KR20140074178A - Apparatus and method for wireless charge - Google Patents

Abstract

The embodiment of the present invention relates to a wireless charging method which includes the steps of: receiving necessary power from a second wireless power receiver when power is supplied to at least one first wireless power receiver; calculating the necessary power of the total wireless power receivers including at least one first wireless power receiver and at least one second wireless power receiver; and transmitting insufficient power information to the total wireless power receivers if the maximum power to be provided is not greater than the necessary power of the total wireless power receivers.

Description

[0001] APPARATUS AND METHOD FOR WIRELESS CHARGE [0002]

Embodiments of the invention relate to wireless charging technology.

A mobile terminal such as a mobile phone or a personal digital assistant (PDA) is driven by a rechargeable battery. In order to charge the battery, a separate charging device is used to supply electric energy to the battery of the mobile terminal. Typically, the charging device and the battery are each provided with a separate contact terminal on the outside thereof, thereby electrically connecting the charging device and the battery by making them contact each other.

However, in such a contact type charging method, since the contact terminal protrudes to the outside, contamination by foreign matter is easy and the battery charging is not properly performed. Also, even if the contact terminals are exposed to moisture, charging is not properly performed.

In order to solve these problems, wireless charging or non-contact charging technology has recently been developed and used in many electronic devices.

Such a wireless charging technique uses wireless power transmission and reception, and is a system in which a battery can be charged automatically, for example, simply by placing a cellular phone on a charging pad without connection by a separate charging connector. Generally, the wireless charging technique is applied to a wireless electric toothbrush or a wireless electric shaver, and is known to the general public. Such wireless charging technology can enhance the waterproof function by charging the electronic products wirelessly, and it is advantageous to increase the portability of the electronic devices since the wired charger is not required, and the related technology is expected to greatly develop in the upcoming electric car era .

Such wireless charging techniques include an electromagnetic induction method using a coil, a resonance method using a resonance (Resonance), and a radio frequency (RF / Micro Wave Radiation) method of converting electrical energy into a microwave.

Currently, electromagnetic induction is the main method. However, in recent years, experiments have been successfully conducted to transmit electric power wirelessly from a distance of several tens of meters using microwaves at home and abroad. In the near future, The world seems to be opened.

The power transmission method by electromagnetic induction is a method of transmitting power between the primary coil and the secondary coil. When a magnet is moved to a coil, an induced current is generated, which generates a magnetic field at the transmitting end and induces a current according to the change of the magnetic field at the receiving end to generate energy. This phenomenon is called magnetic induction phenomenon, and the power transmission method using the phenomenon is excellent in energy transmission efficiency.

The resonance method was announced in 2005 as "Coupled Mode Theory" by MIT's "Soljacic" professor and is a system in which electricity is transmitted wirelessly, even at distances of a few meters (m) away from the charging device using the resonant power transmission principle. The MIT team's wireless charging system uses a physics concept that resonates with the resonance (resoNaNce) of a tuning fork and the wine cellar next to it rings at the same frequency. Instead of resonating the sound, the researchers resonated electromagnetic waves that contained electrical energy. The resonant electrical energy is transmitted directly only when there is a device with a resonant frequency, and unused portions are not re-absorbed into the air, but are reabsorbed into the electromagnetic field. Therefore, unlike other electromagnetic waves, they will not affect the surrounding machine or body .

For example, when the above-described wireless power transmission technique is used in a wireless charging system, the wireless charging system may comprise a wireless power transmitter for transmitting power and a wireless power receiver for receiving power to charge the battery have. The wireless power transmitter transmits the power required for charging to supply power to the object. The wireless power receiver can perform charging using the transmitted power. In recent years, a multi-charging system has been developed and used in which a plurality of wireless power receivers receive and charge electric power from a single wireless power transmitter.

However, in the case of the existing wireless charging system, the amount of power required varies depending on the quantity of the wireless power receiver. However, since the amount of power supplied from the wireless power transmitter is fixed to a constant amount of power, efficient power supply is not provided.

For example, the wireless power transmitter of the conventional wireless charging system has a problem that efficient power supply is not provided when the transmission maximum power is determined by using the single antenna TA.

Also, if the wireless power transmitter uses the Power Tracking function, it can not change the maximum power of the wireless power transmitter, which can cause problems if the number of wireless power receivers increases.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a wireless charging apparatus and method capable of efficient charging even when the number of wireless power receivers is increased.

