Electronic device and method for wireless charging supporting multiple frequencies, and non-transitory storage medium

Abstract

The present disclosure relates to an electronic device and method for wireless charging supporting multiple frequencies, and a non-transitory storage medium. The electronic device, according to one embodiment, may comprise: a coil configured to wirelessly receive power from an external electronic device; a resonance circuit comprising a first capacitor; a rectifier circuit connected to the resonance circuit; a communication circuit; and a control circuit electrically connected to the rectifier circuit, the resonance circuit, and the communication circuit. According to one embodiment, the rectifier circuit comprises: a plurality of switches; and a plurality of switch driver circuits electrically connected to one of the plurality of switches, respectively, wherein at least two switch driver circuits among the plurality of switch driver circuits may comprise at least one delayer. According to one embodiment, the control circuit may be configured to: check a first operating frequency on the basis of operating frequency-related information received through the communication circuit; control so as to drive the at least one delayer on the basis of the first operating frequency; adjust the switching timing of at least two switches among the plurality of switches by a specified delay value of the at least one delayer; and control the switching of the plurality of switches on the basis of the adjusted switching timing. Other embodiments are also possible.

Description

Electronic device, method and non-transitory storage medium for wireless charging supporting multiple frequencies

[0001] The present disclosure relates to an electronic device and method for wireless charging supporting multiple frequencies.

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

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

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

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

[0006] Qi-based wireless charging operates within a limited frequency range of 110 kHz to 145 kHz. In addition to the 110-145 kHz operating frequency, higher frequencies (e.g., 350 kHz) may be used. While the resonant capacitor is tuned to the Qi wireless charging operating frequency, operating at a higher frequency (e.g., 350 kHz) may reduce wireless charging efficiency. To address this, additional circuitry may be required in the Rx section to allow for frequency-dependent switching of the resonant capacitor to support both the 110-145 kHz and 350 kHz bands.

[0007] To support multiple operating frequencies, a circuit that changes the resonant capacitor using a switch is required, which increases the printed circuit board (PCB) area and material cost. In particular, when the power of wireless charging is high, a MOSFET (metal oxide semiconductor field effect transistor) with a large BV may be required because the voltage applied to the capacitor is large. However, in electronic devices where PCB area is critical (e.g., the size of the PCB area and / or the amount of free space in the PCB area are limited), a circuit that changes the resonant capacitor may be difficult to use.

[0008] The present disclosure provides an electronic device, method, and non-transitory storage medium for efficiently performing wireless charging when an operating frequency is changed by utilizing a switching operation of a rectifier circuit without including an additional circuit for changing a resonant capacitor in a resonant circuit for receiving wireless power, and without changing the resonant capacitor.

[0009] According to one embodiment of the present disclosure, an electronic device may include a coil configured to wirelessly receive power from an external electronic device, a resonant circuit including a first capacitor, a rectifier circuit connected to the resonant circuit, a communication circuit, and a control circuit electrically connected to the rectifier circuit, the resonant circuit, and the communication circuit.

[0010] According to one embodiment, the rectifier circuit includes a plurality of switches (e.g., S1, S2, S3, S4), a plurality of switch driver circuits each electrically connected to one of the plurality of switches, and at least two of the plurality of switch driver circuits may include at least one delay unit.

[0011] According to one embodiment, the control circuit may be configured to determine the first operating frequency based on information related to the operating frequency received from the external electronic device.

[0012] According to one embodiment, the control circuit may be configured to control the driving of the at least one delay based on the first operating frequency, and to adjust the switching timing of at least two switches among the plurality of switches by a designated delay value of the at least one delay.

[0013] According to one embodiment, the control circuit may be configured to control the switching operation of the plurality of switches without operating the at least one delay unit based on determining that the operating frequency has not changed.

[0014] According to one embodiment, a method of operating in an electronic device may include an operation of identifying a first operating frequency based on information related to an operating frequency received from an external electronic device.

[0015] Based on the first operating frequency, the method may include driving at least one delay circuit included in the rectifier circuit of the electronic device.

[0016] According to one embodiment, the method may include adjusting the switching timing of at least two of the plurality of switches included in the rectifier circuit by a delay value of the at least one delay unit.

[0017] According to one embodiment, the method may include an operation of performing switching of the plurality of switches based on the adjusted switching timing.

[0018] In one embodiment, each of the plurality of switches may be electrically connected to one of the plurality of switch driver circuits included in the rectifier circuit. In one embodiment, at least two of the plurality of switch driver circuits may be electrically connected to the at least one delay unit.

[0019] According to one embodiment, a non-transitory storage medium storing a program may include instructions that, when executed by a processor of an electronic device, cause the electronic device to perform an operation of confirming a first operating frequency based on information related to an operating frequency received from an external electronic device, an operation of operating at least one delay unit included in a rectifier circuit of the electronic device based on the first operating frequency, an operation of adjusting a switching timing of at least two switches among a plurality of switches included in the rectifier circuit with a designated delay value, and an operation of performing switching of the plurality of switches based on the adjusted switching timing. According to one embodiment, each of the plurality of switches may be electrically connected to one of the plurality of switch driver circuits included in the rectifier circuit, and at least two of the plurality of switch driver circuits may include the at least one delay unit.

[0020] FIG. 1 is a block diagram of an electronic device within a network environment according to various embodiments.

[0021] FIGS. 2A and 2B are drawings showing an external electronic device for transmitting wireless power and an electronic device for receiving wireless power according to one embodiment.

[0022] FIG. 3 is a diagram illustrating an example configuration of an electronic device according to one embodiment.

[0023] FIG. 4 is a diagram for comparing an operating waveform of an electronic device according to one embodiment and a conventional operating waveform.

[0024] FIG. 5 is a drawing showing an example of an operating method in an electronic device according to one embodiment.

[0025] In connection with the description of the drawings, the same or similar reference numerals may be used for identical or similar components.

[0026] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings so that those skilled in the art can easily implement the present disclosure. However, the present disclosure may be implemented in various different forms and is not limited to the embodiments described herein. In connection with the description of the drawings, the same or similar reference numerals may be used for the same or similar components. In addition, in the drawings and related descriptions, descriptions of well-known functions and configurations may be omitted for clarity and conciseness. The term "user" used in the embodiments of the present disclosure may refer to a person using an electronic device or a device (e.g., an artificial intelligence electronic device) using an electronic device.

[0027] FIG. 1 is a block diagram of an electronic device (101) within a network environment (100) according to various embodiments. Referring to FIG. 1, in the network environment (100), the electronic device (101) may communicate with an electronic device (102) via a first network (198) (e.g., a short-range wireless communication network), or may communicate with at least one of an electronic device (104) or a server (108) via a second network (199) (e.g., a long-range wireless communication network). According to one embodiment, the electronic device (101) may communicate with the electronic device (104) via the server (108). According to one embodiment, the electronic device (101) may include a processor (120), a memory (130), an input module (150), an audio output module (155), a display module (160), an audio module (170), a sensor module (176), an interface (177), a connection terminal (178), a haptic module (179), a camera module (180), a power management module (188), a battery (189), a communication module (190), a subscriber identification module (196), or an antenna module (197). In some embodiments, the electronic device (101) may omit at least one of these components (e.g., the connection terminal (178)), or may have one or more other components added. In some embodiments, some of these components (e.g., the sensor module (176), the camera module (180), or the antenna module (197)) may be integrated into one component (e.g., the display module (160)).

[0028] The processor (120) may, for example, execute software (e.g., a program (140)) to control at least one other component (e.g., a hardware or software component) of the electronic device (101) connected to the processor (120) and perform various data processing or calculations. According to one embodiment, as at least a part of the data processing or calculations, the processor (120) may store commands or data received from other components (e.g., a sensor module (176) or a communication module (190)) in a volatile memory (132), process the commands or data stored in the volatile memory (132), and store result data in a non-volatile memory (134). According to one embodiment, the processor (120) may include a main processor (121) (e.g., a central processing unit or an application processor) or a secondary processor (123) (e.g., a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor)) that can operate independently or together therewith. For example, if the electronic device (101) includes a main processor (121) and a secondary processor (123), the secondary processor (123) may be configured to use less power than the main processor (121) or to be specialized for a specified function. The secondary processor (123) may be implemented separately from the main processor (121) or as a part thereof.

