Electronic device for wirelessly receiving power and method of operating the same

Abstract

According to one embodiment, the electronic device (103) may include a coil (221), a rectifier circuit (255), a matching circuit (220) connected between the coil and the rectifier circuit, and a controller (250), wherein the matching circuit may include at least one diode, a first switch (Q2), a first capacitor (C1), a second capacitor (C2) connected in parallel with the first capacitor by the first switch, and a third capacitor (Cg). According to one embodiment, when the controller is powered off or inactive, the first switch may be turned on by energy charged in the third capacitor based on an alternating voltage induced in the coil from an external electronic device (101) to form a first resonant circuit including the first capacitor, the second capacitor, and the coil, wherein the first resonant circuit may be configured to receive alternating power of a first frequency from the external electronic device. According to one embodiment, the controller may be configured to control the first switch to an off state to form a second resonant circuit including the first capacitor and the coil when the controller is powered on or in an active state, wherein the second resonant circuit may be configured to receive alternating current power of a second frequency.

Description

Technology Field

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

[0002] With the advancement of wireless charging technology, methods are being researched to supply power to and charge various electronic devices using a single charging device. This wireless charging technology utilizes wireless power transmission and reception, and is a system that allows, for example, a battery to be automatically charged simply by placing an electronic device on a charging pad without connecting it via a separate charging connector.

[0003] Wireless charging technologies include electromagnetic induction, resonance, or radio frequency (RF) radiation, which converts electrical energy into microwaves for transmission.

[0004] The power transmission method via wireless charging is a method of transmitting power between a first coil at the transmitting end and a second coil at the receiving end. A magnetic field is generated at the transmitting end, and energy can be produced by inducing or resonating a current at the receiving end in response to changes in the magnetic field.

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

[0006] According to one embodiment, the electronic device (103) may include a coil (221), a rectifier circuit (255), a matching circuit (220) connected between the coil and the rectifier circuit, and a controller (250), wherein the matching circuit may include at least one diode, a first switch (Q2), a first capacitor (C1), a second capacitor (C2) connected in parallel with the first capacitor by the first switch, and a third capacitor (Cg). According to one embodiment, when the controller is powered off or inactive, the first switch may be turned on by energy charged in the third capacitor based on an alternating voltage induced in the coil from an external electronic device (101) to form a first resonant circuit including the first capacitor, the second capacitor, and the coil, wherein the first resonant circuit may be configured to receive alternating power of a first frequency from the external electronic device. According to one embodiment, the controller may be configured to control the first switch to an off state to form a second resonant circuit including the first capacitor and the coil when the controller is powered on or in an active state, wherein the second resonant circuit may be configured to receive alternating current power of a second frequency.

[0007] According to one embodiment, in a method of operation of an electronic device (103), the electronic device (103) may include a coil (221), a rectifier circuit (255), a matching circuit (220) connected between the coil and the rectifier circuit, and a controller (250), wherein the matching circuit may include at least one diode, a first switch (Q2), a first capacitor (C1), a second capacitor (C2) connected in parallel with the first capacitor by the first switch, and a third capacitor (Cg). According to one embodiment, the method of operation of the electronic device may include turning on the first switch by energy charged in the third capacitor based on an alternating voltage induced in the coil from an external electronic device (101) to form a first resonant circuit including the first capacitor, the second capacitor, and the coil when the controller included in the electronic device is powered off or inactive, wherein the first resonant circuit may be configured to receive alternating power of a first frequency from the external electronic device. According to one embodiment, the method of operation of the electronic device may include the operation of controlling the first switch to an off state by the controller to form a second resonant circuit including the first capacitor and the coil when the controller is powered on or in an active state, wherein the second resonant circuit may be configured to receive alternating current power of a second frequency. Brief explanation of the drawing

[0008] FIG. 1 is a block diagram of an electronic device that transmits power wirelessly and an electronic device that receives power wirelessly according to various embodiments. FIG. 2a is a block diagram of a wireless power transmitting device and a wireless power receiving device according to one embodiment. FIG. 2b is a circuit diagram of a wireless power transmitting device and a wireless power receiving device according to a comparative embodiment. FIG. 3 is a circuit diagram of a wireless power transmitting device and a wireless power receiving device according to one embodiment. FIG. 4 is a circuit diagram of a wireless power transmitting device and a wireless power receiving device according to one embodiment. FIG. 5 is a circuit diagram of a wireless power transmitting device and a wireless power receiving device according to one embodiment. FIGS. 6a and FIGS. 6b are circuit diagrams for a wireless power transmitting device and a wireless power receiving device according to one embodiment. FIG. 7 is a graph showing the voltage induced in the coil shown in FIG. 3 according to one embodiment, the rectified voltage output from the rectification circuit, the capacitor voltage of the third capacitor, and the capacitor voltage of the fourth capacitor. FIG. 8 is a graph showing the voltage induced in the coil shown in FIG. 5 according to one embodiment, the rectified voltage output from the rectifier circuit, and the capacitor voltage of the third capacitor. FIG. 9a is a flowchart for explaining operations related to a first switch of an electronic device according to one embodiment. FIG. 9b is a flowchart for explaining operations related to a first switch of an electronic device according to one embodiment. FIG. 10 is a flowchart illustrating the operation of a controller of an electronic device controlling a first switch according to one embodiment. FIG. 11 is a block diagram of an electronic device in a network environment according to one embodiment of the present disclosure. Specific details for implementing the invention

[0009] FIG. 1 is a block diagram of an electronic device that transmits power wirelessly (hereinafter, wireless power transmitting device (101)) and an electronic device that receives power wirelessly (hereinafter, wireless power receiving device (103)) according to various embodiments.

[0010] Referring to FIG. 1, a wireless power transmitting device (101) according to various embodiments may wirelessly transmit power (106) to a wireless power receiving device (103). Alternatively, the wireless power transmitting device (101) may receive information (107) from the wireless power receiving device (103). In one example, the wireless power transmitting device (101) may transmit power (106) according to an inductive method. When the wireless power transmitting device (101) is inductive, the wireless power transmitting device (101) may include, for example, 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. At least one capacitor may form a resonant circuit together with 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 capable of generating an induced magnetic field when current flows according to an induction method. The process of the wireless power transmission device (101) generating an induced magnetic field can be described as the wireless power transmission device (101) wirelessly transmitting power (106). Additionally, in the coil of the wireless power receiving 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 can be described as the wireless power receiving device (103) wirelessly receiving power (106).

[0011] A wireless power transmitting device (101) according to various embodiments can communicate with a wireless power receiving device (103). For example, the wireless power transmitting device (101) can communicate with the wireless power receiving device (103) according to an in-band method. The wireless power transmitting device (101) can perform modulation of data to be transmitted, for example, according to a frequency shift keying (FSK) modulation method, and the wireless power receiving device (103) can provide information (107) by performing modulation according to an amplitude shift keying (ASK) modulation method. The wireless power transmitting device (101) can check the information (107) provided by the wireless power receiving device (103) based on the amplitude of the current and / or voltage applied to the transmitting coil. In FIG. 1, it is illustrated that the wireless power receiving device (103) directly transmits information (107) to the wireless power transmitting device (101), but this is for ease of understanding only, and those skilled in the art will understand that the wireless power receiving device (103) controls only the on / off of at least one internal switch. The operation of performing modulation based on an ASK modulation method and / or an FSK modulation method can be understood as the operation of transmitting data (or packets) according to an in-band communication method, and the operation of performing demodulation based on an ASK demodulation method and / or an FSK demodulation method can be understood as the operation of receiving data (or packets) according to an in-band communication method.

[0012] In this document, when a wireless power transmitting device (101) or a wireless power receiving device (103) performs a specific operation, it may mean that various hardware included in the wireless power transmitting device (101) or the wireless power receiving 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 a wireless power transmitting device (101) or a wireless power receiving device (103) performs a specific operation, it may mean that a controller included in the wireless power transmitting device (101) or the wireless power receiving device (103) controls other hardware to perform a specific operation. Alternatively, the wireless power transmitting device (101) or the wireless power receiving device (103) performing a specific operation may mean that at least one instruction for performing a specific operation, which was stored in the storage circuit (e.g., memory) of the wireless power transmitting device (101) or the wireless power receiving device (103), is executed, thereby causing a controller or other hardware to perform a specific operation.

[0013] FIG. 2a is a block diagram of a wireless power transmitting device and a wireless power receiving device according to one embodiment.

[0014] Referring to FIG. 2a, according to one embodiment, a wireless power transmission device (101) may include a TX circuit (210), a first coil (211), and a capacitor (212).

[0015] 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 TA (travel adapter), a battery (not shown), a charger (not shown), or a PMIC (power management integrated circuit) (not shown) of a wireless power transmission device (101). According to one embodiment, the power provided by the power source may be provided to 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 the 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 converting and / or boost converting, but there is no limitation on the type thereof. The inverter can output AC power using the driving voltage provided by the DC / DC converter. For example, the inverter may include a plurality of switches capable of forming a full bridge circuit, and there is no limitation on the number of switches or the type of bridge circuit.

[0016] According to one embodiment, alternating current power generated by the TX circuit (210) may be induced or applied to the first coil (211). The capacitor (212) may be a series compensation capacitor of the first coil (211). The first coil (211) may form a magnetic field based on the induced or applied alternating current power. A portion of the magnetic field (or magnetic flux) formed by the first coil (211) may be induced or applied to the second coil (221) of the wireless power receiving device (103). As the magnetic field induced or applied to the second coil (221) of the wireless power receiving device (103) changes over time, an induced electromotive force (e.g., current, voltage, or power) may be generated in the second coil (221) of the wireless power receiving device (103). Depending on the implementation, the wireless power receiving device (103) may include at least one additional coil in addition to the second coil (221). For example, a portion of the magnetic field (or magnetic flux) formed by the first coil (211) may be induced or applied to at least one coil of the wireless power receiving device (103), and the wireless power receiving device (103) may obtain power based thereon.

