KR102370584B1 - Accessory for wireless charging and wireless charging system thereof - Google Patents

Abstract

The present invention relates to a terminal accessory for wireless charging and a wireless charging system including the same, wherein the terminal accessory is fixed to a rear surface of a portable terminal to enable wireless charging, comprising: a housing having an internal space; a transmitting coil accommodated in the inner space of the housing and generating a magnetic field for magnetic induction wireless charging; and a plurality of electrodes accommodated in the inner space of the housing so as to surround at least a portion of the outer region of the transmitting coil and configured to receive power supplied to the transmitting coil from the outside; a first electrode of an anode connected to one and having first and second contacts respectively exposed to the outside in the upper and left directions of the housing; and a negative second electrode connected to the other one of both ends of the transmitting coil and having third and fourth contact points exposed to the outside in the lower and right directions of the housing, respectively.

Description

Terminal accessory for wireless charging and wireless charging system including same

The present invention relates to a wireless charging system, and more particularly, to an accessory for wireless charging that can be conveniently attached to a portable terminal such as a smart phone and enables wireless charging, and a wireless charging system including the same.

Various types of vehicle cradles have been developed to make it convenient to use electronic devices, including smartphones, while driving.

Recently, due to the development of smart phones, various functions such as vehicle navigation and black box are integrated into smart phones, so the need for a car cradle is increasing.

In general, a vehicle cradle has a structure in which a smartphone is fitted to one end, and then the opposite end is adsorbed to the vehicle's glass, dashboard, or the like. However, the vehicle holder has a problem in that the structure is complicated and the vehicle holder is easily separated from the attachment surface due to the high weight. In addition, when you want to use the smartphone while driving, you have to push the smartphone to the side from the vehicle cradle to release the fitted state, which is cumbersome to use.

Therefore, recently, a minimalist method of attaching a smart ring to the rear of a smartphone and inserting the smart ring into the air vent of a vehicle is popular.

Such a smart ring has advantages of being easy to attach to a vehicle and easy to remove, but there is a problem in that it is difficult to stably fix the smartphone to the vehicle because the smart ring is easily separated from the fixed position due to vibration of the vehicle.

In addition, since the smart ring is a small ring shape attached to the rear of the smartphone, the position where the smartphone can be fixed in the vehicle is limited, and accordingly, it is difficult to fix the smartphone at a location at a distance suitable for the driver's view.

On the other hand, recently, various methods and devices for wirelessly charging a portable terminal such as a smartphone have been developed. However, when an accessory such as a smart ring or a case is attached to the rear of the smartphone, wireless charging is not performed or the charging efficiency is rapidly reduced. There is a problem with decreasing.

Patent Document 1: Registered Utility Model Publication No. 0404248 (Registered on Dec. 14, 2005) Patent Document 2: Unexamined Patent Publication No. 2017-0053820 (published on May 17, 2017)

An object of the present invention is to provide an accessory for wireless charging that can be conveniently attached to and used in a portable terminal and can improve charging efficiency, and a wireless charging system for a portable terminal including the same.

According to an embodiment of the present invention for achieving the above object, the wireless charging terminal accessory is fixed to the rear surface of the portable terminal to enable wireless charging, the housing having an internal space; a transmitting coil accommodated in the inner space of the housing and generating a magnetic field for magnetic induction wireless charging; and a plurality of electrodes accommodated in the inner space of the housing so as to surround at least a portion of an outer region of the transmitting coil and receiving power supplied to the transmitting coil from the outside; a positive first electrode connected to one of both ends of the transmitting coil and having first and second contact points exposed to the outside in upper and left directions of the housing, respectively; and a negative second electrode connected to the other one of both ends of the transmitting coil and having a third contact and a fourth contact exposed to the outside in the lower and right directions of the housing, respectively.

