Wireless power transmitter and control method thereof

Abstract

The present invention provides a wireless power transmitter and a control method thereof. The method includes: outputting a first power for charging a first wireless power receiver through a power transmission circuit of the wireless power transmitter; receiving power information of a second wireless power receiver through a communication unit of the wireless power transmitter, and outputting a first power for charging the first wireless power receiver at the same time, wherein the power information of the second wireless power receiver includes the maximum power of the second wireless power receiver; the controller of the wireless power transmitter identifies that the wireless power transmitter cannot support the maximum power of the second wireless power receiver; based on the identification result, sending a power adjustment command to the second wireless power receiver through the communication unit, the command is used to reduce the amplitude of the power received by the second wireless power receiver to an amplitude within the range that the wireless power transmitter can support; and at least based on the reduced power amplitude, outputting a second power for charging the first and second wireless power receivers through the power transmission circuit.

Description

[0001] This application is a divisional application of an invention patent application with an application date of November 19, 2014, application number 201480063068.2, and invention name “Method for allocating wireless charging power to multiple wireless power receivers”. Technical Field

[0002] Embodiments of the present invention relate to wireless charging, and more particularly, to a method for distributing wireless charging power to a plurality of wireless power receivers in a wireless charging network. Background Art

[0003] Recently, wireless charging technology or contactless charging technology has been developed and has been widely used in various electronic devices. Wireless charging technology is a system using wireless power transmission and reception that can automatically charge the battery of a mobile phone by simply placing the mobile phone on a charging pad without connecting to a separate charging connector, for example. Wireless charging technology can enhance waterproofing by charging electronic products wirelessly, and can improve the portability of electronic devices because a wired charger is unnecessary.

[0004] Among them, charging by using a resonance method is performed as follows. When a wireless power receiver (e.g., a mobile terminal) that needs to be charged is positioned on a wireless power transmitter (e.g., a charging pad) that transmits wireless power, the wireless power transmitter can charge the wireless power receiver. In the case where multiple wireless power receivers are placed in the charging area of ​​a single wireless power transmitter, there may be a difference between the power required by the corresponding wireless power receiver and the transmission power, so the corresponding wireless power receiver needs to be charged efficiently. Summary of the invention

[0005] Technical issues

[0006] As described above, the power required by the wireless power receiver may be different from the power that can be sent from the wireless power transmitter. However, the wireless power receiver is currently charged according to the power supply capability of the wireless power transmitter without separate settings. However, the charging efficiency may vary according to various charging conditions such as the characteristics of the wireless power receiver, the hardware design, the distance between the wireless power receiver and the wireless power transmitter, or the charging position. In addition, in the case of sending power to multiple wireless power receivers, it is necessary to adjust and send power for more efficient power transmission.

[0007] Technical Solution

[0008] Therefore, embodiments of the present invention provide a method for efficiently distributing wireless charging power to multiple wireless power receivers.

[0009] According to an embodiment of the present invention, a method for allocating wireless charging power to multiple wireless power receivers in a wireless power transmitter may include: sending power to a first wireless power receiver to then charge the first wireless power receiver; receiving required power information of a second wireless power receiver; determining power redistribution for the first wireless power receiver and the second wireless power receiver based on the required power information; and sending power according to the power redistribution to the first wireless power receiver and the second wireless power receiver, respectively.

[0010] According to an embodiment of the present invention, a wireless power transmitter for allocating wireless charging power to multiple wireless power receivers may include: a charging unit, which sends power to a first wireless power receiver to then charge the first wireless power receiver; a communication unit, which receives required power information of a second wireless power receiver; and a controller, which controls the charging unit to determine power redistribution for the first wireless power receiver and the second wireless power receiver based on the required power information, and sends power according to the power redistribution to the first wireless power receiver and the second wireless power receiver, respectively.

[0011] Specifically, according to an embodiment of the present invention, a method for controlling a wireless power transmitter includes: outputting a first power for charging a first wireless power receiver through a power transmission circuit of the wireless power transmitter; receiving power information of a second wireless power receiver through a communication unit of the wireless power transmitter, and outputting a first power for charging the first wireless power receiver at the same time, wherein the power information of the second wireless power receiver includes a maximum power of the second wireless power receiver; identifying, by a controller of the wireless power transmitter, that the wireless power transmitter cannot support the maximum power of the second wireless power receiver; based on identifying that the wireless power transmitter cannot support the maximum power of the second wireless power receiver, sending a power adjustment command to the second wireless power receiver through the communication unit, wherein the power adjustment command is used to reduce the amplitude of the power received by the second wireless power receiver to an amplitude within a range that the wireless power transmitter can support; and outputting a second power for charging the first wireless power receiver and the second wireless power receiver through the power transmission circuit at least based on the reduced power amplitude.

[0012] A wireless power transmitter according to an embodiment of the present invention includes: a power transmitting circuit, configured to output a first power for charging a first wireless power receiver; a communication circuit; and a processor, configured to: receive power information of a second wireless power receiver through the communication circuit, and simultaneously send the first power for charging the first wireless power receiver, wherein the power information of the second wireless power receiver includes the maximum power of the second wireless power receiver; identify that the wireless power transmitter cannot support the maximum power of the second wireless power receiver; based on identifying that the wireless power transmitter cannot support the maximum power of the second wireless power receiver, send a power adjustment command to the second wireless power receiver through the communication circuit, wherein the power adjustment command is used to reduce the amplitude of power drawn by the second wireless power receiver to a level within the range that the wireless power transmitter can support, and output, through the power transmitting circuit, at least based on the reduced power amplitude, a second power for charging the first wireless power receiver and the second wireless power receiver, respectively.

[0013] Beneficial Effects

[0014] According to the embodiment of the present invention, the amount of power allocation for each wireless power receiver may be determined in consideration of the states of a plurality of wireless power receivers and a wireless power transmitter, so that power can be efficiently transmitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a conceptual diagram illustrating the overall operation of a wireless charging system.

[0016] Figure 2 is a block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

[0017] Figure 3 is a detailed block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

[0018] Figure 4 is a flowchart illustrating operations of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

[0019] Figure 5 is a flowchart illustrating operations of a wireless power transmitter and a wireless power receiver according to another embodiment of the present invention.

[0020] Figure 6 is a diagram showing the amount of power applied by the wireless power transmitter according to the time axis.

[0021] Figure 7 is a flowchart illustrating a control method of a wireless power transmitter according to an embodiment of the present invention.

[0022] Figure 8 It shows that according to Figure 7 A diagram of an amount of power applied by a wireless power transmitter according to an embodiment of the present invention as a function of time.

[0023] Fig. 9 is a flowchart illustrating a control method of a wireless power transmitter according to an embodiment of the present invention.

[0024] Fig.10 It shows that according to Fig. 9 A diagram of an amount of power applied by a wireless power transmitter according to an embodiment of the present invention as a function of time.

