WO2018221964A1

WO2018221964A1 - Wireless charging method

Info

Publication number: WO2018221964A1
Application number: PCT/KR2018/006171
Authority: WO
Inventors: 채용석; 이종헌
Original assignee: 엘지이노텍 주식회사
Priority date: 2017-05-30
Filing date: 2018-05-30
Publication date: 2018-12-06
Also published as: KR20180130774A

Abstract

A wireless charging method: executes any one charging mode between a first charging mode and a second charging mode; confirms an undetection of a smart key in a vehicle; changes the charging mode in operation to a fine power transmission mode; and performs the charging in the fine power transmission mode. The wireless charging method allows return to the previously executed charging mode when a smart key detection signal is received during the fine power transmission mode.

Description

Wireless charging method

The present embodiment relates to a wireless power transmission technology, and more particularly to a wireless charging method.

Portable terminals such as mobile phones and laptops include a battery that stores power and circuits for charging and discharging the battery. In order for the battery of the terminal to be charged, power must be supplied from an external charger.

In general, as an example of an electrical connection method between a charging device and a battery for charging power to a battery, the terminal is supplied with commercial power and converted into a voltage and a current corresponding to the battery to supply electrical energy to the battery through the terminal of the battery. Supply method. This terminal supply method is accompanied by the use of a physical cable (cable) or wire. Therefore, when handling a lot of terminal supply equipment, many cables occupy considerable working space, are difficult to organize, and are not good in appearance. In addition, the terminal supply method may cause problems such as instantaneous discharge phenomenon due to different potential difference between the terminals, burnout and fire caused by foreign substances, natural discharge, deterioration of battery life and performance.

Recently, in order to solve this problem, a charging system (hereinafter referred to as a "wireless charging system") and a control method using a method of transmitting power wirelessly have been proposed. In addition, since the wireless charging system was not pre-installed in some portable terminals in the past and the consumer had to separately purchase a wireless charging receiver accessory, the demand for the wireless charging system was low, but the number of wireless charging users is expected to increase rapidly. It is expected to be equipped with wireless charging function.

In general, the wireless charging system includes a wireless power transmitter for supplying electrical energy through a wireless power transmission method and a wireless power receiver for charging the battery by receiving the electrical energy supplied from the wireless power transmitter.

The wireless charging system may transmit power by at least one wireless power transmission method (eg, electromagnetic induction method, electromagnetic resonance method, RF wireless power transmission method, etc.).

For example, the wireless power transmission scheme may use various wireless power transmission standards based on an electromagnetic induction scheme that generates a magnetic field in the power transmitter coil and charges using an electromagnetic induction principle in which electricity is induced in the receiver coil under the influence of the magnetic field. . Here, the electromagnetic induction wireless power transmission standard may include an electromagnetic induction wireless charging technology defined by the Wireless Power Consortium (WPC) and Air Fuel Alliance (formerly PMA, Power Matters Alliance).

As another example, the wireless power transmission method may use an electromagnetic resonance method of transmitting power to a wireless power receiver located in close proximity by tuning a magnetic field generated by a transmission coil of the wireless power transmitter to a specific resonance frequency. . Here, the electromagnetic resonance method may include a wireless charging technology of the resonance method defined in the Air Fuel Alliance (formerly A4WP, Alliance for Wireless Power) standard mechanism which is a wireless charging technology standard mechanism.

Meanwhile, a wireless charging function is installed in various devices, and a wireless charging device in a vehicle is included for a user's wireless charging convenience. The wireless charging device in the vehicle may easily perform wireless charging of the electronic device when the electronic device including the wireless charging receiver is detected adjacent to the wireless charging device even while moving in the vehicle.

Recently, with the development of wireless communication technology, the user can greatly improve user convenience by applying the turnkey method applied to a conventional vehicle as a smart key method using short-range communication. However, the smart key is a short-range communication system and communicates with the vehicle in a frequency band similar to that used for wireless charging. Therefore, the frequency interference with the smart key may occur when the wireless charging. In addition, when the smart key is mounted on the wireless charging device in the vehicle, the wireless charging device may detect the smart key as a receiver or a problem that the smart key is not retrieved in the vehicle.

In this case, the wireless charging device may ignore the mounting of the smart key and execute the power transmission step. In particular, when the power transfer step is executed by fast charging, the smart key may have an internal configuration damaged by the rapid power supply, which may cause an unusable situation.

The present embodiment is devised to solve the above-mentioned problems of the related art, and an object of the present embodiment is to provide a wireless charging method.

Still another object according to the present embodiment is to provide a wireless charging method capable of controlling the charging power of the wireless power transmitter.

In addition, another object according to the present embodiment is to provide a wireless charging method for improving the charging efficiency reduction by the foreign matter during wireless charging.

In addition, another object according to the present embodiment is to provide a wireless charging method that can maximize the charging efficiency of the wireless power receiver while minimizing interference by the smart key in the vehicle.

In addition, another object according to the present embodiment is to provide a wireless charging method that can minimize the damage that the smart key in the vehicle can be caused by the wireless power transmitter.

The technical problems to be achieved in the present embodiment are not limited to the technical problems mentioned above, and other technical problems not mentioned above are clearly understood by those skilled in the art to which the present embodiment belongs from the following description. Could be.

In order to solve the above technical problem, a wireless charging method comprising: executing any one of the first charging mode or the second charging mode; Checking the smart key not detected in the vehicle; A charging mode changing step of changing the running charging mode into a fine power transmission mode; And charging in the fine power transfer mode; and returning to a charge mode to return to a previously executed charging mode when receiving the smart key sensing signal during the fine power transfer mode.

