Wireless power transmission device

Abstract

A wireless power transmission device includes multiple transmitting coil units. Each of the multiple transmitting coil units includes multiple antennas having a three-dimensional multi-dimensional plane. The multiple antennas generate a magnetic field that penetrates at least one of the multi-dimensional planes to transmit power to a wireless power receiving device. Embodiments can improve power transmission efficiency and increase the degree of freedom of the wireless power receiving device, regardless of the placement or orientation of the wireless power receiving device.

Description

Technical Field

[0001] The embodiments relate to a wireless power transmission device. Background Art

[0002] Recently, wireless power transmission technology capable of transmitting electric power wirelessly has attracted much attention.

[0003] Wireless power transmission or wireless energy transfer technology is a technology that uses the induction principle of magnetic fields to wirelessly transmit electrical energy from a transmitter to a receiver.

[0004] Wireless power transmission technology can be used in various industries such as IT, railways, automobiles, display devices such as TVs, and home appliances, as well as mobile devices.

[0005] Research into the arrangement of a transmission coil unit for quickly charging transmission power in a wireless power receiving device is actively being conducted.

[0006] like Figure 1 As shown in FIG, a conventional wireless power transmitting device 10 includes a plurality of transmitting coils 12 arranged in a matrix.

[0007] When the wireless power receiving device 20 is provided on a plurality of transmitting coils 12, transmission power is transmitted to the wireless power receiving device 20 through the transmitting coil 12 adjacent to the wireless power receiving device 20 to charge the wireless power receiving device 20. Reference numeral 22 denotes a receiving coil.

[0008] like Figure 2 As shown in , when the plane of the receiving coil 22 of the wireless power receiving device 20 faces the plane of the third transmitting coil 12c among the multiple transmitting coils 12a to 12d, the magnetic field generated by the transmitting coil 12c undergoes magnetic linkage with the receiving coil 22 to induce a current in the receiving coil 22 and convert the current into a voltage to obtain received power.

[0009] However, if Figure 3 As shown in , when the plane of the receiving coil 22 of the wireless power receiving device 20 is perpendicular to the plane of the third transmitting coil 12c, the receiving coil 22 does not experience magnetic flux linkage due to the magnetic field generated by the third transmitting coil 12c, so that no current is induced in the receiving coil 22, and therefore no received power is obtained. In other words, as Figure 3 As shown in , when the wireless power receiving device 20 is set, the wireless power receiving device 20 is not charged or is charged with a small amount of power, so the power transmission efficiency is not very good. Summary of the Invention

[0010] Technical issues

[0011] It is an object of embodiments to address the above and other problems.

[0012] Another object of the embodiment is to provide a wireless power transmitting device capable of always ensuring maximum power transfer efficiency regardless of the arrangement position or direction of the wireless power receiving device.

[0013] Another object of the embodiment is to provide a wireless power transmitting device capable of always ensuring maximum power transmission efficiency despite the free movement of the wireless power receiving device.

[0014] Another object of an embodiment is to provide a wireless power transmitting device capable of improving charging efficiency of a wireless power receiving device regardless of an arrangement position or direction of the wireless power receiving device.

[0015] Technical Solution

[0016] According to one aspect of an embodiment for achieving the above and other purposes, a wireless power transmitting device includes: a plurality of transmitting coil units, wherein each of the plurality of transmitting coil units includes a plurality of antennas having a multi-dimensional plane with a three-dimensional structure, and the plurality of antennas are configured to generate a magnetic field passing through at least one or more planes of the multi-dimensional planes to transmit power to a wireless power receiving device.

[0017] Beneficial effects

[0018] Effects of the wireless power transmission device according to the embodiment are as follows.

[0019] According to at least one embodiment, even when the receiving coil of the wireless power receiving device is arranged tilted relative to the horizontal plane, the sum of the magnetic fluxes generated by the multiple antennas of each of the multiple transmitting coil units of the wireless power transmitting device and passing through the receiving coil is constant, thereby ensuring the same power transmission efficiency or the same charging efficiency regardless of the arrangement position or direction of the wireless power receiving device.

[0020] According to at least one of the embodiments, even when the arrangement position or direction of the wireless power receiving device is changed and the plane of the receiving coil of the wireless power receiving device is not arranged parallel to the horizontal plane, the same power transmission efficiency is ensured, thereby preventing the defect of reduced charging efficiency due to a significant reduction in power transmission efficiency when the arrangement position or arrangement direction of the wireless power receiving device is changed.

[0021] According to at least one of the embodiments, by including a transmitting coil unit, each including a plurality of antennas having a multi-dimensional plane arranged between 0 degrees and 359 degrees relative to a plurality of axes, the degree of freedom of the direction or position of the wireless power receiving device is further expanded, and constant power transmission efficiency can be ensured even if the position and direction of the wireless power receiving device are changed in various ways.

[0022] The further applicable scope of the embodiment will become apparent from the detailed description below. However, since those skilled in the art can clearly understand various changes and modifications within the spirit and scope of the embodiment, it should be understood that the detailed description and specific embodiments such as the preferred embodiment are given only by way of example. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A wireless power transmission device according to the prior art is shown.

[0024] Figure 2 FIG. 1 shows a charging state when a conventional wireless power receiving device is disposed in parallel with a wireless power transmitting device.

[0025] Figure 3 A conventional charging state is shown when the wireless power receiving device is arranged perpendicular to the wireless power transmitting device.

[0026] Figure 4 It is the equivalent circuit diagram of the magnetic induction scheme.

[0027] Figure 5 It is the equivalent circuit diagram of the electromagnetic resonance scheme.

[0028] Figure 6a and Figure 6b This is a block diagram illustrating a wireless power transmission device as one of wireless power transmission systems.

[0029] Figure 7 is a block diagram illustrating an electronic device as one of wireless power transmission systems.

[0030] Figure 8 A transmitting unit according to a first embodiment is shown.

[0031] Figure 9 It is an example Figure 8 A three-dimensional diagram of the transmitting coil unit.

[0032] Figure 10 It is an example Figure 8 A plan view of the transmitting coil unit.

[0033] Figures 11a to 11d Shown Figure 8 The magnetic field of each of the multiple antennas of the transmitting coil unit.

[0034] Figure 12a and Figure 12b A state in which a magnetic field generated by at least one of a plurality of antennas undergoes flux linkage with a receiving coil of a wireless power receiving device is shown.

[0035] Figure 13is a perspective view showing another transmitting coil unit according to the embodiment.

[0036] Figure 14 A transmitting unit according to a second embodiment is shown.

[0037] Figure 15 A wireless power transmission device according to a first embodiment is shown.

[0038] Figure 16 The mutual inductance between the receiving coil and each of the plurality of antennas of the plurality of transmitting coil units is shown.

[0039] Figure 17 is a flowchart for describing an operating method of the wireless power transmitting apparatus according to the first embodiment.

[0040] Figure 18 A wireless power transmission device according to a second embodiment is shown.

[0041] Figure 19 is a flowchart for describing an operating method of the wireless power transmission device according to the second embodiment.

[0042] Figure 20 A wireless power transmission device according to a third embodiment is shown.

[0043] Figure 21 is a flowchart for describing an operating method of the wireless power transmitting apparatus according to the third embodiment.

[0044] Figure 22 A state is shown in which two magnetic field loops are formed using four transmitting coil units when the receiving coil of the wireless power receiving device is provided on a plurality of transmitting coils so that the planes of the receiving coils face each other.

[0045] Figure 23 A state is shown in which one magnetic field loop is formed using four transmitting coil units when the receiving coil of the wireless power receiving device is arranged on a plurality of transmitting coils such that the planes of the receiving coils are perpendicular to each other.

[0046] Figure 24 The power transmission efficiency in the comparative example and the embodiment is shown.

[0047] Figure 25a and Figure 25b The mutual inductances of the first to third antennas of the transmission coil unit of the wireless power transmitting device relative to the wireless power receiving device when the wireless power receiving device is positioned at 0 degrees are shown.

[0048] Figure 26a and Figure 26bThe mutual inductances of the first to third antennas of the transmitting coil unit of the wireless power transmitting device relative to the wireless power receiving device when the wireless power receiving device is disposed at 45 degrees are shown.

[0049] Figure 27a and Figure 27b The mutual inductances of the first to third antennas of the transmitting coil unit of the wireless power transmitting device relative to the wireless power receiving device when the wireless power receiving device is disposed at 90 degrees are shown. DETAILED DESCRIPTION

[0050] Hereinafter, the preferred embodiments of the inventive concept will be described in detail with reference to the accompanying drawings. However, the technical ideas of the present disclosure are not limited to the embodiments to be described and can be implemented in various forms, and one or more of the components can be used by selectively combining and replacing the components of the embodiments within the scope of the technical ideas of the present disclosure. Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. It will also be further understood that terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art. The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the inventive concept. In this specification, unless the context clearly indicates otherwise, the singular may also include the plural, and "at least one (or more than one) of A, B, and C" used herein may include one or more of all possible combinations of A, B, and C. When describing the components according to the embodiments of the present disclosure, terms such as first, second, "A", "B", (a), (b), etc. may be used. These terms are merely intended to distinguish one component from another, and the terms do not limit the nature, sequence, or order of the components. It will be understood that when an element is referred to as being “connected to,” “coupled to,” or “accessible to” another element, although an element may be directly connected to or directly accessible to another element, an element may be “connected to,” “coupled to,” or “accessible to” another element via other elements. In addition, it will be understood that when each component is referred to as being formed or disposed “on (above)” or “under (below)” another component, it may be directly “on” or “under” the other component, or indirectly formed with one or more intermediate components therebetween. In addition, it will be understood that when each component is referred to as being formed or disposed “on (above)” or “under (below)” another component, it may mean both an upward direction and a downward direction of the component.

[0051] Hereinafter, a wireless power transmission system including a wireless power transmitting device with a function of wirelessly transmitting power and an electronic device that wirelessly receives power according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. For example, the electronic device may include a wireless power receiving device that wirelessly receives power, but is not limited thereto. The embodiments described below are provided as examples to fully convey the spirit of the present disclosure to those skilled in the art. Accordingly, the present disclosure may be implemented in other forms and is not limited to the embodiments described below. In addition, in the drawings, the size and thickness of the device may be exaggerated for convenience. Throughout the specification, similar reference numerals indicate similar elements.