According to an embodiment of the present invention, there is provided a wireless charging method comprising: receiving power required from a second wireless power receiver during powering on at least one first wireless power receiver; Calculating a required power of all wireless power receivers including a first wireless power receiver and a second wireless power receiver if the maximum available power is not greater than the required power of all the wireless power receivers; Process.

According to another aspect of the present invention, there is provided a wireless charging method, comprising: transmitting a required power to a wireless power transmitter; receiving a power amount information that is insufficient from the wireless power transmitter; And varying the charging current value using the charging current value.

According to another embodiment of the present invention, there is provided a wireless power transmitter comprising: a power transmitter for transmitting wireless power; a communication unit for receiving power required from a second wireless power receiver during power transmission to at least one or more first wireless power receivers; Calculating a required power of all wireless power receivers including at least one or more first wireless power receivers and a second wireless power receiver, And control to transmit to each of the entire wireless power receivers.

According to another embodiment of the present invention, there is provided a wireless power receiver comprising: a power receiver for receiving power from a wireless power transmitter to perform power charging; a communication unit for performing transmission and reception of the wireless power transmitter; And a control unit for controlling the charging current value of the power receiving unit to be varied using the insufficient amount of power information when the insufficient amount of power information is received from the wireless power transmitter.

According to the embodiment of the present invention, when the wireless power transmitter transmits power to a plurality of wireless power receivers to perform charging, efficiency of wireless charging can be improved.

According to an embodiment of the present invention, when the wireless power transmitter is to provide additional power to a new wireless power receiver while supplying power to a plurality of wireless power receivers, it is possible to provide efficient power supply.

1 is a conceptual diagram of a wireless charging system according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a general operation of a wireless charging system according to an embodiment of the present invention.
3 is a block diagram of a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.
4 is a detailed block diagram of a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.
5 is a flowchart illustrating an operation of a wireless power transmitter according to an exemplary embodiment of the present invention.
6 is a flowchart illustrating an operation of a wireless power receiver according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. It is to be noted that the same components in the drawings are denoted by the same reference numerals whenever possible. In the following description and drawings, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unnecessarily obscure.

1 is a conceptual diagram of a wireless charging system according to an embodiment of the present invention. 1, the wireless charging system may include a wireless power transmitter 100 and at least one wireless power receiver 110-1, 110-2, ..., 110-N, 110-N + 1. have.

The wireless power transmitter 100 wirelessly transmits power (1-1, 1-2, ..., N-1) to at least one wireless power receiver (110-1, 110-2, ..., 110- 1-N, 1-N + 1). More specifically, the wireless power transmitter 100 wirelessly transmits power (1-1, 1-2, ..., 1-N, 1-N + 1) to an authenticated wireless power receiver that has performed a predetermined authentication procedure. Can be transmitted.

The wireless power transmitter 100 may form an electrical connection with the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N + 1. For example, the wireless power transmitter 100 may transmit wireless power in the form of electromagnetic waves to the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N + 1.

Meanwhile, the wireless power transmitter 100 may perform bidirectional communication with the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N + 1. Here, the wireless power transmitter 100 and the wireless power receivers 110-1, 110-2, ..., 110-N, and 110-N + 1 are packets 2-1, 2-2, ..., , 2-N, 2-N + 1). The wireless power receiver may be implemented as a mobile communication terminal, a PDA, a PMP, a smart phone, or the like.

The wireless power transmitter 100 may provide power wirelessly to a plurality of wireless power receivers 110-1, 110-2, ..., 110-N, 110-N + 1. For example, the wireless power transmitter 100 may transmit power to a plurality of wireless power receivers 110-1, 110-2, ..., 110-N, 110-N + 1 through a resonance method. The distance between the wireless power transmitter 100 and the plurality of wireless power receivers 110-1, 110-2, ..., 110-N, 110-N + 1 is preferably Can be less than 30m. In addition, when the wireless power transmitter 100 adopts the electromagnetic induction method, the wireless power transmitter 100 and the plurality of wireless power receivers 110-1, 110-2, ..., 110-N, and 110-N + The distance may preferably be 10 cm or less.

The wireless power receivers 110-1, 110-2, ..., 110-N, and 110-N + 1 may receive wireless power from the wireless power transmitter 100 to perform charging of the battery included therein. Further, the wireless power receivers 110-1, 110-2, ..., 110-N, and 110-N + 1 may transmit signals requesting wireless power transmission, information required for wireless power reception, wireless power receiver status information, Transmitter 100 control information or the like to the wireless power transmitter 100. [

Also, the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N + 1 may send a message to the wireless power transmitter 100 indicating the respective charging status.