In addition, the wireless charging method according to the present embodiment includes the steps of checking the smart key not detected in the vehicle; Executing a fine power transfer mode; Receiving a smart key sensing signal during execution of the fine power transfer mode; And a charging mode changing step of changing from the fine power transfer mode to any one of a first charging mode and a second charging mode.

The wireless power transmitter and the wireless charging method using the same according to the present embodiment will be described below.

This embodiment can provide a wireless charging method.

In addition, in the present embodiment, the wireless power transmitter may control the charging power.

In addition, the present embodiment may control the charging power according to the state of the wireless power transmitter.

In addition, the present embodiment can minimize interference with the smart key of the vehicle.

In addition, the present embodiment can perform the wireless charging to minimize the damage that can occur according to the position of the smart key of the vehicle.

In addition, the present embodiment may use the component elements defined in the published wireless power transmission standard, and may follow the standard already defined.

Effects obtained in the present embodiment are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are provided to facilitate understanding of the present invention, and provide embodiments of the present invention together with the detailed description. However, the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.

1 is a block diagram illustrating a wireless charging system according to an exemplary embodiment.

2 is a block diagram illustrating a structure of a wireless power transmitter according to the present embodiment.

3 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to FIG. 4.

4 is a diagram illustrating a packet format according to an embodiment of a first wireless power transmission procedure.

5 is a diagram illustrating a type of a packet that can be transmitted in a ping step by a wireless power receiver according to an embodiment of the first wireless power transmission procedure.

6 illustrates a message format of an identification packet according to an embodiment of a first wireless power transmission procedure.

7 is a diagram illustrating a message format of a configuration packet and a power control suspend packet according to an embodiment of a first wireless power transmission procedure.

FIG. 8 is a diagram illustrating a structure of a charging mode package for requesting a charging mode change according to an embodiment of the first wireless power transmission procedure.

9 is a state diagram of a charging mode for explaining the switching of the charging mode according to an embodiment.

10 is a diagram illustrating a power transmission operation of a wireless power transmitter according to an embodiment.

11 is a view for explaining a smart key search operation in a vehicle according to an embodiment.

12 is a diagram for describing a power transmission operation of a wireless power transmitter according to another embodiment.

Hereinafter, an apparatus and various methods to which the embodiments are applied will be described in more detail with reference to the accompanying drawings. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other.

In the foregoing description, the present invention is not necessarily limited to these embodiments, although all of the components constituting the embodiments are described as being combined or operating in combination. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented in one independent hardware, each or all of the components may be selectively combined to perform some or all functions combined in one or a plurality of hardware. It may be implemented as a computer program having a. Codes and code segments constituting the computer program may be easily inferred by those skilled in the art. Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing the embodiments. The storage medium of the computer program may include a magnetic recording medium, an optical recording medium, a carrier wave medium, and the like.

In the description of the embodiments, in the case of being described as being formed at "up (up) or down (down)", "before (front) or back (back)" of each component, "up (up) or down (Bottom) "and" before (front) or after (back) "both include direct contact with one another or one or more other components disposed between two components.

In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meanings as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".

In the following description of the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured by those skilled in the art with respect to the related well-known technology, the detailed description thereof will be omitted.

In the description of the embodiment, the apparatus for transmitting wireless power on the wireless power charging system is a wireless power transmitter, wireless power transmitter, wireless power transmitter, wireless power transmitter, transmitter, transmitter, transmitter, transmitting side for convenience of description. A wireless power transmitter, a wireless power transmitter, and a wireless charging device will be used in combination. In addition, as a representation of a device for receiving the wireless power from the wireless power transmitter, for convenience of description, a wireless power receiver, a wireless power receiver, a wireless power receiver, a wireless power receiver, a receiver terminal, a receiver, a receiver, a receiver Terminals and the like may be used interchangeably.

Wireless charging apparatus according to the embodiment may be configured in the form of a pad, a cradle, an access point (AP), a small base station, a stand, a ceiling buried, a wall, etc., one transmitter receives a plurality of wireless power It may also transmit power to the device.

For example, the wireless power transmitter may not only be used on a desk or a table, but also may be developed and applied to an automobile and used in a vehicle. The wireless power transmitter installed in the vehicle may be provided in the form of a cradle that can be fixed and mounted simply and stably.

Terminal according to the embodiment is a mobile phone (smart phone), smart phone (smart phone), laptop computer (laptop computer), digital broadcasting terminal, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player), navigation, MP3 player, electric It may be used in small electronic devices such as a toothbrush, an electronic tag, a lighting device, a remote control, a fishing bobber, and the like, but is not limited to this. The term "terminal" is sufficient, and the term "terminal" or "device" may be used interchangeably. The wireless power receiver according to another embodiment may be mounted in a vehicle, an unmanned aerial vehicle, an air drone, or the like.

The wireless power receiver according to the embodiment may be provided with at least one wireless power transmission scheme, and may simultaneously receive wireless power from two or more wireless power transmitters. Here, the wireless power transmission method may include at least one of the electromagnetic induction method, electromagnetic resonance method, RF wireless power transmission method. In particular, the wireless power receiving means supporting the electromagnetic induction method may include electromagnetic induction wireless charging technology defined by the Wireless Power Consortium (WPC) and Air Fuel Alliance (formerly PMA, Power Matters Alliance). Can be. In addition, the wireless power receiving means supporting the electromagnetic resonance method may include a wireless charging technology of the resonance method defined in the Air Fuel Alliance (formerly A4WP, Alliance for Wireless Power) standard mechanism of the wireless charging technology standard mechanism.

