Electronic device for wirelessly receiving power, and method for operating same

Abstract

An electronic device according to one embodiment may comprise: a power transmission / reception circuit including a first coil; a rectifying circuit configured to rectify power provided from the power transmission / reception circuit; a charging circuit; and a control circuit. The control circuit according to one embodiment may be configured to wirelessly receive first power from an external electronic device through the power transmission / reception circuit. The control circuit according to one embodiment may be configured to identify a first voltage and a first current applied to the rectifying circuit on the basis of the first power. The control circuit according to one embodiment may be configured to identify a coupling coefficient indicating an alignment state of the first coil and a second coil included in the external electronic device on the basis of identifying the first voltage and the first current. The control circuit according to one embodiment may be configured to reduce a voltage of power outputted from the rectifying circuit to the charging circuit or adjust an equivalent capacitance value of the power transmission / reception circuit on the basis of identifying that the coupling coefficient is lower than a specified value.

Description

Electronic device for receiving power wirelessly and method of operation thereof

[0001] Various embodiments of the present invention relate to an electronic device that wirelessly receives power and a method of operating the same.

[0002] As wireless charging technology advances, research is being conducted on methods for supplying power to multiple electronic devices from a single charging device. This wireless charging technology utilizes wireless power transmission and reception. For example, it allows electronic devices to automatically charge their batteries simply by placing them on a charging pad, without the need for a separate charging connector.

[0003] Wireless charging technologies include electromagnetic induction, resonance, and RF / microwave radiation, which converts electrical energy into microwaves and transmits it.

[0004] Wireless power transfer involves transferring power between a first coil at the transmitter and a second coil at the receiver. The transmitter generates a magnetic field, and changes in the magnetic field at the receiver induce or resonate current, generating energy.

[0005] Wireless power transmission technology using electromagnetic induction is a method of transmitting power using an electromagnetic field induced in a coil. A wireless power transmission device generates an electromagnetic field by applying a current to a transmission coil, and an induced electromotive force is formed in a receiving coil of a wireless power reception device by the generated electromagnetic field, thereby allowing power to be transmitted wirelessly.

[0006] An electronic device according to one embodiment may include a power transmission / reception circuit including a first coil, a rectifier circuit configured to rectify power provided from the power transmission / reception circuit, a charging circuit, and a control circuit. The control circuit according to one embodiment may be configured to wirelessly receive a first power from an external electronic device through the power transmission / reception circuit. The control circuit according to one embodiment may be configured to determine a first voltage and a first current applied to the rectifier circuit based on the first power. The control circuit according to one embodiment may be configured to determine a coupling coefficient indicating an alignment state of the first coil and a second coil included in the external electronic device based on determining the first voltage and the first current. The control circuit according to one embodiment may be configured to reduce a voltage of power output from the rectifier circuit to the charging circuit or adjust an equivalent capacitance value of the power transmission / reception circuit based on determining that the coupling coefficient is lower than a specified value.

[0007] According to one embodiment, a method of operating an electronic device may include an operation of wirelessly receiving a first power from an external electronic device through a power transmission / reception circuit included in the electronic device. According to one embodiment, a method of operating an electronic device may include an operation of checking a first voltage applied to a rectifier circuit included in the electronic device and a first current induced in a first coil included in the power transmission / reception circuit based on the first power. According to one embodiment, a method of operating an electronic device may include an operation of checking a coupling coefficient indicating an alignment state of the first coil and a second coil included in the external electronic device based on checking the first voltage and the first current. According to one embodiment, a method of operating an electronic device may include an operation of reducing a voltage of power output from the rectifier circuit to a charging circuit included in the electronic device or adjusting an equivalent capacitance value of the power transmission / reception circuit based on checking that the coupling coefficient is lower than a specified value.

[0008] In one embodiment, a non-transitory recording medium may store instructions that perform the following operations: receiving a first power wirelessly from an external electronic device through a power transmission / reception circuit included in an electronic device; checking, based on the first power, a first voltage applied to a rectifier circuit included in the electronic device and a first current induced in a first coil included in the power transmission / reception circuit; checking, based on the checking of the first voltage and the first current, a coupling coefficient indicating an alignment state of the first coil and a second coil included in the external electronic device; and reducing a voltage of power output from the rectifier circuit to a charging circuit included in the electronic device or adjusting an equivalent capacitance value of the power transmission / reception circuit.

[0009] FIG. 1 is a block diagram of an electronic device for wirelessly transmitting power and an electronic device for wirelessly receiving power according to various embodiments.

[0010] FIG. 2 is a block diagram of a wireless power transmission device and a wireless power reception device according to various embodiments.

[0011] FIG. 3 is a diagram for explaining the operation of a control circuit included in a wireless power receiving device according to one embodiment.

[0012] FIG. 4 is a flowchart for explaining the operation of a wireless power receiving device according to one embodiment.

[0013] FIG. 5 is a flowchart illustrating an operation of a wireless power receiving device according to one embodiment of the present invention to check a coupling coefficient.

[0014] Figures 6a and 6b are drawings showing equivalent circuits of a power system according to one embodiment.

[0015] FIG. 7 is a phasor diagram showing the thevenin voltage of an equivalent circuit of a power system according to one embodiment.

[0016] FIG. 8 is a diagram for explaining an operation of a wireless power receiving device according to one embodiment of the present invention to adjust the duty ratio and phase of a rectifier circuit.

[0017] FIG. 9 is a flowchart illustrating an operation of a wireless power receiving device according to one embodiment of the present invention to reduce the voltage of power output from a rectifier circuit or adjust the equivalent capacitance value of a power transmission / reception circuit based on checking a coupling coefficient.

[0018] FIG. 10 is a graph showing power efficiency when the voltage of power output from a rectifier circuit according to one embodiment is reduced or the equivalent capacitance value of a power transmission / reception circuit is reduced.

[0019] FIG. 11 is a graph showing a change in power efficiency according to a coupling coefficient when the voltage of power output from a rectifier circuit according to one embodiment is reduced or the equivalent capacitance value of a power transmission / reception circuit is reduced.

[0020] FIG. 12 is a block diagram of an electronic device within a network environment, according to one embodiment.

[0021] FIG. 1 is a block diagram of an electronic device that wirelessly transmits power (hereinafter, referred to as a wireless power transmitting device) and an electronic device that wirelessly receives power (hereinafter, referred to as a wireless power receiving device) according to various embodiments.

[0022] Referring to FIG. 1, a wireless power transmission device (101) according to various embodiments can wirelessly transmit power (106) to a wireless power reception device (103). Alternatively, the wireless power transmission device (101) can receive information (107) from the wireless power reception device (103). In one example, the wireless power transmission device (101) can transmit power (106) according to an inductive method. When the wireless power transmission device (101) uses an inductive method, the wireless power transmission device (101) can include, for example, at least one of a power source, a DC-DC conversion circuit (e.g., a DC / DC converter), a DC-AC conversion circuit (e.g., an inverter), an amplifier circuit, an impedance matching circuit, at least one capacitor, at least one coil, or a communication modulation circuit. The at least one capacitor may form a resonant circuit together with the at least one coil. In one embodiment, the wireless power transmission device (101) may be implemented in a manner defined in the Qi standard of the wireless power consortium (WPC). The wireless power transmission device (101) may include a coil that can generate an induced magnetic field when a current flows according to an induction method. The process of the wireless power transmission device (101) generating an induced magnetic field may be expressed as the wireless power transmission device (101) wirelessly transmitting power (106). In addition, in the coil of the wireless power reception device (103), an induced electromotive force (or current, voltage, and / or power) may be generated by a magnetic field generated in the surroundings according to a resonance method or an induction method. The process of generating an induced electromotive force through the coil may be expressed as the wireless power reception device (103) wirelessly receiving power (106).

[0023] A wireless power transmission device (101) according to various embodiments may communicate with a wireless power reception device (103). For example, the wireless power transmission device (101) may communicate with the wireless power reception device (103) according to an in-band method. The wireless power transmission device (101) may modulate data to be transmitted, for example, according to a frequency shift keying (FSK) modulation method, and the wireless power reception device (103) may provide information (107) by modulating according to an amplitude shift keying (ASK) modulation method. The wireless power transmission device (101) may confirm information (107) provided by the wireless power reception device (103) based on the amplitude of current and / or voltage applied to a transmission coil. In Fig. 1, the wireless power receiving device (103) is illustrated as directly transmitting information (107) to the wireless power transmitting device (101), but this is only for easy understanding, and those skilled in the art will understand that the wireless power receiving device (103) only controls the on / off of at least one switch inside. The operation of performing modulation based on the ASK modulation method and / or the FSK modulation method can be understood as an operation of transmitting data (or packet) according to the in-band communication method, and the operation of performing demodulation based on the ASK demodulation method and / or the FSK demodulation method can be understood as an operation of receiving data (or packet) according to the in-band communication method.

