Electronic device for wirelessly receiving power and operating method thereof

Abstract

According to an embodiment, an electronic device configured to wirelessly receive power may comprise: an LC resonance circuit comprising a coil and a capacitor; and a power reception circuit configured to receive power from an external electronic device through the LC resonance circuit. According to an embodiment, the power reception circuit may comprise: a communication circuit comprising at least one current source and at least one capacitor connected to the LC resonance circuit; a rectifier circuit comprising a plurality of switches configured to rectify AC power received through the LC resonance circuit into DC power; and a control circuit. According to an embodiment, the control circuit may be configured to identify a first output voltage corresponding to a maximum output voltage of the rectifier circuit during one switching period of the plurality of switches while wirelessly receiving the power from the external electronic device through the LC resonance circuit. According to an embodiment, the control circuit may be configured to identify a second output voltage corresponding to a minimum output voltage of the rectifier circuit during the one switching period of the plurality of switches while wirelessly receiving the power from the external electronic device through the LC resonance circuit. According to an embodiment, the control circuit may be configured to control the at least one current source such that a first current flows in parallel through the at least one capacitor such that a difference between the first output voltage and the second output voltage is within a designated range for in-band communication with the external electronic device.

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 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] According to one embodiment, an electronic device configured to wirelessly receive power may include an LC resonant circuit including a coil and a capacitor, and a power receiving circuit configured to receive power from an external electronic device through the LC resonant circuit. According to one embodiment, the power receiving circuit may include a communication circuit including at least one capacitor and at least one current source connected to the LC resonant circuit, a rectifier circuit including a plurality of switches configured to rectify AC power received through the LC resonant circuit into DC power, and a control circuit. According to one embodiment, the control circuit may be configured to determine a first output voltage corresponding to a maximum output voltage of the rectifier circuit during one switching period of the plurality of switches while wirelessly receiving power from the external electronic device through the LC resonant circuit. According to one embodiment, the control circuit may be configured to determine a second output voltage corresponding to a minimum output voltage of the rectifier circuit during one switching period of the plurality of switches while wirelessly receiving the power from the external electronic device through the LC resonant circuit. In one embodiment, the control circuit may be configured to control the at least one current source to conduct a first current in parallel to the at least one capacitor such that a difference between the first output voltage and the second output voltage is within a specified range for in-band communication with the external electronic device.

[0007] According to one embodiment, a method of operating an electronic device configured to wirelessly receive power may include an operation of checking a first output voltage corresponding to a maximum output voltage of a rectifier circuit (255) included in an electronic device (130) during one switching period of a plurality of switches (Q1, Q2, Q3, Q4) included in the electronic device while wirelessly receiving power from an external electronic device (101) through an LC resonant circuit (220) included in the electronic device. According to one embodiment, the method of operating the electronic device may include an operation of checking a second output voltage corresponding to a minimum output voltage of the rectifier circuit during one switching period of the plurality of switches while wirelessly receiving the power from the external electronic device through the LC resonant circuit. According to one embodiment, the method of operating the electronic device may include controlling at least one current source of the communication circuit to conduct a first current in parallel to at least one capacitor of the communication circuit included in the electronic device such that a difference between the first output voltage and the second output voltage is within a specified range for in-band communication with the external electronic device.

[0008] According to one embodiment, a non-transitory recording medium storing instructions, wherein the instructions, when collectively or individually executed by at least one processor, cause an electronic device (130) to, while wirelessly receiving power from an external electronic device (101) through an LC resonant circuit (220) included in the electronic device, determine a first output voltage corresponding to a maximum output voltage of a rectifier circuit (255) included in the electronic device (130) during one switching period of a plurality of switches (Q1, Q2, Q3, Q4) included in the rectifier circuit, while wirelessly receiving the power from the external electronic device through the LC resonant circuit, determine a second output voltage corresponding to a minimum output voltage of the rectifier circuit during the one switching period of the plurality of switches, and cause at least one current source of the communication circuit included in the electronic device to conduct a first current in parallel to at least one capacitor of the communication circuit included in the electronic device such that a difference between the first output voltage and the second output voltage is within a specified range for in-band communication with the external electronic device. It can be caused to perform a controlling operation, and the equivalent capacitance of the LC resonant circuit and the communication circuit is changed by the conduction of the first current, and the difference between the first output voltage and the second output voltage can be adjusted as the equivalent capacitance is changed.

[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 one embodiment.

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

[0011] FIGS. 3A and 3B are drawings for explaining an active capacitor circuit according to one embodiment.

[0012] FIG. 4 is a graph showing current being conducted through a current source corresponding to an active capacitor circuit according to one embodiment.

[0013] FIG. 5 is a flowchart illustrating a method for adjusting equivalent capacitance in an electronic device that receives power wirelessly according to one embodiment.

[0014] FIG. 6 is a block diagram of an electronic device for wirelessly transmitting power and an electronic device for wirelessly receiving power according to one embodiment.

[0015] FIG. 7 is a diagram showing a current source corresponding to an active capacitor circuit according to one embodiment.

[0016] FIG. 8 is a flowchart illustrating a method for determining a first current to be conducted through a current source by an electronic device that receives power wirelessly according to one embodiment.

[0017] FIG. 9 is a block diagram of an electronic device for wirelessly transmitting power and an electronic device for wirelessly receiving power according to one embodiment.

[0018] FIG. 10 is a block diagram of an electronic device for wirelessly transmitting power and an electronic device for wirelessly receiving power according to one embodiment.

[0019] FIG. 11 is a block diagram of an electronic device for wirelessly transmitting power and an electronic device for wirelessly receiving power according to one embodiment.

[0020] FIG. 12 is a graph showing the output voltage of a rectifier circuit that changes as the first current flowing through the current source is adjusted according to one embodiment.

[0021] FIG. 13 is a block diagram of an electronic device within a network environment according to various embodiments.

[0022] 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.

[0023] 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).

[0024] 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.

[0025] 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.

[0026] FIG. 2 is a block diagram of a wireless power transmission device and a wireless power reception device according to one embodiment.

[0027] Referring to FIG. 2, according to one embodiment, a wireless power transmission device (101) may include a TX circuit (210), a first coil (211), and a capacitor (212).

[0028] 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.

[0029] According to one embodiment, AC power generated by the TX circuit (210) may be applied to the first coil (211). The capacitor (212) may be a series compensation capacitor of the first coil (211). The first 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 first coil (211) may be applied to the second coil (221) of the wireless power receiving device (103). As the magnetic field applied to the second 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 second coil (221) of the wireless power receiving device (103). Depending on the implementation, the wireless power receiving device (103) may further include at least one coil in addition to the second coil (221). For example, a portion of the magnetic field (or magnetic flux) formed by the first coil (211) can be applied to at least one coil of the wireless power receiving device (103), and the wireless power receiving device (103) can obtain power based on this.

[0030] According to one embodiment, the TX circuit (210) can check information provided by the wireless power receiving device (103) through the first coil (211). The TX circuit (210) can, for example, perform analog-to-digital converting (ADC) on a signal received through the first 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. The decoding method can be, for example, based on the Qi standard, but those skilled in the art will understand that there is no limitation.

[0031] According to one embodiment, the wireless power receiver (103) may include at least one of an LC resonant circuit (220), a communication circuit (230), a rectifier circuit (255), a control circuit (250), a capacitor (241), a regulator (242), or a charging circuit (244).

[0032] In one embodiment, the LC resonant circuit (220) can provide AC power to the rectifier circuit (255) based on the induced electromotive force (e.g., current, voltage, or power) generated by the second coil (221).

[0033] According to one embodiment, the LC resonant circuit (220) may include a second coil (221), a first capacitor (C1), and a second capacitor (C2). According to one embodiment, the second coil (221), the first capacitor (C1), and the second capacitor (C2) may configure an LC resonant circuit corresponding to a frequency specified by the wireless power transmission device (101). At this time, the second coil (221), the first capacitor (C1), and the second capacitor (C2) may further connect a third capacitor (C3) and / or a fourth capacitor (C4) included in the communication circuit (230) to configure an LC resonant circuit corresponding to a frequency specified by the wireless power transmission device (101).