In general, the wireless power transmitter and the wireless power receiver constituting the wireless power system may exchange control signals or information through in-band communication or Bluetooth low energy (BLE) communication. Here, in-band communication and BLE communication may be performed by a pulse width modulation method, a frequency modulation method, a phase modulation method, an amplitude modulation method, an amplitude and phase modulation method, or the like. For example, the wireless power receiver may transmit various control signals and information to the wireless power transmitter by generating a feedback signal by switching ON / OFF the current induced through the receiving coil in a predetermined pattern. The information transmitted by the wireless power receiver may include various state information including received power strength information. The wireless power transmitter may calculate the charging efficiency or the power transmission efficiency based on the received power strength information.

Referring to FIG. 1, the wireless charging system according to the present embodiment is mounted in a vehicle 100 and a vehicle 100 in which some operations are driven by a smart key 10, and a wireless power transmitter for transmitting power wirelessly ( 200, the wireless power receiver 300 for receiving the transmitted power, and the electronic device 30 for receiving the received power.

For example, the smart key 10 receives a low frequency (LF) band signal emitted from the communication unit 110 in the vehicle 100, and receives a radio frequency (RF) of an ultra high frequency (UHF) band. Communication may be performed by transmitting a Frequency) signal to the communication unit 110. This is not limited, and the smart key 10 and the vehicle 100 may perform communication by various communication protocols.

The vehicle 100 may include a communication unit 110, a control unit 120, a storage unit 130, and a vehicle driver 140. The configuration of the vehicle 100 is not necessarily an essential configuration, and may include more or fewer components.

According to an embodiment, the communicator 110 may communicate with the smart key 10 and the first communicator 111 capable of performing a short range, and the second communicator 112 capable of communicating with the wireless power transmitter 200 installed in the vehicle. ) May be included. As described above, the first communication unit 111 may include at least one module capable of communicating with the smart key 10. In addition, the second communication unit 112 may be configured of at least one module capable of communicating with the wireless power transmitter 112. For example, the second communication unit 112 may be configured as a CAN communication module. The second communication unit 112 may be a module for performing communication with components included in the vehicle as well as the wireless power transmitter 112.

The controller 120 may control the overall operation of driving in the vehicle. In particular, the control unit 120 may generate a control signal for searching for a smart key in a vehicle according to an exemplary embodiment. The condition for the smart key search may be executed when the start and operation of a component in the vehicle is detected, such as opening / closing a door, detecting an input of a start button, or inputting an acceleration and stop pedal. In addition, the controller 120 may control to transmit the information on the smart key search result in the vehicle to the in-vehicle output device (not shown) or the wireless power transmitter 200 through the communication unit 110. In addition, the controller 120 may control each vehicle driving unit 140 such as opening / closing a door or starting control of the vehicle, which is input through the smart key 10.

The storage unit 130 may store control information and a program for driving the wireless power transmitter 200. In addition, the storage 130 may store identifier information for the smart key 10. The information of the smart key 10 is to be limited to the smart key 10 registered in the vehicle 100 so that the operation of the vehicle 10 can be controlled.

The wireless power transmitter 200 may be mounted in a vehicle and wirelessly transmit power to the wireless power receiver 300 included in the electronic device 30 for the user's convenience in the vehicle. Therefore, the electronic device 30 may be charged by the power applied from the wireless power transmitter 200 even in the vehicle. In particular, the wireless power transmitter 200 may control the transmission power according to whether the smart key 10 exists in the vehicle through communication with the vehicle 100 according to an embodiment.

Hereinafter, the configuration and operation of a wireless power transmitter and a wireless power receiver for receiving wireless power by the wireless power transmitter will be described in detail with reference to the accompanying drawings.

2, the wireless power transmitter 200 may include a power converter 210, a power transmitter 220, a first communication unit 230, a second communication unit 240, a controller 450, and a storage unit ( 470 and the sensing unit 280 may be configured. It should be noted that the configuration of the wireless power transmitter 200 is not necessarily an essential configuration and may include more or fewer components.

The power converter 210 may perform a function of converting power into power of a predetermined intensity when power is supplied from the power supply unit 260.

To this end, the power converter 210 may include a DC / DC converter 211 and an amplifier 212.

The DC / DC converter 211 may perform a function of converting DC power supplied from the power supply unit 260 into DC power having a specific intensity according to a control signal of the controller 240.

The amplifier 212 may adjust the intensity of the DC / DC converted power according to the control signal of the controller 240. For example, the controller 240 may receive the power reception state information or the power control signal of the wireless power receiver through the first communication unit 230, and based on the received power reception state information or the power control signal. The amplification factor of the amplifier 212 can be dynamically adjusted. For example, the power reception state information may include, but is not limited to, strength information of the rectifier output voltage and strength information of a current applied to the receiving coil. For example, the power control signal may include a signal for requesting power increase, a signal for requesting power reduction, and the like. Therefore, when receiving the smart key undetected signal in the vehicle through the control unit of the vehicle through the second communication unit 240 according to an embodiment, the amount of power applied to the wireless power receiver under the control of the control unit 250 is reduced. You can. In addition, when the smart key detection signal is received in the vehicle, the amount of power applied to the wireless power receiver may be increased under the control of the controller 250.

The power transmitter 220 may include a driver 221 and a transmission coil 222.

In addition, the driver 221 may include a multiplexer (or multiplexer) (not shown), and a carrier generator (not shown) for generating a specific operating frequency and a specific duty ratio for power transmission. For example, the carrier generator may generate a specific frequency for converting the output DC power of the amplifier 212 received through the multiplexer into AC power having a specific frequency. In one example, the AC signal generated by the carrier generator is mixed with the output terminal of the multiplexer, and thus AC power is generated. However, this is only one embodiment, and the other stage is before or after the amplifier 212. Can be mixed in.