[0029] The auxiliary processor (123) may control at least a portion of functions or states associated with at least one component (e.g., a display module (160), a sensor module (176), or a communication module (190)) of the electronic device (101), for example, on behalf of the main processor (121) while the main processor (121) is in an inactive (e.g., sleep) state, or together with the main processor (121) while the main processor (121) is in an active (e.g., application execution) state. In one embodiment, the auxiliary processor (123) (e.g., an image signal processor or a communication processor) may be implemented as a part of another functionally related component (e.g., a camera module (180) or a communication module (190)). In one embodiment, the auxiliary processor (123) (e.g., a neural network processing unit) may include a hardware structure specialized for processing artificial intelligence models. The artificial intelligence models may be generated through machine learning. This learning can be performed, for example, on the electronic device (101) itself where the artificial intelligence model is executed, or can be performed through a separate server (e.g., server (108)). The learning algorithm can include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but is not limited to the examples described above. The artificial intelligence model can include multiple artificial neural network layers.The artificial neural network may be one of a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), a deep Q-network, or a combination of two or more of the above, but is not limited to the examples described above. In addition to, or alternatively to, a hardware structure, an artificial intelligence model may include a software structure.

[0030] The memory (130) can store various data used by at least one component (e.g., processor (120) or sensor module (176)) of the electronic device (101). The data can include, for example, software (e.g., program (140)) and input data or output data for commands related thereto. The memory (130) can include volatile memory (132) or non-volatile memory (134).

[0031] The program (140) may be stored as software in the memory (130) and may include, for example, an operating system (142), middleware (144), or an application (146).

[0032] The input module (150) can receive commands or data to be used in a component of the electronic device (101) (e.g., a processor (120)) from an external source (e.g., a user) of the electronic device (101). The input module (150) can include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0033] The audio output module (155) can output audio signals to the outside of the electronic device (101). The audio output module (155) can include, for example, a speaker or a receiver. The speaker can be used for general purposes, such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. In one embodiment, the receiver can be implemented separately from the speaker or as part of the speaker.

[0034] The display module (160) can visually provide information to an external party (e.g., a user) of the electronic device (101). The display module (160) may include, for example, a display, a holographic device, or a projector and a control circuit for controlling the device. In one embodiment, the display module (160) may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of a force generated by the touch.

[0035] The audio module (170) can convert sound into an electrical signal, or vice versa, convert an electrical signal into sound. According to one embodiment, the audio module (170) can acquire sound through the input module (150), output sound through the sound output module (155), or an external electronic device (e.g., electronic device (102)) (e.g., speaker or headphone) directly or wirelessly connected to the electronic device (101).

[0036] The sensor module (176) can detect the operating status (e.g., power or temperature) of the electronic device (101) or the external environmental status (e.g., user status) and generate an electrical signal or data value corresponding to the detected status. According to one embodiment, the sensor module (176) can include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0037] The interface (177) may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device (101) with an external electronic device (e.g., the electronic device (102)). In one embodiment, the interface (177) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

[0038] The connection terminal (178) may include a connector through which the electronic device (101) may be physically connected to an external electronic device (e.g., electronic device (102)). According to one embodiment, the connection terminal (178) may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0039] The haptic module (179) can convert electrical signals into mechanical stimuli (e.g., vibration or movement) or electrical stimuli that a user can perceive through tactile or kinesthetic sensations. According to one embodiment, the haptic module (179) can include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

[0040] The camera module (180) can capture still images and moving images. According to one embodiment, the camera module (180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0041] The power management module (188) can manage power supplied to the electronic device (101). According to one embodiment, the power management module (188) can be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

[0042] A battery (189) may power at least one component of the electronic device (101). In one embodiment, the battery (189) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0043] The communication module (190) may support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device (101) and an external electronic device (e.g., electronic device (102), electronic device (104), or server (108)), and the performance of communication through the established communication channel. The communication module (190) may operate independently from the processor (120) (e.g., application processor) and may include one or more communication processors that support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module (190) may include a wireless communication module (192) (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (194) (e.g., a local area network (LAN) communication module, or a power line communication module). Among these communication modules, the corresponding communication module can communicate with an external electronic device (104) via a first network (198) (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (199) (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules can 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 (192) can verify or authenticate the electronic device (101) within a communication network such as the first network (198) or the second network (199) by using subscriber information (e.g., an international mobile subscriber identity (IMSI)) stored in the subscriber identification module (196).

[0044] The wireless communication module (192) can support 5G networks and next-generation communication technologies following the 4G network, such as NR access technology (new radio access technology). The NR access technology can support high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and connection of multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency communications)). The wireless communication module (192) can support, for example, a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate. The wireless communication module (192) can support various technologies for securing performance in a high-frequency band, such as beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module (192) can support various requirements specified in the electronic device (101), an external electronic device (e.g., the electronic device (104)), or a network system (e.g., the second network (199)). According to one embodiment, the wireless communication module (192) can support a peak data rate (e.g., 20 Gbps or more) for realizing 1eMBB, a loss coverage (e.g., 164 dB or less) for realizing mMTC, or a U-plane latency (e.g., 0.5 ms or less for downlink (DL) and uplink (UL), or 1 ms or less for round trip) for realizing URLLC.

[0045] The antenna module (197) can transmit or receive signals or power to or from an external device (e.g., an external electronic device). In one embodiment, the antenna module (197) may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). In one embodiment, the antenna module (197) may include a plurality of antennas (e.g., an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network, such as the first network (198) or the second network (199), may be selected from the plurality of antennas, for example, by the communication module (190). A signal or power may be transmitted or received between the communication module (190) and an external electronic device via the at least one selected antenna. In some embodiments, in addition to the radiator, another component (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as a part of the antenna module (197).

[0046] According to various embodiments, the antenna module (197) may form a mmWave antenna module. In one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent a first side (e.g., a bottom side) of the printed circuit board and capable of supporting a designated high-frequency band (e.g., a mmWave band), and a plurality of antennas (e.g., an array antenna) disposed on or adjacent a second side (e.g., a top side or a side) of the printed circuit board and capable of transmitting or receiving signals in the designated high-frequency band.

[0047] At least some of the above components can be interconnected and exchange signals (e.g., commands or data) with each other via a communication method between peripheral devices (e.g., a bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)).

[0048] According to one embodiment, commands or data may be transmitted or received between the electronic device (101) and an external electronic device (104) via a server (108) connected to a second network (199). Each of the external electronic devices (102 or 104) may be the same or a different type of device as the electronic device (101). According to one embodiment, all or part of the operations executed in the electronic device (101) may be executed in one or more of the external electronic devices (102, 104, or 108). For example, when the electronic device (101) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (101) may, instead of or in addition to executing the function or service itself, request one or more external electronic devices to perform the function or at least a part of the service. One or more external electronic devices that receive the request may execute at least a portion of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device (101). The electronic device (101) may process the result as is or additionally and provide it as at least a portion of a response to the request. For this purpose, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device (101) may provide an ultra-low latency service by using distributed computing or mobile edge computing, for example. In another embodiment, the external electronic device (104) may include an Internet of Things (IoT) device. The server (108) may be an intelligent server utilizing machine learning and / or a neural network. According to one embodiment, the external electronic device (104) or the server (108) may be included in the second network (199).The electronic device (101) can be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

[0049] Hereinafter, in the description according to an embodiment with reference to FIGS. 2A, 2B, and 3, a device for transmitting wireless power (e.g., a wireless power transmitting device) may be referred to as an external electronic device, and a device for receiving wireless power (e.g., a wireless power receiving device) may be referred to as an electronic device. FIGS. 2A and 2B are drawings showing an external electronic device and an electronic device for transmitting wireless power according to an embodiment.

[0050] Referring to FIGS. 2A and 2B , an external electronic device (201) for transmitting wireless power (e.g., the electronic device (102) of FIG. 1 ) according to one embodiment may wirelessly transmit power to an electronic device (101) for receiving wireless power (e.g., the electronic device (101) of FIG. 1 ). For example, the external electronic device (201) may receive information from the electronic device (101). In one example, the external electronic device (201) may transmit power in an inductive manner. When the external electronic device (201) transmits or attempts to transmit power in an inductive manner, the external electronic device (201) may include, for example, at least one of a power source, a DC-DC conversion circuit (e.g., a DC / DC converter), a DC-AC conversion circuit (e.g., an inverter), an amplifier circuit, an impedance matching circuit, at least one capacitor, at least one coil, or a communication modulation circuit. For example, at least one capacitor may form a resonant circuit together with at least one coil. For example, the external electronic device (201) may implement at least a part of the method defined in the Qi standard of the wireless power consortium (WPC). The external electronic device (201) may include a coil that can generate an induced magnetic field when a current flows through it according to an inductive method. The process of the external electronic device (201) generating an induced magnetic field may be expressed as the external electronic device (201) wirelessly transmitting power. In addition, in the coil of the electronic device (101), an induced electromotive force (e.g., current, voltage, and / or power) may be generated by a magnetic field generated in the surroundings according to a resonant or inductive method. The process of generating an induced electromotive force through the coil may be expressed as the electronic device (101) wirelessly receiving power.

