KR20220049352A - An apparatus and method for transmitting wireless power - Google Patents

Abstract

The present invention relates to a device for transmitting wireless power and a method thereof. To this end, a wireless power transmitting device of the present invention obtains a frequency of a voltage outputted from a resonator based on a pulse inputted to a first terminal of an amplifier included in the resonator, calculates inductance of a transmitting coil for transmitting wireless power based on the obtained frequency, and can determine whether a wireless power receiving device for receiving the wireless power exists based on the calculated inductance. Therefore, according to the present invention, it is possible to determine whether the wireless power receiving device exists with constant power without changing power of an inverter.

Description

Apparatus and method for transmitting wireless power {AN APPARATUS AND METHOD FOR TRANSMITTING WIRELESS POWER}

The present invention relates to an apparatus and method for wireless power transmission.

In general, a wireless power transmitter wirelessly provides power to a wireless power receiver, and the wireless power receiver receives wireless power transmitted from the wireless power transmitter and charges a battery.

In this way, the wireless power transmitter and the wireless power receiver can supply and receive power through radio waves without a separate wire, and these wireless charging technologies are continuously being applied in various ranges. In addition, recently, a user can conveniently move to a desired destination through a personal mobile device, which is a personal transportation means, and the personal mobile device is managed and stored in a separate docking device.

The conventional first patent document (KR-2020-0026493) only discloses the contents of a personal mobile device, but does not disclose the wireless-based power transmission/reception with the docking device.

In addition, the prior art second patent document (KR 10-1912692) discloses the contents of spreading the frequency spectrum by periodically changing the frequency of the wireless power signal to lower the magnetic field strength in a specific frequency region, and wireless communication with the docking device It does not disclose power transmission/reception based on .

As described above, since the conventional personal mobile device is charged through a wired connection with the docking device, there is a risk of electric leakage or electric shock due to external exposure of the charging terminal, as well as restrictions on use such as waterproof measures.

Accordingly, the need for charging through a wireless connection between the personal mobile device and the docking device and the need for the wireless power transmitting device to determine the existence of the wireless power receiving device are raised.

(Patent Document 1) Korean Patent Laid-Open Publication No. 10-2020-0026493 (Patent Document 2) Korean Patent Registration 10-1912692

Accordingly, the present invention provides an apparatus and method for wireless power transmission.

Another object of the present invention is to provide a wireless power transmitter for detecting a wireless power receiver.

Another object of the present invention is to provide a control algorithm for starting and controlling wireless charging between a wireless power transmitter and a wireless power receiver.

Also, according to the present invention, a wireless power transmitter determines whether a wireless power receiver exists.

Another aspect of the present invention is to detect attachment/detachment of the wireless power receiver using low power compared to the wireless power transmitted by the wireless power transmitter to the wireless power receiver.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the appended claims.

In order to achieve the above, the apparatus for transmitting power wirelessly according to the present invention may detect the apparatus for receiving power wirelessly by detecting the resonance frequency of the transmitting coil.

Also, the apparatus for transmitting power wirelessly according to the present invention may identify whether the apparatus for receiving power wirelessly exists or does not exist by identifying the frequency of the output voltage of the resonator.

Also, the apparatus for transmitting power wirelessly according to the present invention may obtain an identifier of the apparatus for receiving power wirelessly and determine whether the apparatus for receiving power wirelessly is valid.

To this end, the wireless power transmission apparatus of the present invention may include a resonator and a processor electrically connected to the resonator.

According to an embodiment, the processor may obtain a frequency of a voltage output from the resonator based on a pulse input to a first terminal of an amplifier included in the resonator. In addition, the processor may calculate an inductance of a transmitting coil for transmitting wireless power based on the obtained frequency, and based on the calculated inductance, determine whether there is a wireless power receiving device receiving the wireless power. .

The present invention may identify a wireless power receiving device mounted on a docking device.

In addition, the wireless power transmitter according to the present invention can determine the existence of the wireless power receiver with constant power without changing the power of the inverter.

In addition, since the wireless power transmission apparatus according to the present invention can determine whether the wireless power reception apparatus exists or does not exist with constant power, power consumption can be prevented.

In addition, the wireless power transmission device according to the present invention operates the first switch in the inverter to be OFF and the second switch is turned ON to block the wireless power transmitted to the transmission coil, thereby preventing malfunction of the wireless power transmission device can do.

In addition, the wireless power transmitter according to the present invention applies a voltage of a square wave to the second capacitor connected to the first terminal of the OP amp of the resonator, and inputs the output pulse to the first terminal of the OP amp, a predetermined voltage The attachment/detachment of the wireless power receiver can be detected through a voltage of (eg, 5V) or less.

In addition, when it is determined that the wireless power receiver exists, the wireless power transmitter according to the present invention performs pairing with the wireless power receiver to obtain an identifier of the wireless power receiver, thereby validity can be judged.

In addition to the above-described effects, the specific effects of the present invention will be described together while describing specific details for carrying out the invention below.

1 is a schematic diagram showing a wireless charging system according to an embodiment of the present invention.
2 is a block diagram of a wireless charging system according to an embodiment of the present invention.
3 is a schematic block diagram of an apparatus for transmitting power wirelessly according to an embodiment of the present invention.
4 is a detailed block diagram of an apparatus for transmitting power wirelessly according to an embodiment of the present invention.
5 is a block diagram of a power transmitter of a wireless power transmitter according to an embodiment of the present invention.
6 is a block diagram of a power transmitter of a wireless power transmitter according to another embodiment of the present invention.
7 is an exemplary diagram illustrating a waveform of a voltage output from a resonator according to an embodiment of the present invention.
8 is a block diagram of an apparatus for transmitting power wirelessly and an apparatus for receiving power wirelessly according to an embodiment of the present invention.
9 is a flowchart illustrating a process in which a wireless power transmitter determines whether a wireless power receiver is present according to an embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from other components, and unless otherwise stated, it goes without saying that the first component may be the second component.

In addition, when it is described that a component is “connected”, “coupled” or “connected” to another component, the components may be directly connected or connected to each other, but other components are “interposed” between each component. It should be understood that “or, each component may be “connected,” “coupled,” or “connected,” through another component.

Throughout the specification, unless otherwise stated, each element may be singular or plural.

As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components or various steps described in the specification, some of which components or some steps are It should be construed that it may not include, or may further include additional components or steps.

Throughout the specification, when “A and/or B” is used, it means A, B or A and B, unless otherwise stated, and when “C to D” is used, it means that there is no specific opposite description. Unless otherwise specified, it means that it is greater than or equal to C and less than or equal to D.

Hereinafter, an apparatus and method for transmitting power wirelessly and an apparatus and method for receiving power wirelessly according to some embodiments of the present invention will be described.

1 is a schematic diagram showing a wireless charging system according to an embodiment of the present invention.

Referring to FIG. 1 , a wireless charging system 100 according to an embodiment of the present invention includes a docking device 120 capable of docking a personal mobile device 140 , and wireless power transmission mounted on the docking device 120 . It may include a device 110 , a wireless power receiving device 130 receiving wireless power from the wireless power transmitting device 110 , and a personal mobile device 140 equipped with the wireless power receiving device 130 . .

