KR102407897B1 - Wireless power transmitting device and electronic device for wirelessly receiving power - Google Patents

Abstract

Disclosed is a wireless power transmission device that wirelessly transmits power to an electronic device. A wireless power transmission apparatus according to various embodiments of the present invention, a first coil having a first number of windings and a second winding different from the first number of windings, generating a magnetic field by receiving power for transmission to the electronic device It includes a second coil having a bow, and an induced electromotive force generated in the second coil based on the magnetic field may be used for operation of at least one hardware of the wireless power transmitter.

Description

A wireless power transmitting device and an electronic device receiving power wirelessly

Various embodiments of the present disclosure relate to a wireless power transmission device for wirelessly transmitting power and an electronic device for wirelessly receiving 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 that 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 being networked into one. In order to smoothly operate these various sensors, a wireless power transmission system is required.

Wireless power transmission includes magnetic induction, magnetic resonance, and electromagnetic wave methods. The magnetic induction or magnetic resonance method is advantageous for charging an electronic device located relatively close to the wireless power transmitter. The electromagnetic wave method is more advantageous for long-distance power transmission up to several meters in a magnetic induction or magnetic resonance method. The electromagnetic wave method is mainly used for long-distance power transmission, and it can transmit power most efficiently by identifying the exact location of a power receiver at a long distance.

A wireless power transmitter may be generally connected to a wall power source by wire, process power input from the wall power source, and transmit it to various electronic devices. The voltage of the power provided from the wall power source may be set according to a national standard, and may have a voltage of 110V or 220V, for example. The wireless power transmission device may process power provided from the wall power source and provide it to a power transmission coil (eg, a primary-side coil). In addition, the wireless power transmitter may operate various hardware (eg, a communication circuit, a control circuit, an inverter, etc.) included in the wireless power transmitter using power provided from a wall power supply. Various hardware included in the wireless power transmitter generally have an operating voltage lower than the voltage of the wall power supply. Accordingly, the wireless power transmitter must include an adapter that performs an operation such as down-converting the voltage from the wall power source, and can process power from the wall power source using the adapter and provide it to each hardware. . However, there is a problem in that the volume and weight of the wireless power transmitter increase as well as the production cost increases due to the acceptance of the adapter. In addition, the electronic device that wirelessly receives power must include an adapter for providing various hardware with wirelessly received power.

Various embodiments of the present disclosure may provide a wireless power transmission device including a plurality of coils and capable of providing hardware with an induced electromotive force induced in another coil by a magnetic field generated from the power transmission coil. Various embodiments of the present disclosure may provide an electronic device capable of providing, to each of a plurality of hardware, an induced electromotive force generated in each of a plurality of coils by a magnetic field generated from a coil for power transmission.

A wireless power transmission apparatus for wirelessly transmitting power to an electronic device according to various embodiments of the present disclosure includes a first coil having a first number of windings, the first coil generating a magnetic field by receiving power to be transmitted to the electronic device, and the It includes a second coil having a second number of turns different from the first number of turns, and the induced electromotive force generated in the second coil based on the magnetic field generated from the first coil is at least one of the wireless power transmitter. Used for the operation of hardware, the ratio of the voltage applied to the first coil and the voltage applied to the second coil may be determined according to the ratio of the number of the first windings to the number of the second windings.

According to various embodiments of the present disclosure, an electronic device wirelessly receiving power from a wireless power transmitting device includes: first hardware having a first operating voltage; second hardware having a second operating voltage different from the first operating voltage; a first coil for generating a first induced electromotive force using a magnetic field generated from the wireless power transmitter; and a second coil generating a second induced electromotive force using the magnetic field generated from the wireless power transmitter, wherein the first induced electromotive force is used for operation of the first hardware, and the second induced electromotive force is It may be used for the operation of the second hardware.

According to various embodiments of the present invention, a wireless power transmission apparatus including a plurality of coils and capable of providing hardware with an induced electromotive force induced in another coil by a magnetic field generated from the power transmission coil may be provided. According to various embodiments of the present disclosure, an electronic device capable of providing, to each of a plurality of hardware, an induced electromotive force generated in each of a plurality of coils by a magnetic field generated from a coil for power transmission may be provided. Accordingly, the wireless power transmission device and the electronic device may not include hardware such as an adapter, and thus the volume, weight, or production cost may be reduced.

1 is a block diagram of a wireless power transmission apparatus and an electronic device according to various embodiments of the present disclosure.
2 is a conceptual diagram illustrating a media device and a TV according to various embodiments of the present disclosure.
3A is a block diagram of a wireless power transmitter and an electronic device according to various embodiments of the present disclosure;
3B is a block diagram of a power transmitting circuit and a power receiving circuit according to an inductive or resonant method according to various embodiments of the present disclosure.
3C is a block diagram of a power transmitting circuit and a power receiving circuit according to an electromagnetic wave method according to various embodiments of the present disclosure.
4 is a block diagram of an apparatus for transmitting power wirelessly according to various embodiments of the present invention.
5A-5C illustrate a coil in accordance with various embodiments of the present invention.
6A-6D illustrate a plurality of coil arrangements in accordance with various embodiments of the present invention.
7 is a block diagram illustrating coils according to various embodiments of the present invention.
8A and 8B are block diagrams of an apparatus for transmitting power wirelessly according to various embodiments of the present disclosure.
9 shows a detailed circuit diagram of a startup circuit according to various embodiments of the present invention.
10 illustrates a coil of an electronic device that wirelessly receives power according to various embodiments of the present disclosure.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. The examples and terms used therein are not intended to limit the technology described in this document to a specific embodiment, but should be understood to include various modifications, equivalents, and/or substitutions of the embodiments. In connection with the description of the drawings, like reference numerals may be used for like components. The singular expression may include the plural expression unless the context clearly dictates otherwise. In this document, expressions such as “A or B” or “at least one of A and/or B” may include all possible combinations of items listed together. Expressions such as "first," "second," "first," or "second," can modify the corresponding elements, regardless of order or importance, and to distinguish one element from another element. It is used only and does not limit the corresponding components. When an (eg, first) component is referred to as being “(functionally or communicatively) connected” or “connected” to another (eg, second) component, that component is It may be directly connected to the component or may be connected through another component (eg, a third component).

