KR20220055191A - Method for switching the operation mode of the wireless charging system - Google Patents

Abstract

The present invention relates to an electric device applied with a wireless charging system. A purpose of the present invention is to switch an operation mode without a reset of a system by preventing undershoot of an output voltage when the operation mode is switched to a half bridge mode. According to various embodiments of the present invention, the electric device applied with the wireless charging system includes: a battery; a receiving coil; a first switch electrically connected to one end of the receiving coil; a second switch electrically connected to one end of the receiving coil and connected to the first switch in series; a third switch electrically connected to the other end of the receiving coil; a rectifier circuit including a fourth switch in series and electrically connected to the other end of the receiving coil; a charger supplying the rectified voltage by the rectifier circuit to a system of the electric device and the battery; and a processor. The processor senses a load current supplied to the charger and transmits a first command signal, requesting a reduction in power of a power signal to below a designated first power, to an outer device when the load current becomes lower than a designated first reference current. The processor can operate the rectifier circuit as a dual voltage circuit by continuously activating one among the first switch to the fourth switch when a drop of the rectified voltage is sensed. The present invention also includes various embodiments.

Description

How to switch the operation mode of the wireless charging system

Various embodiments of the present invention relate to an electronic device to which a wireless charging system is applied.

Recently, wireless charging or contactless charging technology has been developed and applied to various electronic devices.

Wireless charging technology is a technology capable of charging the battery of an electronic device without being connected to a wired charger, for example, a technology capable of charging a battery simply by placing a smartphone or a wearable device on a charging pad or a charging cradle.

Wireless charging technology is also being applied between electronic devices and electronic devices. For example, the first electronic device may operate in a Tx mode in which power is wirelessly transmitted using power of a battery included in the first electronic device, and the second electronic device receives power wirelessly from the first electronic device. It can operate in Rx mode for receiving

In a wireless charging system, a wireless power receiving device may receive power from a wireless power transmitting device to charge a battery. The battery of the wireless power receiver reduces the charging current after the constant current (CC) section in which the battery is charged up to a specified voltage (eg, full-charge voltage) with a constant current to maintain the battery voltage at the specified voltage (eg, full-charge voltage) and continues charging. It can be charged through the (constant voltage) section.

In the wireless charging system, in the CV section, the transmit power may be lowered by increasing the frequency of the voltage, lowering the duty cycle, or lowering the amplitude in order to reduce the charging current.

In a wireless charging system, when a full-bridge inverter of a wireless power transmitter is driven in a half-bridge mode to operate in a wider load range, the output voltage is A system reset due to undershoot may occur, and the operating range for half-bridge mode may be narrow.

Various embodiments of the present invention convert the full-bridge inverter to a full-bridge mode and/or a half-bridge mode according to a load condition to enable wireless charging in a wider load range, reduce EMI noise, and switch to a half-bridge mode It is possible to provide a wireless charging system capable of the above switching without system reset by preventing undershoot of the output voltage during operation.

An electronic device for wirelessly receiving power from an external device according to various embodiments of the present disclosure includes a battery, a receiving coil, a first switch electrically connected to one end of the receiving coil, and one end of the receiving coil and electrically a second switch connected and connected in series with the first switch, a third switch electrically connected with the other end of the receiving coil, and electrically connected with the other end of the receiving coil and connected with the third switch in series A rectifier circuit including a fourth switch, a charger for supplying the voltage rectified from the rectifier circuit to the system of the electronic device and the battery, and a processor, wherein the processor detects a load current supplied to the charger and , when the load current is lower than the specified first reference current, transmits a first command signal requesting to lower the power of the power signal to less than the specified first power to the external device, and detects a drop in the rectified voltage When one of the first to fourth switches is continuously activated, the rectifier circuit may be driven as a voltage multiplier circuit.

In the method of driving an electronic device for wirelessly receiving power from an external device according to various embodiments of the present disclosure, the electronic device includes a battery, a receiving coil, a rectifier circuit electrically connected to the receiving coil, and the receiving coil. A processor that communicates with the external device through, and controls the rectifying circuit to rectify a power signal of the external device received through the receiving coil, voltage regulation for adjusting the rectified voltage rectified by the rectifying circuit to a specified voltage circuit, and a charger for supplying the specified voltage to a system of the electronic device and the battery, wherein the method includes: sensing a load current supplied to the charger, wherein the load current is lower than a specified first reference current When the ground, an operation of transmitting a first command signal requesting to lower the power of the power signal to the external device to lower the power of the power signal to less than the specified first power, and detecting a drop in the rectified voltage, any one of the first to fourth switches continuously activating one to drive the rectifier circuit as a voltage multiplier circuit.

