Supporter

A supporter includes a housing and a guide member formed at one side of the housing. The guide member has an inclined surface. A fixing member faces the guide member to fix an object and a transmission coil is disposed in the housing to wirelessly transmit power.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority under 35 U.S.C. § 119 to Korean Application Nos. 10-2013-0106833 and 10-2013-0106834, both filed on Sep. 5, 2013, whose entire disclosures are hereby incorporated by reference.

BACKGROUND

The embodiment relates to a supporter capable of supporting and charging an object.

Recently, studies and research has been actively conducted on a wireless power transmission (or wireless energy transfer) technique of wirelessly transferring electric energy to a desired device. In order to utilize such a wireless power transmission technique, a transmitter end for transmitting wireless power and a receiver end for receiving wireless power transmitted may be provided.

The transmitter end may be provided in a case (hereinafter, referred to as a supporter) and the receiver end may be provided in a wireless terminal. Thus, the wireless power transmitted from the transmitter end of the supporter is received at the receiver end, such that the wireless terminal is charged.

DETAILED DESCRIPTION

In the description of embodiments, it will be understood that when one component is referred to as being ‘on (above)’ or ‘under (below)’ another component, the terminology of ‘on (above)’ and ‘under (below)’ includes both the meanings of ‘directly’ and ‘indirectly’. Further, the meaning of ‘on’ and ‘under’ each layer includes not only an upper direction, but also a lower direction.

Prior to explaining a supporter, a system reflecting the overall system of wireless power transmission will be described.

FIG. 1is a block diagram showing a wireless power transmission system according to an embodiment. Referring toFIG. 1, the wireless power transmission system may include a power source100, a wireless power transmitter200, a wireless power receiver300and a load400.

The power source100may be included in the wireless power transmitter200, but the embodiment is not limited thereto. The wireless power transmitter200may include a transmission induction coil210and a transmission resonant coil220. The wireless power receiver300may include a reception resonant coil310, a reception induction coil320and a rectifying circuit330. Both terminals of the power source100may be connected to both terminals of the transmission induction coil210.

The transmission resonant coil220may be spaced apart from the transmission induction coil210by a predetermined distance. The reception resonant coil310may be spaced apart from the reception induction coil320by a predetermined distance.

Both terminals of the reception induction coil320may be connected to both terminals of the rectifying circuit330, and the load400may be connected to both terminals of the rectifying circuit330. According to an embodiment, the load400may be included in the wireless power receiver300.

The power generated from the power source100is transmitted to the wireless power transmitter200. The power received in the wireless power transmitter200is transmitted to the wireless power receiver300that makes resonance with the wireless power transmitter200due to a resonance phenomenon, that is, has the resonance frequency the same as that of the wireless power transmitter200.

The power source100may generate AC power having a predetermined frequency and may transmit the AC power to the wireless power transmitter200. The transmission induction coil210and the transmission resonant coil220may be inductively coupled with each other. In other words, if AC current flows through the transmission induction coil210due to the power received from the power source100, the AC current may be induced to the transmission resonant coil220physically spaced apart from the transmission induction coil210due to the electromagnetic induction.

Thereafter, the power received in the transmission resonant coil220may be transmitted to the wireless power receiver300, which makes a resonance circuit with the wireless power transmitter200, through resonance. Power may be transmitted between two LC circuits which are impedance-matched with each other through resonance. The power transmitted through the resonance can be farther transmitted with higher efficiency when comparing with the power transmitted by the electromagnetic induction.

The reception resonant coil310may receive power transmitted from the transmission resonant coil220through the frequency resonance. The AC current may flow through the reception resonant coil310due to the received power. The power received in the reception resonant coil310is transmitted to the reception induction coil320, which is inductively coupled with the reception resonant coil310, due to the electromagnetic induction. The power received in the reception induction coil320may be rectified by the rectifying circuit330and transmitted to the load400.