[0025] Fig.11 is a block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

[0026] Fig.12 is a view showing a power distribution method for a plurality of wireless power receivers according to a first embodiment of the present invention.

[0027] Fig.13 is a view showing a power distribution method for a plurality of wireless power receivers according to a second embodiment of the present invention.

[0028] Fig.14 is a view showing a power distribution method for a plurality of wireless power receivers according to a third embodiment of the present invention. DETAILED DESCRIPTION

[0029] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. It should be noted that the same components of the accompanying drawings are indicated by the same reference numerals anywhere. In the following description of the present invention, the detailed description of the known functions and configurations incorporated herein will be omitted when it makes the subject matter of the present invention quite unclear.

[0030] Embodiments of the present invention may provide a method for efficiently transmitting power to a plurality of wireless power receivers by allocating power of the wireless power receivers to be suitable for the respective wireless power receivers according to required power information among the plurality of wireless power receivers.

[0031] According to the wireless charging standard, in the resonance type wireless charging, the wireless power transmitter (power transmitting unit; PTU) is connected to the wireless power receiver (power receiving unit; PRU) through communication, and thereafter, the PRU and the PTU exchange their static parameters through static signals so as to thereby transmit its own status to the other party.

[0032] In an embodiment of the present invention, multiple PRUs may send limited power information to a PTU, and then the PTU may allocate charging power to each PRU more efficiently. At this time, for example, a PRU dynamic signal may be used to send the limited power information from the PRU to the PTU, but the present invention is not limited thereto, and other newly defined signals or other predefined signals may be used to send the limited power information.

[0033] First, refer to Figures 1 to 11 The concept of a wireless charging system that can be applied to an embodiment of the present invention is described.

[0034] Figure 1 is a conceptual diagram illustrating the overall operation of a wireless charging system. Figure 1 As shown in , the wireless charging system includes a wireless power transmitter 100 and one or more wireless power receivers 110 - 1 , 110 - 2 , and 110 - n.

[0035] The wireless power transmitter 100 may wirelessly transmit power 1-1, 1-2 or 1-n to one or more wireless power receivers 110-1, 110-2 and 110-n. More specifically, the wireless power transmitter 100 may wirelessly transmit power 1-1, 1-2 or 1-n only to wireless power receivers that have been authenticated through a predetermined authentication process.

[0036] The wireless power transmitter 100 may form an electrical connection with the wireless power receivers 110-1, 110-2, and 110-n. 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, and 110-n.

[0037] In addition, the wireless power transmitter 100 can perform bidirectional communication with the wireless power receivers 110-1, 110-2 and 110-n. Here, the wireless power transmitter 100 and the wireless power receivers 110-1, 110-2 and 110-n can process or send / receive packets 2-1, 2-2 and 2-n composed of predetermined frames. The aforementioned frames will be described in more detail later. The wireless power receiver can be specifically implemented by a mobile communication terminal, a PDA, a PMP or a smart phone.

[0038] The wireless power transmitter 100 can provide power to multiple wireless power receivers 110-1, 110-2 and 110-n in a wireless manner. For example, the wireless power transmitter 100 can transmit power to multiple wireless power receivers 110-1, 110-2 and 110-n in a wireless manner through a resonance method. In the case where the wireless power transmitter 100 adopts the resonance method, the distance between the wireless power transmitter 100 and each of the multiple wireless power receivers 110-1, 110-2 and 110-n can preferably be equal to or less than 30m. In addition, in the case where the wireless power transmitter 100 adopts the electromagnetic induction method, the distance between the wireless power transmitter 100 and each of the multiple wireless power receivers 110-1, 110-2 and 110-n can preferably be equal to or less than 10cm.

[0039] The wireless power receivers 110-1, 110-2, and 110-n may receive wireless power from the wireless power transmitter 100 to thereby charge the battery. In addition, the wireless power receivers 110-1, 110-2, and 110-n may transmit a signal requesting wireless power transmission, information required for wireless power reception, state information of the wireless power receiver, or control information of the wireless power transmitter 100 to the wireless power transmitter 100. Information about the transmitted signal will be described in more detail later.

[0040] In addition, the wireless power receivers 110 - 1 , 110 - 2 , and 110 - n may transmit a message indicating a charging state of each wireless power receiver to the wireless power transmitter 100 .

[0041] The wireless power transmitter 100 may include a display device such as a display so as to display the status of each of the wireless power receivers 110-1, 110-2, and 110-n based on the message received from each of the wireless power receivers 110-1, 110-2, and 110-n. In addition, the wireless power transmitter 100 may display the estimated remaining time to complete charging of each of the wireless power receivers 110-1, 110-2, and 110-n.

[0042] The wireless power transmitter 100 may transmit a control signal for disabling the wireless charging function to each of the wireless power receivers 110-1, 110-2, and 110-n. The wireless power receiver having received the control signal for disabling the wireless charging function from the wireless power transmitter 100 may disable the wireless charging function.

[0043] Figure 2 is a block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

[0044] like Figure 2As shown in , the wireless power transmitter 200 may include a power transmitting unit 211, a controller 212, and a communication unit 213. In addition, the wireless power receiver 250 may include a power receiving unit 251, a controller 252, and a communication unit 253.

[0045] The power transmission unit 211 can provide the power required by the wireless power transmitter 200, and can provide the power to the wireless power receiver 250 in a wireless manner. Here, the power transmission unit 211 can supply power in the form of an AC wave, or can supply power in the form of a DC wave that is converted into an AC wave by an inverter and then supplied in the form of an AC wave. The power transmission unit 211 can be implemented in the form of a built-in battery, or can be implemented in the form of a power receiving interface so as to receive power from the outside and so as to supply the power to other components. It can be understood by those skilled in the art that the power transmission unit 211 is not limited, and any device that can provide power according to an AC waveform can be used as the power transmission unit 211.

[0046] In addition, the power transmission unit 211 can provide the wireless power receiver 250 with an alternating current wave in the form of an electromagnetic wave. The power transmission unit 211 may also include a resonant circuit, and then, it can transmit or receive a predetermined electromagnetic wave. If the power transmission unit 211 is implemented by a resonant circuit, the inductance (L) of the toroidal coil of the resonant circuit may be variable. In addition, it can be understood by those skilled in the art that the power transmission unit 211 is not limited, and any device capable of transmitting and receiving electromagnetic waves can be used as the power transmission unit 211.

[0047] The controller 212 may control the overall operation of the wireless power transmitter 200. The controller 212 may control the overall operation of the wireless power transmitter 200 by using an algorithm, program, or application read from a storage unit (not shown) for control. The controller 212 may be implemented in the form of a CPU, a microprocessor, or a microcomputer. The detailed operation of the controller 212 will be described in more detail later.

