KR20190036721A - Wireless charging apparatus, wireless charaing terminal and wireless charginh system having the same - Google Patents

Abstract

The present invention relates to a wireless charging terminal, a wireless charging transmitter and a wireless charging system including the same. According to an embodiment of the present invention, the wireless charging terminal comprises: a wireless power receiving unit receiving power from a wireless power transmitter; a battery charged by the received power; a power source controlling unit controlling charging of the battery and detecting temperature information of the battery when charging; and a terminal controlling unit receiving the battery temperature information from the power source controlling unit and outputting a charging control signal of the battery based on the temperature information. The wireless power receiving unit detects the battery temperature information and transmits the battery temperature information and the charging control signal received from the terminal controlling unit to the wireless power transmitter.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless charging transmitter, a wireless charging terminal, and a wireless charging system including the wireless charging terminal.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless charging technique, and more particularly to a wireless charging transmitter, a wireless charging terminal and a wireless charging system including the same.

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

2. Description of the Related Art [0002] Generally, as an example of an electrical connection between a charging device and a battery for charging electric power of a battery, a commercial electric power is supplied to a terminal for converting electric power into voltage and current corresponding to the battery, Supply method. This type of terminal supply is accompanied by the use of physical cables or wires. Therefore, when handling a lot of terminal-supplied equipment, many cables occupy considerable work space, are difficult to organize, and are not well apparent. Also, the terminal supply method may cause problems such as instantaneous discharge due to different potential difference between terminals, burnout due to foreign substances, fire, natural discharge, battery life and deterioration of performance.

In order to solve such a problem, a charging system (hereinafter referred to as a "wireless charging system") and a control method using a method of transmitting power wirelessly are proposed. In addition, since the wireless charging system has not been installed in some portable terminals in the past and the consumer has to purchase a separate wireless charging receiver accessory, the demand for the wireless charging system is low, but the wireless charging user is expected to increase rapidly. Wireless charging function is expected to be equipped basically.

Generally, a wireless charging system comprises a wireless power transmitter for supplying electric energy in a wireless power transmission mode and a wireless power receiver for receiving electric energy supplied from a wireless power transmitter to charge the battery.

Such a wireless charging system may transmit power by at least one wireless power transmission scheme (e.g., electromagnetic induction scheme, electromagnetic resonance scheme, RF wireless power transmission scheme, etc.).

On the other hand, as various devices are equipped with a wireless charging function and the intensity of power required for wireless charging is increased, the power of the wireless power receiver is increased due to the input signal of high intensity, and the emission of electromagnetic waves is increased. If the temperature increases due to the heat generation, the wireless power receiver may cause a problem such as deterioration of wireless power reception performance or damage to the internal system. In addition, a wireless power receiver may suffer from a load impairment if the load is a battery, even if the charging state is close to the buffer, receiving a high-intensity input signal. The wireless power receiver then requests the wireless power transmitter to control the power transmission according to the state of charge of the wireless power receiver. For example, a wireless power receiver may reduce the power transmission of the wireless power transmitter or shut off the charging to protect the battery when the battery temperature is above a certain temperature. However, since the wireless power transmitter can not know the state of charge of the wireless power receiver, the wireless power transmitter operates passively by the wireless power receiver, so that the wireless charging can not be efficiently controlled.

It is an object of the present invention to provide a wireless charging transmitter, a wireless charging terminal and a wireless charging system including the same.

It is still another object of the present invention to provide a wireless charging transmitter, a wireless charging terminal and a wireless charging system including the same, wherein the wireless power transmitter is capable of determining the charging state of the wireless power receiver.

It is still another object of the present invention to provide a wireless charging transmitter, a wireless charging terminal and a wireless charging system including the same, wherein the wireless power transmitter is capable of actively controlling charging according to the charging state of the wireless power receiver.

Yet another object of the present invention is to provide a wireless charging transmitter, a wireless charging terminal and a wireless charging system including the wireless charging transmitter, wherein the wireless power transmitter improves the charging time by optimizing the charging environment according to the charging state of the wireless power receiver.

Still another object of the present invention is to provide a wireless charging transmitter, a wireless charging terminal and a wireless charging system including the wireless charging transmitter, which prevents a charging stop due to a heating phenomenon of a wireless power receiver.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

A wireless charging terminal according to an embodiment of the present invention includes a wireless power receiver for receiving power from a wireless power transmitter; A battery charged with the received power; A power control unit for controlling the charging of the battery and sensing temperature information of the battery upon charging; And a terminal controller for receiving the battery temperature information from the power controller and outputting a charge control signal of the battery based on the temperature information, wherein the wireless power receiver detects the battery temperature information, Information and a charge control signal received from the terminal control unit to the wireless power transmitter.

Also, the wireless power transmitter according to the present embodiment may include a power transmitting unit including a driving unit for controlling output power provided to one or more transmitting coils and one or more transmitting coils; A control unit for controlling the output power corresponding to the battery temperature information and the charge control signal received from the wireless charging terminal; And a storage unit for storing battery temperature information received from the wireless charging terminal and a charging control signal corresponding thereto, wherein the controller controls charging power based on battery temperature information received from the wireless charging terminal during wireless charging do.

The wireless charging system according to this embodiment may also include a wireless power transmitter for transmitting power to a wireless power receiver, a wireless power transmitter for receiving power from the wireless power transmitter, charging the battery with received power, And a wireless charging terminal for transmitting temperature information and charging control information of the battery, wherein the wireless power transmitter stores temperature information and charging control information received from the wireless charging terminal, And controls the charging power based on the temperature information.

Effects of the wireless charging method and the apparatus and system for the same according to the present invention will be described as follows.

The present invention can provide a wireless charging method and apparatus and system therefor.

The present invention also allows the wireless power transmitter to determine the state of charge of the wireless power receiver.

In addition, the present invention enables the wireless power transmitter to actively control charging according to the state of charge of the wireless power receiver.

The present invention also allows the wireless power transmitter to control the charging power according to the charging state of the wireless power receiver.

The present invention also allows the wireless power transmitter to optimize the charging power according to the charging state of the wireless power receiver to improve the charging time.