The transmission induction coil210, the transmission resonant coil220, the reception resonant coil310, and the reception induction coil320may have one of spiral and helical structures, but the embodiment is not limited thereto. The transmission induction coil210and the reception resonant coil310may be resonantly coupled with each other to enable power to be transmitted at a resonance frequency. Since the transmission resonant coil220is resonantly coupled with the reception resonant coil310, the power transmission efficiency between the wireless power transmitter200and the wireless power receiver300may be significantly improved.

As described above, the wireless power transmission system which transmits power in a resonant frequency scheme has been described. The embodiment may be applied to power transmission of an electromagnetic induction scheme as well as a resonant frequency scheme. According to an embodiment, when the wireless power transmission system transmits power based on electromagnetic induction, the transmission resonant coil220included in the wireless power transmitter200and the reception resonant coil310included in the wireless power receiver300may be omitted.

A quality factor and a coupling coefficient are important in the wireless power transmission. That is, the power transmission efficiency may be proportional to each of the quality factor and the coupling coefficient. Thus, as at least one of the quality factor and the coupling coefficient is increased, the power transmission efficiency may be improved. The quality factor may refer to an index of energy that may be stored in the vicinity of the wireless power transmitter200or the wireless power receiver300.

The quality factor may vary according to the operating frequency ω as well as a shape, a dimension and a material of a coil. The quality factor may be expressed as following equation 1:
Q=w*L/R[Equation 1]

Where L refers to the inductance of a coil and R refers to resistance corresponding to the quantity of power loss caused in the coil.

The quality factor may have a value of 0 to infinity. When the quality factor has a greater value, the power transmission efficiency between the wireless power transmitter200and the wireless power receiver300may be more improved.

The coupling coefficient represents the degree of inductive magnetic coupling between a transmission coil and a reception coil, and has a value of 0 to 1. The coupling coefficient may vary according to the relative position and the distance between the transmission coil and the reception coil.

FIG. 2is an equivalent circuit diagram of the transmission induction coil according to an embodiment. As shown inFIG. 2, the transmission induction coil210may include an inductor L1and a capacitor C1, and a circuit having a desirable inductance and a desirable capacitance can be constructed by the inductor L1and the capacitor C1.

The transmission induction coil210may be constructed as an equivalent circuit in which both terminals of the inductor L1are connected to both terminals of the capacitor C1. In other words, the transmission induction coil210may be constructed as an equivalent circuit in which the inductor L1is connected to the capacitor C1in parallel.

The capacitor C1may include a variable capacitor, and impedance matching may be performed by adjusting the capacitance of the capacitor C1. The equivalent circuits of the transmission resonant coil220, the reception resonant coil310and the reception induction coil320may be equal or similar to the circuit shown inFIG. 2, but the embodiment is not limited thereto.

FIG. 3is an equivalent circuit diagram of the power source and the wireless power transmitter according to an embodiment. As shown inFIG. 3, the transmission induction coil210and the transmission resonant coil220may be constructed by using inductors L1and L2and capacitors C1and C2having predetermined inductances and capacitances, respectively.

FIG. 4is an equivalent circuit diagram of the wireless power receiver according to an embodiment. As shown inFIG. 4, the reception resonant coil310and the reception induction coil320may be constructed by using inductors L3and L4, and capacitors C3and C4having predetermined inductances and capacitances, respectively.

The rectifying circuit330may convert AC power transferred from the reception induction coil320into DC power and may transfer the DC power to the load400. In detail, although not shown, the rectifying circuit330may include a rectifier and a smoothing circuit. According to the embodiment, the rectifying circuit may include a silicon rectifier and as shown inFIG. 4, may be equivalent to a diode D1, but the embodiment is not limited thereto. The rectifier may convert AC power transferred from the reception induction coil320into DC power.