[0024] In this document, when a wireless power transmitter (101) or a wireless power receiver (103) performs a specific operation, it may mean that various hardware included in the wireless power transmitter (101) or the wireless power receiver (103), for example, a controller (for example, a micro controlling unit (MCU), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a microprocessor, or an application processor (AP)) performs a specific operation. Alternatively, when the wireless power transmitter (101) or the wireless power receiver (103) performs a specific operation, it may mean that a controller included in the wireless power transmitter (101) or the wireless power receiver (103) controls other hardware to perform a specific operation. Alternatively, the wireless power transmitter (101) or wireless power receiver (103) performing a specific operation may mean that at least one instruction for performing a specific operation stored in a storage circuit (e.g., memory) of the wireless power transmitter (101) or wireless power receiver (103) is executed, thereby causing a controller or other hardware to perform a specific operation.

[0025] FIG. 2 is a block diagram of a wireless power transmission device and a wireless power reception device according to one embodiment.

[0026] Referring to FIG. 2, according to one embodiment, a wireless power transmission device (101) may include a TX circuit (210), a coil (211), and a capacitor (212).

[0027] According to one embodiment, the TX circuit (210) may provide power provided by a power source to the coil (211). According to one embodiment, the TX circuit (210) may include a power source (not shown), a DC / DC converter (not shown), and / or an inverter (not shown). For example, the power source may include at least one of an interface for connecting to an external travel adapter (TA), a battery (not shown), a charger (not shown), or a power management integrated circuit (PMIC) (not shown) of the wireless power transmitter (101). According to one embodiment, the power provided by the power source may be provided by a DC / DC converter. The power source may provide, for example, direct current power to the DC / DC converter, but there is no limitation on the form of the power provided. The DC / DC converter may convert the voltage of the provided power and provide it to the inverter. A DC / DC converter can change the voltage of input DC power and provide DC power having the changed voltage (or driving voltage (VDD)) to an inverter. Those skilled in the art will understand that the DC / DC converter can perform, for example, buck conversion and / or boost conversion, but there is no limitation on the type thereof. The inverter can output AC power using the driving voltage provided from the DC / DC converter. For example, the inverter can include a plurality of switches that can form a full bridge circuit, and there is no limitation on the number of switches or the type of bridge circuit.

[0028] According to one embodiment, an AC power generated by a TX circuit (210) may be applied to a coil (211). The capacitor (212) may be a capacitor (e.g., a series compensation capacitor) connected in series with the coil (211). The coil (211) may form a magnetic field based on the applied AC power. A portion of the magnetic field (or magnetic flux) formed by the coil (211) may be applied to a second coil (221) of the wireless power receiving device (103). As the magnetic field applied to the first coil (221) of the wireless power receiving device (103) changes over time, an induced electromotive force (e.g., current, voltage, or power) may be generated in the first coil (221) of the wireless power receiving device (103).

[0029] According to one embodiment, the TX circuit (210) can check information provided by the wireless power receiving device (103) through the coil (211). The TX circuit (210) can, for example, perform analog-to-digital converting (ADC) on a signal received through the coil (211). The TX circuit (210) can decode a digital value obtained as a result of the ADC, and can check information provided by the wireless power receiving device (103) according to the decoding result. In one embodiment, the TX circuit (210) can check signal information modulated by the Amplitude Shift Keying (ASK) method. Those skilled in the art will understand that the decoding method may be based on, for example, the Qi standard, but is not limited thereto.

[0030] According to one embodiment, the wireless power receiving device (103) may include at least one of a power receiving circuit (220), a rectifier circuit (255), a control circuit (250), a capacitor (241), a charging circuit (244), or a battery (246).

[0031] According to one embodiment, the power receiving circuit (220) may include a first coil (221), a first capacitor (222), a second capacitor (223), or a third capacitor (224). According to one embodiment, the first coil (221), the first capacitor (222), the second capacitor (223), and the third capacitor (224) may form an LC resonant circuit corresponding to a frequency specified by the wireless power transmitting device (101). Depending on the implementation, the power receiving circuit (220) may not include the third capacitor (224) and / or the second switch (S2). Although the power receiving circuit (220) is illustrated in FIG. 2 as further including the third capacitor (224) and the second switch (S2), this is for convenience of explanation and the technical idea of ​​the present invention may not be limited thereto. However, for convenience of explanation, the power receiving circuit (220) will be described below as including a first coil (221), a first capacitor (222), a second capacitor (223), a third capacitor (224), a first switch (S1), and a second switch (S2). However, it may be included in the technical scope of the present invention as understood by those skilled in the art that the configuration of the power receiving circuit (220) may be changed to include at least some of the above configurations.

[0032] According to one embodiment, the wireless power receiving device (103) may wirelessly transmit power to another electronic device using the power receiving circuit (220). In this case, the power receiving circuit (220) may function as a power transmitting circuit. For example, the first coil (221), the first capacitor (222), the second capacitor (223), and the third capacitor (224) may form an LC resonant circuit corresponding to a specified frequency of the other electronic device. In other words, the power receiving circuit (220) may be implemented as a power transmitting and receiving circuit. However, in this specification, the content in which the power receiving circuit (220) receives power will be mainly described.

[0033] According to one embodiment, the first capacitor (222), the second capacitor (223), and the third capacitor (224) may be connected in parallel with each other. One end of each of the first capacitor (222), the second capacitor (223), and the third capacitor (224) may be connected to the first coil (221), and the other end of each of the first capacitor (222), the second capacitor (223), and the third capacitor (224) may be connected to one end of the rectifier circuit (255). The first switch (S1) may be connected in series with the second capacitor (223). The second switch (S2) may be connected in parallel with the third capacitor (224).

[0034] According to one embodiment, a rectifier circuit (or rectifier) ​​(255) may rectify power received from a wireless power transmitter (101) through a plurality of elements (e.g., transistors or field effect transistors (FETs)) (Q1, Q2, Q3, and Q4) controlled by a control circuit (250). The rectifier circuit (255) may rectify (or convert) AC power received from the wireless charging device into DC power, and output or provide the rectified DC power to the charging circuit (244). Depending on the implementation, the rectifier circuit (255) may include a regulator (e.g., a low dropout (LDO)) and may provide the rectified DC power to the charging circuit (244) through the regulator (e.g., a low dropout (LDO)).

[0035] According to one embodiment, the rectifier circuit (255) may include a plurality of transistors (Q1, Q2, Q3, Q4) that may operate as a full bridge circuit or a voltage doubler circuit. For example, each of the plurality of transistors (Q1, Q2, Q3, Q4) may be implemented as a metal oxide semiconductor field effect transistor (MOSFET).

[0036] According to one embodiment, one end of the power receiving circuit (220) may be connected to a connection point between transistors (Q1, Q2), and the other end of the power receiving circuit (220) may be connected to a connection point between transistors (Q3, Q4). For example, one end of the first transistor (Q1) and one end of the fourth transistor (Q4) may be connected to the charging circuit (244), one end of the second transistor (Q2) may be connected to the other end of the first transistor (Q1), and one end of the third transistor (Q3) may be connected to the other end of the fourth transistor (Q4). The other end of the second transistor (Q2) and the other end of the third transistor (Q3) may be connected to ground. The other end of the first transistor (Q1) and one end of the second transistor (Q2) may be connected to one end of the first coil (221), and one end of the third transistor (Q3) and the other end of the fourth transistor (Q4) may be connected to the other end of the first coil (221). The rectifier circuit (255) may convert AC power received through the first coil (221) into DC power. The control circuit (250) may control the on / off states of the plurality of transistors (Q1, Q2, Q3, Q4) so ​​that the AC power may be converted into DC power. The control circuit (250) may control the rectifier circuit (255) to rectify a power signal (e.g., an AC signal or AC power) received from the first coil (221) and supply the rectified power signal (e.g., a DC signal or DC power) to the charging circuit (244).

[0037] According to one embodiment, the control circuit (250) can check the voltage (VOUT) (e.g., output voltage) of the power output from the rectifier circuit (255). For example, the output voltage (VOUT) may be a voltage applied to the capacitor (241). For example, the wireless power receiving device (103) may further include a sensing circuit (not shown) for sensing the output voltage (VOUT). For example, the control circuit (250) can check the output voltage (VOUT) by checking the voltage value applied to the resistor included in the sensing circuit.