On the other hand, the wireless charging system according to an embodiment of the present invention is fixed to the rear surface of the portable terminal and generates a magnetic field for magnetic induction wireless charging; and a positive electrode and a negative electrode connected to both ends of the transmitting coil. an electrode; a terminal accessory accommodated in this interior space; and a wireless charging device coupled to the terminal accessory and having a first output electrode and a second output electrode for being electrically connected to the positive electrode and the negative electrode of the terminal accessory, respectively. A first contact point and a second contact point exposed to the outside in the upper and left directions, respectively, are formed on the positive electrode as a single body, and the third contact point and the fourth contact point respectively exposed to the outside in the lower and right directions of the terminal accessory are one. is formed on the cathode electrode as a body of a, and the first output electrode of the wireless charging device is in contact with any one of the first and second contacts, and the second output electrode is in contact with any one of the third and fourth contacts contacted by one

The present invention embeds a transmitting coil in an accessory fixed to the rear surface of the portable terminal so that power is supplied through positive and negative electrodes respectively provided when combined with a wireless charging module, so that the portable terminal can be operated using a magnetic field generated from the terminal accessory. By enabling wireless charging, it is possible to effectively perform wireless charging even when accessories such as a smart ring or a case are mounted on the portable terminal.

According to another embodiment of the present invention, a positive electrode having a first contact point and a second contact point exposed to the outside in upper and left directions, respectively, as a single body, and a third contact point and a fourth contact point exposed to the outside in the lower and right directions, respectively. By providing the terminal accessory with a negative electrode having a contact point formed as a single body, wireless charging is possible regardless of the coupling direction of the terminal.

According to another embodiment of the present invention, an additional device for holding or holding a portable terminal can be coupled to the terminal accessory having the structure as described above, thereby improving user convenience.

1 is a block diagram showing the overall configuration of a wireless charging system according to an embodiment of the present invention.
2 is a side view illustrating a configuration in which a terminal accessory according to an embodiment of the present invention is attached to a portable terminal.
3 to 8 are diagrams for explaining the configurations of a terminal accessory according to an embodiment of the present invention.
9 and 10 are diagrams for explaining the configurations of a wireless charging device according to an embodiment of the present invention.
11 is a perspective view illustrating a configuration for coupling a portable terminal to which a terminal accessory is attached to a wireless charging device according to an embodiment of the present invention.

The following is merely illustrative of the principles of the invention. Therefore, those skilled in the art will be able to devise various devices that, although not explicitly described or shown herein, embody the principles of the present invention and are included within the spirit and scope of the present invention. In addition, all conditional terms and examples listed herein are, in principle, expressly intended only for the purpose of understanding the concept of the present invention, and it should be understood that they are not limited to the specifically enumerated embodiments and states as such. do.

Moreover, it is to be understood that all detailed description reciting the principles, aspects, and embodiments of the invention, as well as specific embodiments, are intended to cover structural and functional equivalents of such matters. Moreover, it is to be understood that such equivalents include not only currently known equivalents, but also equivalents developed in the future, i.e., all devices invented to perform the same function, regardless of structure.

The above objects, features and advantages will become more apparent through the following detailed description in relation to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains can easily implement the technical idea of the present invention. There will be. In addition, in the description of the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a block diagram illustrating the overall configuration of a wireless charging system according to an embodiment of the present invention. The illustrated wireless charging system includes a portable terminal 10 , a terminal accessory 100 and a wireless charging device 200 . can be configured.

Referring to FIG. 1 , a portable terminal 10 is a device such as a smart phone, a PDA, or a tablet PC, and may be a device capable of wireless charging.

For example, the portable terminal 10 has a built-in receiving coil 11 for wireless charging of a magnetic induction method, so that an induced current is generated in the receiving coil 11 by a magnetic field generated in the transmitting coil to charge the battery. can

The terminal accessory 100 is an attachment fixed to the rear surface of the portable terminal 10 , and may be, for example, various structures such as a smart ring, a mobile phone case, a bracket or a clamp.

According to an embodiment of the present invention, the terminal accessory 100 has a built-in transmission coil 101 for generating a magnetic field for wireless charging of a magnetic induction method.

