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

Abstract

A first electronic device configured to wirelessly receive power according to an embodiment may comprise: a power reception circuit including a plurality of capacitors, at least one coil, and at least one switch; a rectifier including a plurality of transistors; and a control circuit. The control circuit according to an embodiment may be configured to configure the plurality of capacitors and the at least one coil to be in a first connection state through the at least one switch on the basis of a frequency designated by a second electronic device for wirelessly transmitting power. The control circuit according to an embodiment may be configured to wirelessly receive alternating current power from the second electronic device through the power reception circuit configured to be in the first connection state. The control circuit according to an embodiment may be configured to control the plurality of transistors included in the rectifier so as to rectify the power received from the second electronic device. The control circuit according to an embodiment may be configured to identify a first voltage of power rectified into direct current through the rectifier. The control circuit according to an embodiment may be configured to configure the plurality of capacitors and the at least one coil to be in a second connection state through the at least one switch such that impedance by the plurality of capacitors is increased, on the basis of identifying that the first voltage is greater than a first threshold value. The control circuit according to an embodiment may be configured to control the plurality of transistors included in the rectifier so as to free-wheel the power received from the second electronic device.

Description

Electronic device for receiving power wirelessly and method of operation thereof

[0001] The present disclosure relates to an electronic device that wirelessly receives power and a method of operating the same.

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

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

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

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

[0006] In one embodiment, a first electronic device configured to wirelessly receive power may include a power receiving circuit including a plurality of capacitors, at least one coil, and at least one switch, a rectifier including a plurality of transistors, and a control circuit. In one embodiment, the control circuit may be configured to set the plurality of capacitors and the at least one coil to a first connection state through the at least one switch based on a frequency designated by a second electronic device configured to wirelessly transmit power. In one embodiment, the control circuit may be configured to wirelessly receive AC power from the second electronic device through the power receiving circuit set to the first connection state. In one embodiment, the control circuit may be configured to control the plurality of transistors included in the rectifier to rectify the power received from the second electronic device. In one embodiment, the control circuit may be configured to check a first voltage of power rectified into DC through the rectifier. In one embodiment, the control circuit may be configured to set the plurality of capacitors and the at least one coil to a second connection state through the at least one switch so that an impedance by the plurality of capacitors increases based on determining that the first voltage is greater than a first threshold value. In one embodiment, the control circuit may be configured to control the plurality of transistors included in the rectifier to free-wheel the power received from the second electronic device.

[0007] According to an embodiment, a method of operating a first electronic device for wirelessly receiving power may include an operation of wirelessly receiving AC power from a second electronic device through a power receiving circuit included in the first electronic device. A plurality of capacitors and at least one coil included in the power receiving circuit according to an embodiment may be set to a first connection state corresponding to a frequency specified by the second electronic device through at least one switch. According to an embodiment, a method of operating the first electronic device may include an operation of controlling a plurality of transistors included in a rectifier included in the electronic device to rectify the power received from the second electronic device. According to an embodiment, a method of operating the first electronic device may include an operation of checking a first voltage of power rectified into DC through the rectifier included in the first electronic device. In one embodiment, the operating method of the first electronic device may include an operation of setting the plurality of capacitors and the at least one coil to a second connection state through the at least one switch so that an impedance by the plurality of capacitors increases based on determining that the first voltage is greater than a first threshold value. In one embodiment, the operating method of the first electronic device may include an operation of controlling the plurality of transistors included in the rectifier so as to free-wheel the power received from the second electronic device.

[0008] In one embodiment, a non-transitory computer-readable recording medium may store instructions that, when executed, cause a first electronic device to perform the following operations: wirelessly receiving AC power from a second electronic device through a power receiving circuit of the first electronic device, wherein a plurality of capacitors and at least one coil included in the power receiving circuit are set to a first connection state corresponding to a frequency specified by the second electronic device through at least one switch, and controlling a plurality of transistors included in a rectifier included in the electronic device to rectify the power received from the second electronic device; checking a first voltage of the power rectified into DC through the rectifier included in the first electronic device; setting the plurality of capacitors and the at least one coil to a second connection state through the at least one switch so that an impedance by the plurality of capacitors increases based on checking that the first voltage is greater than a first threshold value; and controlling the plurality of transistors included in the rectifier to free-wheel the power received from the second electronic device. there is.

[0009] The above and other aspects, features and advantages of specific embodiments of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0010] FIG. 1 is a block diagram of an electronic device for wirelessly transmitting power and an electronic device for wirelessly receiving power according to various embodiments.

[0011] FIG. 2 is a block diagram of a wireless power transmission device and a wireless power reception device according to various embodiments.

[0012] FIG. 3 is a graph illustrating a method for a wireless power receiving device according to one embodiment to freewheel power received from a wireless power transmitting device.

[0013] FIG. 4 is a circuit diagram illustrating a method for a wireless power receiving device according to one embodiment to freewheel power received from a wireless power transmitting device.

[0014] FIG. 5 is a graph showing the current flowing through the corresponding transistor while the wireless power receiving device according to the comparative example performs free-wheeling.

[0015] Figure 6 is a flowchart for explaining an operating method of a first electronic device according to one embodiment.

[0016] FIG. 7 is a graph showing a change in impedance according to an equivalent capacitance of a first electronic device according to one embodiment.

[0017] FIGS. 8A and 8B are graphs showing the current flowing through the corresponding transistor while the first electronic device performs free-wheeling, according to one embodiment.

[0018] FIG. 9 is a flowchart illustrating a method for a first electronic device according to one embodiment to increase impedance and thereby reduce the amount of current flowing through transistors during free-wheeling.

[0019] FIG. 10 is a flowchart illustrating a method for a first electronic device according to one embodiment to increase impedance and thereby reduce the amount of current flowing through transistors during free-wheeling.

[0020] FIG. 11 is a flowchart illustrating a method for reducing the coupling of a coil by a first electronic device according to one embodiment to reduce the amount of current flowing through transistors during free-wheeling.

[0021] FIG. 12 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). 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 the wireless power transmission device (101) or the wireless power reception device (103) performs a specific operation, it may mean that various hardware included in the wireless power transmission device (101) or the wireless power reception device (103), such as a controller (e.g., 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 transmission device (101) or the wireless power reception device (103) performs a specific operation, it may mean that the controller included in the wireless power transmission device (101) or the wireless power reception device (103) controls other hardware to perform a specific operation. A processor according to an embodiment of the present disclosure may include various processing circuits and / or multiple processors. For example, the term "processor," as used herein, including in the claims, may encompass various processing circuits that include at least one processor, one or more of which may be configured to individually and / or collectively perform the various functions described herein in a distributed manner. As used herein, where "processor," "at least one processor," and "one or more processors" are described as being configured to perform various functions, these terms may encompass, for example, without limitation, situations where a single processor performs some of the recited functions, other processor(s) may perform other of the recited functions, and situations may also exist where a single processor may perform all of the recited functions. Additionally, the at least one processor may comprise a combination of processors that perform the various functions enumerated / disclosed, for example, in a distributed manner.At least one processor may execute program instructions to achieve or perform various functions. Alternatively, the wireless power transmitter (101) or the 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 the 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 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, an AC power generated by a TX circuit (210) may be applied to a coil (211). A capacitor (212) may be a series compensation capacitor of the coil (211). The coil (211) may form a magnetic field based on the applied AC power. A portion of the magnetic field (or magnetic flux) formed by the coil (211) may be applied to a first coil (221) and / or a second coil (222) of the wireless power receiving device (103). As the magnetic field applied to the first coil (221) and / or the second coil (222) of the wireless power receiving device (103) changes over time, an induced electromotive force (e.g., current, voltage, or power) may be generated in the first coil (221) and / or the second coil (222) of the wireless power receiving device (103).

[0030] According to one embodiment, the TX circuit (210) can check information provided by the wireless power receiving device (103) through the coil (211). The TX circuit (210) can, for example, perform analog-to-digital converting (ADC) on a signal received through the coil (211). The TX circuit (210) can decode a digital value obtained as a result of the ADC, and can check information provided by the wireless power receiving device (103) based on 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 a power receiver circuit (220), a rectifier circuit (255), a control circuit (250), a gate driver (257), a switch controller (259), a capacitor (241), a regulator (242), and / or a charging circuit (244).