An electronic device for wirelessly transmitting power according to various embodiments of the present invention transmits a power signal by controlling a power source, a transmitting coil, a full-bridge inverter electrically connected to the power source and the transmitting coil, and the full-bridge inverter A control circuit that transmits through a coil, and a processor, wherein the full-bridge inverter is electrically connected to one end of the transmitting coil and is a first switch that is turned on in response to a first gate signal of the transmission control circuit, the transmission a second switch electrically connected to the one end of the coil and turned on in response to a second gate signal of the transmission control circuit, the second switch electrically connected to the other end of the transmission coil and turned on in response to a third gate signal of the transmission control circuit a third switch configured to be a third switch, and a fourth switch electrically connected to the other end of the transmission coil and turned on in response to a fourth gate signal of the transmission control circuit, wherein the processor includes: the first switch and the third A full bridge alternately performing an operation of activating a switch and deactivating the second switch and the fourth switch, inactivating the first switch and the third switch, and activating the second switch and the fourth switch control the full-bridge inverter to operate in the full-bridge mode, and receive a first command signal requesting to lower the power of the power signal to less than a specified first power from an external device receiving the power signal while operating in the full-bridge mode In response to receiving, controlling the full-bridge inverter to operate in a half-bridge mode in which only two switches selected from among the first to fourth switches are alternately turned on, and while operating in the half-bridge mode In response to receiving a second command signal requesting to increase the power of the power signal by a specified magnification from an external device, the power of the power signal may be changed to a value corresponding to the specified magnification.

The wireless charging system according to various embodiments of the present invention enables wireless charging in a wider load range by converting the full-bridge inverter to a full-bridge mode and/or a half-bridge mode according to load conditions, and reduces EMI noise and , it is possible to prevent the undershoot of the output voltage when switching to the half-bridge mode, so that the transition can be made without a system reset.

1 is a block diagram of an electronic device in a network environment, according to various embodiments of the present disclosure;
2 is a block diagram of a power management module and a battery, in accordance with various embodiments.
3 is a block diagram illustrating a wireless charging system according to various embodiments.
4 is an operation flowchart of a wireless charging system.
5 is a circuit configuration diagram of a wireless charging system according to various embodiments of the present invention.
6 is an example of gate signals for controlling a full-bridge inverter of a power transmission apparatus according to various embodiments of the present disclosure.
7 is a graph showing the magnitude of transmission power (eg, power of a power signal) according to the PFM mode and the PWM mode.
8 is an operation flowchart of a wireless charging system (eg, the wireless charging system of FIG. 3 ) according to various embodiments of the present disclosure.
9 is an example of an operation scenario of a wireless charging system according to various embodiments of the present disclosure.
10 is another example of an operation scenario of a wireless charging system according to various embodiments of the present disclosure.
11 is an operation flowchart of an apparatus for receiving power according to various embodiments of the present disclosure.
12 is an operation flowchart of an apparatus for receiving power according to various embodiments of the present disclosure.
13 is an operation flowchart of an apparatus for transmitting power according to various embodiments of the present disclosure.

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

The processor 120, for example, executes software (eg, a program 140) to execute at least one other component (eg, a hardware or software component) of the electronic device 101 connected to the processor 120 . It can control and perform various data processing or operations. According to one embodiment, as at least part of data processing or operation, the processor 120 converts commands or data received from other components (eg, the sensor module 176 or the communication module 190 ) to the volatile memory 132 . may be stored in the volatile memory 132 , and may process commands or data stored in the volatile memory 132 , and store the result data in the non-volatile memory 134 . According to an embodiment, the processor 120 is the main processor 121 (eg, a central processing unit or an application processor) or a secondary processor 123 (eg, a graphic processing unit, a neural network processing unit) a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor). For example, when the electronic device 101 includes the main processor 121 and the sub-processor 123 , the sub-processor 123 may use less power than the main processor 121 or may be set to be specialized for a specified function. can The auxiliary processor 123 may be implemented separately from or as a part of the main processor 121 .