According to an embodiment, when the personal mobile device 140 is docked (eg, mounted, contacted, or adjacent) to the docking device 120 , the wireless power transmission device 110 attached to the docking device 120 . ) may wirelessly supply power to the wireless power receiving device 130 .

According to an embodiment, the docking device 120 includes a cradle capable of fixing the personal mobile device 140 . In addition, the wireless power transmitter 110 capable of providing wireless power to the wireless power receiver 130 mounted on the personal mobile device 140 may be mounted on one side of the docking device 120 . .

According to an embodiment, the wireless power transmitter 110 measures a current of a transmission coil included in the wireless power transmitter 110, and when the measured current exceeds a threshold current, the wireless power receiver It may communicate with the device 130 . And, based on communication with the wireless power receiver 130 , the wireless power transmitter 110 may obtain the identifier of the wireless power receiver 130 and determine whether the obtained identifier is valid. . For example, the wireless power transmitter 110 may determine the validity of the identifier of the wireless power receiver 130 to determine whether wireless power may be transmitted to the wireless power receiver 130 . .

According to an embodiment, the wireless power transmitter 110 determines the frequency of the voltage output from the resonator based on a pulse input to the first terminal of the amplifier included in the resonator of the wireless power transmitter 110 . can be obtained In addition, the wireless power transmitter 110 calculates an inductance of a transmission coil for transmitting wireless power based on the obtained frequency, and based on the calculated inductance, a wireless power receiver for receiving the wireless power ( 130) can be determined.

According to an embodiment, when it is determined that the wireless power receiver 130 exists, the wireless power transmitter 110 may perform pairing with the wireless power receiver 130 . In addition, the wireless power transmitter 110 receives the identifier of the wireless power receiver 130 based on pairing with the wireless power receiver 130 , and receives the wireless power based on the received identifier Device 130 may determine whether it is valid.

According to an embodiment, when it is determined that the obtained identifier is valid, the wireless power transmitter 110 may provide wireless power to the wireless power receiver 130 . The wireless power transmission may be performed while the personal mobile device 140 is docked with the docking device 120 .

According to an embodiment, one surface (eg, a surface adjacent to the transmitting coil) of the wireless power transmitting device 110 is a height or The area may correspond.

According to an embodiment, the wireless power receiver 130 is disposed on one side of the personal mobile device 140 , and may receive wireless power from the wireless power transmitter 110 and charge the battery.

According to an embodiment, the charging voltage of the wireless power receiver 130 may have a voltage in a predetermined range (eg, 30V to 42V), and the charging current may be 2A.

According to an embodiment, the personal mobile device 140 may mean a personal mobile means. The personal movement device 140 includes, for example, an electric wheel, an electric kickboard, an electric skateboard, an electric bicycle, and the like, and may include a moving means for one person mainly driven by electricity. And, the docking device may be formed to correspond to the structure of such a personal transportation means. In addition, the personal mobile device 140 may be equipped with a wireless power receiving device 130 for receiving wireless power and storing the received wireless power on one side.

2 is a block diagram of a wireless charging system according to an embodiment of the present invention.

Referring to FIG. 2 , a wireless charging system 100 according to an embodiment of the present invention includes a wireless power transmitter 110 mounted on a docking device 120 and a wireless power receiver mounted on a personal mobile device 140 . 130 may be included.

The configuration of the wireless charging system 100 shown in FIG. 2 is according to an embodiment, and the components of the wireless charging system 100 are not limited to the embodiment shown in FIG. 2 , and some components as needed may be added, changed or deleted.

According to an embodiment, the wireless power transmitter 110 includes a power supply unit 211 , a power transmitter 212 , a communication unit 213 , a storage unit 214 , an output unit 215 , and a processor 216 . may include

According to an embodiment, the power supply unit 211 may receive AC power (eg, 110V to 220V) supplied from the outside and supply it to the power transmitter 212 under the control of the processor 216 . The power supply unit 211 may generally receive power from a system (not shown). For example, the power supply unit 416 may include a plug that can be connected to a terminal of the system to receive power from the system.

According to an embodiment, the power transmitter 212 may wirelessly provide power requested by the wireless power receiver 130 to the wireless power receiver 130 . The power transmitter 212 may wirelessly supply AC waveform power (eg, AC voltage) to the wireless power receiver 130 . The power transmitter 212 converts the power of the DC waveform into an AC waveform using an inverter included in the power transmitter 212 , and transmits the converted wireless power of the AC waveform to the power included in the power transmitter 212 . It may be supplied to the wireless power receiver 130 through the coil. The power transmitter 212 may include various components capable of providing AC waveform power.

According to an embodiment, the power transmitter 212 converts a first AC voltage (eg, AC 110V to AC 220V) having a first frequency (eg, 60Hz) applied from the power supply 211 into a DC voltage. and a second frequency (eg, several GHz to several tens of GHz) greater than the first frequency (eg, 60 Hz) in order to supply the converted DC voltage to the wireless power receiving device 130 . It may include an inverter that converts the second AC voltage. The power transmitter 212 may or may not selectively include the power factor improving unit.

According to an embodiment, the power transmitter 212 is a transmitting coil that supplies wireless power to the wireless power receiving device 130 based on the converted second AC voltage and a current that measures a current in the transmitting coil. It may include a measurement unit.

According to an embodiment, the communication unit 213 may communicate with the communication unit 223 of the wireless power receiving apparatus 130 in a predetermined manner. The communication unit 213 may receive power information on the wireless power receiver 130 from the wireless power receiver 130 . The power information may include at least one of output voltage information, charging current information, and an identifier of the wireless power receiving device 101 . Alternatively, the power information is provided in the SA (Stand Alone) mode, which operates by default without the input of the wired charging terminal, RS485 communication, SM (Slave Mode) (or NSA (Non Stand Alone) that allows operation control through RS485 communication in the control system (not shown) ) mode), error condition release, control signal for wireless charging control, charging frequency of the transmission coil included in the power transmitter 212, voltage, and information such as measurement values for transmitted power. The wireless power transmitter 110 may adjust the power supplied to the wireless power receiver 130 through the power information.

According to an embodiment, the communication unit 213 may transmit a control signal for controlling the charging function of the wireless power receiver 130 . The communication unit 213 may communicate with the wireless power receiver 130 through a frequency (out-band) different from the frequency of the wireless power signal. The control signal may include a control signal for controlling the power receiver 222 of the specific wireless power receiver 130 to enable or disable the charging function.

According to an embodiment, the communication unit 213 may transmit and receive signals through a communication channel (eg, RS485) with a control system (not shown) as well as the wireless power receiving device 130 . The communication unit 213 may transmit various information or signals about the wireless power receiver 130 to the control system (not shown). The control system (not shown) may include a device (eg, a central control device) that controls or manages overall operations of a plurality of wireless power transmission devices.

According to an embodiment, the storage unit 214 may include a volatile and/or non-volatile memory. The storage unit 214 may store, for example, commands or data related to at least one other component of the wireless power transmission apparatus 110 . The storage unit 214 may store at least some of commands, algorithms, software, and programs necessary for wirelessly supplying power to the wireless power receiver 130 .