The smoothing circuit may remove AC components included in the DC power converted by the rectifier to output a smoothed DC power. According to an embodiment, as shown inFIG. 4, a rectifying capacitor C5may be used as the smoothing circuit, but the embodiment is not limited thereto. The DC power transferred from the rectifying circuit330may be DC voltage or current, but the embodiment is not limited thereto.

The load400may be an arbitrary rechargeable battery or a device requiring the DC power. For example, the load400may refer to a battery. The wireless power receiver300and the load400may be included in a wireless terminal5or an electronic apparatus.

For example, the wireless terminal5may include a smart phone or a tablet PC. The electronic apparatus may be a device, such as a mouse or a keyboard, requiring charged power. Thus, the reception resonant coil310and the reception induction coil320may have shapes corresponding to the shape of an electronic appliance.

The wireless power transmitter200may exchange information with the wireless power receiver300through in-band or out-of-band communication. The in-band communication may refer to the communication for exchanging information between the wireless power transmitter200and the wireless power receiver300by using a signal having a frequency used in the wireless power transmission. To this end, the wireless power receiver300may further include a switch and may receive the power transmitted from the wireless power transmitter200through a switching operation of the switch or not. Thus, the wireless power transmitter200detects an amount of power consumed in the wireless power transmitter200, so that the wireless power transmitter200may recognize an on or off signal of the switch included therein.

In detail, the wireless power receiver300may change an amount of power dissipated in a resistor by using the resistor and a switch, so that the power consumed in the wireless power transmitter200may be changed. The wireless power transmitter200may sense a change of the consumed power to obtain information about a state of the wireless power receiver300. The switch and the resistor may be connected in series to each other. The information about a state of the wireless power receiver300may include information about a current charged amount and/or the change of charged amount of the wireless power receiver300.

When the switch is opened, the power dissipated in the resistor is 0 (zero) and the power consumed in the wireless power transmitter200is also reduced. If the switch is shorted, the power absorbed in the resistor is more than 0 and the power consumed in the wireless power transmitter200is increased. While the wireless power receiver repeats the above operation, the wireless power transmitter200may detect the power consumed in the wireless power transmitter200and may perform digital communication with the wireless power receiver300.

The wireless power transmitter200receives the information about the state of the wireless power receiver300according to the above operation, so that the wireless power transmitter200may transmit the power suitable to the reception state of the wireless power receiver300.

To the contrary, the wireless power transmitter200may include a resistor and a switch to transmit the information about the state of the wireless power transmitter200to the wireless power receiver300. According to one embodiment, the information about the state of the wireless power transmitter200may include information about the maximum amount of power to be supplied from the wireless power transmitter200, the number of wireless power receivers300receiving the power from the wireless power transmitter200and the amount of available power of the wireless power transmitter200.

The out-of-band communication refers to the communication performed through a specific frequency band other than the resonance frequency band in order to exchange information necessary for the power transmission. The wireless power transmitter200and the wireless power receiver300can be equipped with out-of-band communication modules to exchange information necessary for the power transmission. The out-of-band communication module may be installed in the power supply device. In one embodiment, the out-of-band communication module may use a short-distance communication technology, such as Bluetooth, ZigBee, WLAN or NFC, but the embodiment is not limited thereto.

FIG. 5is a side perspective view showing a wireless terminal supporter according to the embodiment.FIG. 6is a front perspective view showing a wireless terminal supporter according to the embodiment. Referring toFIGS. 5 and 6, the wireless terminal supporter may include a housing1and a fixing member3. Although the embodiment is described while focusing on a wireless terminal supporter, the supporter of the embodiment may be applied to various objects to be supported and charged. For example, the object may include a battery, an electronic appliance and a home appliance which are required to be supported and charged, as well as a wireless terminal.

The housing1may have a rectangular shape when viewed at a front side thereof, but the embodiment is not limited thereto. The wireless terminal5may have a rectangular shape and a round-shaped edge, but the embodiment is not limited thereto. Thus, the wireless terminal5may have a wide width and a narrow width. A height h of the housing1may be at least longer than the narrow width of the wireless terminal5and a width w of the housing1may be at least wider than the wide width of the wireless terminal5, but the embodiment is not limited thereto.