In addition, as shown in the drawing, the power transmitter 220 may include a plurality of transmission coils of the multiplexer of the driver 221 for controlling the output power of the amplifier 212 to be transmitted to the transmission coil.

The second communication unit 240 may be configured of at least one module for performing communication with the communication unit of the vehicle. For example, the second communication unit 240 may communicate with the communication unit in the vehicle and receive a signal indicating whether the smart key is detected in the vehicle according to an embodiment. For example, the second communication unit 240 may be configured as a controller area network (CAN) communication module. However, this is not limited and may be variously applied according to the communication module configured in the vehicle.

The sensing unit 280 may include at least one of a current sensor, a voltage sensor, and a temperature sensor.

More specifically, the sensing unit 280 may measure the driving current of the DC converted by the power converter 210 using the current sensor and provide the measured current to the controller 250. In addition, the sensing unit 280 may measure an internal temperature of the wireless power transmitter 200 to determine whether overheating occurs using a temperature sensor, and provide the measurement result to the controller 250.

The storage unit 270 may store data and a program for communicating with an in-vehicle communication unit according to an exemplary embodiment. In addition, the storage unit 270 may store the power intensity information based on the smart key detection signal in the vehicle under the control of the controller 250. For example, the storage unit 270 may store power intensity information according to the first charging mode and other power intensity information in the second charging mode. In addition, the storage unit 270 may store information on the threshold power value based on the control signal of the control unit 270. The threshold power value may be a power level applied to the wireless power receiver when wireless charging is executed when the smart key in the vehicle is not detected.

The controller 250 may execute overall control of the components constituting the wireless power transmitter 200. For example, the controller 250 may determine whether the smart key in the vehicle is detected based on the signal received through the second communication unit 240. The controller 250 may control the amount of power applied to the wireless power receiver according to whether the smart key received through the second communication unit 240 is detected.

For example, the controller 250 may control the power applied to the wireless power receiver with low power when the smart key non-detection signal is received in the vehicle through the second communication unit 240. The low power may be a threshold power value. Alternatively, the low power may be a value equal to or less than a power value applied to the wireless power receiver according to the first charging mode. On the other hand, when the control unit 250 receives the smart key detection signal in the vehicle through the second communication unit 240 may control the power applied to the wireless power receiver to a high power. The high power may be a power value of a second charging mode which is a fast charging mode. Alternatively, the high power value may be defined as a power value exceeding the low power value. In addition, the controller 250 may transmit a power value applied to the wireless power receiver based on a signal received through the second communication unit 240 even during the first charging mode or the second charging mode. ) And the power converter 430.

The modulator 231 may modulate the control signal generated by the controller 250 and transmit the modulated control signal to the driver 221. Herein, the modulation scheme for modulating the control signal is a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a PSK (Phase Shift Keying) modulation scheme, a pulse width modulation scheme, a differential 2 Differential bi-phase modulation schemes may be included, but is not limited thereto.

When a signal received through the transmitting coil is detected, the demodulator 232 may demodulate the detected signal and transmit the demodulated signal to the controller 250. Here, the demodulated signal includes a received power indicator, a signal strength indicator, an identification indicator, a configuration indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge (EOC) indicator, and an overvoltage It may include / over current / overheat indicator, but is not limited thereto, and may include various state information for identifying the state of the wireless power receiver.

In addition, the demodulator 232 may identify from which transmission coil the demodulated signal is received, and may provide the control unit 250 with a predetermined transmission coil identifier corresponding to the identified transmission coil.

For example, the wireless power transmitter 200 may obtain the signal strength indicator through in-band communication using the same frequency used for wireless power transmission to communicate with the wireless power receiver.

In addition, the wireless power transmitter 200 may not only transmit wireless power using the transmission coil 222, but also exchange various information with the wireless power receiver through the transmission coil 222. As another example, the wireless power transmitter 200 may be connected to the wireless power receiver using separate coils corresponding to the plurality of transmission coils 222-that is, the first to nth transmission coils. Band communication may be performed.

3 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to FIG. 2.

Referring to FIG. 3, the wireless power receiver 300 includes a receiving coil 310, a rectifier 320, a DC / DC converter 630, a load 340, a sensing unit 350, and a communication unit ( 360, the main control unit 370 may be configured. Here, the communicator 360 may include at least one of a demodulator 361 and a modulator 362.

Although the wireless power receiver 300 shown in the example of FIG. 3 is illustrated as being capable of exchanging information with the wireless power transmitter 400 through in-band communication, this is only one embodiment. The communicator 360 according to an exemplary embodiment may provide short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.

AC power received through the receiving coil 310 may be delivered to the rectifier 320. The rectifier 320 may convert AC power into DC power and transmit the DC power to the DC / DC converter 330. The DC / DC converter 330 may convert the strength of the rectifier output DC power into a specific intensity required by the load 340 and then transmit the converted power to the load 340. In addition, the receiving coil 310 may be configured to include a plurality of receiving coils (not shown), that is, the first to n-th receiving coil. Frequency of AC power delivered to each receiving coil (not shown) according to one embodiment may be different from each other, another embodiment is a predetermined frequency controller with a function to adjust the LC resonance characteristics differently for each receiving coil It is also possible to set a different resonant frequency for each receiving coil by using a.

The sensing unit 350 may measure the intensity of the rectifier 320 output DC power and provide the same to the main controller 370. In addition, the sensing unit 350 may measure the strength of the current applied to the receiving coil 310 according to the wireless power reception, and may transmit the measurement result to the main control unit 370. In addition, the sensing unit 350 may measure the internal temperature of the wireless power receiver 300 and provide the measured temperature value to the main controller 370.

