Electronic device for wirelessly charging external devices

Abstract

The present disclosure relates to an electronic device, including a display, a conductive coil, a wireless charging circuit electrically connected to the conductive coil, a power management circuit, a battery; and a processor, wherein the processor can be configured to control the electronic device: when power is transmitted to an external device through the conductive coil, measure the current flowing from the power management circuit to the wireless charging circuit, and based on the current value being between a first threshold and a second threshold greater than the first threshold, adjust the power transmitted to the external device through the conductive coil based on a portion of the preset amount of power in a signal requesting an increase in power.

Description

Technical Field

[0001] The present disclosure relates to a method of wirelessly transmitting power to an external device and an electronic device supporting the method. Background Art

[0002] An electronic device such as a smartphone or tablet computer may include an internal battery that is charged by an external power source. Recently, an electronic device has been released that supports a wireless charging method that is wirelessly powered by an internal coil and a wired charging method that is powered by a wire. The wired charging scheme may be a method in which a user directly connects a travel adapter (TA) and a charging device through a connector to charge the battery. The wireless charging method may be a method in which power is transferred between a coil in a wireless charging pad and a coil in an electronic device when a user places the electronic device on the wireless charging pad.

[0003] Recently, a technology for wirelessly transmitting power between terminals has been developed. For example, when the rear case of a device with high battery power and the rear case of a device with low battery power are in close contact with each other, power can be wirelessly transmitted between the devices.

[0004] The above information is presented as background information only to assist in understanding the present disclosure. No determination has been made, and no assertion has been made, as to whether any of the above information may be applicable as prior art with respect to the present disclosure. Summary of the invention

[0005] Technical issues

[0006] In the case of wirelessly transmitting power between electronic devices according to the prior art, the maximum power output from the power supply circuit (e.g., PMIC) in the first electronic device that transmits power can be determined at the design stage (e.g., about 7.5W). When the power required by the wireless charging circuit (e.g., MFC IC) in the first electronic device exceeds the maximum power that the power management circuit (e.g., PMIC) can provide, the protection circuit in the power management circuit works to wirelessly charge the battery. You will not be able to power on the circuit. In this case, wireless charging disconnection occurs.

[0007] For example, when the arrangement state of the first electronic device and the second electronic device is not suitable for wireless charging (e.g., misalignment), or the housing of the first electronic device or the second electronic device is relatively thick. The power required by the second electronic device may increase. In response to this, the power required by the wireless charging circuit (e.g., MFC IC) in the first electronic device is increased, and wireless charging may be interrupted.

[0008] Technical Solution

[0009] Embodiments of the present disclosure solve at least the above problems and / or disadvantages and provide at least the following advantages. Therefore, an exemplary aspect of the present disclosure is to provide an electronic device that stably supports device-to-device wireless charging based on current flowing from a power circuit to a wireless charging circuit.

[0010] According to an exemplary aspect of the present disclosure, an electronic device may include: a display having at least a portion of the display visible through a first surface of the electronic device; a conductive coil disposed between the display and a second surface opposite the first surface in the electronic device; a wireless charging circuit electrically connected to the conductive coil; a power management circuit connected to the wireless charging circuit; a battery connected to the power management circuit; and a processor operatively connected to the display and the power management circuit. The processor is configured to control the electronic device to measure a current flowing from the power management circuit to the wireless charging circuit when power passes through the conductive coil, and based on the current value being between a first threshold and a second threshold greater than the first threshold, adjust the power transmitted to the external device through the conductive coil based on a portion of the power amount preset in the signal requesting an increase in power.

[0011] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various example embodiments of the disclosure.

[0012] Beneficial Effects

[0013] The electronic device according to the embodiments disclosed herein may measure input current and supply power in various ways according to the input current, thereby supporting stable device-to-device wireless charging.

[0014] Before the charging current flowing from the internal power management circuit (e.g., PMIC) to the wireless charging circuit (e.g., MFC IC) reaches the maximum allowable current value, the electronic device according to the embodiments disclosed herein can gradually adjust the charging power state to stably support device-to-device wireless charging.

[0015] Even in a misaligned state, or even when a housing of the first electronic device or the second electronic device is relatively thick, the electronic device according to the embodiments disclosed herein can stably support device-to-device wireless charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent through the following detailed description in conjunction with the accompanying drawings, in which:

[0017] Figure 1 is a diagram illustrating example wireless power transmission between devices according to various embodiments;

[0018] Figure 2 is a diagram illustrating an example of wirelessly sharing power between a first electronic device and a second electronic device according to various embodiments;

[0019] Figure 3 is a cross-sectional view illustrating an example electronic device according to various embodiments;

[0020] Figure 4 is a block diagram showing an example configuration of a charging circuit in an electronic device according to various embodiments;

[0021] Figure 5 is a circuit diagram illustrating example wireless charging of each of a first electronic device and a second electronic device according to various embodiments;

[0022] Figure 6 is a signal flow diagram illustrating example operations of an electronic device and an external device according to various embodiments;

[0023] Figure 7a is a flow chart illustrating an example device-to-device wireless power transfer method according to various embodiments;

[0024] Figure 7b is a flowchart illustrating example operations in a power limiting mode according to various embodiments;

[0025] Figure 7c is a flowchart illustrating example operations in a step change mode and a power limit mode according to various embodiments;

[0026] Figure 8 is a diagram illustrating an example mode change according to a measured charging current according to various embodiments;

[0027] Fig. 9 is a flow chart illustrating an example wireless charging method of a second electronic device type according to various embodiments;

[0028] Fig.10 is a flow chart illustrating an example method of identifying a second electronic device type during a device-to-device wireless charging process according to various embodiments;

[0029] Fig.11 is a flowchart illustrating an example of a change in a power condition according to connection of an external power source according to various embodiments; and

[0030] Fig.12 is a block diagram illustrating example electronic devices in a network environment according to various embodiments. DETAILED DESCRIPTION

[0031] Figure 11 is a diagram showing an example wireless power transmission between devices according to various embodiments. In the following, a description will be given based on a case where the first electronic device 101 is a device for transmitting wireless power (TX device) and the second electronic device 102 is a device for receiving wireless power (RX device), but the present disclosure is not limited thereto.

[0032] refer to Figure 1 , the first electronic device 101 can charge the second electronic device 102 through wireless power transmission. For example, when the battery 223 (for example, see Figure 2 ) is discharged or the remaining battery level is less than or equal to a specified value, the rear case of the first electronic device 101 and the rear case of the second electronic device 102 may be arranged to be in contact with each other or spaced within a specified distance from each other (e.g., within about 0.5 cm), and the first electronic device 101 may wirelessly supply power to the second electronic device 102. The second electronic device 102 may charge the battery in the second electronic device 102 using the wirelessly received power.

[0033] For example, when current flows through the first conductive coil in the first electronic device 101, an induced current may flow through the second conductive coil in the second electronic device 102. The battery in the second electronic device 102 may be charged by the induced current.

[0034] According to various embodiments, the first electronic device 101 can adjust the power wirelessly transmitted to the second electronic device 102 based on various information, such as, for example but not limited to, whether an external power source is connected, the device type of the second electronic device 102, identification information, a signal received from the second electronic device 102, etc.

[0035] Although the second electronic device 102 is a smart phone, Figure 1 , but the present disclosure is not limited thereto. For example, the second electronic device 102 may be a wearable device such as a smart watch, but the present disclosure is not limited thereto.

[0036] Figure 2 is a diagram showing an example of wirelessly sharing power between a first electronic device and a second electronic device. Figure 2 In FIG. 1 , both the first electronic device 201 and the second electronic device 202 are described as devices capable of transmitting / receiving wireless power, but one of the two devices may be an electronic device capable of only receiving wireless power.

[0037] In the present disclosure, a description will be given assuming that the first electronic device 201 is a host device and the second electronic device 202 is an external electronic device, however, the second electronic device 202 may have the same configuration as the first electronic device 201 or a configuration with only the wireless power transmission function removed, and the present disclosure is not limited thereto.

[0038] The operation or function of the controller (e.g., including a processing circuit) 211, power management circuit 212, battery 213, wireless charging circuit 214 and / or coil 215 of the first electronic device 201 may be the same as or similar to the operation or function of the coil 225, wireless charging circuit 224, PMIC 222 (power management IC), battery 223 or controller (e.g., including a processing circuit) 221 (controller) of the second electronic device 202.

[0039] According to an example, the first electronic device 201 may include a controller 211, a power management circuit 212, a battery 213, a wireless charging circuit 214, and / or a coil 215. The first electronic device 201 may be connected to an external device through an external connection terminal 203 (eg, USB).

[0040] According to an embodiment, the coil 215 may be spirally formed in the FPCB. According to an example, the wireless charging circuit 214 may include a full-bridge circuit. For example, the wireless charging circuit 214 may perform control so that the full-bridge circuit is driven as an inverter (DC→AC) in the wireless power transmission operation and the full-bridge circuit is driven as a rectifier (AC→DC) in the wireless power reception operation.