The power source100and the wireless power transmitter200shown inFIGS. 1 to 4may be included in the wireless terminal supporter. The power source100and the wireless power transmitter200may be installed in the housing1. The wireless power receiver300and the load400shown inFIGS. 1 to 4may be installed in the wireless terminal5.

Wireless power may be transmitted through the power source100and the wireless power transmitter200of the wireless terminal supporter. In this case, when the wireless terminal5approaches the wireless terminal supporter in a distance at which the wireless terminal5can receive the wireless power, the wireless power provided from the wireless power transmitter300may be received by the wireless power receiver300of the wireless terminal5so that the wireless power may be provided to the load400. The load400may be a chargeable device such as a battery of the wireless terminal5.

A guide member7may be disposed to face the fixing member3. The guide member7may be formed on a front surface of the housing1facing the fixing member3. The guide member7may have an inclined surface inclined at 5° or more about a normal line, but the embodiment is not limited thereto.

Since the wireless terminal5and the guide member7of the housing facing each other make contact with each other, the wireless terminal5may be inclined at 5° or more about a normal line. Since the wireless terminal5is stably maintained by the guide member7of the housing1, the wireless terminal5is not shaken.

Although not shown, an absorption member is formed on a surface of the guide member7of the housing1making contact with the wireless terminal5, so that the wireless terminal5placed on the guide member7may be stably maintained without any shake. For example, the absorption member may be formed of a resin material or a plastic material, but the embodiment is not limited thereto. For example, a plurality of protrusions may be formed on the surface of the absorption member through an embossing process, but the embodiment is not limited thereto.

In addition, in order to more firmly fix the wireless terminal5, the fixing member3may be used. At least one portion of the fixing member3may basically make contact with the guide member7of the housing1. As shown inFIG. 7, if the wireless terminal5is inserted between the fixing member3and the guide member7of the housing1, the wireless terminal5may fall downwardly between the guide member7of the housing1and the fixing member3while the fixing member3is pushed away from the guide member7of the housing1.

As shown inFIGS. 8 and 9, the wireless terminal5that falls downward may be securely mounted on a secure member35of the housing1. A shape formed by the guide member7and the secure member35may correspond to a shape formed by rear and side surfaces of the wireless terminal5. That is, when the rear and side surfaces of the wireless terminal5has a vertical shape, the secure member35, that is, a top surface of the secure member35may be perpendicular to the guide member7. The wireless terminal5may be stably maintained and fixed without any shake due to the inclination of the guide member7, the secure member35and the fixing member3.

When wireless power is provided from the wireless power receiver200installed in the housing1to the wireless terminal5securely mounted on the secure member35of the housing1, the wireless power is received by the wireless power receiver300installed in the wireless terminal5and is provided to the load400, so that the load400, that is, the battery may be charged.

If the wireless power receiver300is included in the battery, the battery instead of the wireless terminal5is directly mounted on the secure member35of the housing1such that the battery may be charged. According to the embodiment, not only the battery, but also the wireless terminal5equipped with the battery can be mounted and charged.

As described above, at least one of the quality factor and the coupling coefficient must be increased to improve the power transmission efficiency between the wireless power transmitter200and the wireless power receiver300. Although several conditions may be set to improve the power transmission efficiency, the transmission coil210or210and220of the wireless power transmitter200must face the reception coil320or310and320in parallel with each other. The transmission coil210or210and220of the wireless power transmitter200installed in the housing1may be disposed in parallel with the guide member7of the housing1.

FIG. 10is an exploded perspective view showing a wireless terminal supporter according to the embodiment. Referring toFIG. 10, the wireless terminal supporter according to the embodiment may include a housing1and a fixing member3.

