KR20160057247A - Wireless power transmitting apparatus for wireless charging - Google Patents

Wireless power transmitting apparatus for wireless charging Download PDF

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Publication number
KR20160057247A
KR20160057247A KR1020140158272A KR20140158272A KR20160057247A KR 20160057247 A KR20160057247 A KR 20160057247A KR 1020140158272 A KR1020140158272 A KR 1020140158272A KR 20140158272 A KR20140158272 A KR 20140158272A KR 20160057247 A KR20160057247 A KR 20160057247A
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KR
South Korea
Prior art keywords
wireless power
coil
housing
heat
transmission
Prior art date
Application number
KR1020140158272A
Other languages
Korean (ko)
Inventor
이정은
이희정
염재훈
윤형
배석
Original Assignee
엘지이노텍 주식회사
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Priority to KR1020140158272A priority Critical patent/KR20160057247A/en
Publication of KR20160057247A publication Critical patent/KR20160057247A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20136—Forced ventilation, e.g. by fans
    • H05K7/20172—Fan mounting or fan specifications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20209—Thermal management, e.g. fan control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20409—Outer radiating structures on heat dissipating housings, e.g. fins integrated with the housing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
    • H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
    • H05K7/20472—Sheet interfaces

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

According to an embodiment of the present invention, a wireless power transmitting apparatus for wireless charging comprises: a transmitting module comprising a shielding layer and a transmitting coil wound in parallel with a plane of the shielding layer and formed on the shielding layer; and a housing which accommodates the transmitting modules, and has at least one hole.

Description

[0001] WIRELESS POWER TRANSMITTING APPARATUS FOR WIRELESS CHARGING [0002]

The present invention relates to wireless charging, and more particularly, to a wireless power transmission device for wireless charging.

Background Art [0002] With the development of wireless communication technology, there is a growing interest in wireless power transmission / reception technology for wirelessly supplying electric power to electronic devices. Such wireless power transmission / reception technology can be applied not only to battery charging of a portable terminal, but also to power supply for household electric appliances, power supply to electric vehicles and subways.

Typical wireless power transmission and reception techniques utilize the principles of magnetic induction or self-resonance. For example, when electrical energy is applied to a transmission antenna of a wireless power transmission device, the transmission antenna can convert electrical energy into electromagnetic energy and radiate it to the surroundings. The receiving antenna of the wireless power receiving apparatus can receive the electromagnetic energy radiated from the transmitting antenna and convert it into electric energy.

At this time, a considerable amount of heat may be generated in the receiving coil, the soft magnetic sheet and the battery of the wireless power receiving apparatus, as well as the circuit portion, the transmitting coil and the soft magnetic core of the wireless power transmitting apparatus. Such a heat not only degrades the performance and life of parts included in the wireless power transmitting / receiving device, but also may cause a low temperature image. Therefore, it is necessary to efficiently diffuse or emit heat generated inside the wireless power transmitting / receiving device.

SUMMARY OF THE INVENTION The present invention provides a wireless power transmission apparatus for wireless charging.

A wireless power transmission apparatus for wireless charging according to an embodiment of the present invention includes a transmission module including a shielding layer and a transmission coil wound on the shielding layer in parallel with a plane of the shielding layer and formed on the shielding layer, And a housing having at least one hole formed therein.

The holes may be formed on both sidewalls of the surface where the wireless power receiving device contacts during wireless charging.

And a heat dissipation fan or a heat dissipation fin received in the housing and configured to dissipate heat generated from the transmission module.

And a heat conduction sheet formed on an inner wall of the housing for diffusing heat generated from the transmission module.

The thermally conductive sheet may be disposed opposite to the transmission coil.

The thermally conductive sheet may be disposed corresponding to an area where the receiving coil of the wireless power receiving apparatus is located during wireless charging.

A concavo-convex structure may be formed on the surface of the heat conduction sheet.

