KR20230013151A - Method and apparatus for power control in wireless power transmitting system - Google Patents

Abstract

The present invention relates to a power control method and apparatus in a wireless power transmission system, comprising: transmitting wireless power to a wireless power receiver located in a charging area through at least one primary coil; and CEP carrying power control related information. Receiving a signal from the wireless power receiver through the primary coil, driving a CEP timer to check whether the CEP is received within a predetermined time, decoding a signal received through the primary coil counting interrupts that occur, and controlling transmission and interruption of wireless power to the wireless power receiver through the primary coil based on the CEP timer and the interrupt count, wherein the CEP timer Characterized in that it is initialized upon reception of the CEP. According to the present invention, the wireless power transmitter can additionally determine whether the wireless power receiver is located in a charging area and continuously charge even if the wireless power receiver does not transmit a CEP packet for a certain period of time or more.

Description

Power control method and apparatus in wireless power transmission system {METHOD AND APPARATUS FOR POWER CONTROL IN WIRELESS POWER TRANSMITTING SYSTEM}

The present invention relates to wireless power transmission, and more particularly, to a power control method and apparatus in a wireless power transmission system.

In general, in order to charge a portable terminal such as a mobile phone, a laptop computer, or a PDA, the portable terminal needs to receive electrical energy (or power) from an external charger. Such a portable terminal includes a battery cell for storing supplied electrical energy and a circuit for charging and discharging the battery cell (supplying electrical energy to the portable terminal).

The electrical connection method between the charger and the battery cell for charging the battery cell with electrical energy is supplied with commercial power, converts it into voltage and current corresponding to the battery cell, and supplies electrical energy to the battery cell through the terminal of the battery cell. Includes terminal supply method.

This terminal supply method is accompanied by the use of physical cables or wires. Therefore, when handling a lot of terminal supply type equipment, many cables take up a considerable work space, are difficult to organize, and do not look good. In addition, the terminal supply method may cause problems such as instantaneous discharge due to different potential differences between terminals, burnout and fire caused by foreign substances, spontaneous discharge, and degradation of life and performance of the battery pack.

Recently, in order to solve the above problems, a charging system using a wireless power transmission method (hereinafter referred to as a wireless power transmission system) and control methods have been proposed. The wireless power transmission method is also referred to as a contactless power transmission method or a non-contact power transmission method. A wireless power transmission system is composed of a wireless power transmitter that supplies electrical energy in a wireless power transmission method and a wireless power receiver that charges battery cells by receiving electrical energy wirelessly supplied from the wireless power transmitter.

In the terminal supply method, power transmission is performed through a terminal connection between a charger and a terminal, and power transmission can be stopped when a terminal is short-circuited. On the other hand, due to the characteristics of non-contact charging, the wireless power transmission system is coupled between the primary coil provided in the charger and the secondary coil provided in the terminal for charging (magnetic induction and / or magnetic resonance) is required, and the charger transmits power to the terminal through the magnetic field coupling. In such a wireless power transmission system, when the charger performs wireless power transmission, the charger must be able to determine whether the terminal is removed from the charging area and stop power transmission. For example, the terminal transmits a packet such as a control error packet indicating to the charger that the terminal is located in a charging area (or interface surface) to the charger, and the charger For example, if the control error packet is not received for 1.8 seconds), it may be determined that the corresponding terminal is removed from the charging area. However, when the terminal performs battery charging through wireless power reception, serious load fluctuations inside the terminal may occur in some cases (hereinafter referred to as a light load state), which causes distortion in packets transmitted from the terminal to the charger. can happen In this case, even when the terminal is located in the charging area, the charger determines that the terminal is removed from the charging area and stops power transmission.

A technical problem of the present invention is to provide a power control method and apparatus in a wireless power transmission system.

Another technical problem of the present invention is to provide a power control method and apparatus considering a light load state of a wireless power receiver in a wireless power transmission system.

Another technical problem of the present invention is to propose an interpretation standard for a case where a wireless power transmission device receives a distorted signal in a wireless power transmission system.