[0041] According to an embodiment, the wireless charging circuit 214 may exchange information required for wireless power transmission with the second electronic device 202 through, for example, in-band communication according to the WPC standard. For example, in-band communication may refer to, for example, a scheme in which, in the case of wireless power transmission between the coil 215 and the coil 225, data may be exchanged between the first electronic device 201 and the second electronic device 202 by modulating the frequency or amplitude of the wireless power transmission signal. According to various embodiments, out-of-band communication may be used as communication between the first electronic device 201 and the second electronic device 202. For example, out-of-band communication is different from a wireless power signal and may be short-range communication such as, for example, but not limited to, near field communication (NFC), Bluetooth, WiFi, etc.

[0042] According to an example, the power management circuit (e.g., PMIC 212) may include, for example, but not limited to, a charger function for charging the battery 213 through wired and wireless input power, a function of performing communication (e.g., USB battery charging specifications, USB power delivery (PD) communication, AFC communication, and / or quick charging (QC) communication) with an external power source (e.g., a travel adapter) connected to a USB segment, a function of providing required power to the system, a function of supplying power corresponding to the required voltage level of each terminal, and / or a function of supplying power to the wireless charging circuit 214 in a wireless power transfer mode, and the like.

[0043] According to an embodiment, the external connection terminals 203 and 204 may be, for example, terminals that comply with the USB standard. For example, the external connection terminals 203 and 204 may be interfaces for USB charging and / or OTG (on the go, digital companion) power supply. According to an embodiment, the external connection terminals 203 and 204 may be connected to an external power source (TA, battery pack, etc.).

[0044] According to an example, according to the situation of the first electronic device 101, the controller 211 may include various processing circuits and integrated controls, such as but not limited to, wired and wireless charging of the first electronic device 101, USB communication with the second electronic device 202, and / or communication with the second electronic device 202 (e.g., USB PD, BC1.2 (Battery Charging (Revision) 1.2), AFC and / or QC), etc. For example, BC1.2 or PD may be an interface for communicating with an external power source (TA), and the controller 211 may control the communication with the external power source. For example, the situation of the first electronic device 201 may include but is not limited to the temperature of the first electronic device 201 and / or the capacity of the battery 213 of the first electronic device 201, etc.

[0045] According to various embodiments, the first electronic device 201 can operate in a wireless power transmission mode (Tx mode) using the battery 213. When a wired power supply device is connected, the first electronic device 201 can preferentially use an external power supply in the wireless power transmission mode (Tx mode) and charge the battery 213 with the remaining power.

[0046] In the present disclosure, an electronic device (e.g., Figure 2 The operation of the first electronic device 201 in the wireless power transmission mode (Tx mode) may refer to, for example, the electronic device transmitting power to an external electronic device (eg, Figure 2 In the present disclosure, an electronic device (eg, Figure 2 The operation of the second electronic device 202 in the wireless power receiving mode (Rx mode) may refer to, for example, receiving power from an external electronic device (eg, Figure 2 The first electronic device 201) receives wireless power and uses the received wireless power to charge the battery 223.

[0047] According to various embodiments, when wirelessly supplying power to the second electronic device 202, the first electronic device 201 may compare the current flowing from the power management circuit 212 in the first electronic device 201 to the wireless charging circuit 214 with a plurality of thresholds and set an environment related to wireless power transmission. According to an embodiment, a plurality of thresholds may be set in the power management circuit 212 based on the maximum allowable current value set for device protection (see Figure 5 , Figure 6 , Figure 7a , Figure 7b , Figure 7c , Figure 8 , Fig. 9 , Fig.10 , Fig.11 and Fig.12 ).

[0048] Figure 3 is a cross-sectional diagram illustrating an example electronic device according to various embodiments. Figure 3 is along Figure 2 A cross-sectional view of the first electronic device 201 taken along line AA′ is shown.

[0049] refer to Figure 3 , the electronic device 300 (for example, Figure 1 The first electronic device 101 or the second electronic device 102 may include a housing 305 for accommodating and fixing one or more components, and a cover 309 fixed to the housing 305 at the rear side of the electronic device 300. For example, the components may include a display panel 311, a substrate 301, a battery 307, a camera 303, and / or an FPCB 315 located in the housing 305.

[0050] According to an example, the display panel 311 may be arranged on the front surface of the electronic device, and the glass (window cover) 324 may be attached to its top surface. According to an embodiment, the display panel 311 may be formed integrally with a touch sensor or a pressure sensor. According to another embodiment, the touch sensor or the pressure sensor may be separated from the display panel 311. For example, the touch sensor may be arranged between the glass 324 and the display panel 311.

[0051] According to an example, the substrate 301 may include components such as, for example but not limited to, a communication module or a processor mounted thereon. According to an example, the substrate 301 may be implemented using at least one of a printed circuit board (PCB) or a flexible printed circuit board (FPCB). According to an example, the substrate 301 may operate as a grounding plate capable of grounding the loop antenna 317.

[0052] According to an example, the cover 309 may be divided into a conductive area including a conductive material and a non-conductive area including a non-conductive material. For example, the cover 309 may be divided into a conductive area and a non-conductive area located on one side or both sides of the conductive area. According to an example, at least one opening 321 may be formed in the cover 309 to expose some components of the electronic device 300 to the outside. For example, the cover 309 may include one or more openings 321 for a camera 303, a flash, or a sensor (e.g., a fingerprint sensor), etc., but the present disclosure is not limited thereto.

[0053] According to an example, the FPCB 315 may be connected to the bottom of the cover 309. According to an example, the FPCB 315 may be equipped with one or more loop antennas 317 and may be positioned to be electrically insulated from a conductive area of ​​the cover 309.

[0054] According to an example, the one or more loop antennas 317 may be of the same type as each other. For example, the one or more loop antennas 317 may be planar coils. According to another embodiment, some of the one or more loop antennas 317 may be planar coils, while others may be solenoid coils.

[0055] According to an example, the one or more loop antennas 317 may include a wireless charging coil, and the wireless charging coil may be in a spiral pattern.

[0056] According to an example, a magnetic field shielding layer (shielding sheet 322 and graphite sheet 323) may be provided in one direction of one or more loop antennas 317. For example, the magnetic field shielding layer (shielding sheet 322 and graphite sheet 323) may concentrate the direction of the magnetic field caused by the coil in the back direction of the electronic device 300 (e.g., Figure 3 , and suppressing the formation of a magnetic field in the electronic device 300 to prevent and / or reduce abnormal operation of other electronic components.

[0057] Figure 4 is a block diagram illustrating an example configuration of a charging circuit in an electronic device according to various embodiments.

[0058] refer to Figure 4 , according to various embodiments, the electronic device 401 (eg, Figure 1 The electronic device 101 may include a battery 410, a system 420, a wired interface 421, a wireless interface 425 and / or a charging circuit 430.

[0059] According to an example, the battery 410 may be mounted on a housing (eg, Figure 3 The battery 410 may include, for example, a lithium-ion battery, a rechargeable battery, and / or a solar cell, but is not limited thereto.

[0060] According to an example, the wired interface 421 and the wireless interface 425 may be mounted on a portion of the housing of the electronic device 401 and may be connected to an external device separately. The wired interface 421 may include, for example, a universal serial bus (USB) connector 421-1, and may be connected to the first external device 402 through the connector 421-1. The wired interface 421 may be an interface for USB charging and / or on-the-go (OTG) power supply, or may be connected to an external power source (TA, battery pack, etc.). The wireless interface 425 may include a coil 425-1 (also referred to as a "conductive pattern") (e.g., Figure 3 One or more loop antennas 317) and a TRX IC (transmit / receive integrated chip) 425-2, and wirelessly transmit and receive power with the second external device 403 through the conductive pattern 425-1 and the TRX IC 425-2. Wireless power can be transmitted and received using, for example, but not limited to, a magnetic field induction coupling method, a resonance coupling method, a wireless power transmission method that mixes the two methods, etc. According to an example, the conductive pattern 425-1 may include a first conductive pattern for transmitting wireless power and a second conductive pattern for receiving wireless power.

[0061] According to an example, the first external device 402 may be an externally wired external device, and may be a wired power supply device or a wired power receiving device. The wired power receiving device may be an on-the-go (OTG) device. The OTG device may be a device connected to the electronic device 401 to receive power, such as a mouse, keyboard, USB memory, and accessories. In this case, the electronic device 401 may operate in an OTG mode that provides external power to the USB terminal.

[0062] The wired power supply device may be a device such as a travel adapter (TA) that is connected to the electronic device 401 in a wired manner to supply power to the electronic device 401. The wired power receiving device may be wiredly connected to the electronic device to receive power from the electronic device and use the power as an internal power source, and may charge another battery included in the wired power receiving device.