[0048] The communication unit 213 may perform communication with the wireless power receiver 250 in a predetermined manner. The communication unit 213 may perform communication with the communication unit 253 of the wireless power receiver 250 by using a scheme of NFC (near field communication), Zigbee communication, infrared communication, visible light communication, Bluetooth communication, or BLE (Bluetooth Low Energy). The communication unit 213 may also use a CSMA / CA algorithm. In addition, the aforementioned communication scheme is merely exemplary, and the scope of the embodiments of the present invention is not limited to the specific communication scheme performed by the communication unit 213.

[0049] In addition, the communication unit 213 may transmit a signal regarding information of the wireless power transmitter 200. Here, the communication unit 213 may unicast, multicast, or broadcast the signal.

[0050] In addition, the communication unit 213 may receive power information from the wireless power receiver 250. Here, the power information may include at least one of the capability of the wireless power receiver 250, battery percentage, number of times charging occurs, amount used, battery capacity, or battery ratio.

[0051] In addition, the communication unit 213 may transmit a charging function control signal for controlling the charging function of the wireless power receiver 250. The charging function control signal may control the wireless power receiving unit 251 of the specific wireless power receiver 250 to enable or disable the charging function. Optionally, as will be described in more detail later, the power information may include information such as the introduction of a wired charging terminal, switching from the SA mode to the NSA mode, and release of an error situation.

[0052] The communication unit 213 may receive a signal from another wireless power transmitter (not shown) as well as from the wireless power receiver 250. For example, the communication unit 213 may receive a notification signal from another wireless power transmitter.

[0053] In addition, despite the Figure 2 The power transmission unit 211 and the communication unit 213 are illustrated as different hardware elements so that the wireless power transmitter 200 performs out-of-band communication, but this is only an example. In the present invention, the power transmission unit 211 and the communication unit 213 can be implemented as a single hardware element so that the wireless power transmitter 200 can perform in-band communication.

[0054] The wireless power transmitter 200 and the wireless power receiver 250 may transmit and receive various signals, and thus, may perform registration of the wireless power receiver 250 in the wireless power network managed by the wireless power transmitter 200 and a charging operation through transmission and reception of wireless power. The above operation will be described in more detail later.

[0055] Figure 3 is a detailed block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

[0056] like Figure 3As shown in , the wireless power transmitter 200 may include a power transmission unit 211, a controller and communication units 212 and 213, a driving unit 214, an amplification unit 215, and a matching unit 216. The wireless power receiver 250 may include a power receiving unit 251, a controller and communication units 252 and 253, a rectifying unit 254, a DC / DC converter 255, a switching unit 256, and a load unit 257.

[0057] The driving unit 214 may output a DC power of a predetermined voltage value. The voltage value of the DC power output from the driving unit 214 may be controlled by the controller and the communication units 212 and 213 .

[0058] The direct current output from the driving unit 214 may be output to the amplifying unit 215. The amplifying unit 215 may amplify the direct current with a predetermined gain. In addition, the amplifying unit may convert the direct current power into alternating current based on the signal input from the controller and the communication units 212 and 213. Accordingly, the amplifying unit 215 may output alternating current power.

[0059] The matching unit 216 may perform impedance matching. For example, by adjusting the impedance seen from the matching unit 216, efficient power or high power may be output. The matching unit 216 may adjust the impedance based on the control of the controller and the communication units 212 and 213. The matching unit 216 may include at least one of a coil or a capacitor. The controller and the communication units 212 and 213 may control the connection state using at least one of the coil or the capacitor so as to thereby perform impedance matching.

[0060] The power transmission unit 211 may transmit the input AC power to the power receiving unit 251. The power transmission unit 211 and the power receiving unit 251 may be implemented as a resonant circuit having the same resonant frequency. For example, the resonant frequency may be determined to be 6.78 MHz.

[0061] In addition, the controller and communication units 212 and 213 can communicate with the controller and communication units 252 and 253 of the wireless power receiver 250, and for example, they can perform communication (WiFi, ZigBee or BT / BLE) at a bilateral frequency of 2.4 GHz.

[0062] In addition, the power receiving unit 251 may receive charging power.

[0063] The rectifier unit 254 can rectify the wireless power received by the power receiving unit 251 into a direct current form, and for example, can be implemented in the form of a bridge rectifier diode (bridge diode). The DC / DC converter 255 can convert the rectified power into a power of a predetermined gain. For example, the DC / DC converter 255 can convert the rectified power so that the voltage of the output terminal is 5V. In addition, the minimum and maximum values ​​of the voltage that can be applied to the front terminal (frontterminal) of the DC / DC converter 255 can be preconfigured.

[0064] The switch unit 256 may connect the DC / DC converter 255 and the load unit 257. The switch unit 256 may maintain an on / off state according to the control of the controller 252. The load unit 257 may store the converted power input from the DC / DC converter 255 when the switch unit 256 is in an on state.

[0065] Figure 4 1 is a flowchart illustrating the operation of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention. Figure 4 As shown in FIG. 4 , the wireless power transmitter 400 may be applied with power ( S401 ). When power is applied, the wireless power transmitter 400 may configure an environment ( S402 ).

[0066] The wireless power transmitter 400 may enter a power saving mode (S403). In the power saving mode, the wireless power transmitter 400 may apply a heterogeneous power beacon for detection in each cycle. Figure 6 This is described in more detail in . Figure 4 As shown in , the wireless power transmitter 400 may apply power beacons 404 and 405 for detection, and the power values ​​of the power beacons 404 and 405 for detection may be different from each other. Some or all of the power beacons 404 and 405 for detection may have an amount of power for driving the communication unit of the wireless power receiver 450. For example, the wireless power receiver 450 may drive the communication unit through some or all of the power beacons 404 and 405 for detection, so as to communicate with the wireless power transmitter 400. At this time, this state may be referred to as an empty state.

[0067] The wireless power transmitter 400 may detect the load change through the arrangement of the wireless power receiver 450. The wireless power transmitter 400 may enter a low power mode (S408). Figure 6The low power mode is described in more detail. In addition, the wireless power receiver 450 may drive the communication unit based on the power received from the wireless power transmitter 400 (S409).

[0068] The wireless power receiver 450 may transmit a wireless power transmitter search signal (PTU search) to the wireless power transmitter 400 (S410). The wireless power receiver 450 may transmit the wireless power transmitter search signal by using an advertisement signal based on BLE. The wireless power receiver 450 may periodically transmit the wireless power transmitter search signal, and may transmit the wireless power transmitter search signal until a response signal is received from the wireless power transmitter 400 or until a predetermined time period expires.

[0069] When receiving the wireless power transmitter search signal from the wireless power receiver 450 , the wireless power transmitter 400 may transmit a response signal (PRU response) ( S411 ) Here, the response signal may form a connection between the wireless power transmitter 400 and the wireless power receiver 450 .