By the magnetic field generated in the transmitting coil 101 built in the terminal accessory 100, electromagnetic induction occurs in the receiving coil 11 built in the portable terminal 10 to generate an induced current, the portable terminal 10 of the battery (not shown) can be charged wirelessly.

On the other hand, the wireless charging device 200 is configured separately from the terminal accessory 100 , and has a structure capable of being combined with the terminal accessory 100 when necessary (eg, during wireless charging).

The wireless charging device 200 may have a circuit unit 201 for supplying power to the transmission coil 101 of the terminal accessory 100 may be built-in.

In addition, as shown in FIG. 1 , the terminal accessory 100 and the wireless charging device 200 may be provided with electrodes 131 and 231 , respectively.

When the terminal accessory 100 and the wireless charging device 200 are combined, the electrodes 131 and 231 are in contact with each other and the transmission coil 101 of the terminal accessory 100 from the circuit unit 201 of the wireless charging device 200 . ) can be supplied with power.

As shown in FIG. 2 , the terminal accessory 100 is attached to the rear surface of the portable terminal 10 using an adhesive member such as double-sided tape, and the transmitting coil 101 is embedded in the terminal accessory 100 to provide a circuit unit 201 . When combined with the built-in wireless charging device 200, power is supplied through the electrodes 131 and 231, so that the portable terminal 10 is wirelessly charged using the magnetic field generated by the terminal accessory 100, Even when the accessory 100 such as a smart ring, a pop socket, or a case is mounted on the terminal 10, wireless charging can be effectively performed.

In addition, according to an embodiment of the present invention, a positive electrode having a first contact and a second contact exposed to the outside in the upper and right directions respectively on the terminal accessory 100 as a single body, and the outside in the lower and right directions, respectively. By providing a negative electrode in which the exposed third contact and fourth contact are formed as one body, the portable terminal 10 to which the terminal accessory 100 is attached is wirelessly charged regardless of the direction in which it is coupled to the wireless charging device 200 . can make this possible.

Hereinafter, configurations of a terminal accessory according to an embodiment of the present invention will be described with reference to FIGS. 3 to 8 .

3 is a view showing a side fixed to the portable terminal 10 among both sides of the terminal accessory 100, the terminal accessory 100 constitutes an exterior and an interior for embedding the transmitting coil 101 and the electrode 131 and a housing 110 having a space.

The housing 110 may include a first case member 111 fixed to the rear surface of the portable terminal 10 , and the first case member 111 may be coupled to the second case member 115 to form an internal space. there is.

In order to attach the terminal accessory 100 to the rear surface of the portable terminal 10 , a double-sided tape may be formed on the first case member 111 of the housing 110 .

On the other hand, a plurality of contacts (141, 142, 151, 152) are exposed on the outer portion of the housing 110, when the terminal accessory 100 is combined with the wireless charging device 200 to the wireless charging device (200) As they come into contact with the provided contacts, they may be electrically connected and power may be supplied from the wireless charging device 200 .

For example, when the terminal accessory 100 has a rectangular shape, as shown in FIG. 3 , a plurality of contacts 141 , 142 , 151 , 152 are upper, left, lower and right sides of the housing 110 . direction can be exposed.

4 and 6 show a state in which the first case member 111 is removed from the terminal accessory 100 , and is for explaining an embodiment of the internal configuration of the terminal accessory 100 .

Referring to FIG. 4 , a transmitting coil 101 generating a magnetic field for magnetic induction wireless charging may be accommodated in the inner space of the housing 110 .

On the other hand, the ferrite sheet 160 is disposed between the second case member 115 and the transmitting coil 101, so that the magnetic field generated in the transmitting coil 101 is directed in the opposite direction toward the portable terminal (10) It can act as a shield.

In addition, as shown in FIG. 5 , the plurality of electrodes 140 and 150 are accommodated in the inner space of the housing 110 to surround at least a portion of the outer region of the transmitting coil 101 , and the plurality of electrodes ( Power supplied to the transmitting coil 101 through 140 and 150 may be applied from the outside.