[0063] According to an example, the first external device 402 connected to the electronic device 401 through the wired interface 421 may include a wired high voltage (HV) device (e.g., a device supporting USB power transmission (PD), adaptive fast charging (AFC), or quick charging (QC)). When the wired HV device is connected to the connector, the electronic device 401 can provide power at a voltage (e.g., 9V) higher than the voltage (e.g., 5V) provided from the battery 410, or receive power from the wired HV device.

[0064] According to an example, the second external device 403 may include a wireless power supply device or a wireless power receiving device. According to various embodiments, the wireless power supply device may include a device for providing wireless power to an electronic device using a first conductive pattern (such as a wireless charging pad). The wireless power receiving device may include a device for receiving wireless power supplied from an electronic device using a second conductive pattern and charging another battery included in the wireless power receiving device using the received power.

[0065] According to an example, the second external device 403 connected to the electronic device 401 through the wireless interface 425 may include a wireless high voltage (HV) device (e.g., a device supporting USB power transmission (PD), adaptive fast charging (AFC), or quick charging (QC)). According to an example, the wireless HV device may include a wireless charging pad that supports fast charging. The wireless charging pad may communicate with the TRX IC 425-2 through in-band communication, using a separate communication module (Bluetooth or Zigbee) to determine whether to perform fast charging. For example, the electronic device 401 may request the wireless charging pad to perform charging at a high voltage (HV) such as 9V through the TRX IC 425-2, and the wireless charging pad may determine whether fast charging is possible by communicating with the electronic device 401 when the electronic device 401 requests HV charging. When it is determined that fast charging is possible, the wireless charging pad may supply power to the electronic device 401 based on 9V.

[0066] According to an example, the charging circuit 430 may be electrically connected to the battery 410 , and may connect the wired interface 421 and the wireless interface 425 , the battery 410 and the wired interface 421 , and the battery 410 and the wireless interface 425 .

[0067] The charging circuit 430 may be configured to electrically connect the battery 410 and the coil 425-1 (e.g., the first conductive pattern) to wirelessly transmit power to the second external device (e.g., the wireless power receiving device), and at the same time, electrically connect the battery 410 and the connector to wiredly transmit power to the first external device (e.g., the wired power receiving device). For example, the charging circuit 430 may convert the first power generated by the battery 410 into a second power higher than the first power, transmit the third power as at least a part of the second power to the wireless power receiving device via the coil 425-1 (e.g., the first conductive pattern), and transmit the fourth power as at least another part of the second power to the OTG device or the wired power receiving device via the connector.

[0068] According to an example, the charging circuit 430 may include an interface controller 429 , a first switch 432 , a second switch 434 , a control logic 436 , a switch group 438 , and / or a charging switch 439 .

[0069] According to an example, the interface controller 429 may include various control / processing circuits, and determine the type of the first external device 402 connected to the wired interface 421, and determine whether fast charging is supported by communicating with the first external device 402 through adaptive fast charging (AFC). According to an example, the interface controller 429 may include a micro USB interface IC (MUIC) or a fast charging (e.g., USB power transmission (PD), adaptive fast charging (AFC), or quick charging (QC)) interface. For example, the MUIC may determine whether the first external device 402 connected to the wired interface 421 is a wired power supply device or a wired power receiving device. For example, the fast charging interface may determine whether fast charging is supported by communicating with the first external device 402. When fast charging is supported, the first external device 402 may increase the sending and receiving power. For example, the first external device 402 may be a wired power supply device that typically transmits 10W (about 5V / 2A) of power, and when fast charging is supported, transmits 15W (about 9V / 1.6V) of power.

[0070] According to an example, the first switch 432 may include at least one switch and control the power output to the device (e.g., OTG device) connected through the wired interface 421 or the wired power supply device and the power input from the wired power supply device. For example, the first switch 432 may be operated in an on state so that power is output to the OTG device or the wired power receiving device and is input from the wired power supply device, or may be operated in an off state so that power is not output to the OTG device or the wired power receiving device and is not input from the wired power supply device.

[0071] According to an example, the second switch 434 may include at least one switch and control the power input and output with respect to the wireless power supply device and the wireless power receiving device through the wireless interface 425 (e.g., the conductive pattern 425-1 and the TRX IC 425-2). For example, the second switch 434 may be operated in an on state so that power is input and output with respect to the wireless power supply device or the wireless power receiving device, or may be operated in an off state so that power is input and output with respect to the wireless power supply device or the wireless power receiving device.

[0072] According to an example, the control logic 436 can perform control to convert the power input from at least one of the first switch 432 and the second switch 434 into a charging voltage and a charging current suitable for charging the battery 410, perform control to convert the power from the battery 410 into a charging voltage and a charging current suitable for charging an external device (e.g., the first external device 402 or the second external device 403) connected to each of the first switch 432 and the second switch 434, or perform control to convert the power from the battery 410 into a voltage and a current suitable for use in an external device.

[0073] According to various embodiments, the control logic 436 may perform a charging current sensing function, a charging cut-off function, a CC loop (constant current loop) function, a CV loop (constant voltage loop) function, a termination current loop function, a recharging loop function, and / or a bat to Sys FET (battery to system FET) loop function. The charging current sensing function may include a function of detecting the amount of charging current. The charging cut-off function may include a function of stopping charging the battery 410 in the event of overcharging or overheating. The CC loop function may include a function of controlling a constant current (CC) portion in which the charging current is kept constant. The CV loop function may include a function of controlling a constant voltage (CV) portion in which the charging voltage is kept constant. The terminal current loop function may include a function of controlling the charging terminal. The recharging loop function may include a function for controlling recharging. The Bat to Sys (battery to system) FET loop function may include a function of controlling the voltage and current between the battery 410 and the system.

[0074] According to various embodiments, the control logic 436 may perform control so that the charging circuit 430 selectively transmits the power of the battery 410 to the outside wirelessly or wired. The control logic 436 may also perform control so that power is transmitted to the first external device 402 and / or the second external device 403 through the charging circuit 430, or power is received from the first external device 402 and / or the second external device 403.

[0075] According to various embodiments, the control logic 436 may perform control so that when a wired power supply device is connected, the battery 410 is charged using the power received from the wired power supply device. In addition, the control logic 436 may perform control to perform an OTG function when an OTG device is connected. In addition, the control logic 436 may perform control so that when a wireless power supply device is connected, the battery 410 is charged by receiving power from the wireless power supply device. In addition, when the wireless power supply device and the OTG device are connected, the control logic 436 may perform control to perform the OTG function while charging the battery by receiving power from the wireless power supply device. In addition, the control logic 436 may perform control so that when a wireless power receiving device is connected, the wireless power receiving device is powered by using the power of the battery 410. In addition, when the wired power supply device and the wireless power receiving device are connected, the control logic 436 may perform control to receive power from the wired power supply device to charge the battery 410 and simultaneously power the wireless power receiving device. In addition, the control logic 436 may perform control to perform an OTG function when the OTG device and the wireless power receiving device are connected, and simultaneously supply power to the wireless power receiving device using power of the battery.

[0076] According to an example, the switch group 438 may boost or buck the power of the battery 410 to provide a constant current to a system (e.g., a system 420 that powers each module of an electronic device) or to provide a constant current to a connected external device, or boost or buck the charging voltage to provide a constant charging current to the battery 410. According to an example, the switch group 438 may include a buck / boost converter.

[0077] According to an example, the charging switch 439 may detect the amount of charging current, and may cut off charging of the battery 410 when overcharging or overheating occurs.

[0078] According to an example, the electronic device 401 may include a display (not shown). The display may display a user interface configured to control at least a portion of the charging circuit 430. The display may receive a user input for wirelessly or wirelessly transmitting power from the battery 410 to an external device. The display may display at least one or more external devices connected to the electronic device 401, may display the remaining battery capacity of the connected external device, or may display an indication of whether power is supplied from a connected external device or received from a connected external device. The display may display a screen for controlling the power distribution provided to multiple external devices when multiple external devices are connected and power is supplied to each of the multiple external devices, and may display a screen for selecting the power supply priority of multiple external devices. In addition, the display may display a screen representing information on the display of the connected external device. At least a portion of the content displayed on the display may change according to a signal received from the connected external device.

[0079] Figure 5 is a circuit diagram illustrating an example wireless charging of each of a first electronic device and a second electronic device according to various embodiments. Figure 5 It is illustrative only, and the present disclosure is not limited thereto.

[0080] refer to Figure 5 , the first electronic device 501 (for example, Figure 1 The first electronic device 101 may include a processor (eg, including a processing circuit) 505, a battery 506, a first power management circuit 510 (eg, Figure 2 The power management circuit 212 in the wireless charging circuit 520 (for example, Figure 2 , and a first conductive coil 530 (eg, Figure 2 Coil 215).

[0081] The second electronic device 502 (eg, Figure 1 The second electronic device 102 may include a second conductive coil 540 (eg, Figure 2 The coil 225), the second wireless charging circuit 550 (for example, Figure 2 The wireless charging circuit 224), the second power management circuit 560 (for example, Figure 2 power management circuit 222), battery 566.