The auxiliary processor 123 is, for example, on behalf of the main processor 121 while the main processor 121 is in an inactive (eg, sleep) state, or the main processor 121 is active (eg, executing an application). ), together with the main processor 121, at least one of the components of the electronic device 101 (eg, the display module 160, the sensor module 176, or the communication module 190) It is possible to control at least some of the related functions or states. According to an embodiment, the coprocessor 123 (eg, an image signal processor or a communication processor) may be implemented as part of another functionally related component (eg, the camera module 180 or the communication module 190). there is. According to an embodiment, the auxiliary processor 123 (eg, a neural network processing device) may include a hardware structure specialized for processing an artificial intelligence model. Artificial intelligence models can be created through machine learning. Such learning may be performed, for example, in the electronic device 101 itself on which artificial intelligence is performed, or may be performed through a separate server (eg, the server 108). The learning algorithm may include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but in the above example not limited The artificial intelligence model may include a plurality of artificial neural network layers. Artificial neural networks include deep neural networks (DNNs), convolutional neural networks (CNNs), recurrent neural networks (RNNs), restricted boltzmann machines (RBMs), deep belief networks (DBNs), bidirectional recurrent deep neural networks (BRDNNs), It may be one of deep Q-networks or a combination of two or more of the above, but is not limited to the above example. The artificial intelligence model may include, in addition to, or alternatively, a software structure in addition to the hardware structure.

The memory 130 may store various data used by at least one component of the electronic device 101 (eg, the processor 120 or the sensor module 176 ). The data may include, for example, input data or output data for software (eg, the program 140 ) and instructions related thereto. The memory 130 may include a volatile memory 132 or a non-volatile memory 134 .

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 .

The input module 150 may receive a command or data to be used in a component (eg, the processor 120 ) of the electronic device 101 from the outside (eg, a user) of the electronic device 101 . The input module 150 may include, for example, a microphone, a mouse, a keyboard, a key (eg, a button), or a digital pen (eg, a stylus pen).

The sound output module 155 may output a sound signal to the outside of the electronic device 101 . The sound output module 155 may 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 may be used to receive an incoming call. According to one embodiment, the receiver may be implemented separately from or as part of the speaker.

The display module 160 may visually provide information to the outside (eg, a user) of the electronic device 101 . The display module 160 may include, for example, a control circuit for controlling a display, a hologram device, or a projector and a corresponding device. According to an embodiment, the display module 160 may include a touch sensor configured to sense a touch or a pressure sensor configured to measure the intensity of a force generated by the touch.

The audio module 170 may convert a sound into an electric signal or, conversely, convert an electric signal into a sound. According to an embodiment, the audio module 170 acquires a sound through the input module 150 or an external electronic device (eg, a sound output module 155 ) directly or wirelessly connected to the electronic device 101 . A sound may be output through the electronic device 102 (eg, a speaker or headphones).

The sensor module 176 detects an operating state (eg, power or temperature) of the electronic device 101 or an external environmental state (eg, user state), and generates an electrical signal or data value corresponding to the sensed state. can do. According to one embodiment, the sensor module 176 may 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, It may include a temperature sensor, a humidity sensor, or an illuminance sensor.

The interface 177 may support one or more designated protocols that may be used by the electronic device 101 to directly or wirelessly connect with an external electronic device (eg, the electronic device 102 ). According to an 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.

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

The haptic module 179 may convert an electrical signal into a mechanical stimulus (eg, vibration or movement) or an electrical stimulus that the user can perceive through tactile or kinesthetic sense. According to an embodiment, the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

The camera module 180 may capture still images and moving images. According to an embodiment, the camera module 180 may include one or more lenses, image sensors, image signal processors, or flashes.

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

The battery 189 may supply power to at least one component of the electronic device 101 . According to one embodiment, battery 189 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.

