Power transmission and reception system and electronic device

Abstract

Provided is a power transmission and reception system comprising: a power transmission unit connected to an external power source; and a power reception unit for receiving power from the power transmission unit and supplying the power to a body of an electronic device. The power transmission unit comprises: a first coil for generating a wireless power signal by using input power provided through the external power source; a first connector for receiving the input power; and a first control unit for controlling the power transmission unit, and the power reception unit comprises: a power supply unit for supplying power to the body of the electronic device; a second coil for providing the power supply unit with power transferred by the wireless power signal; a second connector coupled to the first connector so as to provide the power supply unit with power to be received; and a second control unit for, when the second connector is coupled to the first connector, supplying the body of the electronic device with power received through the second connector, and when the second connector is separated from the first connector, supplying the body of the electronic device with power transferred through the second coil.

Description

Power transmission and reception systems and electronic devices

[0001] The present invention relates to a power transmission and reception system capable of transmitting power wirelessly or wiredly and an electronic device having the same.

[0002] Electronic devices used in everyday life come in a variety of forms, from multimedia devices like displays and audio systems to home appliances like washing machines and refrigerators. Electronic devices operate by receiving power and are connected to a power source. Traditionally, power was supplied via wires, but with the recent proliferation of wireless power transmission technology, a variety of electronic devices can now receive power wirelessly.

[0003] Wireless power transmission method transmits power without using cables, preventing messy cables from being exposed to the outside, and has the advantage of being convenient to move.

[0004] However, the wireless power transmission method has the disadvantage of being relatively less efficient than the wired method, so users have a need for a system that can selectively supply power in a wired or wireless manner.

[0005] The present invention aims to provide a power transmission and reception system capable of selectively transmitting power wirelessly or wiredly and an electronic device having the same.

[0006] A power transmission and reception system is provided, comprising: a power transmitter connected to an external power source; and a power receiver that receives power from the power transmitter and supplies it to an electronic device body, wherein the power transmitter comprises: a first coil that generates a wireless power signal using input power provided through the external power source; a first connector that receives the input power; and a first control unit that controls the power transmitter, wherein the power receiver comprises: a power supply unit that supplies power to the electronic device body; a second coil that provides power transmitted by the wireless power signal to the power supply unit; a second connector that provides power to be supplied when coupled with the first connector to the power supply unit; and a second control unit that supplies power received through the second connector to the electronic device body when the second connector is coupled with the first connector, and supplies power transmitted through the second coil to the electronic device body when the second connector is separated from the first connector.

[0007] The power transmission unit includes a power factor regulator that adjusts the power factor of the external power source; and a first switch that selectively connects the power factor regulator and the first coil, and the first control unit can turn off the switch when the first connector and the second connector are connected, and the first control unit can turn on the switch when the first connector and the second connector are not connected.

[0008] The power receiving unit includes a second switch that selectively connects the power supply unit and the first coil, and the second control unit can turn off the switch when the first connector and the second connector are connected, and the first control unit can turn on the switch when the first connector and the second connector are not connected.

[0009] The first coil may further include an inverter that converts direct current voltage into alternating current voltage, and the second coil may further include a rectifier that converts alternating current voltage into direct current voltage.

[0010] The power transmitting unit may be located below the power receiving unit when transmitting power through the first coil, and may be located above the power receiving unit when transmitting power through the first connector.

[0011] The power transmitter includes a transmitter housing including a first surface on which the first coil is arranged and a second surface adjacent to the first surface and having a smaller area than the first surface, and the first connector may be located on the second surface.

[0012] The power transmission unit may be arranged so that the first side faces upward when power is transmitted through the first coil, and the second side faces downward when power is transmitted through the first connector.

[0013] The above first coil may be arranged in multiple numbers on the first surface.

[0014] The power receiver includes a receiver housing including a third surface on which the second coil is arranged and a fourth surface adjacent to the third surface and having a smaller area than the third surface, and the second connector can be located on the fourth surface.

[0015] The power receiving unit may be hinge-coupled to the back surface of the electronic device body, and may be arranged so that the third side faces downward when receiving power through the second coil, and the fourth side faces upward when receiving power through the second connector.

[0016] The power receiver may be coupled to the lower part of the back surface of the electronic device body and may include an opening through which a stand for placing the electronic device body on the floor passes.