[0032] According to one embodiment, the power receiving circuit (220) may include a second coil (222), a first capacitor (223), and a second capacitor (224). According to one embodiment, the second coil (222), the first capacitor (223), and the second capacitor (224) may form an LC resonant circuit corresponding to a frequency specified by the wireless power transmission device (101). At this time, the power receiving circuit (220) may include at least one of the first switch (S1) and the second switch (S2). Depending on the implementation, the power receiving circuit (220) may further include the first coil (221) and / or the third switch (S3). Although the power receiving circuit (220) is illustrated in FIG. 2 as further including the first coil (221) and the third switch (S3), this is for convenience of explanation and the technical idea of ​​the present invention may not be limited thereto. However, for the convenience of explanation, the power receiving circuit (220) will be described below as including a first coil (221), a second coil (222), a first capacitor (223), a second capacitor (224), a first switch (S1), a second switch (S2), and a third switch (S3). However, it will be understood that a change in the configuration of the power receiving circuit (220) to include at least some of the above configurations can be included within a range understandable by those skilled in the art.

[0033] According to one embodiment, the power receiving circuit (220) may include at least one of a first coil (221), a second coil (222), a first capacitor (223), and a second capacitor (224). According to one embodiment, at least one of the first coil (221), the second coil (222), the first capacitor (223), and the second capacitor (224) may form an LC resonant circuit corresponding to a frequency specified by the wireless power transmitting device (101). The power receiving circuit (220) may include at least one of a first switch (S1), a second switch (S2), and a third switch (S3).

[0034] According to one embodiment, the first capacitor (223) and the second capacitor (224) may be connected in parallel with each other. One end of each of the first capacitor (223) and the second capacitor (224) may be connected to the first coil (221) and the second coil (222), and the other end of each of the first capacitor (223) and the second capacitor (224) may be connected to one end of a rectifier circuit (255). The first switch (S1) may be connected in series to the first capacitor (223). The second switch (S2) may be connected in parallel to each of the first capacitor (223) and the second capacitor (224).

[0035] According to one embodiment, the first coil (221) and the second coil (222) may be connected in parallel with each other. The third switch (S3) may be placed between the first coil (221) and the second coil (222).

[0036] According to one embodiment, a rectifier circuit (or rectifier) ​​(255) can rectify power received from a wireless charging device through a plurality of transistors (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).

[0037] According to one embodiment, the rectifier circuit (255) may include a plurality of transistors (Q1, Q2, Q3, Q4) that may operate as a full bridge circuit or a voltage doubler circuit. For example, each of the plurality of transistors (Q1, Q2, Q3, Q4) may be implemented as a metal oxide semiconductor field effect transistor (MOSFET).

[0038] 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 transistor (Q3) may be connected to the other end of the fourth transistor (Q4). The other end of the second transistor (Q2) and the other end of the third transistor (Q3) may be connected to ground. The other end of the first transistor (Q1) and one end of the second transistor (Q2) may be connected to one end of the first coil (221) (and the second coil (222)), 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 first coil (221) and / or the second coil (222) and supply the rectified power signal (e.g., a DC signal or DC power) to the regulator (242).

[0039] According to one embodiment, the control circuit (250) can check the first voltage (VRECT) of the power output from the rectifier circuit (255). For example, the first voltage (VRECT) may be a voltage applied to the capacitor (241). The control circuit (250) can check the first 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 first 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 first voltage (VRECT).

[0040] According to one embodiment, the control circuit (250) may control the on / off states of the plurality of transistors (Q1, Q2, Q3, Q4) so ​​as to consume the corresponding power when the voltage of the AC power received through the first coil (221) and / or the second coil (222) (or the first voltage (VRECT) of the power rectified through the rectifier circuit (255)) is higher than a predetermined threshold value. For example, the control circuit (250) may control the plurality of transistors (Q1, Q2, Q3, Q4) to free-wheel the corresponding power when the voltage of the AC power received through the first coil (221) and / or the second coil (222) (or the first voltage (VRECT) of the power rectified through the rectifier circuit (255)) is higher than a predetermined threshold value. For example, the control circuit (220) can free-wheel the power received through the first coil (221) and / or the second coil (222) by short-circuiting the transistors (Q2, Q3) arranged on the low side to ground (e.g., controlling them to an on state). The control circuit (220) can control the transistors (Q1, Q4) arranged on the high side to an off state while free-wheeling the power. While free-wheeling the power, the rectification operation of the rectifier circuit (255) can be stopped. When the rectification operation is stopped, the charge stored in the capacitor (241) is discharged, and thus the output voltage of the rectifier circuit (255) can gradually decrease. For example, the low side may mean the portion below the plurality of transistors (Q1, Q2, Q3, Q4) illustrated in the drawing. For example, the transistors arranged on the low side may represent Q2 and Q3. For example, the high side may refer to the portion below the plurality of transistors (Q1, Q2, Q3, Q4) illustrated in the drawing. For example, the transistors arranged on the high side may represent Q1 and Q4.

[0041] According to one embodiment, the control circuit (250) may control the gate driver (257) to provide control signals (Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV) for generating the above-described AC power to the plurality of transistors (Q1, Q2, Q3, Q4). For example, the gate driver (257) may provide control signals (Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV) to the plurality of transistors (Q1, Q2, Q3, Q4) according to the control of the control circuit (250). Here, not only outputting the control signal, but also refraining from outputting the control signal (e.g., stopping the output or suppressing the output) may be referred to as control of the control circuit (250).

[0042] According to one embodiment, the plurality of transistors (Q1, Q2, Q3, Q4) may be implemented as a switch circuit. For example, each of the plurality of transistors (Q1, Q2, Q3, Q4) may be turned on / off under the control of the control circuit (255), and may be implemented as a switch circuit (e.g., a full bridge circuit or a voltage doubler) that may perform a specific function accordingly. Meanwhile, the number and types of transistors illustrated in FIG. 2 are merely examples, and embodiments of the present invention may not be limited thereto.

[0043] 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).

[0044] 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).

[0045] According to one embodiment, the control circuit (250) can adjust the connection state of the plurality of coils (221, 222) and the plurality of capacitors (223, 224) included in the power receiving circuit (220) through the plurality of switches (S1, S2, S3) included in the power receiving circuit (220). Depending on the implementation, the control circuit (250) can adjust the connection state of the second coil (222) included in the power receiving circuit (220) and the plurality of capacitors (223, 224) included in the power receiving circuit (220) through at least one switch (S1 and / or S2) included in the power receiving circuit (220). For example, the control circuit (250) can control the on / off of the plurality of switches (S1, S2, S3) through the switch controller (259). For example, the switch controller (259) can provide control signals (S1_CS, S2_CS, S3_CS) to the plurality of switches (S1, S2, S3) under the control of the control circuit (250). Depending on the implementation, the control circuit (250) can also control the on / off of the plurality of switches (S1, S2, S3) without the switch controller (259). Here, not only outputting the control signal, but also refraining from outputting the control signal can be referred to as control of the control circuit (250).

[0046] According to one embodiment, each of the plurality of switches (S1, S2, S3) can be turned on / off under the control of the control circuit (250) (or the switch controller (259)). Accordingly, the equivalent capacitance value by the plurality of capacitors (223, 224) can be changed. In addition, the coupling value by the plurality of coils (221 and 222) can be changed.

[0047] According to one embodiment, the control circuit (250) can control the switch (S1) to reduce the power received by the plurality of capacitors (223, 224). In one embodiment, the switch (S3) can be controlled to reduce the power received by the plurality of coils (221, 222). The control circuit (250) can control at least one switch to increase the impedance or reduce the coupling value, thereby reducing the power received wirelessly. The control circuit (250) can control the rectifier circuit (255) to free-wheel the power received from the wireless power transmitter (101).

[0048] According to one embodiment, if the control circuit (250) determines that the first voltage (VRECT) of the power rectified through the rectifier circuit (255) is greater than a first threshold value specified in advance, the control circuit (250) may adjust the connection state of the plurality of capacitors (223, 224) through the plurality of switches (S1, S2) so that the impedance by the plurality of capacitors (223, 224) increases. In addition, if the control circuit (250) determines that the first voltage (VRECT) of the power rectified through the rectifier circuit (255) is greater than a first threshold value specified in advance, the control circuit (250) may adjust the connection state of the plurality of coils (221, 222) through the third switch (S3) so that the coupling by the plurality of coils (221, 222) is reduced. For example, the first threshold value may be determined based on a threshold voltage allowed for the wireless power receiving device (103). For example, if the threshold voltage allowed for the wireless power receiving device (103) is 20 V, the first threshold value can be determined as 18 to 20 V.

[0049] According to one embodiment, the control circuit (250) can control at least one switch (S1, S2, or S3) to increase the impedance by the plurality of capacitors (223, 224). The control circuit (250) can free-wheel the power received from the wireless power transmission device (101) based on the control of at least one switch (S1, S2, or S3).

[0050] According to one embodiment, the control circuit (250) may control the plurality of switches (S1, S2, S3) so that the impedance by the plurality of capacitors (223, 224) increases or the coupling by the plurality of coils (221, 222) decreases, and then free-wheels the power received from the wireless power transmission device (101). Alternatively, the control circuit (250) may control the plurality of switches (S1, S2, S3) so that the impedance by the plurality of capacitors (223, 224) increases or the coupling by the plurality of coils (221, 222) decreases, after free-wheeling the power received from the wireless power transmission device (101).