[0017] According to one embodiment, the TX circuit (210) can check information provided by the wireless power receiving device (103) through the first coil (211). The TX circuit (210) can perform, for example, analog-to-digital converting (ADC) on the signal received through the first coil (211). The TX circuit (210) can decode the digital value obtained as an ADC result and check information provided by the wireless power receiving device (103) based on the decoding result. Those skilled in the art will understand that the decoding method may be based on, for example, the Qi standard, but is not limited thereto.

[0018] According to one embodiment, the wireless power receiving device (103) may include at least one of a coil (221), a matching circuit, an RX circuit (240), a charger (244), or a battery (260). For example, the matching circuit may include a first capacitor (C1), a second capacitor (C2) connected in parallel with the first capacitor (C1), and a first switch (Q2) connected in series with the second capacitor (C2).

[0019] According to one embodiment, the coil (221) and the matching circuit may form an LC resonant circuit (or resonant circuit). For example, the LC resonant circuit may provide alternating current power to the RX circuit (240) (e.g., the rectifier circuit (255) of FIG. 3) based on the induced electromotive force (e.g., current, voltage, or power) generated by the coil (221).

[0020] According to one embodiment, the coil (221), the first capacitor (C1), or the second capacitor (C2) may form an LC resonant circuit corresponding to a frequency specified by the wireless power transmission device (101). For example, as the first switch (Q2) is turned on or off, a resonant circuit corresponding to two frequency regions may be formed. For example, when the first switch is turned on, the coil (221), the first capacitor (C1), and the second capacitor (C2) may form a resonant circuit corresponding to a specified first frequency (e.g., a relatively low frequency). For example, when the first switch (Q2) is turned off, the coil (221) and the first capacitor (C1) may form a resonant circuit corresponding to a specified second frequency (e.g., a relatively high frequency).

[0021] According to one embodiment, the RX circuit (240) can convert (or rectify) the AC power received through the resonant circuit into DC power and output or provide the converted DC power to the charger (244). The charger (or charging circuit) (244) can charge the battery (260) using the power converted by the RX circuit (240).

[0022] FIG. 2b is a circuit diagram of a wireless power transmitting device and a wireless power receiving device according to a comparative embodiment.

[0023] FIG. 3 is a block diagram of a wireless power transmitting device and a wireless power receiving device according to one embodiment.

[0024] Referring to FIG. 2b and FIG. 3, according to one embodiment, a wireless power receiving device (103) may include at least one of a coil (221), a matching circuit (220), a gate driver (230), an LDO (235), a controller (250), a rectifier circuit (255), a regulator (242), or a charger (244).

[0025] According to a comparative embodiment, the conventional wireless power receiving device (103-1) shown in FIG. 2b may be implemented identically or similarly to the wireless power receiving device (103) of FIG. 3, except for the matching circuit (220-1).

[0026] According to one embodiment, the coil (221) and the matching circuit (220) may form an LC resonant circuit (or resonant circuit). For example, the LC resonant circuit may provide alternating current power to a rectifier circuit (255) based on the induced electromotive force (e.g., current, voltage, or power) generated by the coil (221).

[0027] According to one embodiment, the matching circuit (220) may include a first capacitor (C1), a second capacitor (C2), and a first switch (Q2). The second capacitor (C2) may be connected in parallel with the first capacitor (C1) through the first switch (Q2). For example, the first switch (Q2) may be implemented as a field effect transistor (MOSFET).

[0028] According to one embodiment, the coil (221), the first capacitor (C1), or the second capacitor (C2) may form an LC resonant circuit corresponding to a frequency specified by the wireless power transmission device (101). For example, when the first switch (Q2) is turned on, the coil (221), the first capacitor (C1), and the second capacitor (C2) may form a resonant circuit corresponding to a specified first frequency (e.g., a relatively low frequency). For example, when the first switch (Q2) is turned off, the coil (221) and the first capacitor (C1) may form a resonant circuit corresponding to a specified second frequency (e.g., a relatively high frequency).

[0029] According to one embodiment, a rectifier circuit (or rectifier) ​​(255) can rectify power received from a wireless power transmission device (101) through a plurality of switches (or a plurality of transistors) (S1, S2, S3, S4) controlled by a controller (250). The rectifier circuit (255) can rectify (or convert) the AC power received from the wireless power transmission device (101) into DC power and output or provide the rectified DC power to a regulator (242). For example, each of the plurality of switches (or a plurality of transistors) (S1, S2, S3, S4) may be implemented as a field effect transistor (MOSFET). Meanwhile, the number or type of transistors shown in FIG. 3 is merely exemplary, and embodiments of the present invention may not be limited thereto.

[0030] According to one embodiment, the rectifier circuit (255) may include a plurality of switches (or a plurality of transistors) (S1, S2, S3, S4) that can operate as a full bridge circuit or a voltage doubler circuit.

[0031] According to one embodiment, one end of the coil (221) may be connected to a connection point between transistors (S3, S4), and the other end of the coil (221) may be connected to a connection point between transistors (S1, S2). For example, one end of the first transistor (S1) and one end of the fourth transistor (S4) may be connected to a regulator (242), one end of the second transistor (S2) may be connected to the other end of the first transistor (S1), and one end of the third transistor (S3) may be connected to the other end of the fourth transistor (S4). The other end of the second transistor (S2) and the other end of the third transistor (S3) may be connected to ground. The other end of the first transistor (S1) and the other end of the second transistor (S2) can be connected to the other end of the coil (221), and the one end of the third transistor (S3) and the other end of the fourth transistor (S4) can be connected to the one end of the coil (221). The rectifier circuit (255) can convert AC power received through the coil (221) into DC power. The controller (250) can control the on / off state of a plurality of transistors (S1, S2, S3, S4) so ​​that AC power can be converted into DC power. The controller (250) can rectify the power signal (e.g., AC signal or AC power) received from the coil (221) and supply the rectified power signal (e.g., DC signal or DC power) to the regulator (242).

[0032] According to one embodiment, the rectifier circuit (255) may be connected to a regulator (242). The regulator (242) may perform voltage conversion (e.g., buck conversion and / or boost conversion) and / or regulation of the rectified power output from the rectifier circuit (255).

[0033] According to one embodiment, the charger (or charging circuit) (244) may charge the battery (260) using power converted and / or regulated by the regulator (242). Alternatively, the charger (or charging circuit) (244) may provide power converted and / or regulated by the regulator (242) to components of the wireless power receiving device (103), e.g., a controller (250)). Depending on the implementation, a PMIC (not shown) may be connected to the regulator (242) in place of the charger (244).

[0034] According to one embodiment, the controller (250) can check or monitor the rectified voltage (VRECT) of the power output from the rectification circuit (255). For example, the controller (250) can check the rectified voltage (VRECT) based on the voltage across the regulator (242). For example, the wireless power receiving device (103) may further include a sensing circuit (not shown) for sensing the rectified voltage (VRECT). For example, the controller (250) may include a resistor in the sensing circuit and check the rectified voltage (VRECT) by checking the voltage value applied to the resistor.

[0035] According to one embodiment, the controller (250) can alternately turn on / off a plurality of switches (S1, S2, S3, S4) included in the rectifier circuit (255) while receiving power wirelessly from the wireless power transmission device (101) through the resonant circuit. For example, the control circuit (250) can turn on one switch (S1, S3) and turn off another switch (Q2, Q4) during a first time period. The control circuit (250) can turn on one switch (S2, S4) and turn off another switch (S1, S3) during a second time period different from the first time period. The control circuit (250) can check the rectified voltage (VRECT) of the rectifier circuit (255) while the plurality of switches (S1, S2, S3, S4) are turned on / off.

[0036] According to one embodiment, the controller (250) can control the first switch (Q2) by controlling the gate driver (230). For example, the controller (250) can turn the first switch (Q2) on or off using the gate driver (230).

[0037] According to one embodiment, a gate driver (230), an LDO (235), a third diode (D3), a rectifier circuit (255), and a regulator (242) may be included in the RX circuit (240) shown in FIG. 2a. For example, the LDO (235) may be supplied with a rectified voltage (VRECT) output from the rectifier circuit (255) or a voltage stored in a battery (e.g., the battery (260) in FIG. 2a). The LDO (235) may convert the supplied voltage to a specified voltage (e.g., 5V) and output the converted voltage. For example, the LDO (235) may be supplied with the specified voltage or a voltage higher than the specified voltage. Alternatively, the LDO (235) may be supplied with a voltage lower than the specified voltage (e.g., 3.7 to 4.5V). For example, the voltage output by the LDO (235) can be applied to the gate driver (230) through the third diode (D3).

[0038] Referring to FIG. 2b, according to a comparative embodiment, when the power stored in the battery (e.g., the battery (260) of FIG. 2a) is depleted, the first switch (Q2) included in the matching circuit (220-1) may be in an off state. For example, if the frequency of the alternating voltage induced or applied to the coil (221) is low, the coil (221) and the matching circuit (220) may not be able to form a resonant circuit corresponding to said frequency. For example, a low-frequency alternating voltage may be induced or applied to the coil (221) during the initial stage of wireless charging. That is, since the existing wireless power receiving device (103-1) may not be able to form a suitable resonant circuit for a low-frequency alternating voltage, the wireless power receiving device (103-1) may not be able to obtain suitable power even if power is supplied from the wireless power transmitting device (101).