Further, the present invention improves the heat phenomenon of the wireless power receiver, thereby preventing the charging stop.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that 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 embodiment.
2 is a block diagram illustrating a structure of a wireless power transmitter according to an exemplary embodiment of the present invention.
3 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter of FIG.
4 is a block diagram of a wireless charging terminal including a wireless power receiver to which the present embodiment is applied.
FIG. 5 is an exemplary view for explaining a battery loading state of a wireless charging terminal to which the present embodiment is applied.
FIG. 6 is a diagram illustrating a structure of a battery mounted in a wireless charging terminal to which the present embodiment is applied.
7 is a flowchart illustrating an operation of the wireless charging terminal according to an exemplary embodiment of the present invention.
FIG. 8 is a flowchart illustrating an operation of a wireless power transmitter interworking with the wireless charging terminal of FIG. 7 according to an embodiment.
FIG. 9 is a flowchart illustrating an operation of the wireless charging terminal in the wireless charging mode of FIG. 7 according to an exemplary embodiment of the present invention.
FIG. 10 is a flowchart of the operation of the wireless power transmitter in wireless charging from FIG. 8 onward according to another embodiment.
11 is a flow diagram illustrating the operation of a wireless charging system including a wireless power transmitter and a wireless charging terminal in accordance with another embodiment.
12 is a diagram for explaining a packet format according to a wireless power transmission procedure.
13 is a diagram for explaining a wireless charge stop request signal packet in the packet format.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which the embodiments are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

The present invention is not necessarily limited to these embodiments, as long as all of the constituent elements of the embodiment are described as being combined or operated together. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. The codes and code segments constituting the computer program may be easily deduced by those skilled in the art. Such a computer program may be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing embodiments. As the storage medium of the computer program, a magnetic recording medium, an optical recording medium, a carrier wave medium, or the like may be included.

In the description of the embodiment, in the case of being described as being formed on the "upper or lower", "before" or "after" of each component, (Lower) "and" front or rear "encompass both that the two components are in direct contact with each other or that one or more other components are disposed between the two components.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the description of the embodiments, an apparatus for transmitting wireless power on a wireless power charging system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, , A wireless power transmission device, a wireless power transmitter, a wireless charging device, and the like. For the sake of convenience, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a receiving terminal, a receiving side, a receiving device, a receiver Terminals and the like can be used in combination.

The wireless charging device according to the embodiment may be configured as a pad type, a cradle type, an access point (AP) type, a small base type, a stand type, a ceiling embedded type, a wall type, Power may be transmitted to the device.

As an example, a wireless power transmitter can be used not only on a desk or on a table, but also developed for automobiles and used in a vehicle. A wireless power transmitter installed in a vehicle can be provided in a form of a stand that can be easily and stably fixed and mounted.

A mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation device, an MP3 player, (Hereinafter referred to as a " device ") capable of charging a battery by mounting a wireless power receiving means according to an embodiment, but not limited thereto, may be used for a small electronic device such as a toothbrush, an electronic tag, a lighting device, Quot;), and the term terminal or device may be used in combination. A wireless power receiver according to another embodiment may also be mounted on a vehicle, an unmanned aerial vehicle, an air drone or the like.

Generally, a wireless power transmitter and a wireless power receiver that constitute a wireless power system can exchange control signals or information through in-band communication or Bluetooth low energy (BLE) communication. Here, the in-band communication and the BLE communication can 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, and the like. For example, the wireless power receiver can 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 reception coil in a predetermined pattern. The information transmitted by the wireless power receiver may include various status information including received power intensity information. At this time, the wireless power transmitter can calculate the charging efficiency or the power transmission efficiency based on the received power intensity information.

1 is a block diagram for explaining a wireless charging system according to an embodiment.

Referring to FIG. 1, the wireless charging system includes a wireless power transmission terminal 10 for wirelessly transmitting power, a wireless power receiving terminal 20 for receiving the transmitted power, and an electronic device 30 Lt; / RTI >

For example, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 can perform in-band communication in which information is exchanged using the same frequency band as the operating frequency used for wireless power transmission. As another example, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 may perform out-of-band communication in which information is exchanged using a different frequency band different from the operating frequency used for wireless power transmission.

 For example, information exchanged between the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 may include not only status information but also control information of each other. Here, the status information and the control information exchanged between the transmitting and receiving end will become more apparent through the description of the embodiments to be described later.

The in-band communication and the out-of-band communication may provide bidirectional communication, but the present invention is not limited thereto. In other embodiments, unidirectional communication or half-duplex communication may be provided.

For example, the unidirectional communication may be that the wireless power receiving terminal 20 transmits information only to the wireless power transmitting terminal 10, but the present invention is not limited thereto, and the wireless power transmitting terminal 10 may transmit information to the wireless power receiving terminal 20 It may be transmitting.

In the half duplex communication mode, bi-directional communication is possible between the wireless power receiving terminal 20 and the wireless power transmitting terminal 10, but information can be transmitted by only one device at any time.

The wireless power receiving terminal 20 according to the embodiment may acquire various status information of the electronic device 30. [ For example, the status information of the electronic device 30 may include current power usage information, information for displaying a running application, CPU usage information, battery charge status information, battery output voltage / current information, And is information obtainable from the electronic device 30 and available for wireless power control.

In this embodiment, a structure in which the wireless power receiving terminal 20 is formed inside the electronic device 30 will be described. That is, the wireless power receiving terminal 20 is configured in the wireless charging terminal and the battery of the wireless charging terminal is charged with the power received from the wireless power receiving terminal 20, for example. However, the present invention is not limited thereto, and the wireless power receiving terminal 20 may be configured separately from the wireless charging terminal, which is the electronic device 30, in the space.

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

2, the wireless power transmitter 200 includes a power conversion unit 210, a power transmission unit 220, a wireless charging communication unit 230, a control unit 240, a current sensor 250, a temperature sensor 260, A storage unit 270, and a timer 280. [0035]

As shown in FIG. 2, the power supply unit 100 may supply power. The power supply unit 100 may correspond to a battery built in the wireless power transmitter 200, or may be an external power supply. The example of the power supply unit 100 is not limited to the form of the power supply unit 100.

When power is supplied from the power supply unit 100, the power conversion unit 210 may convert the power to a predetermined intensity.

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

The DC / DC converting unit 211 may convert the DC power supplied from the power supply unit 100 into a DC power having a specific intensity according to a control signal of the controller 240.

The amplifier 212 can adjust the intensity of the DC / DC-converted power according to the control signal of the controller 240. For example, the control unit 240 may receive the power reception status information or the power control signal of the wireless power receiver through the wireless charging communication unit 230, and may control the amplifier 212 based on the received power reception status information or the power control signal. Can be adjusted dynamically. For example, the power reception status information may include, but is not limited to, the intensity information of the current output voltage, the intensity information of the current applied to the reception coil, and the like. The power control signal may include a signal for requesting power increase, a signal for requesting power reduction, and the like.