Another technical problem of the present invention is to propose a criterion for detecting whether a wireless power receiver is removed from a charging area in a wireless power transmission system.

According to one aspect of the present invention, a wireless power transmitter for performing power control is provided. The wireless power transmitter is coupled with at least one secondary coil provided in a wireless power receiver located in a charging area to transmit wireless power. At least one primary coil , A communication unit that receives and decodes a signal including a control error packet (CEP) carrying power control related information from the wireless power receiver through the primary coil, and checks whether the CEP is received within a predetermined time and a control unit configured to drive a CEP timer for processing and to count interrupts generated in decoding a signal received through the primary coil, wherein the control unit controls the primary timer based on the CEP timer and the interrupt count. Controls transmission and interruption of wireless power to the wireless power receiver through a coil, and initializes the CEP timer when the communication unit receives the CEP.

According to another aspect of the present invention, a wireless power transmission method using a wireless power transmission device that performs power control is provided. The wireless power transmission method includes transmitting wireless power to a wireless power receiver located in a charging area through at least one primary coil, and transmitting a signal including a CEP carrying power control related information through the primary coil. Receiving from a wireless power receiver, driving a CEP timer to check whether the CEP is received within a predetermined time, counting interrupts generated in decoding a signal received through the primary coil, and the Controlling wireless power transmission and interruption to the wireless power receiver through the primary coil based on a CEP timer and the interrupt count, wherein the CEP timer is initialized when the CEP is received.

According to the present invention, the wireless power transmitter can additionally determine whether the wireless power receiver is located in a charging area and continuously charge even if the wireless power receiver does not transmit a CEP packet for a certain period of time or longer.

1 shows components of a wireless power transmission system according to an example of the present invention.
2 shows an example of a wireless power transfer procedure.
3 shows an example of a procedure for controlling the amount of transmitted power performed between a wireless power transmitter and a wireless power receiver.
4 is a flowchart illustrating an example of a method of performing power control by a wireless power transmitter in a wireless power transmission system according to the present invention.
5 is a flowchart illustrating another example of a method of performing power control by a wireless power transmitter in a wireless power transmission system according to the present invention.
6 is an example of a block diagram showing a wireless power transmitter and a wireless power receiver according to the present invention.

As used herein, the term "wireless power" is used to mean any form of energy associated with electric, magnetic, electromagnetic, or the like transmitted from a transmitter to a receiver without the use of physical electromagnetic conductors. Wireless power may also be called a power signal, and may mean an oscillating magnetic flux enclosed by a primary coil and a secondary coil. Power conversion in a system is described herein to wirelessly charge devices including, for example, mobile phones, cordless phones, iPods, MP3 players, headsets, and the like. In general, the basic principle of wireless energy transfer includes, for example, both a magnetic induction coupling method and a magnetic resonance coupling (ie, resonance induction) method. However, a variety of frequencies may be used, including those for which license-exempt operation is permitted at relatively high emission levels, for example below 135 kHz (LF) or 13.56 MHz (HF).

1 shows components of a wireless power transmission system according to an example of the present invention.

Referring to FIG. 1, the wireless power transmission system 100 includes a wireless power transmitter 110 and one wireless power receiver 150-1 or n wireless power receivers 150-1, ..., 150 -n).

The wireless power transmitter 110 includes a primary core block. The primary core block may include a core and one or more primary coils 111 . The wireless power transmitter 110 may have any suitable shape, but one preferred shape is a flat platform with a power transfer surface, each having a charging area (e.g., a charging pad) on or near the platform. Wireless power receivers 150-1, ..., 150-n may be located.

The wireless power receivers 150-1, ..., 150-n are separable from the wireless power transmitter 110, and each of the wireless power receivers 150-1, ..., 150-n is A secondary core block coupled with an electromagnetic field generated by the primary core block of the wireless power transmitter 110 when near the wireless power transmitter 110 is provided. The secondary core block may include a core and one or more secondary coils 151 .