[0039] Referring to FIG. 3, according to one embodiment, the first switch (Q2) may be turned on by energy charged in the third capacitor (Cg) based on an alternating voltage induced in the coil (221) from an external electronic device (e.g., the wireless power transmitter (101) of FIG. 3) to form a first resonant circuit when the controller (250) is powered off (or inactive). The first resonant circuit may be configured to receive alternating power of a first frequency from the external electronic device (101). For example, the first resonant circuit may include a first capacitor (C1), a second capacitor (C2), and a coil (221). For example, the first frequency may correspond to the frequency of the alternating power received during the initial stage of wireless charging. For example, when the battery included in the electronic device (103) (e.g., the battery (260) of FIG. 2) is completely discharged (or as a result of being completely discharged), the controller (250) may be powered off or inactive. For example, when the controller (250) is powered off as a result of the battery (260) included in the electronic device (103) being completely discharged, a part of the matching circuit including the third capacitor (Cg) may be set or configured to turn on the first switch (Q2) using alternating current power received through the coil (221).

[0040] According to one embodiment, the first switch (Q2) may be controlled to an off state by the controller (250) to form a second resonant circuit when the controller (250) is powered on or active. That is, the controller (250) may control the first switch (Q2) to an off state to form a second resonant circuit when the controller (250) is powered on or active. The second resonant circuit may be configured to receive alternating current power of a second frequency. For example, the second frequency may be higher than the first frequency. For example, the second resonant circuit may include a first capacitor (C1) and a coil (221). For example, when a battery included in the electronic device (103) (e.g., battery (260) of FIG. 2) is charged enough to control the first switch (Q2), the controller (250) may be powered on or active.

[0041] According to one embodiment, the controller (250) may control the first switch (Q2) to the ON state to form a first resonant circuit to receive alternating current power of a first frequency when the controller (250) is powered on or in an active state.

[0042] According to one embodiment, the first switch (Q2) may be turned on based on an alternating voltage induced or applied to the coil (221) from the wireless power transmission device (101). As the first switch (Q2) is turned on, the first capacitor (C1) and the second capacitor (C2) may be connected in parallel. Based on the first switch (Q2) being turned on, the resonance time constant of the coil (221), the first capacitor (C1), and the second capacitor (C2) may be determined or changed. For example, the resonance time constant may correspond to a relatively low resonance frequency. For example, the first switch (Q2) may be turned on without control by the controller (250) even if a low-frequency alternating voltage is induced or applied to the coil (221) during the initial stage of wireless charging. For example, the first switch (Q2) may be turned on even if the power stored in the battery (260) is depleted. A resonant circuit including a coil (221), a first capacitor (C1), and a second capacitor (C2) can be configured based on the first switch (Q2) being turned on, and alternating current power received from a wireless power transmission device (101) can be supplied to a rectifier circuit (255) through the resonant circuit.

[0043] According to one embodiment, the controller (250) can check or monitor the rectified voltage (VRECT) output from the rectification circuit (255). For example, the controller (250) can check whether the rectified voltage (VRECT) is higher than a specified voltage (e.g., 5V).

[0044] According to one embodiment, the controller (250) can control the first switch (Q2) through the gate driver (230) based on confirming that the rectified voltage (VRECT) is higher than the specified voltage. For example, the controller (250) can output a corresponding control signal to the gate driver (230) to turn the first switch (Q2) on or off when the rectified voltage (VRECT) is higher than the specified voltage.

[0045] According to one embodiment, the first switch (Q2) can be controlled by a controller (250) (or a gate driver (230)) when the rectified voltage (VRECT) is higher than a specified voltage.

[0046] According to one embodiment, the matching circuit (220) may further include a first diode (D1), a second diode (D2), a third capacitor (Cg), a fourth capacitor (Cs), a Zener diode (Dg), a first resistor (Rg), and a second resistor (Rs).

[0047] According to one embodiment, the first diode (D1) may be connected to the second diode (D2) and the fourth capacitor (Cs). Additionally, the first diode (D1) may be connected to the gate of the gate driver (230), the third capacitor (Cg), the Zener diode (Dg), and the first switch (Q2) through the first resistor (Rg). For example, the first diode (D1) may be configured to prevent current provided from the gate driver (230) from flowing into the fourth capacitor (Cs) (e.g., preventing reverse current). For example, when the voltage induced or applied to one end of the coil (221) has a positive value, the sum of the voltage applied to said end and the capacitor voltage of the third capacitor (Cg) may be greater than the capacitor voltage of the fourth capacitor (Cs). In this case, the first diode (D1) may prevent the conduction of reverse current.

[0048] According to one embodiment, the second diode (D2) may be connected to one end of the coil (221). Additionally, the second diode (D2) may be connected to the first diode (D1) and the fourth capacitor (Cs). For example, the anode of the second diode (D2) may be connected to one end of the coil (221), and the cathode of the second diode (D2) may be connected to the first diode (D1) and the fourth capacitor (Cs).

[0049] According to one embodiment, the second diode (D2) can provide current to the fourth capacitor (Cs) from the alternating voltage induced or applied to the coil (221). The current provided by the second diode (D2) can be supplied to the fourth capacitor (Cs), and the capacitor voltage can be charged (or raised) to the maximum value of the absolute value of the alternating voltage induced or applied to the coil (221).

[0050] According to one embodiment, the fourth capacitor (Cs) may be connected in parallel between the first diode and the second diode. For example, the voltage based on the energy charged in the fourth capacitor (Cs) may be a voltage corresponding to the maximum absolute value of the AC voltage of the coil (221). The voltage of the fourth capacitor (Cs) may charge the third capacitor (Cg) through the first diode (D1). For example, the voltage corresponding to the energy charged in the fourth capacitor (Cs) may charge the third capacitor (Cg) through a bootstrap structure.

[0051] According to one embodiment, a third capacitor (Cg) may be placed between the gate and source of the first switch (Q2). For example, a capacitor voltage corresponding to the energy charged in the third capacitor (Cg) may be applied to the first switch (Q2) (or the gate of the first switch (Q2)). For example, the third capacitor (Cg) may be charged by a capacitor voltage corresponding to the energy charged in the fourth capacitor (Cs). The first switch (Q2) may be turned on based on the capacitor voltage corresponding to the energy charged in the third capacitor (Cg) being applied to the gate of the first switch (Q2).

[0052] According to one embodiment, the capacitance of the third capacitor (Cg) and the capacitance of the fourth capacitor (Cs) can be determined as shown in Equation 1 below. For example, Tc represents the period of the alternating voltage induced or applied to the coil (221), Ilk represents the leakage current between the gate and source of the first switch (Q2), VthQ2 represents the threshold voltage of the gate of the first switch, C11 represents the capacitance of the third capacitor (Cg), C12 represents the capacitance of the fourth capacitor (Cs), and Vc represents the alternating voltage induced or applied to the coil (221).

[0054]

[0056] According to one embodiment, the value obtained by subtracting the value obtained by dividing the sum of the capacitance of the third capacitor (Cg) and the capacitance of the fourth capacitor (Cs) from the product of the leakage current between the gate and source of the first switch (Q2) and the period of the alternating voltage from the first value corresponding to the peak of the alternating voltage induced or applied to the coil (221) may be greater than the threshold voltage of the gate of the first switch (Q2).

[0057] According to one embodiment, the first resistor (Rg) may be connected to one end (e.g., cathode) of the first diode (D1) and a point between the gate of the first switch (Q2) and the gate driver (230). When the first switch (Q2) is controlled by the controller (250) (or gate driver (230)), the voltage corresponding to the alternating voltage induced or applied to the coil (221) may be blocked from being supplied to the first switch (Q2) by the first resistor (Rg). At this time, the first switch (Q2) may not be controlled by the voltage stored in the third capacitor (Cg). For example, when the first switch (Q2) is normally controlled by the controller (250) (or gate driver (230)), the first switch (Q2) may be controlled in the same way as before.

[0058] According to one embodiment, a Zener diode (Dg) may be placed between the gate and source of the first switch (Q2). Additionally, the Zener diode (Dg) may be connected in parallel with a third capacitor (Cg). For example, the Zener diode (Dg) can clamp the voltage applied to the first switch (Q2) (or the gate of the first switch (Q2)) to a certain level because the absolute value of the voltage applied to the first switch (Q2) by the third capacitor (Cg) may be greater than the withstand voltage of the first switch (Q2). For example, the certain level may be determined based on the withstand voltage of the first switch (Q2).

[0059] According to one embodiment, the first switch (Q2) may be turned on based on the capacitor voltage corresponding to the energy charged in the third capacitor (Cg) being applied to the gate of the first switch (Q2). At this time, the first switch (Q2) may not be normally controlled by the controller (250) (or gate driver (230)). As the first switch (Q2) is turned on, the first capacitor (C1) and the second capacitor (C2) may be connected in parallel. Based on the first switch (Q2) being turned on, the resonance time constant of the coil (221), the first capacitor (C1), and the second capacitor (C2) may be determined or changed. For example, the resonance time constant may correspond to a relatively low resonance frequency. For example, based on the first switch (Q2) being turned on, the matching circuit (220) may form a resonance circuit including the coil (221), the first capacitor (C1), and the second capacitor (C2). For example, the above resonant circuit can correspond to the frequency of the alternating current power received during the initial stage of wireless charging.