Here, the first electrode 140 may be electrically connected to the first end 102 , which is any one of both ends of the transmitting coil 101 , and for this purpose, the first electrode 140 of the transmitting coil 101 in the first position A1 . The distal end 102 and the first connecting portion 145 of the first electrode 140 may be connected to each other.

On the other hand, the second electrode 150 may be electrically connected to the second end 103, which is the other one of both ends of the transmitting coil 101, and for this purpose, the second electrode 150 of the transmitting coil 101 at the second position A2. The end 103 and the second connection part 155 of the second electrode 150 may be connected to each other.

For example, the first electrode 140 may be a positive (+) electrode for applying a positive (+) voltage to the first end 102 of the transmitting coil 101 , and may be located on the upper side and the left side of the housing 110 . A first contact point and a second contact point exposed to the outside in each direction may be formed on the first electrode 140 .

On the other hand, the second electrode 150 may be a negative electrode (-) for applying a negative (-) voltage to the second end 103 of the transmitting coil 101, in the lower and right directions of the housing 110. A third contact point and a fourth contact point each exposed to the outside may be formed on the second electrode 150 .

As shown in FIG. 5 , when the housing 110 has a quadrangular shape, the first and second contact points 141 and 142 are the first and second upper and left first and second lines connected to each other among the four outlines of the quadrangle. The third and fourth contacts 151 and 152 are formed on the first electrode 140 so as to correspond to the respective parts, and the lower and right third and fourth lines connected to each other among the four outlines of the quadrangle of the housing 110 . It may be formed on the second electrode 150 so as to correspond to each of them.

According to the configuration of the first and second electrodes 140 and 150 and the positions of the first to fourth contacts 141, 142, 151, and 152 as described above, the plurality of contacts 141, 142, 151, 152) may be exposed in four directions, up, down, left, and right of the terminal accessory 100 .

On the other hand, a plurality of metal members 170 and 175 are provided in a region not surrounded by the first and second electrodes 140 and 150 among the outer regions of the transmitting coil 101 so that a magnetic material such as a magnet is provided. It is possible to facilitate coupling with an external device (eg, the wireless charging device 200 ).

As described above, by exposing the plurality of contacts (141, 142, 151, 152) to the terminal accessory 100 in four directions, the direction of the terminal accessory 100, that is, the terminal accessory 100, is attached to the rear surface. Even if the direction of the portable terminal 10 is changed to the horizontal or vertical direction, the positive first electrode 140 and the negative second electrode 150 are two output electrodes (not shown) formed in the wireless charging device 200 . ) so that they can be contacted and electrically connected.

On the other hand, as shown in Figure 5, by providing the first metal member 170 and the second metal member 175 at the corners in the diagonal direction to each other, the direction of the terminal accessory 100, that is, the terminal accessory 100. Even if the direction of the portable terminal 10 attached to the back is changed, it is attached with a magnet and magnetic force provided in the wireless charging device 200, so that the terminal accessory 100 and the wireless charging device 200 are stably coupled. can

Referring to FIG. 6 , the first electrode 140 has an upper portion in which the first contact 141 is formed in a convex curved shape so as to be exposed in the upper direction of the housing 110 , and the second electrode 140 is exposed in the left direction of the housing 110 . One body including a left side portion in which the contact point 142 is formed in a convex curved shape, and a first connecting portion 143 in an inclined form for connecting the upper portion of the first contact point 141 and the left side portion of the second contact point 142 . may be configured, and a first connecting portion 145 connected to the first end 102 of the transmitting coil 101 may be formed at the end.

In addition, the second electrode 150 has a lower portion in which the third contact 151 is formed in a convex curved shape so as to be exposed in the downward direction of the housing 110 , and the fourth contact 152 is exposed in the right direction of the housing 110 . It will be composed of one body including the right side portion formed in the convex curve shape, the second connection portion 153 of the inclined shape for connecting the lower portion of the third contact point 151 and the right side portion of the fourth contact point 152 . In addition, a second connection part 155 connected to the second end 103 of the transmitting coil 101 may be formed at the end.