According to an embodiment, the storage unit 214 may store various pieces of information received from the wireless power receiver 130 . Also, the storage unit 214 may store various information received from a control system (not shown).

According to an embodiment, the output unit 215 is a state of the wireless power receiver 130 based on a signal received from the wireless power receiver 130 through the communication unit 213 under the control of the processor 216 . (eg, charging, charging completion time, charging rate, etc.) can be displayed. Also, under the control of the processor 216 , the output unit 215 may display an expected time until the wireless power receiver 130 is fully charged in real time.

According to an embodiment, when various information (eg, information indicating a matching or mismatching state) received from the wireless power receiving device 130 is received, the output unit 215 alerts the user according to the received information (eg, : It may include a speaker (not shown) and/or a display device (not shown) that can be provided through broadcast, sound, screen display, etc.).

According to an embodiment, the output unit 215 displays messages indicating various states of the wireless power receiver 130 , that is, a booting message (eg, charging is ready), a charging message (eg, starting charging). ), dismounting instructions (eg, please drive safely), charging error messages (eg, please try charging again), stop messages (eg, please use a different charger), and charging stop messages due to other errors (eg: Charging has been stopped), etc., can be displayed on the display, or the content of the message can be outputted by voice through the speaker. Also, the output unit 215 may emit light of at least one LED included in the output unit 215 in at least one color based on the output of the message.

According to an embodiment, the output unit 215 is when the docking device 120 is on standby, when it is stopped, when it is docked with the personal mobile device 140, when the docking is incomplete, when charging starts, When charging, when charging is stopped, when charging is complete, various information can be displayed or output by voice.

According to an embodiment, the processor 216 may control overall operation of the wireless power transmitter 110 . The processor 216 may control the overall operation of the wireless power transmitter 110 by using an algorithm, program, or application required for control read from the storage 214 (eg, memory). The processor 216 may be implemented in the form of a CPU, a microprocessor, or a mini computer.

According to an embodiment, the processor 216 executes a wireless charging transmission mode through a control, communication-related operation or data processing and/or transmission coil of at least one other component of the wireless power transmission device 110 or can be controlled The processor 216 may control a power transmission mode for supplying power to the wireless power receiver 130 . The processor 216 may acquire battery information (eg, remaining battery level, etc.) of the wireless power receiver 130 .

According to an embodiment, when the power transmitter 212 includes a plurality of transmission coils, the processor 216 selects a transmission coil corresponding to the wireless power receiver 130 from among the plurality of transmission coils, Wireless power may be supplied to the wireless power receiver 130 through the selected transmission coil.

According to an embodiment, the processor 216 outputs information about various states of the wireless power receiver 130 to the output unit 215 based on a signal received from the wireless power receiver 130 through the communication unit 213 . ) can be indicated by Also, the processor 216 may display an expected time until the wireless power receiver 130 is fully charged through the output unit 215 . When various information (eg, information indicating a matching or mismatching state) received from the wireless power receiving device 130 is received, the processor 216 provides an alarm (eg, jinson, sound, screen display) to the user according to the received information. etc.) can be provided.

According to an embodiment, the processor 216 is configured to generate a voltage output from the resonator based on a pulse input to a first terminal of an amplifier in a resonator included in the power transmitter 212 of the wireless power transmitter 110 . frequency can be obtained. Then, the processor 216 calculates the inductance of the transmitting coil for transmitting wireless power based on the obtained frequency, and based on the calculated inductance, the wireless power receiving device 130 for receiving the wireless power. presence can be determined.

According to an embodiment, the processor 216 may turn off the first switch in the inverter and turn on the second switch to cut off the wireless power transferred to the transmission coil. Then, the processor 216 reduces the time during which the first switch is turned ON so that the voltage of the first capacitor connected between one end of the transmitting coil and the ground becomes less than or equal to a predetermined voltage, and the first switch is turned ON. The time during which the second switch is turned OFF may be increased to be in inverse proportion to the operating time.

For example, when the voltage of the first capacitor is equal to or less than the predetermined voltage, the processor 216 may turn on a third switch disposed between the transmitting coil and the resonator.

According to an embodiment, the processor 216 applies a voltage of a square wave to a second capacitor connected to the first terminal in the inverter, and based on the voltage of the square wave applied to the second capacitor, from the second capacitor The output pulse may be input to the first terminal of the amplifier. In addition, the processor 216 may calculate the inductance of the transmission coil using the voltage of the first capacitor. For example, when the calculated inductance is greater than a predetermined value, the processor 216 may determine that the wireless power receiver is adjacent to the wireless power transmitter.

According to an embodiment, when it is determined that the wireless power receiving device 130 exists, the processor 216 performs pairing with the wireless power receiving device, and based on the pairing, the wireless power receiving device 130 ) can be obtained.

According to an embodiment, the processor 216 may measure a current of a transmission coil included in the power transmitter 212 and identify whether the measured current exceeds a threshold current. And, when it is identified that the measured current does not exceed the threshold current, the processor 216 communicates with the wireless power receiver 130 and based on the communication with the wireless power receiver 130 . to obtain the identifier of the wireless power receiving apparatus 130 .

According to an embodiment, the processor 216 identifies whether the obtained identifier is valid, and when it is determined that the obtained identifier is valid, transmits the power supplied through the power supply unit 211 to the power transmitter 212 . After controlling through , the controlled power may be wirelessly provided to the wireless power receiver 130 .

According to an embodiment, the processor 216 measures the inductance change amount of the transmission coil of the power transmitter 212 and compares the measured inductance change amount and the threshold change amount to a power factor improving unit in the power transmitter 212 and It may be determined whether at least one of the inverters is active. For example, when the measured inductance change amount is greater than the threshold change amount, the processor 216 may activate the power factor improving unit and the inverter of the power transmitter 212 .

According to an embodiment, when the measured inductance change amount is greater than the threshold change amount, the processor 216 determines that the personal mobile device 140 to which the wireless power receiver 130 is attached is attached to the wireless power transmitter. It can be identified as being docked in a docked device. When the receiving coil of the wireless power receiving device 130 approaches the transmitting coil of the wireless power transmitting device 110 , the processor 216 detects a change in inductance in the transmitting coil of the power transmitting unit 212 . can do. The inductance may be changed in inverse proportion based on the distance between the two coils. For example, as the distance increases, the amount of change in inductance may increase.

According to an embodiment, when the measured inductance change amount is not greater than the threshold change amount, the processor 216 may identify that the personal mobile device 140 is detached from the docking device 120 . Alternatively, when the measured inductance change amount continuously decreases, the processor 216 may identify that the personal mobile device 140 is being detached from the docking device 120 .

According to an embodiment, the processor 216 may activate the inverter in the power transmitter 212 based on the identification of an inductance change greater than the threshold change. The processor 216 activates an inverter in the power transmitter 212 based on the identification of an inductance change greater than the threshold change, and a first AC voltage (eg, AC 110V to AC 220V) through the activated inverter may be converted into a second AC voltage (eg, DC 400V) applied to the wireless power receiver 130 .

