WO2020180073A1

WO2020180073A1 - Wireless power transmission device for wirelessly transmitting power

Info

Publication number: WO2020180073A1
Application number: PCT/KR2020/002971
Authority: WO
Inventors: 박재현; 이종민; 김동조; 하민철; 김광섭; 김기현
Original assignee: 삼성전자 주식회사
Priority date: 2019-03-05
Filing date: 2020-03-02
Publication date: 2020-09-10
Also published as: KR102691761B1; KR20200106786A

Abstract

A wireless power transmission device according to various embodiments can comprise: a power source; a first ferrite having a sheet form; a first transmission coil which is positioned on the first ferrite and which forms a magnetic field by using power provided from the power source; a second transmission coil which is positioned on the first transmission coil and which forms a magnetic field by using the power provided from the power source; and a second ferrite which is positioned on the inside of the first transmission coil and on the inside of the second transmission coil and which has a height larger than the sum of the heights of the first transmission coil and the second transmission coil. Additional various embodiments are possible.

Description

Wireless power transmission device that transmits power wirelessly

Various embodiments of the present disclosure relate to a wireless power transmission apparatus for wirelessly transmitting power.

For many people living in modern times, portable digital communication devices have become an essential element. Consumers want to be provided with a variety of high-quality services they want anytime, anywhere. In addition, due to the recent IoT (Internet of Thing), various sensors, home appliances, and communication devices that exist in our daily life are becoming one network. In order to smoothly operate these various sensors, a wireless power transmission system is required.

There are magnetic induction, magnetic resonance, and electromagnetic wave methods for wireless power transmission. The magnetic induction or magnetic resonance method is advantageous for charging an electronic device located relatively close to the wireless power transmission device. The electromagnetic wave method is more advantageous for long-distance power transmission up to several meters in magnetic induction or magnetic resonance method. The electromagnetic wave method is mainly used for long-distance power transmission, and power can be delivered most efficiently by grasping the exact location of a power receiver in a long distance.

A wireless power transmission device for charging a smart phone generally includes a spiral-shaped coil, and the transmission coil and the reception coil are designed to have almost the same size for strong coupling. The transmission efficiency increases as the resistance of the coil decreases and the coupling coefficient increases.In order to secure a relatively high coupling coefficient (for example, a coupling coefficient of 0.5 or more), the size of the transmitting coil and the receiving coil is 1:1. It can be designed to have a size close to.

When the transmitting coil and the receiving coil are designed to have almost the same size, if the position of the electronic device slightly deviates from the preset charging position on the wireless power transmission device, the power transmission efficiency is greatly reduced and normal charging becomes impossible. . When the power transmission efficiency is low, power loss from the receiving coil increases, and heat may be generated in the electronic device. If the size of the transmitting coil is increased to secure the degree of freedom of the charging position, the magnetic field generated by the transmitting coil is excited by the conductor included in the electronic device, thereby forming unnecessary induced current, resulting in additional power loss and heat generation. There is a problem with this occurring.

A wireless power transmission apparatus according to various embodiments may include at least one transmission coil and a ferrite positioned inside the at least one transmission coil. The height of the ferrite may be greater than the height of at least one transmission coil, and when the electronic device is disposed on the wireless power transmission device, the ferrite and the receiving coil in the electronic device may be close.

According to various embodiments, a wireless power transmission apparatus includes a power source, a first ferrite having a sheet form, a first ferrite positioned on the first ferrite, and forming a magnetic field using power provided from the power source. A transmission coil, a second transmission coil positioned on the first transmission coil and forming a magnetic field using the power provided from the power source, and an inner side of the first transmission coil and the second transmission It may include a second ferrite located inside the coil and having a height greater than the sum of the height of the first transmission coil and the height of the second transmission coil.

According to various embodiments, a wireless power transmission apparatus includes a power source, a first ferrite having a sheet form, a first ferrite positioned on the first ferrite, and forming a magnetic field using power provided from the power source. A transmission coil, a second transmission coil positioned on the first transmission coil and forming a magnetic field using the power provided from the power source, and an inner side of the first transmission coil and the second transmission And a second ferrite positioned inside the coil, and an outer diameter of the first transmission coil may be larger than an outer diameter of the second transmission coil.

According to various embodiments, a structure for generating a magnetic field includes a first ferrite having a sheet form, a first transmission coil positioned on the first ferrite and forming a magnetic field using power provided from the outside, A second transmission coil that is located on the first transmission coil and forms a magnetic field by using the power provided from the outside, and is located inside the first transmission coil and inside the second transmission coil. And a second ferrite having a height greater than the sum of the height of the first transmission coil and the height of the second transmission coil.

According to various embodiments, a wireless power transmission apparatus including at least one coil and a ferrite positioned inside the at least one coil may be provided. The height of the ferrite may be higher than the size of the transmitting coil. Accordingly, when the electronic device is disposed on the wireless power transmission device, the ferrite may be close to the receiving coil in the electronic device. Accordingly, even if each of the at least one transmission coil is manufactured in a relatively large area, the magnetic field may be concentrated to the center of the transmission coil. According to the structure, while the degree of freedom of the charging position increases, the heat generation problem can be alleviated.

1 is a block diagram of an apparatus for transmitting power wirelessly and an electronic device according to various embodiments of the present disclosure.

