KR20070080057A - Contact-less charger system having heat-dissipating means and charging unit thereof - Google Patents

Abstract

A contact-less charger system having a heat-dissipating means and a charging unit thereof are provided to reduce heat conducted from a charging unit to a unit to be charged by dissipating heat generated in a feeding coil to the outside. A contact-less charger system comprises a charging unit(100) and a unit to be charged(200). The charging unit includes a feeding coil(101) generating magnetic flux during power supply, and a heat spreader(102) dissipating heat generated in the feeding coil. The unit is charged by being placed on the charging unit and includes a receiving coil(202) generating inductive electromotive force by inductive coupling with the feeding coil and, and a secondary battery part charging the inductive electromotive force.

Description

Contactless charging system having a heat-dissipating means and a charging unit therefor {Contact-less charger system having heat-dissipating means and charging unit

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to

1 is an exploded perspective view showing the configuration of a general contactless charging system.

Figure 2 is an exploded perspective view showing the configuration of a contactless charging system according to a first embodiment of the present invention.

3 is a cross-sectional view illustrating a configuration of a heat spreader in FIG. 2.

4 and 5 are side views schematically showing an example of the arrangement of the heat dissipation means of FIG.

6 is an exploded perspective view showing the configuration of a contactless charging system according to a second embodiment of the present invention.

7 is a cross-sectional view of FIG. 6.

8 is a cross-sectional view illustrating a structure of a microcapsule constituting the heat dissipation sheet of FIG. 6.

<Description of main reference numerals in the drawings>

100,100 ': charging unit 101: feed coil

102: heat spreader 105: heat sink

106: fan 108: pad

109: heat dissipation sheet 200: unit to be charged

201: body case 202: faucet coil

300: thermally conductive material 301: polymer material layer

The present invention relates to a contactless charging system for charging a charged unit by a wireless charging method, and more particularly, to a contactless charging system having a means for dissipating heat generated from a feed coil of a charging unit to the outside. It is about.

In general, portable electronic devices such as mobile communication terminals and PDAs are equipped with a battery having a rechargeable secondary battery to provide power. In order to charge the secondary battery, a separate charging device for supplying portable electronic devices by adjusting the home commercial power to an appropriate voltage is required. In general, the charging device and the battery are provided with separate contact terminals, respectively, so as to electrically connect the charging device and the battery by connecting the two contact terminals with each other.

However, when the contact terminal protrudes to the outside as described above, there is a problem that the contact state is not good and the contact terminal is contaminated with external foreign matters so that the contact state is easily poor. In addition, when the battery is inadvertently shorted or exposed to moisture, the charging energy may be easily lost.

In order to solve the problem of the contact charging method, as shown in FIG. 1, the charging device 10 having the primary coil (feeding coil) 11 and the secondary coil (hydraulic coil) 21 are A contactless charging system for charging a battery in a non-contact manner by using an inductive coupling between the provided battery 20 has been proposed. As related technologies, Republic of Korea Patent Publication No. 2002-57468, Republic of Korea Patent Publication No. 2002-57469, Republic of Korea Patent Publication No. 428,713, Republic of Korea Patent Publication No. 2002-35242, United States Patent Publication No. 2003 / 0,210,106 And the non-contact charging system disclosed in the call.

In the contactless charging system as described above, heat is generated by a current flowing in the primary coil 11 of the charging device 10, and the heat is conducted to the battery mounted on the charging device 10 to extend the life of the battery. Since it may shorten or reduce the charging efficiency, a countermeasure is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is a contactless charging having heat dissipation means capable of reducing heat conducted from the charging unit to the charged unit by releasing heat generated from the feed coil to the outside. It is an object to provide a system and its charging unit.

Another object of the present invention is to provide a contactless charging system having a heat dissipation means which can be manufactured thin so as to minimize the volume increase of the charging unit, and a charging unit thereof.

In order to achieve the above technical problem, the contactless charging system according to the present invention includes a heat dissipation means having a structure for supporting the power supply coil and releasing heat generated from the power supply coil to the outside.

That is, the contactless charging system according to the present invention, a power supply coil for generating a magnetic flux when the power supply; And a heat dissipation means for dissipating heat generated from the power supply coil to the outside; a power receiving coil generating induction electromotive force by inductive coupling with the power supply coil, the charging unit mounted on the charging unit and wirelessly charged; And a secondary battery unit configured to charge the induced electromotive force.