[0060] According to one embodiment, alternating current power received through a resonant circuit including a coil (221), a first capacitor (C1), and a second capacitor (C2) can be supplied to a rectifier circuit (255). Subsequently, the controller (250) can control a first switch (Q2) (e.g., control the first switch (Q2) to be on or off) using the power output from the rectifier circuit (255).

[0061] According to one embodiment, the controller (250) can check the rectified voltage (VRECT) output from the rectification circuit (255). For example, the controller (250) can check whether the rectified voltage (VRECT) is greater than a specified voltage. For example, the specified voltage may represent a reference voltage at which the controller (250) can normally control the first switch (Q2) through the gate driver (230).

[0062] According to one embodiment, the controller (250) can control the first switch (Q2) through the gate driver (230) based on determining that the rectified voltage (VRECT) is greater than the specified voltage. For example, when sufficient power is not stored in the battery (e.g., battery (260) of FIG. 2) and the rectified voltage (VRECT) is not greater than the specified voltage, the first switch (Q2) can be controlled to the ON state by a voltage corresponding to the energy charged in the third capacitor (Cg). For example, when sufficient power is stored in the battery (e.g., battery (260) of FIG. 2) or the rectified voltage (VRECT) is greater than the specified voltage, the first switch (Q2) can be controlled by the controller (250) (or the gate driver (230)).

[0063] According to one embodiment, the controller (250) may provide a control signal to the gate driver (230) to control the first switch (Q2). For example, the controller (250) may output a signal of a first level (e.g., low level) to the gate driver (230) to turn on the first switch (Q2). The controller (250) may output a signal of a second level (e.g., high level) to the gate driver (230) to turn off the first switch (Q2).

[0064] According to one embodiment, the gate driver (230) may include a plurality of transistors (Qg1, Qg2). For example, the first transistor (Qg1) may be implemented as a p-type metal oxide semiconductor field effect transistor (MOSFET). For example, the second transistor (Qg2) may be implemented as an n-type metal oxide semiconductor field effect transistor (MOSFET).

[0065] According to one embodiment, a rectified voltage (VRECT) may be applied as a source voltage to the gate driver (230) through the LDO (235) and the third diode (D3). For example, when a specified voltage (e.g., 5V) is applied to the gate driver (230), the gate driver (230) may operate normally. For example, when a voltage of a first level (e.g., low level) is applied to the gate of the first transistor (Qg1) and the gate of the second transistor (Qg2), the second transistor (Qg2) may be turned on. As the second transistor (Qg2) is turned on, the gate driver (230) may output a low voltage (e.g., 0V) to the first switch (Q2). At this time, the first switch (Q2) may be controlled to an off state. For example, when a voltage of the second level (e.g., high level) is applied to the gate of the first transistor (Qg1) and the gate of the second transistor (Qg2), the first transistor (Qg1) can be turned on. As the first transistor (Qg1) is turned on, the gate driver (230) can output a High (e.g., 5V) voltage to the first switch (Q2). At this time, the first switch (Q2) can be controlled to be in the ON state.

[0066] Based on the method described above, even when the first switch (Q2) is not normally controlled by the controller (250) (or gate driver (230)), the wireless power receiving device (103) can control the first switch (Q2) to the ON state using an alternating voltage induced or applied to the coil (221). For example, when the power stored in the battery of the wireless power receiving device (103) (e.g., the battery (260) in FIG. 2a) is insufficient and an alternating voltage in the low frequency band is induced or applied during the initial stage of wireless charging, the first switch (Q2) can be turned ON without control by the controller (250) (or gate driver (230)). Through this, the wireless power receiving device (103) can configure a resonant circuit corresponding to the low frequency band and obtain power of an appropriate size through the resonant circuit.

[0067] FIG. 4 is a circuit diagram of a wireless power transmitting device and a wireless power receiving device according to one embodiment.

[0068] Referring to FIG. 4, the wireless power receiving device (103) may be identical to that shown in FIG. 3, except for the connection between the second diode (D2) and the coil.

[0069] According to one embodiment, the second diode (D2) may be connected to the other end of the coil (221). For example, the anode of the second diode (D2) may be connected to the other end of the coil (221), and the cathode of the second diode (D2) may be connected to the first diode (D1) (or the anode of the first diode (D1)) and the fourth capacitor (Cs).

[0070] As described above, since the voltage corresponding to the maximum absolute value of the alternating current voltage induced or applied to the coil (221) is charged to the fourth capacitor (Cs), the coil (221) and the second diode (D2) may be connected by any one of the connection types shown in FIG. 3 and FIG. 4.

[0071] FIG. 5 is a circuit diagram of a wireless power transmitting device and a wireless power receiving device according to one embodiment.

[0072] Referring to FIG. 5, the wireless power receiving device (103) may exclude the fourth diode (D2) and the fourth capacitor (Cs) compared to that shown in FIG. 3.

[0073] According to one embodiment, the first diode (D1) may be connected to one end of the coil (221). For example, the first diode (D1) may prevent current provided from the gate driver (230) from flowing to the coil end (e.g., preventing reverse current).

[0074] According to one embodiment, the capacitance of the third capacitor (Cg) can be determined as shown in Equation 2 below. For example, Tc represents the period of the alternating voltage induced or applied to the coil (221), Ilk represents the leakage current between the gate and source of the first switch (Q2), VthQ2 represents the threshold voltage of the gate of the first switch, C11 represents the capacitance of the third capacitor (Cg), and Vc represents the alternating voltage applied to the coil (221).

[0076]

[0078] According to one embodiment, the value obtained by subtracting the value obtained by dividing the capacitance of the third capacitor (Cg) from the product of the leakage current between the gate and source of the first switch (Q2) and the period of the alternating voltage from the first value corresponding to the peak of the alternating voltage induced or applied to the coil (221) may be greater than the threshold voltage of the gate of the first switch (Q2). For example, when the condition of Equation 2 is satisfied, the wireless power receiving device (103) may exclude the fourth diode (D2) and the fourth capacitor (Cs) from the wireless power receiving device (103) of FIG. 3.

[0079] According to one embodiment, energy can be charged in the third capacitor (Cg) by an alternating voltage induced or applied to the coil (221). The first switch (Q2) can be turned on based on a voltage corresponding to the energy charged in the third capacitor (Cg). For example, the wireless power receiving device (103) can control the first switch (Q2) to the ON state without control by the controller (250) (or gate driver (230)) during the initial stage of wireless charging.

[0080] The wireless power receiving device (103) of FIG. 5 above can be operated for the same function and purpose, except that the fourth diode (D2) and the fourth capacitor (Cs) are excluded compared to that described in FIG. 3.

[0081] FIGS. 6a and FIGS. 6b are circuit diagrams for a wireless power transmitting device and a wireless power receiving device according to one embodiment.

[0082] Referring to FIG. 6a, according to one embodiment, the wireless power receiving device (103) may further include a low pass filter (LPF) (610) in the wireless power receiving device of FIG. 3. For example, the low pass filter (610) may be placed between one end of the coil (221) and the second diode (D2). The low pass filter (610) may be configured to pass an alternating voltage of a specified frequency band (e.g., low frequency band).

[0083] Referring to FIG. 6b, according to one embodiment, the wireless power receiving device (103) may further include a low-pass filter (610) in addition to the wireless power receiving device of FIG. 5. The low-pass filter (610) may be placed between one end of the coil (221) and the first diode (D2).

[0084] Although not shown in FIG. 6a, the wireless power receiving device (103) may further include a low-pass filter (610) in addition to the wireless power receiving device of FIG. 4. For example, the low-pass filter (610) may be placed between one end of the coil (221) of FIG. 4 and the second diode (D2).

[0085] According to one embodiment, when an alternating voltage in a low frequency band is induced or applied to the coil (221), the alternating voltage can be passed through a low-pass band (610). That is, when an alternating voltage in a low frequency band is induced or applied to the coil (221), the first switch (Q2) can be turned on based on the alternating voltage filtered through the low-pass filter (610).

[0086] According to one embodiment, when an alternating voltage in the high frequency band is induced or applied to the coil (221), the alternating voltage may not pass through the low-pass band (610). That is, when an alternating voltage in the high frequency band is induced or applied to the coil (221), the first switch (Q2) may not be turned on.

[0087] According to one embodiment, when the first switch (Q2) is turned on, an LC resonant circuit including a coil (221), a first capacitor (C1), and a second capacitor (C2) can respond to a low resonant frequency. When the first switch (Q2) is turned on when a high-frequency alternating voltage is induced or applied to the coil (221), the power reception efficiency of the wireless power receiving device (103) may be further reduced. Therefore, a low-pass filter (610) may be further included so that the first switch (Q2) is turned on only when a low-frequency band alternating voltage is induced or applied to the coil (221).

[0088] Based on the method described above, the first switch (Q2) can be turned on without control by the controller (250) even if a low-frequency alternating voltage is induced or applied to the coil (221) during the initial stage of wireless charging. For example, a resonant circuit including the coil (221), the first capacitor (C1), and the second capacitor (C2) can be configured based on the first switch (Q2) being turned on even if the power stored in the wireless power receiving device (103) (e.g., the battery (260) in FIG. 2a) is depleted, and the alternating power received from the wireless power transmitting device (101) can be supplied to the rectifier circuit (255) through the resonant circuit. Through this, the wireless power receiving device (103) can perform normal operation for wireless charging even if the stored power is depleted.

[0089] FIG. 7 is a graph showing the voltage induced in the coil shown in FIG. 3 according to one embodiment, the rectified voltage output from the rectification circuit, the capacitor voltage of the third capacitor, and the capacitor voltage of the fourth capacitor.