[0052] The wireless power transmission device according to the embodiment may be configured in a pad type, a cradle type, an access point (AP) type, or the like.

[0053] The wireless power receiving device according to the embodiment is used for small electronic devices such as mobile phones, smart phones, laptop computers, digital broadcast terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation devices, MP3 players, electric toothbrushes, electronic tags, lighting devices, remote controllers, fishing floats, wearable devices (such as smart watches), etc., but is not limited thereto. The wireless power receiving device can be any mobile device as long as it can be charged by a battery equipped with the wireless power receiving device according to the embodiment.

[0054] Embodiments may consider a system capable of transmitting power to one or more electronic devices by using a wireless power transmission device including one or more transmission coils.

[0055] The terms used in the embodiments are as follows.

[0056] Wireless power transfer system: A system that provides wireless power transfer within a magnetic field area.

[0057] Wireless power transmission device (wireless power transmission system - charger): A device that provides wireless power transmission to electronic devices within the magnetic field area and manages the entire system.

[0058] Wireless power receiving device (wireless power receiver): A device that receives wireless power transmission from a wireless power transmitting device within the magnetic field area.

[0059] Charging area: an area in which wireless power transfer is performed in a magnetic field area and may vary according to the size of an application product such as an electronic device, requested power, and operating frequency.

[0060] The principle of wireless power transmission will be described. The principle of wireless power transmission is mainly divided into a magnetic induction scheme and an electromagnetic resonance scheme.

[0061] The magnetic induction scheme is a contactless energy transmission technology that generates an electromotive force in the load inductor when a source inductor and a load inductor are brought into close proximity. The electromagnetic resonance scheme is a technology for wirelessly transmitting energy using the following resonance technology: when magnetic resonance is generated by the natural frequency between two resonators by coupling the two resonators, the two resonators vibrate at the same frequency while forming electric and magnetic fields within the same wavelength range.

[0062] Figure 4 It is the equivalent circuit diagram of the magnetic induction scheme.

[0063] Reference Figure 4 In the equivalent circuit of the magnetic induction scheme, the wireless power transmission device can be implemented by a source voltage Vs according to the device for supplying power, a transmission resistor Rs, a transmission capacitor Cs for impedance matching, and a transmission coil (inductor) Ls for magnetic coupling with the wireless power receiving device. The wireless power receiving device can be implemented by a load resistor Rl as an equivalent resistor of the wireless power receiving device, a load capacitor Cl for impedance matching, and a load coil (load inductor) Ll for magnetic coupling with the wireless power transmission device. The degree of magnetic coupling between the transmission coil Ls and the load coil Ll can be represented by mutual inductance Msl.

[0064] As compensation capacitors for impedance matching, a transmission capacitor Cs may be added to the wireless power transmission device, and a load capacitor C1 may be added to the wireless power reception device. For example, the compensation capacitors Cs and C1 may be connected in series or in parallel with each of the reception coil Ls and the load coil L1. In addition to the compensation capacitors, passive components such as additional capacitors and additional inductors may also be added to each of the wireless power transmission device and the wireless power reception device.

[0065] Figure 5 It is the equivalent circuit diagram of the electromagnetic resonance scheme.

[0066] Reference Figure 5In the equivalent circuit of the electromagnetic resonance scheme, the wireless power transmission device is implemented by a source coil (a closed-loop circuit formed by the series connection of source voltage Vs, transmission resistor Rs, and transmission inductor Ls), and a resonant coil (a closed-loop circuit formed by the series connection of resonant inductor L1 and resonant capacitor C1). The wireless power reception device is implemented by a load coil (a closed-loop circuit formed by the series connection of load resistor R1 and load inductor L1), and a resonant coil (a closed-loop circuit formed by the series connection of resonant inductor L2 and resonant capacitor C2). Transmission inductor Ls and inductor L1 are magnetically coupled with a coupling coefficient K01, load inductor L1 and load-side resonant inductor L2 are magnetically coupled with a coupling coefficient K23, and resonant inductor L1 and resonant inductor L2 are magnetically coupled with a coupling coefficient K12. An equivalent circuit according to another embodiment can be implemented using only the resonant coil and the resonant coil, without the source coil and / or load coil.

[0067] In the electromagnetic resonance scheme, when the resonance frequencies of two resonators are equal to each other, most of the energy in the resonator of the wireless power transmitting device is transmitted to the resonator of the wireless power receiving device, so that power transfer efficiency can be improved.

[0068] In the electromagnetic resonance scheme, elements for impedance matching may be added to improve efficiency, and the impedance matching elements may be passive elements such as inductors and capacitors.

[0069] Hereinafter, a wireless power transfer system for transferring power in a magnetic induction scheme or an electromagnetic resonance scheme based on the wireless power transfer principle will be described.

[0070] <Wireless Power Transmission Device>

[0071] Figure 6a and Figure 6b This is a block diagram illustrating a wireless power transmission device as one of wireless power transmission systems.

[0072] Reference Figure 6a The wireless power transmission system according to the embodiment may include a wireless power transmitting device 100 and a wireless power receiving device 200 that wirelessly receives power from the wireless power transmitting device 100. For example, the wireless power receiving device 200 may include a wireless power receiving device that wirelessly receives power, but is not limited thereto.

[0073] The wireless power transmission device 100 may include: a power conversion unit 101 that performs power conversion on an input AC signal to output an AC signal; a resonance circuit unit 102 that generates a magnetic field based on the AC signal output from the power conversion unit 101 to provide power to the wireless power receiving device 200 within the charging area; and a control unit 103 that controls power conversion by the power conversion unit 101, adjusts the amplitude and frequency of the output signal of the power conversion unit 101, performs impedance matching of the resonance circuit unit 102, senses information about the impedance, voltage, and current from the power conversion unit 101 and the resonance circuit unit 102, and performs wireless communication with the wireless power receiving device 200.

[0074] The power conversion unit 101 may include at least one of a power conversion unit for converting an AC signal into a DC signal, a power conversion unit for outputting a DC signal by changing the level of the DC signal, and a power conversion unit for converting a DC signal into an AC signal. In addition, the resonant circuit unit 102 may include a coil and an impedance matching unit capable of resonating with the coil. In addition, the control unit 103 may include a sensing unit and a wireless communication unit for sensing information about impedance, voltage, and current. For example, the sensing unit may include a current measuring unit for measuring current, but is not limited thereto. For example, the communication unit may be capable of performing communication in a Bluetooth method. For example, the communication unit may be capable of performing communication in an in-band communication method or an out-of-band communication method.

[0075] Specifically, refer to Figure 6b The wireless power transmission device 100 may include an AC / DC conversion unit 110 , a DC / AC conversion unit 120 , an impedance matching unit 130 , a transmitting coil unit 140 , and a communication and control unit 150 .

[0076] The AC / DC conversion unit 110 is a power conversion unit that converts an AC signal received from the outside into a DC signal under the control of the communication and control unit 150. The AC / DC conversion unit 110 may be a subsystem including a rectifier 112 and a transmission-side DC / DC conversion unit 114.

[0077] The rectifier 112 is a system for converting a supplied AC signal into a DC signal. A diode rectifier having relatively high efficiency when operating at high frequencies, a synchronous rectifier fabricated as a single chip, or a hybrid rectifier capable of reducing cost and space and having a high degree of freedom in dead time can be used as an embodiment for implementing the rectifier 112. However, the present disclosure is not limited thereto, and any system for converting an AC signal into a DC signal can be applied.

[0078] In addition, the DC / DC conversion unit 114 adjusts the level of the DC signal provided by the rectifier 112 under the control of the communication and control unit 150. A buck converter that reduces the level of the input signal, a boost converter that increases the level of the input signal, and a buck-boost converter or a Cuk converter that reduces or increases the level of the input signal can be used as an embodiment for implementing the DC / DC conversion unit 114. In addition, the DC / DC conversion unit 114 may include a switching element that controls power conversion, an inductor and capacitor that serve as a power conversion medium or smoothes the output voltage, and a converter that adjusts voltage gain or performs an electrical separation (insulation) function. It can also remove ripple components or pulse components (AC components included in DC components) included in the input DC signal. In addition, the error between the command value and the actual output value of the output signal of the DC / DC conversion unit 114 can be adjusted through a feedback scheme, which can be performed by the communication and control unit 150.

[0079] The DC / AC conversion unit 120 is a system capable of converting the DC signal output from the AC / DC conversion unit 110 into an AC signal and adjusting the frequency of the converted AC signal under the control of the communication and control unit 150. A half-bridge inverter or a full-bridge inverter can be used as an embodiment for implementing the DC / AC conversion unit 120. In addition, various amplifiers for converting DC signals into AC signals can be applied to the wireless power transmission system, and examples of amplifiers include class A, B, C, E, and F amplifiers. Furthermore, the DC / AC conversion unit 120 may include an oscillator that generates the frequency of the output signal and a power amplifier that amplifies the output signal.

[0080] The impedance matching unit 130 minimizes reflected waves at locations with different impedances, thereby improving signal flow. Because the two coils of the wireless power transmission device 100 and the wireless power reception device 200 are spatially separated from each other, a large amount of magnetic field leaks. Accordingly, the efficiency of power transmission can be improved by compensating for the impedance difference between the two connected parts of the wireless power transmission device 100 and the wireless power reception device 200. The impedance matching unit 130 may include an inductor, a capacitor, and a resistor, and can adjust the impedance value used for impedance matching by varying the inductance of the inductor, the capacitance of the capacitor, and the resistance of the resistor under the control of the communication and control unit 150.

[0081] In addition, when the wireless power transmission system transmits power in a magnetic induction scheme, the impedance matching unit 130 may have a series resonance structure or a parallel resonance structure and may minimize energy loss by increasing the inductive coupling coefficient between the wireless power transmitting device 100 and the wireless power receiving device 200 .