In this document, "configured (or configured to)" means "suitable for," "having the ability to," "modified to," depending on the context, for example, hardware or software. ," "made to," "capable of," or "designed to" may be used interchangeably. In some circumstances, the expression “a device configured to” may mean that the device is “capable of” with other devices or parts. For example, the phrase "a processor configured (or configured to perform) A, B, and C" refers to a dedicated processor (eg, an embedded processor) for performing the corresponding operations, or by executing one or more software programs stored in a memory device. , may refer to a general-purpose processor (eg, a CPU or an application processor) capable of performing corresponding operations.

The wireless power transmission device or electronic device according to various embodiments of the present document may include, for example, a smartphone, a tablet PC, a mobile phone, a video phone, an e-book reader, a desktop PC, a laptop PC, a netbook computer, a workstation, It may include at least one of a server, a PDA, a portable multimedia player (PMP), an MP3 player, a medical device, a camera, and a wearable device. A wearable device may be an accessory (e.g., watch, ring, bracelet, anklet, necklace, eyewear, contact lens, or head-mounted-device (HMD)), a textile or clothing integral (e.g. electronic garment); It may include at least one of a body-worn (eg, skin pad or tattoo) or bioimplantable circuit In some embodiments, the wireless power transmission device or electronic device is, for example, a television, a television and a wired Or wirelessly linked set-top box, DVD (digital video disk) player, audio, refrigerator, air conditioner, vacuum cleaner, oven, microwave oven, washing machine, air purifier, set-top box, home automation control panel, security control panel, media box , may include at least one of a game console, an electronic dictionary, an electronic key, a camcorder, an electric vehicle, or an electronic picture frame.

In another embodiment, the wireless power transmission device or the electronic device may include various medical devices (eg, various portable medical measuring devices (eg, a blood glucose meter, a heart rate monitor, a blood pressure monitor, or a body temperature monitor), magnetic resonance angiography (MRA), MRI (magnetic resonance angiography), magnetic resonance imaging), computed tomography (CT), imagers, or ultrasound machines, etc.), navigation devices, global navigation satellite system (GNSS), event data recorder (EDR), flight data recorder (FDR), automotive infotainment devices, marine electronic equipment (e.g. marine navigation systems, gyro compasses, etc.), avionics, security devices, vehicle head units, industrial or domestic robots, drones, ATMs in financial institutions; Includes at least one of a store's point of sales (POS) or Internet of Things (IoT) devices (e.g., light bulbs, sensors, sprinkler devices, fire alarms, thermostats, street lights, toasters, exercise equipment, hot water tanks, heaters, boilers, etc.) can do. According to some embodiments, the wireless power transmitting device or electronic device is a piece of furniture, building/structure or automobile, an electronic board, an electronic signature receiving device, a projector, or various measuring devices (eg : water, electricity, gas, or radio wave measuring device). In various embodiments, the wireless power transmission device or electronic device may be flexible, or a combination of two or more of the various devices described above. The wireless power transmitter or electronic device according to the embodiment of the present document is not limited to the above-described devices. In this document, the term user may refer to a person using an electronic device or a wireless power transmission device or a device using the electronic device (eg, an artificial intelligence electronic device).

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

Referring to FIG. 1 , an apparatus 100 for transmitting power wirelessly according to various embodiments of the present disclosure may wirelessly transmit power 161 to an electronic device 150 . The wireless power transmitter 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 power 161 according to an induction method. When the wireless power transmitter 100 is inductive, the wireless power transmitter 100 includes, for example, a power source, a DC-AC conversion circuit, an amplifier circuit, an impedance matching circuit, at least one capacitor, and at least one of a coil, a communication modulation/demodulation circuit, and the like. The at least one capacitor may constitute a resonance circuit together with the 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 apparatus 100 for transmitting power wirelessly may transmit power 161 according to a resonance method. In the case of the resonance method, the wireless power transmission device 100 includes, for example, a power source, a DC-AC conversion circuit, an amplifier circuit, an impedance matching circuit, at least one capacitor, at least one coil, an out-band communication circuit ( For example: BLE (bluetooth low energy) communication circuit) and the like. At least one capacitor and at least one coil may constitute a resonance circuit. The wireless power transmitter 100 may be implemented in a manner defined in an Alliance for Wireless Power (A4WP) standard (or an air fuel alliance (AFA) standard). The wireless power transmitter 100 may include a coil capable of generating an induced magnetic field when current flows according to a resonance method or an induction method. A process in which the wireless power transmitter 100 generates an induced magnetic field may be expressed as that the wireless power transmitter 100 wirelessly transmits power 161 . In addition, the electronic device 150 may include a coil in which an induced electromotive force is generated by a magnetic field whose size changes according to time formed around it. A process in which the electronic device 150 generates an induced electromotive force through a coil may be expressed as that the electronic device 150 receives the power 161 wirelessly. For example, the apparatus 100 for transmitting power wirelessly may transmit power 161 according to an electromagnetic wave method. When the wireless power transmission device 100 is by the electromagnetic wave method, the wireless power transmission device 100, for example, a power source, a DC-AC conversion circuit, an amplifier circuit, a distribution circuit, a phase shifter, a plurality of patch antennas It may include an antenna array for power transmission that includes, an out-band communication circuit (eg, a BLE communication module), and the like. Each of the plurality of patch antennas may form a radio frequency (RF) wave (eg, electromagnetic wave). The electronic device 150 may include a patch antenna capable of outputting a current using an RF wave formed around it. A process in which the wireless power transmitter 100 forms an RF wave may be expressed as that the wireless power transmitter 100 wirelessly transmits power 161 . A process in which the electronic device 150 outputs a current from the patch antenna using an RF wave may be expressed as that the electronic device 150 wirelessly receives the power 161 .