[0038] According to one embodiment, the control circuit (250) can determine a first voltage (VL) and a first current (IL) applied to the rectifier circuit (255) based on the first power wirelessly received from the wireless power transmitter (101). The wireless power receiver (103) may further include a sensing circuit (not shown) for sensing the first voltage (VL) and the first current (IL). For example, the control circuit (250) can determine the first current (IL) by determining a current value conducted through a resistor included in the sensing circuit. In addition, the control circuit (250) can determine the first voltage (VL) by determining a voltage difference between input terminals of power connected to the rectifier circuit (255).

[0039] According to one embodiment, the control circuit (250) may check a coupling factor (or coupling codificant) according to the alignment state of the first coil (221) included in the power receiving circuit (220) and the coil (211) included in the wireless power transmitting device (101) based on checking the first voltage and the first current. For example, the coupling factor may represent a magnetic flux ratio between the coils (211, 221). For example, the coupling factor may change according to at least one of the alignment state of the coils (211, 221), the presence of foreign substances between the coils (211, 221), and the size of the coils (211, 221). In this specification, it will be described on the premise that the coupling factor changes according to the alignment state of the coils (211, 221) among the above-described change causes. For example, in this specification, the coupling factor may represent the alignment state of the coils (211, 221).

[0040] According to one embodiment, the control circuit (250) may adjust (e.g., decrease) the equivalent capacitance value of the power receiving circuit (220) if the verified coupling coefficient is determined to be lower than a specified value. The control circuit (250) may reduce the voltage of the power output from the rectifier circuit (255) if the verified coupling coefficient is determined to be lower than a specified value. The control circuit (250) may also adjust (e.g., decrease) the equivalent capacitance value of the power receiving circuit (220) and reduce the voltage of the power output from the rectifier circuit (255) if the verified coupling coefficient is determined to be lower than a specified value.

[0041] According to one embodiment, the control circuit (250) may perform the above-described operation in a state where the first coil (221) included in the power receiving circuit (220) and the coil (211) included in the wireless power transmitting device (101) are not properly aligned. Through this, the control circuit (250) may increase the power transmission efficiency of a power transmission system (e.g., a system including a wireless power transmitting device (101) and a wireless power receiving device (103).

[0042] According to one embodiment, the control circuit (250) may check the equivalent impedance values ​​of the load section of the wireless power receiving device (103) by adjusting at least one of the duty ratio or phase of the rectifier circuit (255) multiple times to check the coupling coefficient. For example, the load section may include a portion of the wireless power receiving device (103) excluding the power receiving circuit (220). In addition, the control circuit (250) may check the voltage values ​​(e.g., voltage values ​​of the first voltage (VL)) applied to the rectifier circuit (255) when obtaining the equivalent impedance values ​​of the load section.

[0043] According to one embodiment, the plurality of transistors (Q1, Q2, Q3, Q4) may be implemented as a switch circuit. For example, each of the plurality of transistors (Q1, Q2, Q3, Q4) may be turned on / off under the control of the control circuit (255), and may be implemented as a switch circuit (e.g., a full bridge circuit or a voltage doubler) that may perform a specific function accordingly. Meanwhile, the number and types of transistors illustrated in FIG. 2 are merely exemplary, and embodiments of the present invention may not be limited thereto.

[0044] According to one embodiment, the control circuit (250) can control the on / off states (or on / off times) of the plurality of transistors (Q1, Q2, Q3, Q4). For example, the control circuit (250) can provide control signals (Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV) for controlling the on / off states (or on / off times) of the plurality of transistors (Q1, Q2, Q3, Q4) to the plurality of transistors (Q1, Q2, Q3, Q4). For example, the control circuit (250) can control the on / off times (e.g., duty ratios) of the plurality of transistors (Q1, Q2, Q3, Q4) to check or obtain equivalent impedance values ​​of loads having different values. The control circuit (250) can check the voltage values ​​applied to the rectifier circuit (255) when the corresponding equivalent impedance values ​​are obtained. The control circuit (250) can estimate or check the coupling coefficient using the checked voltage values ​​and equivalent impedance values.

[0045] According to one embodiment, the control circuit (250) may compare the identified coupling coefficient with a designated value. For example, the designated value may represent a value that serves as a reference for the control circuit (250) to perform an operation of reducing the magnitude of the output voltage of the rectifier circuit (255) or reducing the equivalent capacitance value of the power receiving circuit (220). For example, the designated value may vary depending on the type of the wireless power transmitting device (101). For example, since the size or position of the coil (211) may vary depending on the type of the wireless power transmitting device (101), the designated value may also vary depending on the type of the wireless power transmitting device (101). In addition, the designated value may vary depending on the type of the wireless power receiving device (103). For example, the designated value may be designated by a user or by the control circuit (250). According to one embodiment, the control circuit (250) can check the type of the wireless power transmission device (101) and determine a specified value based on the checked type of the wireless power transmission device (101).

[0046] According to one embodiment, the control circuit (250) may reduce the magnitude of the output voltage of the rectifier circuit (255) or reduce the equivalent capacitance value of the power receiving circuit (220) if the verified coupling coefficient is determined to be less than a specified value. Depending on the implementation, the control circuit (250) may also reduce the magnitude of the output voltage of the rectifier circuit (255) or reduce the equivalent capacitance value of the power receiving circuit (220) if the verified coupling coefficient is determined to be less than a specified value a specified number of times. For example, the specified number of times (e.g., three times) may be the number of times for re-verification to accurately determine whether the arrangements of the first coil (221) and the coil (211) are mismatched. For example, the specified number of times may be specified as single or multiple, and may be specified by a user or automatically specified by the control circuit (250).

[0047] According to one embodiment, the control circuit (250) can turn on / off a plurality of switches (S1, S2) included in the power receiving circuit (220) so that an equivalent capacitance value of the power receiving circuit (220) is adjusted. For example, the control circuit (250) can provide control signals (S1_CS, S2_CS) to the plurality of switches (S1, S2) to adjust the connection state of the first coil (221) and the plurality of capacitors (222, 223, 224) included in the power receiving circuit (220). Through this, the control circuit (250) can reduce the equivalent capacitance value of the power receiving circuit (220).

[0048] By using the above-described method, the wireless power receiving device (103) can increase the power transmission efficiency of the power system by reducing the equivalent capacitance value of the power receiving circuit (220) in a state where the coils included in the wireless power transmitting device (101) and the wireless power receiving device (103) are not completely aligned.

[0049] According to one embodiment, the control circuit (250) may control the rectifier circuit (255) to reduce the magnitude of the output voltage of the rectifier circuit (255). For example, the control circuit (250) may reduce the magnitude of the target voltage output from the rectifier circuit (255). In addition, the control circuit (250) may transmit information indicating that the magnitude of the target voltage has been reduced to the wireless power transmission device (101). In response to receiving the information, the wireless power transmission device (101) may transmit power corresponding to the reduced voltage to the wireless power reception device (103).

[0050] By using the above-described method, the wireless power receiving device (103) can increase the power transmission efficiency of the power system by reducing the target output voltage of the rectifier circuit (255) in a state where the coils included in the wireless power transmitting device (101) and the wireless power receiving device (103) are not completely aligned.

[0051] According to one embodiment, a capacitor (241) and a charging circuit (244) may be connected to the rectifier circuit (255). One end of the capacitor (241) may be grounded. A charge corresponding to a current output through the rectifier circuit (255) may be stored in the capacitor (241).

[0052] According to one embodiment, a regulator (not shown) may be disposed between the rectifier circuit (255) and the charging circuit (244). For example, the regulator may perform voltage conversion (e.g., buck conversion and / or boost conversion) and / or regulation of the rectified power output from the rectifier circuit (255).

[0053] According to one embodiment, the charging circuit (or charger) (244) can charge the battery (246) using power output from the rectifier circuit (255) (or regulator). According to various embodiments, the charging circuit (244) can control the voltage and / or current for charging the battery depending on the charging mode of the battery (e.g., constant current (CC) mode, constant voltage (CV) mode, or rapid charge mode).

[0054] Meanwhile, the number, type, and arrangement of the switches (S1, S2) illustrated in FIG. 2 are merely exemplary, and embodiments of the present invention may not be limited thereto. In addition, the number, type, and arrangement of the capacitors (222, 223, 224) and the first coil (221) illustrated in FIG. 2 are merely exemplary, and embodiments of the present invention may not be limited thereto.

[0055] FIG. 3 is a diagram for explaining the operation of a control circuit included in a wireless power receiving device according to one embodiment.

[0056] Referring to FIG. 3, according to one embodiment, the control circuit (250) may include at least one of a differential amplifier (310), a controller (320), a gate driver (330), or a switch controller (340).