[0090] Referring to FIG. 7, according to one embodiment, the first graph (710) may represent an alternating voltage (Vc) induced or applied to the coil (221) of FIG. 3. For example, the alternating voltage (Vc) may be an alternating voltage of a relatively low frequency. The second graph (720) may represent a rectified voltage (VRECT) output from the rectifier circuit (255) of FIG. 3. The third graph (730) may represent the first capacitor voltage (VCs) of the fourth capacitor (Cs) of FIG. 3. For example, Type B may represent a circuit type as shown in FIG. 3, and the graph of Type B may represent the capacitor voltage (VCs) of the fourth capacitor (Cs) when one end of the coil (221) is connected to the first diode (D1). For example, Type A can represent a circuit type such as that shown in FIG. 4, and the graph of Type A can represent the capacitor voltage (VCs) of the fourth capacitor (Cs) when the other end of the coil (221) is connected to the first diode (D1). The fourth graph (740) can represent the second capacitor voltage (VCg) of the third capacitor (Cg).

[0091] According to one embodiment, while an alternating voltage (Vc) is induced or applied to the coil (221) as in the first graph (710), a rectified voltage (VRECT) may be output from the rectification circuit (255). However, when the first switch (Q2) is in the off state, the rectified voltage (VRECT) may not have a sufficient magnitude to perform an operation for wireless charging.

[0092] According to one embodiment, while an alternating voltage (Vc) is induced or applied to the coil (221) as in the first graph (710), the second capacitor voltage (VCs) of the fourth capacitor (Cs) may be increased as in the third graph (730). For example, the second capacitor voltage (VCs) may be increased to the maximum value of the absolute value of the alternating voltage (Vc). As in the fourth graph (740), the first capacitor voltage (VCg) of the third capacitor (Cg) may be increased by the second capacitor voltage (VCs). When the first capacitor voltage (VCg) becomes greater than the threshold voltage (Vth) of the first switch (Q2), the first switch (Q2) may be controlled to the ON state. Based on the first switch (Q2) being controlled to the ON state, the resonance time constant of the coil (221), the first capacitor (C1), and the second capacitor (C2) may be determined or changed.

[0093] According to one embodiment, as shown in the second graph (720), when the first switch (Q2) is in the ON state, the rectified voltage (VRECT) can be increased to a size sufficient to perform wireless charging operations. At this time, a rectified voltage (VRECT) of a specified size (e.g., 5V) capable of controlling the first switch (Q2) can be supplied to the gate driver (230). When the rectified voltage (VRECT) of the specified size is supplied to the gate driver (230), the controller (250) can control the first switch (Q2) through the gate driver (230).

[0094] FIG. 8 is a graph showing the voltage induced in the coil shown in FIG. 5 according to one embodiment, the rectified voltage output from the rectifier circuit, and the capacitor voltage of the third capacitor.

[0095] Referring to FIG. 8, according to one embodiment, the fifth graph (810) may represent an alternating voltage (Vc) induced or applied to the coil (221) of FIG. 5. For example, the alternating voltage (Vc) may be an alternating voltage of a relatively low frequency. The sixth graph (820) may represent a rectified voltage (VRECT) output from the rectifier circuit (255) of FIG. 5. The seventh graph (830) may represent the capacitor voltage (VCg) of the third capacitor (Cg) of FIG. 5.

[0096] According to one embodiment, while an alternating voltage (Vc) is induced or applied to the coil (221) as in the first graph (810), a rectified voltage (VRECT) may be output from the rectification circuit (255). However, when the first switch (Q2) is in the off state, the rectified voltage (VRECT) may not have a sufficient magnitude to perform an operation for wireless charging.

[0097] According to one embodiment, while an alternating voltage (Vc) is induced or applied to the coil (221) as in the first graph (810), the first capacitor voltage (VCg) of the third capacitor (Cg) may be increased as in the third graph (830). When the first capacitor voltage (VCg) becomes greater than the threshold voltage (Vth) of the first switch (Q2), the first switch (Q2) may be controlled to be in the ON state. Based on the first switch (Q2) being controlled to be in the ON state, the resonance time constant of the coil (221), the first capacitor (C1), and the second capacitor (C2) may be determined or changed.

[0098] According to one embodiment, as shown in the second graph (820), when the first switch (Q2) is in the ON state, the rectified voltage (VRECT) can be increased to a size sufficient to perform wireless charging operations. At this time, a rectified voltage (VRECT) of a specified size (e.g., 5V) capable of controlling the first switch (Q2) can be supplied to the gate driver (230). When the rectified voltage (VRECT) of the specified size is supplied to the gate driver (230), the controller (250) can control the first switch (Q2) through the gate driver (230).

[0099] Meanwhile, for convenience of explanation, the wireless power receiving device (103) will be referred to as an electronic device (103) (e.g., an electronic device that receives power wirelessly), and the wireless power transmitting device (101) will be referred to as an external electronic device (e.g., an electronic device that transmits power wirelessly). Additionally, the operation of the electronic device (103) may be controlled by a controller (250), but for convenience of explanation, the subject of the operation will be described as the electronic device (103).

[0100] FIG. 9a is a flowchart for explaining operations related to a first switch of an electronic device according to one embodiment.

[0101] Referring to FIG. 9a, according to one embodiment, in operation 901, a first switch (Q2) included in an electronic device (e.g., wireless power receiving device (103) of FIG. 3, 4, 5, 6a, or 6b) may be turned on by energy charged in a third capacitor (Cg) based on an alternating voltage induced in a coil (221) from an external electronic device (e.g., wireless power transmitting device (101) of FIG. 3) to form a first resonant circuit when the controller (e.g., controller (250) of FIG. 3) is powered off (or powered off) or in an inactive state. The first resonant circuit may be configured to receive alternating power of a first frequency from the external electronic device (101). For example, the first resonant circuit may include a first capacitor (C1), a second capacitor (C2), and a coil (221). For example, the first frequency may correspond to the frequency of the alternating current power received during the initial stage of wireless charging. For example, when the battery (e.g., the battery (260) of FIG. 2) included in the electronic device (103) is completely discharged (or as a result of being completely discharged), the controller (250) may be powered off or inactive. For example, when the controller (250) is powered off as a result of the battery (260) included in the electronic device (103) being completely discharged, a part of the matching circuit including the third capacitor (Cg) may be set or configured to turn on the first switch (Q2) using the alternating current power received through the coil (221).

[0102] According to one embodiment, in operation 903, the first switch (Q2) may be controlled to an off state by the controller (250) to form a second resonant circuit when the controller (250) is powered on or active. That is, the controller (250) may control the first switch (Q2) to an off state to form a second resonant circuit when the controller (250) is powered on or active. The second resonant circuit may be configured to receive alternating current power of a second frequency. For example, the second frequency may be higher than the first frequency. For example, the second resonant circuit may include a first capacitor (C1) and a coil (221). For example, when a battery included in the electronic device (103) (e.g., battery (260) of FIG. 2) is charged enough to control the first switch (Q2), the controller (250) may be powered on or active.

[0103] FIG. 9b is a flowchart for explaining operations related to a first switch of an electronic device according to one embodiment.

[0104] Referring to FIG. 9b, according to one embodiment, in operation 931, when an electronic device (e.g., the wireless power receiving device (103) of FIG. 3, 4, 5, 6a, or 6b) receives power from an external electronic device (e.g., the wireless power transmitting device (101) of FIG. 3), the alternating voltage received from the external electronic device (101) may be induced or applied to the coil (221) of the electronic device (103). For example, the electronic device (103) may include various types of wearable electronic devices. For example, the frequency of the alternating voltage induced or applied to the coil (221) during the initial stage of wireless charging may be a relatively low frequency.

[0105] According to one embodiment, in operation 933, the first switch (Q2) may be turned on based on the alternating voltage induced (or applied) to the coil (221) without control by the controller (250). As the first switch (Q2) is turned on, the first capacitor (C1) and the second capacitor (C2) included in the matching circuit (220) may be connected in parallel with each other. Accordingly, a resonant circuit comprising the coil (221), the first capacitor (C1), and the second capacitor (C2) may be formed. For example, the resonant circuit may correspond to the frequency of the alternating power received during the initial phase of wireless charging (e.g., a relatively low frequency).

[0106] According to one embodiment, in operation 935, alternating current power received through a resonant circuit including a coil (221), a first capacitor (C1), and a second capacitor (C2) can be supplied to a rectifier circuit (255).

[0107] According to one embodiment, in operation 937, the controller (250) can control the first switch (Q2) using power output from the rectifier circuit (255). For example, the controller (250) can control the first switch (Q2) through the gate driver (230) when it is determined that the rectified voltage (VRECT) output from the rectifier circuit (255) is greater than the voltage specified in the gate driver (230). When the first switch (Q2) is controlled by the controller (250) (or gate driver (230)), the first switch (Q2) may not be controlled by the voltage stored in the third capacitor (Cg). For example, when the first switch (Q2) is normally controlled by the controller (250) (or gate driver (230)), the first switch (Q2) may be controlled in the same way as before.

[0108] FIG. 10 is a flowchart illustrating the operation of a controller of an electronic device controlling a first switch according to one embodiment.

[0109] Referring to FIG. 10, according to one embodiment, in operation 1001, when an electronic device (e.g., wireless power receiving device (103) of FIG. 3, 4, 5, 6a, or 6b) receives power from an external electronic device (e.g., wireless power transmitting device (101) of FIG. 3), the controller (250) can check or monitor the rectified voltage (VRECT) output from the rectification circuit (255).