[0082] According to an example, the first power management circuit 510 may convert the power of the battery 506 into power required by the first wireless charging circuit 520, and transmit the required power to the first wireless charging circuit 520. The first power management circuit 510 may supply power to the first wireless charging circuit 520 through the wireless power terminal 511. The wireless power terminal 511 may be applied with a specified charging voltage Vout, and may be set so that the charging current Iout flows within a specified maximum allowable current value based on the specified charging voltage Vout. The maximum allowable current value may be a value set to protect the first power management circuit 510. When the charging current Iout exceeds the maximum allowable current value, the first power management circuit 510 may block the charging current Iout. Therefore, device-to-device wireless charging may be stopped. Considering the characteristics of the first electronic device 501, the characteristics of the second electronic device 502, power transmission conditions, etc., the maximum allowable current value may be set to various values.

[0083] According to various embodiments, when the external power source 503 may be connected to the external power terminal 512, the first power management circuit 510 may charge the battery 506. In an example, the first power management circuit 510 may transmit a portion of the power transmitted by the external power source 503 to the second electronic device 502 through wireless power transmission, and another portion of the power may be charged in the battery 506 or used in the first electronic device 501.

[0084] The first wireless charging circuit 520 may transmit power to the second conductive coil 540 of the second electronic device 502 through the first conductive coil 530. When current flows through the first conductive coil 530, an induced current may flow through the second conductive coil 540. Power may be transmitted to the second wireless charging circuit 550 and the second power management circuit 560 through the induced current, and the battery 566 may be charged.

[0085] Figure 6 is a signal flow diagram illustrating an example wireless charging between a first electronic device and a second electronic device according to various embodiments. Figure 6 is shown in more detail Figure 5 A diagram of an example operation sequence of a first electronic device 501 and a second electronic device (e.g., an external electronic device) 502 is shown. In the following, communication between the first electronic device 501 and the second electronic device 502 may be a signal transmission method (in-band method) through a coil of each device supporting wireless charging, but the present disclosure is not limited thereto.

[0086] Reference Figure 6, the first electronic device 501 and the second electronic device 502 may enter a first step (hereinafter referred to as a device detection step) 610. The device detection step may be a step in which the first electronic device 501 detects the second electronic device 502 before starting the wireless power transmission process (eg, a "ping phase").

[0087] In the device detection step, the first electronic device 501 may send a first signal for detecting the second electronic device 502 to the second electronic device 502. For example, the first signal may be a "digital ping". The second electronic device 502 having received the first signal may send a second signal for starting a wireless charging protocol to the first electronic device 501. For example, the second signal may be a "signal strength packet (SSP)". The SSP may be a packet indicating the presence of the second electronic device 502 in response to the digital ping. The SSP may include a value indicating the degree of inductive coupling between the conductive coils of the two electronic devices.

[0088] When the wireless charging process starts in response to the second signal sent by the second electronic device 502, the first electronic device 501 and the second electronic device 502 may enter the second step (hereinafter referred to as the device identification step) 620. The device identification step 620 may be a step in which the first electronic device 501 identifies the second electronic device 502 (e.g., an "identification and configuration phase"). In the device identification step, the second electronic device 502 may send a third signal to the first electronic device 501, which is a signal related to the identification of the second electronic device 502, and a fourth signal, which is a signal related to the power setting of the second electronic device 502. For example, the third signal may be an "identification package" (e.g., WPC version, Power Receiver Manufacturer Code (PRMC) and product code), and the fourth signal may be a "configuration package" (e.g., power level or maximum power). The first electronic device 501 may set the settings for wireless power transmission based on the received third and fourth signals.

[0089] When the second electronic device 502 is recognized and identified, the first electronic device 501 and the second electronic device 502 may enter a third step (hereinafter, also referred to as a power transmission step) 630. The power transmission step 630 may be a step in which the first electronic device 501 wirelessly transmits power to the second electronic device 502 (e.g., a "power transmission phase").

[0090] In the power transmission step 630, the second electronic device 502 may send a fifth signal requesting an increase or decrease in the power to be transmitted and a sixth signal indicating the power value received by the second electronic device 502 to the first electronic device 501. For example, the fifth signal may be a "control error packet (CEP)". When the first electronic device 501 receives the fifth signal, the first electronic device 501 may adjust the amount of transmitted (Tx) power in response to the fifth signal. The sixth signal may be a "received power packet". The sixth signal may be information about the power received by the second electronic device 502 through the wireless power transmission process.

[0091] Figure 7a is a flowchart illustrating an example device-to-device wireless power transmission method in various embodiments. Hereinafter, the operation of the first wireless charging circuit 520 may be an operation performed by an operating element (eg, MCU) or the processor 505 in the first wireless charging circuit 520.

[0092] refer to Figure 7a In operation 710, the first electronic device 501 (eg, Figure 1 The first power management circuit 510 of the first electronic device 101 can wirelessly transmit power received from the battery 506 (or the external power source 503 ) to the second electronic device 502 through the first wireless charging circuit 520 and the first conductive coil 530 .

[0093] According to an example, the first electronic device 501 and the second electronic device 502 can Figure 6 The device detection step 610 and the device identification step 620 enter the power transmission step 630, and wirelessly transmit and receive power.

[0094] In operation 720, the first wireless charging circuit 520 may measure the charging current Iout flowing from the first power management circuit 510 to the first wireless charging circuit 520 through the wireless power terminal 511. In an example, the first wireless charging circuit 520 may measure the charging current Iout in real time or at predetermined time intervals to use the charging current Iout for wireless power control.

[0095] In operation 730, the first wireless charging circuit 520 may determine whether the charging current Iout is less than or equal to a specified first threshold. In an example, the first threshold may be a value lower than the maximum allowable current value Iout_Max set in the first power management circuit 510. For example, the first threshold may be the maximum allowable current value (Iout_Max)*90%.

[0096] In operation 735, when the charging current Iout is less than or equal to (or less than) the first threshold value ("Yes" in operation 730), in response to the signal requesting an increase (or decrease) of power received from the second electronic device 502 ( Figure 6 In the fifth signal in the control error packet (e.g., “control error packet (CEP)”), the first wireless charging circuit 520 may operate in a mode (hereinafter referred to as a power adjustment mode) for changing a power condition (or power state) (e.g., charging voltage, maximum allowable current value (operating point) (e.g., charging voltage, maximum allowable current value, or frequency value)).

[0097] In the power adjustment mode, the first wireless charging circuit 520 may adjust the wireless Tx power corresponding to the fifth signal (e.g., "control error packet (CEP)") (hereinafter referred to as the power request signal) requesting an increase or decrease in the power to be transmitted. According to an example, when the power change amount with respect to the power request signal is preset, the first wireless charging circuit 520 may transmit the power request signal to the second electronic device 502 each time the power request signal is received.

[0098] In operation 740, when the charging current Iout exceeds the specified first threshold value (“No” in operation 730), the first wireless charging circuit 520 may determine whether the charging current Iout exceeds (or is greater than or equal to) a specified second threshold value greater than the first threshold value. In an example, the second threshold value may be a value equal to the maximum allowable current value Iout_Max set in the first power management circuit 510.

[0099] In operation 745 , when the charging current lout exceeds (or is greater than or equal to) a designated second threshold, the first wireless charging circuit 520 may operate in a mode (hereinafter referred to as a power limiting mode) in which the charging current lout is maintained.

[0100] In the power limiting mode, the first wireless charging circuit 520 may ignore the power request signal of the second electronic device 502. According to an example, a request for increasing power due to a CEP packet of the second electronic device 502 may be ignored. The first wireless charging circuit 520 may maintain the charging current Iout for wireless charging so that the wireless charging operation is not terminated.

[0101] According to an example, when the charging voltage Vout or the maximum allowed current value Iout_Max of the first power management circuit 510 changes, the first wireless charging circuit 520 may provide relevant information to the second electronic device 502 .

[0102] In operation 750 , when the charging current Iout is between the first threshold and the second threshold, the first wireless charging circuit 520 may operate in a mode for changing the wireless charging state in a stepwise manner (hereinafter referred to as a step change mode).

[0103] In the step change mode, the first wireless charging circuit 520 may increase only a portion of the power set in the power request signal in response to the power request signal of the second electronic device 502 .

[0104] According to various embodiments, the first wireless charging circuit 520 may also change the wireless charging state based on a voltage measured at the first power management circuit 510 and the wireless power terminal 511 to which the first wireless charging circuit 520 is connected.

[0105] In operation 760, the first wireless charging circuit 520 may determine whether a power request signal is received from the second electronic device 502. The power request signal may be a signal (eg, a "control error packet (CEP)") requesting an increase (or decrease) in power being transmitted.

[0106] In operation 765 , when the power request signal is not received from the second electronic device 502 , the first wireless charging circuit 520 may maintain the power supply state.

[0107] In operation 770, when a power request signal is received from the second electronic device 502, the first wireless charging circuit 520 may change the power condition so as to reflect a portion of the power change amount preset with respect to the power request signal. For example, the first wireless charging circuit 520 may change the power condition so as to reflect only 10% of the power change amount preset with respect to the power request signal.