The housing1may include a first case33and a second case75coupled to the first case33. The first case33may include a secure member35formed in a lower portion thereof and a guide member7inclined to the secure member35. The secure member35and the guide member7may be formed integrally with each other through a molding process, but the embodiment is not limited thereto. A rear surface of the wireless terminal5may lean against the guide member7and may be securely mounted on the secure member35.

A buffer member45may be disposed on the secure member35. That is, the buffer member45may be attached to a top surface of the secure member35. When the buffer member45is securely mounted on the buffer member45, the buffer member45prevents the wireless terminal5from sliding so that the wireless terminal5may be prevented from shaking. The buffer member45may be formed of a resin material such as epoxy having elasticity or a rubber material, the embodiment is not limited thereto.

A plurality of grooves may be formed on the top surface of the buffer member45, for example, in one direction, but the embodiment is not limited thereto. The grooves or protrusions may further restrain the wireless terminal5from shaking. The buffer member45may have a shape corresponding to a shape of a top surface of the secure member35, but the embodiment is not limited thereto.

A first recess37may be provided in a central portion of the secure member35. The first recess37may have a shape recessed from one side surface of the secure member35toward the guide member7. The secure member35may include second and third recesses42and43formed at both sides of the first recess37. The second and third recesses42and43may have the shapes recessed downwardly.

The secure member35may include a first side wall81disposed in the first and second recesses37and42and a second side wall83disposed in the first and third recesses37and43. First and second holes39and41may be formed on the first and second side walls81and83, respectively. The first recess37may communicate with the second and third recesses42and43through the first and second holes39and41.

A recess having a shape equal to that of the first recess37of the secure member35may be formed at the center of the buffer member45. As the buffer member45is attached to the secure member35, upper portions of the second and third recesses42and43of the secure member35may be closed.

The fixing member3is connected to the secure member35such that the fixing member may rotatably move. The fixing member3may include first and second supports11and13, first and second rotation shafts19and21, a pressing part25and an inlet part27. The pressing part25may extend from the first and second supports11and13. In other words, the first and second supports11and13may be branched from the pressing part25. Thus, an opening30may be formed by the pressing part25and the first and second supports11and13.

For example, the first and second supports11and13branched from the pressing part25may be gradually spaced apart from each other in the downward direction and then gradually closed to each other. Due to such a shape, the strength of the fixing member3is fully concentrated on the wireless terminal5so that the wireless terminal5may be firmly fixed, and the contact area of the pressing part25and the first and second supports11and13with respect to the wireless terminal5may be maximized so that the wireless terminal5may be securely fixed.

An interval between low portions of the first and second supports11and13may be less than a diameter of the opening30. The interval between low portions of the first and second supports11and13may be less than a width of the first recess37of the secure member35, that is, an interval between the first and second side walls81and83. Thus, first and second connecting members15and17, which extend from the low portions of the first and second supports11and13, may be inserted into the first recess37between the first and second side walls81and83of the secure member35.

The first and second connecting members15and17may extend from the first and second supports11and13toward the guide member7. The first and second connecting members15and17may allow the first and second rotation shafts19and21to be connected to the first and second connecting members15and17, respectively. That is, the first connecting member15may extend from the first support11and the first rotation shaft19may extend from the first connecting member15. The second connecting member17may extend from the second support13and the second rotation shaft21may extend from the second connecting member17.

The first and second rotation shafts19and21may extend from one ends of the first and second connecting members15and17such that the first and second rotation shafts19and21are gradually spaced apart from each other. For example, the first rotation shaft19may extend from one end of the first connecting member15in the left direction when viewed at a front side, and the second rotation shaft21may extend from one end of the second connecting member17in the right direction.

The rotation shaft19may extend into the second recess42such that the first rotation shaft19passes through the first hole39formed in the first side wall81of the secure member35. The second rotation shaft21may extend into the third recess43such that the second rotation shaft21passes through the second hole41formed in the second side wall83of the secure member35.