The current sensor 250 can measure an input current input to the driving unit 221. The current sensor 250 may provide the measured input current value to the control unit 240. [ More specifically, the current sensor 250 may sense the input current input to the driving unit 221 of the power transfer unit 220 and provide the sensed sensing voltage to the control unit 240.

The controller 240 may determine the state of charge of the wireless power receiver based on the input current value measured by the current sensor 250. That is, the controller 240 can determine the state of charge of the wireless power receiver through the change of the input current. The charging state of the wireless power receiver may include a plurality of charging states. The charging states of the plurality of wireless power receivers may include first through fourth charging states. Also, the first to sixth currents may flow in accordance with the first to fourth charging states of the input current. More specifically, the first charging state of the wireless power receiver may be wireless charging in a normal charging mode, a medium power charging mode, or a fast charging mode. That is, the first charging state of the wireless power receiver may be a state in which the charging power by the wireless power receiver is not limited according to the power transmission contract.

The input current of the wireless power transmitter in a first state of charge of the wireless power receiver may flow through a first current. The second charging state of the wireless power receiver may be such that the charging power is limited such that the wireless power receiver reaches a predetermined temperature below a predetermined battery charging rate. In the second state of charge of the wireless power receiver, the input current of the wireless power transmission device can flow a second current. The third state of charge of the wireless power receiver may be a state where the wireless power receiver has reached a predetermined temperature above a predetermined battery charge rate and the wireless charging is interrupted. In a third state of charge of the wireless power receiver, the input current of the wireless power transmitter may flow a third current. The fourth state of charge of the wireless power receiver may be a state in which the wireless power receiver has phased the charge power as the battery charge reaches a predetermined charge rate close to the buffer. The input current of the wireless power transmitter in the fourth charging state of the wireless power receiver may flow in the fourth through sixth current sequences.

The temperature sensor 260 may measure the internal temperature of the wireless power transmitter 200 and provide the measurement result to the control unit 240. More specifically, the temperature sensor 260 may include one or more temperature sensors. As shown in FIG. 4, one or more temperature sensors may be disposed corresponding to the transmission coil 223 of the power transmission unit 220 to measure the temperature of the transmission coil 223. For example, the control unit 240 may adaptively cut off the power supply from the power supply unit 100 or block the power supply to the amplifier 212 based on the temperature value measured by the temperature sensor 260 . To this end, a power cutoff circuit may be further provided at one side of the power conversion unit 210 to cut off the power supplied from the power supply unit 100 or cut off power supplied to the amplifier 212. In another example, the control unit 240 may adjust the intensity of the power supplied to the power transfer unit 220 based on the temperature value measured by the temperature sensor 260. Thus, the wireless power transmitter according to the embodiment can prevent the internal circuit from being damaged due to overheating. As another example, the controller 240 may restart the wireless charging if the internal temperature of the wireless power transmitter 200 drops by a predetermined temperature after the wireless charging is stopped and the third charging state of the wireless power receiver is started.

The power transmitting unit 220 transmits the power signal output from the power converting unit 210 to the wireless power receiver. For this, the power transmitting unit 220 may include a driving unit 221, a selecting unit 222, and one or more transmitting coils 223.

The driving unit 221 may generate an AC power signal having an AC component having a specific frequency inserted into the DC power signal output from the power conversion unit 210 and transmit the generated AC power signal to the transmission coil 223. At this time, the frequencies of the AC power signals transmitted to the plurality of transmission coils included in the transmission coil 223 may be the same or different from each other.

The selecting unit 222 may receive an AC power signal having a specific frequency from the driving unit 221 and may transmit the AC power signal to the transmitting coil selected from among the plurality of transmitting coils. Here, the coil selector 222 may control the AC power signal to be transmitted to the transmission coil selected by the controller 240 in response to the predetermined control signal of the controller 240. [ 4, the selecting unit 222 may include a switch 222 for connecting LC resonant circuits corresponding to the plurality of transmitting coils 223. In this case, The selecting unit 222 may be deactivated in the power transmitting unit 220 when the transmitting coil 223 is composed of one transmitting coil.

The transmitting coil 223 may include at least one transmitting coil and may transmit the AC power signal received from the selecting unit 222 to the receiver through the corresponding transmitting coil. When there are a plurality of transmission coils, the transmission coil may include first to n-th transmission coils. In order to select a corresponding transmission coil among a plurality of transmission coils, the selection unit 222 may be implemented with a switch or a multiplexer (not shown). In addition, the transmission coil may include one capacitor connected in series with the plurality of transmission coils to implement the LC resonance circuit.

The modulation unit 231 may modulate the control signal generated by the control unit 240 and transmit the modulated control signal to the driving unit 221. [ Here, the modulation scheme for modulating the control signal includes a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a phase shift keying (PSK) modulation scheme, a pulse width modulation scheme, A differential bi-phase modulation method, and the like.

The demodulator 232 can demodulate the detected signal and transmit the demodulated signal to the controller 240 when a signal received through the transmission coil is detected. Here, the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge indicator (EOC), an overvoltage / overcurrent / overheat indicator, But is not limited to, various status information for identifying the status of the wireless power receiver.

The demodulating unit 232 may identify which of the transmitting coils the demodulated signal is received and may provide the controlling unit 240 with a predetermined transmitting coil identifier corresponding to the identified transmitting coil.

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

In addition, the wireless power transmitter 200 can transmit wireless power using the transmission coil 223, as well as exchange various information with the wireless power receiver through the transmission coil 223. In another example, the wireless power transmitter 200 may further include a separate coil corresponding to each of the transmission coils 223 (i.e., first through n-th transmission coils) It should be noted that it may also perform in-band communication with the receiver.

The storage unit 270 stores the input current value of the wireless power transmitter according to the charging state of the wireless power receiver, the charging power intensity, the charging stop state, the temperature of the wireless power transmitter for charging restart, Can be stored. In particular, the storage unit 270 may store the charge control signal and the temperature information received from the wireless power receiver. Also, when short-distance wireless communication is performed with the wireless power receiver and the wireless power transmitter, identifier information for short-range wireless communication can be stored. Therefore, it is possible to match and store the identifier information and the temperature information of the wireless power receiver for the wireless charging suspension or power control corresponding to the identifier information.