[0034] According to another embodiment, the LC resonant circuit (220) may include only the second coil (221) and the first capacitor (C1). According to one embodiment, the second coil (221) and the first capacitor (C1) may form an LC resonant circuit corresponding to a frequency specified by the wireless power transmission device (101). In this case, the second coil (221) and the first capacitor (C1) may further connect a third capacitor (C3) and / or a fourth capacitor (C4) included in the communication circuit (230) to form an LC resonant circuit corresponding to a frequency specified by the wireless power transmission device (101).

[0035] In one embodiment, the communication circuit (230) may be configured to adjust the equivalent impedance viewed from the wireless power transmission device (101) to adjust the output voltage (VRECT) of the rectifier circuit (255) for in-band communication. For example, the communication circuit (230) may be configured to adjust the equivalent capacitance of the wireless power transmission circuit (e.g., the equivalent capacitance of the LC resonant circuit (220) and the communication circuit (230).

[0036] According to one embodiment, the communication circuit (230) may include at least one of a third capacitor (C3), a first switch (S1) connected to the third capacitor (C3), a fourth capacitor (C4), and a second switch (S2) connected to the fourth capacitor (C4). For example, the communication circuit (230) may include only one set (e.g., a capacitor and a switch connected thereto) of the third capacitor (C3) and the first switch (S1) or the fourth capacitor (C4) and the second switch (S2).

[0037] According to one embodiment, the communication circuit (230) may further include a first current source (231) connected in parallel to a third capacitor (C3) and a second current source (232) connected in parallel to a fourth capacitor (C4). For example, at least one of the first current source (231) and the second current source (232) may conduct a current of a specific magnitude in parallel to at least one capacitor (C3 and / or C4) under the control of the control circuit (250).

[0038] According to one embodiment, the control circuit (250) may alternately turn on / off a plurality of switches (Q1, Q2, Q3, Q4) included in the rectifier circuit (255) while wirelessly receiving power from the wireless power transmitter (101) through the LC resonant circuit (220). For example, the control circuit (250) may turn on one switch (Q1, Q3) and turn off the other switches (Q2, Q4) for a first time period. The control circuit (250) may turn on one switch (Q2, Q4) and turn off the other switches (Q1, Q3) for a second time period that is different from the first time period. The control circuit (250) may check the first output voltage (VRECT) of the rectifier circuit (255) while the plurality of switches (Q1, Q2, Q3, Q4) are turned on / off. For example, a signal representing the output voltage (VRECT) of the rectifier circuit (255) may have ripples. At this time, in one cycle of the signal representing the output voltage (VRECT), the maximum value of the signal may be the first output voltage, and the minimum value of the signal may be the second output voltage.

[0039] Meanwhile, for convenience of explanation, the communication circuit (230) will be described below as including a third capacitor (C3), a fourth capacitor (C4), a first switch (S1), a second switch (S2), a first current source (231), and a second current source (232). However, it may be included in the technical scope of the present invention as understood by those skilled in the art that the communication circuit (230) is changed to include at least some of the above-described components.

[0040] According to one embodiment, the first capacitor (C1) and the second capacitor (C2) may be connected in parallel with each other. One end of the first capacitor (C1) may be connected to the second coil (221), and the other end of the first capacitor (C2) may be connected to the second capacitor (C2), the first input terminal of the rectifier circuit (255), and the communication circuit (230) (e.g., the third capacitor (C3) and the first current source (231)). One end of the second capacitor (C2) may be connected to the second coil (221), the second input terminal of the rectifier circuit (255), and the communication circuit (230) (e.g., the fourth capacitor (C4) and the second current source (232)), and the other end of the second capacitor (C2) may be connected to the first capacitor (C1), the first input terminal of the rectifier circuit (255), and the communication circuit (230) (e.g., the third capacitor (C3) and the first current source (231)).

[0041] According to one embodiment, the third capacitor (C3) may be connected in series with the first switch (S1). The fourth capacitor (C4) may be connected in series with the second switch (S2). For example, each of the first switch (S1) and the second switch (S2) may be implemented as a metal oxide semiconductor field effect transistor (MOSFET).

[0042] According to one embodiment, each of the first current source (231) and the second current source (232) may function as an active capacitor configured to generate a virtual capacitance. For example, each of the first current source (231) and the second current source (232) may include an operational transconductance amplifier (OTA).

[0043] According to one embodiment, a rectifier circuit (or rectifier) ​​(255) can rectify power received from a wireless charging device through a plurality of switches (Q1, Q2, Q3, Q4) controlled by a control circuit (250). The rectifier circuit (255) can rectify (or convert) AC power received from the wireless charging device into DC power and output or provide the rectified DC power to a regulator (242).

[0044] According to one embodiment, the rectifier circuit (255) may include a plurality of switches (or 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 switches (or a plurality of transistors) (Q1, Q2, Q3, Q4) may be implemented as a metal oxide semiconductor field effect transistor (MOSFET).

[0045] 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 regulator (242), 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 switch (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 second 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) (and the second coil (222)). The rectifier circuit (255) may convert AC power received through the first coil (221) and / or the second coil (222) 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) can rectify a power signal (e.g., an AC signal or AC power) received from the receiving coil (221) and supply the rectified power signal (e.g., a DC signal or DC power) to the regulator (242).

[0046] According to one embodiment, the control circuit (250) can check the output voltage (VRECT) of the power output from the rectifier circuit (255). For example, the output voltage (VRECT) may be a voltage applied to the capacitor (241). The control circuit (250) can check the output voltage (VRECT) based on the voltage applied across the regulator (242). For example, the wireless power receiving device (103) may further include a sensing circuit (not shown) for sensing the output voltage (VRECT). For example, the control circuit (250) may include a resistor in the sensing circuit and check the voltage value applied to the resistor to check the output voltage (VRECT). The output voltage (VRECT) may vary depending on the operation (e.g., on / off operation) of the switches (or transistors) (Q1, Q2, Q3, Q4) of the rectifier circuit (255). The control circuit (250) can check the first output voltage, which is the maximum value of the output voltage (VRECT), and the second output voltage, which is the minimum value.

[0047] According to one embodiment, each of the plurality of transistors (Q1, Q2, Q3, Q4) may be implemented as a switch (or 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.

[0048] According to one embodiment, a capacitor (241) and a regulator (242) 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). The regulator (242) may perform voltage conversion (e.g., buck converting and / or boost converting) and / or regulating of the voltage of the rectified power output from the rectifier circuit (255).

[0049] According to one embodiment, a charging circuit (or charger) (244) can charge a battery (not shown) using power converted and / or regulated by a regulator (242). According to various embodiments, the charging circuit (244) can control a voltage and / or current for charging the battery depending on a charging mode of the battery (e.g., constant current (CC) mode, constant voltage (CV) mode, or rapid charge mode). Depending on the implementation, a PMIC (not shown) may be connected to the regulator (242) instead of the charging circuit (244).

[0050] According to one embodiment, the control circuit (250) may control at least one current source (231 and / or 232) to conduct a current of a specific magnitude in parallel to at least one capacitor (C3 and / or C4) such that a difference between the first output voltage and the second output voltage (e.g., a ripple magnitude of a signal corresponding to the output voltage) is within a specified range for in-band communication with the wireless power transmitter (101). For example, as the current of the specific magnitude is conducted in parallel to the at least one capacitor (C3 and / or C4), an equivalent capacitance of the LC resonant circuit (220) and the communication circuit (230) may be changed. Additionally, as the equivalent capacitance is changed, a difference between the first output voltage and the second output voltage may be adjusted (e.g., adjusted within a specified range). Meanwhile, when a current of a specific size is passed in parallel to a capacitor (C3 or C4) through a current source (231 or 232), the change in equivalent capacitance will be described in more detail in FIG. 3a and FIG. 3b below.

[0051] 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 (C1, C2, C3, C4) and coils (221) illustrated in FIG. 2 are merely exemplary, and embodiments of the present invention may not be limited thereto.

[0052] FIGS. 3A and 3B are drawings for explaining an active capacitor circuit according to one embodiment.

[0053] Referring to FIG. 3A, according to one embodiment, the magnitude of the current flowing through the capacitor may be proportional to the voltage variation (e.g., dv / dt) applied across the capacitor and the capacitance (C) of the capacitor. For example, as in Equation 1 below, the current (i) flowing through the capacitor may be proportional to the voltage variation (dv / dt) applied across the capacitor and the capacitance (C) of the capacitor.