The wireless power transmitter 100 may include display means such as a display and may be based on messages received from each of the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N + The status of each of the wireless power receivers 110-1, 110-2, ..., 110-N, and 110-N + 1 may be displayed. In addition, the wireless power transmitter 100 may display together the time that each wireless power receiver 110-1, 110-2, ..., 110-N, 110-N + 1 is expected to complete charging .

The wireless power transmitter 100 may also transmit a control signal to disable the wireless charging function in each of the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N + 1 have. The wireless power receiver that receives the disable control signal of the wireless charging function from the wireless power transmitter 100 may disable the wireless charging function.

According to the embodiment of the present invention, the amount of power required according to the number of wireless power receivers in the wireless charging system as described above may be variable. On the other hand, if the amount of power supplied to each of the wireless power receivers in the wireless power transmitter 100 is fixed to a constant amount of power, efficient power supply may not be provided. For example, if the wireless power transmitter 100 is configured to supply power to a maximum of N wireless power receivers 110-1, 110-2, ..., 110-N with a constant amount of power, The N + 1th wireless power receiver 110-N + 1 may not be able to supply power when there is a charging request from the wireless power receiver 110-N + 1.

Accordingly, in an embodiment of the present invention, while the wireless power transmitter 100 is supplying power to the N wireless power receivers 110-1, 110-2, ..., 110-N, an additional new wireless power receiver 110- N + 1) to the new wireless power receiver 110-N + 1 by adjusting the amount of power supplied to each of the N wireless power receivers 110-1, 110-2, ..., 110- And to provide a wireless charging apparatus and method capable of supplying power.

FIG. 2 is a flowchart illustrating an overall operation of a wireless charging system according to an embodiment of the present invention. 2, the wireless power transmitter 100 transmits a new wireless power receiver 110-N + 1 at 204 operation during charging of N wireless power receivers 110-1 through 110-N (RX) (New RX) is added, the power required by the new wireless power receiver 110-N + 1 (New RX) at 206 operation may be transmitted to the wireless power transmitter 100 (Power TX).

The wireless power transmitter 100 determines whether the maximum power TX max Power that can be provided at operation 208 is greater than the required power of the N + 1 wireless power receivers 110-1 through 110-N + 1 .

The wireless power transmitter 100 may determine that the maximum power TX max Power that can be provided is greater than the required power (N + 1 Power amount) of the N + 1 wireless power receivers 110-1 through 110- , It is possible to increase the transmit power (TX Power) in accordance with the required power of N + 1 radio power receivers 110-1 to 110-N + 1 in operation 210. Accordingly, N + 1 wireless power receivers 110-1 through 110-N + 1 can receive power to perform charging in operation 212 of the N + 1 wireless power receiver.

On the other hand, if the maximum power (TX max Power) that the wireless power transmitter 100 can provide is not greater than the required power of the N + 1 wireless power receivers 110-1 through 110-N + 1, And may report an insufficient amount of power to all of the wireless power receivers, e.g., N + 1 wireless power receivers 110-1 to 110-N + 1.

The N + 1 wireless power receivers 110-1 to 110-N + 1 can vary the charging current value of the Rx Charger in accordance with the insufficient amount of power in the 224 operation. And N + 1 wireless power receivers 110-1 through 110-N + 1 may transmit the required amount of power to the wireless power transmitter 100 according to the respective variable charging power values at 226 operation.

The wireless power transmitter 100 determines that the maximum power (TX max Power) that can be provided in operation 228 is less than the required power (the varying required power) of the N + 1 wireless power receivers 110-1 through 110- It is possible to judge whether or not it is larger than a predetermined value.

If the maximum power (TX max Power) that the wireless power transmitter 100 can provide is greater than the required power (the variable required power) of the N + 1 wireless power receivers 110-1 through 110-N + 1, It is possible to increase the transmit power (TX Power) in accordance with the required power (variable required power) of N + 1 radio power receivers 110-1 to 110-N + 1 in operation. Accordingly, N + 1 wireless power receivers 110-1 through 110-N + 1 may receive power from wireless power transmitter 100 in 232 operation to perform charging.