The communication module 190 is a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 101 and an external electronic device (eg, the electronic device 102, the electronic device 104, or the server 108). It can support establishment and communication performance through the established communication channel. The communication module 190 may include one or more communication processors that operate independently of the processor 120 (eg, an application processor) and support direct (eg, wired) communication or wireless communication. According to one embodiment, the communication module 190 is a wireless communication module 192 (eg, a cellular communication module, a short-range communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 194 (eg, : It may include a LAN (local area network) communication module, or a power line communication module). A corresponding communication module among these communication modules is a first network 198 (eg, a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network 199 (eg, legacy It may communicate with the external electronic device 104 through a cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (eg, a telecommunication network such as a LAN or a WAN). These various types of communication modules may be integrated into one component (eg, a single chip) or may be implemented as a plurality of components (eg, multiple chips) separate from each other. The wireless communication module 192 uses the subscriber information (eg, International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 196 within a communication network such as the first network 198 or the second network 199 . The electronic device 101 may be identified or authenticated.

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

The antenna module 197 may transmit or receive a signal or power to the outside (eg, an external electronic device). According to an embodiment, the antenna module 197 may include an antenna including a conductor formed on a substrate (eg, a PCB) or a radiator formed of a conductive pattern. According to an embodiment, the antenna module 197 may include a plurality of antennas (eg, 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 is connected from the plurality of antennas by, for example, the communication module 190 . can be selected. A signal or power may be transmitted or received between the communication module 190 and an external electronic device through the selected at least one antenna. According to some embodiments, other components (eg, a radio frequency integrated circuit (RFIC)) other than the radiator may be additionally formed as a part of the antenna module 197 .

According to various embodiments, the antenna module 197 may form a mmWave antenna module. According to one embodiment, the mmWave antenna module comprises a printed circuit board, an RFIC disposed on or adjacent to a first side (eg, underside) of the printed circuit board and capable of supporting a designated high frequency band (eg, mmWave band); and a plurality of antennas (eg, an array antenna) disposed on or adjacent to a second side (eg, top or side) of the printed circuit board and capable of transmitting or receiving signals of the designated high frequency band. can do.

At least some of the components are connected to each other through a communication method between peripheral devices (eg, a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)) and a signal ( eg commands or data) can be exchanged with each other.

According to an embodiment, the command or data may be transmitted or received between the electronic device 101 and the external electronic device 104 through the server 108 connected to the second network 199 . Each of the external electronic devices 102 or 104 may be the same as or different from the electronic device 101 . According to an embodiment, all or a part of operations executed in the electronic device 101 may be executed in one or more external electronic devices 102 , 104 , or 108 . For example, when the electronic device 101 is to perform a function or service automatically or in response to a request from a user or other device, the electronic device 101 may perform the function or service itself instead of executing the function or service itself. Alternatively or additionally, one or more external electronic devices may be requested to perform at least a part of the function or the service. One or more external electronic devices that have received the request may execute at least a part of the requested function or service, or an additional function or service related to the request, and transmit a result of the execution to the electronic device 101 . The electronic device 101 may process the result as it is or additionally and provide it as at least a part of a response to the request. For this, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used. The electronic device 101 may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device 104 may include an Internet of things (IoT) device. Server 108 may be an intelligent server using machine learning and/or neural networks. According to an embodiment, the external electronic device 104 or the server 108 may be included in the second network 199 . The electronic device 101 may be applied to an intelligent service (eg, smart home, smart city, smart car, or health care) based on 5G communication technology and IoT-related technology.

The electronic device according to various embodiments disclosed in this document may have various types of devices. The electronic device may include, for example, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance device. The electronic device according to the embodiment of the present document is not limited to the above-described devices.

The various embodiments of this document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, but it should be understood to include various modifications, equivalents, or substitutions of the embodiments. In connection with the description of the drawings, like reference numerals may be used for similar or related components. The singular form of the noun corresponding to the item may include one or more of the item, unless the relevant context clearly dictates otherwise. In various embodiments of this document, "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" Each of phrases such as ", and "at least one of A, B, or C" may include any one of, or all possible combinations of, items listed together in the corresponding one of the phrases. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish the element from other elements in question, and may refer to elements in other aspects (e.g., importance or order) is not limited. It is said that one (eg, first) component is "coupled" or "connected" to another (eg, second) component, with or without the terms "functionally" or "communicatively". When referenced, it means that one component can be connected to the other component directly (eg by wire), wirelessly, or through a third component.