[0017] An electronic device is provided, comprising: a main body that operates by receiving power; a power transmitter connected to an external power source; and a power receiver that receives power from the power transmitter and supplies it to the main body, wherein the power transmitter includes a first coil that generates a wireless power signal by using input power provided through the external power source; a first connector that receives the input power; and a first control unit that controls the power transmitter, wherein the power receiver includes a second coil that receives the wireless power signal and generates wireless power; a second connector that is coupled to the first connector and receives wired power; and a second control unit that supplies the wired power to the main body when the second connector is coupled to the first connector and supplies the wireless power to the main body when the second connector is separated from the first connector.

[0018] The power transmission unit is located below the power reception unit when the main body is mounted on a stand, and transmits power through the first coil, and is located above the power reception unit when the main body is mounted on a wall, and can transmit power through the first connector.

[0019] The power transmitter includes a transmitter housing including a first surface on which the first coil is arranged and a second surface adjacent to the first surface and having a smaller area than the first surface, and the first connector may be located on the second surface.

[0020] The power receiving unit includes a receiving unit housing including a third surface on which the second coil is arranged and a fourth surface adjacent to the third surface and having a smaller area than the third surface; and a hinge portion that rotatably connects the receiving unit housing to the main body, wherein the hinge portion can be switched to a state in which the third surface faces downward or a state in which the fourth surface faces upward.

[0021] A stand coupled to the back surface of the main body is included, and the power transmission unit is coupled to the lower part of the back surface of the main body and may include an opening through which the stand passes.

[0022] According to at least one embodiment of the present invention, power can be supplied wirelessly or wiredly, optionally depending on the usage pattern of the electronic device.

[0023] In addition, the power transmission and reception system according to at least one embodiment of the present invention can change its layout depending on the usage pattern, thereby enabling effective spatial layout.

[0024] The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention belongs from the description below.

[0025] Figure 1 is a front view showing a state in which an electronic device is mounted using a stand according to one aspect of the present invention.

[0026] FIG. 2 is a side view illustrating an embodiment of an electronic device mounted using a stand according to one aspect of the present invention.

[0027] FIG. 3 is a rear perspective view illustrating one embodiment of a first arrangement of a power transmission and reception system according to another aspect of the present invention.

[0028] FIG. 4 is a side view illustrating another embodiment of an electronic device mounted using a stand according to one aspect of the present invention.

[0029] FIG. 5 is a rear perspective view illustrating one embodiment of a first arrangement of a power transmission and reception system according to another aspect of the present invention.

[0030] FIG. 6 is a side view illustrating an embodiment of an electronic device according to one aspect of the present invention mounted on a wall.

[0031] FIG. 7 is a side view illustrating another embodiment of an electronic device according to one aspect of the present invention mounted on a wall.

[0032] FIG. 8 is a rear perspective view illustrating a second arrangement of a power transmission and reception system according to another aspect of the present invention.

[0033] Figure 9 is a conceptual diagram illustrating a wireless power transmission method of the power transmission and reception system of the present invention.

[0034] Figure 10 is a conceptual diagram illustrating a wired power transmission method of the power transmission and reception system of the present invention.

[0035] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components will be given the same reference numbers and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably only for the convenience of writing the specification, and do not in themselves have distinct meanings or roles. In addition, when describing the embodiments disclosed in this specification, if it is determined that a specific description of a related known technology may obscure the gist of the embodiments disclosed in this specification, a detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

[0036] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0037] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0038] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0039] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0040] FIG. 1 is a front view showing a state in which an electronic device (100) is mounted using a stand (120) according to one aspect of the present invention, and FIG. 2 is a side view showing a state in which an electronic device (100) is mounted using a stand (120) according to one aspect of the present invention.

[0041] Referring to FIG. 1, a display device is disclosed as an electronic device (100). The display device (100) includes a main body (110) with a display positioned on the front, and a power transmission / reception system (200). The power transmission / reception system (200) supplies power for driving the main body (110).

[0042] FIG. 3 is a rear perspective view illustrating a first arrangement according to an example of a power transmission and reception system (200) of the present invention.

[0043] A power transmission and reception system (200) may include a power transmission unit (210) connected to an external power source and a power reception unit (220) connected to a main body (110) of an electronic device (100). The power transmission unit (210) may include a first coil (212) that generates a wireless power signal using input power input through an external power source.

[0044] The power receiver (220) includes a power supply unit (224) that is coupled to the main body (110) and supplies power to the main body (110) so that the electronic components of the main body (110) can operate. In addition, the power receiver (220) includes a second coil (222) that receives a wireless power signal generated from the first coil (212) and provides power to the power supply unit (224).