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

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

2 is a conceptual diagram illustrating a media device and a TV according to various embodiments of the present disclosure.

The media device 101 according to various embodiments of the present disclosure may wirelessly transmit power 161 to the TV 151 . The media device 101 may be an example of the device 100 for transmitting power wirelessly, and the TV 151 may be an example of the electronic device 150 receiving power wirelessly. The media device 101 may include a power transmission circuit using at least one of the various wireless charging methods described above. The media device 101 may transmit a communication signal 162 to the TV 151 . For example, the communication signal 162 may include at least one of media data displayed on the TV 151 , data for controlling wireless charging, or TV control data for controlling the operation of the TV 151 . Media data, data for controlling wireless charging, or TV control data may be transmitted/received by the same communication method, or may be transmitted/received by different communication methods. For example, the media device 101 may transmit media data to the TV 151 according to a communication method defined in a wireless gigabit alliance (Wi-gig), and may transmit media data to the TV 151 according to the BLE communication method for wireless charging control. Data may be transmitted/received, and TV control data may be transmitted to the TV 151 using an IR module, and there is no limitation on the communication method. For example, the TV 151 may include an IR module for receiving a control signal according to an IR communication method from a control device (not shown) such as a remote control, and receives TV control data from the media device 101 . It is possible to receive a communication signal 162 including. The control signal may be a signal including an operation execution command, and is called a control signal to indicate that it is a signal transmitted from a control device (not shown), and may also be called an operation execution command. There is no limitation on the communication method in which the control device (not shown) transmits the control signal. In various embodiments of the present disclosure, at least two data among media data, data for controlling wireless charging, and TV control data may be transmitted/received by one communication module. For example, the media device 101 may transmit media data to the TV 151 through a Wi-gig communication method, and may transmit data for controlling wireless charging and TV control data through a BLE module. . The media device 101 may perform wired or wireless communication with other peripheral devices 131 , 132 , and 133 . For example, the media device 101 may communicate with the first peripheral device 131 according to a cable according to the HDMI standard, and communicate with the second peripheral device 132 according to a cable according to the USB standard. may be performed, and may communicate with the third peripheral device 133 wirelessly according to the BLE communication method. The other peripheral devices 131 , 132 , and 133 may be, for example, electronic devices capable of transmitting media data by wire or wirelessly, such as a game machine, a set-top box, and a DVD player. The media device 101 may include at least one of the media data received from the other peripheral devices 131 , 132 , and 133 in the communication signal 162 and transmit it to the TV 151 . The media device 101 may transmit the received media data to the TV 151 as it is, or may transcode the received media data and transmit it to the TV 151 . The media device 101 may transmit the received media data to the TV 151 by performing processing such as decoding or image correction. Alternatively, the media device 101 may transmit directly generated media data to the TV 151 without receiving media data from other peripheral devices 131 , 132 , and 133 . In this case, the media device 101 may be implemented as an electronic device capable of generating media data, such as a game machine, a set-top box, and a DVD player. The media device 101 wirelessly transmits power and transmits media data is merely exemplary, and in various embodiments of the present invention, the wireless power transmitting device and the electronic device transmitting media data may be implemented as different entities. may be The media device 101 is merely exemplary and a device such as a sound bar may wirelessly transmit power to the TV.

3A is a block diagram of a wireless power transmitter and an electronic device according to various embodiments of the present disclosure;

The wireless power transmission apparatus 100 according to various embodiments of the present disclosure includes a power transmission circuit 109 , a control circuit 102 , a communication circuit 103 , a memory 105 , a power source 106 , and a media data interface. (108). The electronic device 150 according to various embodiments of the present disclosure includes a power receiving circuit 159 , a control circuit 152 , a communication circuit 153 , a display 154 , a memory 156 , and a media data interface 160 . may include.

The power transmission circuit 109 according to various embodiments of the present disclosure is the power reception circuit 159 and may wirelessly transmit power according to at least one of an induction method, a resonance method, and an electromagnetic wave method. The detailed configuration of the power transmission circuit 109 and the power reception circuit 159 will be described in more detail with reference to FIGS. 3B and 3C . The control circuit 102 may control the amount of power transmitted by the power transmission circuit 109 . For example, as the control circuit 102 controls the amount of power output from the power source 106 or controls an amplification gain of a power amplifier included in the power transmission circuit 109 , the power The amount of power transmitted by the transmission circuit 109 may be controlled. The control circuit 102 may adjust the amount of power output from the power source 106 by controlling a duty cycle or frequency of the power output from the power source 106 . The power source 106 may include, for example, a power interface connectable to a wall power source, and may receive AC power having a voltage set for each country from the wall power source and transmit it to the power transmission circuit 109 .

The control circuit 102 may control the magnitude of the power applied to the power transmission circuit 109 by controlling the magnitude of the bias voltage of the power amplifier. 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., which are various circuits capable of performing operations. It can be implemented, and there is no limitation in its type. The control circuit 102 may control at least one of the power source 106 or the power transmission circuit 109 to transmit, for example, a first amount of power.