According to an embodiment, the processor 216 measures a current of a transmission coil included in the power transmitter 212, and based on the measured current exceeding a threshold current, performs communication with the wireless power receiver can do. The threshold current may be a current required to transmit wireless power. The processor 216 compares the current of the transmitting coil with the threshold current, and when the current of the transmitting coil is greater than the threshold current, it can be identified that a foreign material is attached to the wireless power transmitting device 110 . .

According to an embodiment, when the current of the transmitting coil is not greater than the threshold current, the processor 216 establishes a communication channel with the wireless power receiver 130 through the communication unit 213, and the set communication Communication with the wireless power receiver 130 may be started through the channel. In addition, the processor 216 may calculate a communication time and determine whether the calculated communication time exceeds a threshold time. The threshold time may be a loading time (eg, 1 second) of a component required for the wireless power receiver 130 to receive wireless power.

According to an embodiment, the processor 216 obtains the identifier of the wireless power receiver 130 based on the calculated communication time exceeding the threshold time, and identifies whether the obtained identifier is valid. can

According to an embodiment, the processor 216 transmits information including the identifier of the wireless power receiver 130 from the wireless power receiver 130 to the communication unit 213 (or through in-band communication). can be received through The information may include at least a part of a printed circuit board (PCB) version, a firmware version, and information on whether a normal operation is possible of the wireless power receiver 130 .

According to an embodiment, the processor 216 may receive the identifier of the wireless power receiver 130 at least once during the threshold time. The processor 216 compares the received identifier with the identifier of at least one personal mobile device 140 pre-stored in the storage unit 214 to determine whether the personal mobile device 140 corresponding to the received identifier is valid. , or whether it is invalid.

According to an embodiment, when it is determined that the personal mobile device 140 corresponding to the received identifier is valid, the processor 216 transmits wireless power to the wireless power receiver 130 for a threshold time (eg, 1 second). may temporarily delay the transmission of Alternatively, if it is determined that the personal mobile device 140 corresponding to the received identifier is valid, the processor 216 delays the start of wireless power transmission to the wireless power receiver 130 for a threshold time (eg, 1 second). can

According to an embodiment, when the threshold time elapses, the processor 216 may start supplying wireless power to the wireless power receiver 130 through the power transmitter 212 . The processor 216 periodically checks whether the power unit 422 (eg, the battery 522 ) of the wireless power receiver 130 is fully charged while wireless power is being supplied to the wireless power receiver 130 . can be identified. The processor 216 may receive information on the charging status from the wireless power receiver 130 . Alternatively, the processor 216 may determine the charging status of the power supply unit 422 (eg, the battery 522 ) of the wireless power receiver 130 based on the amount of power supplied through the power transmission unit 212 . there is.

According to an embodiment, the wireless power receiver 130 includes a power supply unit 221 , a power receiver 222 , a communication unit 223 , a storage unit 224 , an output unit 225 , and a processor 226 . can do.

According to an embodiment, the power supply unit 221 may store the wireless power supplied from the wireless power transmitter 110 in the power supply unit 221 (eg, a battery). The power supply unit 221 may store the DC voltage converted by the power reception unit 222 in the battery 522 under the control of the processor 226 .

According to an embodiment, the power receiver 222 may receive the wireless power requested by the wireless power transmitter 110 from the wireless power transmitter 110 . The power receiver 222 may wirelessly receive AC waveform power from the power transmitter 212 of the wireless power transmitter 110 . The power receiver 222 may wirelessly receive power converted into an AC waveform through an inverter included in the power transmitter 212 through a receiving coil included in the power receiver 222 . The power receiver 222 may include various components capable of receiving AC waveform power.

According to an embodiment, the power transmitter 212 includes a rectifier that converts the received AC wireless power into DC and a converter that converts the received AC wireless power to DC by adjusting the deviation of the converted DC power to match the condition of the power supply unit 221 ( e.g. DC/DC converter). In addition, the power transmitter 212 may further include an impedance converter that modulates a communication signal to be transmitted from the power transmitter 212 to the power transmitter 212 of the wireless power transmitter 110 .

According to an embodiment, the communication unit 223 may communicate with the communication unit 213 of the wireless power transmission apparatus 110 in a predetermined manner. The communication unit 223 may transmit power information on the wireless power receiver 130 to the wireless power transmitter 130 . The power information may include at least one of output voltage information, charging current information, and an identifier of the wireless power receiving device 101 .

According to an embodiment, the power information includes information such as a control signal for wireless charging control, a charging frequency of a receiving coil included in the power receiver 222 , information on charging conditions, and measurement values for voltage and transmitted power. may include.

According to an embodiment, the wireless power receiver 130 may adjust the power supplied from the wireless power transmitter 110 through the power information.

According to an embodiment, the communication unit 223 may transmit a charging function control signal for controlling the charging function of the wireless power receiving apparatus 130 to the wireless power transmitting apparatus 110 . The communication unit 223 may communicate with the wireless power transmitter 110 through a frequency different from the frequency of the wireless power signal.

According to an embodiment, the storage unit 224 may include a volatile and/or non-volatile memory. The storage unit 224 may store, for example, a command or data related to at least one other component of the wireless power receiving apparatus 130 . The storage unit 224 may store at least some of commands, algorithms, software, and programs necessary for receiving wireless power from the wireless power transmission device 130 .

According to an embodiment, the storage unit 224 may store various pieces of information to be transmitted to the wireless power transmitter 110 .

According to one embodiment, the display 225 is, for example, a liquid crystal display (LCD), a light-emitting diode (LED) display, an organic light-emitting diode ( OLED) displays, or microelectromechanical systems (MEMS) displays, or electronic paper displays. The display 225 may display, for example, various types of content (eg, text, image, video, icon, or symbol) to the user. The display 225 may include a touch screen capable of detecting a touch input, and may receive, for example, a touch input using a part of the user's body, a gesture, a proximity, or a hovering input.

According to an embodiment, the display 225 is attached to a part of the wireless power receiving device 130, and various information about the charging status (eg, charging, charging rate, charging completion or not, charging time, charging completion expected) time, etc.) can be displayed. Alternatively, the display 225 may be disposed on one side (eg, a center portion of the steering wheel) of the personal mobile device 140 to be easily viewed by a user (or a driver).

According to an embodiment, the processor 226 may control overall operation of the wireless power receiver 130 . The processor 226 may control the overall operation of the wireless power receiver 130 using an algorithm, program, or application required for control read from the storage 224 (eg, memory). The processor 226 may be implemented in the form of a CPU, a microprocessor, or a mini computer.

According to an embodiment, the processor 226 executes an operation or data processing related to control and communication of at least one other component of the wireless power receiving device 130 and/or a wireless charging reception mode through a reception coil or can be controlled The processor 226 may control a power reception mode for receiving power from the wireless power transmission device 110 . In addition, when the power receiver 222 includes a plurality of receiving coils, the processor 226 selects a receiving coil corresponding to the wireless power transmitter 110 from among the plurality of receiving coils, and selects the selected receiving coil. Through this, wireless power may be received from the wireless power transmitter 110 .

According to an embodiment, the processor 226 may transmit a signal to the wireless power transmitter 130 through the communication unit 223 . Also, the processor 226 may display an expected time until charging is completed through the display 225 . The processor 226 may display information indicating a matching or mismatching state between the docking device 120 and the personal mobile device 140 through the display 225 .