[0045] The power transmitter (210) and the power receiver (220) can wirelessly transmit and receive power while being separated from each other through the first coil (212) and the second coil (222). Power is generated when a current flows in the second coil (222) under the influence of the electromagnetic field generated by the first coil (212), i.e., the wireless power signal.

[0046] Wireless power transmission methods include magnetic induction, magnetic resonance, and electromagnetic wave methods. The magnetic induction method utilizes the phenomenon in which a change in current in a first coil (212) causes a change in a magnetic field, which in turn generates a counter electromotive force in a second coil (222). While the magnetic induction method is highly efficient, it has the disadvantage of requiring a short distance between the first coil (212) and the second coil (222).

[0047] The magnetic resonance method allows for charging at longer distances than the magnetic induction method. While the method is similar in that the magnetic field generated in the first coil (212) induces current in the second coil (222), energy can be transmitted over longer distances if the resonance frequency is consistent between coils located far apart.

[0048] The electromagnetic wave method is a technology that utilizes highly directional antennas and can secure sufficient transmission distance by utilizing the far field, but because it fundamentally uses the principle of energy radiation, it has very low efficiency and uses high frequencies.

[0049] In the present invention, the input power can be transmitted wirelessly by matching the resonance frequency of the first coil (212) and the resonance frequency of the second coil (222) using a magnetic resonance method.

[0050] The power transmitter (210) may be positioned below the power receiver (220) and may be placed on a mounting surface for mounting the electronic device (100). In the present embodiment, the display device may be mounted on a cabinet (10) for a desired viewing height, and the power transmitter (210) may be positioned inside the cabinet (10) as shown in FIGS. 1 and 2.

[0051] The power receiver (220) coupled to the main body (110) may be positioned at the bottom of the main body (110) so as to be positioned adjacent to the power transmitter (210) located at the bottom. In the case of a display device, since it includes a wide front surface, it may be positioned on the back surface of the main body (110) so as not to be visible from the front surface. The power receiver (220) may be positioned at the bottom of the back surface of the main body (110).

[0052] The power transmitter (210) may include a transmitter housing (211), and the transmitter housing (211) may have a rectangular parallelepiped shape in which a first surface (211a) is wide and an adjacent second surface (211b) is thin. Since the first coil (212) needs to be placed over a wide area for transmission efficiency, the first coil (212) may be placed on the first surface (211a) of the transmitter housing (211).

[0053] The first coil (212) and the second coil (222) of the power receiving unit (220) can be arranged so that the first surface (211a) on which the first coil (212) of the power transmitting unit (210) is located faces upward so that they face each other.

[0054] The power receiver (220) may include a receiver housing (221), and the receiver housing (221) may also have a rectangular parallelepiped shape including a third surface (221a) adjacent to the third surface (221a) and a third surface (221a) having a smaller area than the third surface (221a).

[0055] The first coil (212) and the second coil (222) may be included in multiple numbers for power efficiency and may be widely arranged on the first side (211a) and the third side (221a).

[0056] The power transmitter (210) may be arranged so that the first coil (212) located on the first surface (211a) of the power transmitter (210) faces the power receiver (220) and the first surface (211a) faces upward.

[0057] The power receiving unit (220) can be arranged so that the third surface (221a) where the second coil (222) is located faces the first surface (211a) of the power transmitting unit (210) and the third surface (221a) faces downward.

[0058] The state in which the first surface (211a) of the power transmitter (210) and the third surface (221a) of the power receiver (220) are spaced apart from each other to face each other for wireless power transmission is called the first arrangement.

[0059] If there is no interference in the rear direction of the stand (120) supporting the main body (110) as shown in Fig. 2, there is no difficulty in placing the power receiving unit (220) in the shape of a rectangular parallelepiped on the lower rear surface of the main body (110) as shown in Fig. 2.

[0060] FIG. 4 is a side view showing a state in which an electronic device (100) is mounted using a stand (120) according to another embodiment of the present invention, and FIG. 5 is a rear perspective view showing a first arrangement according to another example of a power transmission and reception system (200) of the present invention.

[0061] As shown in Fig. 4, when the stand (120) supporting the main body (110) extends from the back of the main body (110), the power receiving unit (220) may include an opening (228) through which the stand (120) passes.