[0051] According to one embodiment, if the control circuit (250) determines that the first voltage (VRECT) of the power rectified through the rectifier circuit (255) after free-wheeling the power received from the wireless power transmitter (101) is less than a pre-specified second threshold value (e.g., a threshold value less than the first threshold value), the control circuit (250) may control the plurality of switches (S1, S2) to change the connection state of the plurality of capacitors (223, 224) and the plurality of coils (221, 222) to the existing connection state. For example, the second threshold value may be determined based on the threshold voltage allowed for the wireless power receiver (103) and the first threshold value. For example, when the threshold voltage allowed for the wireless power receiver (103) is 20 V and the first threshold value is 18 V, the second threshold value may be determined to be 15 V to 16 V.

[0052] Meanwhile, the number, types, and arrangement of the switches (S1, S2, S3) illustrated in FIG. 2 are merely examples, and embodiments of the present invention may not be limited thereto. In addition, the number, types, and arrangement of the capacitors (223, 224) and coils (221, 222) illustrated in FIG. 2 are merely examples, and embodiments of the present invention may not be limited thereto.

[0053] FIG. 3 is a graph illustrating a method for a wireless power receiving device according to one embodiment to freewheel power received from a wireless power transmitting device.

[0054] Referring to FIG. 3, according to one embodiment, a wireless power receiving device (103) (hereinafter, a first electronic device) may receive power from a wireless power transmitting device (101) (hereinafter, a second electronic device). For example, a graph (310) of FIG. 3 may represent a voltage of power received by the first electronic device (103). For example, the first electronic device (103) may output power having a first voltage value (V1) through a rectifier circuit (255) based on the power received from the wireless power transmitting device (101).

[0055] According to one embodiment, the first electronic device (103) may receive a higher level of power than before at a first time point (t1), as shown in the graph (310). For example, when the second electronic device (101) malfunctions, the first electronic device (103) may receive a higher level of power than before. For example, when the distance between the first electronic device (103) and the second electronic device (101) suddenly becomes closer, the first electronic device (103) may receive a higher level of power than before. Alternatively, when the first electronic device (103) is a rollable electronic device or a foldable electronic device, the first electronic device (103) may receive a higher level of power than before when the state of the first electronic device (103) suddenly changes (e.g., changes from a folded state to an unfolded state or changes from an unfolded state to a folded state). For example, the first electronic device (103) can output power having a second voltage value (V2) higher than the first voltage value (V1) through the rectifier circuit (255). It may take a certain amount of time for the first electronic device (103) to transmit a control signal to the second electronic device (101) so that the second electronic device (101) reduces the amount of power transmitted to a normal amount. At this time, if the second voltage value (V2) is higher than the threshold voltage allowed for the first electronic device (103), the first electronic device (103) may be damaged. That is, it may take a certain amount of time for the first electronic device (103) to reduce the amount of power received to below the threshold voltage, and there is a possibility that components included in the first electronic device (103) may be damaged while reducing the amount of power. Therefore, before the second electronic device (101) reduces the amount of power transmitted, the first electronic device (103) may initiate a freewheeling operation to internally consume a high amount of power. When the freewheeling operation is performed, the rectification operation of the rectifier circuit (255) may be interrupted. Accordingly, as shown in the graph (310), the voltage applied to the regulator (242) may gradually decrease.

[0056] However, while the first electronic device (103) performs a free-wheeling operation, a high current may flow through the transistors (Q2, Q3) included in the rectifier circuit. Therefore, there is a possibility that the transistors may be damaged due to the high current. If transistors capable of flowing a high current are mounted, the production cost of the first electronic device (103) may increase and the space utilization may decrease.

[0057] In one embodiment, the first electronic device (103) can control the switches (S1, S2, and / or S3) to increase impedance or decrease coupling value to reduce the received power when the second voltage value (V2) is higher than a first threshold value specified. In one embodiment, the first electronic device (103) can initiate a free-wheeling operation to internally consume power when the second voltage value (V2) is higher than a first threshold value specified. The first electronic device (103) can control the plurality of transistors (Q1, Q2, Q3, Q4) included in the switch and / or rectifier circuit (255) of the power receiving circuit (220) based on a first threshold value that is a criterion below an allowed threshold voltage to prevent and / or reduce damage.

[0058] Through the above-described method, the first electronic device (103) according to one embodiment can prevent and / or reduce damage to the corresponding transistors while performing a free-wheeling operation. Furthermore, the first electronic device (103) according to one embodiment can reduce the amount of power received even without mounting transistors capable of conducting a high amount of current. Through this, the first electronic device (103) can increase efficiency in terms of production cost and space utilization.

[0059] FIG. 4 is a diagram illustrating a method for a wireless power receiving device according to an embodiment to freewheel power received from a wireless power transmitting device. FIG. 5 is a graph showing the current flowing through a corresponding transistor while a wireless power receiving device according to a comparative embodiment performs freewheeling.

[0060] Referring to FIG. 4, the first electronic device (103) can perform a free-wheeling operation so as to consume power received from the second electronic device (101). The first electronic device (103) can control the on / off states of a plurality of transistors (Q1, Q2, Q3, Q4) included in the rectifier circuit (255) to perform the free-wheeling operation. For example, the transistors (Q2, Q3) arranged on the low side can be controlled to be in an on state. Accordingly, the transistors (Q2, Q3) arranged on the low side can be short-circuited to the ground. The transistors (Q1, Q4) arranged on the high side can be controlled to be in an off state. While free-wheeling the power, the rectification operation of the rectifier circuit (255) can be stopped. The rectifier circuit (255) may not output rectified power while free-wheeling is performed. Additionally, while the first electronic device (103) freewheels the power received from the second electronic device (101), the power may be consumed internally in the first electronic device (103).

[0061] Referring to FIG. 5, according to a comparative example, while free-wheeling the power received from the second electronic device (101), a current (510) corresponding to the power may be conducted to the transistors (Q2, Q3) disposed on the low side. For example, a current value corresponding to a peak of the current (510) may exceed a current value allowed for the transistors (Q2, Q3) disposed on the low side. For example, the current value corresponding to the peak of the current (510) may exceed 15 A. As a result, the transistors (Q2, Q3) through which the current is conducted may be damaged while free-wheeling. Therefore, while free-wheeling the power received from the second electronic device (101), the magnitude of the conducted current must be reduced to prevent and / or reduce damage to the corresponding transistors (Q2, Q3).

[0062] According to one embodiment, the first electronic device (103) can change the connection state of a plurality of capacitors (223, 224) and a plurality of coils (221, 222) included in the power receiving circuit (220) to reduce the amount of current flowing through the corresponding transistors (Q2, Q3) before performing free-wheeling (or immediately after performing free-wheeling).

[0063] According to one embodiment, the first electronic device (103) can increase the impedance by the plurality of capacitors (223, 224) by controlling the on / off of the plurality of switches (S1, S2, S3) included in the power receiving circuit (220). Through this, the magnitude of the current flowing through the corresponding transistors (Q2, Q3) while performing free-wheeling can be reduced.

[0064] According to one embodiment, the first electronic device (103) can control the on / off of a plurality of switches (S1, S2, S3) included in a power receiving circuit (220) to reduce coupling by a plurality of coils (221, 222). Through this, the amount of current flowing through the corresponding transistors (Q2, Q3) while performing free-wheeling can be reduced.

[0065] FIG. 6 is a flowchart illustrating an operation method of a first electronic device that wirelessly receives power according to one embodiment.

[0066] Referring to FIG. 6, according to one embodiment, in operation 601, a first electronic device (e.g., a wireless power receiving device (103) of FIG. 2) may set a plurality of capacitors (e.g., a plurality of capacitors (223, 224) of FIG. 2) and a plurality of coils (e.g., a plurality of coils (221, 222) of FIG. 2) included in a power receiving circuit (e.g., a power receiving circuit (220) of FIG. 2)) to a first connection state based on a frequency specified by a second electronic device (e.g., a wireless power transmitting device (101) of FIG. 2) that wirelessly transmits power. For example, the first connection state may correspond to a resonance point of the specified frequency.

[0067] According to one embodiment, in operation 603, the first electronic device (103) can wirelessly receive power from the second electronic device (101) through the power receiving circuit (220) set to the first connection state.