[0051] According to one embodiment, an external electronic device (201) can communicate with an electronic device (101). For example, the external electronic device (201) can communicate with the electronic device (101) according to an in-band method. The external electronic device (201) can modulate data to be transmitted, for example, according to a frequency shift keying (FSK) modulation method, and the electronic device (101) can provide information by modulating according to an amplitude shift keying (ASK) modulation method. The external electronic device (201) can check information provided by the electronic device (101) based on the amplitude of the current and / or voltage applied to the coil. Although the description of FIG. 2 illustrates that the electronic device (101) directly transmits information to the external electronic device (201), this is merely for ease of understanding, and those skilled in the art will understand that the electronic device (101) controls the on / off of at least one switch therein. An operation of performing modulation based on the ASK modulation method and / or the FSK modulation method can be understood as an operation of transmitting data (or packets) according to an in-band communication method, and an operation of performing demodulation based on the ASK demodulation method and / or the FSK demodulation method can be understood as an operation of receiving data (or packets) according to an in-band communication method.

[0052] In the present disclosure, when an external electronic device (201) or an electronic device (101) performs a specific operation, it may mean that various hardware included in the external electronic device (201) or the electronic device (101), for example, a controller 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 the specific operation. Alternatively, when the external electronic device (201) or the electronic device (101) performs the specific operation, it may mean that the controller controls other hardware to perform the specific operation. Alternatively, when the external electronic device (201) or the electronic device (101) performs the specific operation, it may mean that at least one instruction for performing the specific operation stored in a storage circuit (e.g., a memory) of the external electronic device (201) or the electronic device (101) is executed, thereby causing the controller or other hardware to perform the specific operation.

[0053] In the present disclosure, the electronic device (101) may be a foldable or flip-type electronic device in which a portion of the housing is folded, and may include a hinge structure made of metal arranged in a portion where a portion of the housing is folded.

[0054] According to one embodiment, an external electronic device (201) may perform ping, identification and configuration, negotiation for FOD determination, and power transfer operations to transmit power to an electronic device (101) according to a method defined in the Qi standard of the wireless power consortium (WPC).

[0055] An external electronic device (201) according to one embodiment may include at least one of a power source (211), an inverter (218) including a plurality of switches (Q1, Q2, Q3, Q4) (the number of switches shown in FIG. 2A should not be considered limiting), a capacitor (212), a coil (213), a demodulation circuit (214), a controller (215), or a DC / DC converter (217). According to one embodiment, power provided by the power source (211) may be provided to the DC / DC converter (217). The power source (211) may include an interface for connecting to an external travel adapter (TA), at least one of a battery (not shown), a charger (not shown), or a power management integrated circuit (PMIC) (not shown) of the external electronic device (201). The power source (211) may provide, for example, direct current power to the DC / DC converter (217), but there is no limitation on the form of power provided. The DC / DC converter (217) can convert the voltage of the supplied power and apply it to the inverter (218). The DC / DC converter (217) can change the voltage of the supplied DC power and provide the DC power having the changed voltage (or, driving voltage (VDD)) to the inverter (218). The DC / DC converter (217) can perform, for example, buck converting and / or boost converting, and can be implemented as, for example, a 3-level converter, but those skilled in the art will understand that there is no limitation on the type.

[0056] An inverter (218) according to one embodiment can output AC power using a driving voltage (VDD) provided from a DC / DC converter (217). A plurality of switches (Q1, Q2, Q3, Q4) can form, for example, a full bridge circuit, but there is no limitation on the number of switches or the type of bridge circuit. For example, when a full bridge circuit is formed, one end of a coil (213) can be connected to a connection point between the switches (Q1, Q2) via a capacitor (212), and the other end of the coil (213) can be connected to a connection point between the switches (Q3, Q4). The plurality of switches (Q1, Q2, Q3, Q4) can be controlled to be in an on state or an off state. For example, in order to generate AC power, the controller (215) can control the first switch (Q1) and the third switch (Q3) to be in an on state during a first period while controlling the second switch (Q2) and the fourth switch (Q4) to be in an off state, and can control the first switch (Q1) and the third switch (Q3) to be in an off state during a second period while controlling the second switch (Q2) and the fourth switch (Q4) to be in an on state, and can repeatedly perform the above-described control operations. The controller (215) can provide control signals (Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV) for generating the above-described AC power to the plurality of switches (Q1, Q2, Q3, Q4). Here, not only outputting the control signal but also refraining from outputting the control signal can be referred to as control of the controller (215). That is, outputting a control signal is an example of an operation of the controller (215), and not outputting a control signal (e.g., maintaining output, not outputting, etc.) is also an example of an operation of the controller (215).For example, the controller (215) outputting a first control signal for generating AC power having a first frequency to the inverter (218) may mean that the controller (215) outputs a control signal (Q1_DRV, Q3_DRV) for controlling the switches (Q1, Q3) to be on for a first period corresponding to the first frequency, and then outputs a control signal control signal (Q2_DRV, Q4_DRV) for controlling the switches (Q2, Q4) to be on for a second period corresponding to the first frequency, and repeats the above-described output operations. Meanwhile, the controller (215) outputting a second control signal for generating AC power having a second frequency to the inverter (218) may mean that the controller (215) outputs a control signal (Q1_DRV, Q3_DRV) for controlling the switches (Q1, Q3) to be in an on state for a first period corresponding to the second frequency, and then outputs a control signal (Q2_DRV, Q4_DRV) for controlling the switches (Q2, Q4) to be in an on state for a second period corresponding to the second frequency, and repeats the above-described output operations. In this case, the first period and the second period corresponding to the second frequency may be different from the first period and the second period corresponding to the first frequency. At least one of the DC / DC converter (217) or the inverter (218) may be referred to as a power supply circuit. The controller (215) can control a power supply circuit (e.g., at least one of a DC / DC converter (217) or an inverter (218)) so that power is applied to the coil (213).

[0057] According to one embodiment, an AC power generated by an inverter (218) may be applied to a coil (213). The inverter (212) may form a resonant circuit with the coil (213). The coil (213) may form a magnetic field based on the applied AC power. A portion of the magnetic field (or magnetic flux) formed by the coil (213) may pass through a cross-section of the coil (221) of the electronic device (101). As the magnetic field passing through the cross-section of the coil (221) changes over time, an induced electromotive force (e.g., current, voltage, or power) may be generated in the coil (221).

[0058] According to one embodiment, the demodulation circuit (214) can demodulate a signal applied to the coil (213) (e.g., a voltage (219) applied to both ends of the coil (213)) and output a demodulated signal (Vdemod). The demodulation circuit (214) can output the demodulated signal (Vdemod) by, for example, down-converting the signal applied to the coil (e.g., the voltage (219) at both ends) by the frequency of the AC power (e.g., 100 to 210 kHz). For example, the demodulation circuit (214) can include a mixer and / or multiplier circuit for removing a carrier component for wireless power transmission (e.g., a frequency of the AC power of 100 to 210 kHz). Here, since a waveform in which a component by modulation of the electronic device (101) and an AC power component by the external electronic device (201) are mixed can be applied to both ends of the coil (213) of the external electronic device (201), the frequency component of the AC power (e.g., 100 to 210 kHz) is named a carrier component accordingly, and those skilled in the art will understand that the electronic device (101) does not actually generate an electromagnetic wave in which modulated data is mixed with a carrier wave. Accordingly, the carrier component (e.g., 100 to 210 kHz, which is the frequency of the AC power) can be removed from the voltage (219) across both ends of the coil (213). The demodulation circuit (214) may additionally filter (low-pass filter) the demodulation signal (Vdemod) and output it. The demodulation circuit (214) may include a low-pass filter. Alternatively, the demodulation circuit (214) may generate a demodulation signal (Vdemod) by filtering the voltage (219) across the coil (213) and then downconverting it by the frequency of the AC power (e.g., 100 to 210 kHz). The amplitude of the voltage (219) across the coil (213) may be changed according to the ASK modulation of the electronic device (101).According to one embodiment, the controller (215) can check the information provided by the electronic device (101) based on the demodulation signal (Vdemod) output by the demodulation circuit (214). The controller (215) can, for example, perform analog-to-digital converting (ADC) on the demodulation signal (Vdemod). The controller (215) can decode the digital value obtained as the ADC result, and check the information provided by the electronic device (101) according to the decoding result. The decoding method may be based on the Qi standard, for example, but those skilled in the art will understand that there is no limitation thereto. Meanwhile, in the above-described embodiment, it has been described that the demodulation circuit (214) performs frequency downconversion (e.g., carrier wave removal) and / or low-pass filtering, and the controller (215) performs ADC and / or decoding, but this is merely exemplary. Those skilled in the art will appreciate that the demodulation circuit (214) may be implemented to further perform at least one of ADC or decoding, and that the controller (215) may be implemented to further perform frequency downconversion (e.g., carrier rejection) and / or low-pass filtering.