The heat dissipation means may include a thermally conductive plate-shaped case having an upper surface in contact with the feeding coil and having a refrigerant in the inner space; And a mesh layer installed inside the plate-shaped case and having wires alternately crossing each other up and down, and a woven mesh layer stacked thereon.

Preferably, the mesh layer of the heat spreader has a structure in which a coarse mesh is interposed between two dense meshes.

The heat dissipation means may further include a heat sink attached to the lower surface of the plate-shaped case of the heat spreader.

Preferably, the charging unit may further include a fan for blowing heat to the outside.

Alternatively, the heat dissipation means has a heat dissipation sheet formed by including a thermally conductive filler.

The charging unit further includes a pad having a support surface on which the unit to be charged may be mounted, wherein the feeding coil and the heat dissipation sheet are preferably installed in the pad.

The body case of the unit to be charged is preferably an injection molding containing a thermally conductive filler.

Preferably, as the thermally conductive filler, any one or two or more thermally conductive materials selected from aluminum oxide, aluminum hydroxide, natural black salt, and phase transition materials may be employed.

Preferably, the thermally conductive filler has a microencapsulated structure so as to surround the thermally conductive material with a polymer material layer.

According to another aspect of the present invention, a charging unit of a contactless charging system for wirelessly charging a charged unit, the charging unit comprising: a feeding coil for providing a magnetic flux capable of generating induced electromotive force on the receiving coil of the charged unit when power is supplied; And a heat dissipation means for dissipating heat generated from the power supply coil to the outside.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

2 is an exploded perspective view showing the configuration of a contactless charging system according to a first embodiment of the present invention.

2, a contactless charging system according to a first embodiment of the present invention includes a charging unit 100 having a feed coil 101 and a plate heat spreader 102, and a charging unit ( And a charging unit 200 having a power receiving coil 202, which is mounted on 100 to receive power in a contactless manner.

The charging unit 100 includes a feed coil 101 generating a magnetic flux for wireless charging, and a heat spreader 102 disposed under the feed coil 101 to provide a heat dissipation function.

The power supply coil 101 has a structure in which a coil wire is wound so as to generate a magnetic flux capable of charging the charged unit 200 during power supply. Here, the winding pattern of the feed coil 101 is not limited to a substantially quadrangular as shown in the figure can be variously modified in a circle, oval or the like.

The heat spreader 102 shown in FIG. 3 includes a thermally conductive plate-shaped case 103 in which a coolant is received, the upper surface of which is in thermal contact with the feed coil 101, and an inner space of the plate-shaped case 103. A mesh layer 104 is provided to provide a flow path of the gaseous refrigerant. The technical configuration and operation of the heat spreader 102 is disclosed in Korean Patent Application Laid-Open No. 2005-0032888, Korean Patent Application Laid-Open No. 2005-51530, and so on, detailed description thereof will be omitted.

In order to more efficiently provide the flow path of the liquid refrigerant and the diffusion path of the gaseous refrigerant, the mesh layer 104 has a lamination structure having a coarse mesh 104b interposed between two dense meshes 104a and 104c. It is preferable.

In addition, a heat sink 105 is attached to the bottom surface of the plate-shaped case 103 of the heat spreader 102 to dissipate heat transferred by the heat spreader 102 into the air.

In addition, a fan 106 is attached to the charging unit 100 so as to blow heat generated from the power supply coil 101 to the outside. Here, the fan 106 may be installed to contact the sides of the feed coil 101, the heat spreader 102 and the heat sink 105, as shown in Figure 4, the heat sink as shown in FIG. The upper surface of the 105 may be provided to contact the side of the feed coil 101 and the heat spreader 102.

The unit to be charged 200 includes a power receiving coil 202 for generating induced electromotive force, a secondary battery unit (not shown) for charging the induced electromotive force, and a body case 201 for receiving the receiving coil 202 and the secondary battery unit. Equipped. The body of the charged unit 200 preferably corresponds to a battery used in a mobile communication terminal such as a mobile phone, or may correspond to the mobile communication terminal itself in a state where the battery is mounted.

The power receiving coil 202 generates induction electromotive force by inductive coupling with the power supply coil 101, and the induced electromotive force is charged in the secondary battery unit including a conventional protection circuit or a power supply adjustment circuit.