[0082] In addition, when the wireless power transmission system transmits power in an electromagnetic resonance scheme, the impedance matching unit 130 allows real-time impedance matching according to the distance change between the wireless power transmitting device 100 and the wireless power receiving device 200 or the mutual influence from metal foreign objects (FO) and various devices, and a multiple matching scheme using capacitors, a matching scheme using multiple antennas, and a scheme using multiple loops can be used as a compensation scheme.

[0083] The coil unit 140 can be implemented by multiple coils or a single coil. When the coil unit 140 includes multiple coils, the coils can be spaced apart from each other or overlap each other. When the coils overlap each other, the overlapping area can be determined by considering the deviation of the magnetic flux density. In addition, the coil unit 140 can be manufactured by considering the internal resistance and radiation resistance. In this case, when the resistance component is small, the quality factor and transmission efficiency can be improved.

[0084] The communication and control unit 150 may include a control unit 152 and a communication unit 154. The control unit 152 may be configured to adjust the output voltage of the AC / DC converter 110 by taking into account the required power, the current charge level of the wireless power receiving device 200, and the wireless power scheme. Furthermore, the power to be transmitted may be controlled by generating the frequency and switching waveform used to drive the DC / AC converter 120, taking into account maximum power transfer efficiency. Furthermore, the control unit 152 may determine the size of the wireless power receiving device based on unique information (RXID) received from the wireless power receiving device. In other words, one of the multiple transmitting coils may be selected based on the size of the wireless power receiving device. The unique information (RXID) may include, but is not limited to, an RXID message, certificate information (certificate version), identification information, and an error detection code (CRC). The RXID message may include information regarding the size and power level of the wireless power receiving device.

[0085] In addition, the overall operation of the wireless power receiving device 200 can be controlled using algorithms, programs, or applications required for control read from a storage unit (not shown) of the wireless power receiving device 200. Furthermore, the control unit 152 may also be referred to as a microprocessor, microcontroller unit, or microcomputer. The communication unit 154 can communicate with the communication unit 264, and as an example of a communication scheme, a short-range communication scheme such as Bluetooth, NFC, or Zigbee can be used. The communication units 154 and 264 can transmit and receive charging status information and charging control commands to each other. Furthermore, the charging status information may include the number of wireless power receiving devices 2000, the remaining battery level, the number of charging operations, the amount of usage, the battery capacity, the battery ratio, and the amount of transmitted power of the wireless power transmitting device 100. Furthermore, the communication unit 154 can transmit a charging function control signal to control the charging function of the wireless power receiving device 200. The charging function control signal may be a control signal for enabling or disabling the charging function by controlling the wireless power receiving device 200.

[0086] As described above, the communication unit 154 can perform communication using an out-of-band scheme, where the communication unit 154 is configured as a separate module, but is not limited thereto. The communication unit 154 can also perform communication using an in-band scheme, where the wireless power receiving device uses the power signal transmitted by the wireless power transmitting device to transmit a feedback signal to the wireless power transmitting device. For example, the wireless power receiving device can modulate the feedback signal to transmit information such as charging start, charging end, and battery status to the wireless power transmitting device via the feedback signal. Furthermore, the communication unit 154 can be configured separately from the control unit 152, and the communication unit 264 of the wireless power receiving device 200 can be included in the control unit 262 of the wireless power receiving device or can be configured separately from the control unit 262.

[0087] <Wireless Power Receiving Device>

[0088] Figure 7 This is a block diagram illustrating a wireless power receiving device as one of wireless power transmission systems.

[0089] Reference Figure 7 The wireless power transmission system according to the embodiment may include a wireless power transmitting device 100 and a wireless power receiving device 200 that wirelessly receives power from the wireless power transmitting device 100. The wireless power receiving device 200 may include a receiving coil unit 210, an impedance matching unit 220, an AC / DC converter 230, a DC / DC converter 240, a load 250, and a communication and control unit 260.

[0090] The receiving coil unit 210 can receive power through a magnetic induction method or a magnetic resonance method. In this way, depending on the power receiving method, at least one of an induction coil and a resonance coil can be included. The receiving coil unit 210 can be provided with an antenna for near field communication (NFC). The receiving coil unit 210 can be the same as the coil unit 140, and the size of the receiving antenna can depend on the electrical characteristics of the wireless power receiving device 200.

[0091] The impedance matching unit 220 may perform impedance matching between the wireless power transmitting device 100 and the wireless power receiving device 200 .

[0092] The AC / DC converter 230 generates a DC signal by rectifying the AC signal output from the receiving coil unit 210 .

[0093] The DC / DC converter 240 may adjust the level of the DC signal output from the AC / DC converter 230 to match the capacity of the load 250 .

[0094] The load 250 may include a battery, a display, a voice output circuit, a main processor, and various sensors.

[0095] The communication and control unit 260 may be activated by the wake-up power from the communication and control unit 150 , communicate with the communication and control unit 150 , and control operations of subsystems of the wireless power receiving device 200 .

[0096] One or more wireless power receiving devices 200 can be provided and can simultaneously wirelessly receive energy from the wireless power transmitting device 100. That is, in a wireless power transmission system using the magnetic resonance method, multiple target wireless power receiving devices 200 can receive power from a single wireless power transmitting device 100. The matching unit 130 of the wireless power transmitting device 100 can adaptively perform impedance matching between the multiple wireless power receiving devices 200. This can also be applied in the same manner even when multiple independent coil units are provided in the magnetic induction method.

[0097] In addition, when multiple wireless power receiving devices 200 are provided, the system may have the same power receiving scheme or different power receiving schemes. In this case, the wireless power transmitting device 100 may be a system that transmits power using magnetic induction or magnetic resonance, or a system that uses both magnetic induction and magnetic resonance.

[0098] Figure 8 A transmitting unit according to a first embodiment is shown.

[0099] Reference Figure 8 , the transmitting unit according to the first embodiment may include a plurality of transmitting coil units 310 .

[0100] For example, the plurality of transmitting coil units 310 may be disposed on the same plane. For example, the plurality of transmitting coil units 310 may be arranged in a matrix.

[0101] Despite Figure 8 3 , a total of 16 transmitting coil units 310 are illustrated as being arranged in a matrix of 4 rows and 4 columns, but fewer or more transmitting coil units may be provided according to embodiments.

[0102] Although not shown, a plurality of transmitting coil units 310 may be accommodated in the housing.

[0103] Figure 9 It is an example Figure 8 A three-dimensional diagram of the transmitting coil unit.

[0104] Figure 9 The transmitting coil unit shown in FIG. Figure 8 One of the plurality of transmitting coil units 310 shown in FIG. 1 , and Figure 8 The other transmitting coil units 310 shown in FIG. 3 may have the same Figure 9 The transmitting coil unit shown in FIG. 1 has the same structure, shape and / or size as the transmitting coil unit shown in FIG. 1 , but is not limited thereto.

[0105] like Figure 9 As shown in FIG, the transmitting coil unit 310 may include a plurality of antennas 311 to 314 having a multi-dimensional plane arranged between 0 and 359 degrees with respect to a specific axis 320. For example, the specific axis 320 may be an x-axis, but is not limited thereto.

[0106] The multi-dimensional plane may mean a plurality of planes on which the plurality of antennas 311 to 314 are arranged. Figure 9 As shown in FIG, first plane 315 may coincide with a horizontal plane, and first antenna 311 may be disposed on first plane 315. Second plane 316 may be different from first plane 315, and second antenna 312 may be disposed on second plane 316. Third plane 317 may be different from first plane 315 or second plane 316, and third antenna 313 may be disposed on third plane 317. Fourth plane 318 may be different from first plane 315, second plane 316, or third plane 317, and fourth antenna 314 may be disposed on fourth plane 318. For example, second plane 316 may be defined by rotating 45 degrees relative to first plane 315, third plane 317 may be defined by rotating 90 degrees relative to first plane 315, and fourth plane 318 may be defined by rotating 135 degrees relative to first plane 315, but are not limited thereto.

[0107] For example, Figure 8Each of the plurality of transmitting coil units 310 shown in FIG. 3 may include a plurality of antennas 311 to 314 having a multi-dimensional plane disposed between 0 and 359 degrees with respect to a specific axis (x-axis) 320 .

[0108] As another example, Figure 8 Each of the multiple transmitting coil units 310 shown in the figure may include multiple antennas having a multidimensional plane arranged between 0 degrees and 359 degrees relative to different axes. For example, the first transmitting coil unit may include multiple antennas having a multidimensional plane arranged between 0 degrees and 359 degrees relative to the first axis, the second transmitting coil unit may include multiple antennas having a multidimensional plane arranged between 0 degrees and 359 degrees relative to the second axis, and the third transmitting coil unit may include multiple antennas having a multidimensional plane arranged between 0 degrees and 359 degrees relative to the third axis. Here, the first axis to the third axis may be perpendicular to each other, but are not limited to this. For example, the first axis and the second axis may intersect each other at an angle of 60 degrees, the first axis and the third axis may intersect each other at an angle of 100 degrees, and the second axis and the third axis may intersect each other at an angle of 120 degrees.

[0109] like Figure 10 As shown in FIG, the first antenna 311 can be arranged on a horizontal plane. The second antenna 312 can be arranged to rotate at an angle θ1 relative to the first antenna 311 around a specific axis 320. The third antenna 313 can be arranged to rotate at an angle θ2 relative to the first antenna 311 around the specific axis 320. The fourth antenna 314 can be arranged to rotate at an angle θ3 relative to the first antenna 311 around the specific axis 320. For example, θ1 can be 45 degrees, θ2 can be 90 degrees, and θ3 can be 135 degrees, but is not limited thereto.

[0110] exist Figure 9 , the first antenna 311 to the fourth antenna 314 are arranged at regular intervals of 45 degrees, but may be arranged at irregular or random intervals.

[0111] Although for convenience Figure 9 Four antennas 311 to 314 are shown, but more antennas may be provided.

[0112] When current flows, a magnetic field may be formed in each of the plurality of antennas 311 to 314 of the transmission coil unit.

[0113] like Figure 11a As shown in , when the first current flows through the first antenna 311 parallel to the horizontal plane in a counterclockwise direction, a first magnetic field B1 may be generated by passing through the first antenna 311 from the lower side of the first antenna 311 to the upper side of the first antenna 311 .