[0059] According to one embodiment, the electronic device (101) may include at least one of a coil (221), a capacitor (e.g., a first capacitor) (222), a capacitor (e.g., a second capacitor) (223), a rectifier circuit (255), a controller (250), a plurality of capacitors (261, 262, 263, 264) (the number of capacitors shown in FIG. 2A should not be considered limiting), a plurality of switches (231, 232, 233, 234) (the number of switches shown in FIG. 2A should not be considered limiting), a capacitor (241), a regulator (242), a capacitor (243), or a charger (244).

[0060] According to one embodiment, the coil (221), the capacitor (222), and the capacitor (223) may form a resonant circuit. One end of the capacitor (222) may be connected to the coil (221), and the other end of the capacitor (222) may be connected to one end of the capacitor (223) and one end of the rectifier circuit (255). One end of the capacitor (223) may be connected to the other end of the capacitor (222), and the other end of the capacitor (223) may be connected to the other end of the coil (221). In other words, the capacitor (223) may be connected in parallel to a circuit formed by connecting the coil (221) and the capacitor (222) in series. The other end of the capacitor (223) may be connected to the other end of the rectifier circuit (255).

[0061] According to one embodiment, the rectifier circuit (255) can convert AC power received through the coil (221) into DC power. The controller (250) (e.g., control circuit) can control the on / off states of a plurality of switches (S1, S2, S3, S4) so ​​that the AC power can be converted into DC power.

[0062] According to one embodiment, a capacitor (241) and a regulator (242) may be connected to the rectifier circuit (255). One end of the capacitor (241) may be grounded. The regulator (242) may perform voltage conversion (e.g., buck converting and / or boost converting) and / or regulating of the voltage of rectified power output from the power conversion circuit.

[0063] In one embodiment, the charger (244) (e.g., charging circuit and / or power management circuit) can charge a battery (not shown) using power converted and / or regulated by the regulator (242). In one embodiment, the charger (244) can control the voltage and / or current for charging the battery depending on the charging mode of the battery (e.g., constant current (CC) mode, constant voltage (CV) mode, or rapid charge mode). Depending on the implementation, a PMIC (not shown) may be connected to the regulator (242) instead of the charger (244).

[0064] According to one embodiment, the controller (250) can perform modulation in response to information to be provided. The controller (250) can determine which capacitor among the plurality of capacitors (261, 262, 263, 264) will perform modulation. Depending on the capacitor to perform modulation, the difference in amplitude of the voltage (219) sensed by the external electronic device (201) can change. For example, when modulation is performed using only one capacitor (261), it is assumed that the difference in amplitude of the voltage (219) sensed by the external electronic device (201) (e.g., the difference between the maximum amplitude of the voltage (219) while the switch (231) is on and the maximum amplitude of the voltage (219) while the switch (231) is off) is a first value. In this case, since the capacitors (262, 263, 264) are not used for modulation, the switches (232, 233, 234) can be maintained in the off state. Meanwhile, when modulation is performed with the capacitors (261) and (262), the difference in the amplitude of the voltage (219) sensed by the external electronic device (201) (for example, the difference between the maximum amplitude of the voltage (219) while the switches (231, 232) are in the on state and the maximum amplitude of the voltage (219) while the switches (231, 232) are in the off state) may be a second value, which may be greater than the first value. In this case, since the capacitors (263, 264) are not used for modulation, the switches (233, 234) can be maintained in the off state. The electronic device (101) can adjust the modulation degree (or modulation depth) by adjusting a capacitor among a plurality of capacitors (261, 262, 263, 264) to perform modulation. As described above, the controller (250) can output and / or refrain from outputting at least some of the control signals (CMA1, CMA2, CMB1, CMB2) so that the switches corresponding to the non-determined capacitors are kept in an off state while performing modulation using the determined capacitors.Meanwhile, for example, the capacitance of the capacitor (262) may be smaller than the capacitance of the capacitor (261), and the capacitance of the capacitor (264) may be smaller than the capacitance of the capacitor (263), but this is a simple example and there is no limitation on the size of the capacitance, and they may be the same.

[0065] The controller (215) described in the above-described FIG. 2b may be referred to as a control circuit and may be an MCU (micro controlling unit), an FPGA (field programmable gate array), an ASIC (application specific integrated circuit), at least one processor, or an AP (application processor). The controller (250) may be referred to as a control circuit and may be an MCU (micro controlling unit), an FPGA (field programmable gate array), an ASIC (application specific integrated circuit), at least one processor, or an AP (application processor).

[0066] FIG. 3 is a diagram illustrating an example configuration of an electronic device according to one embodiment.

[0067] Referring to FIGS. 2A, 2B, and 3, an electronic device (101) according to one embodiment (e.g., the electronic device (101) of FIGS. 1 and 2A) may be configured to support multiple operating frequencies (e.g., a first operating frequency (e.g., an operating frequency in a 350 kHz band) and a second operating frequency (e.g., an operating frequency in a 110 to 145 kHz band)), and may include a coil (221) that wirelessly receives power from a wireless charging transmitter (201) (e.g., the electronic device (201) of FIG. 2A), a resonant circuit including a first capacitor (222) and a second capacitor (223), a rectifier circuit (255) connected to the resonant circuit, a communication circuit (e.g., the communication circuit (190) of FIG. 1), and a control circuit (e.g., the processor (120) of FIG. 1) electrically connected to the rectifier circuit (255), the resonant circuit, and the communication circuit. In various embodiments, the rectifier circuit (255) and its control are considered without explicit reference to other components of the electronic device. For example, the presence of a control circuit and a circuit for wirelessly receiving power is implicit.

[0068] According to one embodiment, the rectifier circuit (255) may include a plurality of switches (S1, S2, S3, S4) (e.g., four diodes or transistors) forming a full bridge circuit and a plurality of switch driver circuits electrically connected to each of the plurality of switches. One end of the resonant circuit may be connected to a connection point between the switches (S1, S2), and the other end of the resonant circuit may be connected to a connection point between the switches (S3, S4). The rectifier circuit (255) may rectify (e.g., convert to direct current (DC)) wireless power (e.g., alternating current (AC) power) received from the coil (221) and apply the rectified power to a charger (e.g., a charger (244) of FIG. 2B, a charging circuit, and / or a power management circuit) through a regulator (e.g., a main LDO) (242).

[0069] According to one embodiment, the rectifier circuit (255) may have an input terminal connected in parallel with a second capacitor (e.g., Cd) (223), a controller (250) may be connected to the input terminal, and a regulator (242) may be connected to the output terminal. According to one embodiment, the second capacitor (223) may have one end connected to the first capacitor (222) (e.g., a resonant capacitor (Cs)). According to one embodiment, the first capacitor (222) may have one end connected to the coil (221) and the other end connected to the second capacitor (233). Without being limited thereto, the rectifier circuit (255) may be named a 'rectifier circuit' by separately forming a plurality of switch driver circuits included in the rectifier circuit (255) and including a plurality of switches (S1, S2, S3, S4). Here, it may be referred to as a 'receiver integrated circuit (e.g., RX IC)' including a rectifier circuit (255) and a regulator (242).

[0070] According to one embodiment, the plurality of switch driver circuits may include a first switch driver circuit (310), a second switch driver circuit (320), a third switch driver circuit (330), and a fourth switch driver circuit (340). For example, the first switch driver circuit (310) may be connected to a first switch (S1), the second switch driver (320) may be connected to a second switch (S2), the third switch driver (330) may be connected to a third switch (S3), and the fourth switch driver (340) may be connected to a fourth switch (S4).

[0071] According to one embodiment, the first switch driver circuit (310) may include a first switch driver (311), a diode (312), and a capacitor (313) having one end (e.g., an input end) connected to a coil (221) and a + terminal (e.g., a P terminal) of a second capacitor (223), and the other end (e.g., an output end) connected to a first switch (S1). The first switch driver circuit (310) may be applied with a first voltage (e.g., Vac, p) to one end, and may output an enable signal to the first switch (S1) connected to the other end based on a designated delay value (e.g., an output voltage (Vcp, n) of the second delay unit (343)). The first switch driver (311) may be applied with a third voltage (Vcp, n) (e.g., an output voltage of the second delay unit (343)) to one end.

[0072] According to one embodiment, the second switch driver circuit (320) may include a second switch driver (321), a diode (322), and a capacitor (323) having one end connected to a - terminal (e.g., an n terminal) of a coil (221) and a second capacitor (223), and the other end connected to a second switch (S2). The second switch driver circuit (320) may output an enable signal to the second switch (S2) connected to the other end based on a second voltage being applied to one end thereof, and a designated delay value (e.g., an output voltage (Vcp, p) of the first delay unit (333)). The second switch driver (311) may be applied with a fourth voltage (Vcp, p) (e.g., an output voltage of the first delay unit (333)).