[0068] According to one embodiment, in operation 605, the first electronic device (103) may check a first voltage of power rectified through a rectifier (e.g., the rectifier circuit (255) of FIG. 2). For example, the control circuit (250) may check the first voltage (VRECT) of power output from the rectifier circuit (255). In operation 607, the first electronic device (103) may check whether the first voltage is greater than a first threshold value. For example, the first threshold value may be determined based on a maximum rectified voltage allowed by the first electronic device (103). For example, the first threshold value may represent a voltage value that is equal to or slightly lower than the maximum rectified voltage allowed by the first electronic device (103).

[0069] According to one embodiment, if the first voltage is determined to be less than or equal to the first threshold (NO of operation 607), the first electronic device (103) may periodically or continuously check the first voltage of the rectified power through a rectifier (e.g., the rectifier circuit (255) of FIG. 2).

[0070] According to one embodiment, if the first voltage is determined to be greater than the first threshold value (e.g., in operation 607), in operation 609, the first electronic device (103) may set the plurality of capacitors (223, 224) and the plurality of coils (221, 222) to a second connection state via the plurality of switches (S1, S2, S3) such that the impedance by the plurality of capacitors (223, 224) is increased or the coupling by the plurality of coils (221, 222) is decreased. For example, the second connection state may be different from the first connection state.

[0071] According to one embodiment, in operation 611, the first electronic device (103) may control a plurality of transistors (Q1, Q2, Q3, Q4) included in the rectifier (255) to free-wheel power received from the second electronic device (101). At this time, the rectifying operation of the rectifier (255) may be stopped.

[0072] In other embodiments, the order of operations 609 and 611 may be changed. For example, operation 611 may be performed after operation 607. Operation 609 may be performed after operation 611. Depending on the implementation, operations 609 and 611 may be performed simultaneously.

[0073] According to one embodiment, in operation 613, the first electronic device (103) may determine whether the first voltage is less than the second threshold value while performing free-wheeling. For example, the magnitude of the first voltage of the power output from the rectifier circuit (255) may gradually decrease as the free-wheeling is performed. The first electronic device (103) may determine whether the decreased first voltage is less than the second threshold value. The second threshold value may represent a voltage value for determining how long the free-wheeling operation will be performed. For example, the second threshold value may be lower than the first threshold value.

[0074] According to one embodiment, if the first voltage is determined to be greater than or equal to the second threshold (NO of operation 613), the first electronic device (103) may control a plurality of transistors (Q1, Q2, Q3, Q4) included in the rectifier (255) to free-wheel power received from the second electronic device (101).

[0075] According to one embodiment, if the first voltage is determined to be less than the second threshold value (example of operation 613), in operation 615, the first electronic device (103) may control a plurality of transistors (Q1, Q2, Q4, Q4) included in the rectifier (255) to rectify power received from the second electronic device (101). At this time, the free-wheeling operation may be terminated.

[0076] According to one embodiment, in operation 617, the first electronic device (103) can change the connection state of the plurality of capacitors (223, 224) and the plurality of coils (221, 222) from the second connection state to the existing first connection state. Thereafter, the first electronic device (103) can wirelessly receive power from the second electronic device (101) through the power receiving circuit (220) set to the first connection state.

[0077] Depending on the implementation, the order of the operations described in FIG. 6 may be changed, or two or more operations may be performed in parallel. In another embodiment, the order of operations 615 and 617 may be changed. For example, operation 617 may be performed after operation 613. Operation 615 may be performed after operation 617. Depending on the implementation, operations 615 and 617 may be performed simultaneously.

[0078] Through the above-described method, the first electronic device (103) can reduce the amount of current flowing through the corresponding transistors (Q2, Q3) while performing a free-wheeling operation. In addition, the first electronic device (103) can prevent and / or reduce damage to the first electronic device (103) when the power received from the second electronic device (101) suddenly increases.

[0079] FIG. 7 is a graph showing a change in impedance according to an equivalent capacitance of a first electronic device according to one embodiment.

[0080] Referring to FIG. 7, the graph (710) may represent the impedance size of the first electronic device (103) according to the equivalent capacitance of the first electronic device (103) when the first electronic device (103) and the second electronic device (101) are in a specific state (e.g., the size of the impedance in the equivalent circuit of the first electronic device (103) of FIG. 2). For example, when the equivalent capacitance of the first electronic device (103) is less than 400 nF, the size of the impedance may be inversely proportional to the equivalent capacitance. For example, when the equivalent capacitance is 400 nF, the first electronic device (103) may control the on / off of the first switch (S1) and / or the second switch (S2) to change the equivalent capacitance of the first electronic device (103). For example, if the first switch (S1) is opened and the equivalent capacitance of the first electronic device (103) changes from 500 nF to 200 nF, the impedance of the first electronic device (103) may increase. Alternatively, if the second switch (S2) is shorted and the equivalent capacitance of the first electronic device (103) changes from 500 nF to 0 nF (or approaches the 0 nF value), the impedance of the first electronic device (103) may increase further. If the impedance of the first electronic device (103) increases, the magnitude of the current flowing through the transistors (Q2, Q3) due to free-wheeling may decrease.

[0081] According to the above-described method, the first electronic device (201) can change the connection state of the plurality of capacitances (223, 224) included in the power receiving circuit (220) so as to increase the impedance. Meanwhile, increasing the impedance size by opening the first switch (S1) or short-circuiting the second switch (S2) described above is just one example, and the method of changing the connection state of the switches to increase the impedance size may not be limited thereto. Depending on the implementation, the first electronic device (103) may also increase the impedance size of the first electronic device (103) by short-circuiting the opened first switch (S1) or opening the short-circuited second switch (S2).

[0082] FIGS. 8A and 8B are diagrams showing currents flowing through corresponding transistors while the first electronic device performs free-wheeling, according to one embodiment.

[0083] Referring to FIGS. 8A and 8B, according to one embodiment, the first electronic device (103) can increase the impedance of the first electronic device (103) by controlling the on / off of the first switch (S1) and / or the second switch (S2). Through this, the first electronic device (103) can reduce the amount of current flowing through the transistors (Q2, Q3) when performing a free-wheeling operation.

[0084] Referring to FIG. 8A, according to one embodiment, the first electronic device (103) can reduce the equivalent capacitance of the first electronic device (103) from 500 nF to 200 nF by opening the first switch (S1) included in the power receiving circuit (220). Compared to the peak of the current (510) of FIG. 5, the peak of the current (810) conducted to the transistors (Q2, Q3) during free-wheeling can be reduced to about 6 A.

[0085] Referring to FIG. 8B, according to one embodiment, the first electronic device (103) can reduce the equivalent capacitance of the first electronic device (103) from 500 nF to 0 nF by short-circuiting the second switch (S2) included in the power receiving circuit (220). Compared to the peak of the current (510) of FIG. 5, the peak of the current (820) flowing through the transistors (Q2, Q3) during free-wheeling can be reduced to about 2 A.

[0086] According to the above-described method, the first electronic device (201) can prevent and / or reduce damage to the transistors (Q2, Q3) during free-wheeling by changing the connection state of a plurality of capacitors (223, 224) included in the power receiving circuit (220).

[0087] FIG. 9 is a flowchart illustrating a method for a first electronic device according to one embodiment to increase impedance and thereby reduce the amount of current flowing through transistors during free-wheeling.

[0088] Referring to FIG. 9, according to one embodiment, in operation 901, the first electronic device (103) may control the first switch (S1) included in the power receiving circuit (220) to be turned on, the second switch (S2) to be turned off, and the third switch (S3) to be turned on in a first connection state for the plurality of capacitors (223, 224) and the plurality of coils (221, 222) included in the power receiving circuit (220). For example, the first connection state may correspond to a resonance point of a first frequency (e.g., 360 kHz) specified by the second electronic device (101).

[0089] According to one embodiment, in operation 903, the first electronic device (103) can wirelessly receive power from the second electronic device (101) through the power receiving circuit (220) set to the first connection state.

[0090] In one embodiment, in operation 905, it can be determined whether the first voltage (VRECT) applied to the regulator (242) is greater than the first threshold value.

[0091] According to one embodiment, if it is determined that the first voltage (VRECT) applied to the regulator (242) is less than or equal to the first threshold value (NO of operation 905), the first electronic device (103) may wirelessly receive power from the second electronic device (101) through the power receiving circuit (220) set to the first connection state, and periodically or in real time determine whether the first voltage (VRECT) applied to the regulator (242) is greater than the first threshold value.