Meanwhile, the wireless power transmitter 100 can determine whether or not the maximum power TX max Power to be provided is higher than the required power (the variable required power) of the N + 1 wireless power receivers 110-1 to 110-N + If not, the operation returns to operation 222 to notify all of the radio power receivers, for example, N + 1 radio power receivers 110-1 to 110-N + 1 of the insufficient amount of power, and the maximum power (TX max Power) It is possible to repeatedly perform operations 222 to 228 until it is larger than the required power (variable required power) of N + 1 radio power receivers 110-1 to 110-N + 1.

In the wireless charging system according to this embodiment of the present invention, the wireless power transmitter 100 adds to the new power receiver 110-N + 1 while supplying power to the N power receivers 110-1 to 110-N It is possible to provide an efficient power supply.

Hereinafter, a configuration of a wireless power transmitter and a wireless power receiver in a wireless charging system according to an embodiment of the present invention will be described in more detail.

3 is a block diagram of a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.

Referring to FIG. 3, the wireless power transmitter 300 may include a power transmitter 311, a controller 312, and a communication unit 313. The wireless power receiver 350 may also include a power receiver 351, a controller 352, and a communication unit 353.

The power transmitter 311 may provide the power required by the wireless power transmitter 300 and may provide power to the wireless power receiver 350 wirelessly. Here, the power transmitter 311 may supply power in the form of an AC waveform, and may supply power in the form of a DC waveform while converting it into an AC waveform using an inverter to supply the AC waveform in the form of an AC waveform. The power transmitting unit 311 may be implemented in the form of a built-in battery, or may be implemented in the form of a power receiving interface to receive power from the outside and supply the power to other components. Those skilled in the art will readily understand that the power transmitter 311 is not limited as long as it is capable of providing a constant AC waveform power.

In addition, the power transmitter 311 may provide the AC waveform to the wireless power receiver 350 in the form of an electromagnetic wave. The power transmitting unit 311 may further include a resonant circuit, and thus can transmit or receive a predetermined electromagnetic wave. When the power transmitting section 311 is implemented as a resonant circuit, the inductance L of the loop coil of the resonant circuit may be changeable. Those skilled in the art will readily understand that the power transmitter 311 is not limited as long as it can transmit and receive electromagnetic waves.

The control unit 312 may control the overall operation of the wireless power transmitter 300. [ The control unit 312 can control the overall operation of the wireless power transmitter 300 using an algorithm, a program, or an application required for the control read from the storage unit (not shown). The control unit 312 may be implemented in the form of a CPU, a microprocessor, or a mini computer.

For example, when the controller 312 receives the required power from the new radio power receiver N + 1 while supplying power to at least one of the radio power receivers N, Lt; RTI ID = 0.0 > (N + 1). ≪ / RTI > At this time, if the maximum power that can be provided is greater than the required power of the entire wireless power receiver, the controller 312 can control to transmit the power according to the required power of the entire wireless power receiver. Also, the controller 312 can control to transmit the insufficient amount of power information to each of all the wireless power receivers unless the maximum power that can be supplied is greater than the required power of the entire wireless power receiver. The control unit 312 can control to transmit the power according to the variable required power of each of the entire wireless power receivers when the variable power required from each of the wireless power receivers is received according to the insufficient amount of power information.

The communication unit 313 can communicate with the wireless power receiver 350 in a predetermined manner. The communication unit 313 communicates with the communication unit 353 of the wireless power receiver 350 using a near field communication network (NFC), a Zigbee communication, an infrared communication, a visible light communication, a Bluetooth communication, a BLE (bluetooth low energy) Can be performed. The communication unit 313 may use the CSMA / CA algorithm. Meanwhile, the above-described communication method is merely an example, and the embodiments of the present invention are not limited to the specific communication method performed by the communication unit 313.

On the other hand, the communication unit 313 can transmit a signal for the information of the wireless power transmitter 300. [ Here, the communication unit 313 can unicast, multicast, or broadcast the signal.

Further, the communication unit 313 can receive the necessary power information or the variable required power information from the wireless power receiver 350. [ Here, the power information may include at least one of a charging current value, a capacity, a battery remaining amount, a charging count, an amount of use, a battery capacity, and a battery ratio of the wireless power receiver 350.

The communication unit 313 can also transmit a charging function control signal for controlling the charging function of the wireless power receiver 350. [ The charging function control signal may be a control signal that controls the wireless power receiving unit 351 of the specific wireless power receiver 350 to enable or disable the charging function.

The communication unit 313 may receive not only the wireless power receiver 350 but also signals from other wireless power transmitters (not shown). For example, the communication unit 313 may receive a Notice signal from another wireless power transmitter.