The housing comprises a resin composition comprising a binder and a filler, wherein the filler may be selected from the group consisting of boron nitride and diamond.

At least one surface of the inner wall of the housing may have a concave-convex structure.

According to the embodiment of the present invention, heat generated during wireless charging can be efficiently diffused. As a result, the performance and reliability of the component can be maintained, and a low temperature image of the user can be prevented.

Figure 1 shows a wireless charging system in accordance with an embodiment of the present invention.
2 is a diagram illustrating a wireless power transmission / reception method of a wireless charging system according to an embodiment of the present invention.
3 shows an equivalent circuit diagram of a transmission coil according to an embodiment of the present invention.
4 is an equivalent circuit diagram of a power supply and a wireless power transmission apparatus according to an embodiment of the present invention.
5 is an equivalent circuit diagram of a wireless power receiving apparatus according to an embodiment of the present invention.
6 is a top view of a soft magnetic layer and a transmission coil included in a wireless power transmission apparatus according to an embodiment of the present invention.
7 is a top view of a soft magnetic layer and a receiving coil included in a wireless power receiving apparatus according to an embodiment of the present invention.
8 is a cross-sectional view of a wireless power transmission apparatus and a wireless power reception apparatus according to an embodiment of the present invention.
9 to 13 are cross-sectional views of a wireless power transmission apparatus and a wireless power reception apparatus according to another embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

Figure 1 shows a wireless charging system in accordance with an embodiment of the present invention.

Referring to FIG. 1, a wireless charging system 10 includes a power source 100, a wireless power transmission device 200, a wireless power receiving device 300, and an access terminal 400.

The wireless power transmission apparatus 200 is connected to the power source 100 and receives power from the power source 100. [ Then, the wireless power transmission apparatus 200 transmits power wirelessly to the wireless power reception apparatus 300. At this time, the wireless power transmitting apparatus 200 can transmit power using electromagnetic induction. The power supply 100 and the wireless power transmitting apparatus 200 are illustrated as being separate components, but the present invention is not limited thereto. The power supply 100 may be included in the wireless power transmission apparatus 200.

The wireless power receiving apparatus 300 wirelessly receives power from the wireless power transmitting apparatus 200 using an electromagnetic induction method. Then, the wireless power receiving apparatus 300 supplies the received power to the load terminal 400. Although the wireless power receiving apparatus 300 and the loading station 400 are illustrated as separate components, the present invention is not limited thereto. The lower stage 400 may be included in the wireless power receiving apparatus 300.

2 is a diagram illustrating a wireless power transmission / reception method of a wireless charging system according to an embodiment of the present invention.

Referring to FIG. 2, the wireless power transmission apparatus 200 may include a transmission coil 210. The wireless power receiving apparatus 300 may include a receiving coil 310 and a rectifying unit 320.

The power source 100 may generate and supply AC power having a predetermined frequency to the transmission coil 210 of the wireless power transmission apparatus 200.

The AC current generated by the transmission coil 210 may be transmitted to the reception coil 310 inductively coupled to the transmission coil 210.

The electric power transmitted to the receiving coil 310 using the electromagnetic induction method may be rectified through the rectifying unit 320 and transmitted to the loading stage 400. [

3 shows an equivalent circuit diagram of a transmission coil according to an embodiment of the present invention.

3, the transmission coil 210 includes an inductor L1 and a capacitor C1, and both ends of the inductor L1 may be connected to both ends of the capacitor C1.

Here, the capacitor C1 may be a variable capacitor, and the impedance matching may be performed as the capacitance of the capacitor C1 is adjusted. The equivalent circuit diagram of the receiving coil 310 may be similar to the equivalent circuit diagram of the transmitting coil 210, but is not limited thereto.

4 is an equivalent circuit diagram of a power supply and a wireless power transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the transmission coil 210 may include an inductor L1 and a capacitor C1 having an inductance value and a capacitance value.