According to an embodiment, the processor 226 identifies whether the power transmitter 212 of the wireless power transmitter 110 is activated, and based on the activation of the power transmitter 212 , the wireless power transmitter 110 . can start communication with The processor 226 may generate a high/low signal, and determine whether the resonance frequency of the reception coil of the power receiver 222 is changed through the generated high/low signal. For example, when the resonance frequency of the receiving coil of the power receiving unit 222 is changed through the generated high/low signal, the current of the transmitting coil of the power transmitting unit 212 of the wireless power transmitting device 110 is also changed. can At least one of the wireless power transmitter 110 and the wireless power receiver 130 may perform communication through this change in current.

According to an embodiment, the processor 226 may identify whether the communication time with the wireless power transmitter 110 exceeds a threshold time (eg, 1 second). In addition, when the communication time exceeds the threshold time, the processor 226 activates the converter of the power receiver 222 and transmits it from the wireless power transmitter 110 based on the activation of the converter The used wireless power may be charged to the power supply unit 221 .

According to an embodiment, when the communication time does not exceed the threshold time (eg, 1 second), the processor 226 modulates information including the identifier of the wireless power receiver 130 to obtain a power receiver. It can be transmitted to the wireless power transmitter 110 through 222 (or the communication unit 223 ). The processor 226 may transmit the modulated information to the wireless power transmitter 110 at least once during the threshold time.

According to an embodiment, the processor 226 may periodically or aperiodically identify whether charging of the wireless power in the power supply unit 221 (eg, the battery 522 ) is completed. When it is identified that charging of the wireless power is completed, the processor 226 may deactivate the converter.

According to an embodiment, when it is identified that charging of the wireless power is completed, the processor 226 may transmit information indicating that charging is complete to the wireless power transmitter 110 . The processor 226 may display information indicating that charging is complete through the display 225 . The display 225 may be disposed on one side of the handle of the personal mobile device 140 .

3 is a schematic block diagram of an apparatus for transmitting power wirelessly according to an embodiment of the present invention. 4 is a detailed block diagram of an apparatus for transmitting power wirelessly according to an embodiment of the present invention.

Some components in FIGS. 3 and 4 may perform the same or similar functions as some components of FIG. 2 , and may be omitted for convenience of description.

3 and 4 , the wireless power transmitter 110 according to an embodiment of the present invention includes a plug 318 and an auxiliary power supply unit 321 that can be connected to a terminal of the grid to receive power from the grid. may include

According to an embodiment, the auxiliary power supply unit 321 drops the voltage (eg, AC 220V) applied from the system to a constant voltage (eg, 12V), and converts the lowered voltage (eg, 12V) back to a constant voltage ( Example: 3.3V) can be applied to the processor 216 by lowering it again.

According to an embodiment, the auxiliary power unit 321 includes a first voltage converter 411 for dropping a voltage (eg, AC 220V) applied from the system to a constant voltage (eg, 12V), the lowered voltage (eg, : 12V) back to a constant voltage (eg, 3.3V) a second voltage converter 412, and a third that converts the lowered voltage (eg, 12V) back to a constant voltage (eg, 15V) A voltage converter 413 may be included.

According to an embodiment, the auxiliary power unit 321 converts the voltage of the power supplied from the plug 318 to a constant voltage suitable for the operation of each element of the wireless power transmitter 110 (eg, 5V or 3.3V). After dropping to , it can be supplied to each element.

According to an embodiment, the power transmitter 212 includes a filter unit 311 , a power factor improving unit 312 , an inverter 313 , a coil unit 314 , a current measuring unit 316 , and a resonator 318 . may include

According to an embodiment, the filter unit 311 (eg, a linear filter) can reduce electromagnetic interference (EMI) based on power supplied from the power supply unit 211 through the plug 318 ( or can be eliminated), and may include a choke coil and a capacitor. The filter unit 311 (eg, a line filter, or an EMI filter) may remove noise from a system power supply in order to remove electrical noise and supply normal power to the wireless power transmitter 110 .

According to an embodiment, the filter unit 311 eliminates electromagnetic interference from the first AC voltage (eg, AC 110V to AC 220V) supplied through the plug 318 , and then the power factor improving unit 312 . can be provided as A diode (not shown) may be disposed between the filter unit 311 and the power factor improving unit 312 .

According to an embodiment, the power factor improving unit 312 converts a first AC voltage (eg, AC 110V to AC 220V) having a first frequency (eg, 60Hz) applied from the filter unit 311 to a first DC voltage. The power factor can be adjusted by converting it to a voltage (eg DC 400V). The power factor means the cosine difference of the phase time in the flow formed by the waveforms of the voltage and current of the AC power source. That is, the power factor refers to the shape and rate of change of the voltage graph and the current graph by combining them. The power factor improving unit 312 may supply the first DC voltage (eg, DC 400V) of which the power factor is adjusted to the inverter 313 .

According to an embodiment, at least one of the filter unit 311 and the power factor improver 312 may or may not be selectively included in the wireless power transmitter 110 .

According to an embodiment, the coil unit 314 may include a transmitting coil 315 . The transmitting coil 315 may be formed of a single wire having a spiral shape, or may include a plurality of coils having a spiral shape. The coil unit 314 may convert the first DC voltage (eg, DC 400V) back to an AC voltage. The coil unit 314 may include a transmitting coil 315 and a capacitor 317 . The transmitting coil 315 may include a resonance coil. The transmitting coil 315 may supply the converted AC voltage to the wireless power receiving device 130 .

According to an embodiment, the coil unit 314 may transmit the input AC power to the receiving coil 512 of the wireless power receiving apparatus 130 . The transmitting coil 315 and the receiving coil 512 may be implemented as a resonant circuit having the same frequency. For example, the resonant frequency may be determined to be 110-205 KHz. One side of the transmitting coil 315 may be connected to a current measuring unit 316 and an oscillator (not shown). The current measuring unit 316 may include at least one sensor (not shown) for measuring a current change and an inductance change of the transmitting coil 315 .

According to an embodiment, the processor 216 may detect whether the wireless power receiver 130 is attached or detached through the interaction between the inverter 313 and the resonator 318 .

According to an embodiment, the processor 216 may detect whether the wireless power receiver 130 is attached or detached by analyzing a frequency according to the output voltage of the resonator 318 .

According to an embodiment, the processor 216 may determine that the wireless power receiver 130 is mounted in the docking device 120 based on the measurement of the current change and the inductance change. In addition, the current measuring unit 316 may receive (or recognize) the in-band communication signal generated from the wireless power receiving device 130 through the change in the current of the transmitting coil 315, and the recognition result of the processor (216) can be provided.

According to an embodiment, the output unit 215 may include at least one LED 421 , a speaker 422 , and a power meter 423 . A voltage (eg, 12V) lowered by the auxiliary power unit 321 may be applied to the at least one LED 421 . In addition, a voltage (eg, 5V) lowered by the auxiliary power unit 321 may be applied to the speaker 422 . In addition, the power meter 423 may be connected to the processor 216 through RS485. Each of the at least one LED 421 may emit light through at least one of red, green, and blue for various information about the state of charge.