The wireless power transmitter 110 transmits power to the wireless power receivers 150-1, ..., 150-n without direct electrical contact. At this time, the primary core block and the secondary core block are said to be magnetically inductively coupled or resonantly inductively coupled to each other. The primary or secondary coil can have any suitable shapes, but can be, for example, copper wire wound around a formation of high permeability, such as ferrite or an amorphous metal.

The wireless power receiver 150-1, ..., 150-n is usually connected to an external load (not shown. Here, also referred to as an actual load of the wireless power receiver), the wireless power transmitter 110 The received power is supplied to the external load. For example, the wireless power receivers 150-1, ..., 150-n may deliver received power to objects that consume or store power, such as portable electrical or electronic devices or rechargeable battery cells or batteries, respectively. there is.

2 shows an example of a wireless power transfer procedure.

Referring to FIG. 2, the wireless power transmitter detects that the wireless power receiver is located in a charging area in a standby mode (S200). Here, there may be several methods for the wireless power transmitter to detect the wireless power receiver, and the present invention is not limited to a specific method. For example, the wireless power transmitter periodically emits an analog ping of a specific frequency, and based on the detected current, resonance shift, or capacitance change, the wireless power receiver is located in the charging area. can detect As another example, when the wireless power transmitter periodically transmits a search signal and the wireless power receiver transmits a response signal based on the search signal, the wireless power receiver is located in the charging area based on the response signal. can detect it. As another example, when the wireless power transmitter periodically transmits a beacon, in response to this, the wireless power receiver transmits a searching signal or advertisement to the wireless power transmitter, thereby transmitting wireless power. The device may detect the wireless power receiver.

The wireless power transmitter transmits an information request signal to the wireless power receiver as a preparation step for wireless power transmission (S210). Here, the information request signal may be a signal requesting the ID and required power information of the wireless power receiver. For example, the information request signal may be transmitted in the form of a data packet message. As another example, the information request signal may be transmitted in the form of a digital ping according to a predefined standard between the wireless power transmitter and the wireless power receiver.

The wireless power receiver transmits ID and configuration information to the wireless power transmitter in response to the information request signal (S220). Here, the configuration information may include a maximum amount of power that the wireless power receiver wants to receive.

The wireless power transmitter configures parameters for power transmission based on the ID and the configuration information and performs wireless power transmission to the wireless power receiver (S230). That is, the wireless power transmitter creates a power transmission contract based on the ID and the configuration information, and transmits wireless power to the wireless power receiver. A step from when the wireless power transmitter starts wireless power transmission to the wireless power receiver to stop it may be referred to as a (wireless) power transfer phase.

The wireless power receiver may supply the received wireless power to an external load such as a battery.

The wireless power transmitter may monitor parameters for power transmission and abort the wireless power transmission when any one of the parameters exceeds a stated limit.

In addition, the wireless power transmission step of S230 may be terminated at the request of the wireless power receiver. For example, the wireless power receiver may transmit a signal requesting termination of wireless power transmission to the wireless power transmitter when the battery is fully charged.

Meanwhile, after S230, the wireless power receiver periodically or aperiodically continuously transmits a control error packet (CEP) to the wireless power transmitter (S240-1, S240-2, S240-3). This is to control the amount of power transmitted from the wireless power transmitter to the wireless power receiver, that is, to perform power control. Power control procedures such as steps S240-1 to S240-3 may include power control procedures according to the embodiments of FIGS. 3 to 5 .

3 shows an example of a procedure for controlling the amount of transmitted power performed between a wireless power transmitter and a wireless power receiver.

Referring to FIG. 3, the wireless power receiver selects a desired control point (S300). Here, the control point may include current and/or voltage, temperature of any part of the wireless power receiver, and the like.

The wireless power receiver determines an actual control point based on the wireless power received from the wireless power transmitter (S310).

The wireless power receiver calculates a control error value using the desired control point and the actual control point (S320). For example, the control error value may be calculated through a (relative) difference between a desired voltage (or current) and an actual voltage (or current).

The wireless power receiver generates a control error packet based on the control error value and transmits it to the wireless power transmitter (S330).