[0092] According to one embodiment, if it is determined that the first voltage (VRECT) applied to the regulator (242) is greater than the first threshold value (example of operation 905), in operation 907, the first electronic device (103) may turn off the first switch to change the first connection state for the plurality of capacitors (223, 224) and the plurality of coils (221, 222) included in the power receiving circuit (220) to the second connection state. That is, the first electronic device (103) may control the first switch (S1) to the off state in the second connection state. Based on the turning off of the first switch (S1), the equivalent capacitance of the power receiving circuit (220) may decrease. As the equivalent capacitance of the power receiving circuit (220) decreases, the impedance of the power receiving circuit (220) may increase. Meanwhile, controlling the first switch (S1) described above to be turned off so that the resonant frequency of the first electronic device (103) deviates further from the resonant point of the first frequency is merely an example, and the method of changing the connection state of the switch so that the resonant frequency of the first electronic device (103) deviates further from the resonant point of the first frequency may not be limited thereto. Depending on the implementation, the first electronic device (103) may also change the resonant frequency of the first electronic device (103) by controlling the first switch (S1) in the off state to the on state.

[0093] According to one embodiment, in operation 909, the first electronic device (103) may perform a free-wheeling operation by turning off the transistors (Q1, Q4) disposed on the high side and turning on the transistors (Q2, Q3) disposed on the low side among the plurality of transistors (Q1, Q2, Q3, Q4) included in the rectifier circuit (255). As the free-wheeling operation is performed, the first electronic device (103) may consume power received from the second electronic device (101). At this time, as the impedance of the first electronic device (103) increases, a current having a magnitude lower than the allowable current may be conducted to the transistors (Q2, Q3) disposed on the low side.

[0094] According to one embodiment, in operation 911, the first electronic device (103) may determine whether the first voltage (VRECT) applied to the regulator (242) after the free-wheeling operation is performed is less than the second threshold value. For example, the first electronic device (103) may determine periodically or in real time whether the first voltage (VRECT) applied to the regulator (242) is less than the second threshold value after the free-wheeling operation is performed.

[0095] According to one embodiment, if it is determined that the first voltage (VRECT) is less than the second threshold value (example of operation 911), in operation 913, the first electronic device (103) may perform a rectification operation on power received from the second electronic device (101) by controlling on / off of a plurality of transistors (Q1, Q2, Q3, Q4). For example, the first electronic device (103) may turn on the first transistor (Q1) and the third transistor (Q3) and turn off the second transistor (Q2) and the fourth transistor (Q4) in a first section. The first electronic device (103) may turn off the first transistor (Q1) and the third transistor (Q3) and turn on the second transistor (Q2) and the fourth transistor (Q4) in a second section following the first section. By alternately repeating the above operation, the first electronic device (103) can rectify the power received from the second electronic device (101).

[0096] According to one embodiment, in operation 915, the first electronic device (103) may turn on the first switch (S1) to reset (or change) the plurality of capacitors (223, 224) and the plurality of coils (221, 222) to the existing first connection state. For example, the first electronic device (103) may control the first switch (S1) to the on state again. Thereafter, the first electronic device (103) may wirelessly receive power from the second electronic device (101) through the power receiving circuit (220) set to the first connection state.

[0097] Depending on the implementation, the order of the operations described in FIG. 9 may change, or two or more operations may be performed in parallel.

[0098] FIG. 10 is a flowchart illustrating a method for a first electronic device according to one embodiment to increase impedance and thereby reduce the amount of current flowing through transistors during free-wheeling.

[0099] Referring to FIG. 10, according to one embodiment, in operation 1001, the first electronic device (103) may control the first switch (S1) included in the power receiving circuit (220) to be turned off, the second switch (S2) to be turned off, and the third switch (S3) to be turned on in a first connection state for the plurality of capacitors (223, 224) and the plurality of coils (221, 222) included in the power receiving circuit (220). For example, the first connection state may correspond to a resonance point of a second frequency (e.g., 127 kHz) specified by the second electronic device (101).

[0100] According to one embodiment, in operation 1003, the first electronic device (103) can wirelessly receive power from the second electronic device (101) through the power receiving circuit (220) set to the first connection state.

[0101] In one embodiment, in operation 1005, it can be determined whether the first voltage (VRECT) applied to the regulator (242) is greater than the first threshold value.

[0102] According to one embodiment, if it is determined that the first voltage (VRECT) applied to the regulator (242) is less than or equal to the first threshold value (NO of operation 1005), power may be wirelessly received from the second electronic device (101) through the power receiving circuit (220) set to the first connection state, and it may be determined periodically or in real time whether the first voltage (VRECT) applied to the regulator (242) is greater than the first threshold value.

[0103] According to one embodiment, if it is determined that the first voltage (VRECT) applied to the regulator (242) is greater than the first threshold value (example of operation 1005), in operation 1007, the first electronic device (103) may turn on the second switch (S2) to change the first connection state for the plurality of capacitors (223, 224) and the plurality of coils (221, 222) included in the power receiving circuit (220) to the second connection state. That is, the first electronic device (103) may control the second switch (S2) to the on state in the second connection state. Based on the turning on of the second switch (S2), the equivalent capacitance of the power receiving circuit (220) may decrease (e.g., 0 nF). As the equivalent capacitance of the power receiving circuit (220) decreases, the impedance of the power receiving circuit (220) may increase significantly.

[0104] According to one embodiment, in operation 1009, the first electronic device (103) may perform a free-wheeling operation by turning off the transistors (Q1, Q4) disposed on the high side and turning on the transistors (Q2, Q3) disposed on the low side among the plurality of transistors (Q1, Q2, Q3, Q4) included in the rectifier circuit (255). As the free-wheeling operation is performed, the first electronic device (103) may consume power received from the second electronic device (101). At this time, as the impedance of the first electronic device (103) is greatly increased, a current having a magnitude lower than the allowable current may be conducted to the transistors (Q2, Q3) disposed on the low side.

[0105] According to one embodiment, in operation 1011, the first electronic device (103) can check whether the first voltage (VRECT) applied to the regulator (242) is less than the second threshold value after the free-wheeling operation is performed. For example, the first electronic device (103) can check periodically or in real time whether the first voltage (VRECT) applied to the regulator (242) is less than the second threshold value after the free-wheeling operation is performed.

[0106] According to one embodiment, if it is determined that the first voltage (VRECT) is less than the second threshold value (example of operation 1011), in operation 1013, the first electronic device (103) may perform a rectification operation on power received from the second electronic device (101) by controlling the on / off of a plurality of transistors (Q1, Q2, Q3, Q4).

[0107] According to one embodiment, in operation 1015, the first electronic device (103) may turn off the second switch (S2) to reset (or change) the plurality of capacitors (223, 224) and the plurality of coils (221, 222) to the existing first connection state. For example, the first electronic device (103) may control the second switch (S2) to the off state again. Thereafter, the first electronic device (103) may wirelessly receive power from the second electronic device (101) through the power receiving circuit (220) set to the first connection state.

[0108] Depending on the implementation, the order of the operations described in FIG. 10 may change, or two or more operations may be performed in parallel.

[0109] FIG. 11 is a flowchart illustrating a method for reducing the coupling of a coil by a first electronic device according to one embodiment to reduce the amount of current flowing through transistors during free-wheeling.

[0110] Referring to FIG. 11, according to one embodiment, in operation 1001, the first electronic device (103) may control the first switch (S1) included in the power receiving circuit (220) to be turned off, the second switch (S2) to be turned off, and the third switch (S3) to be turned on in a first connection state for the plurality of capacitors (223, 224) and the plurality of coils (221, 222) included in the power receiving circuit (220). For example, the first connection state may correspond to a resonance point of a second frequency (e.g., 127 kHz) specified by the second electronic device (101).

[0111] According to one embodiment, in operation 1103, the first electronic device (103) can wirelessly receive power from the second electronic device (101) through the power receiving circuit (220) set to the first connection state.

[0112] In one embodiment, in operation 1105, it can be determined whether the first voltage (VRECT) applied to the regulator (242) is greater than the first threshold value.

[0113] According to one embodiment, if it is determined that the first voltage (VRECT) applied to the regulator (242) is less than or equal to the first threshold value (NO of operation 1105), the first electronic device (103) may wirelessly receive power from the second electronic device (101) through the power receiving circuit (220) set to the first connection state, and periodically or in real time determine whether the first voltage (VRECT) applied to the regulator (242) is greater than the first threshold value.

[0114] According to one embodiment, if it is determined that the first voltage (VRECT) applied to the regulator (242) is greater than the first threshold value (example of operation 1105), in operation 1107, the first electronic device (103) may turn off the third switch (S3) to change the first connection state for the plurality of capacitors (223, 224) and the plurality of coils (221, 222) included in the power receiving circuit (220) to the second connection state. That is, the first electronic device (103) may control the third switch (S3) to the off state in the second connection state. Based on the turning off of the third switch (S3), the coupling by the first coil (221) may be reduced. The first electronic device (103) can reduce the voltage induced in the first coil (221) by electromagnetic induction as the coupling by the first coil (221) of the power receiving circuit (220) decreases.