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

3, the wireless power receiver 300 includes a receiving coil 310, a rectifier 320, a DC / DC converter 330, a load 340, a sensing unit 350, 360, and a main control unit 370. Here, the communication unit 360 may include at least one of a demodulation unit 361 and a modulation unit 362.

Although the wireless power receiver 300 shown in FIG. 3 is shown as being capable of exchanging information with the wireless power transmitter 200 via in-band communication, this is but one embodiment, and in accordance with another embodiment The communication unit 360 may provide short-distance bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.

AC power received through the receive coil 310 may be delivered to the rectifier 320. The rectifier 320 may convert the AC power to DC power and transmit it to the DC / DC converter 330. The DC / DC converter 330 may convert the intensity of the rectifier output DC power to a specific intensity required by the load 340 and then deliver it to the load 340. Also, the receiving coil 310 may include a plurality of receiving coils (not shown), that is, first through n-th receiving coils. The frequency of the AC power transmitted to each of the reception coils (not shown) according to an embodiment may be different from each other, and another embodiment may include a predetermined frequency controller having a function of adjusting LC resonance characteristics for different reception coils The resonance frequencies of the respective reception coils can be set differently.

The load 340 may be a terminal including a battery or a battery.

The sensing unit 350 may include a current sensor to measure the intensity of the current applied to the receiving coil 310 according to the wireless power receiver and to transmit the measurement result to the main control unit 370. [

The demodulation unit 361 demodulates the AC power signal between the reception coil 310 and the rectifier 320 or the DC power signal output from the rectifier 320 to identify whether the detection signal is received, As shown in FIG. At this time, the main control unit 370 can control the signal strength indicator corresponding to the detection signal to be transmitted through the modulator 362. [

Further, the main control unit 370 may request charging power control or wireless charging stop of the wireless power transmitter 200 according to a charging state based on at least one of the battery charging rate and the battery temperature. More specifically, the main control unit 370 can request the charging power according to the power transmission contract in the first charging state. The intensity of the charging current may depend on the intensity of the charging power. That is, the charging current in the first charging state may be higher than the charging current in the second to fourth charging states. The main control unit 370 may request the wireless power transmitter 200 to lower the charging power in the second charging state. In this case, the charging current may be lower than the charging current in the first charging state. The main control unit 370 may request the wireless power transmitter 200 to stop charging in the third charging state. In this case, the intensity of the charging current may be lowest or not flowing. The main control unit 370 may request the wireless power transmitter 200 to gradually lower the intensity of the charging power in the fourth charging state. In this case, the charging current may be a form in which the charging current is sequentially lowered.

4, the structure of a terminal including a wireless power receiver and a battery will be described in detail and operation characteristics according to an embodiment of the present invention will be described below.

FIG. 4 is a block diagram of a wireless charging terminal including a wireless power receiver to which the present embodiment is applied, FIG. 5 is an exemplary view for explaining a battery charging state of the wireless charging terminal to which the present embodiment is applied, FIG. 1 is an exemplary view illustrating a structure of a battery mounted in a wireless charging terminal to which an embodiment is applied.

4 to 6, the wireless charging terminal 400 according to the present embodiment includes a wireless power receiving unit 410, a battery 420, a power control unit 4300, a terminal control unit 440, and a storage unit 450 .

The wireless power receiving unit 410 may include the configuration of the wireless power receiver 300 described with reference to FIG. In the embodiment of FIG. 4, a wireless power receiver is illustrated as being formed in the wireless charging terminal, but this is not limiting and may be implemented separately separately.

The wireless power receiving unit 410 may perform a function of receiving wireless power from a wireless power transmitter (not shown).

The wireless power receiving unit 410 may transmit a wireless charging control signal to the wireless power transmitting apparatus. Specifically, the wireless power receiving unit 410 can sense the temperature information of the battery 420. FIG. In addition, the wireless power receiving unit 410 can sense a wireless charging stop request signal through the terminal control unit 440. [ That is, the wireless power receiving unit 410 senses the temperature information of the battery 420 and can request the wireless power transmission device to stop wireless charging based on the wireless charging stop request signal detected through the terminal control unit 440 have.

At this time, the wireless power receiving unit 410 may sense the battery temperature information at the time when the wireless charging stop request is generated. Accordingly, the wireless power receiving unit 410 may store the temperature information of the battery 420 corresponding to the wireless charging stop request detected at the initial charging.

After the wireless charging is again performed (in the case of not initial wireless charging), before the wireless charging stop request signal of the terminal control unit 440 is sensed based on the stored temperature information, a wireless charging stop request signal or wireless charging power It is possible to transmit a wireless charging control signal including a steering signal and the like.

For example, it may be desirable to transmit the wireless charging control signal when the stored wireless charging suspension request signal is less than the temperature of the battery 420. That is, it may be desirable to transmit the wireless charging control signal to the wireless power transmission apparatus before the temperature of the battery 420 becomes the temperature at the time when the wireless charging stop occurs and the wireless charging stopping does not occur. However, the present invention is not limited to this, and the wireless power receiving unit 410 may transmit various wireless charging control signals such as a wireless charging suspension request signal or a wireless charging power control signal to the wireless power transmission apparatus based on the result of sensing the temperature of the battery 420 Can be transmitted.

The battery 420 may be charged with power applied through the wireless power receiving unit 410. Also, the battery 420 may be discharged with electric power for driving the wireless charging terminal 400. The battery 420 may be configured to be mounted on the wireless charging terminal 400 as shown in FIG. The disclosed wireless charging terminal 400 includes a bar-shaped terminal body. However, the present embodiment is not limited thereto, and can be applied to various structures such as a watch type, a clip type, a glass type, a folder type in which two or more bodies are movably coupled to each other, a flip type, a slide type, a swing type, have. In addition, the present invention is not limited to a mobile terminal, but may include an electronic device capable of wireless charging and a battery mounted or detached.

The terminal 400 includes an appearance case. As shown, the terminal 400 may include a front case and a rear case. Various electronic components are disposed in the inner space formed by the combination of the front case and the rear case. Among the electronic parts that can be mounted on the rear case, the electronic part may include a battery that is fixedly mounted or detachable. The battery may be coupled to the rear case and configure a rear cover for covering the rear case. Therefore, external exposure of the battery and electronic parts can be blocked.

The battery 420 may constitute four terminals on one side of the battery 420 as shown in the example of FIG. 6 (a) and FIG. 6 (b). Specifically, the first to fourth terminals 421, 422, 423, 424 of the battery 420 may be connected to the terminal 400 and the wireless power receiving unit 410.