According to an embodiment, the communication unit 213 may include an RS485 input terminal 424 and an RS485 output terminal 425 . The communication unit 213 may be connected to the processor 216 through RS485.

According to an embodiment, the processor 216 of FIG. 4 may perform at least one operation or function performed by the processor 216 of FIG. 2 .

5 is a block diagram of a power transmitter of a wireless power transmitter according to an embodiment of the present invention. 6 is a block diagram of a power transmitter of a wireless power transmitter according to another embodiment of the present invention.

5 and 6 , the power transmitter 212 of the wireless power transmitter 110 according to an embodiment of the present invention may include an inverter 313 , a transmitting coil 315 , and a resonator 318 . can

According to an embodiment, the power transmitter 212 of the wireless power transmitter 110 may operate in a mode (eg, a detection mode) capable of detecting attachment (or approach) of the wireless power receiver 130 . . In a mode (eg, wireless power transmission mode) in which the wireless power transmission device 110 is transmitting power (eg, 100W or more) of a certain intensity to the wireless power reception device 130 , It does not operate in a mode that can detect attachment (or approach) (eg detection mode).

According to an embodiment, since the power transmitter 212 of the wireless power transmitter 110 uses a standby power source, that is, a low voltage (eg, 5V or 3.3V), the switch 525 in the power transfer mode is turned OFF to protect the resonator 318 .

According to an embodiment, when the wireless power transmitter 110 transmits power wirelessly, the wireless power transmitter 110 activates the third switch 525 through an overdriver_enable signal (OD_EN signal). turn OFF. In addition, when the wireless power transmission device 110 drives the inverter 313 to transmit wireless power to the wireless power reception device 130 through the transmission coil 315 , a high voltage is applied to the first capacitor 521 . Since it is applied, the voltage detection sensor 522 may be operated to turn off the third switch 525 .

According to an embodiment, the inverter 313 may include at least two switches 511 and 512 . In order for the wireless power transmitter 110 to detect the attachment/detachment of the wireless power receiver 130 , the wireless power transmitter 110 may deactivate the operation of the inverter. In addition, the wireless power transmission device 110 operates the second switch 512 connecting the transmission coil 315 and the ground to be ON, and to prevent the voltage (eg, 400V) based on the wireless power transmission from being supplied. 1 The switch 511 can be turned OFF.

According to an embodiment, when the first switch 511 is turned off and the second switch 512 is turned on simultaneously, an overcurrent may be generated in the transmitting coil 315 . To prevent this, the wireless power transmission device 110 (eg, the processor 216 ) may gradually turn off the first switch 511 and gradually turn on the second switch 512 .

According to an embodiment, the wireless power transmission device 110 (eg, the processor 216 ) gradually turns off the first switch 511 and gradually turns on the second switch 512 , the first capacitor It can be periodically checked whether the voltage of 521 (eg, the current voltage) becomes smaller than the voltage of the low-power circuit (eg, 3.3V or less, or 5V or less).

According to an embodiment, when the voltage (eg, the current voltage) of the first capacitor 521 becomes smaller than the voltage (eg, 3.3V or less, or 5V or less) of the low-power circuit, the wireless power transmitter 110 ( Example: The processor 216 may apply an overdriver_enable signal (OD_EN signal) to the third switch 525 to turn on the third switch 525 .

According to an embodiment, after the third switch 525 is turned ON, the wireless power transmitter 110 (eg, the processor 216 ) may identify whether the resonator 318 is operating.

According to an embodiment, the wireless power transmitter 110 (eg, the processor 216 ) may apply a voltage having a first voltage waveform 526 to the second capacitor 528 . The second capacitor 528 is connected to the negative input terminal of the op amp 534 in the resonator 318 . When the voltage having the first voltage waveform 526 is applied to the second capacitor 528, a signal having the second voltage waveform 527 is output from the second capacitor 528, and the output signal is It may be provided as a negative (-) input terminal of the op amp 534 in the resonator 318 .

According to an embodiment, the wireless power transmitter 110 (eg, the processor 216 ) has a second voltage waveform 527 supplied to the negative input terminal of the op amp 534 of the resonator 318 . The frequency of the output voltage 535 may be measured based on . The frequency decreases as the distance from the wireless power receiver 130 increases, and increases as the distance from the wireless power receiver 130 increases.

According to an embodiment, the wireless power transmission device 110 (eg, the processor 216 ) measures the frequency of the output voltage 535 of the resonator 318 , and the inductance of the transmission coil through the measured frequency can be calculated. When the calculated inductance is greater than a reference value, the wireless power transmitter 110 (eg, the processor 216 ) may determine that the wireless power receiver 130 is mounted (or adjacent). For example, when the calculated inductance is not greater than a reference value, the wireless power transmitter 110 (eg, the processor 216 ) determines that the wireless power receiver 130 is not mounted (or adjacent). can judge The reference value is a value capable of determining whether the wireless power receiver 130 is mounted (or exists).

According to an embodiment, when it is determined that the wireless power receiver 130 is mounted, the wireless power transmitter 110 (eg, the processor 216 ) performs pairing with the wireless power receiver 130 . can do. Through the pairing, the wireless power transmitter 110 may obtain the identifier of the wireless power receiver 130 , and determine whether the wireless power receiver 130 is valid based on the obtained identifier.

According to an embodiment, the resonator 318 included in the power transmitter 212 of the wireless power transmitter 110 may include at least one op amp 534 . The operational amplifier 534 may receive the voltage of the second waveform 527 from the second capacitor 528 through a (-) input terminal, and may output Vosc.

According to one embodiment, a first resistor (R ₁ ) is connected between the output terminal and the (+) input terminal of the operational amplifier 534, and a third resistor (R ₃ ) is connected between the (-) input terminal and the ground. is connected, and a second resistor R ₂ is connected between the (-) input terminal and the output terminal.

According to an embodiment, a voltage (eg, a high voltage) output through the output terminal of the operational amplifier 534 may be applied to the transmitting coil 315 through the first resistor R ₁ . Thereafter, the (-) input terminal and the (+) input terminal of the op amp 534 are switched, and the voltage (eg, low voltage) fed back by the transmitting coil 315 is again the voltage of the op amp 534 . It can be input through the (-) input terminal.

According to an embodiment, a first resistor (R ₁ ) and a third capacitor 614 are connected in series between the output terminal and the (+) input terminal of the operational amplifier 534, and the (-) input terminal and the ground A third resistor R ₃₂ is connected therebetween, and a second resistor R ₂ is connected between the (-) input terminal and the output terminal. A fourth resistor R ₄₂ is connected in series between the (+) input terminal of the operational amplifier 534 and the third switch 525 , and a fifth resistor R ₄₁ and a sixth resistor R ₃₁ ) are respectively connected in parallel to the fourth resistor (R ₄₂ ).

According to an embodiment, when the output voltage V ₃ of the operational amplifier 534 is V _DD , the third capacitor 614 is charged with the voltage V _DD /2. And, when the third capacitor 614 is grounded, a voltage opposite to the voltage of the third capacitor 614 becomes -V _DD /2 voltage.

7 is an exemplary diagram illustrating a waveform of a voltage output from a resonator according to an embodiment of the present invention.