[0115] According to one embodiment, in operation 1109, the first electronic device (103) may perform a free-wheeling operation by turning off the transistors (Q1, Q4) disposed on the high side and turning on the transistors (Q2, Q3) disposed on the low side among the plurality of transistors (Q1, Q2, Q3, Q4) included in the rectifier circuit (255). As the free-wheeling operation is performed, the first electronic device (103) may consume power received from the second electronic device (101). At this time, as the voltage induced by the first coil (221) decreases, a current having a magnitude lower than the allowable current may be conducted to the transistors (Q2, Q3) disposed on the low side.

[0116] According to one embodiment, in operation 1111, the first electronic device (103) may determine whether the first voltage (VRECT) applied to the regulator (242) is less than the second threshold value after the free-wheeling operation is performed. For example, the first electronic device (103) may determine periodically or in real time whether the first voltage (VRECT) applied to the regulator (242) is less than the second threshold value after the free-wheeling operation is performed.

[0117] According to one embodiment, if it is determined that the first voltage (VRECT) is less than the second threshold value (example of operation 1111), in operation 1113, the first electronic device (103) may perform a rectification operation on power received from the second electronic device (101) by controlling the on / off of a plurality of transistors (Q1, Q2, Q3, Q4).

[0118] According to one embodiment, in operation 1115, the first electronic device (103) may turn on the third switch (S3) to reset (or change) the plurality of capacitors (223, 224) and the plurality of coils (221, 222) to the existing first connection state. For example, the first electronic device (103) may control the third switch (S3) to turn on again. Thereafter, the first electronic device (103) may wirelessly receive power from the second electronic device (101) through the power receiving circuit (220) set to the first connection state.

[0119] Depending on the implementation, the order of the operations described in FIG. 11 may change, or two or more operations may be performed in parallel.

[0120] The connection state of the plurality of capacitors (223, 224) and the plurality of coils (221, 222) described in the above-described FIGS. 9 to 11 is merely an example, and the present invention may not be limited thereto. For example, due to the characteristics of electromagnetic induction, the impedance value by the capacitance value may vary depending on the operating frequency of the second electronic device (101), the coil structure of the first electronic device (103) and the second electronic device (101), and the coupling state between the first electronic device (103) and the second electronic device (101). For example, the on / off control of the plurality of switches (S1, S2, S3) included in the power receiving circuit (220) may be performed differently from the above. For example, in the graph (710) of FIG. 7, when the resonance point is set to the right of 400 nF, the impedance size may increase as the equivalent capacitance increases. At this time, the first electronic device (103) can control the on / off of the first switch (S1) and the second switch (S2) differently from that described in FIGS. 9 to 11 in order to increase the impedance of the power receiving circuit (220).

[0121] The first electronic device (103) according to one embodiment may be implemented identically or similarly to the electronic device (1201) described below.

[0122] FIG. 12 is a block diagram of an electronic device (1201) within a network environment (1200) according to various embodiments. Referring to FIG. 12, in the network environment (1200), an electronic device (1201) (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 (1202) via a first network (1298) (e.g., a short-range wireless communication network), or may communicate with at least one of an electronic device (1204) or a server (1208) via a second network (1299) (e.g., a long-range wireless communication network). In one embodiment, the electronic device (1201) may communicate with the electronic device (1204) via the server (1208). According to one embodiment, the electronic device (1201) may include a processor (1220), a memory (1230), an input module (1250), an audio output module (1255), a display module (1260), an audio module (1270), a sensor module (1276), an interface (1277), a connection terminal (1278), a haptic module (1279), a camera module (1280), a power management module (1288), a battery (1289), a communication module (1290), a subscriber identification module (1296), or an antenna module (1297). In some embodiments, the electronic device (1201) may omit at least one of these components (e.g., the connection terminal (1278)), or may have one or more other components added. In some embodiments, some of these components (e.g., sensor module (1276), camera module (1280), or antenna module (1297)) may be integrated into a single component (e.g., display module (1260)).

[0123] The processor (1220) may control at least one other component (e.g., hardware or software component) of the electronic device (1201) connected to the processor (1220) by executing, for example, software (e.g., program (1240)), and may perform various data processing or operations. According to one embodiment, as at least a part of the data processing or operations, the processor (1220) may store commands or data received from other components (e.g., sensor module (1276) or communication module (1290)) in volatile memory (1232), process the commands or data stored in volatile memory (1232), and store result data in non-volatile memory (1234). According to one embodiment, the processor (1220) may include a main processor (1221) (e.g., a central processing unit or an application processor) or an auxiliary processor (1223) (e.g., a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor) that can operate independently or together with the main processor (1221). For example, when the electronic device (1201) includes the main processor (1221) and the auxiliary processor (1223), the auxiliary processor (1223) may be configured to use less power than the main processor (1221) or to be specialized for a given function. The auxiliary processor (1223) may be implemented separately from the main processor (1221) or as a part thereof.

[0124] The auxiliary processor (1223) may control at least a portion of functions or states associated with at least one component (e.g., a display module (1260), a sensor module (1276), or a communication module (1290)) of the electronic device (1201), for example, on behalf of the main processor (1221) while the main processor (1221) is in an inactive (e.g., sleep) state, or together with the main processor (1221) while the main processor (1221) is in an active (e.g., application execution) state. In one embodiment, the auxiliary processor (1223) (e.g., an image signal processor or a communication processor) may be implemented as a part of another functionally related component (e.g., a camera module (1280) or a communication module (1290)). In one embodiment, the auxiliary processor (1223) (e.g., a neural network processing unit) may include a hardware structure specialized for processing artificial intelligence models. The artificial intelligence models may be generated through machine learning. This learning can be performed, for example, on the electronic device (1201) itself where the artificial intelligence model is executed, or can be performed through a separate server (e.g., server (1208)). The learning algorithm can include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but is not limited to the examples described above. The artificial intelligence model can include multiple artificial neural network layers.The artificial neural network may be one of a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), a deep Q-network, or a combination of two or more of the above, but is not limited to the examples described above. In addition to, or alternatively to, a hardware structure, an artificial intelligence model may include a software structure.

[0125] The memory (1230) can store various data used by at least one component (e.g., the processor (1220) or the sensor module (1276)) of the electronic device (1201). The data can include, for example, software (e.g., the program (1240)) and input data or output data for commands related thereto. The memory (1230) can include a volatile memory (1232) or a non-volatile memory (1234).

[0126] The program (1240) may be stored as software in memory (1230) and may include, for example, an operating system (1242), middleware (1244), or an application (1246).

[0127] The input module (1250) can receive commands or data to be used in a component of the electronic device (1201) (e.g., a processor (1220)) from an external source (e.g., a user) of the electronic device (1201). The input module (1250) can include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0128] The audio output module (1255) can output audio signals to the outside of the electronic device (1201). The audio output module (1255) can include, for example, a speaker or a receiver. The speaker can be used for general purposes, such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. In one embodiment, the receiver can be implemented separately from the speaker or as part of the speaker.

[0129] The display module (1260) can visually provide information to an external party (e.g., a user) of the electronic device (1201). The display module (1260) may include, for example, a display, a holographic device, or a projector, and a control circuit for controlling the device. In one embodiment, the display module (1260) may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of a force generated by the touch.

[0130] The audio module (1270) can convert sound into an electrical signal, or vice versa, convert an electrical signal into sound. According to one embodiment, the audio module (1270) can acquire sound through the input module (1250), output sound through the sound output module (1255), or an external electronic device (e.g., electronic device (1202)) (e.g., speaker or headphone) directly or wirelessly connected to the electronic device (1201).

[0131] The sensor module (1276) can detect the operating status (e.g., power or temperature) of the electronic device (1201) or the external environmental status (e.g., user status) and generate an electrical signal or data value corresponding to the detected status. According to one embodiment, the sensor module (1276) can include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0132] The interface (1277) may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device (1201) with an external electronic device (e.g., the electronic device (1202)). In one embodiment, the interface (1277) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

[0133] The connection terminal (1278) may include a connector through which the electronic device (1201) may be physically connected to an external electronic device (e.g., the electronic device (1202)). In one embodiment, the connection terminal (1278) may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0134] The haptic module (1279) can convert electrical signals into mechanical stimuli (e.g., vibration or movement) or electrical stimuli that a user can perceive through tactile or kinesthetic sensations. In one embodiment, the haptic module (1279) may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

[0135] The camera module (1280) can capture still images and videos. According to one embodiment, the camera module (1280) may include one or more lenses, image sensors, image signal processors, or flashes.