[0057] According to one embodiment, the controller (320) can check the first voltage (VL) applied to the rectifier circuit (255) through the differential amplifier (310). For example, the differential amplifier (310) can output the first voltage (VL) to the controller (320) based on the voltage difference across the input terminals of the rectifier circuit (255). In addition, the controller (320) can check the first current (IL) applied to the rectifier circuit (255) (or induced in the first coil (221).

[0058] According to one embodiment, the controller (320) can determine or estimate the coupling coefficient based on determining the first voltage (VL) and the first current (IL). To determine the coupling coefficient, the controller (320) can determine a plurality of equivalent impedance values ​​for the load. To determine the plurality of equivalent impedance values, the controller (320) can adjust the duty cycle and / or phase of the rectifier circuit (255).

[0059] According to one embodiment, the controller (320) can control the on / off of the plurality of transistors (Q1, Q2, Q3, Q4) by controlling the gate driver (330). For example, the controller (320) can control the gate driver (330) to provide control signals (Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV) for adjusting the duty ratio and / or phase of the rectifier circuit (255) to the plurality of transistors (Q1, Q2, Q3, Q4). For example, the gate driver (330) can provide control signals (Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV) to the plurality of transistors (Q1, Q2, Q3, Q4) under the control of the controller (320). Depending on the implementation, the controller (320) may control the on / off of a plurality of transistors (Q1, Q2, Q3, Q4) without a gate driver (330). Here, not only outputting a control signal, but also refraining from outputting a control signal (e.g., stopping output or suppressing output) may be referred to as control of the controller (320).

[0060] According to one embodiment, the controller (320) can confirm or estimate the coupling coefficient by using a plurality of equivalent impedance values ​​for the load section of the wireless power receiving device (103) and voltage values ​​of the first voltage (VL) when the equivalent impedance values ​​are confirmed.

[0061] According to one embodiment, the controller (320) may reduce the equivalent capacitance value of the power receiving circuit (220) if it is determined that the coupling coefficient is lower than a specified value. For example, the controller (320) may control on / off of a plurality of switches (S1, S2, S3) included in the power receiving circuit (220) through a switch controller (340). The switch controller (340) may provide control signals (S1_CS, S2_CS) that command on / off of the plurality of switches (S1, S2). Depending on the implementation, the controller (320) may control on / off of the plurality of switches (S1, S2) without the switch controller (340). Here, not only outputting a control signal, but also refraining from outputting a control signal may be referred to as control of the controller (320).

[0062] According to one embodiment, the controller (320) may reduce the output voltage of the rectifier circuit (255) if the coupling coefficient is determined to be lower than a specified value. For example, the controller (320) may provide the rectifier circuit (255) with a control signal (VOUT_CS) that commands a reduction in the target voltage output by the rectifier circuit (255).

[0063] By using the above-described method, the wireless power receiving device (103) can increase the power transmission efficiency of the power system in a state where the coils included in the wireless power transmitting device (101) and the wireless power receiving device (103) are not completely aligned.

[0064] Meanwhile, although the control circuit (250) in FIG. 3 is illustrated as including a gate driver (330) and a switch controller (340) as separate configurations, the gate driver (330) and / or the switch controller (340) may be included in the controller (320).

[0065] FIG. 4 is a flowchart for explaining the operation of a wireless power receiving device according to one embodiment.

[0066] Referring to FIG. 4, in operation 401 according to one embodiment, an electronic device (e.g., a wireless power receiving device (103) of FIG. 1) may wirelessly receive first power from an external electronic device (e.g., a wireless power transmitting device (101) of FIG. 1) through a power transmitting / receiving circuit (e.g., a power receiving circuit (220) of FIG. 2).

[0067] In one embodiment, in operation 403, the electronic device (103) can determine a first voltage and a first current applied to a rectifier circuit (e.g., a rectifier circuit (255) of FIG. 2) based on a first power.

[0068] In one embodiment, in operation 405, the electronic device (103) may determine a coupling coefficient indicating an alignment state of a first coil (e.g., a first coil (221) of FIG. 2) included in a power transmission / reception circuit (220) and a second coil (e.g., a coil (211) of FIG. 2) included in an external electronic device (101) based on determining a first voltage and a first current.

[0069] In one embodiment, at operation 407, the electronic device (103) may reduce the voltage of the power output from the rectifier circuit (255) or adjust (e.g., reduce) the equivalent capacitance value of the power transmission / reception circuit (220) based on determining that the coupling coefficient is lower than a specified value.

[0070] By using the above-described method, the wireless power receiving device (103) can increase the power transmission efficiency of the power system in a state where the coils included in the wireless power transmitting device (101) and the wireless power receiving device (103) are not completely aligned.

[0071] FIG. 5 is a flowchart illustrating an operation of a wireless power receiving device according to one embodiment of the present invention to check a coupling coefficient.

[0072] Referring to FIG. 5, according to one embodiment, a self-device (e.g., a wireless power receiving device (103) of FIG. 1) can check a coupling coefficient indicating an alignment state of a first coil (e.g., a first coil (221) of FIG. 2) included in a power transmission / reception circuit (e.g., a power receiving circuit (220) of FIG. 2)) and a second coil (e.g., a coil (211) of FIG. 2) included in an external electronic device (e.g., a wireless power transmitting device (101) of FIG. 1).

[0073] According to one embodiment, in operation 501, the electronic device (103) may adjust at least one of the duty ratio or phase of a rectifier circuit (e.g., the rectifier circuit (255) of FIG. 2) multiple times to determine equivalent impedance values ​​of a load portion of the electronic device. For example, the electronic device (103) may adjust at least one of the duty ratio or phase of the rectifier circuit (255) and determine equivalent impedance values ​​of a load portion of the electronic device (103). For example, the load portion may refer to a portion of the electronic device (103) excluding the power receiving circuit (220).

[0074] According to one embodiment, in operation 503, the electronic device (103) can check the voltage values ​​applied to the rectifier circuit (255) when obtaining equivalent impedance values ​​of the load section of the electronic device (101).

[0075] According to one embodiment, in operation 505, the electronic device (103) can determine (or estimate) a coupling coefficient based on the determined voltage values ​​and equivalent impedance values.

[0076] Using the above-described method, the wireless power receiving device (103) can efficiently check the coupling coefficient that can estimate the state in which the coils included in the wireless power transmitting device (101) and the wireless power receiving device (103) are aligned.

[0077] Meanwhile, the method by which an electronic device or wireless power receiving device (103) checks the coupling coefficient will be specifically described in FIGS. 6a to 8 described below.

[0078] Figures 6a and 6b are drawings showing equivalent circuits of a power system according to one embodiment.

[0079] FIG. 6A may represent an equivalent circuit for a wireless power transmission device (101) and a wireless power reception device (103) according to an embodiment. FIG. 6B may represent a Thevenin equivalent circuit for a wireless power transmission device (101) and a wireless power reception device (103) as viewed from a load section (630) of the wireless power reception device (103) according to an embodiment.

[0080] Referring to FIG. 6A, according to one embodiment, an equivalent circuit of a wireless power transmitter (101) may include a power source (V1), an equivalent capacitor (C1), an equivalent resistor (R1), and a coil (L1) (e.g., the coil (211) of FIG. 2). An equivalent circuit of a wireless power receiver (103) may include an equivalent capacitor (C2), an equivalent resistor (R2), a coil (L2) (e.g., the first coil (221) of FIG. 2), and an equivalent impedance (Zac) of a load (630). A first voltage (VL) may be applied to the equivalent impedance (Zac) of the load.

[0081] According to one embodiment, a mutual inductance (M) may be generated between a coil (L1) of a wireless power transmitter (101) and a coil (L2) of a wireless power receiver (103). For example, the mutual inductance value may be proportional to a coupling coefficient (k) between the two coils, as in Equation 1.

[0082]

[0083] Referring to FIG. 6B, a Thevenin equivalent circuit for the wireless power transmitter (101) and the wireless power receiver (103) as viewed from the load section (630) of the wireless power receiver (103) may include a Thevenin voltage (Vth), a Thevenin impedance (Zth), and an equivalent impedance (Zac) of the load section (630). For example, the Thevenin voltage (Vth) may be determined as in Equation 2. For example, in the Thevenin equivalent circuit, when Zac is open (Zac = ∞), the voltage applied to VL may be represented by Voc. At this time, the Thevenin voltage (Vth) may be represented by Voc since Zac is in an open state. That is, Voc may represent the Thevenin voltage when Zac is open. Here, Z1 may be R1 + jwL1 + 1 / (jwC1). In one embodiment, considering Equation 2, the Tabnin impedance (Zth) viewed from the wireless power transmission device (101) at the Tabnin impedance (Zth) can be determined as in Equation 3. Here, Z2 can be R2+jwL2+1 / (jwC2).