[0054]

[0055] According to one embodiment, referring to (a) of FIG. 3a, for a voltage variation (dv / dt) applied across a capacitor having a specific capacitance (C), a current (i) having a specific magnitude (or a specific value) can be conducted. Referring to (b) of FIG. 3b, for the same voltage variation (dv / dt), a current (2i) having a magnitude twice that of the specific magnitude can be conducted through a capacitor having twice the capacitance (2C).

[0056] Referring to (a) of FIG. 3B, according to one embodiment, for a voltage variation (dv / dt) applied across a capacitor having twice the capacitance (2C), a current (2i) having twice the magnitude can be conducted. Referring to (b) of FIG. 3B, from the perspective of the same voltage variation (dv / dt) and the resulting conducted current (2i), the circuit of FIG. 3B (b) can be recognized as the same circuit as one having twice the capacitance (2C) by conducting a current (i) of a specific magnitude in parallel to the capacitor through an active capacitor circuit (330) (e.g., the current source (231 or 232) of FIG. 2). That is, the circuit can have the same equivalent capacitance as one having twice the capacitance (2C) without having a separate physical capacitance in parallel to the capacitor.

[0057] According to one embodiment, the active capacitor circuit (330) may include a current source (e.g., current source (231 or 232) of FIG. 2) for conducting a current of a specific size. For example, the active capacitor circuit (330) may conduct a current of a specific size in parallel with the capacitor (C3 or C4) under the control of a control circuit (control circuit (250) of FIG. 2). Alternatively, the active capacitor circuit (330) may sense a current conducted to the capacitor (C3 or C4) and conduct a current of a required size in parallel with the capacitor (C3 or C4) based on the sensed current.

[0058] According to the above-described method, the wireless power receiving device of the present invention (e.g., the wireless power receiving device (103) of FIG. 2) can adjust the equivalent capacitance of the communication circuit (230) by conducting a current (i) of a specific size in parallel to the capacitor through an active capacitor circuit (330) (e.g., the current source (231 or 232) of FIG. 2) even without further providing a separate physical capacitor to the communication circuit (230).

[0059] FIG. 4 is a graph showing current being conducted through a current source corresponding to an active capacitor circuit according to one embodiment.

[0060] Referring to FIG. 4, according to one embodiment, a wireless power receiving device (e.g., a wireless power receiving device (103) of FIG. 2) may receive current (e.g., a positive current among AC currents) through a first input terminal of a rectifier circuit (e.g., a rectifier circuit (255) of FIG. 2) while wirelessly receiving power from a wireless power transmitting device (e.g., a wireless power transmitting device (101) of FIG. 2).

[0061] According to one embodiment, a current may be conducted through at least one capacitor (C3 and / or C4) of a communication circuit (e.g., the communication circuit (230) of FIG. 2). The wireless power receiving device (103) may conduct a current of a specific magnitude through a current source corresponding to the active capacitor circuit (e.g., the active capacitor current (330) of FIG. 3) in order to adjust the equivalent capacitance of the communication circuit (230). For example, as a current of a specific magnitude is conducted in parallel to the capacitor through the current source, the equivalent capacitance of the communication circuit (230) may be changed. For example, the current conducted through the current source may be conducted in a positive direction (or a negative direction). However, the technical features of the present invention may not be limited thereto. Depending on the implementation, the current conducted through the current source may be conducted in both a positive direction and a negative direction.

[0062] According to one embodiment, the magnitude of the current conducted in parallel with the capacitor through the current source may be determined based on the ripple magnitude (e.g., the difference between the first output voltage and the second output voltage) of the signal representing the output voltage (VRECT) output from the rectifier circuit (255). For example, the magnitude of the current conducted through the current source may be determined or adjusted such that the ripple magnitude (e.g., the difference between the first output voltage and the second output voltage) can be within a range specified for in-band communication.

[0063] Meanwhile, the operation of the electronic device (or wireless power receiving device) (101) that receives power wirelessly, as described below, can be controlled by a control circuit (250). However, for convenience of explanation, the subject of the operation will be described as the electronic device (or wireless power receiving device) (101) that receives power wirelessly.

[0064] FIG. 5 is a flowchart illustrating a method for adjusting equivalent capacitance in an electronic device that receives power wirelessly according to one embodiment.

[0065] Referring to FIG. 5, according to one embodiment, in operation 501, an electronic device (e.g., a wireless power receiving device (103) of FIG. 2) that wirelessly receives power from an external electronic device (e.g., a wireless power transmitting device (101) of FIG. 2) through an LC resonant circuit (e.g., an LC resonant circuit (220) of FIG. 2), may determine a first output voltage corresponding to a maximum output voltage of a rectifier circuit (255) during one switching period of a plurality of switches (e.g., Q1, Q2, Q3, Q4 of FIG. 2) included in a rectifier circuit (e.g., a rectifier circuit (255) of FIG. 2). For example, one switching period of the plurality of switches (Q1, Q2, Q3, Q4) may represent one period of alternately turning on / off the plurality of switches (Q1, Q2, Q3, Q4). For example, the electronic device (103) can check the first output voltage of the rectifier circuit (255) while alternately turning on / off a plurality of switches (Q1, Q2, Q3, Q4) included in the rectifier circuit (e.g., the rectifier circuit (255) of FIG. 2) while receiving power wirelessly through the LC resonant circuit (220). For example, the first output voltage can indicate an output voltage (VRECT) corresponding to a maximum value when the output voltage of the rectifier circuit (255) increases. For example, the first output voltage can indicate a maximum value of the output voltage (VRECT) when the output voltage (VRECT) of the rectifier circuit (255) increases as the first switch (Q1) and the third switch (Q3) are turned on and the second switch (Q2) and the fourth switch (Q4) are turned off.

[0066] According to one embodiment, in operation 503, the electronic device (103) may check a second output voltage corresponding to a minimum output voltage of the rectifier circuit (255) during one switching period of the plurality of switches (Q1, Q2, Q3, Q4) while wirelessly receiving power through the LC resonant circuit (220). For example, the electronic device (103) may check the second output voltage of the rectifier circuit (255) while alternately turning on / off the plurality of switches (Q1, Q2, Q3, Q4) included in the rectifier circuit (255) while wirelessly receiving power through the LC resonant circuit (220). For example, the second output voltage may represent an output voltage (VRECT) corresponding to a minimum value when the output voltage of the rectifier circuit (255) decreases. For example, the second output voltage may represent the minimum value of the output voltage (VRECT) when the output voltage (VRECT) of the rectifier circuit (255) decreases as the first switch (Q1) and the third switch (Q3) are turned off and the second switch (Q2) and the fourth switch (Q4) are turned on.

[0067] According to one embodiment, in operation 505, the electronic device (103) may control at least one current source (e.g., 231, 232 of FIG. 2) of the communication circuit (230) to conduct a first current in parallel to at least one capacitor (e.g., the third capacitor (C3) and / or the fourth capacitor (C4) of FIG. 2) of the communication circuit (230) such that a difference between the first output voltage and the second output voltage is within a designated range for in-band communication with the external electronic device (101). For example, the first current may represent a current that allows a difference between the first output voltage and the second output voltage to be within a designated range for in-band communication with the external electronic device (101). For example, as the first current is conducted in parallel to the at least one capacitor, an equivalent capacitance of the LC resonant circuit (220) and the communication circuit (230) may be changed. Additionally, as the equivalent capacitance changes, the difference between the first output voltage and the second output voltage (e.g., the ripple size of the signal representing the output voltage of the rectifier circuit (255)) can be adjusted.

[0068] Through the above-described method, the electronic device (103) can ensure that the difference between the first output voltage and the second output voltage (e.g., the ripple size of the signal representing the output voltage of the rectifier circuit (255)) remains within a specified range, even without providing an additional capacitor and switch to the communication circuit (230). Through this, the electronic device (103) can improve the quality of in-band communication with the external electronic device (101) for wireless charging.

[0069] FIG. 6 is a block diagram of an electronic device for wirelessly transmitting power and an electronic device for wirelessly receiving power according to one embodiment.