[0110] According to one embodiment, the controller (250) can determine whether the rectified voltage (VRECT) is greater than (or greater than or equal to) a specified voltage. For example, the specified voltage may represent a reference voltage (e.g., 5V) for the gate driver (230) to normally control the first switch (Q2).

[0111] According to one embodiment, in operation 1003, the controller (250) can control the first switch (Q2) through the gate driver (230) based on determining that the rectified voltage (VRECT) is greater than (or greater than or equal to) a specified voltage. For example, the controller (250) can output a control signal to the gate driver (230) to turn the first switch (Q2) on or off. For example, when the first switch (Q2) is normally controlled by the controller (250) (or the gate driver (230)), the first switch (Q2) may not be controlled by the voltage stored in the third capacitor (Cg).

[0112] According to one embodiment, based on determining that the rectified voltage (VRECT) is not greater than (or less than) a specified voltage, the controller (250) may not output the control signal to the gate driver (230). In this case, the first switch (Q2) may be controlled to the ON state by the voltage stored in the third capacitor (Cg).

[0113] Based on the method described above, the first switch (Q2) can be turned on without control by the controller (250) even if a low-frequency alternating voltage is induced or applied to the coil (221) during the initial stage of wireless charging. For example, a resonant circuit including the coil (221), the first capacitor (C1), and the second capacitor (C2) can be configured based on the first switch (Q2) being turned on even if the power stored in the wireless power receiving device (103) is depleted, and the alternating power received from the wireless power transmitting device (101) can be supplied to the rectifier circuit (255) through the resonant circuit. Through this, the wireless power receiving device (103) can perform normal operation for wireless charging even if the stored power is depleted.

[0114] FIG. 11 is a block diagram of an electronic device (1101) in a network environment (1100) according to various embodiments. Referring to FIG. 11, in the network environment (1100), an electronic device (1101) (e.g., the wireless power receiving device (103) of FIG. 1 or the first electronic device (103) of FIG. 2) may communicate with an electronic device (1102) through a first network (1198) (e.g., a short-range wireless communication network) or may communicate with at least one of an electronic device (1104) or a server (1108) through a second network (1199) (e.g., a long-range wireless communication network). According to one embodiment, the electronic device (1101) may communicate with the electronic device (1104) through the server (1108). According to one embodiment, the electronic device (1101) may include a processor (1120), memory (1130), input module (1150), sound output module (1155), display module (1160), audio module (1170), sensor module (1176), interface (1177), connection terminal (1178), haptic module (1179), camera module (1180), power management module (1188), battery (1189), communication module (1190), subscriber identification module (1196), or antenna module (1197). In some embodiments, at least one of these components (e.g., connection terminal (1178)) may be omitted from the electronic device (1101), or one or more other components may be added. In some embodiments, some of these components (e.g., sensor module (1176), camera module (1180), or antenna module (1197)) may be integrated into a single component (e.g., display module (1160)).

[0115] The processor (1120) can, for example, execute software (e.g., program (1140)) to control at least one other component (e.g., hardware or software component) of the electronic device (1101) connected to the processor (1120) and perform various data processing or operations. According to one embodiment, as at least part of the data processing or operations, the processor (1120) can store commands or data received from other components (e.g., sensor module (1176) or communication module (1190)) in volatile memory (1132), process the commands or data stored in volatile memory (1132), and store the resulting data in non-volatile memory (1134). According to one embodiment, the processor (1120) may include a main processor (1121) (e.g., a central processing unit or an application processor) or an auxiliary processor (1123) that can operate independently or together with it (e.g., a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor). For example, if the electronic device (1101) includes a main processor (1121) and an auxiliary processor (1123), the auxiliary processor (1123) may be configured to use less power than the main processor (1121) or to be specialized for a specified function. The auxiliary processor (1123) may be implemented separately from the main processor (1121) or as part thereof.

[0116] The auxiliary processor (1123) may control at least some of the functions or states associated with at least one component of the electronic device (1101) (e.g., display module (1160), sensor module (1176), or communication module (1190)) on behalf of the main processor (1121) while the main processor (1121) is in an inactive (e.g., sleep) state, or together with the main processor (1121) while the main processor (1121) is in an active (e.g., application execution) state. According to one embodiment, the auxiliary processor (1123) (e.g., image signal processor or communication processor) may be implemented as part of another functionally related component (e.g., camera module (1180) or communication module (1190)). According to one embodiment, the auxiliary processor (1123) (e.g., neural network processing unit) may include a hardware structure specialized for processing an artificial intelligence model. The artificial intelligence model may be generated through machine learning. Such learning may be performed, for example, on the electronic device (1101) itself where the artificial intelligence model is executed, or through a separate server (e.g., server (1108)). The learning algorithm may 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 may include a plurality of artificial neural network layers.An artificial neural network may be 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 the hardware structure, the artificial intelligence model may include a software structure, either additionally or substantially.

[0117] The memory (1130) can store various data used by at least one component of the electronic device (1101) (e.g., processor (1120) or sensor module (1176)). The data may include, for example, software (e.g., program (1140)) and input or output data for related commands. The memory (1130) may include volatile memory (1132) or non-volatile memory (1134).

[0118] The program (1140) may be stored as software in memory (1130) and may include, for example, an operating system (1142), middleware (1144), or an application (1146).

[0119] The input module (1150) can receive commands or data to be used for a component of the electronic device (1101) (e.g., processor (1120)) from outside the electronic device (1101) (e.g., user). The input module (1150) may include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0120] The sound output module (1155) can output a sound signal to the outside of the electronic device (1101). The sound output module (1155) may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as multimedia playback or recording playback. The receiver may be used to receive incoming calls. According to one embodiment, the receiver may be implemented separately from the speaker or as part thereof.

[0121] The display module (1160) can visually provide information to an external (e.g., user) of the electronic device (1101). The display module (1160) may include, for example, a display, a holographic device, or a projector and a control circuit for controlling said device. According to one embodiment, the display module (1160) may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of the force generated by said touch.

[0122] The audio module (1170) can convert sound into an electrical signal or, conversely, convert an electrical signal into sound. According to one embodiment, the audio module (1170) can acquire sound through the input module (1150) or output sound through the sound output module (1155) or an external electronic device (e.g., electronic device (1102)) (e.g., speaker or headphones) connected directly or wirelessly to the electronic device (1101).

[0123] The sensor module (1176) can detect the operating state of the electronic device (1101) (e.g., power or temperature) or the external environmental state (e.g., user state) and generate an electrical signal or data value corresponding to the detected state. According to one embodiment, the sensor module (1176) may include, for example, a gesture sensor, a gyroscope sensor, a barometric pressure sensor, a magnetic sensor, an accelerometer sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biosensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0124] The interface (1177) may support one or more specified protocols that can be used for the electronic device (1101) to be connected directly or wirelessly to an external electronic device (e.g., electronic device (1102)). According to one embodiment, the interface (1177) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

[0125] The connection terminal (1178) may include a connector through which the electronic device (1101) can be physically connected to an external electronic device (e.g., electronic device (1102)). According to one embodiment, the connection terminal (1178) may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0126] The haptic module (1179) can convert an electrical signal into a mechanical stimulus (e.g., vibration or movement) or an electrical stimulus that the user can perceive through tactile or kinesthetic senses. According to one embodiment, the haptic module (1179) may include, for example, a motor, a piezoelectric element, or an electric stimulation device.

[0127] The camera module (1180) can capture still images and video. According to one embodiment, the camera module (1180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0128] The power management module (1188) can manage the power supplied to the electronic device (1101). According to one embodiment, the power management module (1188) can be implemented, for example, as at least part of a power management integrated circuit (PMIC).

[0129] The battery (1189) can supply power to at least one component of the electronic device (1101). According to one embodiment, the battery (1189) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0130] The communication module (1190) can support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between an electronic device (1101) and an external electronic device (e.g., electronic device (1102), electronic device (1104), or server (1108)), and the performance of communication through the established communication channel. The communication module (1190) may include one or more communication processors that operate independently of the processor (1120) (e.g., application processor) and support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module (1190) may include a wireless communication module (1192) (e.g., cellular communication module, short-range wireless communication module, or GNSS (global navigation satellite system) communication module) or a wired communication module (1194) (e.g., LAN (local area network) communication module, or power line communication module). The corresponding communication module among these communication modules can communicate with an external electronic device (1104) via a first network (1198) (e.g., a short-range communication network such as Bluetooth, WiFi (wireless fidelity) direct, or IrDA (infrared data association)) or a second network (1199) (e.g., 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 (1192) can identify or authenticate the electronic device (1101) within a communication network such as the first network (1198) or the second network (1199) using subscriber information (e.g., International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module (1196).

[0131] The wireless communication module (1192) can support 5G networks and next-generation communication technologies following 4G networks, for example, new radio access technology. NR access technology can support high-speed transmission of high-capacity data (enhanced mobile broadband (eMBB)), minimization of terminal power and connection of multiple terminals (massive machine type communications (mMTC)), or high reliability and low latency (ultra-reliable and low-latency communications (URLLC)). The wireless communication module (1192) can support a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate, for example. The wireless communication module (1192) can support various technologies for securing performance in the high-frequency band, such as beamforming, massive MIMO (multiple-input and multiple-output), full-dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large-scale antenna. The wireless communication module (1192) can support various requirements specified in the electronic device (1101), external electronic device (e.g., electronic device (1104)), or network system (e.g., second network (1199)). According to one embodiment, the wireless communication module (1192) can support a Peak data rate (e.g., 20 Gbps or more) for realizing eMBB, loss coverage (e.g., 164 dB or less) for realizing mMTC, or U-plane latency (e.g., downlink (DL) and uplink (UL) each 0.5 ms or less, or round trip 1 ms or less) for realizing URLLC.