As described above, the heat dissipation means including the heat spreader 102, the heat sink 105, and the fan 106 contacts the predetermined charging circuit 107 and the power supply coil 101 as shown in FIGS. 4 and 5. To dissipate heat to the outside. That is, during the wireless charging operation performed while the charged unit 200 is placed on the charging unit 100, heat generated from the charging circuit 107 and the feeding coil 101 is diffused by the heat spreader 102. Overconversion is promoted and released to the outside through the heatsink 105 and the fan 106. In particular, the heat transferred into the plate case 103 of the heat spreader 102 evaporates the refrigerant, and the refrigerant in the gas phase is condensed near the heat sink 105 or the fan 106 corresponding to the heat dissipation unit. This thermal action is further activated by the mesh layer 104 installed in the plate-shaped case 103 to provide a flow path of the refrigerant and a diffusion path of the gaseous refrigerant.

6 is an exploded perspective view showing the configuration of a contactless charging system according to a second embodiment of the present invention.

Referring to FIG. 6, a contactless charging system according to a second embodiment of the present invention may include a charging unit 100 ′ having a feed coil 101 and a heat dissipation sheet 109, and a charging unit 100 ′. It includes a unit to be charged 200 having a faucet coil 202, which is lifted to receive power in a contactless manner.

The charging unit 100 includes a pad 108 having a predetermined shape, a heat dissipation sheet 109 mounted on the pad 108, and a feed coil 101 installed on the heat dissipation sheet 109.

The pad 108 may have any shape as long as it provides a supporting surface on which the unit to be charged 200 can be seated. Preferably, the recess 108a is provided on the upper surface of the pad 108 so that the heat dissipation sheet 109 and the feed coil 101 may be sequentially stacked and embedded. In this case, the concave portion 108a is formed to a depth such that the upper surface of the embedding feed coil 101 as shown in Figure 7 can be located on substantially the same plane as the upper surface of the pad 108. desirable.

The heat dissipation sheet 109 is mounted on the recess 108a of the pad 108, and is disposed below the feed coil 101 to mediate heat generated from the feed coil 101 to be more quickly transmitted to the outside. Do this. The heat dissipation sheet 109 is manufactured to include a thermally conductive filler, and the sheet manufacturing process itself may adopt various known sheet processing techniques.

As the thermally conductive filler constituting the heat dissipation sheet 109, any one or two or more thermally conductive materials (see 300 in FIG. 8) selected from aluminum oxide, aluminum hydroxide, natural black salt, and phase change material (PCM) are employed. It is preferable. The thermally conductive material 300 is preferably processed into a microcapsule structure that is surrounded by the polymer material layer 301 and maintains a particle shape as shown in FIG. 8. That is, the heat dissipation sheet 109 is preferably sheet processed by a thermally conductive filler having a microencapsulated structure.

The power supply coil 101 is installed on the heat dissipation sheet 109 to generate magnetic flux when power is supplied. Here, the winding pattern of the feed coil 101 is not limited to a substantially quadrangular as shown in the figure can be variously modified in a circle, oval or the like.

The unit to be charged 200 includes a power receiving coil 202 for generating an induced electromotive force, a secondary battery unit for charging the induced electromotive force, and a body case 201 for receiving the receiving coil 202 and the secondary battery unit. The body of the charged unit 200 preferably corresponds to a battery used in a mobile communication terminal such as a mobile phone, or may correspond to the mobile communication terminal itself in a state where the battery is mounted.

The secondary battery unit is housed inside the body case 201 of the unit to be charged, and the body case 201 is a thermally conductive filler or polymer as described above to more effectively suppress the temperature rise of the secondary battery unit. It is preferable that the thermally conductive material 300 is composed of an injection-molded material including a thermally conductive filler having a microencapsulated structure by the material layer 301. Here, the injection process itself for forming the body case 201 may adopt various known injection techniques.

The power receiving coil 202 generates induction electromotive force by inductive coupling with the power supply coil 101, and the induced electromotive force is charged in the secondary battery unit including a conventional protection circuit or a power supply adjustment circuit.

As described above, the charging unit 100 of the contactless charging system according to the preferred embodiment of the present invention is provided with a heat dissipation sheet 109 to externally generate heat generated by the power supply coil 101 with higher performance than in the related art. By discharging to prevent the unit to be charged 200 is heated.

That is, since the heat dissipation sheet 109 formed including the thermal conductive filler is disposed under the power supply coil 101 of the charging unit 100, Joule heat generated in correspondence with the power supply to the power supply coil 101 is a heat dissipation sheet ( 109 is quickly delivered to the pad 108 body and then radiated into the air.