According to an embodiment of the present invention, at least one of the first and second electrodes 140 and 150 may be configured as a planar electrode having a height smaller than that of the inner space of the housing 110 .

For example, as shown in FIG. 7 , in order to optimize the shape of the housing and reduce resistance at the same time, the first electrode 140 may be implemented by molding a surface electrode having a height greater than a thickness.

8 shows an embodiment of the configuration of an outer surface that is not attached to the portable terminal 10 among both surfaces of the terminal accessory 100, on the outer surface of the second case member 115, the portable terminal 10 A coupling unit 180 having a structure coupled to an external device for mounting or gripping may be formed.

For example, a smartphone holder such as a smart ring in the form of a ring or a pop socket having a structure that can be contracted/expanded is coupled to the coupling unit 180 of the outer surface of the terminal accessory 100, thereby improving user convenience. .

In addition, various graphics are printed on the outer surface of the second case member 115 to improve the aesthetics of the terminal accessory 100 .

In the above, with reference to FIGS. 3 to 8 , the first and second contacts 141 and 142 formed on the first electrode 140 are exposed in the upper and left directions, respectively, and the third, Although it has been described as an example that the four contacts 151 and 152 are exposed in the lower and right directions, respectively, the exposure directions of the designated contacts are for convenience of explanation, and the exposure directions of the contacts are rotated or rotated by the terminal accessory 100 . It may be designated differently depending on the viewing direction.

For example, when the terminal accessory 100 is viewed from the opposite direction, the first and second contacts 141 and 142 formed on the first electrode 140 are exposed in the upper and right directions, respectively, and the second electrode 150 is exposed in the upper and right directions, respectively. ) formed in the third and fourth contacts (151, 152) are exposed in the lower and left directions, respectively, and the present invention is characterized in that the two contacts are exposed in different directions and consist of an electrode of one body. there may be

The wireless charging device 200 according to an embodiment of the present invention is coupled to the terminal accessory 100 as described above, and is a first for electrically connecting to the positive electrode and the negative electrode provided in the terminal accessory 100 , respectively. By having a first output electrode and a second output electrode, it is possible to apply power supplied to the transmitting coil 101 when combined with the terminal accessory 100 .

Hereinafter, configurations of a wireless charging device according to an embodiment of the present invention will be described with reference to FIGS. 9 and 10 .

Referring to FIG. 9 , the wireless charging device 200 has a groove for inserting and coupling the terminal accessory 100 , and a plurality of electrodes 140 and 150 provided in the terminal accessory 100 are in contact with each other. Output electrodes 241 and 251 may be provided.

For example, in the wireless charging device 200, the upper side is opened and a rectangular groove having a shape and size corresponding to the terminal accessory 100 is formed, and the first output contact 241 and the second The output contact 251 may be exposed and formed.

Accordingly, when the terminal accessory 100 is inserted into the rectangular groove of the wireless charging device 200 , any one of the first and second contacts 141 and 142 formed on the first electrode 140 of the terminal accessory 100 . is in contact with the first output contact 241 of the wireless charging device 200 , the first electrode 140 and the first output electrode 240 are electrically connected, and the second electrode 150 of the terminal accessory 100 Any one of the third and fourth contacts 151 and 152 formed in the wireless charging device 200 is in contact with the second output contact 251 so that the first electrode 140 and the first output electrode 240 are electrically can be connected to

Meanwhile, a cable 260 for receiving power and control signals from an external power supply device may be connected to the wireless charging device 200 .

For example, the cable 260 may serve to electrically connect the circuit unit 201 provided in the wireless charging device 200 and the electrode 231 .