5 is an equivalent circuit diagram of a wireless power receiving apparatus according to an embodiment of the present invention.

5, the receiving coil 310 may include an inductor L2 and a capacitor C2 having an inductance value and a capacitance value.

The rectifying unit 320 converts AC power received from the receiving coil 310 into DC power and transmits the converted DC power to the receiving terminal 400.

Specifically, the rectification section 320 may include a rectifier and a smoothing circuit although not shown. The rectifier may be, for example, a silicon rectifier and may be equalized with a diode D1, but is not limited thereto. The rectifier can convert the AC power received from the receiving coil 310 into DC power. The smoothing circuit can output smooth DC power by removing the AC component included in the DC power converted in the rectifier. The smoothing circuit may be, for example, equivalent to capacitor C3, but is not limited thereto.

The lower stage 400 may be a battery or a device with a built-in battery.

On the other hand, quality factor and coupling coefficient have important meaning in wireless power transmission. The quality factor (Q) is an index of energy that can be accumulated in the vicinity of the wireless power transmission apparatus 200 or the wireless power reception apparatus 300. The quality index may vary depending on the operating frequency (w), the shape of the coil, the dimensions, the material, and the like, and can be expressed by the following equation (1).

[Equation 1]

Q = w * Ls / Rs

Here, Ls is the inductance of the coil, and Rs is the resistance corresponding to the amount of power loss occurring in the coil itself.

The quality index can have a value from 0 to infinity and the higher the quality index, the higher the power transmission efficiency between the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 can be.

The coupling coefficient means a degree of magnetic coupling between the transmitting coil and the receiving coil, and ranges from 0 to 1. The coupling coefficient may vary depending on the relative position or distance of the transmitting coil and the receiving coil.

FIG. 6 is a top view of a soft magnetic layer and a transmission coil included in a wireless power transmission apparatus according to an embodiment of the present invention, and FIG. 7 is a diagram illustrating a soft magnetic layer and a reception Is a top view of the coil.

6, the wireless power transmission apparatus 600 includes a transmission circuit (not shown), a soft magnetic core 610, a transmission coil 620, and a permanent magnet 630.

The soft magnetic core 610 may be made of a soft magnetic material having a thickness of several mm. Then, a transmission coil 620 wound on the soft magnetic core 610 in parallel with the plane of the soft magnetic core 610 may be formed. The permanent magnet 630 may be surrounded by the transmission coil 620. The permanent magnets 630 may be omitted according to specifications. The soft magnetic core 610 shields electromagnetic waves generated from the transmission coil. Accordingly, in this specification, the soft magnetic core 610 can be mixed with the shielding layer.

7, the wireless power receiving apparatus 700 includes a receiving circuit (not shown), a soft magnetic layer 710, and a receiving coil 720. [ The soft magnetic layer 710 may be formed on a substrate (not shown). The substrate may be composed of a plurality of fixed sheets and bonded to the soft magnetic layer 710 to fix the soft magnetic layer 710.

The soft magnetic layer 710 concentrates the electromagnetic energy radiated from the transmitting antenna 720 of the wireless power transmitting apparatus 700.

The soft magnetic layer 710 may be formed of a metal material or a ferrite material and the soft magnetic layer 710 may be formed of various types of materials such as a sintered body (pellet), a plate, a ribbon, a foil, . ≪ / RTI > For example, the soft magnetic layer 710 may be a stack of a plurality of sheets including a soft magnetic metal powder or alloy powder (hereinafter referred to as a soft magnetic metal powder) and a polymer resin. As another example, the soft magnetic layer 710 may be an alloy ribbon, laminated ribbon, foil or film comprising at least one of Fe, Co, and Ni. As another example, the soft magnetic layer 710 may be a composite containing 90 wt% or more of FeSiCr flakes and 10 wt% or less of the polymer resin. As another example, the soft magnetic layer 710 may be a sheet, ribbon, foil or film comprising Ni-Zn ferrite.