Specifically, the first terminal 421 may be a power input terminal 421 to which power applied from the wireless power receiving unit 410 is applied. The power input terminal 421 may be connected to the power supply of the terminal 400 for power supply during wired charging in addition to the wireless power receiving unit 410. That is, the power input terminal 421 can receive and charge the power applied through wireless charging or wire charging.

The second terminal 422 may be a temperature measurement terminal. Specifically, the second terminal 422 is connected to a thermistor R in the battery 420, and the temperature of the battery 420 can be sensed according to the resistance value of the thermistor. In the present embodiment, the temperature measuring means connected to the second terminal 422 is described as a thermistor. However, the present invention is not limited to this, and it is possible to measure the temperature variation of the battery, Device.

The third terminal 423 may be a ground terminal.

The second terminal 422 and the third terminal 423 may be connected to the wireless power receiving unit 410 and the power control unit 430 according to the present embodiment. Specifically, the second terminal 422 and the third terminal 423 are connected to the wireless power receiving unit 410 and the power control unit 430, respectively, and the wireless power receiving unit 410 and the power control unit 430 are connected to each other via the second terminal 422 and the third terminal 423, It is possible to detect the temperature information of the battery 420 during charging.

The fourth terminal 424 may be a battery identifier terminal. More specifically, information that can be used to distinguish whether the battery is registered (usable) when the terminal 400 is mounted through the fourth terminal 424 can be provided.

The power controller 430 connected to the battery 420 can manage the power received by radio or the power received by the wire and the power applied to the wireless power receiver. The power control unit 430 may control the charging by providing power to the battery 420 to charge the battery 420. [ The power control unit 430 may sense the temperature of the battery 420 and provide the sensed temperature information to the terminal control unit 440. Specifically, the power control unit 430 is connected to the second terminal 422 and the third terminal 423 of the battery 420, and can sense the degree of heat generation of the battery 420 during wireless charging. That is, the power control unit 430 can provide the terminal control unit 440 with the temperature information of the battery 420 during the wireless charging.

The terminal control unit 440 can execute the overall operation control of the terminal 400. [ The terminal control unit 440 can acquire temperature information of the battery 420 at the time of wireless charging through the power control unit 430 according to the present embodiment. The terminal control unit 440 can confirm the temperature information of the battery 420 applied through the power control unit 430 based on the temperature information for wireless charging control in the storage unit 450. [ The terminal control unit 440 may output a wireless charging stop request signal to the wireless power receiving unit 410 based on the battery temperature information. That is, the terminal control unit 440 outputs a signal for requesting the wireless charging stop when the temperature reaches the reference temperature (over temperature) due to the temperature rise due to the heat generation of the battery 420 during wireless charging. At this time, the output signal may be a high or low digital signal. For example, it may be a wireless charge retention signal if it is a high signal. If it is a low signal, it may be a wireless charge stop request signal. Accordingly, the wireless power receiving unit 410 may detect a signal received through the terminal control unit 440 and transmit the wireless charging stop request signal to the wireless power transmitting apparatus.

The storage unit 450 may store a program for operation of the terminal 400 or data to be generated. The storage unit 450 may store temperature information of the battery 420 sensed by the wireless power receiving unit 410 according to the present embodiment. In addition, the storage unit 450 may store the temperature at which the terminal control unit 440 transmits the wireless charge stop request signal to the wireless power receiving unit 410 and the temperature information of the battery 420 at that time. That is, the storage unit 450 may store a wireless charging control signal including a wireless charging stop or power control request signal based on the battery temperature and the battery temperature.

Conventionally, the wireless power receiving unit is connected only to the terminal control unit, and is not separately connected to the power control unit and the battery. Therefore, it is limited to directly grasp the battery thermistor information.

According to an embodiment of the present invention, there is an advantage that the wireless power receiving unit is connected to the power control unit and the battery as well as the terminal control unit by utilizing some ports of the battery so that the battery thermistor information can be directly grasped.

The wireless charging operation will be described in detail below based on the configurations of the wireless charging apparatus and the wireless charging terminal described in FIGS. 1 to 6 and the wireless charging system including the same.

7 is a flowchart illustrating an operation of the wireless charging terminal according to an exemplary embodiment of the present invention.

In FIG. 7, the wireless charging terminal operates in a state in which the wireless charging terminal does not store (not recognize) the battery temperature information and the corresponding charging control information during wireless charging.

Referring to FIG. 7, the wireless charging terminal 400 wirelessly receives power from the wireless power transmission device through the wireless power receiving unit 410, and executes a charging mode for charging the battery 420 with the received power (S710)

The wireless power receiving unit 410 and the power control unit 430 can measure the battery temperature to detect the degree of heat generation of the battery 420 during the charging mode operation S720 The wireless power receiving unit 410 and the power control unit 430 can sense the temperature of the battery 420 through the second terminal 422 and the third terminal 423 according to the degree of change of the resistance R in the battery 420.

The wireless power receiving unit 410 and the power control unit 430 continuously detect the temperature of the battery 420 during the charging mode and the wireless power receiving unit 410 receives the wireless charging stop request signal The wireless power receiving unit 410 and the power control unit 430 may sense the temperature of the battery 420 and the power control unit 430 may determine the temperature of the battery 420. [ And provides the terminal control unit 440 with information. The terminal control unit 440 transmits a wireless charging stop request signal to the wireless power receiving unit 410 when the terminal control unit 440 senses an over temperature reference temperature based on the sensed temperature information. At this time, the reference temperature set for overheating is, for example, 41 ° C, but it is not limited thereto. That is, the battery, the wireless power receiver, and the terminal can be set and varied to an optimum temperature that does not have an influence due to overheating and does not affect wireless charging.

The wireless power receiving unit 410 of the terminal 400 checks the temperature of the battery when the wireless charging stopping request signal is received from the terminal control unit 440 when the wireless charging stopping request signal is received. And then transmits the sensed battery temperature and wireless charging stop request signal to the wireless power transmission apparatus (S740)

At this time, the terminal 400 stores the wireless charging suspension request signal transmitted to the wireless power transmission apparatus and the corresponding battery temperature information in the storage unit 450 (S750)

In response to the wireless charging stop request signal transmitted through the wireless power receiving unit 410, the terminal 400 stops the wireless charging mode when the power is stopped from the wireless power transmission apparatus (S760)

That is, the wireless charging terminal 400 checks the temperature information of the battery 420 in the wireless power receiving unit 410 and the power control unit 430 in the wireless charging mode. The power control unit 430 provides battery temperature information to the terminal control unit 440 and the terminal control unit 440 can output a wireless charge weighting request signal to the wireless power receiving unit 410 based on the battery temperature information have.