[0062] The opening (228) may be in the form of a hole, but in order for the power receiver (220) to rotate by means of a hinge (229), an opening (228) with one side open may also be used. The present embodiment may include an opening (228) with one side open for rotational movement by means of a hinge (229) described later.

[0063] FIG. 6 is a side view illustrating an embodiment of an electronic device (100) according to one aspect of the present invention mounted on a wall (20). The electronic device (100) of the present invention can be mounted on a wall (20) via an installation bracket (130), and in this case, the power transmitter (210) can be connected to an external power source installed on the wall (20).

[0064] The electronic device (100) can be installed on a wall (20) so that the external power source is located on the back of the electronic device (100), and the power transmission unit (210) can be installed on the upper side of the power reception unit (220) as shown in Fig. 6. In this case, since the distance between the power reception unit (220) and the power transmission unit (210) is close, power can be transmitted in a wired manner rather than a wireless manner.

[0065] That is, the power transmitter (210) includes a first connector (215) and the power receiver (220) includes a second connector (225), and the first connector (215) and the second connector (225) are combined to provide power input to the power transmitter (210) to the power receiver (220) in a wired manner.

[0066] According to the embodiment of FIG. 6, the third surface (221a) of the power receiving unit (220) faces downward, so the second connector (225) can be positioned on the fifth surface located opposite the third surface (221a). The first connector (215) of the power transmitting unit (210) can be positioned on one side of the first surface (211a) where the first coil (212) is positioned or the sixth surface located opposite thereto.

[0067] However, as described above, the first coil (212) and the second coil (222) are located on the first surface (211a) or the third surface (221a), which is a large surface area of ​​the housing, so when the third surface (221a) is placed on the wall (20) with the surface facing downward, there is a problem that the distance between the wall (20) and the main body (110) increases as shown in FIG. 6.

[0068] In order to solve the above problem, as shown in Fig. 7, the arrangement of the power receiving unit (220) can be changed so that the third surface (221a) faces the back, and then the power transmitting unit (210) can be connected in a wired manner. Fig. 7 is a side view showing the electronic device (100) of the present invention mounted on a wall (20), and the arrangement of the electronic device (100) is different from Fig. 6.

[0069] In order to change the arrangement of the power receiver (220) as shown in Fig. 6, the power receiver (220) can be rotatably coupled to the back surface of the main body (110) via a hinge (229). The hinge (229) can rotate 90°, so that the third surface (221a) of the power receiver (220) can be switched from a state in which the third surface (221a) faces downward (Fig. 2) to a state in which the third surface (221a) faces the back surface (Fig. 7).

[0070] Fig. 8 is a rear perspective view illustrating a second arrangement according to an example of a power transmission and reception system (200) of the present invention. After the hinge (229) is rotated so that the third surface (221a) of the power reception unit (220) faces the rear surface, the power transmission unit (210) can be placed on top of the power reception unit (220) to form the second arrangement. The second arrangement can reduce the distance between the rear surface of the main body (110) and the wall (20).

[0071] The third surface (221a) of the power receiver (220) may face the back, and the fourth surface (221b) adjacent thereto may be located on the upper side. The area of ​​the fourth surface (221b) may be narrower than that of the third surface (221a), and a second connector (225) may be located on the fourth surface (221b).

[0072] For wired power transmission, the second connector (225) of the power receiving unit (220) and the first connector (215) of the power transmitting unit (210) can be connected. The power transmitting unit (210) can be arranged so that the fourth surface (221b) of the power receiving unit (220) and the second surface (211b) of the power transmitting unit (210) are in contact with each other and the second surface (211b) faces downward. The power transmitting unit (210) is arranged above the power receiving unit (220), and the first connector (215) and the second connector (225) are coupled, and the power receiving unit (220) can receive power in a wired manner.

[0073] In wireless power mode, the wide first side (211a) and the third side (221a) may be arranged to face each other, and in wired power mode, the narrow second side (211b) and the fourth side (221b) may be arranged to face each other.

[0074] That is, the power transmission and reception system (200) of the present invention can be switched to one of the first arrangement (Fig. 3) optimized in terms of efficiency of the wireless power mode and the second arrangement (Fig. 5) that uses the space on the back of the electronic device (100) to a minimum.

[0075] FIG. 9 is a conceptual diagram illustrating a wireless power transmission method of a power transmission / reception system (200) of the present invention, and FIG. 10 is a conceptual diagram illustrating a wired power transmission method of a power transmission / reception system (200) of the present invention.