The main controller 370 may determine whether the overvoltage is generated by comparing the measured rectifier output DC power with a predetermined reference value. As a result of the determination, when the overvoltage is generated, a predetermined packet indicating that the overvoltage has occurred may be generated and transmitted to the modulator 362. Here, the signal modulated by the modulator 362 may be transmitted to the wireless power transmitter through the receiving coil 310 or a separate coil (not shown).

In addition, the main controller 370 may determine that the sensing signal is received when the intensity of the rectifier output DC power is greater than or equal to a predetermined reference value. When the sensing signal is received, a signal strength indicator corresponding to the sensing signal may be modulated by the modulator 362. Can be transmitted to the wireless power transmitter.

In addition, when the strength of the rectifier output DC power is less than or equal to a predetermined reference value, the main controller 370 may determine that power transmission is interrupted. It can be controlled to be transmitted to the wireless power transmitter through.

The demodulator 361 demodulates an AC power signal or a rectifier 320 output DC power signal between the receiving coil 310 and the rectifier 320 to identify whether a detection signal is received, and then identifies an identification result. Can be provided to The main controller 370 may control a signal strength indicator corresponding to the sensing signal to be transmitted through the modulator 362.

Referring to FIG. 4, the packet format 400 used for exchanging information between the wireless power transmitter 200 and the wireless power receiver 300 may acquire synchronization for demodulation of the packet and accurate start bits of the packet. Preamble (410) field for identification, a header (Header, 420) field for identifying the type of message included in the packet, a message for transmitting the contents (or payload) of the packet ( Message, 430) and a checksum (440) field for identifying whether an error has occurred in the corresponding packet.

As shown in FIG. 4, the packet receiving end may identify the size of the message 430 included in the packet based on the value of the header 420.

In addition, the header 420 may be defined in each step of the wireless power transfer procedure, and in part, the header 420 value may be defined as a different type of message although the same value is used in different steps. For example, it should be noted that the header values corresponding to the end power transfer of the ping step and the end of the power transfer of the power transfer step may be equal to 0x02.

The message 430 includes data to be transmitted at the transmitting end of the packet. For example, the data included in the message 430 field may be a report, a request, or a response to the counterpart, but is not limited thereto.

According to another exemplary embodiment, the packet 400 may further include at least one of transmitter identification information for identifying a transmitter that transmitted the packet, and receiver identification information for identifying a receiver for receiving the packet. Here, the transmitter identification information and the receiver identification information may include IP address information, MAC address information, product identification information, and the like, but are not limited thereto and may be information capable of distinguishing a receiver and a transmitter from a wireless charging system.

According to another exemplary embodiment, the packet 400 may further include predetermined group identification information for identifying the corresponding reception group when the packet is to be received by a plurality of devices.

Referring to FIG. 5, in the pinging step, the wireless power receiver may transmit a signal strength packet or a power transmission stop packet.

Referring to reference numeral 501 of FIG. 5, a message format of a signal strength packet according to an embodiment may be configured as a signal strength value having a size of 1 byte. The signal strength value may indicate a degree of coupling between the transmitting coil and the receiving coil, and is calculated based on the rectifier output voltage in the digital ping period, the open circuit voltage measured by the output disconnect switch, the intensity of the received power, and the like. It may be a value. The signal strength value may range from a minimum of 0 to a maximum of 255, and may have a value of 255 when the actual measured value U for a particular variable is equal to the maximum value Umax of the variable.

As an example, the signal strength value may be calculated as U / Umax * 256.

Referring to reference numeral 502 of FIG. 5, a message format of a power transmission interruption packet according to an embodiment may be configured as an end power transfer code having a size of 1 byte.

The reason why the wireless power receiver requests the wireless power transmitter to stop power transmission is because of charge complete, internal fault, over temperature, over voltage, over current, and battery. It may include, but is not limited to, Battery Failure, Reconfigure and No Response, and Noise Current. It should be noted that the power transfer abort code may be further defined in response to each new power transfer abort reason.

The charging completion may be used that the charging of the receiver battery is completed. Internal errors can be used when a software or logical error in receiver internal operation is detected.

The overheat / overvoltage / overcurrent can be used when the temperature / voltage / current values measured at the receiver exceed the thresholds defined for each.

Battery damage can be used if it is determined that a problem has occurred with the receiver battery.

Reconfiguration can be used when renegotiation for power transfer conditions is required.

No response may be used if it is determined that the transmitter's response to the control error packet, i.e., to increase or decrease the power strength, is not normal.

Unlike the overcurrent, the noise current is a noise generated when switching in the inverter and may be used when the noise current value measured at the receiver exceeds a defined threshold value.

Referring to FIG. 6, a message format of an identification packet includes a version information field, a manufacturer information field, an extension indicator field, and a basic device identification information field. Can be configured.

In the version information field, revision version information of a standard applied to a corresponding wireless power receiver may be recorded.

In the manufacturer information field, a predetermined identification code for identifying the manufacturer who manufactured the corresponding wireless power receiver may be recorded.

The extension indicator field may be an indicator for identifying whether an extension identification packet including extension device identification information exists. For example, if the extension indicator value is 0, it may mean that there is no extension identification packet. If the extension indicator value is 1, it may mean that the extension identification packet is present after the identification packet.

Referring to reference numerals 601 to 602, if the extension indicator value is 0, the device identifier for the corresponding wireless power receiver may be a combination of manufacturer information and basic device identification information. On the other hand, if the extended indicator value is 1, the device identifier for the corresponding wireless power receiver may be a combination of manufacturer information, basic device identification information and extended device identification information.

Referring to FIG. 7, as shown in FIG. 701, a message format of a configuration packet may have a length of 5 bytes, and includes a power class field, a maximum power field, and a power control. It may be configured to include a Control field, a Count field, a Window Size field, a Window Offset field, and the like.