[0114] like Figure 11b As shown in , when the second current flows counterclockwise through the second antenna 312 rotated by θ1 relative to the first antenna 311, a second magnetic field B2 may be generated by passing through the second antenna 312 from the lower side to the upper side of the second antenna 312.

[0115] like Figure 11c As shown in , when the third current flows counterclockwise through the third antenna 313 rotated by θ2 relative to the first antenna 311, a third magnetic field B3 may be generated from the left side of the third antenna 313 to the right side of the third antenna 313.

[0116] like Figure 11d As shown in , when the fourth current flows counterclockwise through the fourth antenna 314 rotated by θ3 relative to the first antenna 311, a fourth magnetic field B4 may be generated from the left side of the fourth antenna 314 to the right side of the fourth antenna 314.

[0117] For example, when the same current flows through the first to fourth antennas 311 to 314 , the intensities of the magnetic fields B1 to B4 respectively generated by the first to fourth antennas 311 to 314 may be the same.

[0118] For example, when different currents flow through the first to fourth antennas 311 to 314 , respectively, the intensities of the magnetic fields B1 to B4 generated by the first to fourth antennas 311 to 314 , respectively, may be different.

[0119] In an embodiment, the magnetic field generated by each of the multiple antennas 311 to 314 of each of the multiple transmitting coil units 310 can be transmitted as transmission power to the wireless power receiving device. In other words, the magnetic field generated by each of the multiple antennas 311 to 314 of each of the multiple transmitting coil units 310 can induce a current in the receiving coil of the wireless power receiving device.

[0120] In an embodiment, since the multiple antennas 311 to 314 of each of the multiple transmitting coil units 310 have different arrangement directions and different distances from the wireless power receiving device, the magnetic fields generated by the multiple antennas 311 to 314 of each of the multiple transmitting coil units 310 can contribute differently to the current induction of the receiving coil of the wireless power receiving device.

[0121] Generally, when a transmitting coil that generates a magnetic field and a receiving coil that induces a current are placed side by side, the magnetic field generated by the transmitting coil causes more magnetic flux to flow through the receiving coil, thereby inducing a larger current. Since the magnetic flux flowing through the receiving coil decreases as the inclination of the receiving coil relative to the transmitting coil increases, the induced current can also decrease.

[0122] In an embodiment, even when the receiving coil of the wireless power receiving device is arranged tilted relative to the horizontal plane, the sum of the magnetic fluxes generated by the multiple antennas of each of the multiple transmitting coil units of the wireless power receiving device and passing through the receiving coil is constant, thereby ensuring the same power transmission efficiency or the same charging efficiency regardless of the arrangement position or direction of the wireless power receiving device.

[0123] like Figure 12a As shown in FIG, when the plane of the receiving coil 330 of the wireless power receiving device is arranged parallel to a horizontal plane, the plane of the first antenna 311 of the transmitting coil unit 310 is parallel to the plane of the receiving coil 330. Therefore, the magnetic field B1 generated by the first antenna 311 of the transmitting coil unit 310 can contribute most to the current induction in the receiving coil 330, and the magnetic fields generated by the other antennas 312 to 314 can contribute less to the current induction in the receiving coil 330 than the first antenna 311. In other words, the current is induced in the receiving coil 330 by the magnetic fields generated by the first to fourth antennas 311 to 314 of the transmitting coil unit 310, and in this case, the contributions of the magnetic fields generated by the first to fourth antennas 311 to 314 can differ. For example, the first antenna 311 can contribute most to the current in the receiving coil 330, followed by the second antenna 312 or the fourth antenna 314, and then the third antenna 313 can contribute least. In the receiving coil 330 of the wireless power receiving device, the reception power may be determined as the sum of currents induced by the magnetic fields of the first to fourth antennas 311 to 314 respectively having different contributions.

[0124] Similarly, if Figure 12bAs shown in FIG, when the plane of the receiving coil 330 of the wireless power receiving device is tilted 45 degrees relative to the horizontal plane, the plane of the second antenna 312 of the transmitting coil unit 310 is parallel to the plane of the receiving coil 330. Therefore, the magnetic field B2 generated by the second antenna 312 of the transmitting coil unit 310 has the largest contribution to the current induction in the receiving coil 330, and the magnetic fields generated by the remaining antennas (i.e., the first antenna 311, the third antenna 313, and the fourth antenna 314) may have relatively small contributions to the current induction in the receiving coil 330. In other words, the current is induced in the receiving coil 330 by the magnetic fields generated by the first antenna 311 to the fourth antenna 314 of the transmitting coil unit 310, and in this case, the contributions of the magnetic fields generated by the first antenna 311 to the fourth antenna 314 may be different. For example, the second antenna 312 may have the largest contribution to the current induction in the receiving coil 330, followed by the first antenna 311 or the third antenna 313, and then the fourth antenna 314 may have the smallest contribution. In the receiving coil 330 of the wireless power receiving device, the reception power may be determined as the sum of currents induced by the magnetic fields of the first to fourth antennas 311 to 314 respectively having different contributions.

[0125] like Figure 12a and Figure 12b As shown in , even when the placement or orientation of the wireless power receiving device changes, the sum of the currents induced by the magnetic fields of the first antenna 311 to the fourth antenna 314 of the transmitting coil unit 310 remains the same, and accordingly, the received power can also be the same. In other words, even when the plane of the receiving coil 330 of the wireless power receiving device is not parallel to the horizontal plane due to a change in the placement or orientation of the wireless power receiving device, the same power transmission efficiency can be maintained.

[0126] Therefore, the embodiment can prevent the disadvantage of the related art that the charging efficiency is reduced due to a significant reduction in power transfer efficiency when the arrangement position or arrangement direction of the wireless power receiving device is changed.

[0127] Furthermore, in an embodiment, the same supply voltage may be supplied so that the same current flows through the multiple antennas of each of the multiple transmitting coil units, or different supply voltages may be supplied so that different currents flow through the multiple antennas of each of the multiple transmitting coil units.

[0128] Figure 13 is a perspective view showing another transmitting coil unit according to the embodiment.

[0129] Figure 13 The transmitting coil unit 340 shown in FIG. Figure 8 One of the plurality of transmitting coil units 310 shown in FIG. 1 , and Figure 8 The other transmitting coil units 310 shown in FIG. 3 may have the same Figure 13 The transmitting coil unit 340 shown in FIG. 3 has the same structure, shape and / or size as the transmitting coil unit 340 , but is not limited thereto.

[0130] like Figure 13 As shown in , the transmitting coil unit 340 may include multiple antennas having multi-dimensional planes arranged between 0 and 359 degrees relative to the multiple axes 321 to 323. For example, the multiple axes 321 to 323 may include n axes having different directions from each other, but are not limited thereto.

[0131] For example, Figure 9 The plurality of antennas 311 to 314 shown in FIG. 3 may be disposed between 0 degrees and 359 degrees relative to the plurality of axes 321 to 323 , respectively.

[0132] Despite Figure 9 and Figure 13 The antennas 311 to 314 are illustrated as having a rectangular shape, but they may have various shapes. For example, the antennas 311 to 314 may have a circular shape, an elliptical shape, or a rectangular shape.

[0133] For example, in order to prevent a short circuit between the antennas 311 to 314 , the antennas 311 to 314 may be coated with enamel around the coils, but are not limited thereto.

[0134] like Figure 13 As shown in , since each of the multiple transmitting coil units 340 is provided with multiple antennas that generate magnetic fields in more directions, constant power transmission efficiency can be ensured even when the wireless power receiving device changes in various positions or directions, thereby further expanding the degree of freedom of direction or position of the wireless power receiving device.

[0135] Figure 14 A transmitting unit according to a second embodiment is shown.

[0136] Reference Figure 14 , the transmitting unit according to the second embodiment may include a plurality of transmitting coil units 341 to 343 .

[0137] For example, the plurality of transmitting coil units 341 to 343 may be disposed on the same plane. For example, the plurality of transmitting coil units 341 to 343 may be arranged in a matrix.

[0138] Despite Figure 8 3 , a total of 16 transmitting coil units 341 to 343 are illustrated as being arranged in a matrix of 4 rows and 4 columns, but fewer or more transmitting coil units may be provided according to embodiments.

[0139] Although not shown, the plurality of transmitting coil units 341 to 343 may be accommodated in a housing.

[0140] Each of the plurality of transmitting coil units 341 to 343 may include a plurality of antennas having multi-dimensional planes disposed between 0 degrees and 359 degrees with respect to different axes.

[0141] For example, each of the plurality of first transmitting coil units 341 may include a plurality of antennas having a multidimensional plane disposed between 0 and 359 degrees relative to the first axis 346. For example, each of the plurality of second transmitting coil units 342 may include a plurality of antennas having a multidimensional plane disposed between 0 and 359 degrees relative to the second axis 347. For example, each of the plurality of third transmitting coil units 343 may include a plurality of antennas having a multidimensional plane disposed between 0 and 359 degrees relative to the third axis 348. For example, the first axis 346 may indicate the x-axis, the second axis 347 may indicate the y-axis, and the third axis 348 may indicate the z-axis.

[0142] The first transmitting coil unit 341, the second transmitting coil unit 342, and the third transmitting coil unit 343 may be arranged according to a predetermined rule or randomly. For example, the first transmitting coil unit 341, the second transmitting coil unit 342, the third transmitting coil unit 343, the first transmitting coil unit 341, the second transmitting coil unit 342, and the third transmitting coil unit 343 may be arranged in their order in one direction. For example, the first transmitting coil unit 341, the third transmitting coil unit 343, the third transmitting coil unit 343, the first transmitting coil unit 341, the second transmitting coil unit 342, and the second transmitting coil unit 342 may be arranged in their order in one direction.