At this time, the wireless power receiving unit 410 confirms the temperature information of the battery detected upon receiving the wireless charging stop request signal, and provides the wireless charging stop request signal and corresponding battery temperature information to the wireless power transmission apparatus. Therefore, only the battery temperature information can be confirmed at the time of recharging, so that the wireless charging operation due to the overheating can be prevented from being stopped or malfunctioning. .

In particular, when the wireless power transmitter and the wireless charging terminal have a module capable of short distance communication, it is possible to receive and store the short distance communication identifier information together with the wireless charging stop request signal and the corresponding battery temperature information. Therefore, the wireless charging operation according to the short-range communication identifier information and the wireless charging stop information corresponding to the identifier information can be controlled upon charging.

In the present embodiment, the wireless charging stop request signal is transmitted to the wireless power transmission apparatus based on the temperature information detected in the wireless charging mode, for example. However, the present invention is not limited thereto, and it is possible to transmit a power control request signal other than a wireless charge stop request signal. That is, it is possible to transmit a power control request signal for reducing the power transmitted by the wireless power transmission apparatus in order to reduce power transmission errors and malfunctions due to overheating.

8, the operation of the wireless charging device (wireless power transmission device) according to the operation of the wireless charging terminal described with reference to FIG. 7 will be described in detail.

FIG. 8 is a flowchart illustrating an operation of a wireless power transmitter interworking with the wireless charging terminal of FIG. 7 according to an embodiment. In FIG. 8, the wireless charging terminal and the wireless charging terminal of FIG. 7 operate in a state in which the battery temperature information and corresponding charging control information are not stored (recognized) when the wireless charging mode is performed.

8, the wireless power transmitter executes a wireless charging mode in which wireless power is transmitted to a wireless charging terminal sensed in a charging area when the wireless power transmitter operates in a charging mode (S810) (S820)

The wireless power transmitter can receive the temperature information of the battery 420 of the wireless charging terminal 400 and the wireless charging stop request signal from the wireless charging terminal 400 while executing the power transmission to the wireless charging terminal in operation S830. Specifically, the wireless power transmitter transmits the temperature information of the battery 420 detected by the wireless power receiving unit 410 of the wireless charging terminal 400 and the wireless charging stop request signal transmitted from the terminal control unit 440 to the wireless power receiving unit 410 Lt; / RTI > That is, the wireless power transmitter can receive the wireless charging stop request signal and the battery temperature information at the time when the signal is generated, from the wireless power receiving unit 410 of the wireless charging terminal 400.

The wireless power transmitter may store the wireless charging stop information including the wireless charging stop request signal received from the wireless charging terminal 400 and the battery temperature information corresponding thereto (S840). In particular, the wireless power transmitter and the wireless charging terminal In the case of having a module capable of short-range communication, it is possible to receive and store the short-range communication identifier information together with the wireless charging stop information. Therefore, the wireless charging operation according to the short-range communication identifier information and the wireless charging stop information corresponding to the identifier information can be controlled upon charging.

The wireless power transmitter may suspend the power transmission operation to the wireless charging terminal according to the wireless charging suspension request signal received from the wireless charging terminal 400. In operation S850,

In the present embodiment, when the wireless charging stop request signal and the battery temperature information received from the wireless charging terminal are received, the wireless charging is stopped according to the wireless charging stop request signal. However, the present invention is not limited thereto, and it is possible to adjust the transmitted power according to the wireless charging control signal received from the wireless charging terminal, thereby reducing the battery temperature.

Hereinafter, the wireless charging operation performed after the initial wireless charging operation performed in the above-described FIG. 7 and FIG. 8 will be described in detail with reference to FIGS. 9 and 10. FIG.

FIG. 9 is a flowchart illustrating an operation of the wireless charging terminal in the wireless charging mode of FIG. 7 according to an exemplary embodiment of the present invention.

9, the wireless charging terminal 400 receives wireless power from the wireless power transmitter and executes a charging mode for charging the battery 420 with the received power (S910)

The wireless power receiving unit 410 of the wireless charging terminal 400 may sense temperature information of the battery 420 (S920)

The wireless power receiving unit 410 may determine whether the sensed battery temperature is equal to or higher than a reference temperature at step S930. Specifically, the reference temperature is a temperature at which the battery 420 is over- It can be a temperature that can affect. For example, the reference temperature may be, but is not limited to, 41 ° C.

The wireless power receiving unit 410 may transmit a charge stop request signal to the wireless power transmitter when it is determined that the sensed battery temperature is equal to or higher than the reference temperature. Or a power control request signal requesting control of the transmission power in addition to the charge stop request signal.

The wireless power receiving unit 410 may stop the wireless charging when the power transmission from the wireless power transmitter is stopped based on the transmitted charge stop request signal. The battery temperature can then be sensed and the wireless charge can be re-enabled if it is detected below the reference temperature. The execution of the wireless filler may be performed by transmitting a charge restart request signal to the wireless power transmitter.

In the present embodiment, the wireless power receiving unit 410 senses the temperature of the battery 420 and transmits a wireless charging control signal when the temperature of the battery 420 is higher than the reference temperature.

In addition, when the reference temperature is set lower than the overheat temperature, the wireless power control request signal may be transmitted before the wireless charging stop occurs when the battery temperature is detected at the reference temperature.

As described above, in the case where the wireless charging terminal according to the embodiment of FIG. 9 is not the first wireless charging, the wireless charging terminal according to the battery temperature detected based on the time point at which the stored wireless charging stop request signal is generated and the battery temperature corresponding thereto, Signal to the wireless power transmission device. Therefore, it is not required to generate a separate wireless charging stop request signal from the separate terminal control unit and transmit it to the wireless power receiver, thereby reducing the operation load of the wireless charging terminal. In addition, the power control request or the charge stop request is issued before the wireless charging stop due to the battery overheating occurs, so that the wireless charging can be stably executed.

10, the charging operation of the wireless power transmitter in the case where the wireless power transmission apparatus stores the wireless charging control signal and the battery information corresponding thereto during the initial wireless charging will be described in detail.

FIG. 10 is a flowchart of the operation of the wireless power transmitter in wireless charging from FIG. 8 onward according to another embodiment.