[0070] The wireless power receiver 450 may transmit a PRU static signal ( S412 ). Here, the PRU static signal may be a signal indicating a state of the wireless power receiver 450 .

[0071] In addition, the PRU static signal may have a data structure as shown in Table 1.

[0072] [Table 1]

[0073]

[0074]

[0075] Therefore, the wireless power transmitter 400 may transmit a PTU static signal including a data field as shown in Table 1 to the wireless power receiver ( S413 ). The PTU static signal transmitted by the wireless power transmitter 400 may be a signal indicating the capability of the wireless power transmitter 400 .

[0076] When the wireless power transmitter 400 and the wireless power receiver 450 transmit and receive the PRU static signal and the PTU static signal, the wireless power receiver 450 may periodically transmit the PRU dynamic signal (S414 and S415). The PRU dynamic signal may include information about one or more parameters measured in the wireless power receiver 450. For example, the PRU dynamic signal may include voltage information of the rear end of the rectifying unit of the wireless power receiver 450. The state of the wireless power receiver 450 may be called a boot state (S407).

[0077] At this time, according to various embodiments of the present invention, the voltage value re-adjusted according to the situation may be included in the PRU static signal to be then transmitted, so that the initially configured voltage value can be re-adjusted through the PRU static signal to comply with the situation.

[0078] In addition, the wireless power transmitter 400 may enter a power transmission mode (S416), and the wireless power transmitter 400 may transmit a PRU control signal as a command signal to allow the wireless power receiver 450 to perform charging (S417). In the power transmission mode, the wireless power transmitter 400 may transmit charging power.

[0079] The PRU control signal sent by the wireless power transmitter 400 may include permission information and information for enabling / disabling charging of the wireless power receiver 450. The PRU control signal may be sent when the wireless power transmitter 400 is about to change the state of the wireless power receiver 450 or in a predetermined cycle (e.g., in a cycle of 250ms). The wireless power receiver 450 may change the configuration according to the PRU control signal, and may send a PRU dynamic signal for reporting the state of the wireless power receiver 450 (S418 and S419). The PRU dynamic signal sent by the wireless power receiver 450 may include at least one of the voltage information, current information, or state and temperature information of the wireless power receiver. At this time, the state of the wireless power receiver 450 may be referred to as an on state.

[0080] In addition, the PRU dynamic signal may have a data structure as shown in Table 2.

[0081] [Table 2]

[0082]

[0083] The PRU dynamic signal as shown in Table 2 may include at least one of the following items: optional field information; voltage information of the back end of the rectifying unit of the wireless power receiver; current information of the back end of the rectifying unit of the wireless power receiver; voltage information of the back end of the DC / DC converter of the wireless power receiver; current information of the back end of the DC / DC converter of the wireless power receiver; temperature information; minimum voltage value information (VRECT_MIN_DYN) of the back end of the rectifying unit of the wireless power receiver; optimal voltage value information (VRECT_SET_DYN) of the back end of the rectifying unit of the wireless power receiver; maximum voltage value information (VRECT_HIGH_DYN) of the back end of the rectifying unit of the wireless power receiver; or alarm information (PRU alarm).

[0084] Therefore, as described above, one or more configured voltage values ​​{e.g., minimum voltage value information (VRECT_MIN_DYN) of the rear end of the rectifying unit of the wireless power receiver, optimal voltage value information (VRECT_SET_DYN) of the rear end of the rectifying unit of the wireless power receiver, or maximum voltage value information (VRECT_HIGH_DYN) of the rear end of the rectifying unit of the wireless power receiver} determined according to the situation may be included in the corresponding field of the PRU dynamic signal to be then transmitted. As described above, the PTU having received the PRU dynamic signal adjusts the wireless charging voltage to be transmitted to each PRU with reference to the configured voltage value included in the PRU dynamic signal.

[0085] The alarm information may be formed in a data structure as shown in Table 3 below.

[0086] [Table 3]

[0087]

[0088] The alarm information as shown in Table 3 may include fields of over voltage, over current, over temperature, charging completion, wired charging terminal insertion detection (TA detection), SA mode / NAS mode transition, and restart request.

[0089] The wireless power receiver 450 may receive a PRU control signal to thereby perform charging. For example, if the wireless power transmitter 400 has enough power to charge the wireless power receiver 450, the wireless power transmitter 400 may send a PRU control signal to enable charging. In addition, a PRU control signal may be sent whenever the charging state changes. For example, the PRU control signal may be sent every 250 ms, or may be sent when a parameter changes. The PRU control signal may be configured to be sent within a predetermined threshold time (e.g., 1 second) even when there is no parameter change.

[0090] In addition, the wireless power receiver 450 can detect the occurrence of an error. The wireless power receiver 450 can send an alarm signal to the wireless power transmitter 400 (S420). The alarm signal can be sent by using a PRU dynamic signal or a PRU alarm signal. For example, the wireless power receiver 450 can reflect the error condition to the PRU alarm field of Table 3, and these error conditions can be sent to the wireless power transmitter 400. Optionally, the wireless power receiver 450 can send a single alarm signal (e.g., a PRU alarm signal) indicating an error condition to the wireless power transmitter 400. When the alarm signal is received, the wireless power transmitter 400 can enter a latched fault mode (S422). The wireless power receiver 450 can enter an empty state (S423).

[0091] Figure 5 is a flowchart illustrating the operation of a wireless power transmitter and a wireless power receiver according to another embodiment of the present invention. Figure 6 Describe in more detail Figure 5 control method. Figure 6 It shows Figure 5 A diagram of the amount of power applied by a wireless power transmitter according to a time axis in an embodiment of the present invention.

[0092] like Figure 5 As shown in FIG. 5 , the wireless power transmitter may start operation (S501). In addition, the wireless power transmitter may reset the initial configuration (S503). The wireless power transmitter may enter a power saving mode (S505). Here, the power saving mode may be a period during which the wireless power transmitter applies heterogeneous power with different amounts of power to the power transmission unit. For example, it may be a period during which the wireless power transmitter applies heterogeneous power with different amounts of power to the power transmission unit. Figure 6 601 or 602 and the third detection power 611, 612, 613, 614, or 615 in the second detection power 601 or 602 and the third detection power 611, 612, 613, 614, or 615 in the second time period. Here, the wireless power transmitter may periodically apply the second detection power 601 or 602 in the second cycle in the second time period. The wireless power transmitter may periodically apply the third detection power 611, 612, 613, 614, or 615 in the third cycle in the third time period. In addition, although the third detection power values ​​611, 612, 613, 614, and 615 are illustrated as being different from each other, the third detection power values ​​611, 612, 613, 614, and 615 may be different, or may be the same.

[0093] For example, after outputting the third detection power 611, the wireless power transmitter may output the third detection power of the same amount of power 612. As described above, in the case where the wireless power transmitter outputs the third detection power of the same value, the third detection power may have an amount of power capable of detecting a minimum wireless power receiver (e.g., a wireless power receiver of category 1).