When an embodiment of the internal configuration of the wireless charging device 200 is described in more detail with reference to FIG. 10 , the first output electrode 240 includes a first output contact 241 exposed in the right direction toward the rectangular groove and It consists of one body including a first output electrode connection part 245 connected to any one of the two wires of the cable 260 (eg, a positive (+) wire), and the second output electrode 250 is The second output contact 251 exposed in the left direction toward the rectangular groove and the second output electrode connection 255 connected to any one of the two wires of the cable 260 (eg, the negative (-) wire) It may be composed of one body including.

As shown in FIG. 10 , the shapes of the first and second output contacts 241 and 251 are stably fixed in a state in which the contacts 141 , 142 , 151 , 152 provided in the terminal accessory 100 are in contact. The middle part may be formed in a concave curved shape so that the

On the other hand, one or more magnets are provided in the lower portion of the rectangular groove of the wireless charging device 200 , and are attached to the metal member and magnetic force provided therein when the terminal accessory 100 is inserted into the rectangular groove, the terminal accessory 100 of It is possible to facilitate bonding and at the same time improve bonding stability.

For example, when the terminal accessory 100 is inserted into the groove of the wireless charging device 200, according to the insertion direction, any one of the first and second metal members 170 and 175 provided in the terminal accessory 100 is attached to any one of the first and second magnets 270 and 275 provided in the wireless charging device 200 , the terminal accessory 100 and the wireless charging device 200 may be stably coupled.

11 is a perspective view illustrating a configuration for coupling a portable terminal to which a terminal accessory is attached to a wireless charging device according to an embodiment of the present invention.

Referring to FIG. 11 , after attaching the terminal accessory 100 having the above configuration to the rear surface of the portable terminal 10 , the terminal accessory 100 is inserted into the groove of the wireless charging device 200 . When the 10 is coupled to the wireless charging device 200 , the first and second electrodes 140 , 150 of the terminal accessory 100 are the first and second output electrodes 240 , 250 of the wireless charging device 200 . ) and are electrically connected to each other.

On the other hand, since the plurality of contact points 141 , 142 , 151 , 152 are exposed in four directions in the terminal accessory 100 as described above, the portable terminal 10 is moved only in the vertical direction as shown in FIG. 11 . Even when coupled to the wireless charging device 200 in the horizontal direction, the first and second electrodes 140 and 150 of the terminal accessory 100 and the first and second output electrodes 240 of the wireless charging device 200, 250) may be connected to each other according to each polarity.

In addition, a coupling unit 180 for coupling a separate smartphone holder such as a smart ring or a pop socket to the terminal accessory 100 is formed, and the wireless charging device 200 is coupled with a stand-type or vehicle-fixed holder. A mounting member 280 for the may be formed.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is disclosed in the drawings and in the specification with preferred embodiments. Here, although specific terms have been used, they are only used for the purpose of describing the present invention, and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, it will be understood by those skilled in the art that various modifications and equivalent other embodiments of the present invention are possible therefrom. Accordingly, the true technical scope of the present invention should be defined by the technical spirit of the appended claims.

10: portable terminal 11: receiving coil
100: terminal accessory 101: transmitting coil
102, 103: both ends of the transmission coil 110: housing
111, 115: first, second case member 131: electrode
140, 150: first and second electrodes 141, 142, 151, 152: contact
143, 153: connection part 145, 155: connection part
160: ferrite sheet 170, 175: metal member
180: coupling unit 200: wireless charging device
201: circuit portion 231: electrode
240, 250: first and second output electrodes 241, 251: contact
260: cable 270, 275: magnet
280: mounting member

Claims (13)