[0108] According to various embodiments, when wireless charging is continuously performed, the first wireless charging circuit 520 may measure the charging current Iout according to a designated period of time and change the power condition according to operations 720 to 770 .

[0109] Figure 7b is a flow chart illustrating example operations in a power limiting mode according to various embodiments.

[0110] refer to Figure 7b In operation 771, the first power management circuit 510 (eg, Figure 1 The first electronic device 101 ) can wirelessly transmit power received from the battery 506 (or the external power source 503 ) to the second electronic device 502 through the first wireless charging circuit 520 and the first conductive coil 530 .

[0111] In operation 773 , the first wireless charging circuit 520 may measure the charging current Iout flowing from the first power management circuit 510 to the first wireless charging circuit 520 through the wireless power terminal 511 .

[0112] In operation 775 , the first wireless charging circuit 520 may determine whether the measured charging current Iout exceeds a maximum allowable current value Iout_Max set in the first power management circuit 510 .

[0113] In operation 777 , when the measured charging current Iout exceeds the maximum allowable current value Iout_Max, the first wireless charging circuit 520 may operate in a power limiting mode in which the first wireless charging circuit 520 maintains the charging current Iout.

[0114] In the power limit mode, the first wireless charging circuit 520 may ignore the power request signal of the second electronic device 502. According to an example, a request for increasing power due to a CEP packet of the second electronic device 502 may be ignored. The first wireless charging circuit 520 may maintain the charging current Iout for wireless charging so that the wireless charging operation is not terminated.

[0115] According to various embodiments, when the first electronic device 501 ignores the power request signal (CEP packet) of the second electronic device 502, the second electronic device 502 may continuously send the power request signal within the period allowed by the wireless charging related standards. In this case, the first electronic device 501 may send a command (or an additional packet) to the second electronic device 502 to extend the period for sending the power request signal. When the second electronic device 502 does not receive the response of the first electronic device 501 in response to the power request signal for more than a specified number of times, the second electronic device 502 may extend the period for sending the power request signal. The second electronic device 502 may linearly increase the period for sending the CEP packet (e.g., 10ms, 20ms, 30ms, and 40ms) or exponentially increase the period for sending the CEP packet (e.g., 10ms, 20ms, 40ms, and 80ms).

[0116] Figure 7c is a flow chart illustrating example operations in a step change mode and a power limit mode according to various embodiments.

[0117] refer to Figure 7c In operation 781, the first electronic device 501 (eg, Figure 1 The first power management circuit 510 of the first electronic device 101 may wirelessly transmit power received from the battery 506 (or the external power source 503 ) to the second electronic device 502 through the first wireless charging circuit 520 and the first conductive coil 530 .

[0118] In operation 783 , the first wireless charging circuit 520 may measure the charging current Iout flowing from the first power management circuit 510 to the first wireless charging circuit 520 through the wireless power terminal 511 .

[0119] In operation 785, the first wireless charging circuit 520 may determine whether the measured charging current Iout exceeds a first threshold. The first threshold may be a value lower than the maximum allowable current value Iout_Max set in the first power management circuit 510. For example, the first threshold may be the maximum allowable current value Iout_Max*90%.

[0120] In operation 787, when the charging current Iout exceeds the specified first threshold, the first wireless charging circuit 520 may operate in the step change mode to step the wireless charging state. In the step change mode, the first wireless charging circuit 520 may increase a portion of the power set in the power request signal in response to the power request signal of the second electronic device 502.

[0121] In operation 789 , when operating in the step change mode, the first wireless charging circuit 520 may measure the charging current Iout.

[0122] In operation 791 , the first wireless charging circuit 520 may determine whether the charging current lout exceeds a specified second threshold value greater than the first threshold value. The second threshold value may be a value equal to a maximum allowable current value lout_Max set in the first power management circuit 510 .

[0123] In operation 793 , when the charging current Iout exceeds the specified second threshold, the first wireless charging circuit 520 may operate in a power limiting mode to maintain the charging current Iout.

[0124] In the power limit mode, the first wireless charging circuit 520 may ignore the power request signal of the second electronic device 502. According to an example, a request for increasing power due to a CEP packet of the second electronic device 502 may be ignored. The first wireless charging circuit 520 may maintain the charging current Iout for wireless charging so that the wireless charging operation is not terminated.

[0125] Figure 8 is a graph illustrating an example mode change according to a measured charging current according to various embodiments.

[0126] refer to Figure 5 and Figure 8 , the first wireless charging circuit 520 may measure the charging current Iout flowing from the first power management circuit 510 to the first wireless charging circuit 520 through the wireless power terminal 511 .

[0127] The first wireless charging circuit 520 may change a mode related to wireless power transmission based on the measured charging current lout.

[0128] For example, when the charging current Iout is less than or equal to the first threshold 801, the first wireless charging circuit 520 may operate in the power adjustment mode 810. In the power adjustment mode 810, the first wireless charging circuit 520 may increase or decrease the power transmitted wirelessly in response to a power request signal requesting an increase or decrease in the power to be transmitted.

[0129] For example, when the charging current Iout is between the first threshold value 801 and the second threshold value 802, the first wireless charging circuit 520 may operate in the step change mode 820. In the step change mode, the first wireless charging circuit 520 may adjust the amount of power wirelessly transmitted in response to the power request signal of the second electronic device 502 by reflecting a portion of the power change amount set in the power request signal.

[0130] For example, when the charging current Iout exceeds the second threshold 802, the first wireless charging circuit 520 may operate in the power limiting mode 830. In the power limiting mode 830, the first wireless charging circuit 520 may ignore the power request signal of the second electronic device 502 and maintain the current power condition.

[0131] Fig. 9 is a flow chart illustrating an example wireless charging method of a type of second electronic device according to various embodiments.

[0132] refer to Fig. 9 In operation 910, when starting Figure 6 During the power transmission step 630, the first wireless charging circuit 520 of the first electronic device 501 may transmit power to the second electronic device 502 under the first power condition according to the basic setting. The first power condition may have a first charging voltage Vout1 applied to the wireless power terminal 511 and a first maximum allowable current value Iout_Max1 of the charging current Iout that may flow through the wireless power terminal 511. For example, the first charging voltage Vout1 may be 5V, and the first maximum allowable current value Iout_Max1 may be 1.5A.

[0133] In operation 920, the first wireless charging circuit 520 may determine whether the second electronic device 502 is a first type of device charged by the designated first charging voltage Vout1. For example, the first type of device may be a wearable device such as a smart watch, a smart band, or smart glasses.

[0134] In operation 925, when the second electronic device 502 is a first type device, the first wireless charging circuit 520 may maintain a state in which wireless power is transmitted based on the first power condition. In the case of a wearable device, the wearable device may be charged at a relatively low voltage.

[0135] In operation 930, when the second electronic device 502 is a second type of device other than the first type of device, the first wireless charging circuit 520 may change from the first power condition to the second power condition and transmit wireless power. For example, the second type of device may be a smartphone, a tablet computer, or a sound output device.

[0136] The second power condition may have a second charging voltage Vout2 applied to the wireless power terminal 511 and a second maximum allowable current value Iout_Max2 of the charging current Iout that may flow through the wireless power terminal 511. The second charging voltage Vout2 of the second power condition may be higher than the first charging voltage Vout1 of the first power condition. The second maximum allowable current value Iout_Max2 of the second power condition may be lower than the first maximum allowable current value Iout_Max1 of the first power condition.

[0137] For example, when the first charging voltage Vout1 may be 5 V and the first maximum allowable current value Iout_Max1 is 1.5 A, the second charging voltage Vout2 may be 7.5 V and the second maximum allowable current value Iout_Max2 may be 1.1 A. As a result, the amount of power provided by the first power management circuit 510 may be maintained below a specified value (e.g., approximately 8.25 W) under the first power condition and the second power condition.

[0138] According to various embodiments, when the external power source 503 is connected, the first wireless charging circuit 520 can transmit wireless power by changing the power condition. The first wireless charging circuit 520 can change the power condition according to the type of the second electronic device 102 or the type of the external power source 503 (see Fig.11 ).

[0139] Fig.10 is a flow chart illustrating an example method of identifying a second electronic device type during a device-to-device wireless charging process according to various embodiments.

[0140] refer to Fig.10 In operation 1010, Figure 6In the device detection step 610, the first wireless charging circuit 520 of the first electronic device 501 may send a first signal (e.g., a digital ping) and detect the second electronic device 502 to receive wireless power. When the first wireless charging circuit 520 receives a second signal (e.g., a signal strength packet (SSP)) corresponding to the first signal from the second electronic device 502, the first wireless charging circuit 520 may start the wireless power transmission process.