[0094] On the contrary, after outputting the third detection power 611, the wireless power transmitter may output a third detection power 612 of a different amount of power. As described above, in the case where the wireless power transmitter outputs a third detection power of a different value, the third detection power may have an amount of power capable of detecting wireless power receivers of categories 1 to 5. For example, the third detection power 611 may have an amount of power capable of detecting a wireless power receiver of category 5, and the third detection power 612 may have an amount of power capable of detecting a wireless power receiver of category 3. In addition, the third detection power 613 may have an amount of power capable of detecting a wireless power receiver of category 1.

[0095] In addition, the second detection power 601 or 602 may drive the wireless power receiver. More specifically, the second detection power 601 or 602 may have an amount of power capable of driving the controller and the communication unit of the wireless power receiver.

[0096] The wireless power transmitter may apply a second detection power 601 or 602 and a third detection power 611, 612, 613, 614, or 615 to the power receiving unit in the second cycle and in the third cycle, respectively. When the wireless power receiver is placed on the wireless power transmitter, the impedance seen from one point of the wireless power transmitter may be changed. The wireless power transmitter may detect a change in impedance while applying the second detection power 601 or 602 and the third detection power 611, 612, 613, 614, or 615. For example, the wireless power transmitter may detect a change in impedance while applying the third detection power 615. Accordingly, the wireless power transmitter may detect an object (S507). If no object is detected (S507-No), the wireless power transmitter may maintain a power saving mode (S505) in which heterogeneous power is periodically applied.

[0097] In addition, if the object is detected due to the change in impedance (S507-Yes), the wireless power transmitter may enter a low power mode. Here, the low power mode means a mode in which the wireless power transmitter applies driving power capable of driving the controller and the communication unit of the wireless power receiver. For example, in Figure 6 In the embodiment of the present invention, the wireless power transmitter may apply driving power 620 to the power transmission unit. The wireless power receiver may receive the driving power 620 so as to drive the controller and the communication unit. The wireless power receiver may perform communication with the wireless power transmitter in a predetermined manner based on the driving power 620. For example, the wireless power receiver may send and receive data required for verification, and based on the data, may join a wireless power network managed by the wireless power transmitter. However, when a foreign object other than the wireless power receiver is placed, data transmission and reception cannot be performed. Therefore, the wireless power transmitter may determine whether the placed object is a foreign object (S511). For example, if the wireless power transmitter fails to receive a response from the object within a predetermined time period, the wireless power transmitter may determine the object as a foreign object.

[0098] If the object is determined to be a foreign object (S511-Yes), the wireless power transmitter may enter the latched fault mode (S513). On the contrary, if the object is determined not to be a foreign object (S511-No), the wireless power transmitter may continue the registration operation (S519). For example, the wireless power transmitter may periodically apply the first cycle. Figure 6The first power 631 to 634 of the wireless power transmitter. The wireless power transmitter may detect a change in impedance while applying the first power. For example, if a foreign object is collected (S515-Yes), the wireless power transmitter may detect a change in impedance so as to determine that the foreign object has been collected. Alternatively, if no foreign object is collected (S515-No), the wireless power transmitter may not detect a change in impedance so as to determine that the foreign object has not been collected. If no foreign object is collected, the wireless power transmitter may output at least one of a light or an alarm sound so as to notify the user that the wireless power transmitter is currently in an error state. Accordingly, the wireless power transmitter may include an output unit that outputs at least one of a light and an alarm sound.

[0099] If it is determined that the foreign object has not been collected (S515-No), the wireless power transmitter may maintain the latched fault mode (S513). In addition, if it is determined that the foreign object has been collected (S515-Yes), the wireless power transmitter may re-enter the power saving mode (S517). For example, the wireless power transmitter may apply Figure 6 The second power 651 or 652 and the third power 661 to 665.

[0100] As described above, if a foreign object other than the wireless power receiver is placed, the wireless power transmitter may enter the latched fault mode. In addition, the wireless power transmitter may determine whether a foreign object is collected based on a change in impedance due to power applied in the latched fault mode. That is, the criteria for entering the latched fault mode may be Figure 5 and Figure 6 In addition to the placement of foreign objects, the wireless power transmitter may also have various criteria for entering the latched fault mode. For example, the wireless power transmitter may be cross-connected with the placed wireless power receiver, and in this case, the wireless power transmitter may enter the latched fault mode.

[0101] Accordingly, in the event of a cross connection, the wireless power transmitter is required to return to the initial state and the wireless power receiver needs to be collected. The wireless power transmitter can configure the cross connection of the wireless power receiver placed on another wireless power transmitter to join the wireless power network as a criterion for entering the latched fault mode. Figure 7 The operation of a wireless power transmitter in the event of an error, including a cross connection, is described.

[0102] Figure 7 is a flowchart illustrating a control method of a wireless power transmitter according to an embodiment of the present invention. Figure 8 Describe in more detail Figure 7 control method. Figure 8 It shows that according to Figure 7 A diagram of an amount of power applied by a wireless power transmitter according to an embodiment of the present invention as a function of time.

[0103] The wireless power transmitter may start operation (S701). In addition, the wireless power transmitter may reset the initial configuration (S703). The wireless power transmitter may enter a power saving mode (S705). Here, the power saving mode may be a period during which the wireless power transmitter applies heterogeneous power with different amounts of power to the power transmission unit. For example, it may be a period during which the wireless power transmitter applies heterogeneous power with different amounts of power to the power transmission unit. Figure 8 801 or 802 and the third detection power 811, 812, 813, 814, or 815 in the second detection power 801 or 802 in the second time period and the third detection power 811, 812, 813, 814, or 815 in the second detection power 801 or 802 in the second cycle in the second time period. The wireless power transmitter may periodically apply the third detection power 811, 812, 813, 814, or 815 in the third cycle in the third time period. In addition, although the third detection power values ​​811, 812, 813, 814, and 815 are illustrated as being different from each other, the third detection power values ​​811, 812, 813, 814, and 815 may be different, or may be the same.

[0104] In addition, the second detection power 801 or 802 may drive the wireless power receiver. More specifically, the second detection power 801 or 802 may have an amount of power capable of driving the controller and the communication unit of the wireless power receiver.

[0105] The wireless power transmitter may apply a second detection power 801 or 802 and a third detection power 811, 812, 813, 814, or 815 to the power receiving unit in the second cycle and in the third cycle, respectively. When the wireless power receiver is placed on the wireless power transmitter, the impedance seen from one point of the wireless power transmitter may be changed. The wireless power transmitter may detect a change in impedance while applying the second detection power 801 or 802 and the third detection power 811, 812, 813, 814, or 815. For example, the wireless power transmitter may detect a change in impedance while applying the third detection power 815. Accordingly, the wireless power transmitter may detect an object (S707). If no object is detected (S707-No), the wireless power transmitter may maintain a power saving mode (S705) in which heterogeneous power is periodically applied.