[0143] In addition, as an example, a plurality of transmitting coil units ( Figure 8 310 or Figure 14 The multiple antennas of each of 341 to 343) can be formed by a single coil in which the multiple antennas are connected to each other. Figure 9As shown in FIG, the first antenna 311 is wound, the second antenna 312 is wound so that one side of the first antenna 311 extends to the second antenna 312, the third antenna 313 is wound so that one side of the second antenna 312 extends to the third antenna 313, and the fourth antenna 314 is wound so that one side of the third antenna 313 extends to the fourth antenna 314. In other words, the first antenna 311 to the fourth antenna 314 can be formed by a single coil. In this case, a power supply (not shown) can be connected to the other side of the first antenna 311 and one side of the fourth antenna 314. Therefore, when a supply voltage is applied from the power supply, current flows through the first antenna 311, the second antenna 312, the third antenna 313, and the fourth antenna 314, so that a magnetic field is generated in each of the first antenna 311 to the fourth antenna 314 in a direction perpendicular to the plane of each of the first antenna 311 to the fourth antenna 314.

[0144] As another example, a plurality of transmitting coil units ( Figure 8 310 and Figure 14 The antennas 311 to 314 of 341 to 343 in FIG. 3 may be formed as independent coils. Figure 9 As shown in , the first antenna 311 may be formed by a first coil, the second antenna 312 may be formed by a second coil, the third antenna 313 may be formed by a third coil, and the fourth antenna 314 may be formed by a fourth coil. The first to fourth coils are not electrically connected to each other and are not formed integrally. In this case, the first to fourth antennas 311 to 314 may be independently connected to power supplies 351 to 354 ( Figure 15 ). Therefore, the magnetic field of the first antenna 311 can be generated by the supply voltage of the first power supply 351 ( Figure 15 、 Figure 18 and Figure 20 ), and the magnetic field of the second antenna 312 can be generated by the supply voltage of the second power supply 352. The magnetic field of the third antenna 313 can be generated by the supply voltage of the third power supply 353, and the magnetic field of the fourth antenna 314 can be generated by the supply voltage of the fourth power supply 354.

[0145] Figure 15 A wireless power transmission device according to a first embodiment is shown.

[0146] Reference Figure 15 , the wireless power transmitting device according to the first embodiment may include a plurality of transmitting coil units 310 , a plurality of power sources 351 to 354 , and a controller 350 .

[0147] The plurality of transmitting coil units 310 may be as follows Figure 8 or Figure 14 Arrange as shown in or in various other ways.

[0148] In the following, for convenience, Figure 8 The transmission coil unit 310 shown in FIG. 3 is given a limited description.

[0149] Since the multiple antennas of each of the multiple transmitting coil units 310 are formed of coils independent of each other, the power supplies 351 to 354 may be respectively and individually connected to the multiple antennas to generate a magnetic field in each of the multiple antennas.

[0150] For example, the plurality of power supplies 351 to 354 may be respectively connected to the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 .

[0151] like Figure 15 As shown in FIG, a first power source 351 may be connected to the first antenna 311, and a second power source 352 may be connected to the second antenna 312. In addition, a third power source 353 may be connected to the third antenna 313, and a fourth power source 354 may be connected to the fourth antenna 314.

[0152] Each of the multiple antennas 311 to 314 of each of the multiple transmitting coil units 310 can generate transmission power to be transmitted to the wireless power receiving device by supplying a supply voltage from the power supplies 351 to 354. The amplitude of the transmission power can be determined by the supply voltage supplied by the power supplies 351 to 354. For example, the supply voltage supplied from the first power supply 351 causes current to flow through the first antenna 311, and a magnetic field passing through the first antenna 311 can be generated in proportion to the flowing current. Since the strength of the magnetic field is the amplitude of the transmission power, the supply voltage supplied from the first power supply 351 can be increased to increase the amplitude of the transmission power. Accordingly, the strength of the magnetic field and the magnitude of the transmission power can be adjusted by adjusting the supply voltage of the first power supply 351.

[0153] The controller 350 may adjust the supply voltage of each of the power sources 351 to 354 based on the arrangement position or direction of the wireless power receiving device.

[0154] For example, the controller 350 may adjust the supply voltage of each of the power sources 351 to 354 based on the mutual inductance of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 with respect to the wireless power receiving apparatus.

[0155] When the wireless power receiving device is provided on a plurality of transmitting coil units 310, as shown in FIG. Figure 16 As shown in , mutual inductance is generated between the receiving coil of each of the wireless power receiving devices and each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 for the wireless power receiving devices.

[0156] It is assumed that each of the plurality of transmitting coil units 310 a to 310 d includes n antennas.

[0157] In the embodiment, for convenience of description, it is assumed that each of the plurality of transmitting coil units 310 includes n antennas, but more antennas may be provided.

[0158] In this case, n mutual inductances M11 to M1n are generated between the receiving coil and the n antennas of the first transmitting coil unit, and n mutual inductances M21 to M2n are generated between the receiving coil and the n antennas of the second transmitting coil unit. In addition, n mutual inductances M31 to M3n are generated between the receiving coil and the n antennas of the third transmitting coil unit, and n mutual inductances M41 to M4n are generated between the receiving coil and the n antennas of the fourth transmitting coil unit.

[0159] In this case, a magnetic channel represented by Equation 1 may be defined between the receiving coil and each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 .

[0160] [Formula 1]

[0161]

[0162] m nk Represents the magnetic channel, M nk Represents mutual inductance, R L represents the resistance of the wireless power receiving device, and Z L Indicates the impedance of the wireless power receiving device.

[0163] When the mutual inductance is obtained from Equation 1, the magnetic channel can be obtained based on the obtained mutual inductance.

[0164] The weight represented by Equation 2 can be obtained using the obtained magnetic channel.

[0165] [Formula 2]

[0166]

[0167] β nk represents the weight, m* nk represents a magnetic channel with a vector value, and ||m|| represents the sum of all magnetic channels.

[0168] For example, the weights may be beamforming vectors corresponding to the obtained mutual inductances.

[0169] The controller 350 may adjust the supply voltage of the power sources 351 to 354 according to the weight of each of the plurality of antennas 311 to 314 of the plurality of transmitting coil units 310 with respect to the wireless power receiving apparatus.

[0170] Figure 17 is a flowchart for describing an operating method of the wireless power transmitting apparatus according to the first embodiment.

[0171] like Figure 15 and Figure 17 As shown in , the controller 350 may obtain whether a wireless power receiving device is arranged ( S410 ).

[0172] The controller 350 may periodically transmit a request signal for detecting the wireless power receiving device or foreign matter. When the wireless power receiving device receives the request signal, the wireless power receiving device may transmit a response signal to the wireless power transmitting device.

[0173] When receiving the response signal from the wireless power receiving device, the controller 350 may detect that the wireless power receiving device is within a range or distance in which the wireless power transmitting device can transmit transmission power.

[0174] Alternatively, the wireless power receiving device may transmit a reception intensity indicating a reception level of the request signal to the wireless power transmitting device as a response signal, and the wireless power transmitting device may detect the position of the wireless power receiving device.

[0175] When the controller 350 detects that the wireless power receiving apparatus is within a distance at which the wireless power transmitting apparatus can transmit transmission power, the controller 350 may prepare to transmit transmission power.

[0176] To this end, the controller 350 may obtain mutual inductance of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 with respect to the wireless power receiving apparatus ( S420 ).

[0177] like Figure 16 As shown in FIG, the mutual inductance M11 between the receiving coil and the first antenna 311 can first be obtained in the first transmitting coil unit 310a. Subsequently, the mutual inductance M12 between the receiving coil and the second antenna 312 can be obtained. In this way, the mutual inductances M11 to M1n of the first antenna to the nth antenna of the first transmitting coil unit 310a with respect to the receiving coil can be sequentially obtained.

[0178] Thereafter, the mutual inductances M21 to M2n of the first to nth antennas included in the second transmitting coil unit 310b with respect to the receiving coil, the mutual inductances M31 to M3n of the first to nth antennas included in the third transmitting coil unit 310c with respect to the receiving coil, and the mutual inductances M41 to M4n of the first to nth antennas included in the fourth transmitting coil unit 310d with respect to the receiving coil can be obtained in sequence.

[0179] Although it has been described above that the mutual inductances are obtained sequentially, the mutual inductances M11 to M1n, M21 to M2n, M31 to M3n, and M41 to M4n of the first to nth antennas of the first to fourth transmitting coil units 310a to 310d with respect to the receiving coils may be obtained all at once.

[0180] The controller 350 may obtain a weight of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 based on the obtained mutual inductance ( S430 ).

[0181] First, the controller 350 may obtain a magnetic channel of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 by using Equation 1 based on the obtained mutual inductance.

[0182] The controller 350 may obtain a weight of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 by using Equation 2 based on the magnetic channel.

[0183] For example, the weight may have a magnitude and direction as a beamforming vector corresponding to the obtained mutual inductance.

[0184] For example, the weights of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 may be different according to the arrangement direction or position of the wireless power receiving device.

[0185] For example, a large weight may mean that the mutual inductance between the receiving coil and the specific antenna of the corresponding transmitting coil unit is large, which may mean that the power transmission efficiency between the receiving coil and the specific antenna of the corresponding transmitting coil unit is high.

[0186] The controller 350 may adjust the supply voltage of each of the power sources 351 to 354 according to the weight of each of the plurality of antennas 311 to 314 of the plurality of transmitting coil units 310 ( S440 ).

[0187] like Figure 15 As shown in FIG, power supplies 351 to 354 may be respectively connected to the multiple antennas 311 to 314 of each of the multiple transmitting coil units 310. Accordingly, the multiple antennas 311 to 314 of each of the multiple transmitting coil units 310 may be respectively driven by the power supplies 351 to 354 connected thereto.

[0188] Each of the multiple antennas 311 to 314 of each of the multiple transmitting coil units 310 can generate transmission power to be transmitted to the wireless power receiving device using the supply voltage supplied from the power supplies 351 to 354. For example, when current flows through the antenna due to the supply voltage supplied from the power supplies 351 to 354, a magnetic field passing through the antenna can be generated in proportion to the flowing current. The strength of this magnetic field can be the magnitude of the transmitted power.