The wireless power transmitter sets a new operation point as needed based on the control error packet (S340). Here, the operating point may be, for example, at least one of the amplitude, frequency, and duty cycle of the AC voltage applied to the primary coil.

The wireless power transmitter performs wireless power transmission to the wireless power receiver based on the new operating point (S350). In this case, the wireless power transmitter may maintain the operating point until a new control error packet is received from the wireless power receiver.

Referring back to FIG. 2, the wireless power transmitter is in the charging area when the control error packet is not received again as in S240-4 within a certain period T (eg, 1.8s) after the control error packet is received. Considering that the wireless power receiving device has been removed, wireless power transmission is stopped (S250). This means that there is no need to stop wireless power transmission even when the user removes the wireless power receiver that receives wireless power from the charging area at any time other than the set limit of the above parameters and the battery is fully charged. because there is

However, when the wireless power receiver performs battery charging through wireless power reception, in the case of a light load state inside the wireless power receiver and/or battery, the packets transmitted from the wireless power receiver to the wireless power transmitter are distorted. this can happen For example, during charging of a battery connected to (or equipped with) a wireless power receiver, charging currents may irregularly change due to load instability in some cases. Packets can be garbled. In this case, even when the wireless power receiver is located in the charging area, the wireless power transmitter determines that the wireless power receiver is removed from the charging area and stops wireless power transmission. This causes unnecessary interruption of wireless power transmission and becomes a problem of delaying battery charging.

4 is a flowchart illustrating an example of a method of performing power control by a wireless power transmitter in a wireless power transmission system according to the present invention. FIG. 4 corresponds to a procedure after step S230 of FIG. 2 is included.

Referring to FIG. 4, the wireless power transmitter drives a control error packet (CEP) timer (S400). This is to check whether the wireless power transmitter receives the CEP within a certain time in the power transmission phase. The timer may be set to the predetermined period T described above in FIG. 2 . In this case, for example, the timer may be set to 1.8s.

The wireless power transmitter initializes the interrupt count (S405). The wireless power transmitter drives a decoding algorithm to decode a message transmitted from the wireless power receiver, and an interrupt is generated for decoding when a received waveform is received from the wireless power receiver. Specifically, when a waveform is applied to the interrupt port of a machine control unit (MCU) provided in a wireless power transmitter, the rising edge and falling edge of the waveform regardless of stationary waveform and non-stationary waveform (eg, impulse noise) An interrupt occurs at the falling edge, and the interrupt count is incremented each time an interrupt occurs.

When the interrupt count is initialized, the wireless power transmitter checks whether an interrupt occurs (S410). For example, when the wireless power transmitter receives a CEP packet, interrupts may be counted about 66 times per CEP packet. One CEP packet includes header, message, and checksum fields each consisting of 1 byte, and each field includes a start bit, parity bit, Since a stop bit may be added, one CEP packet may include a total of 33 bits. Also, since interrupts occur at each rising edge and falling edge of a waveform, 66 interrupts may occur for the 33 bits.

If an interrupt occurs in S410, the wireless power transmitter increases the interrupt count (S415) and checks whether the CEP timer has expired (or timed out) (S420). Here, the CEP timer has a T value as described above.

If no interrupt occurs in S410, the wireless power transmitter checks whether the CEP timer has expired without increasing the interrupt count (S420).

If the CEP timer has not expired in S420, the wireless power transmitter checks whether there is a message packet received from the wireless power receiver (S425).

If there is no message packet received in S425, the wireless power transmitter returns to the procedure S410.

If there is a message packet received in S425 and the packet is a control error packet (CEP) (S430), the wireless power transmitter performs power control as necessary, initializes the CEP timer (S435), and then returns to S405. return to procedure

If there is a message packet received in S425 and the packet is an end power transfer packet (S440), the wireless power transmitter may end the wireless power transmission (S445). Here, the termination power transmission packet indicates a reason for requesting termination of the wireless power transmission, such as, for example, charge complete, over temperature, over voltage, or over current information may be included.