[0106] In addition, if the object is detected due to the change in impedance (S707-Yes), the wireless power transmitter may enter a low power mode (S709). Here, the low power mode means a mode in which the wireless power transmitter applies driving power capable of driving the controller and the communication unit of the wireless power receiver. For example, in Figure 8 In the embodiment of the present invention, the wireless power transmitter may apply driving power 820 to the power transmission unit. The wireless power receiver may receive the driving power 820 so as to drive the controller and the communication unit. The wireless power receiver may perform communication with the wireless power transmitter in a predetermined manner based on the driving power 820. For example, the wireless power receiver may send and receive data required for verification, and based on the data, may join a wireless power network managed by the wireless power transmitter.

[0107] Thereafter, the wireless power transmitter may enter a power transmission mode for transmitting charging power (S711). For example, the wireless power transmitter may apply charging power 821, such as Figure 8 and the charging power can be sent to a wireless power receiver.

[0108] The wireless power transmitter can determine whether an error occurs in the power transmission mode. Here, the error can be a foreign object placed on the wireless power transmitter, a cross connection, an overvoltage, an overcurrent, an overtemperature, etc. The wireless power transmitter may include a sensing unit capable of measuring overvoltage, overcurrent, overtemperature, etc. For example, the wireless power transmitter may measure the voltage or current of a reference point, and if the measured voltage or current exceeds a threshold value, the wireless power transmitter may determine that the criterion for overvoltage or overcurrent has been met. Optionally, the wireless power transmitter may include a temperature sensing device that measures the temperature of a reference point of the wireless power transmitter. If the temperature of the reference point exceeds a threshold value, the wireless power transmitter may determine that the criterion for overtemperature has been met.

[0109] In addition, if the state is determined to be overvoltage, overcurrent or overtemperature according to the measurement result of temperature, voltage or current, the wireless power transmitter may reduce the wireless charging power to a predetermined value so as to prevent overvoltage, overcurrent or overtemperature. At this time, if the voltage value of the reduced wireless charging power is less than the configured minimum value {for example, the minimum voltage value (V RECT_MIN_DYN )}, the wireless charging is stopped, so the configured voltage value can be readjusted according to the embodiment of the present invention.

[0110] although Figure 8 The embodiment illustrates an error in which a foreign object is also placed on the wireless power transmitter, however the error is not limited thereto, and a person skilled in the art can easily understand that the wireless power transmitter can also operate in a similar manner in the event of cross connection, overvoltage, overcurrent or overtemperature.

[0111] If no error has occurred (S713-No), the wireless power transmitter may maintain the power transmission mode (S711). In addition, if an error has occurred (S713-Yes), the wireless power transmitter may enter the latched fault mode (S715). For example, the wireless power transmitter may apply Figure 8 831 to 835 shown in FIG. 831. In addition, the wireless power transmitter may output an error occurrence display including at least one of a light or an alarm sound in the latched fault mode. If it is determined that the foreign object or wireless power receiver has not been collected (S717-No), the wireless power transmitter may maintain the latched fault mode (S715). In addition, if it is determined that the foreign object or wireless power receiver has been collected (S717-Yes), the wireless power transmitter may enter the power saving mode again (S719). For example, the wireless power transmitter may apply Figure 8 The second power 851 or 852 and the third power 861 to 865.

[0112] An operation in which an error occurs while the charging power is transmitted by the wireless power transmitter has been described above. Hereinafter, an operation in which a plurality of wireless power receivers on the wireless power transmitter receive the charging power will be described.

[0113] Fig. 9 is a flowchart illustrating a control method of a wireless power transmitter according to an embodiment of the present invention. Fig.10 Describe in more detail Fig. 9 control method. Fig.10 It shows that according to Fig. 9 A diagram of an amount of power applied by a wireless power transmitter according to an embodiment of the present invention as a function of time.

[0114] like Fig. 9 As shown in , the wireless power transmitter can send charging power to the first wireless power receiver (S901). In addition, the wireless power transmitter can also allow the second wireless power receiver to join the wireless power network (S903). In addition, the wireless power transmitter can send charging power to the second wireless power receiver (S905). More specifically, the wireless power transmitter can apply the sum of the charging power values ​​required by the first wireless power receiver and the second wireless power receiver to the power receiving unit.

[0115] Fig.10The implementation of operation S901 to operation S905 is illustrated. For example, the wireless power transmitter may maintain a power saving mode in order to apply a second detection power 1001 or 1002 and a third detection power 1011 to 1015. Thereafter, the wireless power transmitter may detect a first wireless power receiver and may enter a low power mode in order to maintain the detection power 1020. Thereafter, the wireless power transmitter may enter a power transmission mode in order to apply a first charging power 1030. The wireless power transmitter may detect a second wireless power receiver and may allow the second wireless power receiver to join a wireless power network. In addition, the wireless power transmitter may apply a second charging power 1040 having an amount of power corresponding to the sum of the power values ​​required by the first wireless power receiver and the second wireless power receiver.

[0116] Return to reference Fig. 9 , the wireless power transmitter may transmit charging power to both the first wireless power receiver and the second wireless power receiver (S905), and may detect that an error occurs during transmission (S907). Here, as described above, the error may be the placement of a foreign object, a cross connection, an overvoltage, an overcurrent, or an overtemperature. If no error occurs (S907-No), the wireless power transmitter may maintain the application of the second charging power 1040.

[0117] In addition, if an error has occurred (S907-Yes), the wireless power transmitter may enter a latched fault mode (S909). For example, the wireless power transmitter may apply a latched fault mode in the first cycle. Fig.10 The wireless power transmitter may determine whether all of the wireless power receiver and the second wireless power receiver are collected (S911). For example, the wireless power transmitter may detect a change in impedance while applying the first power 1051 to 1055. The wireless power transmitter may determine whether all of the wireless power receiver and the second wireless power receiver are collected based on whether the impedance returns to an initial value.

[0118] If it is determined that all of the wireless power receiver and the second wireless power receiver have been collected (S911-Yes), the wireless power transmitter may enter a power saving mode (S913). Fig.10 As shown in , the wireless power transmitter may apply the second detection power 1061 or 1062 and the third detection powers 1071 to 1075 in the second cycle and in the third cycle, respectively.

[0119] As described above, in the case where charging power is applied to a plurality of wireless power receivers, the wireless power transmitter can easily determine whether a wireless power receiver or a foreign object is collected when an error occurs.

[0120] Fig.11 is a block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

[0121] The wireless power transmitter 1100 may include a communication unit 1110, a power amplifier (PA) 1120, and a resonator 1130. The wireless power receiver 1150 may include a communication unit 1151, an application processor (AP) 1152, a power management integrated circuit (PMIC) 1153, a wireless power integrated circuit (WPIC) 1154, a resonator 1155, an interface power management (IFPM) IC 1157, a travel adapter (TA) 1158, and a battery 1159.