2A is a diagram illustrating a wireless power transmission device and an electronic device according to various embodiments of the present disclosure.

2B is a detailed block diagram of a power transmission circuit and a power reception circuit according to various embodiments.

3A is a plan view of a coil according to a comparative example for comparison with various embodiments.

3B is a side view of a coil according to a comparative example for comparison with various embodiments.

3C is a side view showing an arrangement of a transmitting coil and an electronic device according to a comparative example.

4A is a plan view illustrating a transmission coil and a ferrite according to various embodiments.

4B is a side view illustrating a transmission coil and a ferrite according to various embodiments.

4C is a side view illustrating a transmission coil and a ferrite according to various embodiments.

5A is a plan view illustrating a structure of a plurality of coils according to various embodiments.

5B are plan views illustrating a structure of a plurality of coils according to various embodiments.

6A is a diagram illustrating a coil connection relationship in a wireless power transmission apparatus according to various embodiments.

6B is a diagram illustrating a coil connection relationship in a wireless power transmission apparatus according to various embodiments.

7A is a diagram illustrating a coil connection relationship in a wireless power transmission apparatus according to various embodiments.

7B is a diagram illustrating a coil connection relationship in a wireless power transmission apparatus according to various embodiments.

8 is a side view illustrating a transmission coil and a ferrite according to various embodiments.

9 illustrates a transmission coil according to various embodiments.

10A illustrates a transmission coil according to a comparative example for comparison with various embodiments.

10B is a diagram illustrating a transmission coil and a ferrite according to various embodiments.

10C shows an experimental environment for testing a coupling coefficient according to a degree of misalignment.

10D are graphs showing a coupling coefficient measured according to an x-axis misalignment degree for a transmission coil according to a comparative example and a transmission coil according to various embodiments.

11A is a diagram illustrating coil positions of electronic devices that wirelessly receive power according to various embodiments of the present disclosure.

11B is a diagram illustrating an arrangement of a transmitting coil and a ferrite according to various embodiments.

11C are coupling coefficients measured according to various x-axis misalignment degrees for each structure according to a comparative example and various embodiments when the y-axis misalignment degree is 0.

11D is a diagram illustrating coupling coefficients measured according to various degrees of x-axis misalignment for each structure according to a comparative example and various embodiments when the y-axis misalignment degree is 6 mm.

Referring to FIG. 1, the apparatus 100 for transmitting power wirelessly according to various embodiments may wirelessly transmit power 161 to the electronic device 150. The wireless power transmission device 100 may transmit power 161 to the electronic device 150 according to various charging methods. For example, the apparatus 100 for transmitting power wirelessly may transmit the power 161 according to an induction method. In the case where the wireless power transmission device 100 is based on the induction method, the wireless power transmission device 100 may include, for example, a power source, a DC-AC conversion circuit, an amplifying circuit, an impedance matching circuit, at least one capacitor, and at least one It may include a coil, a communication modem circuit, and the like. At least one capacitor may form a resonance circuit together with at least one coil. The wireless power transmission apparatus 100 may be implemented in a manner defined in a wireless power consortium (WPC) standard (or Qi standard). For example, the wireless power transmission apparatus 100 may transmit the power 161 according to the resonance method. In the case of the resonance method, the wireless power transmission apparatus 100 includes, for example, a power source, a DC-AC conversion circuit, an amplifying circuit, an impedance matching circuit, at least one capacitor, at least one coil, an out-band communication circuit ( Example: Bluetooth low energy (BLE) communication circuit). At least one capacitor and at least one coil may constitute a resonance circuit. The apparatus 100 for transmitting power wirelessly may be implemented in a manner defined in the Alliance for Wireless Power (A4WP) standard (or air fuel alliance (AFA) standard). The wireless power transmission apparatus 100 may include a coil capable of generating an induced magnetic field when a current flows according to a resonance method or an induction method. The process of generating the induced magnetic field by the wireless power transmission apparatus 100 may be expressed as that the wireless power transmission apparatus 100 transmits the power 161 wirelessly. In addition, the electronic device 150 may include a coil in which induced electromotive force is generated by a magnetic field that changes in size according to time formed around it. The process of generating the induced electromotive force through the coil may be expressed as the electronic device 150 wirelessly receiving the power 161.

The wireless power transmission apparatus 100 according to various embodiments of the present disclosure may perform communication with the electronic device 150. For example, the apparatus 100 for transmitting power wirelessly may communicate with the electronic device 150 according to an in-band method. The wireless power transmission device 100 or the electronic device 150 may change the load (or impedance) of data to be transmitted according to, for example, an on/off keying modulation method. The wireless power transmission device 100 or the electronic device 150 may determine the data transmitted from the counterpart device by measuring a load change (or impedance change) based on a change in the amount of current, voltage, or power of the coil. have. For example, the wireless power transmission apparatus 100 may perform communication with the electronic device 150 according to an out-band method. The wireless power transmission device 100 or the electronic device 150 may transmit and receive data using a communication circuit (eg, a BLE communication module) separately provided with a coil or patch antenna.