The power class assigned to the wireless power receiver may be recorded in the power class field.

In the maximum power field, the strength value of the maximum power that can be provided by the rectifier output of the wireless power receiver may be recorded.

As an example, when the power rating is a and the maximum power is b, the maximum power amount Pmax desired to be provided at the rectifier output of the wireless power receiver may be calculated as (b / 2) * 10a.

The power control field may be used to indicate according to which algorithm the power control in the wireless power transmitter should be made. For example, if the power control field value is 0, this means that the power control algorithm is defined in the standard, and if the power control field value is 1, it may mean that power control is performed according to an algorithm defined by the manufacturer.

The count field may be used to record the number of option configuration packets to be transmitted by the wireless power receiver in the identification and configuration steps.

The window size field may be used to record the window size for calculating the average received power. As an example, the window size may be a positive integer value greater than 0 and having a unit of 4 ms.

The window offset field may record information for identifying the time from the end of the average received power calculation window to the start of the transmission of the next received power packet. As an example, the window offset may be a positive integer value greater than 0 and having a unit of 4 ms.

Referring to reference numeral 702, the message format of a power control hold packet may be configured to include a power control hold time T_delay. A plurality of power control pending packets may be sent during the identification and configuration phase. For example, up to seven power control pending packets may be transmitted. The power control hold time T_delay may have a value between a predefined power control hold minimum time T_min: 5 ms and a power control hold maximum time T_max: 205 ms. The apparatus for transmitting power wirelessly may perform power control by using the power control holding time of the last power control holding packet received in the identification and configuration step. In addition, the wireless power transmitter may use the T_min value as the T_delay value when the power control pending packet is not received in the identification and configuration steps.

The power control holding time may refer to a time during which the wireless power transmitter waits without performing power control after receiving the most recent control error packet and before performing the actual power control.

8 is a diagram illustrating a structure of a charging mode packet for requesting a charging mode change according to an embodiment of the first wireless power transmission procedure.

Referring to FIG. 8, the header value of the charging mode packet may be any one of undefined values among packet header values defined in the current wireless charging standard. For example, the header value of the charging mode packet may be defined as 0x18, as shown in FIG. 8, but it should be noted that this is for convenience of description and need not necessarily be the value.

The message size corresponding to the header value 0x18 may be 1 byte.

Information on a charging mode to be changed may be recorded in a message field of the charging mode packet. For example, referring to reference numeral 810, when a change to the second charging mode is required during charging in the first charging mode, the wireless power receiver may record 0xff in the message field of the charging mode packet and transmit the same. On the other hand, if a change to the first charging mode is required during charging in the second charging mode, the wireless power receiver may write 0x00 in the message field of the charging mode packet and transmit the same. The example shown in reference numeral 810 is only for the understanding of the present invention, and the message value is not necessarily defined as such.

Referring to FIG. 9, the transmitting step 900 of transmitting power from the wireless power transmitter to the wireless power receiver may include a first charging mode 910 and a second charging mode 920. For example, the first charging mode 910 may be a case where charging is performed at a general low power. The second charging mode 920 may be a case of performing charging at high power.

The first charging mode 910 and the second charging mode 920 may be interchanged when a predetermined condition is satisfied. For example, when the wireless power receiver receives a request for switching to the second charging mode 920 from the electronic device while performing charging in the first charging mode 910, the wireless power receiver notifies the wireless power transmitter of the switching to the second charging mode 920. The charging mode may be changed by transmitting a request packet. As another example, the wireless power receiver may transmit a predetermined packet to the wireless power transmitter requesting the switch to the first charging mode 910 when the battery charging amount reaches a predetermined reference value during the charging to the second charging mode 920. have.

The wireless power transmitter according to another embodiment may transmit power to a plurality of wireless power receivers. In this case, when the wireless power receiver is newly connected or the connection with the existing wireless power receiver is released, a power redistribution procedure for the currently connected wireless power receiver (s) may be performed. If, as a result of the power redistribution, the wireless power transmitter can no longer provide high power to the wireless power receiver charging in the second charging mode, the wireless power transmitter transmits the first charging mode 910 to the corresponding wireless power receiver in the second charging mode 920. It may also send a predetermined packet requesting the switch to.

In the above exemplary embodiment, the charging mode is divided into the first charging mode 910 and the second charging mode 920. For example, the charging mode is only one embodiment, and a new charging mode (the third charging mode) is described. May be defined and added. For example, the second charging mode 920 for fast charging may be subdivided into an intermediate power fast charging mode (not shown) and a high power fast charging mode (not shown). For example, the medium power fast charging mode (not shown) may output an average of 9W of power. The high power fast charging mode (not shown) can deliver an average power of 15W. Without being limited to the above example, the medium power fast charging mode (not shown) and the high power fast charging mode (not shown) may be defined in other meanings.

The initial charging mode according to an embodiment may be determined by exchanging or negotiating state information between the wireless power transmitter and the wireless power receiver in the identification and configuration steps.

For example, in the identifying and configuring step, the wireless power transmitter may transmit predetermined information for identifying whether the device is capable of supporting the second charging mode to the wireless power receiver. When the wireless power receiver is a device capable of the second charging mode and the battery charge amount is less than or equal to a predetermined reference value, the wireless power receiver may transmit a predetermined packet requesting the second charging mode to the wireless power transmitter. When the wireless power transmitter normally enters the power transmission step, the wireless power transmitter may switch to the second charging mode at the request of the wireless power receiver to perform wireless charging.