[0073] According to one embodiment, the third switch driver circuit (330) is connected to one end of the + terminal (e.g., the P terminal) of the coil (221) and the second capacitor (223) (not shown in FIG. 3), and the other end is connected to the third switch (S3), and may include the third switch driver (331), the first delay unit (333), or the first comparator (335). The first delay unit (333) may be located between the third switch driver (331) and the first comparator (335). The third switch driver circuit (330) may output an enable signal to the third switch (S3) by the third switch driver (331) after delaying for a set delay time based on a delay value (Vcp, p) designated by the first delay unit (333) based on the first voltage being applied to one end thereof. The output voltage (Vcp, p) of the first delay unit (333) can be applied to the second switch driver (321). One end of the first comparator (335) can be connected to the + terminal (e.g., P terminal) of the coil (221) and the second capacitor (223), and the other end can be connected to ground. According to one embodiment, by performing a switching operation after a predetermined time delay (e.g., switching delay) based on the delay value output by the first delay unit (333), an effect similar to that obtained when, for example, a capacitor and a resistor (R) are connected in series in an equivalent circuit can be obtained.

[0074] According to one embodiment, the fourth switch driver circuit (340) may have one end connected to both ends of a second capacitor (223) (not shown in FIG. 3) and the other end connected to a fourth switch (S4), and may include a fourth switch driver (341), a second delay unit (343), and a second comparator (345). The second delay unit (343) may be configured between the fourth switch driver (341) and the second comparator (345). The fourth switch driver circuit (340) may output an enable signal to the fourth switch (S4) after delaying for a delay time corresponding to a delay value specified by the second delay unit (343) based on the second voltage being applied to one end thereof. The output voltage (Vcp,n) of the second delay unit (343) may be applied to the first switch driver (311). One end of the second comparator (345) may be connected to the - terminal (e.g., n terminal) of the coil (221) and the second capacitor (223), and the other end may be connected to ground. According to one embodiment, by performing a switching operation after a predetermined time delay (e.g., switching delay) based on the delay value output by the second delayer (343), an effect similar to that obtained when, for example, a capacitor and a resistor (R) are connected in series in an equivalent circuit may be obtained.

[0075] According to one embodiment, a plurality of switches (S1, S2, S3, S4) may be formed as a full bridge circuit. One end of the first switch (S1) and one end of the second switch (S2) may be connected to a regulator (242), one end of the third switch (S3) may be connected to the other end of the first switch (S1), and one end of the fourth switch (S4) may be connected to the other end of the second switch (S2). The other end of the third switch (S3) and the other end of the fourth switch (S4) may be connected to ground. The other end of the first switch (S1) and one end of the third switch (S3) can be connected to one end of the first capacitor (222) (Cs) and the second capacitor (223) (Cd), and one end of the fourth switch (S4) and the other end of the second switch (S2) can be connected to the other end of the coil (221) and the other end of the second capacitor (223) (Cd).

[0076] In one embodiment, the controller (250) (e.g., control circuit) may receive information related to an operating frequency received via the communication circuit (190) (or obtain information related to an operating frequency, such as via a memory of the electronic device 101 or from an external source other than the external electronic device 201), and identify (e.g., detect, verify, etc.) the operating frequency based on the information related to the operating frequency. In one embodiment, the controller (250) may detect the operating frequency based on a voltage (Vac) of a signal induced in the coil (221). In various examples, more generally, the controller (250) identifies the operating frequency or an indication thereof. The control circuit (250) controls at least one delay unit (e.g., the first delay unit (333) and / or the second delay unit (343)) to operate based on the identified operating frequency, and can adjust (e.g., modify, change, set, control, etc.) the switching timing of at least two switches (e.g., the third switch (S3) or / and the fourth switch (S4)) respectively connected to at least two switch driver circuits with the designated delay value of the delay unit. In various examples, the controller (250) detects whether the operating frequency is the first operating frequency (e.g., whether there is, etc.), and adjusts the switching timing with the delay value of the delay. And / or, if the operating frequency is the second operating frequency, the controller (250) performs switching without driving the delay (or controls the switching operation of the switch).

[0077] According to one embodiment, the controller (250) can control to turn on the first switch (S1) and the fourth switch (S4) for a first period of time and turn off the second switch (S2) and the third switch (S3) based on the output of an enable signal from the first switch driver circuit (310) and the fourth switch driver circuit (340) after delaying for a predetermined period of time based on the delay value output by the second delay unit (343) included in the fourth switch driver circuit (340).

[0078] According to one embodiment, the controller (250) can control to turn on the second switch (S2) and the third switch (S3) for a second period and turn off the first switch (S1) and the fourth switch (S4) based on the output of an enable signal from the second switch driver circuit (320) and the third switch driver circuit (330) after a predetermined period of delay based on the delay value output by the first delay unit (333) included in the third switch driver circuit (330).

[0079] In one embodiment, the regulator (242) may convert the rectified voltage (VRECT) from the rectifier circuit (255) into a specific direct current (DC) voltage and transmit power to the charger. The regulator (240) may be configured to be electrically connected to the rectifier circuit (255) and the controller (250).

[0080] FIG. 4 is a diagram for comparing an operating waveform of an electronic device according to one embodiment and a conventional operating waveform.

[0081] Referring to FIGS. 2A, 2B, and 4, the operating waveforms (420) may be output with a delay from time t1 to time t2 in comparison with the existing comparative operating waveforms (410) due to the switching operation of the rectifier circuit (255) of the electronic device (101) according to one embodiment, in which the current (RX coil current) and / or voltages (e.g., Vcp, n, Vac, n, and Vac, p) are output. Accordingly, a phase difference occurs between the current and the input terminal (AC terminal) voltage, which can have the same effect as reducing the resonant capacitor value.

[0082] An electronic device (101) according to one embodiment does not include an additional circuit for changing a resonant capacitor in a resonant circuit, and can efficiently perform wireless charging when the operating frequency is changed by utilizing a switching operation of a rectifier circuit (255) without changing the resonant capacitor.

[0083] According to one embodiment, the electronic device (101) exhibits an effect such as reducing the resonant capacitor value due to the phase difference between the current and the input terminal (AC terminal) voltage through a switching operation in the rectifier circuit (255), so that the electronic device (101) of the present disclosure can increase efficiency according to the operating frequency (e.g., switching frequency).

[0084] Case 1, Case 2, Case 3, Switching frequency 145kHz, 350kHz, 350kHz, 350kHz, 147nF, 147nF, 27nF, 147nFProg. Delay 0s, 0s, 150ns, Simulation efficiency 77.23%, 75.91%, 82.65%, 79.77%

[0085] As shown in the above , in the comparative cases (case 1, case 2, case 3), when the switching frequency is changed from, for example, 145 kHz to 350 kHz, and the value of the first capacitor (222) (Cs) is changed from, for example, 147 nF to 27 nF, and there is no delay (for example, the delay time is 0 s), it can be seen that the simulation efficiency increases to, for example, approximately 82.65%. In comparison, according to one embodiment of the present disclosure (case of the present disclosure), when the electronic device (101) supports both the first operating frequency (for example, 350 kHz) and the second operating frequency (for example, 110 kHz to 145 kHz) and the switching frequency is changed to, for example, 350 kHz, the delay unit operates to delay the switching operation by a specified delay value (prog. delay) (for example, 150 ns), so that the simulation efficiency increases to, for example, approximately 79.77%. Not limited thereto, the above is an example confirmed through experiments, and the simulation efficiency may be calculated as a different value depending on the device characteristics (e.g., type or performance). For example, if the electronic device (101) uses only the first operating frequency (e.g., 350 kHz), the delay unit may always be operated in an on state.

[0086] According to one embodiment, an electronic device (e.g., an electronic device (101) of FIG. 1, an electronic device (101) of FIGS. 2A and 2B) may include a coil (221) configured to wirelessly receive power from an external electronic device (e.g., a wireless charging transmitter (201) of FIGS. 2A and 2B), a resonant circuit including a first capacitor (222), a rectifier circuit (e.g., a rectifier circuit (255) of FIGS. 2A and 3) connected to the resonant circuit, a communication circuit (e.g., a communication module (190) of FIG. 1), and a control circuit (e.g., a processor of FIG. 1, a controller (250) of FIG. 2A) electrically connected to the rectifier circuit, the resonant circuit, and the communication circuit.

[0087] According to one embodiment, the rectifier circuit includes a plurality of switches (S1, S2, S3, S4), a plurality of switch driver circuits (e.g., a plurality of switch driver circuits (310, 320, 330, 340) of FIG. 3) each electrically connected to one of the plurality of switches, and at least two of the plurality of switch driver circuits may include at least one delay unit.

[0088] According to one embodiment, the control circuit may be configured to determine the first operating frequency based on information related to the operating frequency received from the external electronic device.