[0070] Referring to FIG. 6, according to one embodiment, the communication circuit (230-1) may further include a first current sensing circuit (233) and a second current sensing circuit (234) compared to the communication circuit (230) of FIG. 2. For example, the first current sensing circuit (233) and the first current source (231) may be configured as active capacitor circuits for the third capacitor (C3). For example, the second current sensing circuit (234) and the second current source (232) may be configured as active capacitor circuits for the fourth capacitor (C4).

[0071] According to one embodiment, the first current sensing circuit (233) can sense the current conducted to the third capacitor (C3). The first current sensing circuit (233) can obtain information on the k value based on the difference between the first output voltage and the second output voltage from the control circuit (250). The first current sensing circuit (233) can control the first current source (231) so that the first current, which is the amplified current sensed based on the k value, is conducted in parallel to the third capacitor (C3). For example, the first current sensing circuit (233) can control the first current source (231) so that the first current, whose magnitude corresponds to the product of the sensed current and the k value, is conducted in parallel to the third capacitor (C3). Accordingly, the first current source (231) can conduct the first current in parallel to the third capacitor (C3).

[0072] According to one embodiment, the second current sensing circuit (234) can sense the current conducted to the fourth capacitor (C4). The second current sensing circuit (234) can obtain information about the k value based on the difference between the first output voltage and the second output voltage from the control circuit (250). The second current sensing circuit (234) can control the second current source (232) so that the first current, which is the amplified current sensed based on the k value, is conducted in parallel to the second capacitor (C4). For example, the second current sensing circuit (234) can control the second current source (232) so that the first current, whose magnitude corresponds to a value obtained by multiplying the sensed current by the k value, is conducted in parallel to the fourth capacitor (C4). Accordingly, the second current source (232) can conduct the first current in parallel to the fourth capacitor (C4).

[0073] Through the above-described method, the electronic device (103) can ensure that the difference between the first output voltage and the second output voltage (e.g., the ripple size of the signal representing the output voltage of the rectifier circuit (255)) remains within a specified range, even without providing an additional capacitor and switch to the communication circuit (230). Through this, the electronic device (103) can improve the quality of in-band communication with the external electronic device (101) for wireless charging.

[0074] FIG. 7 is a diagram illustrating an active capacitor circuit according to one embodiment.

[0075] Referring to FIG. 7, according to one embodiment, a portion for a third capacitor (C3), a first switch (S1), and an active capacitor circuit (730) may be illustrated. For example, the active capacitor circuit (730) may include an operational transconductance amplifier (OTA) (730). For example, the active capacitor circuit (730) may include a first current source (231) and a first current sensing circuit (233) of FIG. 6.

[0076] According to one embodiment, the OTA (730) can output a first current (i1) based on a voltage (Vs) corresponding to a second current (i2) that is conducted to a third capacitor (C3) and a k value. For example, the k value can be a value for controlling or amplifying the first current (i1). For example, the k value can be a value for controlling or amplifying the second current that is conducted to the capacitor (C3) in an equivalent circuit. For example, the OTA (730) can output the first current (i1) based on multiplying the second current by the k value.

[0077] According to one embodiment, the configuration for the active capacitor circuit (730) can be equally applied to the second current source (232) and the first current sensing circuit (234).

[0078] Meanwhile, the OTA (730) illustrated in FIG. 7 is an example for implementing an active capacitor circuit, and embodiments of the present invention may not be limited thereto.

[0079] FIG. 8 is a flowchart illustrating a method for determining a first current to be conducted through a current source by an electronic device that receives power wirelessly according to one embodiment.

[0080] Referring to FIG. 8, according to one embodiment, in operation 801, an electronic device (e.g., a wireless power receiving device of FIG. 2) may control at least one current source (e.g., a first current source (231) and / or a second current source (232) of FIG. 2) to conduct current in parallel to at least one capacitor (e.g., a third capacitor (C3) and / or a fourth capacitor (C4)) based on a predetermined default k value while receiving power wirelessly.

[0081] According to one embodiment, in operation 803, the electronic device (103) can determine the difference between the first output voltage and the second output voltage of the rectifier circuit (e.g., the rectifier circuit (255) of FIG. 2).

[0082] According to one embodiment, in operation 805, the electronic device (103) can determine whether a difference between the first output voltage and the second output voltage is less than a minimum value of a specified range.

[0083] In one embodiment, if the difference between the first output voltage and the second output voltage is determined to be less than a minimum value of a specified range (e.g., in operation 805), in operation 807, the electronic device (103) can increase the k value and control at least one current source to conduct an increased current (or a more amplified current) in parallel to at least one capacitor based on the increased k value.

[0084] According to one embodiment, the electronic device (103) may determine whether the difference between the first output voltage and the second output voltage is less than the minimum value of a specified range after increasing the k value. If it is determined that the difference between the first output voltage and the second output voltage is less than the minimum value of the specified range, the electronic device (103) may increase the k value until the difference is no longer less than the minimum value of the specified range. For example, the electronic device (103) may increase the k value by a specified amount at least once.

[0085] According to one embodiment, if it is determined that the difference between the first output voltage and the second output voltage is not less than the minimum value of the specified range (NO in operation 805), then in operation 809 the electronic device (103) can determine whether the difference is greater than the maximum value of the specified range.

[0086] In one embodiment, if the difference between the first output voltage and the second output voltage is determined to be greater than a maximum value of a specified range (e.g., in operation 809), in operation 811, the electronic device (103) can control at least one current source to decrease the k value and conduct a reduced current (or a less amplified current) in parallel to at least one capacitor based on the decreased k value.

[0087] According to one embodiment, the electronic device (103) may determine whether the difference between the first output voltage and the second output voltage is greater than the maximum value of a specified range after decreasing the k value. If it is determined that the difference between the first output voltage and the second output voltage is greater than the maximum value of the specified range, the electronic device (103) may decrease the k value until the difference is no longer greater than the maximum value of the specified range. For example, the electronic device (103) may decrease the k value by a specified amount at least once.

[0088] According to one embodiment, if it is determined that the difference between the first output voltage and the second output voltage is not greater than the maximum value of the specified range (NO in operation 809), in operation 813, the electronic device (103) may determine the corresponding k value as a value for amplifying the current. In addition, the electronic device (103) may control at least one current source to conduct the first current, which is the amplified current based on the corresponding k value, in parallel to at least one capacitor. Depending on the implementation, if the k value is adjusted (e.g., increased or decreased) by operations 807 and 811, the electronic device (103) may omit the operation of determining the k value, such as operation 813.

[0089] Through the above-described method, the electronic device (103) can adjust the equivalent capacitance of the LC resonant circuit (220) and the communication circuit (230) so that the difference between the first output voltage and the second output voltage is within a specified range. Through this, the electronic device (103) can improve the quality of in-band communication with the external electronic device (101) for wireless charging.

[0090] FIG. 9 is a block diagram of an electronic device for wirelessly transmitting power and an electronic device for wirelessly receiving power according to one embodiment.

[0091] Referring to FIG. 9, according to one embodiment, the communication circuit (238) included in the wireless power transmission device (103) may not include the fourth capacitor (C4), the second switch (S2), the second current sensing circuit (234), and the second current source (232), compared to the communication circuit (230-1) of FIG. 6.

[0092] According to one embodiment, the wireless power receiving device (103) can adjust the equivalent capacitance of the LC resonant circuit (220) and the communication circuit (238) based on conducting the first current in parallel to the third capacitor (C3) through the first current source (231). Through this, the wireless power receiving device (103) can adjust the equivalent capacitance so that the difference between the first output voltage and the second output voltage output from the rectifier circuit (255) is within a range specified for in-band communication with the wireless power transmitting device (101).

[0093] Through the above-described method, the wireless power receiving device (103) can improve the quality of in-band communication with an external electronic device (101) for wireless charging.

[0094] Although FIG. 9 illustrates that the communication circuit (238) includes a third capacitor (C3), a first switch (S1), a first current sensing circuit (233), and a first current source (231), the technical idea of ​​the present invention may not be limited thereto. For example, the communication circuit (238) may include a fourth capacitor (C4), a second switch (S2), a second current sensing circuit (234), and a second current source (232) instead of the third capacitor (C3), the first switch (S1), the first current sensing circuit (233), and the first current source (231).

[0095] Meanwhile, in FIG. 9, the wireless power receiving device (103) is illustrated to include a rectifier circuit (255), but according to one embodiment, the wireless power receiving device (103) may include a voltage doubler instead of the rectifier circuit (255).