Meanwhile, if the CEP timer expires in S420, the wireless power transmitter checks whether the interrupt count exceeds the reference value (S450). This is to determine whether the wireless power receiver is removed from the charging area based on the interrupt count value when the CEP timer expires. Here, the reference value may be set to 500, for example. In this case, if the interrupt count value is greater than the reference value of 500, the wireless power transmitter may determine that the wireless power receiver is still located in the charging area even though the CEP timer has expired.

If the interrupt count exceeds the reference value in S450, the wireless power transmitter determines that the wireless power receiver is located in the charging area, initializes the CEP timer (S455), and continues the wireless power transmission (S460), and returns to the procedure of S405.

If the interrupt count does not exceed the reference value in S450, the wireless power transmitter considers that the wireless power receiver is removed from the charging area and stops wireless power transmission (S465).

According to the above-described method, the wireless power transmitter additionally determines whether the wireless power receiver is located in the charging area through an interrupt count even if the CEP packet is not transmitted from the wireless power receiver for a certain period of time or longer, and continuously performs charging. can In this case, a serious load fluctuation inside the wireless power receiver and/or battery temporarily occurs, such as a light load state of the wireless power receiver, causing distortion in packets transmitted from the wireless power receiver to the wireless power transmitter. Even in this case, unnecessary interruption of wireless power transmission can be prevented and the battery can be quickly charged.

Meanwhile, when the predetermined period T for the CEP timer is divided into n equal parts and divided into n equal sections to perform the power control operation according to the present invention, it can be expressed as follows.

5 is a flowchart illustrating another example of a method of performing power control by a wireless power transmitter in a wireless power transmission system according to the present invention.

Referring to FIG. 5, the wireless power transmitter drives the CEP timer (S500). The timer may be set to a value obtained by dividing the constant period T described above in FIG. 2 into n equal parts (ie, T/n). For example, when n=5 and T is 1.8s, the CEP timer may be set to 360ms.

The wireless power transmitter initializes the interrupt count (S505).

The wireless power transmitter checks whether an interrupt occurs (S510).

If an interrupt occurs in S510, the wireless power transmitter increases the interrupt count (S515) and checks whether the CEP timer has expired (or timed out) (S520). Here, the CEP timer has a T/n value as described above.

If no interrupt occurs in S510, the wireless power transmitter checks whether the CEP timer has expired without increasing the interrupt count (S520).

Meanwhile, if the CEP timer expires in S520, the wireless power transmitter checks whether the interrupt count exceeds the reference value (S550). Here, the reference value may be set to 100, for example.

If the interrupt count exceeds the reference value in S550, the wireless power transmitter determines that the wireless power receiver is located in the charging area, initializes the CEP timer (S555), and continues the wireless power transmission In the state of doing (S560), it returns to the procedure of S505.

If the interrupt count does not exceed the reference value in S550, the wireless power transmitter increases the CEP decoding failure count (S562). Here, the CEP decoding failure count represents the number of consecutive sections in which CEP decoding fails and the interrupt is equal to or less than the reference value among the n sections described above. That is, when CEP decoding fails for all of the n intervals and the interrupt is detected to be less than the reference value, the wireless power transmitter can be regarded as not receiving the CEP for the predetermined period T, in which case the wireless power receiver It can be seen that is removed from the charging area.

The wireless power transmitter checks whether the CEP decoding failure count is greater than or equal to n (S563).

If the CEP decoding failure count is less than n in S563, the wireless power transmitter initializes the CEP timer (S555) and returns to the procedure S505.

If the CEP decoding failure count is greater than or equal to n in S563, the wireless power transmitter considers that the wireless power receiver is removed from the charging area and stops wireless power transmission (S565).

The remaining steps S525, S530, S535, S540, and S545 are the same as those in FIG. 4, so detailed descriptions thereof are omitted.

6 is an example of a block diagram showing a wireless power transmitter and a wireless power receiver according to the present invention.