Referring to FIG. 7 , the waveform 710 of the voltage Vosc output from the resonator 318 according to an embodiment of the present invention has a high voltage (eg, +5V) and a low voltage (eg -5V). it is a square wave

According to an embodiment, the waveform 710 of the voltage Vosc output from the resonator 318 in FIG. 5 is a square wave having a high voltage (eg, +5V) and a low voltage (eg -5V), and FIG. The waveform 710 of the voltage Vosc output from the resonator 318 at step 5 may have a rectangular shape having a high voltage (eg, +2.5V) and a low voltage (eg -2.5V). In addition, the waveform 710 of the voltage Vosc output from the resonator 318 has a predetermined period (eg, T).

According to an embodiment, the wireless power transmission apparatus 110 (eg, the processor 216 ) may measure the inductance of the transmission coil 315 through Equation 1 below. The wireless power transmission device 110 (eg, the processor 216 ) calculates the inductance of the transmission coil 315 through Equation 1 below to determine whether the wireless power reception device 130 exists. there is.

In [Equation 1], f is the frequency of the output voltage of the resonator 318, T is the period of the output voltage, L _TX is the inductance of the transmission coil 315, C _R is the value of the first capacitor 521 indicates

8 is a block diagram of an apparatus for transmitting power wirelessly and an apparatus for receiving power wirelessly according to an embodiment of the present invention.

Referring to FIG. 8 , each component of the wireless power transmitter 110 may be disposed on a PCB 811 . In addition, a magnetic material 812 (eg, ferrite) may be disposed on the upper surface of the PCB. The PCB 811 and the magnetic body 812 may be spaced apart from each other by a predetermined interval. In addition, a transmitting coil 315 may be disposed on the upper surface of the magnetic material.

According to an embodiment, the transmitting coil 315 may be disposed at a predetermined interval (eg, 0.5 mm) from the housing 813 of the wireless power transmitting apparatus 110 . Also, the thickness of the housing 813 may be about 3.0 mm.

According to an embodiment, each component of the wireless power receiver 130 may be disposed on the PCB 821 . In addition, a magnetic material 822 (eg, ferrite) may be disposed on the upper surface of the PCB. The PCB 821 and the magnetic body 822 may be spaced apart from each other by a predetermined interval. In addition, a receiving coil 824 may be disposed on the upper surface of the magnetic body.

According to an embodiment, the receiving coil 824 may be disposed at a predetermined interval (eg, 0.5 mm) from the housing 823 of the wireless power receiving device 130 . Also, the thickness of the housing 823 may be about 3.0 mm.

According to an embodiment, a distance between the housing 813 of the wireless power transmitter 110 and the housing 823 of the wireless power receiver 130 may be within a predetermined distance (eg, 3 mm).

According to an embodiment, the interval between the transmitting coil 315 of the wireless power transmitting device 110 and the receiving coil 824 of the wireless power receiving device 130 may be a predetermined distance (eg, 7 to 10 mm). .

According to one embodiment, the PCB 811 of the wireless power transmission device 110 is a SM (Stand Alone) mode that operates basic without RS485 communication, and an SM capable of operation control through RS485 communication in a control system (not shown). (Slave Mode) may include a switch (not shown) that can provide all switching between.

According to an embodiment, the PCB 821 of the wireless power receiver 130 may include a terminal for supplying charged power to a motor (not shown) so that the personal mobile device 140 can move.

According to an embodiment, the cross-sectional area of the transmitting coil 315 of the wireless power transmitting device 110 may be 100mmX100mm, and the receiving coil 724 of the wireless power receiving device 130 may have a cross-sectional area of 100mmX80mm. In addition, the size of the magnetic body 812 of the wireless power transmitter 110 may be 120mmX150mm, and the size of the magnetic body 822 of the wireless power receiver 130 may be 120mmX180mm. It is obvious that the present invention can be applied to a transmitting coil, a receiving coil, and a magnetic body of various areas other than the above-mentioned size.

According to an embodiment, through this arrangement structure of the wireless power transmitter 110 and the wireless power receiver 130, heat dissipation efficiency can be improved, and the charging efficiency due to the temperature rise and the external surface temperature rise problems can be solved.

9 is a flowchart illustrating a process in which a wireless power transmitter determines whether a wireless power receiver is present according to an embodiment of the present invention.

Hereinafter, with reference to FIG. 9 , a process in which the wireless power transmitter according to an embodiment of the present invention determines the presence or absence of the wireless power receiver will be described in detail as follows.

According to an embodiment, the wireless power transmitter 110 (eg, the processor 216 ) may control the first switch of the inverter to be OFF and the second switch to be turned ON ( S910 ). The wireless power transmission device 110 (eg, the processor 216 ) operates the first switch 511 in the inverter 313 to be OFF, and operates the second switch 512 to be ON, so that the transmission coil It is possible to block transmission of wireless power corresponding to a predetermined voltage (eg, 400V) to 315 . The wireless power transmission device 110 (eg, the processor 216 ) gradually decreases the time the first switch 511 is operated to be ON, and is in inverse proportion to the time the first switch 511 is operated to be ON. As much as possible, the time during which the second switch 512 is turned OFF may be gradually increased.

According to an embodiment, the wireless power transmitter 110 (eg, the processor 216 ) may compare the first capacitor voltage and the first threshold voltage ( S912 ). The wireless power transmission device 110 (eg, the processor 216 ) gradually decreases the time the first switch 511 is operated to be ON, and is in inverse proportion to the time the first switch 511 is operated to be ON. As much as possible, the voltage of the first capacitor 521 may be checked while gradually increasing the time for which the second switch 512 is turned OFF. The wireless power transmitter 110 (eg, the processor 216 ) may periodically check whether the voltage of the first capacitor 521 is less than or equal to a first threshold voltage (eg, 3.3V or 5V). .

According to an embodiment, the wireless power transmitter 110 (eg, the processor 216) may control the third switch to be ON (S914). When it is determined that the voltage of the first capacitor 521 is less than or equal to a first threshold voltage (eg, 3.3V or 5V), the wireless power transmission device 110 (eg, the processor 216 ) determines the transmission coil The third switch 525 disposed between the 315 and the resonator 318 may be turned ON. The wireless power transmission device 110 (eg, the processor 216 ) operates the third switch 525 disposed between the transmission coil 315 and the resonator 318 to be ON, and the wireless power reception device ( 130) may be executed.

According to an embodiment, the wireless power transmitter 110 (eg, the processor 216 ) may apply a voltage to the second capacitor ( S916 ). The wireless power transmitter 110 (eg, the processor 216 ) may apply a voltage based on a first voltage waveform 526 (eg, a square wave) to the second capacitor 528 . The wireless power transmitter 110 (eg, the processor 216 ) may apply a voltage corresponding to noise to the second capacitor 528 .

According to an embodiment, the second capacitor 528 is connected to the (-) input terminal of the op amp 534 in the resonator 318 . When the voltage having the first voltage waveform 526 is applied to the second capacitor 528, a signal (or pulse) having the second voltage waveform 527 is output from the second capacitor 528, and the The output signal (or pulse) may be provided to the (-) input terminal of the operational amplifier 534 in the resonator 318 .