[0141] In operation 1020, Figure 6 In the device identification step 610, the first wireless charging circuit 520 may receive a third signal, which is a signal related to the identification of the second electronic device 502 (for example, a WPC version, a power receiver manufacturer code (PRMC), or a product code), and the fourth signal is a signal from the second electronic device 502 related to the power setting of the second electronic device 502 (for example, a power level, a maximum power).

[0142] According to an example, the first wireless charging circuit 520 may receive a power receiver manufacturer code (PRMC) (or a unique number of a wireless charging IC) as a third signal (hereinafter referred to as first identification information). The first wireless charging circuit 520 may determine a power condition (operating point) (e.g., charging voltage, maximum allowable current value, or frequency value) by identifying the first identification information (e.g., PRMC). According to an example, the power condition (operating point) may be a condition for setting a voltage input to the first wireless charging circuit 520, rather than a condition for setting a peak voltage of an AC power source passing through the first conductive coil 530.

[0143] The first wireless charging circuit 520 may identify the type of the second electronic device 502 by using the first identification information (eg, PRMC), and enter a state capable of stably transmitting power before substantially performing power transmission.

[0144] For example, the first wireless charging circuit 520 may be set to a power condition corresponding to the identified power receiver manufacturer code (PRMC) of the second power management circuit 560 of the second electronic device 502 .

[0145] In operation 1030, Figure 6 In the power transmission step 630, the first wireless charging circuit 520 can preferentially provide wireless power to the second electronic device 502 under the specified power condition.

[0146] In operation 1040, in the power transmission step 630, the first wireless charging circuit 520 can determine whether information for changing the specified power condition (hereinafter referred to as change information) is received, or separate identification information unique to the second electronic device 502 (hereinafter referred to as second identification information) is received.

[0147] According to an example, the change information may be a packet indicating the end of charging in a general wireless charging device (eg, a charging pad) that is not a device-to-device wireless power transfer function.

[0148] According to an example, the second identification information may be an ID unique to each second electronic device 502 (eg, a device unique number).

[0149] In operation 1045 , when the change information or the second identification information is not received, the first wireless charging circuit 520 may maintain the existing power condition.

[0150] In operation 1050 , when the change information or the second identification information is received, the first wireless charging circuit 520 may change the power condition based on the change information and / or the second identification information.

[0151] There may be multiple devices that have different characteristics in terms of mechanical characteristics (e.g., battery or coil) even if they have the same first identification information (e.g., PRMC). The first wireless charging circuit 520 may set a power supply condition customized for the second electronic device 502 based on the change information or the second identification information. As a result, degradation during wireless power transmission can be reduced and power transmission efficiency can be improved.

[0152] According to various embodiments, after the power condition is changed, the first power management circuit 510 may change the power condition or return to a previous state according to a separate power request signal from the second electronic device 502 .

[0153] According to various embodiments, when the first wireless charging circuit 520 receives a charging termination request signal from the second electronic device 502, the first wireless charging circuit 520 may terminate the wireless charging process.

[0154] Fig.11 is a flowchart illustrating an example change of a power supply condition according to connection of an external power supply according to various embodiments.

[0155] refer to Fig.11 , in operation 1110, when the external power source 503 is not connected, the first wireless charging circuit 520 may wirelessly transmit power to the second electronic device 502 under the first power condition.

[0156] The first power condition may have a first charging voltage Vout1 applied to the wireless power terminal 511 and a first maximum allowable current value Iout_Max1 of the charging current Iout that may flow through the wireless power terminal 511. For example, the first charging voltage Vout1 may be 5V, and the first maximum allowable current value Iout_Max1 may be 1.5A.

[0157] In operation 1120, the first power management circuit 510 may recognize the connection of the external power source 503. For example, the external power source 503 may be a travel adapter (TA).

[0158] In operation 1125 , when the external power source 503 is not connected, the first wireless charging circuit 520 may maintain the first power condition according to the basic setting.

[0159] In operation 1130, when the external power source 503 is connected, the first wireless charging circuit 520 may determine whether the second electronic device 502 is a designated type of device capable of changing power conditions. For example, the designated type of device may be a smartphone or a tablet.

[0160] When the second electronic device 502 is not a device of a specified type, the first wireless charging circuit 520 may maintain the first power condition according to the basic setting.

[0161] In operation 1140 , when the second electronic device 502 is a device of a specified type, the first wireless charging circuit 520 may transmit or provide wireless power based on the output voltage of the external power source 503 .

[0162] According to an example, the first wireless charging circuit 520 may determine whether the output voltage of the external power source 503 is less than or equal to the first charging voltage Vout1 of the first power condition. According to the specified basic setting, when the output voltage of the external power source 503 is equal to or lower than the first charging voltage Vout1, the first wireless charging circuit 520 may operate under the second power condition based on the output voltage of the external power source 503. The second charging voltage Vout2 of the second power condition may have a value (7.5V) higher than the output voltage (5V) of the external power source 503. In this case, the second maximum allowable current value Iout_Max2 of the second power condition may be lower than the first maximum allowable current value Iout_Max1 of the first power condition.

[0163] According to various embodiments, the first wireless charging circuit 520 may operate under the second power condition and the separate power condition according to a specified time period during operation as the second power condition. The charging voltage and the maximum allowable current value of the separate power condition may be lower than the charging voltage and the maximum allowable current value of the second power condition (e.g., 5V and 0.3A).

[0164] According to various embodiments, when the external power source 503 is disconnected, the first power management circuit 510 may operate under a first power condition.

[0165] According to an example, when the output voltage of the external power source 503 exceeds the first charging voltage Vout1 according to a specified basic setting, the first wireless charging circuit 520 may operate under the second power condition, and after a specified period of time, operate under the third power condition.

[0166] The value (7.5 V) of the second charging voltage Vout2 of the second power condition may be lower than the output voltage (9 V) of the external power supply 503 and higher than the first charging voltage (5 V). In this case, the second maximum allowable current value Iout_Max2 (e.g., 1.1 A) of the second power condition may be lower than the second maximum allowable current value Iout_Max2 (e.g., 1.5 A) of the first power condition.

[0167] The third charging voltage Vout3 of the third power condition may have the same value as the output voltage (9V) of the external power supply 503. In this case, the third maximum allowable current value Iout_Max3 (e.g., 1.0A) of the third power condition may be lower than the second maximum allowable current value Iout_Max2 (e.g., 1.1A) of the second power condition.

[0168] Fig.12 is a block diagram of an example electronic device 1201 in a network environment 1200 according to various embodiments.

[0169] refer to Fig.12, the electronic device 1201 in the network environment 1200 may communicate with the electronic device 1202 through the first network 1298 (e.g., a short-range wireless communication network), or may communicate with the electronic device 1204 or the server through the second network 1299 (e.g., a long-range wireless communication network). According to an embodiment, the electronic device 1201 may communicate with the electronic device 1204 through the server 1208. According to an embodiment, the electronic device 1201 may include a processor 1220, a memory 1230, an input device 1250, a sound output device 1255, a display device 1260, an audio module 1270, a sensor module 1276, an interface 1277, a haptic module 1279, a camera module 1280, a power management module 1288, a battery 1289, a communication module 1290, a subscriber identification module 1296, or an antenna module 1297. In any embodiment, at least one of the components (e.g., display device 1260 or camera module 1280) may be omitted from electronic device 1201, or one or more other components may be further included in electronic device 1201. In any embodiment, some components may be implemented with a single integrated circuit. For example, sensor module 1276 (e.g., fingerprint sensor, iris sensor, or illumination sensor) may be embedded in display device 1260 (e.g., display).

[0170] The processor 1220 may, for example, execute software (e.g., program 1240) to control at least one other component (e.g., hardware or software component) of the electronic device 1201 connected to the processor 1220, and may perform various data processing or operations. According to an embodiment, as at least part of the data processing or operation, the processor 1220 may load a command or data received from any other component (e.g., sensor module 1276 or communication module 1290) to the volatile memory 1232, the processor 1220 may process the command or data stored in the volatile memory 1232, and may store the processed data in the non-volatile memory 1234. According to an embodiment, the processor 1220 may include a main processor 1221 (e.g., a central processing unit or an application processor) and an auxiliary processor 1223 (e.g., a graphics processing device, an image signal processor, a sensor hub processor, or a communication processor), which may operate independently of the main processor 1221 or operate together with the main processor 1221. Additionally or alternatively, the auxiliary processor 1223 may be configured to use less power or be dedicated to a specific function than the main processor 1221. The auxiliary processor 1223 may be implemented separately from the main processor 1221, or may be implemented as part of the main processor 1221.

[0171] The auxiliary processor 1223 may control at least a portion of a function or state associated with at least one component of the electronic device 1201 (e.g., the display device 1260, the sensor module 1276, or the communication module 1290), for example, replacing the main processor 1221 when the main processor 1221 is in an inactive (e.g., sleep) state, and together with the main processor 1221 when the main processor 1221 is in an active (e.g., application execution) state. According to an embodiment, the auxiliary processor 1223 (e.g., an image signal processor or a communication processor) may be implemented as a part of any other component (e.g., the camera module 1280 or the communication module 1290) that is functionally (or operationally) associated with the auxiliary processor 1223.