[0122] The communication unit 1110 may perform communication with the communication unit 1151 based on a predetermined scheme (e.g., a BLE scheme). For example, the communication unit 1151 of the wireless power receiver 1150 may transmit a PRU dynamic signal having a data structure shown in Table 2 to the communication unit 1110 of the wireless power transmitter 1100. As described above, the PRU dynamic signal may include at least one of voltage information, current information, temperature information, or alarm information of the wireless power receiver 1150.

[0123] Based on the received PRU dynamic signal, the output power value from the power amplifier 1120 may be adjusted. For example, if the wireless power receiver 1150 reaches a state of overvoltage, overcurrent, or overtemperature, the power value output from the power amplifier 1120 may be reduced. In addition, if the voltage value or current value of the wireless power receiver 1150 is less than a predetermined value, the power value output from the power amplifier 1120 may be increased.

[0124] The charging power from resonator 1130 may be sent wirelessly to resonator 1155 .

[0125] The wireless power integrated circuit 1154 may rectify the charging power received from the resonator 1155 and may perform DC / DC conversion. The wireless power integrated circuit 1154 may drive the communication unit 1151 or may charge the battery 1159 by using the converted power.

[0126] In addition, a wired charging terminal may be inserted into the travel adapter 1158. A wired charging terminal (such as a 30-pin connector or a USB connector) may be inserted into the travel adapter 1158, and the travel adapter 1158 may receive power supplied from an external power source to thereby charge the battery 1159.

[0127] The interface power management integrated circuit 1157 may process power supplied from the wired charging terminal to thereby output the power to the battery 1159 and the power management integrated circuit 1153 .

[0128] The power management integrated circuit 1153 may manage power received wirelessly, power received in a wired manner, or power applied to each element of the wireless power receiver 1150. The AP 1152 may receive power information from the power management integrated circuit 1153, and may control the communication unit 1151 to transmit a PRU dynamic signal in order to report the power information.

[0129] In addition, a node 1156 connected to the wireless power integrated circuit 1154 may be connected to a travel adapter 1158. In the case where the wired charging connector is inserted into the travel adapter 1158, a predetermined voltage (e.g., 5V) may be applied to the node 1156. The wireless power integrated circuit 1154 may monitor the voltage applied to the node 1156 to thereby determine whether the travel adapter is inserted.

[0130] As mentioned above, reference has been made Figures 1 to 11 The concept of a wireless charging system that can be applied to embodiments of the present invention is described. Figure 12 to Figure 14 A power distribution method for wireless charging according to an embodiment of the present invention is described.

[0131] Fig.12 is a view showing a power distribution method for a plurality of wireless power receivers according to a first embodiment of the present invention.

[0132] Fig.12 It is shown that the available charging power of the PTU 1200 is 10 W and the maximum required power of the PRU1 1210 is 7 W under the assumption that the efficiency of the resonator is 100%. When the PTU 1200 receives the message including the maximum required power information and the limit power information of the PRU1 1210, the PTU 1200 may transmit the maximum required power to the PRU1 1210 because the PTU 1200 can provide the maximum required power. In addition, the PTU 1200 may deliver the power transmission information to the PRU1 1210.

[0133] Subsequently, when PRU2 1220 is additionally added, a connection may be made through BLE ADV, and the PTU 1200 may receive maximum required power information and limited power information of PRU2 1220 from PRU2 1220. The PTU 1200 may calculate the amount of power to thereby determine power reallocation.

[0134] In this case, since the limit power of each of PRU1 1210 and PRU2 1220 is 5 W, the PTU 1200 may allocate 5 W of power to each of PRU1 1210 and PRU2 1220 even if the maximum required power thereof is 7 W. Here, the maximum required power indicates the maximum power that can be received by the PRU, and the limit power indicates the minimum power that can be received by the PRU. For example, if the limit power of PRU1 1210 is 5 W, it means that PRU1 1210 can receive all powers of 5 W to 7 W. Alternatively, the limit power may be configured step by step. For example, if the limit power of PRU1 1210 is configured as 10 W=>5 W=>3 W, it means that PRU1 1210 can receive only powers corresponding to 10 W, 5 W, and 3 W, respectively, from the PTU 1200.

[0135] Accordingly, when PRU2 1220 is newly added, PTU 1200 reduces the power for PRU1 1210 from 10 W to 5 W because PTU 1200 cannot send the maximum required power of PRU2 1220. Therefore, PTU 1200 may instruct PRU2 1220 to perform charging at 5 W. Alternatively, PTU 1200 may notify PRU2 1220 of available power based on phased limiting power information of PRU2 1220. Accordingly, PRU2 1220 may adjust the limiting power.

[0136] The PTU 1200 may receive such a limited power through a message received from each of the PRU1 1210 and PRU2 1220 after being connected to the PRU1 1210 and PRU2 1220, respectively. The message may be sent in a preparation phase before sending power and may contain requirements of the PRU. These requirements may contain fixed values, such as maximum required power information, phased limited power, or fixed limited power, for example. The message may be sent through a communication channel between the PTU and the PRU.

[0137] In addition, if various situations that require power adjustment occur in PRU1 1210 and PRU2 1220, the message is also sent to PTU 1200. PTU 1200 can receive the message and re-adjust the power to a new value according to the situation (for example, when the number of PRUs is changed, when a specific PRU is fully charged, when the charging mode of the PRU is changed, or when charging is released). For example, if the temperature increases excessively, the current flows too much, or the voltage is too high during charging, the PRU can re-adjust the power to a new value. RECT Sent to PTU to control charging power accordingly.

[0138] In addition, in another embodiment, if the charging mode of the PRU is switched from CC (continuous current) mode to CV (continuous voltage) mode, or if charging is completed in CV mode, no more power is required to be sent, so the PTU can dynamically adjust the power value for each PRU to redistribute the charging power.

[0139] The PTU 1200 may transmit current charging power information to the PRU1 1210 and the PRU2 1220. For example, the PTU 1200 may provide the PRU1 1210 and the PRU2 1220 with information stating that the PTU 1200 transmits 5 W of power to each of the PRU1 1210 and the PRU2 1220.

[0140] Fig.13 is a view showing a power distribution method for a plurality of wireless power receivers according to a second embodiment of the present invention.