On the soft magnetic layer 710, a receiving coil 720 is formed. The receiving coil 720 may be wound on the soft magnetic layer 710 in a direction parallel to the plane of the soft magnetic layer 710. [ For example, a receiving coil applied to a smart phone may be in the form of a spiral coil having an outer diameter of 50 mm or less and an inner diameter of 20 mm or more. The receiving circuit converts the electromagnetic energy received through the receiving coil 720 into electric energy, and charges the battery (not shown) with the converted electric energy.

On the other hand, when the wireless power receiving apparatus 700 has both the WPC function and the NFC function, the NFC coil 730 may be further stacked on the soft magnetic layer 710. The NFC coil 730 may be formed so as to surround the outside of the receiving coil 720.

The receiving coil 720 and the NFC coil 730 may be electrically connected to each other through a terminal 740.

8 is a cross-sectional view of a wireless power transmission apparatus and a wireless power reception apparatus according to an embodiment of the present invention, and FIGS. 9 to 13 are sectional views of a wireless power transmission apparatus and a wireless power reception apparatus according to another embodiment of the present invention .

8 to 13, the wireless power transmission apparatus 800 can transmit power wirelessly to the wireless power reception apparatus 900 using an electromagnetic induction method. For wireless charging, the wireless power receiving device 900 may be placed in contact with the surface of the wireless power transmitting device 800.

A wireless power transmitter 800 includes a transmitter module 810 and a housing 820. The transmitting module 810 may include a shielding layer 812 and a transmitting coil 814 formed on the shielding layer 812. Here, the shielding layer may be the soft magnetic core 610 of FIG. 6 and the transmit coil may be the transmit coil 620 of FIG. The transmission module 810 may further include a circuit unit 816 for controlling the current applied to the transmission coil 814. [ For example, the circuit portion 816 may be formed below the transmit coil 814 and the shield layer 812 and may be coupled to the transmit coil 814. Alternatively, the circuit portion 816 may be disposed on the sides of the transmitting coil 814 and the shielding layer 812. [

Housing 820 receives transmit module 810. The housing 820 may include, for example, a plastic material or a metal material.

The wireless power receiving apparatus 900 includes a receiving module 910, a battery 920, and a housing 930. The wireless power receiving apparatus 900 may further include a user interface unit 940 such as a keypad and a touchpad and a printed circuit board 950 on which various electronic components are mounted. The receiving module 910 may include a shielding layer 912 and a receiving coil 914 formed on the shielding layer 912. Here, the shielding layer 912 may be the soft magnetic layer 710 of FIG. 7, and the receiving coil 914 may be the receiving coil 720 of FIG. The receiving module 910 may further include a circuit unit 916 that converts and controls the electromagnetic energy of the receiving coil 914 into electric energy.

On the other hand, in the case of wireless charging, heat may be generated in the wireless power transmission apparatus 800 or the wireless power reception apparatus 900. For example, the amount of heat generated by the circuit portions 816 and 916 of the wireless power transmitting / receiving devices 800 and 900 may increase with the transmission power. Heat may be generated in the transmission coil 814 and the reception coil 914 due to the eddy current loss, and heat may also be generated in the shield layers 812 and 912 due to magnetic hysteresis loss, eddy current loss, residual loss, and the like. In addition, the battery 920 of the wireless power receiving apparatus 900 may generate heat due to the eddy current loss of the case.

 In this case, the amount of heat generation can be reduced by increasing the thickness of the transmitting coil 814 and the receiving coil 914, or by shielding the alternating magnetic field leaking from the case of the battery 920, The temperature can be lowered by attaching the heat diffusion sheet to one side of the heat dissipating unit 912. However, even in the case of using such a method, the surface temperature of the wireless power transmitting apparatus sometimes increases to 50 ° C or more at the time of wireless charging of 5W or more.