The power receiving circuit 159 according to various embodiments of the present disclosure may wirelessly receive power from the power transmitting 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 for rectifying the received AC waveform power into a DC waveform, converting a voltage, or regulating power. The display 154 may display, for example, media data received from the media device 101 , and various hardware other than the display 154 may be included in the electronic device 150 . The control circuit 152 may control the overall operation of the electronic device 150 . The memory 156 may store instructions for performing the overall operation of the electronic device 150 , and may store information for determining the amount of power to be transmitted. Display 154 includes, for example, a liquid crystal display (LCD), a light emitting diode (LED) display, an organic light emitting diode (OLED) display, or a microelectromechanical system (MEMS) display, or an electronic paper display. can do. The control circuit 152 may receive media data through the communication circuit 153 . The control circuit 102 may control the media data received through the media data interface 108 to be transmitted to the electronic device 150 through the communication circuit 103 . The control circuit 102 may receive media data from a peripheral device via the media data interface 108 in a wired or wireless manner. The control circuit 102 may include the received media data in the communication signal and transmit it to the electronic device 150 through the communication circuit 103 . The control circuit 102 may control the received media data to be transmitted to the electronic device 150 after transcoding, decoding, or performing image enhancement processing. When the wireless power transmission device and the media device are implemented as different entities, the control circuit 152 may receive media data from the media device through the media data interface 160 by wire or wirelessly.

The memory 105 may store instructions for performing an operation of the wireless power transmission apparatus 100 , and may store, for example, information for determining the amount of power to be transmitted. 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 implementation form.

The control circuit 102 , the power transmission circuit 109 , the communication circuit 103 , the memory 105 , and the like of the wireless power transmission apparatus 100 may operate using power from the power source 106 . The wireless power transmission apparatus 100 according to various embodiments of the present disclosure may further include other coils in addition to the power transmission coil in the power transmission circuit 109 . In another coil, an induced electromotive force may be generated by a magnetic field generated from the power transmission coil, and the generated induced electromotive force is selected from among the control circuit 102 , the power transmission circuit 109 , the communication circuit 103 , or the memory 105 . At least one may be provided. The winding ratio of the coil for power transmission and the other coil may be manufactured by setting, for example, according to the ratio of the voltage of the power provided from the wall power source and the voltage used in each of the hardware. to be described in detail.

The electronic device 150 according to various embodiments of the present disclosure may include a plurality of coils in the power receiving circuit 159 . An induced electromotive force may be generated in each of the plurality of coils by the magnetic field generated from the power transmission coil, and the generated induced electromotive force is applied to the control circuit 152 , the power transmission circuit 159 , the communication circuit 153 , and the memory 156 . Alternatively, it may be provided on at least one of the displays 154 . The number of turns of each of the plurality of coils may be different.

3B is a block diagram of a power transmitting circuit and a power receiving circuit according to an inductive or resonant method according to various embodiments of the present disclosure.

In various embodiments of the present disclosure, the power transmission circuit 109 may include a power generation circuit 312 , a coil 313 , and a matching circuit 314 . The power generation circuit 312 may firstly rectify AC power received from the outside, then invert the rectified power again to provide it to the coil. By the inverting operation, a maximum voltage or a voltage of zero may be alternately applied to the coil 313 at a preset period, and accordingly, a magnetic field may be generated from the coil 313 . The inverting frequency, that is, the frequency of the AC waveform applied to the coil 313 may be set to 100 to 205 kHz or 6.78 MHz according to a standard, but there is no limitation. When power is applied to the coil 313 , an induced magnetic field whose magnitude changes with time may be formed from the coil 313 , and thus power may be wirelessly transmitted. Although not shown, capacitors constituting a resonance circuit together with the coil 313 may be further included in the power transmission circuit 109 . The matching circuit 314 changes at least one of a capacitance or a reactance of a circuit connected to the coil 313 under the control of the control circuit 102 so that the power transmitting circuit 109 and the power receiving circuit 159 are connected to each other. Impedance matching can be achieved. In the coil 321 of the power receiving circuit 159, an induced electromotive force may be generated by a magnetic field that changes in size according to time formed around it, and accordingly, the power receiving circuit 159 may receive power wirelessly. . The rectifying circuit 322 may rectify the received AC waveform power. The converting circuit 323 may adjust the voltage of the rectified power and transmit it to hardware. The power receiving circuit 159 may further include a regulator, or the converting circuit 323 may be replaced with a regulator. The matching circuit 324 changes at least one of a capacitance or a reactance of a circuit connected to the coil 321 according to the control of the control circuit 152 so that the power transmitting circuit 109 and the power receiving circuit 159 are connected to each other. Impedance matching can be achieved. Alternatively, the induced electromotive force generated in another coil may be provided to the control circuit 152 or the like.

3C is a block diagram of a power transmitting circuit and a power receiving circuit according to an electromagnetic wave method according to various embodiments of the present disclosure.

In various embodiments of the present disclosure, the power transmission circuit 109 may include an amplifier circuit 331 , a distribution circuit 332 , a phase shifter 333 , and an antenna array 334 for power transmission. have. In various embodiments of the present disclosure, the power receiving circuit 159 may include an antenna 341 for receiving power, a rectifying circuit 342 , and a converting circuit 343 .