[0172] The memory 1230 may store various data used by at least one component of the electronic device 1201 (e.g., the processor 1220 or the sensor module 1276). Such data may include, for example, software (e.g., program 1240), or input data or output data associated with a software command. The memory 1230 may include a volatile memory 1232 or a non-volatile memory 1234.

[0173] The program 1240 may be stored in the memory 1230 as software, and may include, for example, an operating system 1242 , middleware 1244 , or an application 1246 .

[0174] The input device 1250 may receive a command or data to be used by a component (eg, processor 1220) of the electronic device 1201 from outside the electronic device 1201 (eg, a user). The input device 1250 may include, for example, a microphone, a mouse, or a keyboard.

[0175] The sound output device 1255 can output a sound signal to the outside of the electronic device 1201. The sound output device 1255 may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as multimedia playback or recording playback, and the receiver may be used to receive an incoming call. Depending on the embodiment, the receiver may be implemented separately from the speaker, or may be implemented as part of the speaker.

[0176] The display device 1260 can intuitively provide information to the outside of the electronic device 1201 (e.g., a user). The display device 1260 may include, for example, a display, a hologram device, or a control circuit for controlling a projector and corresponding devices. According to an embodiment, the display device 1260 may include a touch circuit configured to sense a touch, or a sensor circuit (e.g., a pressure sensor) configured to measure the strength of a force generated by a touch.

[0177] The audio module 1270 can convert sound into an electrical signal, or vice versa, can convert an electrical signal into sound. According to an embodiment, the audio module 1270 can obtain sound through the input device 1250, or can output sound through the sound output device 1255, or output sound through an external electronic device (e.g., electronic device 1202) (e.g., a speaker or earphone) directly or wirelessly connected to the electronic device 1201.

[0178] The sensor module 1276 can sense an operating state (e.g., power or temperature) or an external environment state (e.g., a user state) of the electronic device 1201, and can generate an electrical signal or data value corresponding to the sensed state. According to an embodiment, the sensor module 1276 may include, for example, a gesture sensor, a grip sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biosensor, a temperature sensor, a humidity sensor, or an illumination sensor.

[0179] The interface 1277 may support one or more specified protocols that may be used to directly and wirelessly connect the electronic device 1201 to an external electronic device (e.g., the electronic device 1202). According to an embodiment, the interface 1277 may include, for example, a high-definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface.

[0180] The connection terminal 1278 may include a connector that allows the electronic device 1201 to be physically connected to an external electronic device (e.g., the electronic device 1202). According to an embodiment, the connection terminal 1278 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0181] The haptic module 1279 may convert the electrical signal into mechanical stimulation (eg, vibration or motion) or electrical stimulation that the user may sense through a sense of touch or motion. According to an embodiment, the haptic module 1279 may include, for example, a motor, a piezoelectric sensor, or an electrical stimulation device.

[0182] The camera module 1280 may capture still images and videos. According to an embodiment, the camera module 1280 may include one or more lenses, an image sensor, an image signal processor, or a flash (or electric flash).

[0183] The power management module 1288 may manage power supplied to the electronic device 1201. According to an embodiment, the power management module 1288 may be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

[0184] The battery 1289 may power at least one component of the electronic device 1201. According to an embodiment, the battery 1289 may include, for example, an uncharged primary battery, a rechargeable secondary battery, or a fuel cell.

[0185] The communication module 1290 can directly establish a direct (or wired) communication channel or a wireless communication channel between the electronic device 1201 and the external electronic device (e.g., the electronic device 1202, the electronic device 1204, or the server 1208) or can perform communication through the established communication channel. The communication module 1290 may include one or more communication processors that operate independently of the processor 1220 (e.g., the application processor) and support direct (or wired) communication or wireless communication. According to an embodiment, the communication module 1290 may include a wireless communication module 1292 (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 1294 (e.g., a local area network (LAN) communication module or a power line communication module). The corresponding communication module of such a communication module can communicate with the external electronic device through a first network 1298 (e.g., a short-range communication network such as Bluetooth, Wi-Fi Direct or Infrared Data Association (IrDA)) or a second network 1299 (e.g., a long-range communication network such as a cellular network, the Internet, or a computer network (e.g., a LAN or WAN)). The above-mentioned types of communication modules may be integrated into one component (e.g., a single chip), or may be implemented with multiple components (e.g., multiple chips) that are independent of each other. The wireless communication module 1292 may verify and authenticate the electronic device 1201 within a communication network such as the first network 1298 or the second network 1299 by using subscriber information (e.g., International Mobile Subscriber Identity (IMSI)) stored in the subscriber identification module 1296.

[0186] The antenna module 1297 may transmit a signal or power to the outside (e.g., an external electronic device), or may receive a signal or power from the outside. According to an embodiment, the antenna module 1297 may include one or more antennas, and the communication module 1290 may, for example, select at least one antenna suitable for a communication scheme used in a computer network such as the first network 1298 or the second network 1299 from the one or more antennas. A signal or power may be exchanged between the communication module 1290 and the external electronic device through the selected at least one antenna, or may be received from the external electronic device through the selected at least one antenna and the communication module 1290.

[0187] At least some of the components may be connected to each other via a communication scheme between peripheral devices (e.g., a bus, general purpose input and output (GPIO), a serial peripheral interface (SPI), or a mobile industry processor interface (MIPI)) and may exchange signals (e.g., commands or data) with each other.

[0188] According to an embodiment, a command or data may be sent or received (or exchanged) between the electronic device 1201 and the external electronic device 1204 through the server 1208 connected to the second network 1299. Each of the electronic devices 1202 and 1204 may be a device, the type of which is the same as or different from the type of the electronic device 1201. According to an embodiment, all or part of the operations to be performed in the electronic device 1201 may be performed in one or more external devices of the external electronic device 1202, 1204 or the server 1208. For example, in the case where the electronic device 1201 should automatically or in response to a request from a user or any other device to perform any function or service, the electronic device 1201 may request one or more external electronic devices to perform at least a part of the function or service, rather than performing a function or service or other internally. The one or more external electronic devices receiving the request may perform at least a part of the function or service requested in this way or an additional function or service associated with the request, and may provide the result of the execution to the electronic device 1201. The electronic device 1201 may process the received result as is or otherwise, and may provide the processed result as at least a part of the response to the request. To this end, for example, cloud computing, distributed computing or client-server computing techniques may be used.

[0189] The electronic device according to various embodiments disclosed in the present disclosure may be various types of devices. The electronic device may include, for example, a portable communication device (e.g., a smart phone), a computer device, a portable multimedia device, a mobile medical device, a camera, a wearable device, or a household device. The electronic device according to the embodiments of the present disclosure should not be limited to the above-mentioned devices.

[0190] It should be understood that the various embodiments of the present disclosure and the terms used in the embodiments are not intended to limit the technical features disclosed in the present disclosure to the specific embodiments disclosed herein; on the contrary, the present disclosure should be understood to cover various modifications, equivalents or substitutions of the embodiments of the present disclosure. With regard to the description of the drawings, similar or related components may be designated by similar reference numerals. As used herein, the singular form of a noun corresponding to an item may include one or more items, unless the context clearly indicates otherwise. In the disclosure disclosed herein, each of the expressions "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "one or more of A, B and C" or "one or more of A, B and C" etc. used herein may include any and all combinations of one or more associated list items. Expressions such as "first", "second", "the first" or "the second" may be used only for the purpose of distinguishing one component from other components, but do not limit the corresponding components in other aspects (such as importance or order). It should be understood that if an element (e.g., a first element) is referred to (with or without the terms "operably" or "communicatively") as being "coupled with," "coupled to," "connected with," or "connected to" another element (e.g., a second element), the element may be coupled to the other element directly (e.g., by wire), wirelessly, or via a third element.

[0191] The term "module" used in the present disclosure may include a unit implemented in hardware, software or firmware, and may be used interchangeably with the terms "logic", "logic block", "component" and "circuit". A "module" may be the smallest unit of an integrated component or a part thereof. A "module" may be the smallest unit for performing one or more functions or a part thereof. For example, according to an embodiment, a "module" may include an application specific integrated circuit (ASIC).

[0192] Various embodiments of the present disclosure may be implemented by software (e.g., program 1240) including instructions stored in a machine-readable storage medium (e.g., internal memory 1236 or external memory 1238) readable by a machine (e.g., electronic device 1201). For example, a processor (e.g., processor 1220) of a machine (e.g., electronic device 1201) may call instructions from a machine-readable storage medium and execute the instructions so called. The machine may perform at least one function based on at least one instruction called. One or more instructions may include code generated by a compiler or code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. A "non-transitory" storage medium is tangible but may not include signals (e.g., electromagnetic waves). The term "non-transitory" does not distinguish between a case where data is permanently stored in a storage medium and a case where data is temporarily stored in a storage medium.