[0089] According to one embodiment, the control circuit may be configured to control the driving of the at least one delay based on the first operating frequency, and to adjust the switching timing of at least two switches among the plurality of switches by a designated delay value of the at least one delay.

[0090] According to one embodiment, the control circuit may be configured to determine a second operating frequency based on information related to the frequency, and to control a switching operation of the plurality of switches without operating the at least one delay unit based on the second operating frequency.

[0091] According to one embodiment, the control circuit may be configured to control the rectifier circuit to turn on the at least two switches, each connected to the at least two switch driver circuits, at the adjusted switching timing.

[0092] According to one embodiment, the electronic device may further include a regulator connected to an output terminal of at least two of the plurality of switches.

[0093] According to one embodiment, the resonant circuit further includes a second capacitor, wherein the first capacitor has one end connected to the coil and the other end connected to the first capacitor, and the second capacitor has one end connected in series to the other end of the first capacitor, the other end connected to the coil, and may be connected in parallel to the rectifier circuit.

[0094] According to one embodiment, the plurality of switch driver circuits may include a first switch driver circuit (e.g., the first switch driver circuit (310) of FIG. 3), a second switch driver circuit (e.g., the first switch driver circuit (320) of FIG. 3), a third switch driver circuit (e.g., the first switch driver circuit (330) of FIG. 3), and a fourth switch driver circuit (e.g., the first switch driver circuit (340) of FIG. 3).

[0095] According to one embodiment, the plurality of switches may include a first switch (S1), a second switch (S2), a third switch (S3), and a fourth switch (S4), and may be configured as a full bridge circuit.

[0096] According to one embodiment, the first switch driver circuit includes a first switch driver, the second switch driver circuit includes a second switch driver, the third switch driver circuit includes a third switch driver, a first comparator, and a first delay unit, wherein the first delay unit is configured between the second switch driver and the first comparator, and the fourth switch driver circuit includes a fourth switch driver, a second comparator, and a second delay unit, wherein the second delay unit can be configured between the fourth switch driver and the second comparator.

[0097] According to one embodiment, the first switch driver circuit can output a first enable signal to the first switch connected to the other end of the first switch driver circuit after performing a delay based on a second delay value output by the second delay unit based on a first voltage (Vac, p) being applied to one end of the first switch driver circuit.

[0098] According to one embodiment, the fourth switch driver circuit may output a fourth enable signal to the fourth switch connected to the other end of the fourth switch driver circuit after performing a delay based on the second delay value output by the second delay unit based on the second voltage (Vac, n) being applied to one end.

[0099] According to one embodiment, the second switch driver circuit can output a second enable signal to the second switch connected to the other end of the second switch driver circuit after performing a delay based on a first delay value output by the first delay unit based on a second voltage being applied to one end.

[0100] According to one embodiment, the third switch driver circuit can output a third enable signal to the third switch connected to the other end of the third switch driver circuit after performing a delay based on the first delay value output by the first delay unit based on the first voltage being applied to one end.

[0101] According to one embodiment, the control circuit can control to turn on the first switch and the fourth switch and turn off the second switch and the third switch for a second period based on the second delay value output by the second delay circuit, after delaying for a first period, and then based on the first enable signal output by the first switch driver circuit and the fourth enable signal output by the fourth switch driver circuit.

[0102] According to one embodiment, the control circuit can control to turn on the second switch and the third switch and turn off the first switch and the fourth switch for a fourth period based on the second enable signal output from the second switch driver circuit and the third enable signal output from the third switch driver circuit after delaying for a third period based on the first delay value output by the first delay unit.

[0103] FIG. 5 is a diagram illustrating an example of an operating method in an electronic device according to one embodiment. In the following embodiments, the respective operations may be performed sequentially, but are not necessarily performed sequentially. For example, the order of the respective operations may be changed, and at least two operations may be performed in parallel. In the description of the operating method according to one embodiment, a device for transmitting wireless power (e.g., a wireless power transmitting device) may be referred to as an external electronic device, and a device for receiving wireless power (e.g., a wireless power receiving device) may be referred to as an electronic device.

[0104] An electronic device according to one embodiment (e.g., the electronic device (101) of FIG. 1, the electronic device (101) of FIG. 2A, FIG. 2B, and FIG. 3) may be a device that supports multiple operating frequencies.

[0105] Referring to FIG. 5, in operation 501, the electronic device may be connected to an external electronic device (e.g., the external electronic device (201) of FIGS. 2A, 2B, and 3) through a communication circuit (190), and information related to an operating frequency (e.g., a switching frequency) may be received from the external electronic device through the communication circuit (190). That is, in operation 501, the electronic device (101) may receive or otherwise obtain information related to an operating frequency.

[0106] In operation 503, the electronic device can determine whether the first operating frequency is confirmed based on information related to the received operating frequency. If the first operating frequency is confirmed, the electronic device can perform operation 505, and if not, the electronic device can perform operation 509.

[0107] In operation 505 (operation 503-Example), the electronic device may drive (e.g., control, execute, operate, apply, etc.) at least one delay (e.g., the first delay (333) and / or the second delay (343) of FIG. 3) included in a rectifier circuit (e.g., the rectifier circuit (255) of FIGS. 2B and 3) of the electronic device based on a first operating frequency or based on identifying the first operating frequency in an external electronic device. For example, the rectifier circuit may be connected in parallel to a resonant circuit of the electronic device and may include a plurality of switches (e.g., S1, S2, S3, S4 of FIG. 3) and a plurality of switch driver circuits (e.g., the plurality of switch driver circuits (310, 320, 330, 340) of FIG. 3) electrically connected to each of the plurality of switches. For example, at least one delay circuit may be electrically connected to (e.g., included in) at least two of the plurality of switch driver circuits.

[0108] In operation 507, the electronic device can adjust (e.g., modify, change, set, control, etc.) the switching timing of at least two switches, each of which is connected to at least two switch driver circuits among the plurality of switches, with a specified delay value, and perform a switching operation of the plurality of switches based on the adjusted switching timing. For example, the switching timing of the first switch S1 and the fourth switch S4 and / or the second switch S2 and the third switch S3 is adjusted, respectively, by adjusting the delay values ​​of the first delay 333 and / or the second delay 343.

[0109] In operation 509 (operation 503-No), the electronic device can determine a second operating frequency (e.g., 145 kHz) based on determining that the first operating frequency is not detected by the external electronic device or based on identifying the second operating frequency itself, and perform switching operations of the plurality of switches without operating the delay unit based on the second operating frequency. The second operating frequency may be a lower operating frequency than the first operating frequency. For example, the first operating frequency is 350 kHz.

[0110] According to one embodiment, when performing an operation of switching a plurality of switches in operation 507, the electronic device may delay for a predetermined period of time based on a delay value output by a second delay unit (e.g., the second delay unit (343) of FIG. 3) included in the fourth switch driver circuit, based on a first voltage being applied to a first switch driver circuit (e.g., the first switch driver circuit (310) of FIG. 3) among the plurality of switch drivers and a second voltage being applied to each end of a fourth switch driver circuit (e.g., the fourth switch driver circuit (340) of FIG. 3). After a predetermined period of time (which may be the same as or different from the previously mentioned specific period), the electronic device may output an enable signal to a first switch among the plurality of switches by the first switch driver circuit, and output an enable signal to a fourth switch by the fourth switch driver circuit. The electronic device can turn on the first switch and the fourth switch for a first period of time and turn off the second switch and the third switch based on the output of an enable signal from each of the first switch driver circuit and the fourth switch driver circuit after a predetermined delay time based on the delay value output by the second delay circuit.

[0111] According to one embodiment, when performing an operation of switching a plurality of switches in operation 507, the electronic device may delay for a predetermined period of time based on a delay value output by a first delay unit (e.g., a first delay unit (333) of FIG. 3) included in the third switch driver circuit, based on a second voltage being applied to one end of a second switch driver circuit (e.g., a second switch driver circuit (320) of FIG. 3) among the plurality of switch drivers and a first voltage being applied to one end of a third switch driver (e.g., a third switch driver circuit (330) of FIG. 3). After the predetermined period of time delay, the electronic device may output an enable signal to a second switch among the plurality of switches by the second switch driver circuit, and output an enable signal to a third switch by the third switch driver circuit. The electronic device can turn on the second switch and the third switch for a second period of time and turn off the first switch and the fourth switch based on the output of an enable signal from each of the second switch driver circuit and the third switch driver circuit after delaying for a predetermined period of time (which may be the same as or different from the previously mentioned specific period) based on the delay value output by the first delay circuit.

[0112] According to one embodiment, an operating method in an electronic device (e.g., electronic device (101) of FIG. 1, external electronic device (201) of FIGS. 2A, 2B, and 3) may include an operation of confirming a first operating frequency based on information related to an operating frequency received from an external electronic device (201).