In this document, the wireless power transmission device 100 or the electronic device 150 performing a specific operation is a variety of hardware included in the wireless power transmission device 100 or the electronic device 150, for example, a processor. It may mean that a control circuit, a coil, or a patch antenna performs a specific operation. Alternatively, when the wireless power transmission apparatus 100 or the electronic device 150 performs a specific operation, it may mean that the processor controls other hardware to perform a specific operation. Alternatively, when the wireless power transmission device 100 or the electronic device 150 performs a specific operation, a specific operation that has been stored in a storage circuit (eg, memory) of the wireless power transmission device 100 or electronic device 150 As an instruction to be executed is executed, it may mean causing a processor or other hardware to perform a specific operation.

Referring to FIG. 2A, a wireless power transmission apparatus 100 according to various embodiments includes a control circuit 102, a communication circuit 103, a memory 105, a power source 106, or a power transmission circuit 109. It may include at least one of. The electronic device 150 according to various embodiments may include at least one of a charger, a control circuit 152, a communication circuit 153, a battery 154, a memory 156, or a power receiving circuit 159. Can include.

The power transmission circuit 109 according to various embodiments may wirelessly transmit the power 161 according to at least one of an induction method, a resonance method, and an electromagnetic wave method. Detailed configurations of the power transmission circuit 109 and the power reception circuit 159 will be described in more detail with reference to FIGS. 2A and 2B. The control circuit 102 can control the overall operation of the wireless power transmission device 100. For example, the control circuit 102 determines whether to transmit the power 161, controls the magnitude of the power 161, or at least one function of the electronic device 150 (e.g., charging Start or stop charging) can also be controlled. The control circuit 102 or the control circuit 152 is a general-purpose processor such as a CPU, a mini computer, a microprocessor, a micro controlling unit (MCU), a field programmable gate array (FPGA), etc. It can be implemented, and there is no limit to its kind. The control circuit 102 may transmit and receive data to and from the electronic device 150 through the communication circuit 103. The data can be used to control wireless power transmission/reception. The communication circuit 103 and the communication circuit 153 are implemented as, for example, an out-band communication type communication circuit (eg, a Bluetooth communication module or an NFC communication module), or an in-band communication type communication circuit. Can be. In the case of the in-band communication method, the communication circuit 153 includes, for example, a switch connected directly to the coil of the power receiving circuit 159 or through another element, and a dummy connected directly to the coil or through other elements through the switch. It may include a load (eg, a dummy resistor or a dummy capacitor). The communication circuit 103 may check information based on a change in voltage or current applied to the coil in the power transmission circuit 109 detected during the on/off process of the switch.

The power receiving circuit 159 according to various embodiments may wirelessly receive power from the power transmission circuit 109 according to at least one of an induction method, a resonance method, and an electromagnetic wave method. The power receiving circuit 159 may perform power processing of rectifying the power of the received AC waveform into a DC waveform, converting a voltage, or regulating power. The charger 151 may charge the battery 154 using the received regulated power (eg, DC power). The charger 151 may adjust at least one of a voltage or a current of the received power and transmit it to the battery 154. The battery 154 may store power and transfer it to other hardware. Although not shown, a power management integrated circuit (PMIC) (not shown) may receive power from the power receiving circuit 159 and transmit it to other hardware, or may receive power from the battery 154 and transmit it to other hardware. .

The control circuit 152 may control the overall operation of the electronic device 150. The memory 156 may store instructions for performing overall operations of the electronic device 150. In the memory 105, instructions for performing the overall operation of the wireless power transmission device 100 may be stored, or a relationship between the information acquired through the communication circuit 103 and the amount of power to be transmitted may be stored. A lookup table or equation information about a relationship between the obtained information and the amount of power to be transmitted may be stored. The memory 105 or the memory 156 may be implemented in various forms such as read only memory (ROM), random access memory (RAM), or flash memory, and there is no limitation on the form of implementation.

In various embodiments, the power transmission circuit 109 may include a power adapter 211, a power generation circuit 212, a coil 213, and a matching circuit 214. The power adapter 211 may receive power from the power source 106 and provide it to the power generation circuit 212. The adapter 211 may be, for example, a power interface, and may not be included in the wireless power transmission apparatus 100 depending on implementation. The power generation circuit 212 may convert the received power into an AC waveform, for example, and/or amplify and transfer the received power to the coil 213. The frequency of the AC waveform may be set to 100 to 205 kHz or 6.78 MHz or the like according to the standard, but there is no limitation. The power generation circuit 212 may also include an inverter. For example, the inverter may be a full-bridge inverter or a half-bridge inverter, but the type is not limited. When power is applied to the coil 213, an induced magnetic field that changes in size with time may be formed from the coil 213, and accordingly, power may be transmitted wirelessly. Although not shown, at least one capacitor constituting the resonance circuit together with the coil 213 may be further included in the power transmission circuit 109. The matching circuit 214 changes at least one of the capacitance or reactance of the circuit connected to the coil 213 according to the control of the control circuit 102, so that the power transmission circuit 109 and the power reception circuit 159 are Impedance matching can be made. Induction electromotive force may be generated in the coil 221 of the power receiving circuit 159 by a magnetic field that changes in size according to the time formed around it, and accordingly, the power receiving circuit 159 may receive power wirelessly. . The rectifying circuit 222 may rectify the power of the received AC waveform. The converting circuit 223 may adjust the voltage of the rectified power and transmit it to the PMIC or charger. The power receiving circuit 159 may further include a regulator, or the converting circuit 223 may be replaced with a regulator. The matching circuit 224 changes at least one of the capacitance or reactance of the circuit connected to the coil 221 under the control of the control circuit 152, so that the power transmission circuit 109 and the power reception circuit 159 are Impedance matching can be made.