Accordingly, in one embodiment of the present invention, at least one hole 822 is formed in the housing 820 of the wireless power transmission apparatus 800. Heat generated within the wireless power transmission device 800 may be radiated to the outside through the holes 822, so that the temperature of the wireless power transmission device 800 may be lowered.

According to one embodiment of the present invention, the holes 822 may be formed in both sidewalls of the side where the wireless power receiving device 900 contacts during wireless charging. The heat generated in the area where the transmission coil 814 and the reception coil 914 meet can be efficiently discharged through the holes 822 formed in both side walls of the housing 820 and the wireless power transmission device 800 Can be prevented from being excessively increased.

9, the wireless power transmission device 800 further includes at least one of a fan 830 and a heat dissipation pin 840 for emitting heat generated from the transmission module 810 You may. The heat dissipation fan 830 and the heat dissipation fin 840 can effectively transmit the heat generated in the vicinity of the transmission module 810 in the direction of the hole 822 formed in the side wall of the housing 820. [ To this end, a component (not shown) for supplying power to the heat-dissipating fan 830 may be further included. The heat dissipation fins 840 may be a metal having a high thermal conductivity whose surface is insulated. The heat generated inside the wireless power transmission apparatus 800 can be discharged through the holes 822 formed in the periphery of the heat dissipation fan 830 and the heat dissipation fin 840 and the heat generated in the other holes 822, < / RTI >

 10, a heat conductive sheet 850 may be further formed on the inner wall of the housing 820 of the wireless power transmission apparatus 800 according to an embodiment of the present invention. The heat conductive sheet 850 may be disposed on a surface facing the transmission coil 814. [ That is, the heat conduction sheet 850 may be disposed corresponding to an area where the receiving coil 914 of the wireless power receiving apparatus 900 is located during wireless charging. At this time, the heat conduction sheet 850 may be formed larger than the area of the transmission coil 814. For example, the distance from the center to the edge of the thermally conductive sheet 850 may be 1.2 to 2 times, preferably 1.5 to 2 times the distance from the center to the edge of the transmitting coil 814. The heat generated in the region where the transmitting coil 814 and the receiving coil 914 meet can be diffused toward the edge of the thermally conductive sheet 850 and the heat generated in the hole 822, respectively.

Here, the thermally conductive sheet 850 may include a resin composition, and the resin composition may include a binder, a hardener, and a filler. At this time, the resin composition may contain 5 to 40 wt% of the binder, 4 to 10 wt% of the curing agent, and 50 to 90 wt% of the filler. When the binder, the curing agent and the filler are contained in these numerical ranges, a resin composition having good strength, excellent adhesion, easy thickness control, and excellent heat conduction performance can be obtained.

Here, the binder may include a Restriction of Hazardous Substance (RoHS) free or halogen free resin, a flame retardant epoxy resin, and a rubber resin. Here, the epoxy resin may include at least one of a crystalline epoxy compound containing a mesogenic structure or an amorphous epoxy compound. The amorphous epoxy compound may be, for example, bisphenol A type epoxy resin or bisphenol F type epoxy resin, but is not limited thereto. The rubber resin may include, for example, SBR (Styrene Butadiene Rubber).

The curing agent may include at least one of an acrylate curing agent, an amine curing agent, a phenol curing agent, an acid anhydride curing agent, a polymercaptan curing agent, a polyaminoamide curing agent, an isocyanate curing agent and a block isocyanate curing agent . The amine-based curing agent may be, for example, diamino diphenyl sulfone.

And, the filler may include boron nitride (BN). When the resin composition contains boron nitride, it can have insulating properties as well as high thermal conductivity. The filler may further include a diamond having a particle size (D50) of 1 占 퐉 to 12 占 퐉.

In addition, the resin composition may further include a catalyst, an additive and a solvent. The additive may include, for example, an imidazole-based additive. When the resin composition further contains an imidazole-based additive, the adhesion strength with the metal can be increased.