[0084]

[0085]

[0086] According to one embodiment, referring to Equations 1 and 2, the coupling coefficient (k) value can be confirmed, estimated, or calculated by checking the Thevenin voltage (Vth). Meanwhile, a method by which an electronic device or a wireless power receiving device (103) checks the Thevenin voltage (Vth) will be specifically described in FIGS. 7 and 8 described below.

[0087] FIG. 7 is a phasor diagram showing the thevenin voltage of an equivalent circuit of a power system according to one embodiment.

[0088] According to one embodiment, in a phasor diagram, Vth may be represented as Vth∠Ψ, Zth as Zth∠δ, VL as VL∠0, and Zac as Zac∠Φ. For example, Ψ, δ, and Φ may represent the phase angles of Vth, Zth, and Zac, respectively, with respect to the phase angle of VL.

[0089] According to one embodiment, referring to FIG. 6b, it can be organized as in mathematical equation 4.

[0090]

[0091] According to one embodiment, if mathematical expression 4 is represented as a phasor diagram, it can be represented as in FIG. 7. For example, the magnitude of Vth can be organized as in mathematical expression 5 by the second law of cosines.

[0092]

[0093] According to one embodiment, the variables to be verified in Equation 5 may be Vth, Zth, and δ. Accordingly, the electronic device (or wireless power receiving device) (103) may obtain three equations as shown in Equations 6, 7, and 8 below by changing Zac∠Φ at least three times and checking the VL value at the time of change. Here, Zac1, Zac2, and Zac3 may represent equivalent impedances of the load unit (630) obtained by changing Zac∠Φ three times. VL1, VL2, and VL3 may represent voltage values ​​applied to the load unit (630) (or applied to the rectifier circuit (255)) when the corresponding equivalent impedances are obtained.

[0094] According to one embodiment, the electronic device (or wireless power receiving device) (103) can obtain three equations as shown in Equations 6, 7, and 8 below by changing at least one of the duty ratio or phase of the rectifier circuit (255) at least three times. The method by which the electronic device (or wireless power receiving device) (103) changes the duty ratio and phase of the rectifier circuit (255) will be specifically described in FIG. 8 below.

[0095]

[0096]

[0097]

[0098] According to one embodiment, the electronic device (or wireless power receiving device) (103) can determine the Vth value using three equations, such as Equations 6, 7, and 8. For example, the electronic device (or wireless power receiving device) (103) can determine the Vth value by calculating a simultaneous equation of the three equations.

[0099] In one embodiment, the electronic device (or wireless power receiver) (103) adjusts the phase of the rectifier circuit so that there is no phase difference between the first current (IL) and the first voltage (VL). The phase difference can be determined as follows. At this time, the simultaneous equations of the three equations can be organized as in mathematical expression 9.

[0100]

[0101] According to one embodiment, the electronic device (or wireless power receiving device) (103) can check the Vth value using mathematical expression 9. At this time, the method by which the electronic device (or wireless power receiving device) (103) checks Zac1, Zac2, and Zac3 in mathematical expression 9 will be specifically described in FIG. 9 described below.

[0102] FIG. 8 is a diagram for explaining an operation of a wireless power receiving device according to one embodiment of the present invention to adjust the duty ratio and phase of a rectifier circuit.

[0103] Referring to (a) of FIG. 8, a plurality of transistors (Q1, Q2, Q3, Q4) included in a rectifier circuit (255) can be driven at a first duty ratio (D') (e.g., 50%). At this time, the rectifier circuit (255) can output a voltage signal (810) based on the first duty ratio (D'). For example, the phase difference between a current signal (820) applied to the rectifier circuit (255) and a voltage signal (810) output from the rectifier circuit (255) can be 0.

[0104] Referring to (b) of FIG. 8, according to one embodiment, the electronic device (or wireless power receiver) (103) can adjust the duty ratio of the rectifier circuit (255) (e.g., 50%->40%). For example, a plurality of transistors (Q1, Q2, Q3, Q4) included in the rectifier circuit (255) can be driven with the adjusted second duty ratio (D) (e.g., 40%). The electronic device (or wireless power receiver) (103) can check the equivalent impedance (Zac) of the load section while adjusting the duty ratio multiple times. For example, the electronic device (or wireless power receiver) (103) can check Zac1, Zac2, and Zac3 of Equation 9 while changing the duty ratio three times.

[0105] Referring to (b) of FIG. 8, according to one embodiment, the electronic device (or wireless power receiving device) (103) may adjust the phase of the rectifier circuit (255). For example, the electronic device (or wireless power receiving device) (103) may adjust the phase of the rectifier circuit (255) by delaying the voltage signal (810) based on the current signal (820). For example, the electronic device (or wireless power receiving device) (103) may adjust the phase of the rectifier circuit (255) based on the current signal (820). By delaying the voltage signal (810) by that amount, the phase of the rectifier circuit (255) can be adjusted.

[0106] According to one embodiment, the rectifier circuit (255) can output a voltage signal (820) based on the second duty ratio (D) and the delayed phase. For example, the phase difference between the current signal (820) applied to the rectifier circuit (255) and the voltage signal (830) output from the rectifier circuit (255) is It could be.

[0107] According to one embodiment, the electronic device (or wireless power receiving device) (103) can check the equivalent impedance (Zac) of the load section while adjusting the phase multiple times. For example, the electronic device (or wireless power receiving device) (103) can check Zac1, Zac2, and Zac3 of Equation 9 while changing the phase three times.

[0108] According to one embodiment, the electronic device (or wireless power receiver) (103) can check the equivalent impedance (Zac) of the load section while adjusting the duty ratio and / or phase multiple times. For example, the electronic device (or wireless power receiver) (103) can check Zac1, Zac2, and Zac3 of Equation 9 while changing the duty ratio and / or phase three times.

[0109] According to one embodiment, the electronic device (or wireless power receiving device) (103) can check the Vth value using the verified Zac1, Zac2, and Zac3.

[0110] Based on the methods described in FIGS. 6A to 8, the electronic device (or wireless power receiving device) (103) can check the Vth value and use the checked Vth value to check the coupling coefficient (k). Through this, the electronic device (or wireless power receiving device) (103) can efficiently check the coupling coefficient (k) without adding separate hardware.

[0111] FIG. 9 is a flowchart illustrating an operation of a wireless power receiving device according to one embodiment of the present invention to reduce the voltage of power output from a rectifier circuit or adjust the equivalent capacitance value of a power transmission / reception circuit based on checking a coupling coefficient.

[0112] Referring to FIG. 9, according to one embodiment, an electronic device (e.g., a wireless power receiving device (103) of FIG. 1) may determine a coupling coefficient while wirelessly receiving power from an external electronic device (e.g., a wireless power transmitting device (101) of FIG. 1). The electronic device (103) may compare the coupling coefficient with a specified value. For example, the specified value may represent a reference value for the electronic device (103) to perform an operation of reducing the magnitude of an output voltage of a rectifier circuit (e.g., a rectifier circuit (255) of FIG. 2)) or reducing an equivalent capacitance value of a power transmitting / receiving circuit (e.g., a power receiving circuit (220) of FIG. 2).

[0113] In one embodiment, in operation 901, the electronic device (103) can determine that the coupling coefficient is lower than a specified value.

[0114] According to one embodiment, in operation 903, the electronic device (103) may determine whether the coupling coefficient is confirmed to be lower than a specified value a specified number of times. For example, the specified number of times (e.g., three times) may be a number of times for rechecking to accurately determine whether the arrangement of the first coil (221) and the coil (211) is mismatched. For example, the electronic device (103) may determine whether the coupling coefficient is confirmed to be lower than a specified value a specified number of times consecutively. Alternatively, the electronic device (103) may determine whether the coupling coefficient is confirmed to be lower than a specified value a specified number of times during a pre-specified period of time.

[0115] In one embodiment, if the coupling coefficient is not determined to be lower than the specified value a specified number of times (NO of operation 903), the electronic device (103) may continue to check (or monitor) the coupling coefficient.

[0116] In one embodiment, if it is determined that the coupling coefficient is lower than a specified value a specified number of times (example of operation 903), in operation 905, the electronic device (103) may reduce the voltage of the power output from the rectifier circuit (255) or reduce the equivalent capacitance value of the power transmission / reception circuit (220).