The amplification circuit 331 may amplify the power provided from the power source 106 and provide it to the distribution circuit 332 . The amplification circuit 331 may be implemented with various amplifiers, such as a drive amplifier (DA), a high power amplifier (HPA), or a gain block amplifier (GBA), or a combination thereof, and the implementation is not limited. The distribution circuit 332 may distribute the power output from the amplifier circuit 331 to a plurality of paths. The distribution circuit 332 is not limited as long as it is a circuit capable of distributing input power or signals to a plurality of paths. For example, the distribution circuit 332 may distribute power through paths as many as the number of patch antennas included in the power transmission antenna array 334 . The phase shifter 333 may shift the phase (or delay) of each of the plurality of AC powers provided from the distribution circuit 332 . The number of phase shifters 333 may be plural, for example, the number of patch antennas included in the antenna array 334 for power transmission. The phase shifter 333 may be, for example, a hardware device such as HMC642 or HMC1113. A shift degree of each of the phase shifters 333 may be controlled by the control circuit 102 . The control circuit 102 may determine the position of the electronic device 150 , and the RF wave may The phase of each of the plurality of AC powers may be shifted to constructively interfere, that is, to be beam-formed. Each of the plurality of patch antennas included in the power transmission antenna array 334 may generate sub-RF waves based on the received power. The RF wave interfering with the sub RF wave may be converted into current, voltage, or power by the power reception antenna 341 and output. The power reception antenna 341 may include a plurality of patch antennas, and may generate an AC waveform current, voltage or power using an RF wave formed around it, that is, an electromagnetic wave, which will be referred to as received power. can The rectifier circuit 342 may rectify the received power into a DC waveform. The converting circuit 343 may increase or decrease the voltage of the power of the DC waveform to a preset value and output it to the PMIC 155 .

At least one of the power transmission circuit 109 or the power reception circuit 159 according to various embodiments of the present invention includes both hardware by the induction method or resonance method according to FIG. 3B and the hardware by the electromagnetic wave method according to FIG. 3C. may include In this case, the control circuit 102 or the control circuit 152 may select a charging method according to various conditions to control hardware corresponding to the selected charging method to be driven. Alternatively, the control circuit 102 or the control circuit 152 may use both an induction method or a resonance method and an electromagnetic wave method, and may transmit/receive power by driving all included hardware.

4 is a block diagram of an apparatus for transmitting power wirelessly according to various embodiments of the present invention.

The wireless power transmission apparatus 100 may be connected to the wall power source 401 by wire. The wall power source 401 may provide AC power with a predetermined voltage value. For example, the wall power source 401 may provide an AC power of 220Vrms, but a person skilled in the art will readily understand that there is no limit to the size of the AC power. The power processing circuit 400 may process the power received from the wall power source 401 . In various embodiments of the present disclosure, the power processing circuit 400 may include a rectifying circuit for rectification and an inverting circuit capable of inverting the rectified power. The power processing circuit 400 may rectify, for example, AC power of 220Vrms, and thus may be converted into DC power of 311V. Direct current power may be applied to the inverting circuit. The inverting circuit may provide the DC power during the first time period according to the control signal from the signal generating circuit, and may not provide the DC power during the second time period after the first time period has elapsed. The first time period and the second time period may be substantially the same and may be determined according to a frequency for wireless power transmission. When the inverting circuit is a half bridge DC/AC conversion circuit, AC power of, for example, 110Vrms may be applied to the first coil 411 . A magnetic field may be induced in the first coil 411 by the applied AC power. The second coil 412 may be disposed in the vicinity of the first coil 411 . An induced electromotive force, that is, AC power, may be generated in the second coil 412 by a portion of the magnetic field generated from the first coil 411 . A voltage value of AC power generated in the second coil 412 may be determined by a turns ratio between the first coil 411 and the second coil 412 . Equation 1 represents an equation for explaining the electromagnetic induction phenomenon.

In Equation 1, V1 is a voltage applied to the first coil 411, V2 is a voltage applied to the second coil 412, N1 is the number of turns of the first coil 411, N2 is the second coil 412 ) can represent the number of turns. Accordingly, the magnitude of the voltage of the AC power generated in the second coil 412 may be N2/N1 times the voltage applied to the first coil 411 . The magnitude of the voltage required by each of the hardware (eg, the control circuit 102 , the communication circuit 103 , or the power processing circuit 400 ) included in the wireless power transmission device 100 may be known in advance. The turns ratio of the first coil 411 and the second coil 412 may be determined according to the magnitude of the voltage required by the hardware. For example, the inverting circuit of the power processing circuit 400 may require DC power of 15V. Accordingly, the power output from the second coil 412 may have to have 10.6Vrms, the turns ratio N2/N1 may be 10.6/110, for example, 0.0964, and the first coil ( 411) and the second coil 412 may be manufactured. Although not shown, at least one rectifying circuit may be connected to the output terminal of the second coil 412 , so that DC power is provided to at least one of the control circuit 102 , the communication circuit 103 , and the power processing circuit 400 . can be The first coil 411 and the second coil 412 may be wound on one core. The first coil 411 and the second coil 412 may be wound on the same portion of one core, or each may be wound on a different portion of one core. The first coil 411 and the second coil 412 may be wound on each of the plurality of cores.

5A-5C illustrate a coil in accordance with various embodiments of the present invention.

Referring to FIG. 5A , the first coil 501 in the power transmission circuit 109 of the wireless power transmitter 100 may be a coil for power transmission. A voltage of V1 may be applied to the first coil 501 . In addition, the second coil 502 in the power transmission circuit 109 is a coil for providing power to hardware included in the wireless power transmission device 100 or hardware connected by wire to the wireless power transmission device 100 . can As described above, an induced electromotive force may be generated in the second coil 502 by a magnetic field whose magnitude is changed according to time generated from the first coil 501 . The magnitude of V2 applied to the second coil 502 may be determined according to the turns ratio between the first coil 501 and the second coil 502 . The electronic device 150 may include a third coil 503 for receiving power, and the third coil 503 is also generated from the first coil 501 by a magnetic field whose size changes according to time. An induced electromotive force may be generated in the coil 503 , and a voltage of V3 may be applied to the third coil 503 . Meanwhile, in FIG. 5A, one end of the coils 501, 502, and 503 is illustrated as being grounded, but this is merely for convenience of description, and both ends of at least one of the coils 501, 502, and 503 may be all one hardware connected, both ends It may be connected to each of the plurality of hardware.