[0189] For example, a heavily weighted antenna can increase the power supply voltage, thereby generating a larger magnetic field. For example, a lightly weighted antenna can reduce the power supply voltage, thereby generating a smaller magnetic field. In this case, the larger magnetic field generated by the heavily weighted antenna can contribute significantly to the generation of received power by the wireless power receiving device. The smaller magnetic field generated by the lightly weighted antenna can contribute less significantly to the generation of received power by the wireless power receiving device.

[0190] Accordingly, the charging efficiency of the wireless power receiving device can be improved by generating a larger magnetic field using an antenna with a large weight (ie, a high power transmission efficiency).

[0191] Alternatively, when the supply voltage supplied to antennas 311 to 314 is the same regardless of the weight, the same magnetic field can be generated in antennas 311 to 314. In this case, the same magnetic field is generated in each antenna 311 to 314 regardless of the weight, but the mutual inductance between antennas 311 to 314 and the receiving coil of the wireless power receiving device is different, and the weights reflecting this inductance are different. Therefore, the power transmission efficiency between antennas 311 to 314 and the receiving coil of the wireless power receiving device is different. Therefore, even when the same magnetic field is generated in each antenna 311 to 314, the magnetic field may contribute differently to the generation of received power by the wireless power receiving device. For example, the magnetic field generated by an antenna with high power transmission efficiency may contribute more to the generation of received power by the wireless power receiving device. For example, the magnetic field generated by an antenna with low power transmission efficiency may contribute less to the generation of received power by the wireless power receiving device.

[0192] The transmission power generated by the adjusted supply voltage in each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 can be transmitted to the wireless power receiving device. The reception power is received based on the transmission power and can be charged in the wireless power receiving device.

[0193] The controller 350 may obtain whether the arrangement of the wireless power receiving device is changed (S450).

[0194] When the wireless power receiving device is freely movable, the wireless power receiving device may be freely movable on the wireless power transmitting device. When the wireless power receiving device is not fixed to the wireless power transmitting device or the fixing force with the wireless power transmitting device is loose, the wireless power receiving device may be freely movable.

[0195] For example, when a user sits down or lies down while carrying a mobile device including a wireless power receiving device in a pocket, the arrangement position or arrangement direction of the wireless power receiving device may be changed.

[0196] For example, the multiple antennas 311 to 314 of each of the multiple transmitting coil units 310 of the wireless power transmitting device or one of the multiple antennas 311 to 314 periodically transmits a confirmation signal, and the wireless power receiving device may transmit the reception strength of the received confirmation signal as a response signal to the wireless power transmitting device. The wireless power transmitting device may obtain the arrangement position or direction of the wireless power receiving device based on the reception strength of one or more of the multiple antennas 311 to 314 of each of the multiple transmitting coil units 310 received from the wireless power receiving device.

[0197] When the arrangement of the wireless power receiving device is changed, the controller 350 may perform S420 to S440 .

[0198] When the arrangement of the wireless power receiving device is not changed, the controller 350 may transmit transmission power from each of the plurality of antennas 311 to 314 of the plurality of transmitting coil units 310 to the wireless power receiving device to charge the wireless power receiving device ( S460 ).

[0199] In an embodiment, the charging efficiency of the wireless power receiving device may be improved by transmitting the maximum transmission power to the wireless power receiving device regardless of the arrangement position or arrangement direction of the wireless power receiving device.

[0200] Figure 18 A wireless power transmission device according to a second embodiment is shown.

[0201] The second embodiment is the same as the first embodiment except for switches 356 to 359. In the second embodiment, the same reference numerals are given to components having the same functions as those in the first embodiment, and detailed descriptions thereof are omitted.

[0202] Reference Figure 18 , the wireless power transmitting device according to the first embodiment may include a plurality of transmitting coil units 310 , a plurality of power supplies 351 to 354 , a plurality of switches 356 to 359 , and a controller 350 .

[0203] The plurality of transmitting coil units 310 may be as follows Figure 8 or Figure 14 Arrange as shown in or in various other ways.

[0204] In the following, for the sake of convenience, Figure 8 The transmitting coil unit 310 shown in FIG. 3 is described in a limited manner.

[0205] The plurality of power supplies 351 to 354 may be respectively connected to the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 .

[0206] The plurality of switches 356 to 359 may be connected between each of the plurality of power supplies 351 to 354 and each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 .

[0207] When the switches 356 to 359 are turned on, the supply voltages of the power sources 351 to 354 may be supplied to the corresponding antennas 311 to 314. When the switches 356 to 359 are turned off, the supply voltages of the power sources 351 to 354 may not be supplied to the corresponding antennas 311 to 314.

[0208] The controller 350 may control the plurality of switches 356 to 359 to supply and block the supply voltage.

[0209] The controller 350 may control the plurality of switches 356 to 359 to selectively select the plurality of antennas 311 to 314 of the plurality of transmitting coil units 310 under certain conditions. Here, the specific condition may be a weight having a low contribution to the generation of received power of the wireless power receiving device among the weights of the plurality of antennas 311 to 314 for each of the plurality of transmitting coil units 310, but is not limited thereto.

[0210] For example, the controller 350 may disconnect the switch connected to the corresponding antenna so that the antenna with a low weight contributing to the generation of received power by the wireless power receiving device is not selected. In this case, the supply voltage of the power supply connected to the corresponding switch is not supplied to the antenna with a low weight contributing to the generation of received power by the wireless power receiving device. As a result, transmit power cannot be transmitted from the corresponding antenna to the wireless power receiving device.

[0211] For example, the controller 350 may turn on the switch connected to the corresponding antenna to select the antenna with the highest weighted contribution to the generation of received power by the wireless power receiving device. In this case, the supply voltage of the power supply connected to the corresponding switch is supplied to the antenna with the highest weighted contribution to the generation of received power by the wireless power receiving device. As a result, transmit power can be transmitted from the corresponding antenna to the wireless power receiving device.

[0212] A threshold value may be set to determine whether the contribution to the generation of received power by the wireless power receiving device is low or high. In this case, when the weight is equal to or greater than the threshold value, the weight may be determined to be a weight that contributes highly to the generation of received power by the wireless power receiving device. When the weight is less than the threshold value, the weight may be determined to be a weight that contributes less to the generation of received power by the wireless power receiving device.

[0213] For example, the threshold value may be set so that 10% to 80% of the total number of antennas 311 to 314 included in the plurality of transmitting units are determined to have a high weighted contribution to the generation of received power for the wireless power receiving device, but the present invention is not limited thereto. When the threshold value is set so that less than 10% of the total number of antennas 311 to 314 included in the plurality of transmitting units are determined to have a high weighted contribution to the generation of received power for the wireless power receiving device, the number of antennas used to transmit transmit power is small, and therefore the wireless power receiving device cannot receive the desired amount of received power, resulting in reduced wireless charging efficiency. When the threshold value is set so that more than 80% of the total number of antennas 311 to 314 included in the plurality of transmitting coil units 310 are determined to have a high weighted contribution to the generation of received power for the wireless power receiving device, the number of antennas used to transmit transmit power to the wireless power receiving device is large, and therefore the number of antennas used to transmit transmit power is correspondingly large, resulting in increased power consumption.

[0214] The controller 350 may obtain whether the arrangement of the wireless power receiving device is changed (S550).

[0215] When the arrangement of the wireless power receiving device is changed, the controller 350 may perform S520 to S540 .

[0216] When the arrangement of the wireless power receiving device is not changed, the controller 350 may transmit transmission power from each of the plurality of antennas 311 to 314 of the plurality of transmitting coil units 310 to the wireless power receiving device to charge the wireless power receiving device ( S560 ).

[0217] Figure 19 is a flowchart for describing an operating method of the wireless power transmission device according to the second embodiment.

[0218] Figure 19 The S510, S520, S530, S550 and S560 in Figure 17 The same as S410, S420, S430, S450 and S460 in Figure 17 It can be easily understood from the relevant description that Figure 19 The following description is omitted.

[0219] Reference Figure 18 and Figure 19 When the controller 350 obtains whether the wireless power receiving device is placed (S510), the controller 350 may obtain a mutual inductance of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 with respect to the wireless power receiving device (S520).

[0220] The controller 350 may obtain a weight of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 based on a mutual inductance of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 with respect to the wireless power receiving apparatus ( S530 ).

[0221] The controller 350 may control the plurality of switches 356 to 359 to selectively select each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 according to the weight of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 ( S540 ).

[0222] For example, each of the weights of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 may be compared with a threshold value.

[0223] As a result of the comparison, if the weight is greater than or equal to the threshold, the controller 350 may turn on the switch connected to the corresponding antenna to select the antenna having the weight greater than or equal to the threshold. Accordingly, the supply voltage of the power supply connected to the corresponding switch is supplied to the corresponding antenna through the corresponding switch 356 to 359, thereby generating transmission power in the corresponding antenna.

[0224] As a result of the comparison, if the weight is less than the threshold, the controller 350 may disconnect the switch connected to the corresponding antenna to prevent the antenna having a weight less than the threshold from being selected. Accordingly, the supply voltage of the power supply connected to the corresponding switch is not supplied to the corresponding antenna through the corresponding switch, so that no transmission power is generated from the corresponding antenna.

[0225] Therefore, among the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 , transmission power may be selectively transmitted to the wireless power receiving device through an antenna obtaining a weight greater than or equal to a threshold value.

[0226] In the case of an antenna that obtains a weight less than a threshold, since the contribution of the transmitted power to the generation of received power of the wireless power receiving device is low even when the transmitted power is transmitted to the wireless power receiving device through the antenna, the power consumption of the wireless power transmitting device can be reduced by preventing the transmitted power from being transmitted to the wireless power receiving device.

[0227] Figure 20 A wireless power transmission device according to a third embodiment is shown.

[0228] The third embodiment is the same as the second embodiment except for the voltage regulators 361 to 364. In the third embodiment, the same reference numerals are given to components having the same functions as those in the second embodiment, and detailed descriptions thereof are omitted.

[0229] Reference Figure 20 , the wireless power transmitting device according to the first embodiment may include a plurality of transmitting coil units 310 , a plurality of power supplies 351 to 354 , a plurality of switches 356 to 359 , a plurality of voltage regulators 361 to 364 , and a controller 350 .

[0230] The plurality of transmitting coil units 310 may be as follows Figure 8 or Figure 14 Arrange as shown in or in various other ways.