The term “module” used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as, for example, logic, logic block, component, or circuit. can be used as A module may be an integrally formed part or a minimum unit or a part of the part that performs one or more functions. For example, according to an embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

According to various embodiments of the present document, one or more instructions stored in a storage medium (eg, internal memory 136 or external memory 138) readable by a machine (eg, electronic device 101) may be implemented as software (eg, the program 140) including For example, a processor (eg, processor 120 ) of a device (eg, electronic device 101 ) may call at least one command among one or more commands stored from a storage medium and execute it. This makes it possible for the device to be operated to perform at least one function according to the called at least one command. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' only means that the storage medium is a tangible device and does not include a signal (eg, electromagnetic wave), and this term is used in cases where data is semi-permanently stored in the storage medium and It does not distinguish between temporary storage cases.

According to an embodiment, the method according to various embodiments disclosed in this document may be included and provided in a computer program product. Computer program products may be traded between sellers and buyers as commodities. The computer program product is distributed in the form of a machine-readable storage medium (eg compact disc read only memory (CD-ROM)), or via an application store (eg Play Store ^TM ) or on two user devices ( It can be distributed (eg downloaded or uploaded) directly between smartphones (eg: smartphones) and online. In the case of online distribution, at least a part of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium such as a memory of a server of a manufacturer, a server of an application store, or a relay server.

According to various embodiments, each component (eg, module or program) of the above-described components may include a singular or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. there is. According to various embodiments, one or more components or operations among the above-described corresponding components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (eg, a module or a program) may be integrated into one component. In this case, the integrated component may perform one or more functions of each component 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, operations performed by a module, program, or other component are executed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations are executed in a different order, or omitted. or one or more other operations may be added.

2 is a block diagram 200 of a power management module (eg, 188) and a battery (eg, 189), according to various embodiments. Referring to FIG. 2 , the power management module 188 may include a charging circuit 210 , a power regulator 220 , or a fuel gauge 230 . The charging circuit 210 may charge the battery 189 using power supplied from an external power source for the electronic device 101 . According to an embodiment, the charging circuit 210 may include a type of external power source (eg, a power adapter, USB or wireless charging), a size of power that can be supplied from the external power source (eg, about 20 watts or more), or a battery 189 ), a charging method (eg, normal charging or fast charging) may be selected based on at least some of the properties, and the battery 189 may be charged using the selected charging method. The external power source may be connected by wire through a connection terminal (eg, 178 ) or wirelessly through an antenna module (eg, 197 ).

The power regulator 220 may generate a plurality of powers having different voltages or different current levels by adjusting the voltage level or current level of power supplied from the external power source or the battery 189 . The power regulator 220 may adjust the external power source or the power of the battery 189 to a voltage or current level suitable for each of the components included in the electronic device 101 . According to an embodiment, the power regulator 220 may be implemented in the form of a low drop out (LDO) regulator or a switching regulator.

The fuel gauge 230 may measure usage state information of the battery 189 (eg, battery capacity, number of times of charging and discharging, voltage, or temperature).

Power management module 188, for example, using charging circuit 210, voltage regulator 220, or fuel gauge 230, based at least in part on the measured usage state information of the battery 189 determining state of charge information related to charging (eg, lifespan, overvoltage, undervoltage, overcurrent, overcharge, overdischarge, overheating, short circuit, or swelling), and based at least in part on the determined state of charge information, the battery After determining whether the abnormal state or the normal state of 189 is determined, when the abnormal state is determined, charging of the battery 189 may be adjusted (eg, reduced charging current or voltage, or charging stopped). According to , at least some of the functions of the power management module 188 may be performed by an external control device (eg, the processor 120 ).

Battery 189 may include, for example, a battery protection circuit module (PCM) 240 . The battery protection circuit 240 may perform various functions (eg, a pre-blocking function) to prevent deterioration or burnout of the battery 189 . The battery protection circuit 240 is additionally or in alternative to, a battery management system (BMS) for balancing cells, measuring the capacity of a battery, measuring the number of times of charging and discharging, measuring a temperature, or measuring a voltage ))).