[0141] Fig.13 An example is shown in which power adjustment is required due to CV charging completion, CV mode switching, or removal of the charger in PRU2 1320 while the available charging power of PTU 1300 is 10W and PRU1 1310 is charging in CC mode. For example, if the charging mode of PRU2 1320 is switched from CC mode to CV mode, or if charging is completed in CV mode, transmission of more power is unnecessary. In addition, when PRU2 1320 is beyond the charging range of PTU 1300, that is, if PRU2 1320 is removed from PTU 1300, power transmission is unnecessary. When power transmission to PRU2 1320 is unnecessary according to such various situations, PTU 1300 may recalculate the charging power supply capacity to be supplied then. Accordingly, PTU 1300 may convert the limited power that has been supplied to PRU1 1310 into the maximum required power to be supplied then. For example, assuming that the maximum required power of the PRU1 1310 is 7 W and the limited power thereof is 5 W, the PTU 1300 may increase the power from 5 W, which has been supplied to charge the PRU1 1310 , to 7 W to thereby perform charging.

[0142] In this state, if a PRU is additionally added, the PTU 1300 may calculate the amount of power. If, as a result of the calculation, the PTU 1300 determines that the PTU 1300 cannot transmit the limited power required by the PRU being charged by reallocating power, the PTU 1300 may reject the newly added PRU. That is, the additionally added PRU may not be charged.

[0143] At this time, a method for converting the limited power into the maximum required power is as follows.

[0144] First, the PTU 1300 may send a load switch disconnection command to the PRU1 1310. Accordingly, the PRU1 1310 disconnects the load switch to thereby perform a reset. Then, the PTU 1300 may control power again with respect to the PRU1 1310 to thereby perform charging. Here, as an implementation issue of the PRU configuration algorithm, in order to reduce a sudden change in the voltage of the PRU1 1310, the PRU1 1310 may be disconnected first, and then the PRU2 may be turned on.

[0145] Fig.14 is a view showing a power distribution method for a plurality of wireless power receivers according to a third embodiment of the present invention.

[0146] Fig.14 An example is shown in which the available charging power of the PTU 1400 is 5 W, the maximum required power of the PRU1 1410 is 7 W, and the limited power thereof is 5 W. In this case, even if the available charging power 5 W of the PTU 1400 is less than the maximum required power 7 W of the PRU1 1410, charging can be performed because the available charging power of the PTU 1400 satisfies the limited power 5 W of the PRU1 1410.

[0147] Accordingly, if it is determined that the PTU 1400 cannot provide the maximum required power of the PRU1 1410, the PTU 1400 may check the limited power of the PRU1 1410 and may notify the available power of the PTU 1400. Then, the PRU1 1410 may adjust the required power. In this method of the PRU, for example, the PTU may adjust the setting, or the PRU may set the required power to then receive an input of the charging current.

[0148] As described above, when the PTU receives the limit power information and / or reduce power information from the PRU, the PTU determines the power supply to the PRU.

Claims

1. A method for controlling a wireless power transmitter, the method comprising: outputting, by a power transmission circuit of the wireless power transmitter, a first power for charging the first wireless power receiver; receiving power information of the second wireless power receiver through the communication circuit of the wireless power transmitter while outputting a first power for charging the first wireless power receiver, wherein the power information of the second wireless power receiver includes information about a maximum power of the second wireless power receiver; identifying, by a controller of the wireless power transmitter, that the wireless power transmitter is unable to support a maximum power of the second wireless power receiver; Based on identifying that the wireless power transmitter cannot support the maximum power of the second wireless power receiver, sending a power adjustment command to the second wireless power receiver through the communication circuit, wherein the power adjustment command is used to reduce the amplitude of the power received by the second wireless power receiver to an amplitude within the range that the wireless power transmitter can support; and Based at least on the reduced power amplitude, second power for charging the first wireless power receiver and the second wireless power receiver is output through the power transmission circuit.

2. The method according to claim 1, wherein: The power information also includes limited power information.

3. The method according to claim 1, further comprising: Before outputting the first power for charging the first wireless power receiver, power information including information on a maximum power of the first wireless power receiver is received through the communication circuit.

4. The method according to claim 3, wherein: Identifying that the wireless power transmitter cannot support the maximum power of the second wireless power receiver includes: Identifying that a maximum power provided by the wireless power transmitter is less than a sum of a maximum power of the first wireless power receiver and a maximum power of the second wireless power receiver.

5. The method according to claim 1, further comprising: After outputting the second power for charging the first wireless power receiver and the second wireless power receiver, a communication signal is transmitted through the communication circuit to initiate wireless reception power to the second wireless power receiver.

6. The method according to claim 1, further comprising: In response to informing the second wireless power receiver to reduce power drawn by the second wireless power receiver, adjusted power information is received from the second wireless power receiver.

7. The method according to claim 1, further comprising: When a charging mode of at least one of the first wireless power receiver and the second wireless power receiver is changed, second powers for the first wireless power receiver and the second wireless power receiver are recalculated and provided.

8. The method according to claim 1, further comprising: Based on identifying that the wireless power transmitter cannot support the maximum power of the second wireless power receiver, notifying the first wireless power receiver through the communication circuit to reduce a first power drawn by the first wireless power receiver.

9. A wireless power transmitter, comprising: a power transmission circuit configured to output a first power for charging a first wireless power receiver; Communication circuits; and The processor is configured as: receiving power information of a second wireless power receiver through a communication circuit while transmitting a first power for charging the first wireless power receiver, wherein the power information of the second wireless power receiver includes information about a maximum power of the second wireless power receiver, identifying that the wireless power transmitter cannot support the maximum power of the second wireless power receiver, Based on identifying that the wireless power transmitter cannot support the maximum power of the second wireless power receiver, sending a power adjustment command to the second wireless power receiver through the communication circuit, wherein the power adjustment command is used to reduce the amplitude of the power drawn by the second wireless power receiver to a level within the range that the wireless power transmitter can support, and Based at least on the reduced power amplitude, second power for respectively charging the first wireless power receiver and the second wireless power receiver is output through the power transmission circuit.

10. The wireless power transmitter according to claim 9, wherein: The power information also includes limited power information.

11. The wireless power transmitter according to claim 9, wherein: The processor receives power information including information about a maximum power of the first wireless power receiver through the communication circuit before outputting first power for charging the first wireless power receiver.

12. The wireless power transmitter according to claim 11, wherein: The processor is further configured to identify whether a maximum power provided by the wireless power transmitter is less than a sum of a maximum power of the first wireless power receiver and a maximum power of the second wireless power receiver.

13. The wireless power transmitter according to claim 9, wherein: The processor is further configured to, after outputting the second power for charging the first and second wireless power receivers, transmit a communication signal through the communication circuit to initiate wireless reception power to the second wireless power receiver.

14. The wireless power transmitter according to claim 9, wherein: The processor is further configured to recalculate second power for the first wireless power receiver and the second wireless power receiver and provide the second power when a charging mode of at least one of the first wireless power receiver and the second wireless power receiver is changed.

15. The wireless power transmitter according to claim 9, wherein: The processor is further configured to notify the first wireless power receiver through the communication circuit to reduce power drawn by the first wireless power receiver based on identifying that the wireless power transmitter cannot support the maximum power of the second wireless power receiver.

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