In various embodiments, the number of coils 213 may be one or more. When there are a plurality of coils 213, the coils may be connected in series or in parallel with each other. Various implementation forms of the coil 213 will be described in more detail later.

3A is a top view of a coil according to a comparative example for comparison with various embodiments. 3B is a side view of a coil according to a comparative example for comparison with various embodiments.

As shown in FIGS. 3A and 3B, the transmission coil 301 according to the comparative example may be positioned on the ferrite 302. The ferrite 302 may have a sheet shape. The ferrite 302 may shield a magnetic field formed from the transmission coil 301. The ferrite 302 can prevent the magnetic field from flowing into the surface opposite to the surface on which the transmission coil 301 is disposed. In addition, the ferrite 302 may increase the inductance of the transmitting coil 301 and may reduce the influence of an external conductor on the transmitting coil 301. The transmission coil 301 may have a spiral shape, but there is no limitation on the implementation type.

According to the comparative example, the size of the transmitting coil 301 may be substantially the same as the size of the receiving coil 322 in the electronic device 150. Here, when the sizes are substantially the same, the difference between the sizes may be less than or equal to a threshold. As the difference in size between the transmitting coil 301 and the receiving coil 322 is smaller, the power transmission efficiency between the transmitting coil 301 and the receiving coil 322 may be higher. The threshold may be a value set such that the coupling efficiency between the transmitting coil 301 and the receiving coil 322 is equal to or greater than a specified value (eg, 0.5) in a specified alignment state. Since the transmitting coil 301 and the receiving coil 322 have substantially the same size, when the transmitting coil 301 and the receiving coil 322 are accurately aligned and arranged, power is reduced with high power transmission efficiency. Can be delivered. For example, when the center of the transmitting coil 301 and the receiving coil 322 in a three-dimensional space are spaced apart in the z-axis direction, the two-dimensional position of the transmitting coil 301 on the x-axis and y-axis When the two-dimensional positions on the x-axis and y-axis of the receiving coil 322 are substantially the same, power can be delivered with high power transmission efficiency. As the difference between the centers of both coils increases, the power transmission efficiency can decrease rapidly. Accordingly, charging is possible only when the electronic device 150 is accurately disposed in correspondence with the position of the transmission coil 301, thereby reducing the degree of freedom in the arrangement of the electronic device 150.

Increasing the size of the transmission coil 301 may be considered in order to improve the degree of freedom of arrangement. However, the electronic device 150 may include metallic materials (eg, aluminum) 323 and 324 at both ends according to implementation. In this case, the magnetic field generated from the transmission coil 301 may be excited by the

metal materials

323 and 324, which may cause unnecessary induced current formation in the

metal materials

323 and 324 and thus generate heat.

4A is a plan view illustrating a transmission coil and a ferrite according to various embodiments. 4B is a side view illustrating a transmission coil and a ferrite according to various embodiments.

4A and 4B, a wireless power transmission apparatus 100 according to various embodiments includes a first ferrite 401, a first transmission coil 402, a second transmission coil 403, or a second transmission coil. It may include at least one of the ferrites 410. According to various embodiments, the first ferrite 401 may have a sheet shape. The first transmission coil 402 may be positioned on the first ferrite 401. The first transmission coil 402 may have a spiral shape, but the shape is not limited. A second transmission coil 403 may be positioned on the first transmission coil 402. The second transmission coil 403 may have a spiral shape, but the shape is not limited. 4A and 4B, the outer diameter of the first transmission coil 402 may be larger than the outer diameter of the second transmission coil 403. The inner diameter of the first transmission coil 402 may be larger than the inner diameter of the second transmission coil 403. In various embodiments, the first transmission coil 402 and the second transmission coil 403 may have an inner diameter of the same length, which will be described with reference to FIG. 4C. The thick line in FIG. 4A is only used to easily distinguish the inner and outer boundaries of the first transmission coil 402 and the second transmission coil 403, and it means that the width of the coil is different in the corresponding part. I don't.

According to various embodiments, the second ferrite 410 may be positioned inside the first transmission coil 402 and inside the second transmission coil 403. The height of the second ferrite 410 may be greater than the sum of the height of the first transmission coil 402 and the height of the second transmission coil 403. However, the height of the second ferrite 410 may be equal to or smaller than the sum of the height of the first transmission coil 402 and the height of the second transmission coil 403 depending on implementation. As the height of the second ferrite 410 is relatively high, when the electronic device 150 is disposed in the wireless power transmission device 100, the receiving coil and the second ferrite 410 of the electronic device 150 The distance between them can be relatively short. For example, the height of the second ferrite 410 may be determined so that the distance between the receiving coil and the second ferrite 410 is within 0.3 mm to 30 mm. The difference between the outer diameter of the second ferrite 410 and the inner diameter of the second transmission coil 403 may be determined within a range of, for example, 0 to 10 mm.