[0231] In the following, for the sake of convenience, Figure 8 The transmitting coil unit 310 shown in FIG. 3 is described in a limited manner.

[0232] The plurality of power supplies 351 to 354 may be respectively connected to the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 .

[0233] The plurality of switches 356 to 359 may be connected to the plurality of power supplies 351 to 354 and the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 , respectively.

[0234] A plurality of voltage regulators 361 to 364 may be connected between each of the plurality of power supplies 351 to 354 and each of the plurality of switches 356 to 359. Although not shown, the plurality of voltage regulators 361 to 364 may be connected between the plurality of switches 356 to 359 and the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units, respectively.

[0235] The controller 350 may control the plurality of switches 356 to 359 and the plurality of voltage regulators 361 to 364 .

[0236] The controller 350 may first control the plurality of switches 356 to 359 and then control the plurality of voltage regulators 361 to 364 .

[0237] For example, the controller 350 may control the plurality of switches 356 to 359 to selectively select the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 based on the weight of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 for the wireless power receiving device, and then control the voltage regulators 361 to 364 to adjust the supply voltage supplied to the selectively selected antennas based on the number of selectively selected antennas and the weight of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 for the wireless power receiving device. Here, the voltage regulators 361 to 364 under the control of the controller 350 may be the voltage regulators 361 to 364 connected to the turned-on switches 356 to 359.

[0238] For example, when the number of the plurality of transmitting coil units 310 is 10 and the number of the plurality of antennas 311 to 314 of each of the transmitting coil units 310 is 10, a total of 100 antennas may be provided.

[0239] In this case, the 50 switches 356 to 359 connected to the 50 antennas, respectively, may be turned on to select the 50 antennas based on the weights of the multiple antennas 311 to 314 of each of the plurality of transmitting coil units 310 for the wireless power receiving device. Thereafter, the supply voltages of the voltage regulators 361 to 364 connected to the 50 switches 356 to 359, respectively, may be adjusted based on information indicating that the 50 antennas are turned on and the weights of the multiple antennas 311 to 314 of each of the plurality of transmitting coil units 310 for the wireless power receiving device.

[0240] The controller 350 may obtain whether the arrangement of the wireless power receiving device is changed (S660).

[0241] When the arrangement of the wireless power receiving device is changed, the controller 350 may perform S620 to S650 .

[0242] When the arrangement of the wireless power receiving device is not changed, the controller 350 may transmit transmission power from each of the plurality of antennas 311 to 314 of the plurality of transmitting coil units 310 to the wireless power receiving device to charge the wireless power receiving device ( S670 ).

[0243] Figure 21 is a flowchart for describing an operating method of the wireless power transmitting apparatus according to the third embodiment.

[0244] Figure 21 The S610, S620, S630, S640, S660 and S670 in Figure 19The same as S510, S520, S530, S540, S550 and S560 in Figure 19 It can be easily understood from the relevant description that Figure 21 The following description is omitted.

[0245] Reference Figure 20 and Figure 21 When the controller 350 obtains whether the wireless power receiving device is placed (S610), the controller 350 may obtain a mutual inductance of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 with respect to the wireless power receiving device (S620).

[0246] The controller 350 may obtain a weight of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 based on a mutual inductance of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 with respect to the wireless power receiving apparatus ( S630 ).

[0247] The controller 350 may control the plurality of switches 356 to 359 to selectively select each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 according to the weight of each of the plurality of antennas 311 to 314 of each of the plurality of transmitting coil units 310 ( S640 ).

[0248] The controller 350 may control the voltage adjusters 361 to 364 to adjust the supply voltage supplied to the selectively selected antennas based on the number of the selectively selected antennas and the weight of each of the selectively selected antennas ( S650 ).

[0249] For example, when 50 antennas are selectively selected from among the 100 antennas 311 to 314 , the controller 350 may control the voltage adjusters 361 to 364 respectively connected to the 50 antennas to adjust the supply voltages supplied to the 50 antennas.

[0250] The supply voltages of the power sources 351 to 354 are input to the voltage regulators 361 to 364 , and the voltage regulators 361 to 364 may adjust the corresponding supply voltages under the control of the controller 350 .

[0251] For example, the voltage regulators 361 to 364 may be adjusted such that the supply voltage increases as the weight is greater, but is not limited thereto.

[0252] Figure 22 A state is shown in which two magnetic field loops are formed using four transmitting coil units when the receiving coil of the wireless power receiving device is provided on a plurality of transmitting coils to face the planes of the receiving coils.

[0253] like Figure 22 As shown in , when the receiving coil of the wireless power receiving device is parallel to or opposite to the same plane on which the plurality of transmitting coil units 310a to 310d are arranged, multiple antennas of each of some transmitting coil units among the plurality of transmitting coil units 310a to 310d can be used to form first and second magnetic field loops 371 and 372 in opposite directions. For example, the antennas of at least two transmitting coil units can be used to generate the first magnetic field loop 371.

[0254] For example, the antennas of at least two transmitting coil units may be used to generate the second magnetic field loop 372. In this manner, the phenomenon of amplification caused by the magnetic field generated by the antennas of two or more transmitting coil units is called magnetic beamforming.

[0255] For example, a magnetic field may be generated in a counterclockwise direction in the first magnetic field loop 371 , and a magnetic field may be generated in a clockwise direction in the second magnetic field loop 372 .

[0256] Therefore, since the magnetic field brought by the first magnetic field loop 371 and the magnetic field brought by the second magnetic field loop 372 experience magnetic linkage with the receiving coil of the wireless power receiving device, the received power of the wireless power receiving device can be further increased, thereby improving the charging efficiency of the power receiver.

[0257] The first magnetic field loop 371 and the second magnetic field loop 372 may be formed through the following antenna operations.

[0258] For example, when current flows clockwise through a specific antenna 382 among the multiple antennas of the first transmitting coil unit 310a, a first magnetic field can be generated that extends from the upper side of the specific antenna 382 through the specific antenna 382 to the lower side of the specific antenna 382. The specific antenna 382 can be an antenna rotated 45 degrees relative to the horizontal plane. For example, when current flows counterclockwise through a specific antenna 381 among the multiple antennas of the second transmitting coil unit 310b, a second magnetic field can be generated that extends from the lower side of the specific antenna 381 through the specific antenna 381 to the upper side of the specific antenna 381. The specific antenna 381 can be an antenna rotated 135 degrees relative to the horizontal plane. Accordingly, the first and second magnetic fields can form a first magnetic field loop 371 that forms a magnetic field beam through the receiving coil of the wireless power receiving device.

[0259] For example, when current flows counterclockwise through a specific antenna 383 among the multiple antennas of the third transmitting coil unit 310c, a third magnetic field can be generated that extends from the bottom side of the specific antenna 383 through the specific antenna 383 to the top side of the specific antenna 383. The specific antenna 383 may be an antenna rotated 45 degrees relative to the horizontal plane. When current flows clockwise through a specific antenna 384 among the multiple antennas of the fourth transmitting coil unit 310d, a fourth magnetic field can be generated that extends from the top side of the specific antenna 384 through the specific antenna 384 to the bottom side of the specific antenna 384. The specific antenna 384 may be an antenna rotated 135 degrees relative to the horizontal plane. Accordingly, the third and fourth magnetic fields can form a second magnetic field loop 372 that forms a magnetic field beam through the receiving coil of the wireless power receiving device.

[0260] Although Figure 22 3 , the first magnetic field loop 371 or the second magnetic field loop 372 is illustrated as being formed by the transmitting coil units 310 a to 310 d adjacent to each other, but the first magnetic field loop 371 or the second magnetic field loop 372 may be formed by two or more transmitting coil units that are not adjacent to each other.

[0261] Figure 23 A state is shown in which one magnetic field loop is formed using four transmitting coil units when the receiving coil of the wireless power receiving device is disposed on a plurality of transmitting coils to be perpendicular to the planes of the receiving coils.

[0262] like Figure 23 As shown in , when the receiving coil of the wireless power receiving device is arranged perpendicular to the same plane on which the multiple transmitting coil units 310a to 310d are arranged, multiple antennas of each of some transmitting coil units among the multiple transmitting coil units 310a to 310d can be used to form a magnetic field loop 375 that passes through the receiving coil of the wireless power receiving device in one direction.

[0263] For example, antennas of at least four transmitting coil units 310a to 310d may be used to generate the magnetic field loop 375. In this way, the phenomenon of amplification caused by the magnetic field generated by the antennas of four or more transmitting coil units 310a to 310d is called magnetic beamforming.

[0264] For example, the magnetic field loop 375 may pass through the receiving coil of the wireless power receiving device in a clockwise or counterclockwise direction.

[0265] The magnetic field loop 375 can be formed by the following antenna operation.

[0266] When current flows clockwise through the specific antenna 386 of the first transmitting coil unit 310a, a first magnetic field is generated that passes from the upper side of the specific antenna 386 to the lower side. The specific antenna 386 may be an antenna rotated 45 degrees relative to the horizontal plane. When current flows clockwise through the specific antenna 387 of the second transmitting coil unit 310b, a second magnetic field is generated that passes from the left side of the specific antenna 387 to the right side. The specific antenna 387 may be an antenna rotated 90 degrees relative to the horizontal plane. When current flows clockwise through the specific antenna 388 of the third transmitting coil unit 310c, a third magnetic field is generated that passes from the left side of the specific antenna 388 to the right side. The specific antenna 388 may be an antenna rotated 90 degrees relative to the horizontal plane. When current flows counterclockwise through the specific antenna 389 of the fourth transmitting coil unit 310d, a fourth magnetic field is generated that passes from the lower side of the specific antenna 389 to the upper side. The specific antenna 389 may be an antenna rotated 135 degrees relative to the horizontal plane. Accordingly, a magnetic field loop 375 for magnetic field beamforming passing through the receiving coil of the wireless power receiving device may be formed by the first to fourth magnetic fields.

[0267] Figure 22 The first magnetic field loop 371 and the second magnetic field loop 372 shown in FIG. Figure 23 The magnetic field loop 375 shown in FIG. 3 may be a magnetic field amplified by a beamforming method.