Referring to FIG. 6, the wireless power transmitter 600 is connected to at least one primary coil 605 and applies electrical driving signals to the primary coil 605 to generate an electromagnetic field. It includes a power conversion unit (610), a communication unit (620), and a control unit (630).

The wireless power transmitter 600 may have any suitable shape, but one preferred shape is a flat platform with a power transfer surface, each wireless power receiver 650 in a charging area on or near the platform. can be placed

The power conversion unit 610 may be a half-bridge inverter or a full bridge inverter. The power conversion unit 610 may control the frequency, duty cycle, amplitude, and the like of the electric driving signal applied to the primary coil 605 through switching.

The communication unit 620 controls communication between the wireless power transmitter 600 and the wireless power receiver 650. For example, the communication unit 620 may communicate with the wireless power receiver 650 through the primary coil 605 . As another example, the communication unit 620 may communicate with the wireless power receiver 650 through separate radio frequency (RF) communication means provided in the communication unit 620 and the communication unit 680, respectively.

The communication unit 620 may receive ID, configuration information, CEP, or end power transfer packet from the wireless power receiver 650.

The control unit 630 generates a control signal for power control based on the ID, the configuration information, the CEP, and the final power transmission packet, and transmits the control signal to the power conversion unit 610 .

The control unit 630 may perform control operations necessary to implement the present invention as described above.

The control unit 630 may initialize and run the CEP timer. Here, the CEP timer may be set to a reference time T or T/n value.

The control unit 630 may initialize and measure an interrupt count for an interrupt that occurs when the communication unit 630 decodes a received waveform.

The control unit 630 performs power control according to the present invention based on the CEP timer and the interrupt count.

For example, when the CEP timer (eg, T) expires, the control unit 630 compares an interrupt count at the time when the CEP timer expires with a reference value, and if the interrupt count is greater than the reference value, the Despite the expiration of the CEP timer, wireless power transmission through the primary coil 605 may continue assuming that the wireless power receiver 650 is still located in the charging area of the wireless power transmitter 600.

As another example, when the interrupt count is not greater than the reference value, the control unit 630 determines that the wireless power receiver 650 is removed from the charging area according to the expiration of the CEP timer, and the primary coil 605 ) can stop wireless power transmission.

As another example, when the CEP timer (eg, T/n) expires, the control unit 630 compares an interrupt count at the time when the CEP timer expires with a reference value, and the interrupt count is greater than the reference value. case, the CEP decoding failure count is increased, and if the CEP decoding failure count is greater than or equal to n, the wireless power receiver 650 is regarded as removed from the charging area, and wireless power transmission through the primary coil 605 can stop

The wireless power receiver 650 is separable from the wireless power transmitter 600, and when the wireless power receiver 650 is in a charging area of the wireless power transmitter 600, the wireless power transmitter 600 It has at least one secondary coil 655 coupled with the generated electromagnetic field. In this way, power can be transferred from the wireless power transmitter 600 to the wireless power receiver 650 without direct electrical contact. The wireless power receiver includes a load 670, a power pick-up unit 660 connected to the secondary coil 655 to collect power and supplying power to the load 670, and a communication unit 680. ), and a control unit 690.

The communication unit 680 controls communication between the wireless power transmitter 600 and the wireless power receiver 650. For example, the communication unit 680 may communicate with the wireless power transmitter 600 through the secondary coil 605. As another example, the communication unit 620 and the communication unit 680 may each have a separate RF communication means, and the communication unit 680 communicates with the wireless power transmitter 600 through the RF communication means. You may.

The communication unit 680 may transmit an ID, configuration information, CEP, or an end power transfer packet of the wireless power receiver 650 to the wireless power transmitter 600.

The control unit 690 performs a series of controls to allow the wireless power receiver 650 to receive a level of wireless power suitable for it.

All of the above functions may be performed by a processor such as a microprocessor, controller, microcontroller, ASIC (Application Specific Integrated Circuit) according to software or program codes coded to perform the functions. The design, development and implementation of the code will be apparent to those skilled in the art based on the description of the present invention.