[0076] The power transmission and reception system (200) of the present invention is composed of a power transmission unit (210) and a power reception unit (220). The power transmission unit (210) may include a first coil (212), a first control unit (217), a plug (230), an EMI filter (218), a power factor corrector (214), an inverter (213), a first connector (215), and a first switch (216). The power reception unit (220) may include a second coil (222), a second control unit (227), a rectifier (223), a power supply unit (224), a second connector (225), and a second switch (226).

[0077] The plug (230) is connected to an external power source to receive power, and the EMI filter (218) removes noise from the external power supplied from the external power source. The power source from which noise has been removed can reduce power loss through a power factor corrector (214) (PFC: Power Factor Correction). The power factor corrector (214) can adjust the power factor of the power supplied from the external power source (10) to output a specified voltage.

[0078] According to one embodiment, the power factor corrector (214) can change the power factor to be close to 1 by matching the phases of the voltage and current of the rectified AC voltage, and output a DC voltage through a capacitor connected to the output terminal.

[0079] The inverter (213) converts the direct current voltage supplied from the power factor corrector (214) into alternating current and supplies it to the first coil (212). The first coil (212) is arranged in a spiral shape, and a wireless power signal is generated due to the current flowing along the spiral.

[0080] The second coil (222) generates an induced electromotive force in response to the wireless power signal formed in the first coil (212), causing current to flow and supplying power to the power supply unit (224).

[0081] The power supply unit (224) is a device that supplies power to the main body (110) of the electronic device (100), and converts the supplied power into accurate voltage, current, and frequency and supplies it. Before supplying power to the power supply unit (224), AC power can be converted into DC power through a rectifier (223).

[0082] In the process of supplying power wirelessly, the input external power passes through an EMI filter (218), is converted into direct current through a power factor corrector (214), and is then converted into alternating current through an inverter (213), and the power is wirelessly transmitted from the first coil (212) to the second coil (222). The power of the second coil (222) is converted back into direct current through a rectifier (223), and the power supply unit (224) supplies it to the electronic device (100).

[0083] When the first connector (215) and the second connector (225) are connected to transmit power in a wired manner, power converted into direct current by the power factor corrector (214) is transmitted to the power receiver (220) through the first connector (215) and the second connector (225), and the power supply unit (224) can supply the power to the electronic device (100).

[0084] At this time, in order to prevent unnecessary power waste, it is necessary to cut off the power supply to the wiring connected to the first coil (212) and the second coil (222). When the connection of the first connector (215) and the second connector (225) is detected, the first control unit (217) turns off the first switch (216) that disconnects the connection between the power factor corrector (214) and the inverter (213). In the drawing, the first switch (216) is located between the power factor corrector (214) and the inverter (213), but may also be located between the inverter (213) and the first coil (212).

[0085] The second control unit (227) can turn off the second switch (226) to disconnect the second coil (222) of the power receiver (220) from the rectifier (223) and the power supply unit (224). In the drawing, the second switch (226) is positioned between the rectifier (223) and the power supply unit (224), but may also be positioned between the rectifier (223) and the second coil (222).

[0086] If a current flow is detected in the wire connected to the first connector (215) and a current flow is detected in the wire between the second connector (225) and the power supply unit (224), it can be determined that the first connector (215) and the second connector (225) are connected.

[0087] In this way, the power transmission device of the present invention can selectively control the power supply direction through the first switch (216) and the second switch (226) to select either a wireless method or a wired method.

[0088] In addition, the power transmission and reception system (200) according to at least one embodiment of the present invention can change its layout depending on the usage pattern, thereby enabling effective spatial layout.

[0089] The above detailed description should not be construed as limiting in any respect and should be considered illustrative only. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are intended to be included within the scope of the present invention.

[0090] With respect to various embodiments for implementing the present invention, duplicate descriptions are omitted as they have been described above in the previous table of contents, Best Mode for Carrying Out the Invention.

[0091] The present invention is applicable to power transmission and reception systems and electronic devices in various fields, and thus its industrial applicability is recognized.