3, although the power transmitting unit 311 and the communication unit 313 are configured with different hardware and the wireless power transmitter 300 is shown as being communicated in the out-baNd format, this is an example. The power transmitter 311 and the communication unit 313 may be implemented in one hardware so that the wireless power transmitter 300 may perform communication in an iN-baNd format.

The wireless power transmitter 300 and the wireless power receiver 350 are capable of transmitting and receiving various signals such that the subscription of the wireless power receiver 350 to the wireless power network hosted by the wireless power transmitter 300, Can be performed.

4 is a detailed block diagram of a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.

4, the wireless power transmitter 300 may include a power transmission unit 311, a control unit and communication units 312 and 313, a driving unit 314, an amplification unit 315, and a matching unit 316 have. The wireless power receiver 350 includes a power receiving unit 351, a control unit and communication units 352 and 353, a rectifying unit 354, a DC / DC converter unit 355, a switch unit 356, and a load unit 357 .

The driving unit 314 can output DC power having a preset voltage value. The voltage value of the DC power output from the driving unit 314 can be controlled by the control unit and the communication unit 312 or 313.

The direct current output from the driving unit 314 may be output to the amplifying unit 315. The amplifying unit 315 can amplify the direct current with a predetermined gain. In addition, the DC power may be converted into an AC based on a signal input from the control unit and the communication units 312 and 313. [ Accordingly, the amplifying unit 315 can output AC power.

The matching unit 316 may perform impedance matching. For example, the impedance viewed from the matching unit 316 can be adjusted to control the output power to be high efficiency or high output. The matching unit 316 can adjust the impedance based on the control of the control unit and the communication units 312 and 313. The matching unit 316 may include at least one of a coil and a capacitor. The control unit and the communication units 312 and 313 can control the connection state of at least one of the coils and the capacitors, thereby performing the impedance matching.

The power transmitting section 311 can transmit the inputted AC power to the power receiving section 351. The power transmission unit 311 and the power reception unit 351 may be implemented by a resonance circuit having the same resonance frequency. For example, the resonant frequency can be determined to be 6.78 MHz. The power receiving section 351 can receive the charging power.

The control unit and the communication units 312 and 313 can communicate with the control unit and the communication units 352 and 353 on the side of the wireless power receiver 350 and can communicate with each other via a communication system such as WiFi, ZigBee, BT / ) Can be performed.

For example, the control unit 352 can control to transmit necessary power to the wireless power transmitter 300. [ The control unit 352 can perform the control necessary for receiving the charging power transmitted from the power transmitter 300 and performing charging. The control unit 352 can also control the charging current value of the charging unit (Rx Charger) to be varied using the insufficient amount of power information when the insufficient amount of power information is received from the wireless power transmitter 300. (For example, You can control to lower the value to a lower value). The control unit 352 can control the variable power required for the variable charging current value to be transmitted to the wireless power transmitter 300.

The rectifying unit 354 rectifies the radio power received by the power receiving unit 351 in a DC form, and may be implemented, for example, in the form of a bridge diode. The DC / DC converter unit 355 can convert the rectified power to a predetermined gain. For example, the DC / DC converter unit 355 can convert the rectified power so that the voltage of the output terminal 359 is 5V. On the other hand, the minimum value and the maximum value of the voltage that can be applied to the front end 358 of the DC / DC converter 355 can be preset.

The switch unit 356 can connect the DC / DC converter unit 355 and the rod unit 357. The switch unit 356 can maintain the ON state / OFF state under the control of the control unit 352. [ The load section 357 can store the converted power inputted from the DC / DC converter section 355 when the switch section 356 is in the ON state.

Hereinafter, the operation of the wireless power transmitter 300 and the wireless power receiver 350 constructed as described above will be described by way of example.

5 is a flowchart illustrating an operation of the wireless power transmitter 300 according to an embodiment of the present invention. Referring to FIG. 5, the wireless power transmitter 300 may receive the required power from the new wireless power receiver N + 1 while powering at least one or more wireless power receivers N in 510 operation.

The wireless power transmitter 300 may receive at least one of the wireless power receivers N from the new wireless power receiver N + The required power of the entire wireless power receiver including the wireless power receiver (N + 1) can be calculated.

The wireless power transmitter 300 may determine whether the maximum power that can be provided in operation 530 is greater than the required power of the entire wireless power receiver.