[0268] Figure 24 The power transmission efficiency in the comparative example and the embodiment is shown.

[0269] exist Figure 24 In the graph, the horizontal axis represents the rotation angle, and the vertical axis represents the power transmission efficiency. The rotation angle refers to the rotation angle of the receiving coil of the wireless power receiving device. When the receiving coil of the wireless power receiving device is arranged parallel to the horizontal plane, 0 degrees can be defined. Figure 24 The power transmission efficiency when the receiving coil of the wireless power receiving device is rotated from 0 degrees to 180 degrees relative to the horizontal plane is shown.

[0270] exist Figure 24 , the comparative example is a transmitting coil unit including a single antenna having a planar structure, and the embodiment is a transmitting coil unit including a plurality of antennas having a multi-dimensional plane ( Figure 8 310 and Figure 14 341 to 343 in the text).

[0271] from Figure 24It can be seen that in the comparative example, when the receiving coil of the wireless power receiving device is 0 degrees or 180 degrees relative to the horizontal plane, the power transmission efficiency is the largest, and when the receiving coil of the wireless power receiving device is rotated 90 degrees relative to the horizontal plane, the power transmission efficiency is the smallest.

[0272] Furthermore, it can be seen that in the embodiment, when the receiving coil of the wireless power receiving device is positioned within a range between 0 degrees and 180 degrees relative to the horizontal plane, nearly uniform power transmission efficiency is achieved. In other words, it can be seen that in the embodiment, even when the receiving coil of the wireless power receiving device is positioned at 90 degrees relative to the horizontal plane, the power transmission efficiency does not decrease.

[0273] Even when the receiving coil of the wireless power receiving device rotates relative to the horizontal plane, the multiple antennas can contribute differently to the generation of received power by the wireless power receiving device. As described above, the multiple antennas contribute differently to the generation of received power by the wireless power receiving device, but even when the receiving coil of the wireless power receiving device rotates, the average value of the contribution remains approximately the same, resulting in approximately uniform power transmission efficiency.

[0274] Hereinafter, mutual inductance according to movement of the transmission coil unit of the wireless power transmitting device caused by the arrangement direction of the reception coil of the wireless power receiving device will be described.

[0275] Figure 25a and Figure 25b The mutual inductances of the first to third antennas of the transmission coil unit of the wireless power transmitting device relative to the wireless power receiving device when the wireless power receiving device is positioned at 0 degrees are shown. Figure 26a and Figure 26b The mutual inductances of the first to third antennas of the transmitting coil unit of the wireless power transmitting device relative to the wireless power receiving device when the wireless power receiving device is disposed at 45 degrees are shown. Figure 27a and Figure 27b The mutual inductances of the first to third antennas of the transmitting coil unit of the wireless power transmitting device relative to the wireless power receiving device when the wireless power receiving device is disposed at 90 degrees are shown.

[0276] exist Figures 25a to 27b d1, d2, and d3 are distances moved to the left from the reference point (0) of the transmitting coil unit. d2 is greater than d1, and d3 is greater than d2.

[0277] The transmitting coil unit may include first to third antennas: the first antenna 391 may be parallel to the horizontal plane, the second antenna 392 may be rotated 45 degrees relative to the horizontal plane, and the third antenna 393 may be rotated 90 degrees relative to the horizontal plane.

[0278] For example, when the receiving coil of the wireless power receiving device is set at 0 degrees or 45 degrees ( Figure 25b and Figure 26b ), as the transmitting coil unit moves from the reference point (0) to the third distance d3 by the first distance d1, the mutual inductance of the first antenna of the transmitting coil unit decreases. On the other hand, when the receiving coil of the wireless power receiving device is set at 90 degrees ( Figure 27b ), the first antenna of the transmitting coil unit may have a maximum mutual inductance at the first distance d1 and the second distance d2 and a minimum mutual inductance at the reference point (0).

[0279] For example, when the receiving coil of the wireless power receiving device is set at 0 degrees or 90 degrees ( Figure 25b and Figure 27b ), as the transmitting coil unit moves from the reference point (0) to the third distance d3 by the first distance d1, the mutual inductance of the second antenna of the transmitting coil unit decreases. On the other hand, it can be seen that when the receiving coil of the wireless power receiving device is set at 45 degrees ( Figure 26b ), as the transmitting coil unit moves from the reference point (0) by the first distance d1 to the third distance d3, the mutual inductance of the second antenna of the transmitting coil unit hardly changes.

[0280] For example, when the receiving coil of the wireless power receiving device is set at 0 degrees ( Figure 25b ), the third antenna of the transmitting coil unit may have a maximum mutual inductance at the first distance d1 and the second distance d2, and a minimum mutual inductance at the reference point (0). On the other hand, when the receiving coil of the wireless power receiving device is arranged at 45 degrees or 90 degrees ( Figure 26b and Figure 27b ), as the transmitting coil unit moves from the reference point (0) by the first distance d1 to the third distance d3, the mutual inductance of the third antenna of the transmitting coil unit can be reduced.

[0281] from Figures 25a to 27b As can be seen, as the arrangement direction of the receiving coil of the wireless power receiving device changes, the mutual inductance with each antenna of the transmitting coil of the wireless power transmitting device changes. This embodiment includes multiple transmitting coil units, each of which includes multiple antennas in a three-dimensional plane having a three-dimensional structure, thereby ensuring constant power transmission efficiency even when the wireless power receiving device is changed in various positions or directions.

[0282] The above detailed description should not be interpreted as limiting in any respect and should be regarded as illustrative. The scope of the embodiments should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent range of the embodiments are included in the scope of the embodiments.

[0283] Industrial Applicability

[0284] The embodiments may be variously applied to all industries such as IT, vehicle, railway, and home appliance industries, as well as mobile devices.

Claims

1. A wireless power transmission device, comprising: Multiple transmitting coil units, Wherein, each of the plurality of transmitting coil units comprises a plurality of antennas of a multi-dimensional plane having a three-dimensional structure; a power source connected to the plurality of antennas of each of the plurality of transmitting coil units, respectively; and controller, wherein the plurality of antennas are configured to generate a magnetic field passing through at least one or more planes of the multi-dimensional planes to transmit transmission power to the wireless power receiving device, wherein the plurality of antennas are formed by coils independent of each other, Wherein, the controller is configured as follows: When the wireless power receiving device is disposed on the wireless power transmitting device, obtaining a mutual inductance of each of the plurality of antennas of each of the plurality of transmitting coil units with respect to the wireless power receiving device; obtaining a weight for each of the plurality of antennas of each of the plurality of transmitting coil units based on the obtained mutual inductance, wherein the weight is a beamforming vector corresponding to the obtained mutual inductance; and The supply voltage of the power supply is adjusted according to the obtained weight.

2. The wireless power transmission device according to claim 1, wherein Each of the plurality of transmitting coil units includes a plurality of antennas having a multi-dimensional plane disposed between 0 degrees and 359 degrees with respect to a specific axis.

3. The wireless power transmission device according to claim 2, wherein: The specific axes of the plurality of transmitting coil units have different directions.

4. The wireless power transmission device according to claim 1, wherein Each of the plurality of transmitting coil units includes a plurality of antennas having multi-dimensional planes respectively disposed between 0 degrees and 359 degrees with respect to a plurality of axes.

5. The wireless power transmission device according to claim 1, wherein The plurality of antennas are formed of a single coil in which the plurality of antennas are connected to each other.

6. The wireless power transmission device according to claim 5, wherein: The obtained weight differs depending on an arrangement direction of the wireless power receiving device.

7. The wireless power transmission device according to claim 5, wherein: The obtained weight differs depending on an arrangement position of the wireless power receiving device.

8. The wireless power transmission device according to claim 5, wherein: The controller is configured to increase the supply voltage of the power supply as the weight obtained for the antenna is larger.

9. The wireless power transmission device according to claim 4, further comprising: A switch is connected between the antenna and the power supply.

10. The wireless power transmission device according to claim 9, wherein: The controller is configured to: When the wireless power receiving device is disposed on the wireless power transmitting device, obtaining a mutual inductance of each of the plurality of antennas of each of the plurality of transmitting coil units with respect to the wireless power receiving device; obtaining a weight of each of the plurality of antennas of each of the plurality of transmitting coil units based on the obtained mutual inductance; and The switch is controlled to selectively select the plurality of antennas of each of the plurality of transmitting coil units according to the obtained weight, to which a supply voltage of the power supply is supplied.

11. The wireless power transmission device according to claim 9, further comprising: A voltage regulator is connected between the power supply and the switch.

12. The wireless power transmission device according to claim 11, wherein The controller is configured to: When the wireless power receiving device is disposed on the wireless power transmitting device, obtaining a mutual inductance of each of the plurality of antennas of each of the plurality of transmitting coil units with respect to the wireless power receiving device; obtaining a weight of each of the plurality of antennas of each of the plurality of transmitting coil units based on the obtained mutual inductance; controlling the switch to selectively select the plurality of antennas of each of the plurality of transmitting coil units according to the obtained weight, the supply voltage of the power supply being supplied to the antennas; and The voltage adjuster is controlled to adjust a supply voltage supplied to the selectively selected antennas based on the number of the selectively selected antennas and the weights of the selectively selected antennas.

13. The wireless power transmission device according to claim 1, wherein The plurality of transmitting coil units are arranged on the same plane.

14. The wireless power transmission device according to claim 13, wherein: When the planes of the receiving coils of the wireless power receiving device are arranged to face the same plane, a first magnetic field loop passing through the receiving coil of the wireless power receiving device in a counterclockwise direction is formed by one of the multiple antennas of some of the multiple transmitting coil units, and a second magnetic field loop passing through the receiving coil of the wireless power receiving device in a clockwise direction is formed by one of the multiple antennas of other of the multiple transmitting coil units.

15. The wireless power transmission device according to claim 13, wherein When the plane of the receiving coil of the wireless power receiving device is arranged perpendicular to the same plane, a magnetic field loop passing through the receiving coil of the wireless power receiving device in one direction is formed by one of the multiple antennas of at least four transmitting coil units among the multiple transmitting coil units.

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