[0136] The power management module (1288) can manage the power supplied to the electronic device (1201). According to one embodiment, the power management module (1288) can be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

[0137] A battery (1289) may power at least one component of the electronic device (1201). In one embodiment, the battery (1289) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0138] The communication module (1290) may support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device (1201) and an external electronic device (e.g., electronic device (1202), electronic device (1204), or server (1208)), and the performance of communication through the established communication channel. The communication module (1290) may operate independently from the processor (1220) (e.g., application processor) and may include one or more communication processors that support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module (1290) may include a wireless communication module (1292) (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (1294) (e.g., a local area network (LAN) communication module, or a power line communication module). Any of these communication modules may communicate with an external electronic device (1204) via a first network (1298) (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (1299) (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules may be integrated into a single component (e.g., a single chip) or implemented as multiple separate components (e.g., multiple chips). The wireless communication module (1292) may use subscriber information (e.g., an international mobile subscriber identity (IMSI)) stored in the subscriber identification module (1296) to verify or authenticate the electronic device (1201) within a communication network such as the first network (1298) or the second network (1299).

[0139] The wireless communication module (1292) can support 5G networks and next-generation communication technologies following the 4G network, such as NR access technology (new radio access technology). The NR access technology can support high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and connection of multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency communications)). The wireless communication module (1292) can support, for example, a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate. The wireless communication module (1292) may support various technologies for securing performance in high-frequency bands, such as beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module (1292) may support various requirements specified in the electronic device (1201), an external electronic device (e.g., the electronic device (1204)), or a network system (e.g., the second network (1299)). According to one embodiment, the wireless communication module (1292) can support a peak data rate (e.g., 20 Gbps or more) for eMBB realization, a loss coverage (e.g., 164 dB or less) for mMTC realization, or a U-plane latency (e.g., 0.5 ms or less for downlink (DL) and uplink (UL), or 1 ms or less for round trip) for URLLC realization.

[0140] The antenna module (1297) can transmit or receive signals or power to or from an external device (e.g., an external electronic device). In one embodiment, the antenna module (1297) may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). In one embodiment, the antenna module (1297) may include a plurality of antennas (e.g., an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network, such as the first network (1298) or the second network (1299), may be selected from the plurality of antennas, for example, by the communication module (1290). A signal or power may be transmitted or received between the communication module (1290) and an external electronic device via the selected at least one antenna. In some embodiments, in addition to the radiator, another component (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as a part of the antenna module (1297).

[0141] According to various embodiments, the antenna module (1297) may form a mmWave antenna module. In one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent a first side (e.g., a bottom side) of the printed circuit board and capable of supporting a designated high frequency band (e.g., a mmWave band), and a plurality of antennas (e.g., an array antenna) disposed on or adjacent a second side (e.g., a top side or a side side) of the printed circuit board and capable of transmitting or receiving signals in the designated high frequency band.

[0142] 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)).

[0143] According to one embodiment, commands or data may be transmitted or received between the electronic device (1201) and an external electronic device (1204) via a server (1208) connected to a second network (1299). Each of the external electronic devices (1202 or 1204) may be the same or a different type of device as the electronic device (1201). According to one embodiment, all or part of the operations executed in the electronic device (1201) may be executed in one or more of the external electronic devices (1202, 1204, or 1208). For example, when the electronic device (1201) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (1201) may, instead of or in addition to executing the function or service itself, request one or more external electronic devices to perform the function or at least a part of the service. One or more external electronic devices that receive the request may execute at least a portion of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device (1201). The electronic device (1201) may process the result as is or additionally and provide it as at least a portion of a response to the request. For this purpose, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device (1201) may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device (1204) may include an Internet of Things (IoT) device. The server (1208) may be an intelligent server utilizing machine learning and / or a neural network.According to one embodiment, an external electronic device (1204) or server (1208) may be included within the second network (1299). The electronic device (1201) may be applied to intelligent services (e.g., smart homes, smart cities, smart cars, or healthcare) based on 5G communication technology and IoT-related technology.

[0144] A first electronic device (103) for wirelessly receiving power according to an embodiment may include a power receiving circuit (220) including a plurality of capacitors (223, 224), at least one coil (221 and / or 222), and at least one switch, a rectifier (255) including a plurality of transistors, and a control circuit (250). The control circuit according to an embodiment may be configured to set the plurality of capacitors and the at least one coil to a first connection state through the at least one switch based on a frequency specified by a second electronic device for wirelessly transmitting power. The control circuit according to an embodiment may be configured to wirelessly receive AC power from the second electronic device through the power receiving circuit set to the first connection state. The control circuit according to an embodiment may be configured to control the plurality of transistors included in the rectifier to rectify the power received from the second electronic device. The control circuit according to one embodiment may be configured to check a first voltage of the power rectified into direct current through the rectifier. The control circuit according to one embodiment may be configured to set the plurality of capacitors and the at least one coil to a second connection state through the at least one switch so that an impedance by the plurality of capacitors increases based on checking that the first voltage is greater than a first threshold value. The control circuit according to one embodiment may be configured to control the plurality of transistors included in the rectifier so as to free-wheel the power received from the second electronic device.

[0145] The control circuit according to one embodiment may be configured to control the plurality of transistors included in the rectifier to rectify the power received from the second electronic device based on determining that the first voltage is less than a second threshold value that is less than the first threshold value. The control circuit according to one embodiment may be configured to change a connection state of the plurality of capacitors and the at least one coil from the second connection state to the first connection state.

[0146] In one embodiment, the control circuit may be configured to change, through the at least one switch, a connection state of the plurality of capacitors and the at least one coil from the second connection state to the first connection state based on determining that the first voltage is less than a second threshold value that is less than the first threshold value. In one embodiment, the control circuit may be configured to control the plurality of transistors included in the rectifier to rectify the power received from the second electronic device.

[0147] The control circuit according to one embodiment may be configured to short-circuit the first transistor and the second transistor, which are arranged on the low side of the plurality of transistors, to ground to free-wheel the power received from the second electronic device.

[0148] In one embodiment, the commutation operation of the rectifier may be interrupted while free-wheeling the power received from the second electronic device.

[0149] According to one embodiment, the power receiving circuit may include a first capacitor (223) and a second capacitor (224) connected in parallel to each other, a first coil (221) and a second coil (222) connected in parallel to each other, a first switch (S1) connected in series to the first capacitor, a second switch (S2) connected in parallel to each of the first capacitor and the second capacitor, and a third switch (S3) disposed between the first coil and the second coil.

[0150] According to one embodiment, the control circuit may be configured to turn on the first switch, turn off the second switch, and turn on the third switch in the first connection state. According to one embodiment, the control circuit may be configured to turn off the first switch in the second connection state so that the equivalent capacitance value of the first electronic device is reduced.

[0151] According to one embodiment, the control circuit may be configured to turn off the first switch, turn off the second switch, and turn on the third switch in the first connection state. According to one embodiment, the control circuit may be configured to turn on the second switch in the second connection state so that the equivalent capacitance value of the first electronic device is reduced.

[0152] In one embodiment, the control circuit may be configured to turn off the first switch, turn off the second switch, and turn on the third switch in the first connection state. In one embodiment, the control circuit may be configured to turn off the third switch in the second connection state so as to reduce coupling to the first coil.

[0153] The control circuit according to one embodiment may be set to determine the first voltage based on the voltage across the regulator (242) connected to the output terminal of the rectifier.

[0154] A method of operating a first electronic device (103) for wirelessly receiving power according to an embodiment may include an operation of wirelessly receiving AC power from a second electronic device (101) through a power receiving circuit (220) included in the first electronic device. A plurality of capacitors (223, 224) and at least one coil (221 and / or 222) included in the power receiving circuit according to an embodiment may be set to a first connection state corresponding to a frequency specified by the second electronic device through at least one switch. A method of operating the first electronic device according to an embodiment may include an operation of controlling a plurality of transistors included in a rectifier (255) included in the electronic device to rectify the power received from the second electronic device. A method of operating the first electronic device according to an embodiment may include an operation of checking a first voltage of the power rectified into DC through the rectifier included in the first electronic device. In one embodiment, the operating method of the first electronic device may include an operation of setting the plurality of capacitors and the at least one coil to a second connection state through the at least one switch so that an impedance by the plurality of capacitors increases based on determining that the first voltage is greater than a first threshold value. In one embodiment, the operating method of the first electronic device may include an operation of controlling the plurality of transistors included in the rectifier so as to free-wheel the power received from the second electronic device.

[0155] The operating method of the first electronic device according to one embodiment may further include an operation of rectifying the power received from the second electronic device by controlling the plurality of transistors included in the rectifier based on determining that the first voltage is less than a second threshold value that is less than the first threshold value. The operating method of the first electronic device according to one embodiment may further include an operation of changing a connection state of the plurality of capacitors and the at least one coil from the second connection state to the first connection state.