[0117] According to the above-described method, the electronic device (or wireless power receiving device) (103) can perform an operation to increase power transmission efficiency when the coupling coefficient is confirmed to be less than a certain value. For example, the electronic device (or wireless power receiving device) (103) can set a specified number of times to not perform the operation to increase power transmission efficiency when the coupling coefficient is confirmed to be incorrect. For example, the electronic device (or wireless power receiving device) (103) can re-confirm whether the coupling coefficient is confirmed to be incorrect.

[0118] FIG. 10 is a graph showing power efficiency when the equivalent capacitance value of a power transmission / reception circuit according to one embodiment is reduced.

[0119] Referring to FIG. 10, a graph (1010) according to one embodiment may represent power transmission efficiency according to an equivalent capacitance value (Cs) of a power transmission / reception circuit (e.g., power reception circuit (220) of FIG. 2) when a coupling coefficient (e.g., 0.23) is less than a specified value (e.g., 0.4).

[0120] In one embodiment, when the coupling coefficient is less than a specified value, the power transfer efficiency when the equivalent capacitance (Cs) is 200 nF may be higher than the power transfer efficiency when the equivalent capacitance is 400 nF.

[0121] According to one embodiment, the electronic device (or wireless power receiver) (103) may control the equivalent capacitance value of the power transmission / reception circuit (220) to be from 400 nF to 200 nF if it is determined that the coupling coefficient (e.g., 0.23) is less than a specified value (e.g., 0.4). For example, the equivalent capacitance value of the power transmission / reception circuit (220) may be reduced by controlling at least one switch included in the power transmission / reception circuit to be in an open state.

[0122] According to the above-described method, the electronic device (or wireless power receiving device) (103) can perform an operation to increase power transmission efficiency when the coupling coefficient is confirmed to be less than a certain value.

[0123] Fig. 11 is a graph showing the change in power efficiency according to the coupling coefficient when the voltage of power output from a rectifier circuit according to one embodiment is reduced.

[0124] Referring to FIG. 11, according to one embodiment, a first graph (1110) may represent power transmission efficiency when the voltage of power output from a rectifier circuit (e.g., rectifier circuit (255) of FIG. 2) is not adjusted.

[0125] According to one embodiment, the second graph (1120) may represent power transmission efficiency when the voltage of power output from a rectifier circuit (e.g., rectifier circuit (255) of FIG. 2) is adjusted (e.g., reduced).

[0126] According to one embodiment, the electronic device (or wireless power receiver) (103) may adjust the voltage of the power output from the rectifier circuit (e.g., the rectifier circuit (255) of FIG. 2) to be lower than the existing voltage if the coupling coefficient (e.g., 0.23) is determined to be less than a specified value (e.g., 0.4). For example, when the coupling coefficient is 0.23, adjusting the voltage of the power output from the rectifier circuit (e.g., the rectifier circuit (255) of FIG. 2) to be lower than the existing voltage may increase the power transfer efficiency (e.g., 77->81).

[0127] According to the above-described method, the electronic device (or wireless power receiving device) (103) can perform an operation to increase power transmission efficiency when the coupling coefficient is confirmed to be less than a certain value.

[0128] The above electronic device (or wireless power receiving device) (103) can be implemented identically or similarly to the electronic device (1201, 1202, or 1204) below.

[0129] FIG. 12 is a block diagram of an electronic device (1201) within a network environment (1200) according to various embodiments. Referring to FIG. 12 , in the network environment (1200), the electronic device (1201) may communicate with the electronic device (1202) via a first network (1298) (e.g., a short-range wireless communication network), or may communicate with at least one of the electronic device (1204) or the server (1208) via a second network (1299) (e.g., a long-range wireless communication network). In one embodiment, the electronic device (1201) may communicate with the electronic device (1204) via the server (1208). According to one embodiment, the electronic device (1201) may include a processor (1220), a memory (1230), an input module (1250), an audio output module (1255), a display module (1260), an audio module (1270), a sensor module (1276), an interface (1277), a connection terminal (1278), 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 some embodiments, the electronic device (1201) may omit at least one of these components (e.g., the connection terminal (1278)), or may have one or more other components added. In some embodiments, some of these components (e.g., sensor module (1276), camera module (1280), or antenna module (1297)) may be integrated into a single component (e.g., display module (1260)).

[0130] The processor (1220) may control at least one other component (e.g., hardware or software component) of the electronic device (1201) connected to the processor (1220) by executing, for example, software (e.g., program (1240)), and may perform various data processing or operations. According to one embodiment, as at least a part of the data processing or operations, the processor (1220) may store commands or data received from other components (e.g., sensor module (1276) or communication module (1290)) in volatile memory (1232), process the commands or data stored in volatile memory (1232), and store result data in non-volatile memory (1234). According to one embodiment, the processor (1220) may include a main processor (1221) (e.g., a central processing unit or an application processor) or an auxiliary processor (1223) (e.g., a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor) that can operate independently or together with the main processor (1221). For example, when the electronic device (1201) includes the main processor (1221) and the auxiliary processor (1223), the auxiliary processor (1223) may be configured to use less power than the main processor (1221) or to be specialized for a given function. The auxiliary processor (1223) may be implemented separately from the main processor (1221) or as a part thereof.

[0131] The auxiliary processor (1223) may control at least a portion of functions or states associated with at least one component (e.g., a display module (1260), a sensor module (1276), or a communication module (1290)) of the electronic device (1201), for example, on behalf of the main processor (1221) while the main processor (1221) is in an inactive (e.g., sleep) state, or together with the main processor (1221) while the main processor (1221) is in an active (e.g., application execution) state. In one embodiment, the auxiliary processor (1223) (e.g., an image signal processor or a communication processor) may be implemented as a part of another functionally related component (e.g., a camera module (1280) or a communication module (1290)). In one embodiment, the auxiliary processor (1223) (e.g., a neural network processing unit) may include a hardware structure specialized for processing artificial intelligence models. The artificial intelligence models may be generated through machine learning. This learning can be performed, for example, on the electronic device (1201) itself where the artificial intelligence model is executed, or can be performed through a separate server (e.g., server (1208)). The learning algorithm can include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but is not limited to the examples described above. The artificial intelligence model can include multiple artificial neural network layers.The artificial neural network may be one of a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), a deep Q-network, or a combination of two or more of the above, but is not limited to the examples described above. In addition to, or alternatively to, a hardware structure, an artificial intelligence model may include a software structure.

[0132] The memory (1230) can store various data used by at least one component (e.g., the processor (1220) or the sensor module (1276)) of the electronic device (1201). The data can include, for example, software (e.g., the program (1240)) and input data or output data for commands related thereto. The memory (1230) can include a volatile memory (1232) or a non-volatile memory (1234).

[0133] The program (1240) may be stored as software in memory (1230) and may include, for example, an operating system (1242), middleware (1244), or an application (1246).

[0134] The input module (1250) can receive commands or data to be used in a component of the electronic device (1201) (e.g., a processor (1220)) from an external source (e.g., a user) of the electronic device (1201). The input module (1250) can include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0135] The audio output module (1255) can output audio signals to the outside of the electronic device (1201). The audio output module (1255) can include, for example, a speaker or a receiver. The speaker can be used for general purposes, such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. In one embodiment, the receiver can be implemented separately from the speaker or as part of the speaker.

[0136] The display module (1260) can visually provide information to an external party (e.g., a user) of the electronic device (1201). The display module (1260) may include, for example, a display, a holographic device, or a projector, and a control circuit for controlling the device. In one embodiment, the display module (1260) may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of a force generated by the touch.

[0137] The audio module (1270) can convert sound into an electrical signal, or vice versa, convert an electrical signal into sound. According to one embodiment, the audio module (1270) can acquire sound through the input module (1250), output sound through the sound output module (1255), or an external electronic device (e.g., electronic device (1202)) (e.g., speaker or headphone) directly or wirelessly connected to the electronic device (1201).

[0138] The sensor module (1276) can detect the operating status (e.g., power or temperature) of the electronic device (1201) or the external environmental status (e.g., user status) and generate an electrical signal or data value corresponding to the detected status. According to one embodiment, the sensor module (1276) can include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0139] The interface (1277) may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device (1201) with an external electronic device (e.g., the electronic device (1202)). In one embodiment, the interface (1277) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

[0140] The connection terminal (1278) may include a connector through which the electronic device (1201) may be physically connected to an external electronic device (e.g., the electronic device (1202)). In one 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).

[0141] The haptic module (1279) can convert electrical signals into mechanical stimuli (e.g., vibration or movement) or electrical stimuli that a user can perceive through tactile or kinesthetic sensations. In one embodiment, the haptic module (1279) may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

[0142] The camera module (1280) can capture still images and videos. According to one embodiment, the camera module (1280) may include one or more lenses, image sensors, image signal processors, or flashes.