According to the structure including the first transmission coil 402, the second transmission coil 403, and the second ferrite 410, the first transmission coil 402 and the second transmission coil 403 The magnetic field formed by this may be concentrated to the centers of the first transmission coil 402 and the second transmission coil 403. The sizes (eg, outer diameters) of the first transmission coil 402 and the second transmission coil 403 may be larger than the transmission coil 301 according to the comparative example. That is, the size (eg, outer diameter) of the first transmission coil 402 and the second transmission coil 403 is an electronic device (eg, a smart phone, a tablet PC, or a smart watch) for general power reception. It may be larger than the size of the receiving coil 322 included in. Accordingly, even if the distance in two dimensions between the center of the first transmission coil 402 and the second transmission coil 403 and the center of the reception coil 322 is somewhat lower, relatively good power transmission Efficiency can be guaranteed. That is, the degree of freedom of arrangement of the electronic device 150 during wireless power transmission/reception may increase. In addition, as described above, the magnetic field formed by the first transmission coil 402 and the second transmission coil 403 is the center of the first transmission coil 402 and the second transmission coil 403 As the concentration is concentrated, magnetic field excitation to the

metal materials

323 and 324 positioned at both ends of the electronic device 150 may also be reduced.

In addition, the magnetic fields induced by the first transmission coil 402 and the second transmission coil 403 by the second ferrite 410 may be further strengthened. As described above, according to various embodiments, the height of the second ferrite 410 may be greater than the sum of the height of the first transmission coil 402 and the height of the second transmission coil 403, and accordingly The ferrite 410 may be close to the receiving coil 322 of the electronic device 150 for wireless power reception, and accordingly, power transmission efficiency may be increased. The permeability of the second ferrite 410 may be higher than that of the first ferrite 401, but there is no limitation. For example, the permeability of the second ferrite 410 may be equal to or lower than the permeability of the first ferrite 401.

Referring to FIG. 4C, a wireless power transmission apparatus 100 according to various embodiments includes a first ferrite 431, a first transmission coil 432, a second transmission coil 433, or a second ferrite ( 430) may be included. According to various embodiments, the first ferrite 431 may have a sheet shape. The first transmission coil 432 may be positioned on the first ferrite 431. The second transmission coil 433 may be positioned on the first transmission coil 432. A second ferrite 430 may be positioned inside the first transmission coil 432 and the second transmission coil 433. In the embodiment of FIG. 4C, the outer diameter of the first transmission coil 432 may be larger than the outer diameter of the second transmission coil 433. The inner diameter of the first transmission coil 432 and the inner diameter of the second transmission coil 433 may be substantially the same.

Referring to FIG. 5A, an apparatus 100 for transmitting wireless power according to various embodiments may include a first ferrite 511 and a second ferrite 521. The first ferrite 511 and the second ferrite 521 are illustrated as being spaced apart from each other, but may be implemented as a single sheet-type ferrite depending on implementation. A first transmission coil 511 may be located on the first ferrite 511, and a second transmission coil 512 may be located on the first transmission coil 211. The outer diameter of the first transmission coil 511 may be larger than the outer diameter of the second transmission coil 512. A third ferrite 514 may be positioned inside the first transmission coil 511 and the second transmission coil 512. The height of the third ferrite 512 may be greater than the sum of the height of the first transmission coil 511 and the height of the second transmission coil 512. A third transmission coil 521 may be located on the second ferrite 521, and a fourth transmission coil 522 may be located on the third transmission coil 521. The outer diameter of the third transmission coil 521 may be larger than the outer diameter of the fourth transmission coil 522. A fourth ferrite 514 may be positioned inside the third transmission coil 521 and the fourth transmission coil 522. The height of the fourth ferrite 514 may be greater than the sum of the height of the third transmission coil 521 and the height of the fourth transmission coil 522.

The apparatus for transmitting power wirelessly according to the embodiment of FIG. 5B may further include a fifth transmission coil 530 compared to FIG. 5A. The fifth transmission coil 530 may be positioned on, for example, the second transmission coil 513 and the fourth transmission coil 523. The two-dimensional position of the center of the fifth transmission coil 530 is between the two-dimensional position of the center of the second transmission coil 513 and the two-dimensional position of the center of the fourth transmission coil 523 I can. The magnetic field from the first transmission coil 512 and the second transmission coil 513 may be concentrated at the center of the first transmission coil 512 and the second transmission coil 513, and may be used for the third transmission. The magnetic field from the coil 522 and the fourth transmission coil 523 may be concentrated at the centers of the third transmission coil 522 and the fourth transmission coil 523. The fifth transmission coil 530 is a shaded area by the first transmission coil 512, the second transmission coil 513, the third transmission coil 522 and the fourth transmission coil 523 ( Example: It is possible to transmit power with a relatively high power transmission efficiency to the electronic device 150 disposed in the area between the center of the first transmission coil 512 and the center of the third transmission coil 522). .

6A is a diagram illustrating a coil connection relationship in a wireless power transmission apparatus according to various embodiments. 6B is a diagram illustrating a coil connection relationship in a wireless power transmission apparatus according to various embodiments.