10, the wireless power transmitter executes a wireless charging mode in which wireless power is transmitted to a wireless charging terminal sensed in a charging area when the wireless power transmitter operates in a charging mode (S1010)

The wireless power transmitter may receive the temperature information of the battery 420 of the wireless charging terminal 400 from the wireless charging terminal 400 while executing power transmission to the wireless charging terminal. It is possible to receive the battery temperature of the wireless charging terminal transmitted from the wireless power receiving unit of the wireless charging terminal.

At this time, since the wireless power transmitter stores the charging stop request signal and the corresponding battery temperature information in the wireless charging of the pre-stored wireless charging receiver, the received battery temperature and the pre-stored battery temperature are compared (S1030)

The wireless power transmitter compares the pre-stored reference battery temperature with the received battery temperature and ends the running wireless charging mode based on the result. Specifically, the wireless power transmitter compares the received battery temperature with a reference temperature set to a temperature of a battery in which wireless charging is suspended during a pre-stored wireless charging. Thereafter, when the received battery temperature is lower than the pre-stored reference temperature, the wireless charging can be maintained according to the comparison result. However, if it is determined that the battery temperature is equal to or higher than the received battery temperature, the ongoing wireless charging may be stopped. That is, when the temperature of the battery approaches the reference range or enters the critical range, a wireless charging stop state may occur due to battery overheating. Accordingly, in order to prevent the abnormal wireless charging stop state, if the battery temperature is close to the reference temperature, the wireless power transmitter may stop the wireless power transmission.

In the present embodiment, the wireless power transmitter has been described by way of example to compare with the reference temperature based on the temperature of the battery received from the wireless power receiver, and stop the wireless charging according to the result. However, if the temperature of the battery is more than the reference temperature or the temperature of the battery is within the critical range of the reference temperature, it is possible to perform control such as reducing power transmitted without stopping wireless charging.

Alternatively, the reference temperature may be set to a temperature before the wireless charging is stopped without setting the wireless charging to a stopped temperature, and the transmission power may be controlled when the reference temperature is detected. In this case, the wireless power transmitter controls the transmission power before the battery is overheated, so that stable power transmission and wireless charging can be performed.

Hereinafter, a case where the wireless charging mode is executed through short-range communication authentication between the wireless power transmitter and the wireless charging terminal will be described in detail with reference to FIG. 11.

11 is a flow diagram illustrating the operation of a wireless charging system including a wireless power transmitter and a wireless charging terminal in accordance with another embodiment.

Referring to FIG. 11, a wireless charging system according to the present embodiment includes a wireless power transmitter 1100 and a wireless charging terminal 1200 that wirelessly receives power from the wireless power transmitter 1100.

The wireless power transmitter 1100 and the wireless charging terminal 1200 according to another embodiment may perform the malicious authentication operation before the wireless charging mode operation by the short-range wireless communication antenna, respectively. That is, it is possible to confirm whether the transmitter and the receiver are wirelessly rechargeable through the mutual authentication using the short-distance wireless communication, the charge control signal, and the like.

Specifically, the wireless power transmitter 1100 and the wireless charging terminal 1200 can perform an authentication operation according to short-range wireless communication when the wireless charging terminal 1200 is detected in the wireless charging area of the wireless power transmitter 1100 (S1102)

The wireless power transmitter 1100 can determine whether the charging information received at the previous wireless charging is present from the wireless charging terminal 1200 when the local communication authentication operation with the wireless charging terminal 1200 is completed at step S1102. The charging information may include information on the battery temperature during the wireless charging, the charging stop request signal information corresponding to the temperature information, and the like stored in the wireless charging terminal 1200 and the previous wireless charging operation.

When the wireless power transmitter 1100 confirms that the charging information of the wireless charging terminal 1200 has been stored, the wireless power transmitter 1100 can perform a wireless charging mode in which wireless power is transmitted to the wireless charging terminal 1200 (S1108 )

The wireless power transmitter 1100 may receive the temperature information of the battery from the wireless charging terminal 1200 during the wireless charging mode. (S1110) At this time, the wireless power transmitter 1100 receives the battery temperature Wireless charging stop request signal in addition to the information. That is, the wireless power transmitter 1100 may receive the temperature of the battery and the wireless charging stop request signal from the wireless charging terminal 1200 during the wireless charging mode, respectively.

The battery temperature and the type of the wireless charging stop request signal received from the wireless power transmitter 1200 by the wireless power transmitter 1100 will be described in detail with reference to the drawings.

FIG. 12 is a diagram for explaining a packet format according to a wireless power transmission procedure, and FIG. 13 is a diagram for explaining a wireless charge suspension request signal packet in the packet format.

12 and 13, a packet format 1200 used for information exchange between a wireless power transmitter and a wireless power receiver includes a preamble (hereinafter referred to as " preamble " A header 1220 for identifying the type of the message included in the packet, a message 1230 for transmitting the content of the packet (or payload) And a checksum (1240) field for identifying whether an error has occurred in the packet.

As shown in FIG. 12, the packet receiver may identify the size of the message 1230 contained in the packet based on the header 1220 value.

In addition, the header 1220 can be defined for each step of the wireless power transmission procedure. For example, the header value corresponding to the power transmission end in the power transmission step may be defined as 0x02. The header value corresponding to the battery temperature information in the power transmission step may be defined as 0x18. At this time, the header value corresponding to the battery temperature information is not defined as being limited to 0x18, and may be defined by varying the header value that is not defined in the packet format. Also, the size of the message can be varied according to the variable header value. That is, in the present embodiment, the header value corresponding to the battery temperature information is 0x18 and the corresponding message size is defined as 1. In addition, the packet type is defined as a proprietary header value (for example, 0x19, 0x38, 0x48, etc.) and the corresponding message size.

The message 1230 includes data to be transmitted at the transmitter of the packet. For example, the data included in the message 1230 field may be, but is not limited to, a report, a request, or a response to the other party.

The packet 1200 according to another embodiment 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 to receive 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. However, the present invention is not limited thereto, and information that can distinguish the receiver and the transmitter on the wireless charging system is sufficient.

The packet 1200 according to another embodiment may further include predetermined group identification information for identifying a corresponding receiving group when the packet is to be received by a plurality of apparatuses.

13 is a diagram for explaining a wireless charge stop request signal packet in the packet format.

Referring to FIG. 13, the message format of the power transmission interruption packet according to an embodiment may include an end power transfer code having a size of 1 byte.