[0193] According to various example embodiments, an electronic device may include a housing having a first surface, a second surface opposite to the first surface, and a side surface between the first surface and the second surface; a display having at least a portion visible through the first surface; a conductive coil arranged between the display and the second surface of the housing; a wireless charging circuit electrically connected to the conductive coil; a power management circuit connected to the wireless charging circuit; a battery connected to the power management circuit; and a processor operatively connected to the display and the power management circuit, and the processor may be configured to control the electronic device to: measure current flowing from the power management circuit to the wireless charging circuit when power is transmitted to an external device through the conductive coil, and adjust the power transmitted to the external device through the conductive coil based on a current value between a first threshold and a second threshold greater than the first threshold, based on a portion of a preset amount of power in a signal requesting an increase in power.

[0194] According to various example embodiments, the first threshold value and the second threshold value may be determined based on a maximum allowable value of the current set in the power management circuit, the maximum allowable value of the current being set in the power management circuit.

[0195] According to various example embodiments, the first threshold may be a maximum allowed value of the first ratio, and the second threshold may be equal to the maximum allowed value.

[0196] According to various example embodiments, the processor may be configured to control the electronic device to receive first identification information from the external device through the conductive coil before power is transmitted to the external device, and set a maximum allowable value based on the first identification information.

[0197] According to various example embodiments, the processor may be configured to control the electronic device to: after power begins to be transmitted to the external device, receive second identification information from the external device through the conductive coil, and set the maximum allowable value based on the second identification information. The second identification information may include unique device information of the external device. The second identification information may include unique device information of the external device.

[0198] According to various example embodiments, the processor may be configured to control the electronic device to detect connection of an external power source to the power management circuit, and change the maximum allowed value when the external power source is connected.

[0199] According to various example embodiments, the processor may be configured to control the electronic device to: maintain the maximum allowed value based on the external device being a first specified type of device. Based on the external device being a second specified type of device, the processor may be configured to gradually increase the voltage applied from the power management circuit to the wireless charging circuit, and based on the increase in the voltage, gradually reduce the maximum allowed value.

[0200] According to various example embodiments, the processor may be configured to control the electronic device to determine a maximum allowable value and a change amount of the voltage based on an output voltage of the external power source.

[0201] According to various example embodiments, the processor may be configured to control the electronic device to adjust the power transmitted to the external device through the conductive coil based on the overall power amount based on the signal being received in a state where the current value is less than the first threshold.

[0202] According to various example embodiments, the processor may be configured to control the electronic device to maintain power transmitted to the external device regardless of a signal requesting an increase in power based on the signal being received in a state where the current value exceeds the second threshold.

[0203] According to various example embodiments, the processor may be configured to control the electronic device to transmit a response signal requesting the external device to stop transmitting a signal or increase a transmission cycle based on the current value being between the first threshold and the second threshold.

[0204] According to various example embodiments, the processor may include a microcontroller unit (MCU) in the wireless charging circuit.

[0205] According to various example embodiments, a method for transmitting wireless power may include sending a first signal using a conductive coil in an electronic device; receiving a second signal corresponding to the first signal from an external device; receiving a third signal including first identification information for the external device and a fourth signal including settings for wireless power transmission from the external device; based on the third signal and the fourth signal, wirelessly transmitting power to the external device; when power is transmitted to the external device through the conductive coil, measuring current flowing from a power management circuit of the electronic device to a wireless charging circuit, and based on the current value being between a first threshold and a second threshold greater than the first threshold, adjusting the power transmitted to the external device through the conductive coil based on a portion of a preset amount of power in a signal requesting an increase in power.

[0206] According to various example embodiments, the method of transmitting wireless power may further include adjusting power transmitted to the external device through the conductive coil based on the overall power amount when a signal is received in a state where the current value is less than a first threshold.

[0207] According to various exemplary embodiments, the method of transmitting wireless power may further include maintaining power transmitted to the external device based on that a signal is received in a state where the current value exceeds a second threshold value regardless of a signal requesting an increase in power.

[0208] According to various example embodiments, the method of transmitting wireless power may further include detecting connection of an external power source, and changing the maximum allowed value based on the external power source being connected.

[0209] According to various example embodiments, the method of transmitting wireless power may further include gradually increasing a voltage applied from the power management circuit to the wireless charging circuit, and gradually decreasing a maximum allowable value based on the increase in the voltage.

[0210] According to an embodiment, the method according to various embodiments disclosed in the present disclosure may be provided as part of a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., a compact disc read-only memory (CD-ROM)), or may be downloaded through an application store (e.g., Play Store TM ) or online direct distribution (e.g., download or upload) between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or generated in a machine-readable storage medium, such as a memory of a manufacturer's server, an application store's server, or a relay server.

[0211] According to various embodiments, each component (e.g., module or program) of the above-mentioned components may include one or more entities. According to various embodiments, at least one or more components of the above-mentioned components or operations may be omitted, or one or more components or operations may be added. Alternatively or in addition, some components (e.g., modules or programs) may be integrated in one component. In such a case, the integrated component may perform the same or similar functions performed by each corresponding component before integration. According to various embodiments, the operations performed by modules, programming or other components may be performed sequentially, in parallel, repeatedly or in a heuristic manner, or at least some operations may be performed in different orders, omitted, or other operations may be added.

[0212] While the present disclosure has been illustrated and described with reference to various example embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the present disclosure, including the appended claims and their equivalents.

Claims

1. An electronic device, include: a display including at least a portion visible through a first surface of the electronic device; a conductive coil disposed between the display and a second surface opposite the first surface in the electronic device; a wireless charging circuit electrically connected to the conductive coil; a power management circuit connected to the wireless charging circuit; a battery connected to a power management circuit; as well as a processor operatively connected to the display and the power management circuitry, Wherein the processor is configured to control the electronic device to: When power is transferred to the external device through the conductive coil, the current flowing from the power management circuit to the wireless charging circuit is measured. receiving a power request signal from an external device, and In response to receiving a power request signal, when the measured current value is between a first threshold value and a second threshold value, transmitting a portion of the amount of power set in the received power request signal, wherein the power request signal is a signal requesting an increase in the power being transmitted to the external device, and The second threshold is equal to a maximum allowable current value of the current flowing from the power management circuit to the wireless charging circuit.

2. The electronic device according to claim 1, in, The processor is configured to control the electronic device to: receiving first identification information from the external device through the conductive coil before the power is transmitted to the external device, and Based on the first identification information, a maximum allowable current value is set.

3. The electronic device according to claim 2, in, The first identification information includes information about a power management circuit included in the external device.

4. The electronic device according to claim 1, in, The processor is configured to control the electronic device to: After power starts to be transmitted to the external device, receiving second identification information from the external device through the conductive coil, and Based on the second identification information, a maximum allowable current value is set.

5. The electronic device according to claim 4, in, The second identification information includes unique device information of the external device.

6. The electronic device according to claim 1, in, The processor is configured to control the electronic device to: Detects connection of external power to the power management circuit, and Based on which external power source is connected, the maximum allowable current value changes.

7. The electronic device according to claim 6, in, The processor is configured to control the electronic device to maintain a maximum allowed current value based on the external device being a device of the first specified type.

8. The electronic device according to claim 6, in, The processor is configured to control the electronic device to: Based on the external device being a device of the second specified type, gradually increasing the voltage applied from the power management circuit to the wireless charging circuit, and As the voltage increases, the maximum allowable current value is gradually reduced.

9. The electronic device according to claim 8, in, The processor is configured to control the electronic device to determine a maximum allowable current value and an amount of change in voltage based on an output voltage of the external power source.

10. The electronic device according to claim 1, in, The processor is configured to control the electronic device to: When the measured current value is less than the first threshold value and a power request signal is received, the entire amount of power set in the received power request signal is transmitted.

11. The electronic device according to claim 1, in, The processor is configured to control the electronic device to: When the measured current value exceeds the second threshold and a power request signal is received, the amount of power being transmitted is maintained regardless of the received power request signal.

12. The electronic device according to claim 1, in, The processor is configured to control the electronic device to: When the measured current value is between the first threshold value and the second threshold value, a response signal requesting the external device to stop transmitting the power request signal or to increase a transmission cycle of the power request signal is transmitted.

13. A method for transmitting wireless power performed in an electronic device, the method include: sending a first signal using a conductive coil in an electronic device; receiving a second signal corresponding to the first signal from an external device; receiving, from the external device, a third signal including first identification information for the external device and a fourth signal including settings for wireless power transmission; wirelessly transmitting power to an external device based on the third signal and the fourth signal; When power is transferred to the external device through the conductive coil, the current flowing from the power management circuit of the electronic device to the wireless charging circuit is measured, receiving a power request signal from an external device; as well as In response to receiving a power request signal, when the measured current value is between a first threshold value and a second threshold value, transmitting a portion of the amount of power set in the received power request signal, wherein the power request signal is a signal requesting an increase in the power being transmitted to the external device, and The second threshold is equal to a maximum allowable current value of the current flowing from the power management circuit to the wireless charging circuit.

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