As shown in FIG. 6A, a first transmission coil 602 and a second transmission coil 603 may be connected to an inverter 601 included in the wireless power transmission apparatus 100. The first transmission coil 602 and the second transmission coil 603 may be connected in series. The inverter 601 may invert the input power into AC power and transmit it to the first transmission coil 602 and the second transmission coil 603. According to various embodiments, at least one element (eg, a capacitor) or circuit (eg, an amplifying circuit) intervenes between the inverter 602 and the first transmission coil 602 and the second transmission coil 603 Can be connected. Meanwhile, in FIG. 6A, the inverter 601 is shown to be connected to the first transmission coil 602 and the second transmission coil 603, but any of the wireless power transmission apparatus 100 according to various embodiments The first transmission coil 602 and the second transmission coil 603 may be connected to the device. The inverter 601 may be included in the power transmission circuit 109, for example, but its name may be referred to as a DC-AC conversion circuit, a converter, or the like according to implementation. Alternatively, depending on the implementation, the wireless power transmission apparatus 100 may not include an inverter 601, in this case, the first transmission coil 602 and the second transmission coil 603 are directly or It may be connected through other circuits (or other devices).

As shown in FIG. 6B, the first transmission coil 613 may be wound in a spiral shape in the first layer. The second transmission coil 612 may be wound in a spiral shape in the second layer. One end of the first transmission coil 613 may be connected directly to the inverter 601 or through another element (or another circuit). The other end of the first transmission coil 613 may be connected to one end of the second transmission coil 612 of the second layer. The other end of the second transmission coil 612 may be connected directly to the inverter 601 or through another element (or other circuit).

7A is a diagram illustrating a coil connection relationship in a wireless power transmission apparatus according to various embodiments. 7B is a diagram illustrating a coil connection relationship in a wireless power transmission apparatus according to various embodiments.

As shown in FIG. 7A, a first transmission coil 702 and a second transmission coil 703 may be connected to an inverter 701 included in the wireless power transmission apparatus 100. The first transmission coil 702 and the second transmission coil 703 may be connected in parallel. The inverter 701 may invert the input power into AC power and transmit it to the first transmission coil 702 and the second transmission coil 703. According to various embodiments, at least one element (eg, capacitor) or circuit (eg, an amplifying circuit) intervenes between the inverter 702 and the first transmission coil 702 and the second transmission coil 703 Can be connected.

As shown in FIG. 7B, the first transmission coil 712 may be wound in a spiral shape in the first layer. The second transmission coil 713 may be wound in a spiral shape in the second layer. Both ends of the first transmission coil 712 may be connected directly to the inverter 601 or through other elements (or other circuits). Both ends of the first transmission coil 712 may be connected to both ends of the second transmission coil 713 of the second layer. Both ends of the second transmission coil 713 may be connected directly to the inverter 601 or through other elements (or other circuits).

Referring to FIG. 8, a wireless power transmission apparatus 100 according to various embodiments includes a first ferrite 800, a first transmission coil 811, a second transmission coil 812, or a second ferrite ( 810). According to various embodiments, the first ferrite 800 may have a sheet shape. The first transmission coil 811 may be positioned on the first ferrite 800. The first transmission coil 801 may have a spiral shape, but the shape is not limited. A second transmission coil 802 may be positioned on the first transmission coil 801. The second transmission coil 802 may have a spiral shape, but the shape is not limited.

In the embodiment of Figs. 4A and 4B, in contrast to the arrangement in which the center of the first transmission coil 402 and the center of the second transmission coil 403 substantially coincide on a two-dimensional coordinate, in the embodiment of Fig. 8 The center of the first transmission coil 811 and the center of the second transmission coil 812 may be arranged so that they do not coincide on the two-dimensional coordinates. That is, the position on the 2D coordinate of the center of the first transmission coil 811 may be spaced apart from the position on the 2D coordinate of the center of the second transmission coil 812. The first transmission coil 811 and the second transmission coil 812 may be spaced apart on two-dimensional coordinates in order to secure a wider charging area. The distance between the centers of the

coils

811 and 812 may be determined to cover a charging area required to be secured. The second ferrite 810 may be positioned inside the first transmission coil 811 and inside the second transmission coil 812. The height of the second ferrite 810 may be greater than the sum of the height of the first transmission coil 811 and the height of the second transmission coil 812.

9 illustrates a transmitting coil according to various embodiments.

As shown in FIG. 9, the transmission coil 910 according to various embodiments may be wound in a spiral shape. The width w1 of the first portion 911 of the transmission coil 910 according to various embodiments may be different from the width w2 of the second portion 912. For example, the width w1 of the first part 911 may be smaller than the width w2 of the second part 912, and the gap between wires located in the first part 911 is limited. It may be smaller than the spacing between the wires located in the 2 part 912. At least some of the coils of various embodiments of the present disclosure may have a winding structure of the transmission coil of FIG. 9.