The thermally conductive sheet 850 according to an embodiment of the present invention can be manufactured by curing such a resin composition.

The thickness of the heat conductive sheet 850 formed on the inner wall of the housing 820 according to an embodiment of the present invention may be between 10 μm and 1000 μm. If the thickness of the thermally conductive sheet 850 is less than 10 mu m, the thermally conductive sheet 850 may not have a high thermal diffusivity. If the thickness of the thermally conductive sheet 850 exceeds 1000 mu m, There is a growing problem.

11, a concavo-convex structure 852 may be formed on the surface of the heat conduction sheet 850. As shown in FIG. The concavo-convex structure can be formed by embossing the heat conductive sheet 850, for example, but is not limited thereto. When the concavo-convex structure is formed on the surface of the heat conduction sheet 850, the heat generated from the transmission coil 814 can be more efficiently diffused to the edge of the heat conduction sheet 850.

Meanwhile, according to another embodiment of the present invention illustrated in FIGS. 12 to 13, in order to lower the surface temperature of the wireless power transmission device 800 during wireless charging, the housing 820 may include a resin composition having heat- have. Here, the resin composition may be a resin composition contained in the thermally conductive sheet 850 of Figs. 10 to 11.

As described above, when the housing 820 of the wireless power transmitting apparatus 800 includes the resin composition, the heat generated in the region where the transmitting coil 814 and the receiving coil 914 meet is in the direction of the edge of the housing 820 And may be discharged to the outside through a hole 822 formed in the side wall of the housing 820. [

13, an uneven structure 824 may be formed on the inner wall of the housing 820 including the resin composition. When the concave and convex structure 824 is formed on the inner wall of the housing 820, heat generated from the transmission coil 814 can be more efficiently diffused to the edge of the housing 820.

Hereinafter, the heat dissipation performance of a wireless power transmission apparatus and a wireless power reception apparatus according to an embodiment of the present invention will be described with reference to examples and comparative examples.

≪ Example 1 >

As shown in FIG. 10, a hole was formed in the housing, and a wireless power transmission apparatus including a heat dissipation fan and a heat dissipation pin was used to perform wireless charging for 90 minutes in a 5W class. At this time, a heat-dissipating fan having an output power of 1.56 W and a heat-dissipating fin made of aluminum are used. The surface temperature of the rear case of the wireless power receiving apparatus was measured.

≪ Example 2 >

A thermally conductive sheet having a thickness of 400 mu m, a size of 1.5 times as large as that of the transmission coil, and a thermal conductivity of 10 W / mK was prepared by using a resin composition containing 28 wt% of SBR, 5 wt% of an acrylate curing agent, 2 wt% of additives, and 65 wt% Respectively. As shown in FIG. 10, a hole was formed in the housing, and a thermally conductive sheet was bonded to a wireless power transmission apparatus including a heat-dissipating fan and a heat-dissipating fin, and wireless charging was performed for 90 minutes in a 5W class. At this time, a heat-dissipating fan having an output power of 1.56 W and a heat-dissipating fin made of aluminum are used. The surface temperature of the rear case of the wireless power receiving apparatus was measured.

<Comparative Example>

The surface temperature of the rear case of the wireless power receiving apparatus was measured after wireless charging was performed under the same conditions as in Example 1 except for the hole, the heat radiation fan, and the heat dissipation pin of Example 1.

Table 1 shows the temperature measurement results of Examples and Comparative Examples.

