the through hole  125  and a protrusion part  172  inserted into the auxiliary hole  127 . 
     The case in which the protrusion part  170  inserted into the through hole  125  is formed from a lower core  164 , and the protrusion part  172  inserted into the auxiliary hole  127  is formed from an upper core  162  is illustrated by way of example in  FIG. 8 . In this case, the protrusion part  170  of the upper core  162  and the protrusion part  172  of the lower core  164  may be coupled to each other in a manner in which they are offset from each other. 
     In the case in which the auxiliary hole  127  is formed in the band part  120  and the protrusion part  172  is coupled through the auxiliary hole  127  as described above, since a magnetic circuit may be further expanded by the protrusion part  172  of the auxiliary hole  127 , leakage or saturation of a magnetic flux may be significantly decreased. 
     In addition, in  FIG. 9 , protrusion parts  170  are formed from both of the upper and lower cores  162  and  164 , similarly to the above-mentioned exemplary embodiment illustrated in  FIG. 6  such that the upper and lower cores  162  and  164  may be coupled to each other so that distal ends of the protrusion parts  170  come into surface-contact with each other. Therefore, each of the protrusion parts  170  may come into contact with each other in the through hole  125  and the auxiliary hole  127 . 
       FIG. 10 , which is a partial plan view schematically illustrating a band part of a portable terminal according to an exemplary embodiment in the present disclosure, illustrates a plan corresponding to that in  FIG. 2 . 
     In a portable terminal  300  according to the present exemplary embodiment, charging coils  130  provided in a band part  120  are connected in series to each other. That is, coils formed around each of the through holes  125  may entirely form a single serial circuit. 
     Meanwhile, although the case in which only a single coil strand is formed on the coil board is described by way of example in the above-mentioned exemplary embodiment, the configuration of the present disclosure is not limited thereto. That is, the present disclosure may be variously modified. For example, the coil board may be formed so as to have a plurality of coil strands. 
     In addition, although the case in which only a single through hole is disposed in the center of the spiral shaped pattern is described by way of example in the above-mentioned exemplary embodiments, the configuration of the present disclosure may be variously modified. That is, two or more through holes may be disposed in the center of the spiral shaped pattern. In this case, a transmission coil of a wireless charging device may be formed to have a shape corresponding thereto. 
     In addition, although the portable terminal worn on a wrist is described by way of example in the above-mentioned exemplary embodiments, the present disclosure is not limited thereto, and the present disclosure may be widely applied to various portable products capable of being worn such as a belt, a necklace, or the like. 
     As set forth above, in the wireless charging structure according to exemplary embodiments in the present disclosure, the charging coil is embedded in the band part of the portable terminal. Therefore, the charging coil may be disposed on a wider area as compared to the case of forming the charging coil in the information display part or in the fastening member, such that charging efficiency may be improved. 
     Further, in the wireless charging device according to exemplary embodiments in the present disclosure, the protrusion part may be coupled while penetrating through the through hole formed in the band part of the portable terminal, thereby forming the closed magnetic circuit. Therefore, since the leakage magnetic flux generated during the charging process may be significantly decreased, charging efficiency may be improved. 
     In addition, since the protrusion part is inserted into the through hole, at the time of charging, the charging coil and the transmission coil may always be disposed at regular intervals. Therefore, whenever the battery is charged, optimal charging efficiency may be maintained. 
     Further, at the time of charging, since the core part is disposed in a shape in which the core part encloses the charging coil of the portable terminal, the effect of shielding electromagnetic waves from being introduced into the charging coil from the outside may be obtained. 
     While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the scope of the present invention as defined by the appended claims.