10A illustrates a transmission coil according to a comparative example for comparison with various embodiments. The transmission coil 1001 according to the comparative example may have an area of 40.5 X 47.5 mm2. 10B is a diagram illustrating a transmission coil and a ferrite according to various embodiments. As shown in FIG. 10B, the transmission coil 1011 according to various embodiments may have an area of 60 X 47.5 40.5 X 47.5 mm2. The transmission coil 1011 according to various embodiments may have a larger area than the transmission coil 1011 according to the comparative example. A ferrite 1012 may be located inside the transmitting coil 1011. The ferrite 1012 may compensate for a reduction in coupling coefficient and may strengthen a magnetic field. 10C shows an experimental environment for testing a coupling coefficient according to a degree of misalignment. Referring to FIG. 10C, a transmitting coil 1011 and a receiving coil 1020 according to a comparative example may be displayed by being superimposed on a 2D coordinate. In FIG. 10C, the position of the center of the transmitting coil 1011 on the two-dimensional coordinates and the position of the center of the receiving coil 1020 on the two-dimensional coordinates may be separated by 20 mm, and x-axis misalignment. It can be expressed as a degree of 20mm. The coupling coefficient measurement experiment may be performed, for example, while adjusting the degree of x-axis misalignment. The experiment may be performed while moving the receiving coil 1020 in an environment in which the transmitting coil 1011 and the ferrite 1012 according to various embodiments are located.

A first graph 1031 shows coupling coefficients measured according to various x-axis misalignment degrees for the transmission coil 1001 according to the comparative example of FIG. 10A. The second graph 1032 shows coupling coefficients measured according to various degrees of x-axis misalignment with respect to the transmission coil 1011 in which the ferrite 1012 is located, as in the various embodiments of FIG. 10B. The third graph 1033 is the coupling coefficients measured according to various degrees of x-axis misalignment of the transmitting coil 1011 when the ferrite 1012 is not located inside in various embodiments of FIG. 10B. .

As shown in FIG. 10D, the degree of misalignment of the expected charging area may be about 13 mm. It can be seen that the coupling coefficient indicated by the first graph 1031 at the boundary of the expected charging region is about 0.3, and the coupling coefficient indicated by the second graph 1032 is about 0.4. That is, according to the structure of the transmission coil 1011 and the ferrite 1012 according to various embodiments, a higher coupling coefficient may be secured at the boundary of the expected charging area. Accordingly, the degree of freedom of the charging position may be increased by the structure according to various embodiments. In addition, it can be seen that the coupling coefficient of the second graph 1032 is higher than that of the third graph 1033 at the same degree of x-axis misalignment, and accordingly, the coupling coefficient is increased by the ferrite 1012 disposed inside. It can be confirmed that.

As shown in FIG. 11A, the center of the coil 1101 included in the first type of electronic device 1100 may be located at a point of 81.25 mm with respect to the support surface of the wireless power transmission device 1150. The center of the coil 1101 included in the first type of electronic device 1100 is a support surface of the wireless power transmission device 1150 when the first type of electronic device 1100 is inserted into the case 1102 It can be located at a point of 83.2mm. The center of the coil 1111 included in the second type of electronic device 1110 may be located at a point of 71.2 mm with respect to the support surface of the wireless power transmission device 1150. The first type of electronic device 1100 may be a large sized smart phone on the market, and the second type of electronic device 1110 may be a small sized smart phone on the market. Depending on the size of commercially available smart phones, there may be a difference in the center position of about 12mm (ie, about -6mm to +6mm). This can be referred to as the y-axis center error.

Referring to FIG. 11B, the first structure 1120 may include a first transmission coil 1121 and a ferrite 1122 positioned inside the second transmission coil 1121. The first transmission coil 1121 may have an area of 60 X 47.5 mm2. When the center error of the y-axis is considered, an effective charging area of 18 mm in the y-axis direction may be secured in the first structure 1120. The second structure 1120 is a ferrite positioned inside the first transmission coil 1131, the second transmission coil 1132, and the first transmission coil 1131 and the second transmission coil 1132 ( 1133) may be included. Each of the first transmission coil 1131 and the second transmission coil 1132 may have an area of 70 X 50.5 mm2. Considering the center error of the y-axis, in the second structure 1130, an effective charging area of 22 mm may be secured in the y-axis direction.

A first graph 1141 shows coupling coefficients measured according to various x-axis misalignment degrees for the transmission coil 1001 according to the comparative example of FIG. 10A. The second graph 1142 shows coupling coefficients measured according to various degrees of x-axis misalignment for the first structure 1120 in FIG. 11B. A third graph 1143 shows coupling coefficients measured according to various degrees of x-axis misalignment for the second structure 1130 in FIG. 11B. It can be seen that the coupling coefficient by the second structure 1130 at the same x-axis misalignment degree is higher than the coupling coefficient by the first structure 1120.

A first graph 1151 shows coupling coefficients measured according to various x-axis misalignment degrees for the transmitting coil 1001 according to the comparative example of FIG. 10A. The second graph 1152 shows coupling coefficients measured according to various degrees of x-axis misalignment with respect to the first structure 1120 in FIG. 11B. A third graph 1153 shows coupling coefficients measured according to various degrees of x-axis misalignment for the second structure 1130 in FIG. 11B. It can be seen that the coupling coefficient by the second structure 1130 at the same x-axis misalignment degree is higher than the coupling coefficient by the first structure 1120.

As shown in FIGS. 11C and 11D, it can be seen that the degree of freedom of the charging position in the x-axis direction is expanded by the first structure 1120 and the second structure 1130 at various degrees of y-axis misalignment.