[0143] The power management module (1288) can manage the power supplied to the electronic device (1201). According to one embodiment, the power management module (1288) can be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

[0144] A battery (1289) may power at least one component of the electronic device (1201). In one embodiment, the battery (1289) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0145] The communication module (1290) may support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device (1201) and an external electronic device (e.g., electronic device (1202), electronic device (1204), or server (1208)), and the performance of communication through the established communication channel. The communication module (1290) may operate independently from the processor (1220) (e.g., application processor) and may include one or more communication processors that support direct (e.g., wired) communication or wireless communication. According to one 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). Any of these communication modules may communicate with an external electronic device (1204) via a first network (1298) (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (1299) (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules may be integrated into a single component (e.g., a single chip) or implemented as multiple separate components (e.g., multiple chips). The wireless communication module (1292) may use subscriber information (e.g., an international mobile subscriber identity (IMSI)) stored in the subscriber identification module (1296) to verify or authenticate the electronic device (1201) within a communication network such as the first network (1298) or the second network (1299).

[0146] The wireless communication module (1292) can support 5G networks and next-generation communication technologies following the 4G network, such as NR access technology (new radio access technology). The NR access technology can support high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and connection of multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency communications)). The wireless communication module (1292) can support, for example, a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate. The wireless communication module (1292) may support various technologies for securing performance in high-frequency bands, such as beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module (1292) may support various requirements specified in the electronic device (1201), an external electronic device (e.g., the electronic device (1204)), or a network system (e.g., the second network (1299)). According to one embodiment, the wireless communication module (1292) can support a peak data rate (e.g., 20 Gbps or more) for eMBB realization, a loss coverage (e.g., 164 dB or less) for mMTC realization, or a U-plane latency (e.g., 0.5 ms or less for downlink (DL) and uplink (UL), or 1 ms or less for round trip) for URLLC realization.

[0147] The antenna module (1297) can transmit or receive signals or power to or from an external device (e.g., an external electronic device). In one embodiment, the antenna module (1297) may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). In one embodiment, the antenna module (1297) may include a plurality of antennas (e.g., an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network, such as the first network (1298) or the second network (1299), may be selected from the plurality of antennas, for example, by the communication module (1290). A signal or power may be transmitted or received between the communication module (1290) and an external electronic device via the selected at least one antenna. In some embodiments, in addition to the radiator, another component (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as a part of the antenna module (1297).

[0148] According to various embodiments, the antenna module (1297) may form a mmWave antenna module. In one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent a first side (e.g., a bottom side) of the printed circuit board and capable of supporting a designated high frequency band (e.g., a mmWave band), and a plurality of antennas (e.g., an array antenna) disposed on or adjacent a second side (e.g., a top side or a side side) of the printed circuit board and capable of transmitting or receiving signals in the designated high frequency band.

[0149] At least some of the above components can be interconnected and exchange signals (e.g., commands or data) with each other via a communication method between peripheral devices (e.g., a bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)).

[0150] According to one embodiment, commands or data may be transmitted or received between the electronic device (1201) and an external electronic device (1204) via a server (1208) connected to a second network (1299). Each of the external electronic devices (1202 or 1204) may be the same or a different type of device as the electronic device (1201). According to one embodiment, all or part of the operations executed in the electronic device (1201) may be executed in one or more of the external electronic devices (1202, 1204, or 1208). For example, when the electronic device (1201) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (1201) may, instead of or in addition to executing the function or service itself, request one or more external electronic devices to perform the function or at least a part of the service. One or more external electronic devices that receive the request may execute at least a portion of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device (1201). The electronic device (1201) may process the result as is or additionally and provide it as at least a portion of a response to the request. For this purpose, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device (1201) may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device (1204) may include an Internet of Things (IoT) device. The server (1208) may be an intelligent server utilizing machine learning and / or a neural network.According to one embodiment, an external electronic device (1204) or server (1208) may be included within the second network (1299). The electronic device (1201) may be applied to intelligent services (e.g., smart homes, smart cities, smart cars, or healthcare) based on 5G communication technology and IoT-related technology.

[0151] An electronic device (103) according to an embodiment may include a power transmission / reception circuit (220) including a first coil (221), a rectifier circuit (255) configured to rectify power provided from the power transmission / reception circuit, a charging circuit (244), and a control circuit (250). The control circuit according to an embodiment may be configured to wirelessly receive a first power from an external electronic device (101) through the power transmission / reception circuit. The control circuit according to an embodiment may be configured to check a first voltage and a first current applied to the rectifier circuit based on the first power. The control circuit according to an embodiment may be configured to check a coupling coefficient indicating an alignment state of the first coil and a second coil (211) included in the external electronic device based on checking the first voltage and the first current. The control circuit according to one embodiment may be configured to reduce the voltage of power output from the rectifier circuit to the charging circuit or adjust an equivalent capacitance value of the power transmission / reception circuit based on determining that the coupling coefficient is lower than a specified value.

[0152] The control circuit according to one embodiment may be configured to check equivalent impedance values ​​of a load section of the electronic device by adjusting at least one of the duty ratio or phase of the rectifier circuit multiple times. The control circuit according to one embodiment may be configured to check voltage values ​​applied to the rectifier circuit when checking the equivalent impedance values. The control circuit according to one embodiment may be configured to check the coupling coefficient based on the voltage values ​​and the equivalent impedance values.

[0153] The control circuit according to one embodiment may be configured to check three equivalent impedance values ​​for the load section by adjusting at least one of the duty ratio or the phase of the rectifier circuit at least three times. The control circuit according to one embodiment may be configured to check three voltage values ​​applied to the rectifier circuit when the three equivalent impedance values ​​are checked. The control circuit according to one embodiment may be configured to estimate the coupling coefficient using the three voltage values ​​and the three equivalent impedance values.

[0154] The control circuit according to one embodiment may be configured to adjust the duty ratio by controlling the time at which a plurality of elements included in the rectifier circuit are turned on.

[0155] The control circuit according to one embodiment may be configured to identify a first current signal corresponding to the first current. The control circuit according to one embodiment may be configured to adjust the phase of the rectifier circuit by delaying a first voltage signal corresponding to the first voltage based on the first current signal.

[0156] According to one embodiment, the control circuit may be configured to adjust the phase of the rectifier circuit such that there is no phase difference between the first current signal and the first voltage signal.

[0157] The control circuit according to one embodiment may be configured to reduce the voltage of the power output from the rectifier circuit to the charging circuit or reduce the equivalent capacitance value of the power transmission / reception circuit when the coupling coefficient is determined to be lower than the specified value a specified number of times.

[0158] The control circuit according to one embodiment may be configured to open at least one switch included in the power transmission / reception circuit to reduce the equivalent capacitance value.

[0159] The control circuit according to one embodiment may be configured to reduce the magnitude of a target voltage output from the rectifier circuit to the charging circuit based on determining that the coupling coefficient is lower than the specified value.

[0160] The control circuit according to one embodiment may be configured to determine the specified value based on the type of the external electronic device.

[0161] According to an embodiment, a method of operating an electronic device (103) may include an operation of wirelessly receiving a first power from an external electronic device (103) through a power transmission / reception circuit (220) included in the electronic device. According to an embodiment, a method of operating an electronic device may include an operation of checking a first voltage and a first current applied to a rectifier circuit (255) included in the electronic device based on the first power. According to an embodiment, a method of operating an electronic device may include an operation of checking a coupling coefficient indicating an alignment state of the first coil and a second coil (211) included in the external electronic device based on checking the first voltage and the first current. According to an embodiment, a method of operating an electronic device may include an operation of reducing a voltage of power output from the rectifier circuit to a charging circuit (244) included in the electronic device or adjusting an equivalent capacitance value of the power transmission / reception circuit based on checking that the coupling coefficient is lower than a specified value.

[0162] The operation of confirming the coupling coefficient according to one embodiment may include an operation of confirming equivalent impedance values ​​of a load section of the electronic device by adjusting at least one of a duty ratio or a phase of the rectifier circuit multiple times. The operation of confirming the coupling coefficient according to one embodiment may include an operation of confirming voltage values ​​applied to the rectifier circuit when confirming the equivalent impedance values. The operation of confirming the coupling coefficient according to one embodiment may include an operation of confirming the coupling coefficient based on the voltage values ​​and the equivalent impedance values.

[0163] The operation of confirming the coupling coefficient according to one embodiment may include an operation of confirming three equivalent impedance values ​​for the load section by adjusting at least one of the duty ratio or the phase of the rectifier circuit at least three times. The operation of confirming the coupling coefficient according to one embodiment may include an operation of confirming three voltage values ​​applied to the rectifier circuit when the three equivalent impedance values ​​are confirmed. The operation of confirming the coupling coefficient according to one embodiment may include an operation of estimating the coupling coefficient using the three voltage values ​​and the three equivalent impedance values.