First and second contact parts23may extend from each of the first and second rotation shafts19and21. The first and second contact parts23may extend downwardly from one ends of the first and second rotation shafts19and21, respectively, but the embodiment is not limited thereto.

First and second contact parts23make contact with first and second elastic members28and29so that the first and second contact parts23are always subject to restoring force by the first and second elastic members28and29, so the first and second contact parts23may tend to move away from the guide member7. The first and second elastic members28and29may be springs, but the embodiment is not limited thereto.

When the first and second contact parts23moves away from the guide member7due to the restoring force so that the first and second rotation shafts19and21are rotated clockwise, the first and second supports11and13, the pressing part25and the inlet part27, which are connected to the first and second rotation shafts19and21, may move in the direction opposite to the first and second contact parts23, that is, toward the guide member7.

If the wireless terminal5is inserted between the guide member7and the inlet part27, the inlet part27may move away from the guide member7by the wireless terminal5. When the first and second rotation shafts19and21are rotated counterclockwise as the inlet part27moves, the first and second contact parts23connected to the first and second rotation shafts19and21is forcibly moved to approach the guide member7, so that the first and second elastic members28and29may be compressed by each of the first and second contact parts23. However, since the restoring force is still applied to the first and second contact parts23by the first and second elastic members28and29, torque that allows the first and second rotation shafts19and21to be rotated clockwise is generated and is mostly transferred to the first and second supports11and13, the pressing part25and the inlet part27, so that the first and second supports11and13, the pressing part25and the inlet part27(specifically, the pressing part25) may press a part of the top surface of the wireless terminal5and the pressing state may continue until the wireless terminal5is detached from the housing1.

The inlet part27is disposed to face the guide member7. As the inlet part27moves upwardly, the inlet part27may move to be away from the guide member7. In other words, the inlet part27may extend from the pressing part25and may be bent to be gradually away from the guide member7.

The fixing member3may include the buffer member31for preventing a scratch which may be generated when the fixing member3makes contact with the wireless terminal5. The buffer member31may be attached to an inside surface of the fixing member3. In detail, the buffer member31may be attached at least to an inside surface of the pressing part25. The buffer member31may be attached onto the entire region of the pressing part25and a region of the inlet part27. The buffer member31may include one of a resin material, a rubber material and a plastic material, but the embodiment is not limited thereto.

A printed circuit board65, a heat sink61and a transmission coil210or210and220may be disposed between the first and second cases33and75. An electronic device69such as a power source100or a control unit may be mounted on the printed circuit substrate65.

The electronic device69may be disposed on a rear surface of the printed circuit substrate65such that the electronic device69faces an inner surface of the second case75. As the electronic device69is disposed as described above, an effect of a magnetic field generated from the transmission coil210or210and220may be minimized. In addition, as the electronic device69is disposed as described above, the heat sink61and the printed circuit board65make contact with each other, such that the heat generated from the transmission coil210or210and220and transferred to the heat sink61may be transferred to the printed circuit board65, thereby improving the thermal dissipation efficiency.

The wireless power transmitter200may be configured with the control unit and the transmission coil210or210and220. The power source100may be included in the wireless power transmitter200.

The control unit may control the entire wireless power transmission. For example, the control unit may adjust a quantity of wireless power to be transmitted to the wireless power receiver300provided to the wireless terminal5, may process a follow-up action based on information about a charged state of the wireless power receiver300, or may control wireless communication between the wireless transmitter200and the wireless power receiver300, but the embodiment is not limited thereto.

The printed circuit board65may include at least one opening67. For example, the opening67may be formed at a center of the printed circuit board65, but the embodiment is not limited thereto. The size of the opening67may be equal to or greater than that of the protrusion member77of the second case75which will be described below, the embodiment is not limited thereto. The size of the opening67may vary with the size of the protrusion member77.

The opening67may have a rectangular shape, but the embodiment is not limited thereto. At least one opening67formed in the printed circuit board65may have mutually different sizes and/or shapes.