The reasons why the wireless power receiving apparatus requests the wireless power transmitter to stop the power transmission include charging completion, internal fault, overtemperature, overvoltage, overcurrent, battery And may include battery failure, reconfiguration, and no response. Especially, in the case of overheating, it can be used when the measured temperature value at the receiver exceeds the defined threshold for each. As described above, the power transmission interruption code is not limited thereto, but may be additionally defined corresponding to each new power transmission interruption reason.

Meanwhile, the wireless power transmitter 1100 may check the battery temperature information received from the wireless charging terminal 1200 during the wireless charging mode, and determine whether the received battery temperature is equal to or higher than a predetermined reference temperature. At this time, the reference temperature may be a battery temperature at which the wireless charging stop request signal previously stored in the wireless charging terminal 1200 and the previous wireless charging mode is generated. Alternatively, the reference temperature may be a temperature below the critical range from the battery temperature at which the wireless charging stop request signal previously stored in the wireless charging terminal 1200 and the previous wireless charging mode is generated.

The wireless power transmitter 1100 may suspend or transmit the power that was being transmitted wirelessly when the temperature of the battery received from the wireless charging terminal 1200 is higher than the reference temperature.

Meanwhile, the wireless power transmitter 1100 can request the previously stored charging information from the wireless charging terminal 1200 when the stored charging information of the authenticated wireless charging terminal 1200 does not exist after the short-range communication is authenticated (S1104)

The wireless charging terminal 1200 may transmit the stored charging information to the wireless power transmitter 1100 when there is stored charging information at the time of the previous charging (S1107)

On the other hand, the wireless charging terminal 1200 can transmit the charging information unconfirmed notification signal if there is no stored charging information at the time of the previous charging (S1106)

The wireless charging terminal 1200 can then receive power from the wireless power transmitter 1100 to charge the battery.

The wireless charging terminal 1200 may transmit battery temperature information to the wireless power transmitter 1100 during a wireless charging operation. Thereafter, the wireless power transmitter 1100 can receive the battery temperature and the charge stop request signal received from the wireless charging terminal 1200 when the charging information is not received from the wireless charging terminal 1200. Then, the wireless power transmitter 1100 may stop the wireless charging operation according to the wireless charging stop request signal received from the wireless charging terminal 1200 (S1112)

The wireless power transmitter 1100 also performs a wireless charging operation based on the received charging information when the charging information received in response to the charging information request from the wireless charging terminal 1200, The charging operation can be controlled.

As described above, the wireless charging terminal and the wireless power transmitter of the wireless charging system according to another embodiment check the pre-stored charging information through short-range communication authentication, and the wireless power transmitter transmits wireless charging information . Accordingly, it is possible to control the wireless charging operation before the overheated temperature by sensing the battery temperature of the wireless charging terminal during wireless charging.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (17)

A wireless power receiver for receiving power from a wireless power transmitter;
A battery charged with the received power;
A power control unit for controlling the charging of the battery and sensing temperature information of the battery upon charging;
And a terminal control unit for receiving the battery temperature information from the power control unit and outputting a charge control signal of the battery based on the temperature information,
The wireless power receiver
Sensing the battery temperature information,
And transmits the battery temperature information and the charge control signal received from the terminal control unit to the wireless power transmitter. The method according to claim 1,
The terminal control unit
And transmits the charge control signal to the wireless power receiving unit when the temperature of the battery is detected to be higher than a predetermined temperature based on temperature information received from the power control unit. 3. The method of claim 2,
Wherein the charge control signal is a wireless charge stop request signal. 3. The method of claim 2,
Wherein the charging control signal is a wireless charging transmission power variable signal. The method according to claim 1,
The battery
Power input terminal;
Temperature measurement terminal;
And a ground terminal,
The wireless power receiving unit and the power control unit
And a temperature measuring terminal and a ground terminal of the battery. 6. The method of claim 5,
And a thermistor is connected to the temperature measurement terminal of the battery. The method according to claim 1,
And a storage unit for storing the charge control signal of the battery and the battery temperature information corresponding to the charge control signal. 8. The method of claim 7,
The charge control signal and battery temperature information stored in the storage unit
And a charging stop request signal or a charging power variable signal according to the battery temperature information. 9. The method of claim 8,
The wireless power receiver
And outputs a charge stop request or a power variable signal when the temperature of the battery is higher than a reference temperature. The method according to claim 1,
The wireless power receiver
And for varying the charging power according to the battery temperature information and the power supplied from the wireless power transmission unit based on the charging control signal. A power transmitting section including at least one transmitting coil and a driving section for controlling output power provided to at least one transmitting coil;
A control unit for controlling the output power corresponding to the battery temperature information and the charge control signal received from the wireless charging terminal;
And a storage unit for storing battery temperature information received from the wireless charging terminal and a charging control signal corresponding thereto,
The control unit
And controls charging power based on battery temperature information received from the wireless charging terminal upon wireless charging. 12. The method of claim 11,
And stops power transmission or changes power according to the battery temperature information. A wireless power transmitter for transmitting power to a wireless power receiver
And a wireless charging terminal for receiving power from the wireless power transmitter, charging the battery with the received power, and transmitting temperature information and charging control information of the battery to the wireless power transmitter when charging the battery,
The wireless power transmitter
Storing temperature information and charge control information received from the wireless charging terminal,
A wireless charging system for controlling the charging power based on temperature information received from the wireless charging terminal during wireless power transmission; 14. The method of claim 13,
The wireless charging terminal
A wireless power receiver for receiving power from a wireless power transmitter;
A battery charged with the received power;
A power control unit for controlling the charging of the battery and sensing battery temperature information during charging;
And a terminal control unit for receiving the battery temperature information from the power source control unit and outputting the battery charge control signal based on the temperature information,
The wireless power receiver
Sensing the battery temperature information,
And transmits the battery temperature information and a charge control signal received from the controller to the wireless power transmitter. 14. The method of claim 13,
The wireless power transmitter
Wherein the control unit checks temperature information received from the wireless charging terminal during the wireless power transmission,
And the charging control unit controls the charging power by confirming a pre-stored charging control signal corresponding to the confirmed temperature information. 16. The method of claim 15,
Wherein the charge control signal is a charge stop or charge power variable signal. 14. The method of claim 13,
Wherein the wireless power transmitter and the wireless charging terminal each include a short distance communication module,
Wherein the wireless power transmitter senses temperature information and a charge control signal of the wireless charging terminal based on authentication information authenticated by the local communication module.

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