On the other hand, the charged unit 200 mounted on the support surface of the pad 108 of the charging unit 100 has the power receiving coil 202 and the induced electromotive force which generate the induced electromotive force by the inductive coupling with the feed coil 101. A secondary battery unit for charging is provided, and in particular, the body case 201 for storing them is formed of an injection molding including a thermally conductive filler, so that Joule heat generated in the faucet coil 202 or residual heat conducted from the charging unit is retained. By emitting to the outside with a higher performance it is possible to suppress the decrease in the charging efficiency of the secondary battery unit due to the temperature rise.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

According to the present invention, since the heat generated from the feed coil can be discharged to the outside with higher performance, the charging efficiency can be suppressed from being lowered by the heat conducted from the charging unit to the charged unit.

In particular, according to the first embodiment of the present invention, by adopting a plate heat spreader as the heat dissipation means, the heat of the feed coil can be efficiently cooled in a thin structure.

In addition, according to the second embodiment of the present invention, since the heat dissipation sheet is configured using the microencapsulated heat conductive filler, the heat dissipation sheet may be structurally more stable and provide high heat dissipation performance even at a thin thickness.

Further, according to the present invention, since the body case of the unit to be charged is composed of an injection molding including a thermally conductive filler, there is an advantage of more effectively preventing the temperature rise of the secondary battery.

Claims (19)

A power supply coil generating magnetic flux upon power supply; And a heat dissipation means for dissipating heat generated from the feed coil to the outside. A power receiving coil which is placed on the charging unit and wirelessly charged to generate induced electromotive force by the inductive coupling with the feeding coil; And a secondary battery unit configured to charge the induction electromotive force. The method of claim 1, The heat dissipation means, An upper surface is disposed to contact the feed coil, and an inner space includes a thermally conductive plate-shaped case containing a refrigerant; And And a heat spreader installed inside the plate-shaped case and including a mesh layer in which wires are alternately crossed up and down and woven meshes are stacked. The method of claim 2, And the mesh layer has a structure in which coarse mesh is interposed between two dense meshes. The method of claim 2, The heat dissipation means, And a heat sink attached to the bottom surface of the plate-shaped case of the heat spreader. The method according to claim 1 or 4, The heat dissipation means, Contactless charging system comprising a; fan for blowing heat to the outside. The method of claim 1, The heat dissipation means is a contactless charging system, characterized in that the heat radiation sheet formed by including a thermally conductive filler. The method of claim 6, The charging unit further includes a pad having a support surface on which the unit to be charged may be seated. Solid-state charging system, characterized in that the feed coil and the heat dissipation sheet is installed in the pad. The method of claim 6, The body case of the unit to be charged is a contactless charging system, characterized in that the injection containing a thermally conductive filler. The method according to claim 6 or 8, The thermally conductive filler is a contactless charging system, characterized in that any one or two or more thermally conductive materials selected from aluminum oxide, aluminum hydroxide, natural black salt and phase transition materials are employed. The method of claim 9, And the thermally conductive filler is microencapsulated in a structure in which the thermally conductive material is surrounded by a polymer material layer. A charging unit of a contactless charging system for wirelessly charging a charged unit, A feeding coil providing a magnetic flux capable of generating induced electromotive force in the receiving coil of the charged unit when power is supplied; And And a heat dissipation means for dissipating heat generated from the power supply coil to the outside. The method of claim 11, The heat dissipation means, An upper surface is disposed to contact the feed coil, and an inner space includes a thermally conductive plate-shaped case containing a refrigerant; And And a heat spreader installed inside the plate-shaped case, the mesh layer including wires alternately crossing up and down, and woven meshes stacked. The method of claim 12, The mesh layer has a structure in which a coarse mesh is interposed between two dense meshes. The method of claim 12, The heat dissipation means, And a heat sink attached to a bottom surface of the plate-shaped case of the heat spreader. The method according to claim 11 or 14, The heat dissipation means, Charging unit comprising a; fan for blowing heat to the outside. The method of claim 11, The heat dissipation means is a charging unit, characterized in that the heat dissipation sheet formed by including a thermally conductive filler. The method of claim 16, And a pad having a support surface on which the unit to be charged can be seated. The charging unit, characterized in that the feed coil and the heat radiation sheet is installed in the pad. The method of claim 16, The thermally conductive filler is a charging unit, characterized in that any one or two or more thermally conductive materials selected from aluminum oxide, aluminum hydroxide, natural black salt, and a phase change material are employed. The method of claim 18, And the thermally conductive filler is microencapsulated in a structure in which the thermally conductive material is surrounded by a polymer material layer.

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