In the terminal accessory fixed to the rear surface of the portable terminal to enable wireless charging,
A rectangular-shaped housing having an inner space;
a transmitting coil accommodated in the inner space of the housing and generating a magnetic field for magnetic induction wireless charging; and
A plurality of electrodes accommodated in the inner space of the housing so as to surround at least a portion of the outer region of the transmitting coil, and for receiving power supplied to the transmitting coil from the outside;
The plurality of electrodes
a positive first electrode connected to one of both ends of the transmitting coil and having first and second contact points exposed to the outside in upper and left directions of the housing, respectively; and
a second electrode of a negative electrode connected to the other of both ends of the transmitting coil and having a third contact point and a fourth contact point that are respectively exposed to the lower side and the right side of the housing;
The first and second electrodes are respectively formed at first and second corner portions in a diagonal direction among the four corner portions of the housing, and the first and second electrodes are not formed in a third diagonal direction. A terminal accessory, characterized in that the first metal member and the second metal member are provided at the corner portion and the fourth corner portion, respectively. According to claim 1, wherein the first electrode
an upper portion in which the first contact point is formed in a convex curved shape so as to be exposed in an upper direction of the housing; a left portion in which the second contact point is formed in a convex curved shape to be exposed in a left direction of the housing; and a connecting part of an inclined shape for connecting the upper part and the left part. The terminal accessory comprising a single body. According to claim 1, wherein the second electrode
a lower portion in which the third contact point is formed in a convex curved shape to be exposed in a downward direction of the housing; a right portion in which the fourth contact point is formed in a convex curved shape so as to be exposed in a right direction of the housing; and a connecting part of an inclined shape for connecting the lower part and the right part. The terminal accessory comprising a single body. The method of claim 1, wherein at least one of the first and second electrodes is
Terminal accessory, characterized in that it is composed of a surface-shaped electrode having a height smaller than the inner space of the housing. The method of claim 1,
The housing has a rectangular shape,
The first and second contacts are formed on the first electrode to respectively correspond to the first and second line segments connected to each other among the four outer lines of the housing;
The third and fourth contact points are formed on the second electrode to correspond to third and fourth line segments connected to each other among the four outer lines of the housing, respectively. delete The method of claim 1,
The housing includes a first case member fixed to the rear surface of the portable terminal and a second case member coupled to the first case member to form the inner space,
The terminal accessory further comprising a; a ferrite sheet disposed between the transmitting coil and the second case member. 8. The method of claim 7,
A terminal accessory, characterized in that a coupling portion having a structure coupled to an external device for holding or gripping the portable terminal is formed on the outer surface of the second case member. A transmitting coil fixed to the rear surface of the portable terminal and generating a magnetic field for wireless charging in a magnetic induction method; and positive and negative electrodes connected to both ends of the transmitting coil; a terminal accessory having a rectangular shape accommodated in the inner space; and
A wireless charging device coupled to the terminal accessory and having a first output electrode and a second output electrode for being electrically connected to the positive electrode and the negative electrode of the terminal accessory, respectively;
A first contact point and a second contact point exposed to the outside in the upper and left directions of the terminal accessory, respectively, are formed on the positive electrode as a single body,
A third contact point and a fourth contact point exposed to the outside in the lower and right directions of the terminal accessory, respectively, are formed on the negative electrode as a single body,
The first output electrode of the wireless charging device is in contact with any one of the first and second contacts, and the second output electrode is in contact with any one of the third and fourth contacts,
The positive electrode and the negative electrode are respectively formed in a first corner portion and a second corner portion in a diagonal direction among the four corner portions of the terminal accessory, and the positive electrode and the negative electrode are not formed in a diagonal direction to each other A wireless charging system, characterized in that the first metal member and the second metal member are respectively provided on the third corner portion and the fourth corner portion. delete 10. The method of claim 9,
The housing of the terminal accessory includes a first case member fixed to the rear surface of the portable terminal and a second case member coupled to the first case member to form the inner space,
A wireless charging system, characterized in that; a ferrite sheet is disposed between the transmitting coil and the second case member. 12. The method of claim 11,
A wireless charging system, characterized in that a coupling portion having a structure coupled to an external device for holding or holding a portable terminal is formed on an outer surface of the second case member. The method of claim 9, wherein the wireless charging device
A rectangular groove for inserting the terminal accessory is formed,
The upper side of the rectangular groove is open, the lower side is provided with one or more magnets, the left and right wireless charging system, characterized in that the first output electrode and the second output electrode are provided, respectively.

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