[0132] An antenna module (1197) can transmit a signal or power to or from an external source (e.g., an external electronic device). According to one embodiment, the antenna module (1197) may include an antenna comprising a radiator made of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). According to one embodiment, the antenna module (1197) 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 a first network (1198) or a second network (1199), may be selected from the plurality of antennas, for example, by a communication module (1190). A signal or power may be transmitted or received between the communication module (1190) and an external electronic device through the selected at least one antenna. According to some embodiments, in addition to the radiator, other components (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as part of the antenna module (1197).

[0133] According to various embodiments, the antenna module (1197) may form a mmWave antenna module. According to one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent to a first surface (e.g., bottom surface) of the printed circuit board and capable of supporting a specified high frequency band (e.g., mmWave band), and a plurality of antennas (e.g., array antennas) disposed on or adjacent to a second surface (e.g., top surface or side surface) of the printed circuit board and capable of transmitting or receiving a signal of the specified high frequency band.

[0134] At least some of the above components can be connected to each other via a communication method between peripheral devices (e.g., bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)) and exchange signals (e.g., commands or data) with each other.

[0135] According to one embodiment, commands or data may be transmitted or received between the electronic device (1101) and an external electronic device (1104) through a server (1108) connected to a second network (1199). Each of the external electronic devices (1102, or 1104) may be the same or a different type of device as the electronic device (1101). According to one embodiment, all or part of the operations performed on the electronic device (1101) may be performed on one or more of the external electronic devices (1102, 1104, or 1108). For example, if the electronic device (1101) needs to perform a function or service automatically or in response to a request from a user or another device, the electronic device (1101) may request one or more external electronic devices to perform at least part of the function or service instead of performing the function or service itself or additionally. One or more external electronic devices that receive the above request may execute at least part of the requested function or service, or additional function or service related to the request, and transmit the result of the execution to the electronic device (1101). The electronic device (1101) may provide the result as is or additionally processed as at least part of the response to the request. For this purpose, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used. The electronic device (1101) may provide ultra-low latency services using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device (1104) may include an Internet of Things (IoT) device. The server (1108) may be an intelligent server using machine learning and / or neural networks.According to one embodiment, an external electronic device (1104) or server (1108) may be included within the second network (1199). The electronic device (1101) may be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

[0137] According to one embodiment, the electronic device (103) may include a coil (221), a rectifier circuit (255), a matching circuit (220) connected between the coil and the rectifier circuit, and a controller (250), wherein the matching circuit may include at least one diode, a first switch (Q2), a first capacitor (C1), a second capacitor (C2) connected in parallel with the first capacitor by the first switch, and a third capacitor (Cg). According to one embodiment, when the controller is powered off or inactive, the first switch may be turned on by energy charged in the third capacitor based on an alternating voltage induced in the coil from an external electronic device (101) to form a first resonant circuit including the first capacitor, the second capacitor, and the coil, wherein the first resonant circuit may be configured to receive alternating power of a first frequency from the external electronic device. According to one embodiment, the controller may be configured to control the first switch to an off state to form a second resonant circuit including the first capacitor and the coil when the controller is powered on or in an active state, wherein the second resonant circuit may be configured to receive alternating current power of a second frequency.

[0138] According to one embodiment, the controller may be configured to control the first switch to the ON state to form the first resonant circuit to receive the alternating current power of the first frequency when the controller is powered on or in the active state.

[0139] According to one embodiment, the matching circuit may include a first diode (D1) connected to one end of the coil, a first resistor (Rg) connected to one point between one end of the first diode and the gate of the first switch and the gate driver (230) for controlling the first switch, a third capacitor (Cg) disposed between the gate of the first switch and the source of the first switch, and a Zener diode (Dg) disposed between the gate of the first switch and the source of the first switch and connected in parallel with the third capacitor (Cg).

[0140] According to one embodiment, the first switch may be turned on based on the first capacitor voltage corresponding to the energy charged in the third capacitor by the alternating voltage being applied to the gate of the first switch. According to one embodiment, a resonance time constant by the coil, the first capacitor, and the second capacitor may be determined based on the first switch being turned on.

[0141] According to one embodiment, the value obtained by subtracting the second value, which is the product of the leakage current between the gate and the source of the first switch and the period of the alternating voltage divided by the capacitance of the third capacitor, from the first value corresponding to the peak of the alternating voltage, may be greater than the threshold voltage of the gate of the first switch.

[0142] According to one embodiment, when the first switch is controlled by the controller, the supply of the first capacitor voltage corresponding to the energy charged in the third capacitor by the first resistor to the first switch may be blocked.

[0143] According to one embodiment, the matching circuit may further include a low-pass filter disposed between one end of the coil and the first diode. According to one embodiment, the first switch may be turned on based on an alternating voltage filtered through the low-pass filter.

[0144] According to one embodiment, the matching circuit may include a second diode (D2) connected to one end of the coil, a first diode (D1) connected to the second diode, a fourth capacitor (Cstart) connected in parallel between the first diode and the second diode, a first resistor (Rg) connected at a point between one end of the first diode and the gate of the first switch and the gate driver (230) for controlling the first switch, the third capacitor (Cg) disposed between the gate of the first switch and the source of the first switch, and a Zener diode (Dg) disposed between the gate of the first switch and the source of the first switch and connected in parallel with the third capacitor (Cg).

[0145] According to one embodiment, the energy of the first capacitor voltage can be charged to the third capacitor based on the second capacitor voltage corresponding to the energy charged to the fourth capacitor by the peak of the alternating voltage. According to one embodiment, the first switch can be turned on based on the first capacitor voltage being applied to the gate of the first switch. According to one embodiment, the resonance time constant by the coil, the first capacitor, and the second capacitor can be determined based on the first switch being turned on.

[0146] According to one embodiment, the value obtained by subtracting the third value, which is the product of the leakage current between the gate and the source of the first switch and the period of the alternating voltage, from the first value corresponding to the peak of the alternating voltage, and the capacitance obtained by adding the capacitance of the third capacitor and the capacitance of the fourth capacitor, may be greater than the threshold voltage of the gate of the first switch.

[0147] According to one embodiment, when the first switch is controlled by the controller, the supply of the first capacitor voltage corresponding to the energy charged in the third capacitor by the first resistor to the first switch may be blocked.

[0148] According to one embodiment, the matching circuit may further include a low-pass filter disposed between the one end of the coil and the second diode. According to one embodiment, the first switch may be turned on based on an alternating voltage filtered through the low-pass filter.

[0149] According to one embodiment, when the controller is powered off as a result of the battery included in the electronic device being completely discharged, a part of the matching circuit including the third capacitor may be configured to turn on the first switch using alternating current power received through the coil.

[0150] According to one embodiment, in a method of operation of an electronic device (103), the electronic device (103) may include a coil (221), a rectifier circuit (255), a matching circuit (220) connected between the coil and the rectifier circuit, and a controller (250), wherein the matching circuit may include at least one diode, a first switch (Q2), a first capacitor (C1), a second capacitor (C2) connected in parallel with the first capacitor by the first switch, and a third capacitor (Cg). According to one embodiment, the method of operation of the electronic device may include turning on the first switch by energy charged in the third capacitor based on an alternating voltage induced in the coil from an external electronic device (101) to form a first resonant circuit including the first capacitor, the second capacitor, and the coil when the controller included in the electronic device is powered off or inactive, wherein the first resonant circuit may be configured to receive alternating power of a first frequency from the external electronic device. According to one embodiment, the method of operation of the electronic device may include the operation of controlling the first switch to an off state by the controller to form a second resonant circuit including the first capacitor and the coil when the controller is powered on or in an active state, wherein the second resonant circuit may be configured to receive alternating current power of a second frequency.

[0151] According to one embodiment, the method of operating the electronic device may further include the operation of controlling the first switch to an ON state to form the first resonant circuit to receive the alternating current power of the first frequency when the controller is powered on or in the active state.

[0152] According to one embodiment, the method of operating the electronic device may further include the operation of turning on the first switch based on the first capacitor voltage corresponding to the energy charged in the third capacitor by the alternating voltage being applied to the gate of the first switch. According to one embodiment, a resonance time constant by the coil, the first capacitor, and the second capacitor may be determined based on the first switch being turned on.

[0153] According to one embodiment, the operation of controlling the first switch to the ON state may further include the operation of turning on the first switch based on an AC voltage filtered through a low-pass filter disposed between the one end of the coil and the at least one diode.

[0154] According to one embodiment, the method of operation of the electronic device may further include an operation of charging the energy of the first capacitor voltage to the third capacitor based on the second capacitor voltage corresponding to the energy charged to the fourth capacitor by the peak of the alternating voltage. According to one embodiment, the method of operation of the electronic device may further include an operation of controlling the first switch to an ON state based on the first capacitor voltage being applied to the gate of the first switch. According to one embodiment, a resonance time constant by the coil, the first capacitor, and the second capacitor may be determined based on controlling the first switch to an ON state.

[0155] According to one embodiment, when the first switch is controlled by the controller, the supply of a first capacitor voltage corresponding to the energy charged in the third capacitor to the first switch may be blocked by a first resistor connected at a point between the gate of the first switch and the gate driver.