Claims

1. A power transmitter connected to an external power source; and It includes a power receiving unit that receives power from the power transmitting unit and supplies it to the electronic device body, The above power transmitter, A first coil that generates a wireless power signal using input power provided through the external power source; A first connector that receives the above input power; and Including a first control unit that controls the power transmission unit, The above power receiver, A power supply unit that supplies power to the electronic device body; A second coil that provides power transmitted by the wireless power signal to the power supply unit; A second connector that provides power to the power supply unit by being combined with the first connector; and The second connector is characterized by including a second control unit that supplies power received through the second connector to the electronic device body when the second connector is coupled with the first connector, and supplies power transmitted through the second coil to the electronic device body when the second connector is separated from the first connector. Power transmission and reception system.

2. In paragraph 1, The above power transmitter, A power factor regulator for adjusting the power factor of the external power source; and including a first switch selectively connecting the power factor regulator and the first coil; The first control unit is characterized in that it turns off the switch when the first connector and the second connector are connected, and the first control unit turns on the switch when the first connector and the second connector are not connected. Power transmission and reception system.

3. In paragraph 1, The above power receiver, A second switch is included that selectively connects the power supply unit and the first coil, The second control unit is characterized in that it turns off the switch when the first connector and the second connector are connected, and the first control unit turns on the switch when the first connector and the second connector are not connected. Power transmission and reception system.

4. In paragraph 1, The above first coil It further includes an inverter that converts direct current voltage into alternating current voltage, The second coil is characterized in that it includes a rectifier that converts alternating current voltage into direct current voltage. Power transmission and reception system.

5. In paragraph 1, The above power transmitter When transmitting power through the first coil, it is located at the bottom of the power receiving unit, Characterized in that it is located above the power receiving unit when transmitting power through the first connector. Power transmission and reception system.

6. In paragraph 1, The above power transmitter A transmitter housing including a first surface on which the first coil is arranged and a second surface adjacent to the first surface and having a smaller area than the first surface, A power transmission and reception system, characterized in that the first connector is located on the second surface.

7. In paragraph 6, The above power transmitter When power is transmitted through the first coil, the first side is arranged so that it faces upward, A power transmission and reception system characterized in that the second surface is arranged to face downward when power is transmitted through the first connector.

8. In paragraph 6, The above first coil is characterized in that a plurality of coils are arranged on the first surface. Power transmission and reception system.

9. In paragraph 1, The above power receiver A receiver housing including a third surface on which the second coil is arranged and a fourth surface adjacent to the third surface and having a smaller area than the third surface, A power transmission and reception system, characterized in that the second connector is located on the fourth surface.

10. In paragraph 9, The above power receiver is hingedly connected to the back surface of the electronic device body, When receiving power through the second coil, the third side is positioned so that it faces downward, A power transmission and reception system characterized in that the fourth surface is arranged to face upward when receiving power through the second connector.

11. In paragraph 1, The above power receiver Attached to the lower back of the above electronic device body, The electronic device body is characterized in that it includes an opening through which a stand that supports the floor passes. Power transmission and reception system.

12. Main body that operates by receiving power; A power transmitter connected to an external power source; and Includes a power receiving unit that receives power from the power transmitting unit and supplies it to the main body, The above power transmitter, A first coil that generates a wireless power signal using input power provided through the external power source; A first connector that receives the above input power; and Including a first control unit that controls the power transmission unit, The above power receiver, A second coil that receives the wireless power signal and generates wireless power; A second connector that is coupled with the first connector to receive wired power; and The second connector is characterized by including a second control unit that supplies the wired power to the main body when coupled with the first connector, and supplies the wireless power to the main body when the second connector is separated from the first connector. Electronic devices.

13. In paragraph 12, The above power transmitter When the above main body is mounted on a stand, it is located at the bottom of the power receiving unit and transmits power through the first coil. The above main body is mounted on the wall and is characterized in that it is located above the power receiving unit and transmits power through the first connector. Electronic devices.

14. In paragraph 12, The above power transmitter A transmitter housing including a first surface on which the first coil is arranged and a second surface adjacent to the first surface and having a smaller area than the first surface, The first connector is characterized in that it is located on the second surface. Electronic devices.

15. In paragraph 12, The above power receiver A receiver housing including a third surface on which the second coil is arranged and a fourth surface adjacent to the third surface and having a smaller area than the third surface; and It includes a hinge part that rotatably connects the receiver housing to the main body, The above hinge part, It is characterized in that the third side can be switched to a state facing downward or the fourth side can be switched to a state facing upward. Electronic devices.

16. In paragraph 12, Includes a stand attached to the back of the main body, The power transmission unit is coupled to the lower part of the back surface of the main body and is characterized by including an opening through which the stand passes. Electronic devices.

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