[0113] According to one embodiment, the method may include driving at least one delay circuit included in a rectifier circuit of the electronic device (e.g., rectifier circuit (255) of FIG. 2B) based on the first operating frequency.

[0114] According to one embodiment, the method may include adjusting the switching timing of at least two switches, each of which is connected to at least two switch driver circuits among a plurality of switches (S1, S2, S3, S4) included in the rectifier circuit, by a delay value of the at least one delay unit.

[0115] According to one embodiment, the method may include an operation of performing switching of the plurality of switches based on the adjusted switching timing.

[0116] According to one embodiment, the plurality of switches may each be electrically connected to one of the plurality of switch driver circuits included in the rectifier circuit (e.g., the plurality of switch driver circuits (310, 320, 330, 340) of FIG. 3). According to one embodiment, at least two of the plurality of switch driver circuits may include the at least one delay unit.

[0117] According to one embodiment, the method may further include an operation of identifying a second operating frequency based on information related to the operating frequency, and performing switching of the plurality of switches without operating the at least one delay unit based on the second operating frequency.

[0118] According to one embodiment, the operation of performing switching of the plurality of switches may include an operation of turning on the at least two switches respectively connected to the at least two switch driver circuits at the adjusted switching timing and turning off the remaining switches.

[0119] According to one embodiment, the operation of performing switching of the plurality of switches may include an operation of delaying based on a second delay value output by a second delay unit based on a first voltage (Vac, p) applied to one end of a first switch driver circuit among the plurality of switch driver circuits, and then outputting a first enable signal to a first switch connected to the other end of the first switch driver circuit among the plurality of switches, and an operation of delaying based on the second delay value output by the second delay unit based on a second voltage (Vac, n) applied to one end of a fourth switch driver circuit among the plurality of switch driver circuits, and then outputting an enable signal to a fourth switch connected to the other end of the fourth switch driver circuit among the plurality of switches.

[0120] In one embodiment, the second delay unit may be included in the fourth switch driver circuit.

[0121] According to one embodiment, the operation of performing switching of the plurality of switches may further include an operation of delaying based on a first delay value output by a first delay unit based on the second voltage being applied to one end of the second switch driver circuit among the plurality of switch driver circuits, and then outputting a second enable signal to a second switch connected to the other end of the second switch driver circuit among the plurality of switches, and an operation of delaying based on the first delay value output by the first delay unit based on the first voltage being applied to one end of the third switch driver circuit among the plurality of switch driver circuits, and then outputting a third enable signal to a third switch connected to the other end of the third switch driver circuit among the plurality of switches.

[0122] According to one embodiment, the first delay unit may be included in the third switch driver circuit.

[0123] According to one embodiment, the operation of performing switching of the plurality of switches may further include an operation of delaying for a first period based on the second delay value output by the second delay unit, and then turning on the first switch and the fourth switch and turning off the second switch and the third switch for a second period based on the first enable signal being output from the first switch driver circuit and the fourth enable signal being output from the fourth switch driver circuit.

[0124] According to one embodiment, the operation of performing switching of the plurality of switches may further include an operation of delaying for a third period based on the first delay value output by the first delay unit, and then turning on the second switch and the third switch and turning off the first switch and the fourth switch for a fourth period based on the second enable signal being output from the second switch driver circuit and the third enable signal being output from the third switch driver circuit.

[0125] According to one embodiment, in a non-transitory storage medium storing a program, the program may include instructions set to cause the electronic device (e.g., the electronic device (101) of FIG. 1, the electronic device (101) of FIGS. 2A and 2B) to, when executed by a processor of the electronic device, perform an operation of confirming a first operating frequency based on information related to an operating frequency received from an external electronic device, an operation of driving at least one delay unit included in a rectifier circuit (e.g., the rectifier circuit (255) of FIG. 2B) of the electronic device based on the first operating frequency, an operation of adjusting the switching timing of at least two switches respectively connected to at least two switch driver circuits among a plurality of switches (S1, S2, S3, S4) included in the rectifier circuit based on a delay value of the at least one delay unit, and an operation of performing switching of the plurality of switches based on the adjusted switching timing.

[0126] According to one embodiment, each of the plurality of switches is electrically connected to one of the plurality of switch driver circuits included in the rectifier circuit (e.g., the plurality of switch driver circuits (310, 320, 330, 340) of FIG. 3), and at least two of the plurality of switch driver circuits may include the at least one delay unit.

[0127] According to one embodiment, the operation of performing switching of the plurality of switches may include an operation of turning on the at least two switches respectively connected to the at least two switch driver circuits at the adjusted switching timing and turning off the remaining switches.

[0128] According to one embodiment, the operation of performing switching of the plurality of switches includes: an operation of delaying based on a second delay value output by a second delay unit based on a first voltage (Vac, p) applied to one end of a first switch driver circuit among the plurality of switch driver circuits, and then outputting a first enable signal to a first switch connected to the other end of the first switch driver circuit among the plurality of switches; an operation of delaying based on a second voltage (Vac, n) applied to one end of a fourth switch driver circuit among the plurality of switch driver circuits, and then outputting a fourth enable signal to a fourth switch connected to the other end of the fourth switch driver circuit among the plurality of switches; an operation of delaying based on the first delay value output by the first delay unit based on a second voltage (Vac, p) applied to one end of a second switch driver circuit among the plurality of switch drivers, and then outputting a second enable signal to a second switch connected to the other end of the second switch driver circuit among the plurality of switches. The method may further include an operation of outputting an enable signal, and an operation of delaying based on the first delay value output by the first delay unit based on the first voltage being applied to one end of the third switch driver circuit among the plurality of switch drivers, and then outputting a third enable signal to a third switch connected to the other end of the third switch driver circuit among the plurality of switches.

[0129] According to one embodiment, the first delay unit may be included in the third switch driver circuit, and the second delay unit may be included in the fourth switch driver circuit.

[0130] According to one embodiment of the present disclosure, an electronic device (e.g., the electronic device (101) of FIG. 1, the electronic device (101) of FIGS. 2A and 2B) can efficiently perform wireless charging when the operating frequency is changed by utilizing the switching operation of the rectifier circuit without configuring an additional circuit for changing the resonant capacitor in the resonant circuit and without changing the resonant capacitor. The electronic device according to one embodiment can obtain an effect such as reducing the resonant capacitor value due to the phase difference between the current and the input terminal (AC terminal) voltage through the switching operation of the rectifier circuit, and thus the electronic device can increase the efficiency when the operating frequency is changed. In addition, various effects that can be directly or indirectly identified through this document can be provided. The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by those skilled in the art to which the present disclosure belongs from the description below.

[0131] The embodiments disclosed in this document are presented for the purpose of explaining and understanding the disclosed technical content, and do not limit the scope of the technology described in this document. Therefore, the scope of this document should be interpreted to include all modifications or various other embodiments based on the technical concepts of this document.

[0132] Electronic devices according to the various embodiments disclosed in this document may take various forms. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to the embodiments of this document are not limited to the aforementioned devices.

[0133] The various embodiments of this document and the terminology used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly indicates otherwise. In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can include any one of the items listed together in the corresponding phrase among those phrases, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used merely to distinguish one component from another, and do not limit the components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as "coupled" or "connected" to another (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0134] The term "module" used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integral component, or a minimum unit or part of such a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0135] Various embodiments of the present document may be implemented as software (e.g., a program (140)) including one or more instructions stored in a storage medium (e.g., an internal memory (136) or an external memory (138)) readable by a machine (e.g., an electronic device (101)). For example, a processor (e.g., a processor (120)) of the machine (e.g., an electronic device (101)) may call at least one instruction among the one or more instructions stored from the storage medium and execute it. This enables the machine to operate to perform at least one function according to the at least one called instruction. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' simply means that the storage medium is a tangible device and does not contain signals (e.g. electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently or temporarily on the storage medium.

[0136] According to one embodiment, the method according to various embodiments disclosed in this document may be provided as a computer program product. The computer program product may be traded between sellers and buyers as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)) or may be provided through an application store (e.g., Play Store). TM ) or directly between two user devices (e.g., smart phones), online distribution (e.g., downloading or uploading). In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0137] According to various embodiments, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to various embodiments, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to various embodiments, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

Claims

1. In an electronic device (101), A resonant circuit including a coil (221) configured to wirelessly receive power from an external electronic device (201), and a first capacitor (222); A rectifier circuit (255) connected to the above resonant circuit; Communication circuit (190); and It includes a control circuit (120, 250) electrically connected to the above rectifier circuit, the above resonant circuit and the above communication circuit, The above rectifier circuit, The above plurality of switches (S1, S2, S3, S4); A plurality of switch driver circuits (310, 320, 330, 340) each electrically connected to one of the plurality of switches, wherein at least two of the plurality of switch driver circuits include at least one delay unit, The above control circuit, Based on the information related to the operating frequency received from the external device, the first operating frequency is determined, Based on the first operating frequency, controlling to drive the at least one delay unit, and adjusting the switching timing of at least two switches among the plurality of switches with the delay value of the at least one delay unit, An electronic device configured to control switching of the plurality of switches based on the adjusted switching timing.