According to another embodiment, the initial charging mode may be determined in the power transmission step. For example, when the wireless power transmitter receives an initial power control request packet, for example, but not limited to, a control error packet defined in the WPC standard, the wireless power transmitter enters a power transmission step. The first packet for identifying whether the second charging mode is supported may be transmitted. When the wireless power receiver receives the first packet and determines that the connected wireless power transmitter supports the second charging mode, the wireless power receiver determines whether to start charging in the second charging mode, and includes a predetermined first response including the determination result. The packet may be sent to a wireless power transmitter. That is, the initial charging mode may be determined based on the first response packet.

In addition, according to the present embodiment, the wireless power transmitter may execute a power transmission step using power or threshold power according to the first charging mode according to a signal for detecting a smart key in a vehicle received through the second communication unit. In detail, when the wireless power receiver is detected, the wireless power transmitter may execute the first charging mode or the second charging mode according to the determined charging mode. However, when the smart key in the vehicle is not detected through the second communication unit, the power level according to the charging mode being executed may be adjusted. For example, the wireless power transmitter may perform power transmission at a power level according to an intermediate power fast charging mode or a high power fast charging mode which is a second charging mode. When the smart key non-detection signal is received in the vehicle through the second communication unit, the second charging mode may switch to the micro power transmission mode capable of executing power transmission in the first charging mode or the threshold power. Meanwhile, when the smart key detection signal is received through the second communication unit during the power transmission step by switching to the first charging mode or the micro power transmission mode, the power transmission mode may be performed by returning to the charging mode that was previously executed. .

Hereinafter, the power transmission operation of the wireless power transmitter according to the embodiment will be described in detail.

Referring to FIG. 10, the wireless power transmitter may detect the wireless power receiver (S1002).

In detail, when the wireless power transmitter detects the wireless power receiver, the wireless power transmitter may perform an operation for performing a power transmission step and determine a charging mode.

The wireless power transmitter may execute the micro power transmission mode according to an embodiment when the wireless power receiver is detected (S1004). Specifically, when the wireless power receiver is detected, the wireless power transmitter first charge mode or second charge. The micro power transmission mode may be executed until the smart key recognition signal in the vehicle is received through the second communication unit before executing the power transmission step in any of the charging modes.

The wireless power transmitter determines whether the smart key recognition signal is received through the second communication unit during the execution of the fine power transmission mode (S1006). When the smart key signal is received, an operation signal may be generated by the smart key in the vehicle. It may be a time point. In addition, as a smart key signal reception time, a sensing operation for checking whether a smart key is present in the vehicle may be executed in real time or periodically during vehicle operation. The smart key detection signal will be described in detail with reference to FIG. 11.

When the wireless power transmitter receives the smart key recognition signal during the execution of the fine power transmission mode (S1004), the wireless power transmitter may determine that the smart key exists in the vehicle and the wireless power receiver exists at a location where there is no interference. Therefore, the wireless power transmitter may switch to the power transmission mode identified at the time when the wireless power receiver is detected in the execution of the fine power transmission mode, and continue the power transmission step. If it is detected that the fast charging mode is enabled, the power transmission step may be maintained by switching from the fine power transmission mode to the fast charging mode which is the second charging mode.

On the other hand, if the smart key recognition signal is not received during the execution of the fine power transmission mode (S1004), the wireless power transmitter may determine the number of non-receipts. In operation S1012, when the smart key detection signal is not received from the in-vehicle communication unit, the vehicle does not operate or where interference may occur with the in-vehicle wireless power transmitter. It may be the case that the smart key exists and cannot be retrieved. For example, when the smart key is placed on the upper surface of the wireless power transmitter, the smart key may not be detected in the vehicle. To solve this problem, the fine power transfer mode may be stopped because the smart key may be damaged even if the power transfer is performed with fine power.

In the exemplary embodiment, when the smart key detection signal is not received, the smart key detection is defined as an example of not detecting the smart key. However, the present invention is not limited thereto, and according to an exemplary embodiment, the controller of the vehicle may transmit the smart key non-detection information to the wireless power transmitter through the second communication unit, so that the wireless power transmitter may recognize the smart key undetected.

According to an embodiment, the power value transmitted to the wireless power receiver in the fine power transmission mode may be a value of 5W or less transmitted in the low power transmission mode which is the first charging mode. In addition, as described above, the second charging mode may transmit 15w power, which is a high power fast charging mode, or 9W power, which is an intermediate power fast charging mode.

Hereinafter, an operation for detecting a smart key in a vehicle according to the present embodiment will be described in detail.

Referring to FIG. 11, an in-vehicle control unit according to an embodiment may detect a smart key input signal of a vehicle through a first communication unit. (S1102) Specifically, the control unit may open or close the door of the vehicle through the first communication unit. A signal input from a smart key may be detected, such as a vehicle start key input. In addition, the smart key input signal may be a search condition for searching for the smart key in real time or periodically, as a signal for driving the vehicle is input.

When the smart key input signal is detected, the controller may continuously communicate with the first communication unit to detect whether the smart key exists in or adjacent to the vehicle in real time or periodically. (S1104)

The controller determines whether the smart key is detected in the vehicle or in the vicinity of the vehicle at the time of executing the smart key search (S1106).

The controller may communicate with the smart key through the first communication unit, and may receive a detection signal from the smart key when the smart key exists in or near the vehicle. The controller may transmit a smart key detection signal to the wireless power transmitter through the second communication unit (S1108).

In more detail, the smart key detection signal transmitted to the wireless power transmitter may be defined as the smart key located in or near the vehicle and not present in a location where mutual interference occurs in the wireless power transmitter.

Therefore, the controller may transmit the smart key detection information to the wireless power transmitter so that the wireless power transmitter can perform a preset normal power transfer mode.