[0156] According to one embodiment, when the controller is powered off as a result of the battery included in the electronic device being completely discharged, a part of the matching circuit including the third capacitor may be configured to turn on the first switch using alternating current power received through the coil.

[0158] The electronic device according to the various embodiments disclosed in this document may be of various forms. The electronic device may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a consumer electronics device. The electronic device according to the embodiments of this document is not limited to the devices described above.

[0159] The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said 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 said items unless the relevant context clearly indicates otherwise. In this document, phrases such as "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" may each include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used simply to distinguish said components from other said components and do not limit said components in any other aspect (e.g., importance or order). Where any (e.g., 1st) component is referred to as “coupled” or “connected” to another (e.g., 2nd) component, with or without the terms “functionally” or “communicationly,” it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.

[0160] The term “module” as used in the 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, for example. A module may be a component formed integrally, or a minimum unit of said component or a part thereof 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).

[0161] Various embodiments of the present document may be implemented as software (e.g., program (1240)) comprising one or more instructions stored in a storage medium (e.g., internal memory (1236) or external memory (1238)) readable by a machine (e.g., electronic device (1201)). For example, a processor (e.g., processor (1220)) of the machine (e.g., electronic device (1201)) may call at least one of the one or more instructions stored from the storage medium and execute it. This enables the machine to be operated 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 that can be executed by an interpreter. The storage medium readable by the machine may be provided in the form of a non-transitory storage medium. Here, 'non-temporary' simply means that the storage medium is a tangible device and does not contain a signal (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily.

[0162] According to one embodiment, the method according to the various embodiments disclosed herein may be provided by being included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily created on a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0163] According to various embodiments, each component (e.g., module or program) of the components described above may include a singular or multiple entities, and some of the multiple entities may be separated and placed in other components. According to various embodiments, one or more of the components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Generally or additionally, multiple components (e.g., module or program) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the multiple components in the same or similar manner as those performed by the corresponding component among the multiple components prior to integration. According to various embodiments, operations performed by the module, program, or other components 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. Explanation of the symbols

[0164] 101: External electronic device (or wireless power transmitter) 103: Electronic device (or wireless power receiving device) 230: Gate Driver 250: Controller 255: Rectifier circuit

Claims

Claim 1 In an electronic device (103), a coil (221); a rectifier circuit (255); a matching circuit (220) connected between the coil and the rectifier circuit, wherein the matching circuit comprises at least one diode, a first switch (Q2), a first capacitor (C1), a second capacitor (C2) connected in parallel with the first capacitor by the first switch, and a third capacitor (Cg), and a controller (250), wherein when the controller is powered off or inactive, the first switch is turned on by energy charged in the third capacitor based on an alternating voltage induced in the coil from an external electronic device (101) to form a first resonant circuit comprising the first capacitor, the second capacitor, and the coil, wherein the first resonant circuit is configured to receive alternating power of a first frequency from the external electronic device, and when the controller is powered on or active, the controller turns off the first switch to form a second resonant circuit comprising the first capacitor and the coil. An electronic device configured to be controlled in a state, wherein the second resonant circuit is configured to receive alternating current power of a second frequency. Claim 2 In claim 1, the controller is an electronic device configured to control the first switch to the ON state to form the first resonant circuit to receive the alternating current power of the first frequency when the controller is powered on or in the active state. Claim 3 An electronic device according to any one of claims 1 to 2, wherein the matching circuit comprises: a first diode (D1) connected to one end of the coil; a first resistor (Rg) connected to one point between one end of the first diode and the gate of the first switch and the gate driver (230) for controlling the first switch; a third capacitor (Cg) disposed between the gate of the first switch and the source of the first switch; and a Zener diode (Dg) disposed between the gate of the first switch and the source of the first switch and connected in parallel with the third capacitor (Cg). Claim 4 An electronic device according to any one of claims 1 to 3, wherein the first switch is turned on based on the first capacitor voltage corresponding to the energy charged in the third capacitor by the alternating current voltage being applied to the gate of the first switch, and the resonance time constant by the coil, the first capacitor, and the second capacitor is determined based on the first switch being turned on. Claim 5 An electronic device according to any one of claims 1 to 4, characterized in that the value obtained by subtracting the second value, which is the product of the leakage current between the gate and the source of the first switch and the period of the alternating voltage divided by the capacitance of the third capacitor, from the first value corresponding to the peak of the alternating voltage is greater than the threshold voltage of the gate of the first switch. Claim 6 An electronic device according to any one of claims 1 to 5, wherein when the first switch is controlled by the controller, the supply of a first capacitor voltage corresponding to the energy charged in the third capacitor by the first resistor to the first switch is blocked. Claim 7 An electronic device according to any one of claims 1 to 6, wherein the matching circuit further comprises a low-pass filter disposed between the one end of the coil and the first diode, and the first switch is turned on based on an alternating voltage filtered through the low-pass filter. Claim 8 An electronic device according to any one of claims 1 to 7, wherein the matching circuit comprises: a second diode (D2) connected to one end of the coil; a first diode (D1) connected to the second diode; a fourth capacitor (Cstart) connected in parallel between the first diode and the second diode; a first resistor (Rg) connected at a point between one end of the first diode and the gate of the first switch and the gate driver (230) for controlling the first switch; the third capacitor (Cg) disposed between the gate of the first switch and the source of the first switch; and a Zener diode (Dg) disposed between the gate of the first switch and the source of the first switch and connected in parallel with the third capacitor (Cg). Claim 9 An electronic device according to any one of claims 1 to 8, wherein the energy of the first capacitor voltage is charged in the third capacitor based on the second capacitor voltage corresponding to the energy charged in the fourth capacitor by the peak of the alternating voltage, the first switch is turned on based on the first capacitor voltage being applied to the gate of the first switch, and the resonance time constant is determined by the coil, the first capacitor, and the second capacitor based on the first switch being turned on. Claim 10 An electronic device according to any one of claims 1 to 9, characterized in that the value obtained by subtracting the third value, which is the product of the leakage current between the gate and the source of the first switch and the period of the alternating voltage divided by the capacitance of the third capacitor and the capacitance of the fourth capacitor, from the first value corresponding to the peak of the alternating voltage is greater than the threshold voltage of the gate of the first switch. Claim 11 An electronic device according to any one of claims 1 to 10, wherein when the first switch is controlled by the controller, the supply of a first capacitor voltage corresponding to the energy charged in the third capacitor by the first resistor to the first switch is blocked. Claim 12 An electronic device according to any one of claims 1 to 11, wherein the matching circuit further comprises a low-pass filter disposed between the one end of the coil and the second diode, and the first switch is turned on based on an alternating voltage filtered through the low-pass filter. Claim 13 An electronic device according to any one of claims 1 to 12, wherein when the controller is powered off as a result of the battery included in the electronic device being completely discharged, a part of the matching circuit including the third capacitor is configured to turn on the first switch using alternating current power received through the coil. Claim 14 In a method of operation of an electronic device (103), the electronic device comprises a coil (221), a rectifier circuit (255), a matching circuit (220) connected between the coil and the rectifier circuit, wherein the matching circuit comprises at least one diode, a first switch (Q2), a first capacitor (C1), a second capacitor (C2) connected in parallel with the first capacitor by the first switch, and a third capacitor (Cg); and when a controller included in the electronic device is powered off or in an inactive state, the operation of turning on the first switch by energy charged in the third capacitor based on an alternating voltage induced in the coil from an external electronic device (101) to form a first resonant circuit including the first capacitor, the second capacitor, and the coil, wherein the first resonant circuit is configured to receive alternating power of a first frequency from the external electronic device; A method of operation of an electronic device comprising, when the controller is powered on or in an active state, controlling the first switch to an off state by the controller to form a second resonant circuit including the first capacitor and the coil, wherein the second resonant circuit is configured to receive alternating current power of a second frequency. Claim 15 A method of operation of an electronic device according to claim 14, further comprising the operation of controlling the first switch to the ON state by the controller to form the first resonant circuit to receive the alternating current power of the first frequency when the controller is powered on or in the active state. Claim 16 A method of operation of an electronic device according to any one of claims 14 to 15, further comprising the operation of turning on the first switch based on the first capacitor voltage corresponding to the energy charged in the third capacitor by the alternating current voltage being applied to the gate of the first switch, and a resonance time constant by the coil, the first capacitor, and the second capacitor being determined based on the first switch being turned on. Claim 17 A method of operation of an electronic device according to any one of claims 14 to 16, wherein the operation of controlling the first switch to an ON state further comprises the operation of turning on the first switch based on an alternating current voltage filtered through a low-pass filter disposed between the one end of the coil and the at least one diode. Claim 18 A method of operation of an electronic device according to any one of claims 14 to 17, further comprising: an operation of charging the energy of the first capacitor voltage into the third capacitor based on the second capacitor voltage corresponding to the energy charged in the fourth capacitor by the peak of the alternating voltage; and an operation of controlling the first switch to an ON state based on the first capacitor voltage being applied to the gate of the first switch, wherein a resonance time constant by the coil, the first capacitor, and the second capacitor is determined based on controlling the first switch to an ON state. Claim 19 A method of operation of an electronic device according to any one of claims 14 to 18, wherein when the first switch is controlled by the controller, the supply of a first capacitor voltage corresponding to the energy charged in the third capacitor to the first switch is blocked by a first resistor connected at a point between the gate of the first switch and the gate driver. Claim 20 A method of operation of an electronic device according to any one of claims 14 to 19, wherein when the controller is powered off as a result of the battery included in the electronic device being completely discharged, a part of the matching circuit including the third capacitor is configured to turn on the first switch using alternating current power received through the coil.

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