[0096] FIG. 10 is a block diagram of an electronic device for wirelessly transmitting power and an electronic device for wirelessly receiving power according to one embodiment.

[0097] Referring to FIG. 10, according to one embodiment, the communication circuit (239) may include a first voltage sensing circuit (236) and a second voltage sensing circuit (237) instead of the first current sensing circuit (233) and the second current sensing circuit (234) of the communication circuit (230) of FIG. 2. For example, the first voltage sensing circuit (236) and the first current source (231) may be configured as active capacitor circuits for the third capacitor (C3). For example, the second voltage sensing circuit (237) and the second current source (232) may be configured as active capacitor circuits for the fourth capacitor (C4).

[0098] According to one embodiment, the first voltage sensing circuit (236) may sense a voltage applied to the third capacitor (C3). The first voltage sensing circuit (236) may obtain information about a k value based on a difference between the first output voltage and the second output voltage from the control circuit (250). The first current sensing circuit (233) may control the first current source (231) so that a first current, which is an amplified current corresponding to the sensed voltage based on the k value, is conducted in parallel to the third capacitor (C3). For example, the first voltage sensing circuit (233) may control the first current source (231) so that a first current having a magnitude corresponding to a value obtained by multiplying the current corresponding to the sensed voltage by the k value is conducted in parallel to the third capacitor (C3). Accordingly, the first current source (231) may conduct the first current in parallel to the third capacitor (C3).

[0099] According to one embodiment, the second voltage sensing circuit (237) may sense a voltage applied to the fourth capacitor (C4). The second voltage sensing circuit (234) may obtain information about a k value based on a difference between the first output voltage and the second output voltage from the control circuit (250). The second voltage sensing circuit (237) may control the second current source (232) so that a first current, which is an amplified current corresponding to the sensed voltage based on the k value, is conducted in parallel to the second capacitor (C4). For example, the second voltage sensing circuit (237) may control the second current source (232) so that a first current, the magnitude of which corresponds to a value obtained by multiplying the current corresponding to the sensed voltage by the k value, is conducted in parallel to the fourth capacitor (C4). Accordingly, the second current source (232) may conduct the first current in parallel to the fourth capacitor (C4).

[0100] Through the above-described method, the electronic device (103) can ensure that the difference between the first output voltage and the second output voltage (e.g., the ripple size of the signal representing the output voltage of the rectifier circuit (255)) remains within a specified range, even without providing an additional capacitor and switch to the communication circuit (230). Through this, the electronic device (103) can improve the quality of in-band communication with the external electronic device (101) for wireless charging.

[0101] FIG. 11 is a block diagram of an electronic device for wirelessly transmitting power and an electronic device for wirelessly receiving power according to one embodiment.

[0102] Referring to FIG. 11, according to one embodiment, the communication circuit (239) may have voltages sensed by the first voltage sensing circuit (236) and the second voltage sensing circuit (237) different from those sensed by the first voltage sensing circuit (236) and the second voltage sensing circuit (237) of the communication circuit (230) of FIG. 10.

[0103] According to one embodiment, the first voltage sensing circuit (236) can sense the voltage applied to the fourth capacitor (C4). The first voltage sensing circuit (236) can obtain information about the k value based on the difference between the first output voltage and the second output voltage from the control circuit (250). The first current sensing circuit (233) can control the first current source (231) so that the first current, which is an amplified current corresponding to the sensed voltage based on the k value, is conducted in parallel to the third capacitor (C3). Accordingly, the first current source (231) can conduct the first current in parallel to the third capacitor (C3).

[0104] According to one embodiment, the second voltage sensing circuit (237) can sense the voltage applied to the third capacitor (C3). The second voltage sensing circuit (234) can obtain information about the k value based on the difference between the first output voltage and the second output voltage from the control circuit (250). The second voltage sensing circuit (237) can control the second current source (232) so that a first current corresponding to the sensed voltage based on the k value is amplified and conducted in parallel to the second capacitor (C4). Accordingly, the second current source (232) can conduct the first current in parallel to the fourth capacitor (C4).

[0105] Through the above-described method, the electronic device (103) can ensure that the difference between the first output voltage and the second output voltage (e.g., the ripple size of the signal representing the output voltage of the rectifier circuit (255)) remains within a specified range, even without providing an additional capacitor and switch to the communication circuit (230). Through this, the electronic device (103) can improve the quality of in-band communication with the external electronic device (101) for wireless charging.

[0106] FIG. 12 is a graph showing the output voltage of a rectifier circuit that changes as the first current flowing through the current source is adjusted according to one embodiment.

[0107] Referring to FIG. 12, a first graph (1210) according to one embodiment may represent a signal corresponding to an output voltage (VRECT) of a rectifier circuit (e.g., rectifier circuit (255) of FIG. 2) when a k value for amplifying a capacitor (e.g., a third capacitor (C3) or a fourth capacitor (C4)) is a first size. The second graph (1220) may represent a signal corresponding to the output voltage (VRECT) of the rectifier circuit (255) when the k value is a second magnitude that is greater than the first magnitude. The third graph (1230) may represent a signal corresponding to the output voltage (VRECT) of the rectifier circuit (255) when the k value is a third magnitude that is greater than the second magnitude. The fourth graph (1240) may represent a signal corresponding to the output voltage (VRECT) of the rectifier circuit (255) when the k value is a fourth magnitude that is greater than the third magnitude. For example, the signal corresponding to the output voltage (VRECT) may be an AC waveform, and there may be a difference between a maximum value (e.g., the first output voltage) and a minimum value (e.g., the second output voltage) during one cycle. For example, as the k value increases, the ripple of the signal corresponding to the output voltage (VRECT) may increase.

[0108] According to one embodiment, an electronic device that wirelessly receives power (e.g., a wireless power receiving device (103) of FIG. 2) may conduct a first current, which is amplified by using a k value, of a current conducted through a capacitor (e.g., a third capacitor (C3) or a fourth capacitor (C4)) included in a communication circuit (e.g., a communication circuit (230) of FIG. 2) in parallel to the capacitor (e.g., the third capacitor (C3) or the fourth capacitor (C4)). At this time, the electronic device (103) may adjust (e.g., increase or decrease) the difference between the maximum value (e.g., the first output voltage) and the minimum value (e.g., the second output voltage) of a signal corresponding to an output voltage (VRECT) by adjusting the k value. The difference between the maximum value (e.g., the first output voltage) and the minimum value (e.g., the second output voltage) of the signal corresponding to the output voltage (VRECT) can be utilized for in-band communication with an external electronic device that wirelessly transmits power (e.g., the wireless power transmission device (101) of FIG. 2). Accordingly, the electronic device (103) can adjust the size of the first current (or adjust the size of the k value) so that the difference can be positioned within a range specified for effective in-band communication.

[0109] Through the above-described method, the electronic device (103) can ensure that the difference between the first output voltage and the second output voltage (e.g., the ripple size of the signal representing the output voltage of the rectifier circuit (255)) remains within a specified range, even without providing an additional capacitor and switch to the communication circuit (230). Through this, the electronic device (103) can improve the quality of in-band communication with the external electronic device (101) for wireless charging.

[0110] Meanwhile, the numbers and shapes of the graphs (1210, 1220, 1330, and 1240) illustrated in FIG. 12 are exemplary, and the technical idea of ​​the present invention may not be limited thereto.

[0111] A wireless power receiving device (103) according to one embodiment may be implemented identically or similarly to the electronic device (1301) described below.

[0112] FIG. 13 is a block diagram of an electronic device (1301) within a network environment (1300) according to various embodiments. Referring to FIG. 13, in the network environment (1300), an electronic device (1301) (e.g., a wireless power receiving device (103) of FIG. 1 or a first electronic device (103) of FIG. 2) may communicate with an electronic device (1302) via a first network (1398) (e.g., a short-range wireless communication network), or may communicate with at least one of an electronic device (1304) or a server (1308) via a second network (1399) (e.g., a long-range wireless communication network). According to one embodiment, the electronic device (1301) may communicate with the electronic device (1304) via the server (1308). According to one embodiment, the electronic device (1301) may include a processor (1320), a memory (1330), an input module (1350), an audio output module (1355), a display module (1360), an audio module (1370), a sensor module (1376), an interface (1377), a connection terminal (1378), a haptic module (1379), a camera module (1380), a power management module (1388), a battery (1389), a communication module (1390), a subscriber identification module (1396), or an antenna module (1397). In some embodiments, the electronic device (1301) may omit at least one of these components (e.g., the connection terminal (1378)), or may have one or more other components added. In some embodiments, some of these components (e.g., sensor module (1376), camera module (1380), or antenna module (1397)) may be integrated into a single component (e.g., display module (1360)).