Referring to FIG. 5B , the first capacitor 511 may be connected to the first coil 501 , and the second capacitor 512 may be connected to the second coil 502 . Accordingly, the first coil 501 and the first capacitor 511 may constitute a first resonant circuit, and the first resonant circuit may have a resonant frequency of the first frequency f1. The second coil 501 and the second capacitor 512 may also constitute a second resonant circuit, and the second resonant circuit may also have a resonant frequency of the first frequency f1 . As described above, the number of turns of the second coil 502 may be different from the number of turns of the first coil 501 . In this case, the reactance of the first coil 501 and the reactance of the second coil 502 are also may be different. To have the same resonant frequency, the capacitance of the first capacitor 511 and the second capacitance 512 may also be set differently. As shown in FIG. 5B , in the case of configuring the resonance circuit, the Q-factor of the induced electromotive force generated in the second coil 502 may be improved. Meanwhile, in FIG. 5B , each of the capacitors 511 and 512 is illustrated as being connected in series to each of the coils 501 and 502 , but this is merely exemplary, and in various embodiments of the present invention, each of the capacitors 511 and 512 , respectively may be connected in series or parallel to each of the coils 501 and 502 .

Referring to FIG. 5C , the first coil 521 for power transmission of the wireless power transmitter 100 may generate a magnetic field whose size changes with time based on applied AC power. One end of the second coil 522 of the wireless power transmitter 100 may be grounded. Based on the magnetic field that is generated from the first coil 521 and changes in size according to time, an induced electromotive force may be generated in the second coil 522 , and the induced electromotive force is rectified, for example, of the wireless power transmitter 100 . It may be provided as at least one of hardware (eg, a control circuit, a communication circuit, a power processing circuit, etc.). The third coil 531 and the fourth coil 532 of the electronic device 150 receiving wireless power may be connected to each other. In this case, the power received from the third coil 531 and the fourth coil 532 may be processed and used to operate the electronic device 150 or to charge the internal battery. In various embodiments of the present disclosure, the third coil 531 and the fourth coil 532 may not be connected to each other. When the number of turns of the third coil 531 and the fourth coil 532 is different, the magnitude of the voltage of the induced electromotive force generated in the third coil 531 and the voltage of the induced electromotive force generated in the fourth coil 532 are different from each other. The size may be different. For example, the induced electromotive force generated by the third coil 531 may be rectified and provided to first hardware (eg, a display) of the electronic device, and the induced electromotive force generated from the fourth coil 532 may be rectified to be electronic It may be provided as second hardware (eg, communication circuitry) of the device. Accordingly, the electronic device 150 may provide a voltage required for each of the plurality of hardware devices without including a plurality of down-converting circuits.

6A-6D illustrate a plurality of coil arrangements in accordance with various embodiments of the present invention.

Referring to FIG. 6A , a first coil 611 may be wound around the first core 601 . The first coil 611 may be a covered electric wire. A tape 602 for fixing the first coil 611 to the first core 601 may be attached to at least a portion of the first core 601 and at least a portion of the first coil 611 . The first core 601 and the second core 621 may be formed of a material having a relatively high permeability. The first core 601 and the second core 621 may be made of, for example, a material such as ferrite, and any material capable of increasing magnetic flux is not limited. The second coil 612 may be wound on the outside of the first coil 611 and on the tape 602 . The second coil 612 may also be a sheathed wire. The first coil 611 may be, for example, a coil for transmitting power, and the second coil 612 may be a coil for transmitting power to hardware, but there is no limitation on the location. In various embodiments of the present invention, a coil for transmitting power to hardware may be wound relatively inside, and a coil for power transmission may be wound relatively outside. The electronic device receiving power may include a second core 621 , and a third coil 622 may be wound around the second core 621 . As the tape 603 is attached to at least a portion of the third coil 622 and at least a portion of the second core 621 , the third coil 622 may be secured to the second core 621 . 6B and 6C , the first coil 632 may be positioned on the flat ferrite 631 , and the second coil 633 may be positioned on the second coil 632 . In this case, the ferrite may not be positioned inside the first coil 632 or the second coil 632 , but may be implemented in a stacked form. Referring to FIG. 6D , ferrite may be implemented in a form having a plurality of layers 641 , 642 , 643 , and 644 . A first coil 645 and a second coil 646 may be wound on at least one of the plurality of layers 641 , 642 , 643 , and 644 .

7 is a block diagram illustrating coils according to various embodiments of the present invention.

Referring to FIG. 7 , the power transmission circuit 109 of the wireless power transmission device 100 may include a first coil 701 for providing power to the electronic device 150 . A voltage of V1 may be applied to the first coil 701 . According to the AC power input to the first coil 701 , a magnetic field may be generated in the first coil 701 . Accordingly, an electronic device (not shown) located around the first coil 701 transmits power wirelessly. can be received as An induced electromotive force may also be generated in the second coil 702 and the third coil 703 located inside the wireless power transmitter 100 by the magnetic field generated in the first coil 701 . For example, the first hardware 711 of the wireless power transmission apparatus 100 may request an operating voltage of V2, and the second hardware 712 of the wireless power transmission apparatus 100 may request an operating voltage of V3. . The turns ratio between the first coil 701 and the second coil 702 and the turns ratio between the first coil 701 and the third coil 703 may be different, so that V2 from the second coil 702 is A voltage of may be output, and a voltage of V3 may be output from the third coil 703 . Although not shown, a rectifying circuit may be connected between the second coil 702 and the first hardware 711 , and a rectifying circuit may be connected between the third coil 703 and the second hardware 712 . Accordingly, each of the first hardware 711 and the second hardware 712 may receive a voltage of V2 and a voltage of V3. In various embodiments, the second coil 702 may output an AC current having a voltage V2 after rectification, and the second coil 702 may output an AC current having a voltage V3 after rectification. .