Various embodiments of the present document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutes of the corresponding embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or a plurality of the items unless clearly indicated otherwise in a related context. In this document, “A or B”, “at least one of A and B”, “at least one of A or B,” “A, B or C,” “at least one of A, B and C,” and “A Each of phrases such as "at least one of, B, or C" may include any one of the items listed together in the corresponding one of the phrases, or all possible combinations thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish the component from other corresponding components, and the components may be referred to in other aspects (eg, importance or Order) is not limited. Some (eg, first) component is referred to as “coupled” or “connected” to another (eg, second) component, with or without the terms “functionally” or “communicatively”. When mentioned, it means that any of the above components can be connected to the other components directly (eg by wire), wirelessly, or via a third component.

Each of the aforementioned components of the wireless power transmitter or electronic device may be composed of one or more components, and the name of the corresponding component may vary according to the type of the electronic device. In various embodiments, the electronic device may include at least one of the above-described components, and some components may be omitted or additional other components may be further included. In addition, some of the constituent elements of the electronic device according to various embodiments of the present disclosure are combined to form a single entity, so that functions of the corresponding constituent elements before the combination may be performed in the same manner.

The term "module" used in this document may mean, for example, a unit including one or a combination of two or more of hardware, software, or firmware. "Module" may be used interchangeably with terms such as unit, logic, logical block, component, or circuit, for example. The "module" may be the smallest unit of integrally configured parts or a part thereof. The "module" may be a minimum unit or a part of one or more functions. The "module" can be implemented mechanically or electronically. For example, a "module" is one of known or future developed application-specific integrated circuit (ASIC) chips, field-programmable gate arrays (FPGAs), or programmable-logic devices that perform certain operations. It may include at least one.

In addition, the embodiments disclosed in this document are presented for description and understanding of the disclosed and technical content, and do not limit the scope of the present disclosure. Therefore, the scope of the present disclosure should be construed as including all changes or various other embodiments based on the technical idea of the present disclosure.

Claims

In the wireless power transmission device,

Power source;

A first ferrite having a sheet form;

A first transmission coil positioned on the first ferrite and forming a magnetic field using power provided from the power source;

A second transmitting coil positioned on the first transmitting coil and forming a magnetic field using the power provided from the power source; And

And a second ferrite positioned inside the first transmission coil and inside the second transmission coil, and having a height greater than the sum of the heights of the first transmission coil and the second transmission coil Wireless power transmission device.
The method of claim 1,

The wireless power transmission device, wherein an outer diameter of the first transmission coil is larger than an outer diameter of the second transmission coil.
The method of claim 1,

The wireless power transmission device, wherein a position of the center of the first transmission coil in two dimensions is substantially the same as a position of the center of the second transmission coil in two dimensions.
The method of claim 1,

The wireless power transmission device, wherein the inner diameter of the first transmission coil is substantially the same as the inner diameter of the second transmission coil.
The method of claim 1,

The wireless power transmission device, wherein an inner diameter of the first transmission coil is larger than an inner diameter of the second transmission coil.
The method of claim 1,

The first transmission coil and the second transmission coil have substantially the same shape and substantially the same size,

A wireless power transmission apparatus, wherein a position of the center of the first transmission coil in two dimensions is separated from a position of the center of the second transmission coil in two dimensions.
The method of claim 1,

When an electronic device for wirelessly receiving power is located on the wireless power transmission device, the height of the second ferrite is set so that the distance between the second ferrite and the receiving coil in the electronic device is within a specified length. Wireless power transmission device.
The method of claim 1,

The wireless power transmission device, characterized in that the first transmission coil and the second transmission coil have a spiral shape.
The method of claim 8,

The width of the portion extending in the first direction of the first transmission coil and the second transmission coil is larger than the width of the portion extending in the second direction of the first transmission coil and the second transmission coil. Wireless power transmission device, characterized in that.
The method of claim 1,

The wireless power transmission apparatus, characterized in that the difference between the inner diameter of the first transmission coil and the outer diameter of the second ferrite is set to be within a specified range.
The method of claim 1,

The first transmission coil is a wireless power transmission device, characterized in that connected in series or parallel to the second transmission coil.
In the wireless power transmission device,

Power source;

A first ferrite having a sheet form;

A first transmission coil positioned on the first ferrite and forming a magnetic field using power provided from the power source;

A second transmitting coil positioned on the first transmitting coil and forming a magnetic field using the power provided from the power source; And

And a second ferrite positioned inside the first transmission coil and inside the second transmission coil,

The wireless power transmission device, wherein an outer diameter of the first transmission coil is larger than an outer diameter of the second transmission coil.
In the structure for generating a magnetic field,

A first ferrite having a sheet form;

A first transmission coil positioned on the first ferrite and forming a magnetic field using power provided from the outside;

A second transmission coil positioned on the first transmission coil and forming a magnetic field using the power provided from the outside; And

And a second ferrite positioned inside the first transmission coil and inside the second transmission coil, and having a height greater than the sum of the height of the first transmission coil and the height of the second transmission coil Structure.
The method of claim 13,

The structure, characterized in that the outer diameter of the first transmission coil is larger than the outer diameter of the second transmission coil.
The method of claim 13,

A structure, wherein a position of the center of the first transmission coil in two dimensions is substantially the same as a position of the center of the second transmission coil in two dimensions.