The electronic device69may be mounted on the printed circuit board65except for the opening67. A connector63may be connected to one side of the printed circuit board65. The connector63may transfer a signal from an outside to the electronic device69or a signal from the electronic device69to an outside.

The transmission coil210or210and220may be disposed on the top surface of the printed circuit board65. The transmission coil210or210and220may generate wireless power to transmit the wireless power to the wireless terminal5. As described above, the wireless power transmission scheme may include an electromagnetic induction scheme and resonant frequency scheme.

A magnetic substrate59may be disposed between the printed circuit substrate65and the transmission coil210or210and220. The magnetic substrate59may include a magnetic substance of a ferrite, but the embodiment is not limited thereto. The magnetic substrate59may be a magnetic substance in itself or may include a substrate and a magnetic substance disposed on the substrate. The magnetic substrate59may prevent the magnetic field generated from the transmission coil210or210and220from exerting an influence on an electronic device.

The transmission coil210or210and220may be attached on the magnetic substrate59. For example, the magnetic substance may be attached on the substrate, the transmission coil210or210and220may be attached on the magnetic substance, and an insulating layer may be formed on the transmission coil210or210and220, but the embodiment is not limited thereto.

Since current flows through the transmission coil210or210and220, heat is generated. If such heat is not rapidly exhausted, the heat exerts an influence on the magnetic field induced by the transmission coil210or210and220, so that power transferring efficiency may be ultimately deteriorated.

To solve the problem, the heat sink61may be disposed between the printed circuit board65and the magnetic substance59. The magnetic substrate59, the heat sink61and the printed circuit substrate65may be collectively coupled to each other, but the embodiment is not limited thereto. For example, at least one screw may pass through the magnetic substrate59and the heat sink61such that the at least one screw is coupled to the printed circuit board65. For example, the heat sink61may be formed of anodized aluminum, but the embodiment is not limited thereto.

The magnetic substrate59may make contact with of a top surface of the heat sink61and the printed circuit board65may make contact with a bottom surface of the heat sink61. The heat generated from the transmission coil210or210and220may be transferred to the printed circuit board65through the heat sink61. When the heat transferred to the printed circuit board65is not rapidly radiated to an outside, the heat may exert an influence on the electronic devices69mounted on the printed circuit board.

To this end, at least one thermal pad73may be disposed between the electronic device69and the inner surface of the second case75. That is, an adhesive material may be formed on both sides of the thermal pad73, by which the electronic device69may be adhesive to one surface of the thermal pad73and the other surface of the thermal pad73may be adhesive to the inner surface of the second case75. Thus, the heat transferred to the printed circuit board65may be transferred to the second case75through the electronic device69and the thermal pad73, so that the heat may be radiated to an outside.

Nevertheless, when the charging operation is performed for a long time, there may be a limit to the radiation of the heat generated from the transmission coil210or210and220from the printed circuit board65to an outside through the thermal pad73. To solve the above problem, the second case75may make contact with the heat sink61.

The second case75may include a protrusion member77protruding inward, that is, in the direction close to the guide member7. The second case75may protrude toward the first case33. The protrusion member77may be formed on the printed circuit board65corresponding to an opening formed in the printed circuit board65. For example, since the opening67is formed on a central portion of the printed circuit board65, the protrusion member77may be also formed on the central portion of the second case75. A thickness of the protrusion member77may be set by taking into consideration the thicknesses of the printed circuit board65, the electronic device69and a space margin.

A thermal plate79may be disposed on a top surface of the protrusion member77. In addition, the top surface of the protrusion member77may include an opening (not shown) and the thermal plate may be installed into the opening. The top surface of the protrusion member77may make contact with a rear surface of the heat sink61through the opening67of the printed circuit board65. The thermal plate79disposed on the protrusion member77may make contact with the rear surface of the heat sink61through the opening67of the printed circuit board65.