If the maximum power that can be provided is greater than the required power of the entire wireless power receiver, the wireless power transmitter 300 may transmit power in accordance with the required power of the entire wireless power receiver at 540 operation.

If the maximum power that can be provided is not greater than the required power of the entire wireless power receiver, the wireless power transmitter 300 may transmit insufficient amount of power information to each of the total wireless power receivers in operation 550. [

Each of the entire wireless power receivers can vary the charging current value of the charging unit (Rx Charger) (for example, the charging current value can be lowered to a low value) using the insufficient amount of power information. And each of the entire wireless power receivers can transmit the variable required power according to the variable charging current value to the wireless power transmitter 300 again.

The wireless power transmitter 300 may receive the varying required power from each of the entire wireless power receivers and transmit power to each of the entire wireless power receivers.

6 is a flowchart illustrating an operation of the wireless power receiver 350 according to an embodiment of the present invention. Referring to FIG. 6, the wireless power receiver 350 may transmit the necessary power to the wireless power transmitter 300 in operation 610.

The wireless power receiver 350 may determine if insufficient power information is received from the wireless power transmitter 300 at 620 operation.

The wireless power receiver 350 may vary the charging current value of the charging unit (Rx Charger) using the insufficient amount of power information in operation 630 when the insufficient amount of power information is received from the wireless power transmitter 300 (for example, Value can be lowered to a lower value). And the wireless power receiver 350 may transmit the variable required power according to the variable charging current value to the wireless power transmitter 300. [

The wireless power receiver 350 may receive power transmitted from the wireless power transmitter 300 at 640 operation to perform charging if the missing power amount information from the wireless power transmitter 300 is not received.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It goes without saying that the example can be variously changed. Accordingly, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (12)

In a wireless charging method,
Receiving required power from a second wireless power receiver during powering on at least one first wireless power receiver,
Calculating a required power of all wireless power receivers including the at least one first wireless power receiver and the second wireless power receiver,
And transmitting the insufficient amount of power information to each of the entire wireless power receivers if the maximum power that can be provided is not greater than the required power of all the wireless power receivers.
The method according to claim 1,
Further comprising the step of transmitting power to each of the entire wireless power receivers according to the required power of the entire wireless power receivers if the maximum power that can be provided is greater than the required power of the entire wireless power receivers.
The method according to claim 1,
Receiving variable power required from each of all the wireless power receivers according to the insufficient amount of power information,
And transmitting power to each of the entire wireless power receivers according to the variable required power.
In a wireless charging method,
Transmitting the required power to the wireless power transmitter,
A step of receiving insufficient amount of power information from the wireless power transmitter,
And varying the charge current value using the insufficient amount of power information.
5. The method of claim 4,
And transmitting the variable required power according to the variable charging current value to the wireless power transmitter.
6. The method of claim 5,
Further comprising the step of receiving the power received from the wireless power transmitter according to the variable required power to perform charging.
In a wireless power transmitter,
A power transmitter for transmitting wireless power,
A communication unit for receiving power required from a second wireless power receiver during power transmission to at least one or more first wireless power receivers,
Calculating a required power of all wireless power receivers including the at least one first wireless power receiver and the second wireless power receiver and outputting insufficient power amount information if the maximum power that can be supplied is not greater than the required power of all the wireless power receivers And to transmit to each of the entire wireless power receivers.
8. The method of claim 7,
Wherein the controller controls to transmit power to each of the entire wireless power receivers according to the required power of the entire wireless power receivers if the maximum power that can be provided is greater than the required power of the entire wireless power receivers.
8. The method of claim 7,
Wherein the communication unit receives the varying required power from each of all the wireless power receivers according to the insufficient amount of power information,
And the control unit controls to transmit power to each of the entire wireless power receivers according to the variable required power.
In a wireless power receiver,
A power receiver for receiving power from the wireless power transmitter to receive wireless power and performing charging,
A communication unit that performs transmission and reception of the wireless power transmitter,
And a control unit for controlling to transmit necessary power to the wireless power transmitter and controlling the charging current value of the power receiving unit by using the insufficient amount of power information when the insufficient amount of power information is received from the wireless power transmitter Wireless power receiver.
11. The method of claim 10,
Wherein the controller controls to transmit the variable required power according to the variable charging current value to the wireless power transmitter through the communication unit.
11. The method of claim 10,
Wherein the controller controls to receive power received from the wireless power transmitter according to the variable required power to perform charging.

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