[0113] The processor (1320) may, for example, execute software (e.g., a program (1340)) to control at least one other component (e.g., a hardware or software component) of the electronic device (1301) connected to the processor (1320) and perform various data processing or operations. According to one embodiment, as at least a part of the data processing or operations, the processor (1320) may store commands or data received from other components (e.g., a sensor module (1376) or a communication module (1390)) in a volatile memory (1332), process the commands or data stored in the volatile memory (1332), and store result data in a non-volatile memory (1334). According to one embodiment, the processor (1320) may include a main processor (1321) (e.g., a central processing unit or an application processor) or an auxiliary processor (1323) (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 (1321). For example, when the electronic device (1301) includes the main processor (1321) and the auxiliary processor (1323), the auxiliary processor (1323) may be configured to use less power than the main processor (1321) or to be specialized for a given function. The auxiliary processor (1323) may be implemented separately from the main processor (1321) or as a part thereof.

[0114] The auxiliary processor (1323) may control at least a portion of functions or states associated with at least one component (e.g., the display module (1360), the sensor module (1376), or the communication module (1390)) of the electronic device (1301), for example, on behalf of the main processor (1321) while the main processor (1321) is in an inactive (e.g., sleep) state, or together with the main processor (1321) while the main processor (1321) is in an active (e.g., application execution) state. In one embodiment, the auxiliary processor (1323) (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 (1380) or a communication module (1390)). In one embodiment, the auxiliary processor (1323) (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 (1301) itself where the artificial intelligence model is executed, or can be performed through a separate server (e.g., server (1308)). 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.

[0115] The memory (1330) can store various data used by at least one component (e.g., the processor (1320) or the sensor module (1376)) of the electronic device (1301). The data can include, for example, software (e.g., the program (1340)) and input data or output data for commands related thereto. The memory (1330) can include volatile memory (1332) or non-volatile memory (1334).

[0116] The program (1340) may be stored as software in memory (1330) and may include, for example, an operating system (1342), middleware (1344), or an application (1346).

[0117] The input module (1350) can receive commands or data to be used in a component of the electronic device (1301) (e.g., a processor (1320)) from an external source (e.g., a user) of the electronic device (1301). The input module (1350) 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).

[0118] The audio output module (1355) can output audio signals to the outside of the electronic device (1301). The audio output module (1355) 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.

[0119] The display module (1360) can visually provide information to an external party (e.g., a user) of the electronic device (1301). The display module (1360) 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 (1360) 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.

[0120] The audio module (1370) can convert sound into an electrical signal, or vice versa. According to one embodiment, the audio module (1370) can acquire sound through the input module (1350), output sound through the sound output module (1355), or an external electronic device (e.g., electronic device (1302)) (e.g., speaker or headphone) directly or wirelessly connected to the electronic device (1301).

[0121] The sensor module (1376) can detect the operating status (e.g., power or temperature) of the electronic device (1301) 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 (1376) 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.

[0122] The interface (1377) may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device (1301) with an external electronic device (e.g., the electronic device (1302)). In one embodiment, the interface (1377) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

[0123] The connection terminal (1378) may include a connector through which the electronic device (1301) may be physically connected to an external electronic device (e.g., the electronic device (1302)). In one embodiment, the connection terminal (1378) may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0124] The haptic module (1379) 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 (1379) may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

[0125] The camera module (1380) can capture still images and videos. In one embodiment, the camera module (1380) may include one or more lenses, image sensors, image signal processors, or flashes.

[0126] The power management module (1388) can manage the power supplied to the electronic device (1301). According to one embodiment, the power management module (1388) can be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

[0127] A battery (1389) may power at least one component of the electronic device (1301). In one embodiment, the battery (1389) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0128] The communication module (1390) may support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device (1301) and an external electronic device (e.g., electronic device (1302), electronic device (1304), or server (1308)), and the performance of communication through the established communication channel. The communication module (1390) may operate independently from the processor (1320) (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 (1390) may include a wireless communication module (1392) (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 (1394) (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 (1304) via a first network (1398) (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (1399) (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 local area network or a wide area network)). 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 (1392) may use subscriber information (e.g., an international mobile subscriber identity (IMSI)) stored in the subscriber identification module (1396) to verify or authenticate the electronic device (1301) within a communication network such as the first network (1398) or the second network (1399).

[0129] The wireless communication module (1392) 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 communications (URLLC (ultra-reliable and low-latency communications)). The wireless communication module (1392) can support, for example, a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate. The wireless communication module (1392) 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 (1392) may support various requirements specified in the electronic device (1301), an external electronic device (e.g., the electronic device (1304)), or a network system (e.g., the second network (1399)). According to one embodiment, the wireless communication module (1392) may support a peak data rate (e.g., 20 Gbps or more) for eMBB implementation, a loss coverage (e.g., 164 dB or less) for mMTC implementation, 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 implementation.

[0130] The antenna module (1397) 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 (1397) 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 (1397) 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 (1398) or the second network (1399), may be selected from the plurality of antennas by, for example, the communication module (1390). A signal or power may be transmitted or received between the communication module (1390) and an external electronic device via the at least one selected 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 (1397).

[0131] According to various embodiments, the antenna module (1397) 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.

[0132] 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)).

[0133] According to one embodiment, commands or data may be transmitted or received between the electronic device (1301) and an external electronic device (1304) via a server (1308) connected to a second network (1399). Each of the external electronic devices (1302 or 1304) may be the same or a different type of device as the electronic device (1301). According to one embodiment, all or part of the operations executed in the electronic device (1301) may be executed in one or more of the external electronic devices (1302, 1304, or 1308). For example, when the electronic device (1301) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (1301) 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 (1301). The electronic device (1301) 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 (1301) may provide an ultra-low latency service by using distributed computing or mobile edge computing, for example. In another embodiment, the external electronic device (1304) may include an Internet of Things (IoT) device. The server (1308) may be an intelligent server utilizing machine learning and / or a neural network.According to one embodiment, an external electronic device (1304) or server (1308) may be included within the second network (1399). The electronic device (1301) 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.

[0134] According to one embodiment, an electronic device (103) configured to wirelessly receive power may include an LC resonant circuit (220) including a coil and a capacitor, and a power receiving circuit configured to receive power from an external electronic device (101) through the LC resonant circuit. According to one embodiment, the power receiving circuit may include a communication circuit (230) including at least one capacitor and at least one current source connected to the LC resonant circuit, a rectifier circuit (255) including a plurality of switches configured to rectify AC power received through the LC resonant circuit into DC power, and a control circuit (250). According to one embodiment, the control circuit may be configured to check a first output voltage corresponding to a maximum output voltage of the rectifier circuit during one switching period of the plurality of switches while wirelessly receiving power from the external electronic device through the LC resonant circuit. In one embodiment, the power may be wirelessly received from the external electronic device through the LC resonant circuit, and the second output voltage may be set to correspond to a minimum output voltage of the rectifier circuit during the one switching period of the plurality of switches. In one embodiment, the control circuit may be set to control the at least one current source to conduct a first current in parallel to the at least one capacitor such that a difference between the first output voltage and the second output voltage is within a designated range for in-band communication with the external electronic device. In one embodiment, the conduction of the first current may change an equivalent capacitance of the LC resonant circuit and the communication circuit. In one embodiment, a difference between the first output voltage and the second output voltage may be adjusted as the equivalent capacitance changes.

[0135] In one embodiment, the equivalent capacitance of the LC resonant circuit and the communication circuit can be changed based on the first current being conducted in parallel to the at least one capacitor. In one embodiment, the difference between the first output voltage and the second output voltage can be adjusted as the equivalent capacitance is changed.

[0136] In one embodiment, the control circuit may be configured to determine the difference between the first output voltage and the second output voltage while conducting a specified current in parallel to the at least one capacitor. In one embodiment, the control circuit may be configured to increase the specified current by a specified amount at least once until the difference between the first output voltage and the second output voltage is within the specified range if the difference is determined to be less than a lower value of the specified range.