On the other hand, the controller executes the smart key search (S1104) and if the smart key is not detected by checking the number of undetected times to determine whether or not detected more than the reference number of times (S1110).

The controller may execute the smart key not detected alarm in the vehicle when the number of times the smart key is not detected is equal to or greater than the reference number. The execution of the alarm may be output to the audio device or displayed on the display device. Specifically, in the case of non-sensing smart key, the smart key does not exist in the vehicle or in the vicinity of the vehicle. In addition, according to an embodiment, the smart key may be defined as a state in which the smart key is adjacent to or placed on one side. In this case, when the wireless power transmitter executes the second charging mode, internal damage of the smart key may be caused.

The controller does not transmit the information according to the smart key not detected to the wireless power transmitter. Therefore, the wireless power transmitter determines that the smart key is not detected when the smart key detection signal is not received.

In another embodiment, the controller may transmit the smart key non-detection information to the wireless power transmitter. In this case, since the wireless power transmitter can quickly recognize the undetected smart key, power transmission control can be performed quickly.

On the other hand, the embodiment has been described as an example of outputting an alarm or transmitting the smart key undetected information to the wireless power transmitter when the smart key is not detected. However, the present invention is not limited thereto, and even when the undetected signal is received only once, an alarm may be output or the smart key undetected information may be transmitted to the wireless power transmitter.

Referring to FIG. 12, the wireless power transmitter may receive a smart key recognition signal from a control unit of the vehicle (S1202). When the wireless power receiver is detected (S1204), the wireless power transmitter executes the second charging mode. Specifically, in operation S1206, the wireless power transmitter transmits the smart key recognition result to the second communication unit when the control unit in the vehicle detects the smart key search result by the smart key search condition or the smart key in the vehicle or the adjacent area of the vehicle. Can be received. When a wireless power receiver that is a wireless charging target is detected by the wireless power transmitter, one of the charging modes may be executed at the request of the receiver among the first charging mode and the second charging mode. In the present embodiment, the second charging mode for executing the fast charging mode will be described as an example.

The wireless power transmitter may determine whether the smart key non-detection signal is received from the vehicle controller while executing the second charging mode (S1208). Specifically, the controller in the vehicle may perform the smart key in real time or periodically after detecting the smart key. You can check whether it is recognized. Therefore, the wireless power transmitter may also acquire information on whether the smart key is recognized.

Therefore, when the wireless key transmission device receives the smart key non-detection signal while executing the second charging mode, the wireless power transmission apparatus may switch the charging mode to the fine power transmission mode (S1210). When the detection signal is received or the smart key detection signal is not received, the smart key is defined as present in the interference area by the wireless power transmitter, and the charging mode is switched to the fine power transmission mode in order to reduce the damage of the smart key. can do.

Thereafter, the wireless power transmitter transmits power to the wireless power receiver according to the fine power transmission mode. The power value transmitted in the fine power transfer mode may be equal to or less than the power value in the low power transfer mode. In detail, the power value transmitted in the fine power transfer mode may be 5 W or less. However, the present invention is not limited thereto, and a power value such that damage to the smart key may be minimized by power transmitted during wireless charging may be sufficient.

Thereafter, the wireless power transmitter checks whether the smart key detection signal is received during the execution of the fine power transmission mode (S1214). When the smart key detection signal is received, the wireless power transmitter returns to the power transmission mode before the fine power transmission mode to perform the charging mode. You can run According to an embodiment, the returned power transfer mode may be a second charging mode.

Meanwhile, the wireless power transmitter may stop the execution of the fine power transmission mode when the smart key detection signal is not received or the smart key non-detection information is received according to an embodiment. When the smart key detection signal is not received more than the reference number of times or when the smart key non-detection signal is received more than the reference number of times, the fine power transmission mode may be stopped.

The above detailed description should not be construed as limiting in all respects but should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The present invention can be used in the field of wireless power transmission and reception.

Claims

A wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver,

Executing a charging mode of either the first charging mode or the second charging mode;

Checking the smart key not detected in the vehicle;

A charging mode changing step of changing the running charging mode into a fine power transmission mode; And

Performing charging in the fine power transfer mode;

And a charging mode returning step of returning to a previously executed charging mode when receiving the smart key detection signal during the fine power transmission mode.
The method of claim 1,

Checking the smart key not detected in the vehicle

And receiving and confirming a smart key undetected signal from the vehicle.
Following claim 1

Checking the smart key not detected in the vehicle

Wireless charging method comprising the step of not receiving a smart key detection signal from the vehicle.
The method of claim 1,

The first charging mode is a low power charging mode,

The second charging mode is a fast charging mode,

The power value transmitted in the fine power transfer mode is less than the power value transmitted in the first charging mode.
The method of claim 4, wherein

The power transmitted in the fine power transmission mode is less than 5W wireless charging method.
The method of claim 1,

And stopping the micro power transmission mode if a smart key detection signal is not received while performing the charging in the micro power transmission mode.
A wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver,

Checking the smart key not detected in the vehicle;

Executing a fine power transfer mode; And

Receiving a smart key sensing signal during execution of the fine power transfer mode;

And a charging mode changing step of changing from the fine power transmission mode to any one of a first charging mode and a second charging mode.
The method of claim 7, wherein

The charging mode changing step

And changing to correspond to a charging mode received from the wireless power receiver.
The method of claim 7, wherein

The first charging mode is a low power charging mode,

The second charging mode is a fast charging mode,

And a power value transmitted in the fine power transfer mode is equal to or less than a power value transmitted in the first charge mode.
The method of claim 7,

The wireless charging method stops the fine power transfer mode when the smart key is not detected during the execution of the fine power transfer mode.