The thermal pad71may be disposed between the thermal plate79and the heat sink61in order to enhance the contact strength between the thermal plate79and the heat sink61and improve the thermal dissipation efficiency. That is, the heat sink61may make stable contact with the thermal plate79of the protrusion member77by the thermal pad71. Due to the thermal pad71, the heat sink61is not separated from the thermal plate79of the protrusion member77.

Thus, the heat generated from the transmission coil210or210and220may be transferred to the heat sink61and the heat transferred to the heat sink61may be transferred to the second case75through the printed circuit board65, the electronic device69and the thermal pad73.

In addition, the heat transferred to the heat sink61may be transferred to the thermal plate79disposed on the protrusion member77of the second case75through the thermal pad71.

Such thermal transferring paths are arranged as follows:

As described above, according to the embodiment, since the heat of the transmission coil210or210and220is radiated through two paths, the thermal dissipation efficiency may maximized. Due to the maximization of the thermal dissipation efficiency, a magnetic field is stably generated from the transmission coil210or210and220, so that the power transferring efficiency may be improved.

The first and second cases33and75may be coupled to each other by using at least one screw. That is, at least one screw49may be coupled to the second case75through the coupling hole47of the first case33.

The first and second elastic members28and29may be fixed to the insides of the second and third recesses42and43of the secure member35through an elastic member coupling member51. The first and second elastic members28and29may be fixed into the first and second regions of the elastic member coupling member51. The elastic member coupling member51may be coupled to the secure member35by coupling at least one screw55to the secure member35through the coupling hole53.

The elastic member coupling member51may be detachably attached to the secure member35. Due to the detachable attachment, if necessary, the first and second elastic members28and29may be exchanged.

The wireless power receiver400according to the embodiment may be installed in a mobile terminal such as a mobile phone, a smart phone, a laptop computer, a digital broadcasting receiver, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player) or a navigation device.

However, it may be easily understood by those skilled in the art that the configuration according to the embodiment is applicable to a fixed terminal such as a digital TV or a desktop computer as well as the mobile terminal.

According to the embodiment, a scheme of transmitting power through electromagnetic induction may signify a tightly coupling scheme having a relatively low Q value, and a scheme of transmitting power through resonance may signify a loosely coupling scheme having a relatively high Q value.

The embodiment provides a supporter capable of maximizing wireless power transmission efficiency.

The embodiment provides a support capable of stably fixing an object.

The embodiment provides a supporter capable of easily detaching an object therefrom.

The embodiment provides capable of maximizing heat radiation efficiency.

According to the embodiment, there is provided a supporter including a housing; a guide member formed at one side of the housing and having an inclined surface; a fixing member facing the guide member to fix an object; and a transmission coil disposed in the housing to wirelessly transmit power.

According to the embodiment, the wireless terminal wirelessly receives power from the transmission coil of the supporter.

According to the embodiment, there are provided following advantages.

First, an object may be safely supported by disposing the guide member of the housing to be inclined.

Secondly, since the fixing member is disposed to connect with the housing such that a pressing pressure is generated toward the guide member of the housing, a part of the object is always pressed while the object is supported, so that the object may be fixed not to be shaken.

Thirdly, the transmission coil is parallel with the inclined guide member, so that the power transmission efficiency of the object may be improved.

Fourthly, the heat sink disposed at the low portion of the transmission coil makes contact with the thermal plate while passing through the printed circuit board, so that the heat generated from the transmission coil may be rapidly radiated to an outside via the heat sink and the thermal plate, thereby improving the radiation efficiency.

Fifthly, the heat sink disposed to the low portion of the transmission coil makes contact with the printed circuit board and the electronic device mounted on the printed circuit board is attached onto the case through thermal pad, so that the heat generated from the transmission coil may be rapidly radiated to an outside through the heat sink, the printed circuit board, the electronic device and the thermal plate, thereby improving the radiation efficiency.