2. In the first paragraph, the control circuit, Based on the information related to the above operating frequency, the second operating frequency is identified, An electronic device configured to control the switching operation of the plurality of switches based on the second operating frequency, without causing the at least one delay unit to operate.

3. In the first or second paragraph, the control circuit, An electronic device configured to control the rectifier circuit to turn on the at least two switches, each of which is connected to the at least two switch driver circuits, with the adjusted switching timing.

4. In any one of paragraphs 1 to 3, It further includes a regulator (242) connected to the output terminal of at least two switches among the above plurality of switches, The above resonant circuit further includes a second capacitor (223), The first capacitor has one end connected to the coil and the other end connected to the second capacitor, An electronic device wherein the second capacitor has one end connected in series to the other end of the first capacitor, the other end connected to the coil, and is connected in parallel to the rectifier circuit.

5. In any one of paragraphs 1 to 4, The above plurality of switch driver circuits include a first switch driver circuit (310), a second switch driver circuit (320), a third switch driver circuit (330), and a fourth switch driver circuit (340). The above multiple switches include a first switch (S1), a second switch (S2), a third switch (S3), and a fourth switch (S4), and are configured as a full bridge circuit. The above first switch driver circuit includes a first switch driver, The above second switch driver circuit includes a second switch driver, The third switch driver circuit comprises a third switch driver, a first comparator and a first delay unit, wherein the first delay unit is configured between the second switch driver and the first comparator, An electronic device, wherein the fourth switch driver circuit comprises a fourth switch driver, a second comparator, and a second delay unit, wherein the second delay unit is configured between the fourth switch driver and the second comparator.

6. In paragraph 5, The first switch driver circuit outputs a first enable signal to the first switch connected to the other end of the first switch driver circuit after performing a delay based on the second delay value output by the second delay unit based on the first voltage (Vac, p) being applied to one end of the first switch driver circuit, An electronic device in which the fourth switch driver circuit outputs a fourth enable signal to the fourth switch connected to the other end of the fourth switch driver circuit after performing a delay based on the second delay value output by the second delay unit based on the second voltage (Vac, n) being applied to one end. The second switch driver circuit outputs a second enable signal to the second switch connected to the other end of the second switch driver circuit after performing a delay based on the first delay value output by the first delay unit based on the second voltage being applied to one end of the second switch driver circuit. An electronic device in which the third switch driver circuit outputs a third enable signal to the third switch connected to the other end of the third switch driver circuit after performing a delay based on the first delay value output by the first delay unit based on the first voltage being applied to one end.

7. In paragraph 6, the control circuit, After delaying for a first period based on the second delay value output by the second delay unit, the first switch and the fourth switch are turned on and the second switch and the third switch are turned off for a second period based on the first enable signal output from the first switch driver circuit and the fourth enable signal output from the fourth switch driver circuit, An electronic device that controls to turn on the second switch and the third switch, and to turn off the first switch and the fourth switch, for a fourth period, based on the second enable signal output from the second switch driver circuit and the third enable signal output from the third switch driver circuit, after delaying for a third period based on the first delay value output by the first delay unit.

8. In the operating method in the electronic device (101), An operation of confirming a first operating frequency based on information related to an operating frequency received from an external electronic device (201); An operation of driving at least one delay circuit included in a rectifier circuit (255) of the electronic device based on the first operating frequency; An operation of adjusting the switching timing of at least two switches among the plurality of switches (S1, S2, S3, S4) included in the rectifier circuit by the delay value of at least one of the delay units; and An operation for performing switching of the plurality of switches based on the adjusted switching timing is included. The above plurality of switches are each electrically connected to one of the plurality of switch driver circuits (310, 320, 330, 340) included in the above rectifier circuit, A method, wherein at least two of the plurality of switch driver circuits include at least one delay unit.

9. In paragraph 8, Based on the information related to the above operating frequency, the second operating frequency is identified, A method further comprising: performing switching of the plurality of switches without operating the at least one delay unit based on the second operating frequency.

10. In the 8th or 9th clause, the operation of performing switching of the plurality of switches is: A method comprising an operation of turning on at least two switches respectively connected to at least two switch driver circuits with the adjusted switching timing and turning off the remaining switches.

11. In any one of clauses 8 to 10, the operation of performing switching of the plurality of switches is: An operation of delaying based on a second delay value output by a second delay unit based on a first voltage (Vac, p) being applied to one end of a first switch driver circuit among the plurality of switch driver circuits, and then outputting a first enable signal to a first switch connected to the other end of the first switch driver circuit among the plurality of switches; An operation of delaying based on the second delay value output by the second delay unit based on the second voltage (Vac, n) being applied to one end of a fourth switch driver circuit among the plurality of switch driver circuits, and then outputting a fourth enable signal to a fourth switch connected to the other end of the fourth switch driver circuit among the plurality of switches; An operation of delaying based on a first delay value output by a first delay unit based on the second voltage being applied to one end of a second switch driver circuit among the plurality of switch driver circuits, and then outputting a second enable signal to a second switch connected to the other end of the second switch driver circuit among the plurality of switches; and Among the plurality of switch driver circuits, the third switch driver circuit further includes an operation of delaying based on the first delay value output by the first delay unit based on the first voltage being applied to one end, and then outputting a third enable signal to the third switch connected to the other end of the third switch driver circuit among the plurality of switches. The above first delay circuit is included in the third switch driver circuit, A method wherein the second delay circuit is included in the fourth switch driver circuit.

12. In any one of clauses 8 to 11, the operation of performing switching of the plurality of switches is: An operation of turning on the first switch and the fourth switch and turning off the second switch and the third switch for a second period based on the second delay value output by the second delay unit, after delaying for a first period, and then based on the first enable signal being output from the first switch driver circuit and the fourth enable signal being output from the fourth switch driver circuit; and A method further comprising: delaying for a third period based on the first delay value output by the first delay unit, and then turning on the second switch and the third switch, and turning off the first switch and the fourth switch, for a fourth period based on the second enable signal being output from the second switch driver circuit and the third enable signal being output from the third switch driver circuit.

13. In a non-transitory storage medium storing a program, the program, when executed by a processor of an electronic device, the electronic device, An operation for identifying whether there is a change in the operating frequency based on information related to the operating frequency received from an external electronic device; An operation of driving at least one delay circuit (255) included in the rectifier circuit of the electronic device based on identifying that the operating frequency has changed; An operation of adjusting the switching timing of at least two switches, each of which is connected to at least two switch driver circuits among a plurality of switches (S1, S2, S3, S4) included in the rectifier circuit, by the delay value of at least one of the delay units; and A command set to execute an operation of performing switching of the plurality of switches based on the adjusted switching timing, The above plurality of switches are each electrically connected to one of the plurality of switch driver circuits (310, 320, 330, 340) included in the above rectifier circuit, A non-transitory storage medium, wherein at least two of said plurality of switch driver circuits include said at least one delay unit.

14. In the 13th paragraph, the operation of performing switching of the plurality of switches is: A non-transitory storage medium, comprising an operation of turning on at least two switches respectively connected to the at least two switch driver circuits with the adjusted switching timing and turning off the remaining switches.

15. In the 13th paragraph, the operation of performing switching of the plurality of switches is: An operation of delaying based on a second delay value output by a second delay unit based on a first voltage (Vac, p) being applied to one end of a first switch driver circuit among the plurality of switch driver circuits, and then outputting a first enable signal to a first switch connected to the other end of the first switch driver circuit among the plurality of switches; An operation of delaying based on the second delay value output by the second delay unit based on the second voltage (Vac, n) being applied to one end of a fourth switch driver circuit among the plurality of switch driver circuits, and then outputting a fourth enable signal to a fourth switch connected to the other end of the fourth switch driver circuit among the plurality of switches; An operation of delaying based on a first delay value output by a first delay unit based on the second voltage being applied to one end of a second switch driver circuit among the plurality of switch drivers, and then outputting a second enable signal to a second switch connected to the other end of the second switch driver circuit among the plurality of switches; and Among the plurality of switch drivers, the third switch driver circuit further includes an operation of delaying based on the first delay value output by the first delay unit based on the first voltage being applied to one end, and then outputting a third enable signal to the third switch connected to the other end of the third switch driver circuit among the plurality of switches. The above first delay circuit is included in the third switch driver circuit, The second delay unit is a non-transitory storage medium included in the fourth switch driver circuit.

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