8A is a block diagram of an apparatus for transmitting power wirelessly according to various embodiments of the present disclosure. The wireless power transmitter 100 includes a rectifier circuit 802 , an inverter 803 , a first coil 804 , an MCU 805 , a start circuit 806 , a signal generation circuit 807 , a rectifier circuit 808 . and a second coil 809 . The rectifier circuit 802 of the wireless power transmitter 100 may receive AC power from an external power source 801 . The rectifying circuit 802 may rectify the received AC power and provide the rectified DC power to the inverter 803 . Alternatively, the rectifier circuit 802 may provide the rectified DC power to the startup circuit 806 . Upon initial drive, the rectifier circuit 802 may provide DC power to the startup circuit 806 . The signal generating circuit 807 may provide a control signal of the inverter 803 , and the inverter 803 may or may not apply the rectified DC power to the first coil 804 based on the received control signal. have. The signal generating circuit 807 may operate using the induced electromotive force generated in the second coil 809 after driving, but may not yet generate an induced electromotive force in the second coil 809 during initial driving. Accordingly, at the time of initial driving, the signal generating circuit 807 may receive power from the starting circuit 806 and use it. The startup circuit 806 may provide power for driving to the signal generating circuit 807 using the power provided from the rectifying circuit 802 . When the signal generating circuit 807 receives power and provides a control signal to the inverter 803 , then AC power may be applied to the first coil 804 according to the operation of the inverter 803 , and the second An induced electromotive force may also be generated in the coil 809 . AC power by the induced electromotive force may be rectified by the rectifying circuit 808 and provided to at least one of the MCU 805 , the startup circuit 806 , or the signal generating circuit 807 . The starting circuit 806 may be configured to stop providing power to the signal generating circuit 807 upon confirming that power is provided from the second coil 809 . The starting circuit 806 is not limited as long as it is a circuit capable of providing power from the rectifying circuit 802 to correspond to the driving voltage of the signal generating circuit 807 .

Referring to FIG. 8B , the inverter 811 may include a circuit for inverting and a signal generating circuit 807 . For example, the inverter 811 may convert a received DC current into an AC current and output the converted DC current without receiving a control signal from an external circuit. The inverter 811 may operate using the induced electromotive force generated in the second coil 809 after driving, but may not yet generate an induced electromotive force in the second coil 809 during initial driving. Accordingly, at the time of initial driving, the inverter 811 may receive power from the start-up circuit 806 and use it. The starting circuit 806 may provide power for driving to the inverter 811 by using the power provided from the rectifying circuit 802 . The inverter 811 may receive power and provide AC power to the first coil 804 using the received power. AC power by the induced electromotive force may be rectified by the rectifying circuit 808 and provided to at least one of the MCU 805 , the startup circuit 806 , and the inverter 811 . The start-up circuit 806 may be set to stop providing power to the inverter 811 upon confirming that power is being supplied from the second coil 809 .

The wireless power transmission apparatus 100 according to various embodiments of the present disclosure may include a battery therein. The internal battery may receive power from the second coil 809 and store the received power. Meanwhile, at the initial driving time, at least one of the inverter 803 and the signal generating circuit 807 may operate using power stored in the battery. In this case, the wireless power transmission apparatus 100 may not include the startup circuit 806 . Alternatively, when the wireless power transmitter 100 is not connected to the external power source 801 , it may operate using power stored in an internal battery.

9 shows a detailed circuit diagram of a startup circuit according to various embodiments of the present invention.

The rectifying circuit 902 may receive AC power from the external power source 901 , rectify it, and output the DC power through the power path 903 . A voltage of, for example, V3 may be applied at node 910 and node 917 of power path 903 . Resistors 905 and 906 may be connected to the power path 904 connected to the node 910 , and the resistance values of the resistors 905 and 906 may be determined such that a specific voltage (eg, Vref) is applied at the node 950 . . A switch 907 may be connected to the node 950 . When the voltage of the node 950 and the voltage of the node 911 are the same, the switch 907 may be controlled to be in an on state and the node 950 may be grounded. When the voltage of the node 950 and the voltage of the node 911 are different, the switch 907 is controlled to be in an off state, and the elements (eg, 903 and 909, ground) connected to the node 950 and the switch 907 and may be disconnected. At the time of initial driving, that is, when the inverter 940 starts performing the inverting operation, if circuits for starting are not included, AC power cannot be applied to the first coil 941 . Accordingly, an induced electromotive force may not be generated even in the second coil 942 , and the magnitude of the voltage applied to the terminal 930 may be zero. The terminal 930 may be interlocked with the terminal 920 , and the voltage of the terminal 930 may be the same as the voltage of the terminal 920 . Accordingly, the voltage of the terminal 920 may also be 0 when initially driven. As the voltage at terminal 920 is zero, the voltage at node 911 may be zero. Since the voltage Vref of the node 950 and the voltage (ie, 0) of the node 911 are different, the switch 907 is in an off state, and the voltage of the node 950 may maintain Vref. When the voltage of the node 950 is Vref, the switch 912 may be controlled to be on, and thus power may be provided from the node 917 to the node 918 through the power path 921 . have. The value of the resistor 915 and the breakdown voltage of the Zener diode 916 may be set such that the voltage at the node 951 becomes V2. Here, V2 may be an operating voltage of the signal generating circuit 990 . On the other hand, diodes 913 and 914 may prevent power from being provided from node 918 to node 950 . Accordingly, the signal generating circuit 990 may receive the voltage of V2, and using it, the high signal HG and the low signal LG may be periodically alternately provided to the inverter 940 . When the inverter 940 receives the high signal HG, it applies the DC power from the rectifier circuit 902 to the first coil 941 , and when it receives the low signal LG, the DC power from the rectifier circuit 902 . may not be applied to the first coil 941 . Accordingly, AC power may be applied to the first coil 941 , and an induced electromotive force may also be generated in the second coil 941 . AC power by the induced electromotive force may be rectified by the diode 943 . The value of the resistor 944 may be set such that the voltage of the rectified power has V2 while the voltage of the terminal 930 has V2. The position of the resistor 944 is not limited. Accordingly, the voltage of V2 output from the second coil 942 and rectified by the diode 943 may be provided to the signal generating circuit 990 , and the signal generating circuit 990 may use the received power to generate an inverter. (940) It is possible to generate and output a control signal. Since the voltage applied to the terminal 930 is V2, the voltage applied to the terminal 920 may also be V2. The values of resistors 903 and 909 may be set such that the voltage value at node 911 may be Vref. Accordingly, when V2 is applied to the terminal 920 , Vref may be applied to the node 911 . Since the voltage values of the node 911 and the node 950 are the same, the switch 907 is controlled to be turned on, and the node 950 may be connected to the ground. Accordingly, the voltage of the node 950 may not correspond to the on-state voltage of the switch 912 , and thus the switch 912 may be controlled to be in the off state. As the switch 912 is controlled to be in the off state, no power is provided through the power path 921 , and the supply of the V2 voltage to the node 951 may be stopped. Accordingly, after starting, the signal generating circuit 990 may operate using only the electromotive force induced from the second coil 942 .