According to an embodiment, at least a portion of the use state information or the charge state information of the battery 189 may include a corresponding sensor (eg, temperature) among the fuel gauge 230 , the power management module 188 , or the sensor module 176 . sensor) can be used. In this case, according to an embodiment, the corresponding sensor (eg, a temperature sensor) of the sensor module 176 is included as a part of the battery protection circuit 240 or is a separate device adjacent to the battery 189 . can be placed in

3 is a block diagram illustrating a wireless charging system 300 according to various embodiments.

Referring to FIG. 3 , a wireless charging system 300 according to various embodiments is a wireless power transmitter (hereinafter, referred to as a power transmitter 302) or a wireless power receiver (hereinafter, a power receiver 301). ) may be included. When the power receiving device 301 is mounted on the transmitting coil 321L of the power transmitting device 302, the power transmitting device 302 may wirelessly supply power to the power receiving device 301 through the transmitting coil 311L. there is.

In various embodiments of the present document, the power transmission device 302 may be the same or similar to the electronic device 101 illustrated in FIG. 1 . The power receiving device 301 may be an external device from the viewpoint of the power transmitting device 302 , for example, may be the same as or similar to the electronic device 102 illustrated in FIG. 1 .

In various embodiments of this document, the power receiving device 301 may be the same as or similar to the electronic device 101 illustrated in FIG. 1 . The power transmitting device 302 may be an external device from the viewpoint of the power receiving device 301 , and may be, for example, the same as or similar to the electronic device 102 illustrated in FIG. 1 .

According to various embodiments, the power transmission device 302 (eg, the electronic device 101 of FIG. 1 ) includes a power transmission circuit 311 , a control circuit 312 (eg, the processor 120 of FIG. 1 ); It may include a communication circuit 313 (eg, the communication module 190 of FIG. 1 ) or a sensing circuit 314 (eg, the sensor module 176 of FIG. 1 ).

According to various embodiments, the power transmission circuit 311 receives power (or power) from the outside, and the power adapter 311a converts the voltage of the input power, the power generation circuit 311b generates power, or A matching circuit 311c for increasing the efficiency between the transmitting coil 311L and the receiving coil 321L may be included.

According to various embodiments, the power transmission circuit 311 may include a power adapter 311a and a power generation circuit to transmit power to a plurality of power reception devices (eg, a first power reception device and a second power reception device). A plurality of 311b, a transmitting coil 311L, or a matching circuit 311c may be included.

According to various embodiments, the control circuit 312 may perform overall control of the power transmission device 302 , and may generate various messages required for wireless power transmission and transmit it to the communication circuit 313 . In an embodiment, the control circuit 312 may calculate power (or amount of power) to be transmitted to the power receiving device 301 based on information received from the communication circuit 313 . In an embodiment, the control circuit 312 may control the power transmission circuit 311 to transmit power generated by the transmission coil 311L to the power reception device 301 .

According to various embodiments, the communication circuit 313 may include at least one of a first communication circuit 313a or a second communication circuit 313b. The first communication circuit 313a communicates with the first communication circuit 323a of the power receiving device 301 using, for example, a frequency that is the same as or adjacent to a frequency used for power transmission in the transmitting coil 311L. can (Example: in-band method)

The first communication circuit 313a may communicate with the first communication circuit 323a of the power receiving device 301 using the transmitting coil 311L. Data (or communication signal) generated by the first communication circuit 313a may be transmitted using the transmission coil 311L. The first communication circuit 313a may transmit data to the power receiving device 301 using a frequency shift keying (FSK) modulation technique. According to various embodiments, the first communication circuit 313a may communicate with the first communication circuit 323a of the power receiving device 301 by changing the frequency of the power signal transmitted through the transmitting coil 311L. can Alternatively, the first communication circuit 313a may communicate with the first communication circuit 323a of the power receiving device 301 by allowing data to be included in the power signal generated by the power generating circuit 311b. For example, the first communication circuit 313a may express data by increasing or decreasing the frequency of the power transmission signal.

The second communication circuit 313b may communicate with the second communication circuit 323b of the power receiving device 301 using, for example, a frequency different from the frequency used for power transmission by the transmitting coil 311L. (eg outband method). For example, the second communication circuit 313b uses any one of various short-range communication methods such as Bluetooth, Bluetooth low energy (BLE), Wi-Fi, and/or near field communication (NFC). 2 Information related to the state of charge from the communication circuit 323b (eg, voltage value after rectifier, rectified voltage value (eg, Vrect) information, current information flowing from the coil 321L or the rectifier circuit 321b (eg, load current) , Iout), various packets, and/or messages).