[0156] In one embodiment, the operating method of the first electronic device may further include an operation of changing a connection state of the plurality of capacitors and the at least one coil from the second connection state to the first connection state through the at least one switch based on determining that the first voltage is lower than a second threshold value that is lower than the first threshold value. In one embodiment, the operating method of the first electronic device may further include an operation of rectifying the power received from the second electronic device by controlling the plurality of transistors included in the rectifier.

[0157] In one embodiment, the operation of free-wheeling the power received from the second electronic device may include shorting the first transistor and the second transistor disposed on the low-side of the plurality of transistors to ground.

[0158] In one embodiment, the commutation operation of the rectifier may be interrupted while free-wheeling the power received from the second electronic device.

[0159] According to one embodiment, the power receiving circuit may include a first capacitor (223) and a second capacitor (224) connected in parallel with each other, a first coil (221) and a second coil (222) connected in parallel with each other, a first switch (S1) connected in series with the first capacitor, a second switch (S2) connected in parallel with the first capacitor and the second capacitor, and a third switch (S3) disposed between the first coil and the second coil.

[0160] The operating method of the first electronic device according to one embodiment may further include, in the first connected state, an operation of turning on the first switch, turning off the second switch, and turning on the third switch. The operating method of the first electronic device according to one embodiment may further include, in the second connected state, an operation of turning off the first switch so that an equivalent capacitance value of the first electronic device is reduced.

[0161] The operating method of the first electronic device according to one embodiment may further include, in the first connected state, an operation of turning off the first switch, turning off the second switch, and turning on the third switch. The operating method of the first electronic device according to one embodiment may further include, in the second connected state, an operation of turning on the second switch so that an equivalent capacitance value of the first electronic device is reduced.

[0162] The operating method of the first electronic device according to one embodiment may further include, in the first connected state, an operation of turning off the first switch, turning off the second switch, and turning on the third switch. The operating method of the first electronic device according to one embodiment may further include, in the second connected state, an operation of turning off the third switch so as to reduce coupling to the first coil.

[0163] A computer-readable non-transitory recording medium (1230) according to one embodiment comprises: an operation of wirelessly receiving AC power from a second electronic device (101) through a power receiving circuit (220) of a first electronic device (103), wherein a plurality of capacitors (223, 224) and at least one coil (221 and / or 222) included in the power receiving circuit are set to a first connection state corresponding to a frequency specified by the second electronic device through at least one switch, and an operation of controlling a plurality of transistors included in a rectifier (255) included in the electronic device to rectify the power received from the second electronic device, an operation of checking a first voltage of the power rectified into DC through the rectifier included in the first electronic device, an operation of setting the plurality of capacitors and the at least one coil to a second connection state through the at least one switch so that an impedance by the plurality of capacitors increases based on checking that the first voltage is greater than a first threshold value, and an operation of controlling the second electronic device to rectify the power received from the second electronic device. Instructions can be stored that can execute an operation of controlling the plurality of transistors included in the rectifier to free-wheel the power received from the device.

[0164] 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.

[0165] 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.

[0166] 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).

[0167] 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.

[0168] 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.

[0169] 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.

[0170] While the present disclosure has been illustrated and described with reference to various exemplary embodiments, it is to be understood that the various exemplary embodiments are illustrative and not limiting. It will be further understood by those skilled in the art that various changes in form and detail may be made without departing from the true spirit and scope of the present disclosure, including the appended claims and their equivalents. It will also be understood that any embodiment(s) described herein may be used in conjunction with any other embodiment(s) described herein.

Claims

1. In a first electronic device (103) set to receive power wirelessly, A power receiving circuit (220) comprising a plurality of capacitors (223, 224), at least one coil (221, 222), and at least one switch; A rectifier (255) comprising a plurality of transistors; and It includes a control circuit (250), and the control circuit comprises: Based on a frequency specified by a second electronic device (101) that wirelessly transmits power, the plurality of capacitors and the at least one coil are set to a first connection state through the at least one switch, Through the power receiving circuit set to the first connection state, the AC power is wirelessly received from the second electronic device, Controlling the plurality of transistors included in the rectifier to rectify the power received from the second electronic device, Check the first voltage of the power rectified into direct current through the above rectifier, An electronic device configured to set the plurality of capacitors and the at least one coil to a second connection state through the at least one switch so that an impedance by the plurality of capacitors increases and / or a resonant frequency of the power is changed based on determining that the first voltage is greater than a first threshold value, and to control the plurality of transistors included in the rectifier so as to free-wheel the power received from the second electronic device.

2. In the first paragraph, the control circuit, Based on determining that the first voltage is less than a second threshold value which is less than the first threshold value, the plurality of transistors included in the rectifier are controlled to rectify the power received from the second electronic device, An electronic device configured to change the connection state of said plurality of capacitors and said at least one coil from the second connection state to the first connection state.

3. In any one of paragraphs 1 to 2, the control circuit, Based on determining that the first voltage is less than a second threshold value which is less than the first threshold value, the connection state of the plurality of capacitors and the at least one coil is changed from the second connection state to the first connection state through the at least one switch, An electronic device configured to rectify the power received from the second electronic device by controlling the plurality of transistors included in the rectifier.

4. In any one of paragraphs 1 to 3, the control circuit, An electronic device configured to short-circuit a first transistor and a second transistor disposed on a low side of the plurality of transistors to ground so as to free-wheel the power received from the second electronic device.

5. In any one of paragraphs 1 to 4, An electronic device wherein the commutation operation of the rectifier is interrupted while free-wheeling the power received from the second electronic device.

6. In any one of paragraphs 1 to 5, the power receiving circuit, A first capacitor (223) and a second capacitor (224) connected in parallel with each other; A first coil (221) and a second coil (222) connected in parallel with each other; A first switch (S1) connected in series with the first capacitor; A second switch (S2) connected in parallel to each of the first capacitor and the second capacitor; and An electronic device including a third switch (S3) positioned between the first coil and the second coil.

7. In any one of paragraphs 1 to 6, the control circuit, In the above first connection state, the first switch is turned on, the second switch is turned off, and the third switch is turned on. An electronic device configured to turn off the first switch so that an equivalent capacitance value of the first electronic device is reduced in the second connection state.

8. In any one of paragraphs 1 to 7, the control circuit, In the above first connection state, the first switch is turned off, the second switch is turned off, and the third switch is turned on. An electronic device set to turn on the second switch so that the equivalent capacitance value of the first electronic device is reduced in the second connection state.

9. In any one of paragraphs 1 to 8, the control circuit, In the above first connection state, the first switch is turned off, the second switch is turned off, and the third switch is turned on. An electronic device set to turn off the third switch so that coupling to the first coil is reduced in the second connection state.

10. In any one of paragraphs 1 to 9, the control circuit, An electronic device set to determine the first voltage based on the voltage across the regulator (242) connected to the output terminal of the above rectifier.

11. In the operating method of the first electronic device (103) set to receive power wirelessly, An operation of wirelessly receiving AC power from a second electronic device (101) through a power receiving circuit (220) included in the first electronic device, wherein a plurality of capacitors (223, 224) and at least one coil (221, 222) included in the power receiving circuit are set to a first connection state corresponding to a frequency specified by the second electronic device through at least one switch; An operation of controlling a plurality of transistors included in a rectifier (255) included in the electronic device to rectify the power received from the second electronic device; An operation of checking a first voltage of power rectified into direct current through the rectifier included in the first electronic device; An operation of setting the plurality of capacitors and the at least one coil to a second connection state through the at least one switch so that the impedance by the plurality of capacitors increases based on determining that the first voltage is greater than the first threshold value; and A method of operating an electronic device, comprising an action of controlling the plurality of transistors included in the rectifier to free-wheel the power received from the second electronic device.

12. In paragraph 11, An operation of rectifying the power received from the second electronic device by controlling the plurality of transistors included in the rectifier based on determining that the first voltage is less than a second threshold value that is less than the first threshold value; and A method of operating an electronic device further comprising an operation of changing a connection state of the plurality of capacitors and the at least one coil from the second connection state to the first connection state.

13. In any one of paragraphs 11 to 12, An operation of changing the connection state of the plurality of capacitors and the at least one coil from the second connection state to the first connection state through the at least one switch based on determining that the first voltage is less than a second threshold value which is less than the first threshold value; and A method of operating an electronic device further comprising an operation of rectifying the power received from the second electronic device by controlling the plurality of transistors included in the rectifier.

14. In any one of paragraphs 11 to 13, the operation of free-wheeling the power received from the second electronic device comprises: An operating method of an electronic device including an operation of short-circuiting a first transistor and a second transistor arranged on a low side of the plurality of transistors to ground.

15. In any one of paragraphs 11 to 14, A method of operating an electronic device, wherein the commutation operation of the rectifier is interrupted while free-wheeling the power received from the second electronic device.

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