10 illustrates a coil of an electronic device that wirelessly receives power according to various embodiments of the present disclosure.

The electronic device 150 according to various embodiments of the present disclosure may include a plurality of coils 1001 and 1002 in the power receiving circuit 159 . The number of turns of each of the plurality of coils 1001 and 1002 may be different. Each of the plurality of coils 1001 and 1002 may be wound on one core. The plurality of coils 1001 and 1002 may be wound on the same portion of one core, or each may be wound on a different portion of one core. The plurality of coils 1001 and 1002 may be wound on each of the plurality of cores. Since the number of turns of the coils 1001 and 1002 is different, the output terminal voltage V3 of the first coil 1001 and the output terminal voltage V4 of the second coil 1002 may also be different. The first hardware 1001 may use the output terminal voltage V3, and the second hardware 1002 may use the output terminal voltage V4. Although not shown, a rectifying circuit or a converting circuit may be connected between the coil and the hardware.

The electronic device 150 according to various embodiments of the present disclosure may include an internal battery. The internal battery may be coupled to the second coil 1002 , for example, and may receive power from the second coil 1002 . When the electronic device 150 does not receive a sufficient amount of power from the wireless power transmitter 100 , the electronic device 150 may operate hardware using power using an internal battery. Alternatively, when the voltage level of the power output from the rectifier circuit is unstable, the electronic device 150 may operate the hardware using the power stored in the internal battery. In various embodiments of the present disclosure, the electronic device 150 may include a first internal battery connected to the first coil 1001 and a second internal battery connected to the second coil 1002 . In this case, the electronic device 150 operates the first hardware 1011 using power from the first internal battery and operates the second hardware 1012 using power from the second internal battery. You may.

Claims (13)

A wireless power transmission device for wirelessly transmitting power to an external electronic device, comprising:
a first coil for wirelessly transmitting power to the external electronic device by generating a magnetic field and having a first number of turns;
a second coil that generates an induced electromotive force based on the magnetic field generated by the first coil and has a second number of turns different from the first number of turns; and
at least one piece of hardware;
The at least one hardware of the wireless power transmitter operates based on the induced electromotive force,
A ratio of a voltage applied to the first coil and a voltage applied to the second coil is determined according to a ratio of the number of first windings and the number of second windings. The method of claim 1,
A core on which the first coil and the second coil are wound
A wireless power transmission device further comprising a. 3. The method of claim 2,
The first coil is wound on the core, the wireless power transmission apparatus, characterized in that the second coil is wound on the outside of the first coil. The method of claim 1,
flat ferrite
further comprising,
The first coil is disposed on the flat ferrite, and the second coil is disposed on the first coil. The method of claim 1,
A rectifier circuit connected to the second coil and the at least one hardware, converting AC power by the induced electromotive force into DC power and providing it to the at least one hardware
A wireless power transmission device further comprising a. The method of claim 1,
A winding ratio between the first number of windings and the second number of windings is set according to a ratio between a voltage applied to the first coil and an operating voltage of the at least one hardware. The method of claim 1,
a first capacitor coupled to the first coil; and
a second capacitor coupled to the second coil
further comprising,
A resonant frequency of the resonant circuit formed by the first coil and the first capacitor is the same as the resonant frequency of the resonant circuit formed by the second coil and the second capacitor. The method of claim 1,
A third coil having a third number of turns different from the first number of turns and the second number of turns
further comprising,
Other hardware different from the at least one hardware of the wireless power transmitter is a wireless power transmitter, characterized in that it operates by the induced electromotive force generated in the third coil based on the magnetic field. The method of claim 1,
a rectifier circuit for receiving AC power from the outside and rectifying it into DC power;
an inverter that applies the DC power to the first coil during a first period and does not apply the DC power to the second coil during a second period; and
The inverter generates a first control signal for applying the DC power during the first period and a second control signal for preventing the inverter from applying the DC power during the second period, the first control signal and the A signal generating circuit that alternately provides a second control signal to the inverter
A wireless power transmission device further comprising a. 10. The method of claim 9,
When driving of the wireless power transmitter starts, power for the operation of the signal generating circuit is provided using the DC power from the rectifying circuit, and when the induced electromotive force is generated from the second coil, the signal generating circuit Startup circuit that stops providing power for operation
A wireless power transmission device further comprising a.
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