According to an embodiment, the wireless power transmitter 110 (eg, the processor 216 ) may acquire the frequency of the output voltage of the resonator ( S918 ). The wireless power transmission device 110 (eg, the processor 216 ) is a signal (or pulse) having a second voltage waveform 527 provided to the negative input terminal of the operational amplifier 534 of the resonator 318 . The frequency of the output voltage 535 (eg, Vosc) may be measured based on the . The frequency decreases as the distance from the wireless power receiver 130 increases, and increases as the distance from the wireless power receiver 130 increases. The magnitude of the frequency may be proportional to the distance to the wireless power receiver 130 .

According to an embodiment, the wireless power transmission apparatus 110 (eg, the processor 216 ) may acquire the inductance of the transmission coil through the obtained frequency ( S920 ). The wireless power transmission device 110 (eg, the processor 216 ) obtains the frequency of the output voltage 535 of the resonator 318 , and calculates (or measures) the inductance of the transmission coil through the obtained frequency. can do. The wireless power transmitter 110 (eg, the processor 216 ) may compare the calculated inductance with the size of a reference value.

According to an embodiment, when the calculated inductance is greater than a reference value, the wireless power transmitter 110 (eg, the processor 216 ) determines that the wireless power receiver 130 is mounted (or adjacent). can judge For example, when the calculated inductance is not greater than a reference value, the wireless power transmitter 110 (eg, the processor 216 ) determines that the wireless power receiver 130 is not mounted (or adjacent). can judge The reference value is a value capable of determining whether the wireless power receiver 130 is mounted (or exists).

According to an embodiment, the wireless power transmitter 110 (eg, the processor 216 ) may determine the presence or absence of the wireless power receiver through the obtained inductance ( S922 ). When it is determined that the wireless power receiver 130 is mounted, the wireless power transmitter 110 (eg, the processor 216 ) may perform pairing with the wireless power receiver 130 . The wireless power transmitter 110 (eg, the processor 216 ) acquires the identifier of the wireless power receiver 130 through the pairing, and the wireless power receiver 130 through the obtained identifier Whether or not it is valid (or authentication) can be determined.

Each step in each of the above-described flowcharts may be operated regardless of the illustrated order, or may be performed simultaneously. In addition, at least one component of the present invention and at least one operation performed by the at least one component may be implemented in hardware and/or software.

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in this specification, and various methods can be obtained by those skilled in the art within the scope of the technical spirit of the present invention. It is obvious that variations can be made. In addition, although the effects according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the configuration should also be recognized.

110: wireless power transmission device 120: docking device
130: wireless power receiving device 140: personal mobile device
211: power supply 212: power transmitter
213: communication unit 214: storage unit
215: output 216: processor
221: power unit 222: power receiving unit
223: communication unit 224: storage unit
225: display 226: processor
311: filter unit 312: power factor improving unit
313: inverter 314: coil unit
316: current measuring unit 318: resonator

Claims (18)

A wireless power transmission device comprising:
resonator; and
a processor electrically connected to the resonator;
The processor is
Based on the pulse input to the first terminal of the amplifier included in the resonator, to obtain the frequency of the voltage output from the resonator,
Calculate the inductance of the transmitting coil for transmitting wireless power based on the obtained frequency,
A wireless power transmitter configured to determine whether there is a wireless power receiver receiving the wireless power based on the calculated inductance.
According to claim 1,
Including an inverter for transmitting wireless power to the transmission coil,
The processor is
A wireless power transmission device configured to operate a first switch in the inverter to be OFF and to operate a second switch to be ON to cut off the wireless power transmitted to the transmission coil.
3. The method of claim 2,
The processor is
So that the voltage of the first capacitor connected between one end of the transmitting coil and the ground becomes less than or equal to a predetermined voltage, the time for which the first switch is operated to be ON is reduced, and to be in inverse proportion to the time when the first switch is operated to be ON. A wireless power transmission device set to increase the time during which the second switch is turned OFF.
4. The method of claim 3,
When the voltage of the first capacitor is equal to or less than the predetermined voltage,
The processor is
A wireless power transmission device configured to turn on a third switch disposed between the transmission coil and the resonator.
According to claim 1,
The processor is
applying a square wave voltage to the second capacitor connected to the first terminal,
Based on the voltage of the square wave applied to the second capacitor, the wireless power transmitter is configured to input a pulse output from the second capacitor to the first terminal of the amplifier.
According to claim 1,
The processor is
A wireless power transmitter set to calculate the inductance of the transmitting coil by using the obtained frequency and the voltage of the first capacitor connected between one end of the transmitting coil and the ground.
According to claim 1,
The processor is
The wireless power transmitter is configured to determine that the wireless power receiver is adjacent to the wireless power transmitter when the calculated inductance is greater than a predetermined value.
According to claim 1,
It further includes a communication unit,
The processor is
A wireless power transmitter configured to perform pairing with the wireless power receiver through the communication unit when it is determined that the wireless power receiver exists.
9. The method of claim 8,
The processor is
receiving an identifier of the wireless power receiving device based on pairing with the wireless power receiving device;
A wireless power transmitter configured to determine whether the wireless power receiver is valid based on the received identifier.
A method for a wireless power transmission device, comprising:
obtaining a frequency of a voltage output from the resonator based on a pulse input to a first terminal of an amplifier included in the resonator of the wireless power transmitter;
calculating an inductance of a transmitting coil for transmitting wireless power based on the obtained frequency; and
and determining whether there is a wireless power receiving device receiving the wireless power based on the calculated inductance.
11. The method of claim 10,
The method further comprising the step of operating a first switch in the inverter to be OFF, and to operate a second switch to be ON to cut off the wireless power transmitted to the transmitting coil.
12. The method of claim 11,
reducing the time during which the first switch is turned ON so that the voltage of the first capacitor connected between one end of the transmitting coil and the ground becomes less than or equal to a predetermined voltage; and
The method further comprising the step of increasing the time during which the second switch is operated to be OFF so that it is in inverse proportion to the time when the first switch is operated to be ON.
13. The method of claim 12,
The method further comprising the step of operating a third switch disposed between the transmitting coil and the resonator to be turned ON when the voltage of the first capacitor is equal to or less than the predetermined voltage.
11. The method of claim 10,
applying a square wave voltage to a second capacitor connected to the first terminal; and
The method further comprising the step of inputting a pulse output from the second capacitor to the first terminal of the amplifier based on the voltage of the square wave applied to the second capacitor.
11. The method of claim 10,
The method further comprising the step of calculating the inductance of the transmitting coil using the obtained frequency and the voltage of a first capacitor connected between one end of the transmitting coil and a ground.
11. The method of claim 10,
The method further comprising the step of determining that the wireless power receiver is adjacent to the wireless power transmitter when the calculated inductance is greater than a predetermined value.
11. The method of claim 10,
The method further comprising the step of performing pairing with the wireless power receiver when it is determined that the wireless power receiver exists.
18. The method of claim 17,
receiving an identifier of the wireless power receiver based on pairing with the wireless power receiver; and
The method further comprising the step of determining whether the wireless power receiver is valid based on the received identifier.

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