Temperature (℃) Example 1 Example 2 Comparative Example Initial temperature (캜) 23.0 23.0 23.2 Maximum temperature after wireless charging (℃) 38.6 36.5 43.8 ΔT (° C.) 15.6 13.5 20.6

Referring to Table 1, it can be seen that Examples 1 and 2 have a maximum temperature of 5 ° C or lower after radio-charging compared with Comparative Example. That is, it can be seen that the maximum temperature of the surface of the device after the wireless charging can be lowered by forming holes in the housing of the wireless power transmission device and including the heat dissipation fan and the heat dissipation fin as in the first embodiment. It can also be seen that, as in Example 2, when the thermally conductive sheet is further adhered to the inner wall of the housing, the maximum temperature of the surface of the device after the wireless charging can be further lowered.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

Claims (9)

A wireless power transmission apparatus for wireless charging,
A transmission module including a shield layer and a transmission coil wound on the shield layer in parallel to the plane of the shield layer and formed on the shield layer,
A receiver housing the transmission module, the housing including at least one hole,
And a wireless power transmitter. The method according to claim 1,
Wherein the holes are formed on both sidewalls of a surface that the wireless power receiving device contacts during wireless charging. The method according to claim 1,
And a heat dissipation fan or a heat dissipation pin accommodated in the housing, the dissipation fin discharging heat generated from the transmission module. The method according to claim 1,
A heat transfer sheet formed on the inner wall of the housing for diffusing heat generated from the transmission module,
The wireless power transmission device further comprising: 5. The method of claim 4,
And the heat conduction sheet is disposed opposite to the transmission coil. 5. The method of claim 4,
Wherein the thermally conductive sheet is disposed in correspondence with an area where a receiving coil of the wireless power receiving device is located when wirelessly charged. 5. The method of claim 4,
And a concavo-convex structure is formed on a surface of the heat conduction sheet. The method according to claim 1,
Wherein the housing comprises an epoxy resin composition comprising a binder and a filler, wherein the filler is selected from the group consisting of boron nitride and diamond. 9. The method of claim 8,
And a concavo-convex structure is formed on at least one surface of the inner wall of the housing.
KR1020140158272A 2014-11-13 2014-11-13 Wireless power transmitting apparatus for wireless charging KR20160057247A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106356917A (en) * 2016-08-30 2017-01-25 于士博 Wireless charging transmitting device
WO2018151472A1 (en) * 2017-02-17 2018-08-23 삼성전자 주식회사 Blower and docking device comprising blower
WO2018190510A1 (en) * 2017-04-11 2018-10-18 엘지이노텍(주) Wireless power module
WO2019031775A1 (en) * 2017-08-07 2019-02-14 엘지이노텍 주식회사 Wireless charging device case
US10938239B2 (en) 2015-08-13 2021-03-02 Samsung Electronics Co., Ltd. Wireless charging method and apparatus thereof
CN113746176A (en) * 2021-09-13 2021-12-03 Oppo广东移动通信有限公司 Wireless charging seat and heat dissipation seat thereof and method for charging by using wireless charging seat

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10938239B2 (en) 2015-08-13 2021-03-02 Samsung Electronics Co., Ltd. Wireless charging method and apparatus thereof
US11451074B2 (en) 2015-08-13 2022-09-20 Samsung Electronics Co., Ltd. Wireless charging method and apparatus thereof
US11652373B2 (en) 2015-08-13 2023-05-16 Samsung Electronics Co., Ltd. Wireless charging method and apparatus thereof
CN106356917A (en) * 2016-08-30 2017-01-25 于士博 Wireless charging transmitting device
WO2018151472A1 (en) * 2017-02-17 2018-08-23 삼성전자 주식회사 Blower and docking device comprising blower
US10739822B2 (en) 2017-02-17 2020-08-11 Samsung Electronics Co., Ltd. Blower and docking device comprising blower
WO2018190510A1 (en) * 2017-04-11 2018-10-18 엘지이노텍(주) Wireless power module
WO2019031775A1 (en) * 2017-08-07 2019-02-14 엘지이노텍 주식회사 Wireless charging device case
CN113746176A (en) * 2021-09-13 2021-12-03 Oppo广东移动通信有限公司 Wireless charging seat and heat dissipation seat thereof and method for charging by using wireless charging seat

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