[0164] The operation of checking the coupling coefficient according to one embodiment may include an operation of adjusting the duty ratio by controlling the time at which a plurality of elements included in the rectifier circuit are turned on.

[0165] The operation of verifying the coupling coefficient according to one embodiment may include verifying a first current signal corresponding to the first current. The operation of verifying the coupling coefficient according to one embodiment may include adjusting the phase of the rectifier circuit by delaying a first voltage signal corresponding to the first voltage based on the first current signal.

[0166] The operation of adjusting the phase of the rectifier circuit according to one embodiment may include an operation of adjusting the phase of the rectifier circuit so that there is no phase difference between the first current signal and the first voltage signal.

[0167] According to one embodiment, the operation of reducing the voltage of the power output from the rectifier circuit or adjusting the equivalent capacitance value of the power transmission / reception circuit may include an operation of reducing the voltage of the power output from the rectifier circuit or reducing the equivalent capacitance value of the power transmission / reception circuit when the coupling coefficient is confirmed to be lower than the specified value a specified number of times.

[0168] According to one embodiment, the operation of reducing the equivalent capacitance value of the power transmission / reception circuit may include an operation of reducing the equivalent capacitance value by opening at least one switch included in the power transmission / reception circuit.

[0169] According to one embodiment, the method of operating the electronic device may further include an operation of reducing the magnitude of a target voltage output from the rectifier circuit to the charging circuit based on determining that the coupling coefficient is lower than the specified value.

[0170] According to one embodiment, a non-transitory recording medium (1230) may store instructions that perform an operation of wirelessly receiving a first power from an external electronic device (103) through a power transmission / reception circuit (220) included in the electronic device (103), an operation of checking a first voltage and a first current applied to a rectifier circuit (255) included in the electronic device based on the first power, an operation of checking a coupling coefficient indicating an alignment state of the first coil and a second coil (211) included in the external electronic device based on checking the first voltage and the first current, and an operation of reducing a voltage of power output from the rectifier circuit to a charging circuit (244) included in the electronic device or adjusting an equivalent capacitance value of the power transmission / reception circuit based on checking that the coupling coefficient is lower than a specified value.

[0171] Electronic devices according to the various embodiments disclosed in this document may take various forms. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to the embodiments of this document are not limited to the aforementioned devices.

[0172] The various embodiments of this document and the terminology used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly indicates otherwise. In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can include any one of the items listed together in the corresponding phrase among those phrases, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used merely to distinguish one component from another, and do not limit the components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as "coupled" or "connected" to another (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0173] The term "module" used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integral component, or a minimum unit or part of such a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0174] Various embodiments of the present document may be implemented as software (e.g., a program (1240)) including one or more instructions stored in a storage medium (e.g., an internal memory (1236) or an external memory (1238)) readable by a machine (e.g., an electronic device (1201)). For example, a processor (e.g., a processor (1220)) of the machine (e.g., an electronic device (1201)) may call at least one instruction among the one or more instructions stored from the storage medium and execute it. This enables the machine to operate to perform at least one function according to the at least one called instruction. The 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. Here, 'non-transitory' simply means that the storage medium is a tangible device and does not contain signals (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently or temporarily on the storage medium.

[0175] According to one embodiment, the method according to various embodiments disclosed in this document may be provided as a computer program product. The computer program product may be traded between sellers and buyers as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)) or may be provided through an application store (e.g., Play Store). TM ) or directly between two user devices (e.g., smart phones), online distribution (e.g., downloading or uploading). In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0176] According to various embodiments, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to various embodiments, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to various embodiments, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

Claims

1. In electronic devices, A power transmission / reception circuit including a first coil; A rectifier circuit configured to rectify power provided from the above power transmission / reception circuit; charging circuit; and A control circuit is included, wherein the control circuit comprises: Through the above power transmission and reception circuit, the first power is received wirelessly from an external electronic device, Based on the above first power, the first voltage and the first current applied to the rectifier circuit are checked, Based on checking the first voltage and the first current, a coupling coefficient indicating the alignment state of the first coil and the second coil included in the external electronic device is checked, An electronic device configured to reduce the voltage of power output from the rectifier circuit to the charging circuit or to adjust the equivalent capacitance value of the power transmission / reception circuit based on determining that the coupling coefficient is lower than a specified value.

2. In the first paragraph, the control circuit, By adjusting at least one of the duty ratio or phase of the above rectifier circuit multiple times, the equivalent impedance values ​​of the load section of the electronic device are checked, When checking the above equivalent impedance values, check the voltage values ​​applied to the above rectifier circuit, An electronic device configured to determine the coupling coefficient based on the above voltage values ​​and the equivalent impedance values.

3. In any one of paragraphs 1 to 2, the control circuit, By adjusting at least one of the duty ratio or the phase of the above rectifier circuit at least three times, three equivalent impedance values ​​for the load section are confirmed, When the three equivalent impedance values ​​are confirmed, the three voltage values ​​applied to the rectifier circuit are confirmed. An electronic device configured to estimate the coupling coefficient using the three voltage values ​​and the three equivalent impedance values.

4. In any one of paragraphs 1 to 3, the control circuit, An electronic device configured to adjust the duty ratio by controlling the time at which a plurality of elements included in the above rectifier circuit are turned on.

5. In any one of paragraphs 1 to 4, the control circuit, Check the first current signal corresponding to the first current, An electronic device configured to adjust the phase of the rectifier circuit by delaying a first voltage signal corresponding to the first voltage based on the first current signal.

6. In any one of paragraphs 1 to 5, the control circuit, An electronic device configured to adjust the phase of the rectifier circuit so that there is no phase difference between the first current signal and the first voltage signal.

7. In any one of paragraphs 1 to 6, the control circuit, An electronic device configured to reduce the voltage of the power output from the rectifier circuit to the charging circuit or reduce the equivalent capacitance value of the power transmission / reception circuit when the coupling coefficient is determined to be lower than the specified value a specified number of times.

8. In any one of paragraphs 1 to 7, the control circuit, An electronic device configured to reduce the equivalent capacitance value by opening at least one switch included in the power transmission / reception circuit.

9. In any one of paragraphs 1 to 8, the control circuit, An electronic device configured to reduce the size of a target voltage output from the rectifier circuit to the charging circuit based on determining that the coupling coefficient is lower than the specified value.

10. In any one of paragraphs 1 to 9, the control circuit, An electronic device configured to determine the specified value based on the type of said external electronic device.

11. In the method of operating an electronic device, An operation of wirelessly receiving a first power from an external electronic device through a power transmission / reception circuit included in the electronic device; An operation of checking a first voltage and a first current applied to a rectifier circuit included in the electronic device based on the first power; An operation of checking a coupling coefficient representing an alignment state of the first coil and the second coil included in the external electronic device based on checking the first voltage and the first current; and An operating method of an electronic device, comprising an operation of reducing a voltage of power output from the rectifier circuit to a charging circuit included in the electronic device or adjusting an equivalent capacitance value of the power transmission / reception circuit based on determining that the coupling coefficient is lower than a specified value.

12. In the 11th paragraph, the operation of checking the coupling coefficient is as follows: An operation of checking equivalent impedance values ​​of a load section of the electronic device by adjusting at least one of the duty ratio or phase of the above rectifier circuit multiple times; An operation for checking the voltage values ​​applied to the rectifier circuit when checking the equivalent impedance values; and An operating method of an electronic device, comprising an operation of checking the coupling coefficient based on the voltage values ​​and the equivalent impedance values.

13. In any one of clauses 11 to 12, the operation of checking the coupling coefficient is: An operation of checking three equivalent impedance values ​​for the load section by adjusting at least one of the duty ratio or the phase of the above rectifier circuit at least three times; An operation of checking three voltage values ​​applied to the rectifier circuit when the three equivalent impedance values ​​are confirmed; and An operating method of an electronic device, comprising an operation of estimating the coupling coefficient using the three voltage values ​​and the three equivalent impedance values.

14. In any one of clauses 11 to 13, the operation of checking the coupling coefficient is: An operating method of an electronic device including an operation of adjusting the duty ratio by controlling the time at which a plurality of elements included in the above rectifier circuit are turned on.

15. In any one of clauses 11 to 14, the operation of checking the coupling coefficient is: An operation of checking a first current signal corresponding to the first current; and An operating method of an electronic device, comprising an operation of adjusting the phase of the rectifier circuit by delaying a first voltage signal corresponding to the first voltage based on the first current signal.

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