[0137] In one embodiment, the control circuit may be configured to determine the difference between the first output voltage and the second output voltage while conducting a specified current in parallel to the at least one capacitor. In one embodiment, the control circuit may be configured to decrease the specified current by a specified amount at least once until the difference between the first output voltage and the second output voltage is within the specified range if the difference is determined to be higher than a maximum value of the specified range.

[0138] In one embodiment, the control circuit may be configured to sense a second current conducted through the at least one capacitor while wirelessly receiving power through the LC resonant circuit. In one embodiment, the control circuit may be configured to determine a first value for amplifying the second current based on the difference between the first output voltage and the second output voltage. In one embodiment, the control circuit may be configured to control the at least one current source to conduct the first current in parallel to the at least one capacitor based on a product of the second current and the first value.

[0139] In one embodiment, the control circuit may be configured to sense a voltage applied to the at least one capacitor while wirelessly receiving power through the LC resonant circuit. In one embodiment, the control circuit may be configured to determine a second value for amplifying the voltage based on the difference between the first output voltage and the second output voltage. In one embodiment, the control circuit may be configured to control the at least one current source to conduct the first current corresponding to a voltage obtained by multiplying the voltage by the second value in parallel to the at least one capacitor.

[0140] According to one embodiment, the at least one capacitor may include a first capacitor connected in parallel to a first input terminal of the rectifier circuit and a second capacitor connected in parallel to a second input terminal of the rectifier circuit.

[0141] In one embodiment, the control circuit may be configured to sense the third current conducted to the first capacitor and the fourth current conducted to the second capacitor while wirelessly receiving power through the LC resonant circuit. In one embodiment, the control circuit may be configured to determine a third value for amplifying the third current and a fourth value for amplifying the fourth current based on the difference between the first output voltage and the second output voltage. In one embodiment, the control circuit may be configured to control a first current source of the at least one current source to conduct a fifth current corresponding to a product of the third current and the third value in parallel to the first capacitor, and to control a second current source of the at least one current source to conduct a sixth current corresponding to a product of the fourth current and the fourth value in parallel to the second capacitor.

[0142] According to one embodiment, the first current source may be connected in parallel to the first capacitor, and the second current source may be connected in parallel to the second capacitor.

[0143] According to one embodiment, the first current source may be connected in parallel to the second capacitor, and the second current source may be connected in parallel to the first capacitor.

[0144] According to one embodiment, a method of operating an electronic device (103) configured to wirelessly receive power may include an operation of checking a first output voltage corresponding to a maximum output voltage of a rectifier circuit (255) included in an electronic device (130) during one switching period of a plurality of switches (Q1, Q2, Q3, Q4) included in the electronic device while wirelessly receiving power from an external electronic device (101) through an LC resonant circuit (220) included in the electronic device. According to one embodiment, the method of operating the electronic device may include an operation of checking a second output voltage corresponding to a minimum output voltage of the rectifier circuit during one switching period of the plurality of switches while wirelessly receiving the power from the external electronic device through the LC resonant circuit. According to one embodiment, the method of operating the electronic device may include controlling at least one current source of the communication circuit (230) included in the electronic device to conduct a first current in parallel to at least one capacitor of the communication circuit so that a difference between the first output voltage and the second output voltage is within a specified range for in-band communication with the external electronic device. According to one embodiment, the conduction of the first current may change an equivalent capacitance of the LC resonant circuit and the communication circuit. According to one embodiment, the difference between the first output voltage and the second output voltage may be adjusted as the equivalent capacitance is changed.

[0145] In one embodiment, the equivalent capacitance of the LC resonant circuit and the communication circuit can be changed based on the first current being conducted in parallel to the at least one capacitor. In one embodiment, the difference between the first output voltage and the second output voltage can be adjusted as the equivalent capacitance is changed.

[0146] According to one embodiment, the method of operating the electronic device may further include an operation of checking the difference between the first output voltage and the second output voltage while conducting a specified current in parallel to the at least one capacitor. According to one embodiment, the method of operating the electronic device may further include an operation of increasing the specified current by a specified amount at least once until the difference between the first output voltage and the second output voltage is within the specified range, if the difference is checked to be less than a lowest value of the specified range.

[0147] According to one embodiment, the method of operating the electronic device may further include an operation of checking the difference between the first output voltage and the second output voltage while conducting a specified current in parallel to the at least one capacitor. According to one embodiment, the method of operating the electronic device may further include an operation of reducing the specified current by a specified amount at least once until the difference between the first output voltage and the second output voltage is within the specified range, if the difference is checked to be higher than a maximum value of the specified range.

[0148] In one embodiment, the act of controlling the at least one current source may include sensing a second current conducted through the at least one capacitor while wirelessly receiving power through the LC resonant circuit. In one embodiment, the act of controlling the at least one current source may include determining a first value for amplifying the second current based on the difference between the first output voltage and the second output voltage. In one embodiment, the act of controlling the at least one current source may include controlling the at least one current source to conduct the first current in parallel to the at least one capacitor based on a product of the second current and the first value.

[0149] In one embodiment, the act of controlling the at least one current source may include sensing a voltage applied to the at least one capacitor while wirelessly receiving power through the LC resonant circuit. In one embodiment, the act of controlling the at least one current source may include determining a second value for amplifying the voltage based on the difference between the first output voltage and the second output voltage. In one embodiment, the act of controlling the at least one current source may include controlling the at least one current source to conduct the first current corresponding to a voltage obtained by multiplying the voltage by the second value in parallel to the at least one capacitor.

[0150] According to one embodiment, the at least one capacitor may include a first capacitor connected in parallel to a first input terminal of the rectifier circuit and a second capacitor connected in parallel to a second input terminal of the rectifier circuit.

[0151] In one embodiment, the operation of controlling the at least one current source may include sensing the third current conducted to the first capacitor and the fourth current conducted to the second capacitor while wirelessly receiving power through the LC resonant circuit. In one embodiment, the operation of controlling the at least one current source may include determining a third value for amplifying the third current and a fourth value for amplifying the fourth current based on the difference between the first output voltage and the second output voltage. In one embodiment, the operation of controlling the at least one current source may include controlling a first current source of the at least one current source to conduct a fifth current corresponding to a product of the third current times the third value in parallel to the first capacitor, and controlling a second current source of the at least one current source to conduct a sixth current corresponding to a product of the fourth current times the fourth value in parallel to the second capacitor.

[0152] According to one embodiment, the first current source may be connected in parallel to the first capacitor, and the second current source may be connected in parallel to the second capacitor.

[0153] According to one embodiment, in a non-transitory recording medium (130) storing instructions, the instructions, when collectively or individually executed by at least one processor, cause an electronic device (103) to, while wirelessly receiving power from an external electronic device (101) through an LC resonant circuit (220) included in the electronic device (130), check a first output voltage corresponding to a maximum output voltage of a rectifier circuit (255) included in the electronic device (130) during one switching period of a plurality of switches (Q1, Q2, Q3, Q4) included in the electronic device (103), while wirelessly receiving the power from the external electronic device through the LC resonant circuit, check a second output voltage corresponding to a minimum output voltage of the rectifier circuit during the one switching period of the plurality of switches, and cause at least one capacitor of a communication circuit (230) included in the electronic device to be connected such that a difference between the first output voltage and the second output voltage is within a specified range for in-band communication with the external electronic device. An operation of controlling at least one current source of the communication circuit to conduct a first current in parallel may be performed, wherein the equivalent capacitance of the LC resonant circuit and the communication circuit is changed by the conduction of the first current, and the difference between the first output voltage and the second output voltage may be adjusted as the equivalent capacitance is changed.

[0154] 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.

[0155] 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.

[0156] 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).

[0157] 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.

[0158] 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.