Although the present invention has been described with reference to examples, those skilled in the art can practice the present invention by variously modifying and changing it within the scope not departing from the technical spirit and scope of the present invention. You will understand. Therefore, it will be said that the present invention includes all embodiments within the scope of the following claims without being limited to the above-described embodiments.

Claims (16)

In the wireless power transmission device,
at least one primary coil configured to transmit wireless power to a wireless power receiver;
a communication unit configured to receive control data from the wireless power receiver through the primary coil; and
control unit
including,
The control unit
Control transmission of the wireless power to the wireless power receiver based at least in part on the control data received from the wireless power receiver;
When the control data includes a control error packet (CEP) including a control error value, the wireless power through the primary coil is based at least in part on the control error value. A wireless power transmitter configured to set an operating point for transmission. The wireless power transmitter of claim 1, wherein the control error value is received in the CEP from the wireless power receiver. The method of claim 2, wherein the CEP is received through a reception signal from the wireless power receiver,
the control unit is further configured to initialize a CEP timer when the communication unit receives the CEP, and to count an interrupt generated when decoding the received signal;
The control unit is further configured to control or stop the transmission of the wireless power to the wireless power receiver based on the CEP timer and the interrupt count, the wireless power transmitter. According to claim 3,
The CEP timer indicates whether the CEP is received within a predetermined period, wireless power transmitter. According to claim 3,
The control unit stops transmitting the wireless power when the CEP timer expires and the interrupt count is not greater than a reference value,
The control unit continues to transmit the wireless power and initializes the CEP timer when the CEP timer expires and the interrupt count is greater than the reference value,
Wherein the control unit increases a CEP decoding failure count when the CEP timer expires and the interrupt count is not greater than the reference value. According to claim 1,
Wherein the control unit is further configured to terminate the transmission of the wireless power through the primary coil when the control data includes an end power transmission packet. According to claim 6,
The wireless power transmission device, wherein the end power transmission packet includes information indicating a reason for requesting termination of the transmission of the wireless power. According to claim 7,
The reason is to include at least one of a full charge, overheating, overvoltage, or overcurrent, wireless power transmission device. In the method performed by the wireless power transmission device,
Transmitting wireless power to a wireless power receiver through at least one primary coil;
Receiving control data from the wireless power receiver through the primary coil;
controlling transmission of the wireless power to the wireless power receiver based at least in part on the control data received from the wireless power receiver; and
When the control data includes a control error packet (CEP) including a control error value, the wireless power through the primary coil is based at least in part on the control error value. Setting the operating point for transmission
A method performed by a wireless power transmitter comprising a. The method of claim 9, wherein the control error value is received in the CEP from the wireless power receiver. 11. The method of claim 10, wherein the CEP is received through a reception signal from the wireless power receiver, the method comprising:
Initializing a CEP timer when the wireless power transmitter receives the CEP and counting interrupts generated when decoding the received signal; and
Controlling or stopping transmission of the wireless power to the wireless power receiver based on the CEP timer and the interrupt count
A method performed by a wireless power transmitter further comprising a. According to claim 11,
The CEP timer indicates whether the CEP is received within a predetermined period of time, a method performed by a wireless power transmitter. The method of claim 11, wherein controlling or stopping the transmission of the wireless power comprises:
stopping transmission of the wireless power when the CEP timer expires and the interrupt count is not greater than a reference value;
continuing transmission of the wireless power and initializing the CEP timer when the CEP timer expires and the interrupt count is greater than the reference value; and
increasing a CEP decoding failure count when the CEP timer expires and the interrupt count is not greater than the reference value;
A method performed by a wireless power transmitter comprising a. According to claim 9,
The method performed by the wireless power transmitter further comprising terminating the transmission of the wireless power through the primary coil when the control data includes an end power transmission packet. According to claim 14,
The method performed by the wireless power transmitter, wherein the end power transmission packet includes information indicating a reason for requesting termination of the transmission of the wireless power. According to claim 15,
The reason is a method performed by a wireless power transmitter that includes at least one of full charge, overheating, overvoltage, or overcurrent.

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