[0159] 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 an electronic device (103) set to receive power wirelessly, LC resonant circuit (220) including a coil and a capacitor; and A power receiving circuit configured to receive power from an external electronic device (101) through the LC resonant circuit, the power receiving circuit comprising: a communication circuit (230) including at least one capacitor and at least one current source connected to the LC resonant circuit; a rectifier circuit (255) including a plurality of switches configured to rectify AC power received through the LC resonant circuit into DC power; and a control circuit (250), the control circuit comprising: While receiving power wirelessly from the external electronic device through the LC resonant circuit, a first output voltage corresponding to the maximum output voltage of the rectifier circuit is checked during one switching cycle of the plurality of switches, While receiving the power wirelessly from the external electronic device through the LC resonant circuit, a second output voltage corresponding to the minimum output voltage of the rectifier circuit is checked during the one switching period of the plurality of switches, An electronic device configured to control the at least one current source to conduct a first current in parallel to the at least one capacitor such that a difference between the first output voltage and the second output voltage is within a specified range for in-band communication with the external electronic device.

2. In paragraph 1, The equivalent capacitance of the LC resonant circuit and the communication circuit is changed based on the first current being conducted in parallel to the at least one capacitor, An electronic device in which the difference between the first output voltage and the second output voltage is adjusted as the equivalent capacitance changes.

3. In any one of paragraphs 1 to 2, the control circuit, Checking the difference between the first output voltage and the second output voltage while conducting a specified current in parallel to at least one capacitor, An electronic device configured to increase the specified current by a specified amount at least once until the difference between the first output voltage and the second output voltage is within the specified range, if the difference is determined to be less than the lowest value of the specified range.

4. In any one of the first to third paragraphs, the control circuit, Checking the difference between the first output voltage and the second output voltage while conducting a specified current in parallel to at least one capacitor, An electronic device configured to reduce the specified current by a specified amount at least once until the difference between the first output voltage and the second output voltage is within the specified range, if the difference is determined to be higher than the highest value of the specified range.

5. In any one of paragraphs 1 to 4, the control circuit, While receiving power wirelessly through the LC resonant circuit, sensing a second current conducted through the at least one capacitor, Based on the difference between the first output voltage and the second output voltage, a first value for amplifying the second current is determined, An electronic device configured to control the at least one current source to conduct the first current in parallel to the at least one capacitor based on the product of the second current and the first value.

6. In any one of paragraphs 1 to 5, the control circuit, While receiving power wirelessly through the LC resonant circuit, sensing the voltage applied to the at least one capacitor, Based on the difference between the first output voltage and the second output voltage, a second value for amplifying the voltage is determined, An electronic device configured to control the at least one current source to conduct the first current in parallel to the at least one capacitor corresponding to a voltage obtained by multiplying the second value by the voltage.

7. In any one of paragraphs 1 to 6, An electronic device wherein the at least one capacitor comprises a first capacitor connected in parallel to a first input terminal of the rectifier circuit and a second capacitor connected in parallel to a second input terminal of the rectifier circuit.

8. In any one of paragraphs 1 to 7, the control circuit, While receiving power wirelessly through the LC resonant circuit, the third current conducted to the first capacitor and the fourth current conducted to the second capacitor are sensed, Based on the difference between the first output voltage and the second output voltage, a third value for amplifying the third current and a fourth value for amplifying the fourth current are determined, An electronic device configured to control a first current source of the at least one current source to conduct a fifth current corresponding to the third current multiplied by the third value in parallel to the first capacitor, and to control a second current source of the at least one current source to conduct a sixth current corresponding to the fourth current multiplied by the fourth value in parallel to the second capacitor.

9. In any one of paragraphs 1 to 8, An electronic device wherein the first current source is connected in parallel to the first capacitor, and the second current source is connected in parallel to the second capacitor.

10. In any one of paragraphs 1 to 9, An electronic device wherein the first current source is connected in parallel to the second capacitor, and the second current source is connected in parallel to the first capacitor.

11. In a method of operating an electronic device (130) set to receive power wirelessly, An operation of confirming a first output voltage corresponding to a maximum output voltage of a rectifier circuit (255) included in the electronic device (130) during one switching cycle of a plurality of switches (Q1, Q2, Q3, Q4) included in the electronic device (130) while wirelessly receiving power from an external electronic device (101) through an LC resonant circuit (220) included in the electronic device; An operation of checking a second output voltage corresponding to a minimum output voltage of the rectifier circuit during the one switching period of the plurality of switches while wirelessly receiving the power from the external electronic device through the LC resonant circuit; and A method of operating an electronic device, comprising: controlling at least one current source of a communication circuit (230) included in the electronic device to conduct a first current in parallel to at least one capacitor of the communication circuit (230) so that a difference between the first output voltage and the second output voltage is within a specified range for in-band communication with the external electronic device.

12. In paragraph 11, The equivalent capacitance of the LC resonant circuit and the communication circuit is changed based on the first current being conducted in parallel to the at least one capacitor, A method of operating an electronic device in which the difference between the first output voltage and the second output voltage is adjusted as the equivalent capacitance is changed.

13. In any one of paragraphs 11 to 12, An operation of checking the difference between the first output voltage and the second output voltage while conducting a specified current in parallel to at least one capacitor; and An operating method of an electronic device further comprising an operation of increasing the specified current by a specified amount at least once until the difference between the first output voltage and the second output voltage is within the specified range, if the difference is determined to be less than the lowest value of the specified range.

14. In any one of paragraphs 11 to 13, An operation of checking the difference between the first output voltage and the second output voltage while conducting a specified current in parallel to at least one capacitor; and An operating method of an electronic device further comprising an operation of reducing the specified current by a specified amount at least once until the difference between the first output voltage and the second output voltage is within the specified range, if the difference is determined to be higher than the highest value of the specified range.

15. In any one of paragraphs 11 to 14, the operation of controlling at least one current source comprises: An operation of sensing a second current conducted through at least one capacitor while wirelessly receiving power through the LC resonant circuit; An operation of determining a first value for amplifying the second current based on the difference between the first output voltage and the second output voltage; A method of operating an electronic device, comprising: controlling at least one current source to conduct the first current in parallel to the at least one capacitor based on the product of the second current and the first value.

16. In any one of paragraphs 11 to 15, the operation of controlling at least one current source comprises: An operation of sensing a voltage applied to at least one capacitor while wirelessly receiving power through the LC resonant circuit; An operation of determining a second value for amplifying the voltage based on the difference between the first output voltage and the second output voltage; and A method of operating an electronic device, comprising an operation of controlling at least one current source to conduct the first current corresponding to a voltage obtained by multiplying the second value by the voltage in parallel to the at least one capacitor.

17. In any one of paragraphs 11 to 16, A method of operating an electronic device, wherein the at least one capacitor includes a first capacitor connected in parallel to a first input terminal of the rectifier circuit and a second capacitor connected in parallel to a second input terminal of the rectifier circuit.

18. In any one of paragraphs 11 to 17, the operation of controlling at least one current source comprises: An operation of sensing the third current conducted to the first capacitor and the fourth current conducted to the second capacitor while wirelessly receiving power through the LC resonant circuit; An operation of determining a third value for amplifying the third current and a fourth value for amplifying the fourth current based on the difference between the first output voltage and the second output voltage; An operating method of an electronic device, comprising: controlling a first current source of the at least one current source to conduct a fifth current corresponding to the third current multiplied by the third value in parallel to the first capacitor; and controlling a second current source of the at least one current source to conduct a sixth current corresponding to the fourth current multiplied by the fourth value in parallel to the second capacitor.

19. In any one of paragraphs 11 to 18, A method of operating an electronic device, wherein the first current source is connected in parallel to the first capacitor, and the second current source is connected in parallel to the second capacitor.

20. In a non-transitory storage medium (130) that stores instructions, The above instructions, when executed collectively or individually by at least one processor, cause the electronic device (103) to: An operation of confirming a first output voltage corresponding to a maximum output voltage of a rectifier circuit (255) included in the electronic device (130) during one switching cycle of a plurality of switches (Q1, Q2, Q3, Q4) included in the electronic device (130) while wirelessly receiving power from an external electronic device (101) through an LC resonant circuit (220) included in the electronic device; An operation of checking a second output voltage corresponding to a minimum output voltage of the rectifier circuit during the one switching period of the plurality of switches while wirelessly receiving the power from the external electronic device through the LC resonant circuit; and A recording medium that causes an operation of controlling at least one current source of the communication circuit (230) included in the electronic device to conduct a first current in parallel to at least one capacitor of the communication circuit (230) so that a difference between the first output voltage and the second output voltage is within a specified range for in-band communication with the external electronic device.

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