According to various embodiments, the sensing circuit 314 may include at least one or more sensors, and may sense at least one state of the power transmitter 301 by using the at least one or more sensors.

According to various embodiments, the sensing circuit 314 may include at least one of a temperature sensor, a motion sensor, and a current (or voltage) sensor, and use the temperature sensor to detect a temperature state of the power transmitter 302 . The state of the output signal of the power transmitter 302 may be detected using a motion sensor, and the state of the output signal of the power transmitter 302 may be detected using a current (or voltage) sensor, for example, a current It can sense magnitude, voltage magnitude, or power magnitude.

According to an embodiment, the current (or voltage) sensor may measure a signal in the power transmission circuit 311 . The current (or voltage) sensor may measure a signal in at least a portion of the matching circuit 311c or the power generating circuit 311b. For example, the current (or voltage sensor) may include a circuit for measuring a signal at the front end of the coil 311L.

According to various embodiments, the sensing circuit 314 may be a circuit for detecting a foreign object (eg, foreign object detection (FOD)).

According to various embodiments, the power receiving device 301 (eg, the electronic device 101 of FIG. 1 ) includes a power receiving circuit 321 (eg, the power management module 188 of FIG. 1 ) and a processor 322 . (eg, processor 120 of FIG. 1 ), communication circuitry 323 (eg, communication module 190 of FIG. 1 ), at least one sensor 324 (eg, sensor module 176 of FIG. 1 ); , or a sensing circuit 326 may be included. The power receiving device 301 may be the same or similar electronic device as the power transmitting device 302 , and in various embodiments of the present document, only components that are different in the power receiving device 301 will be described.

According to various embodiments, the power receiving circuit 321 includes a receiving coil 321L that wirelessly receives power from the power transmitting device 302 , a charging circuit (eg, a PMIC, a charger, a switched capacitor, or a voltage divider) ( 321d) (eg, the charging circuit 210 of FIG. 2 ), or a battery 321e (eg, the battery 189 ). In one embodiment, the power receiving circuit 321 includes a matching circuit 321a connected to the receiving coil 321L, a rectifying circuit 321b for rectifying the received AC power to DC, or a regulating circuit for adjusting the charging voltage (eg, : LDO) 321c may be further included.

According to various embodiments, the processor 322 may perform overall control of the power receiving device 301 , generate various messages required for wireless power reception, and transmit the generated messages to the communication circuit 323 .

According to various embodiments, the communication circuit 323 may include at least one of a first communication circuit 323a or a second communication circuit 323b. The first communication circuit 323a may communicate with the power transmission device 302 through the reception coil 321L.

The first communication circuit 323a may communicate with the first communication circuit 313a using the receiving coil 321L. Data (or communication signal) generated by the first communication circuit 323a may be transmitted using the receiving coil 321L. The first communication circuit 323a may transmit data to the power transmitter 302 using an amplitude shift keying (ASK) modulation technique. The second communication circuit 323b may communicate with the power transmission device 302 using any one of various short-range communication methods such as Bluetooth, BLE, Wi-Fi, and/or NFC.

In various embodiments of the present document, the packet, information, or data transmitted and received between the power transmitting device 302 and the power receiving device 301 is transmitted through at least one of the first communication circuit 323a or the second communication circuit 323b. Available.

According to various embodiments, the at least one sensor 324 may include at least some of a current/voltage sensor, a temperature sensor, an illuminance sensor, or an acceleration sensor. In one embodiment, the at least one sensor 324 may be the same or a separate component from the sensor module 176 of FIG. 1 .

According to various embodiments, the display 325 may display various types of information required for wireless power transmission/reception.

According to various embodiments, the sensing circuit 326 may detect the power transmitter 302 by sensing a discovery signal or power received from the power transmitter 302 . The sensing circuit 326 is a signal of the input/output terminal of the coil 321L, the matching circuit 321a, or the rectifying circuit 321b by the coil 321L signal generated by the signal output from the power transmitter 302 . change can be detected. According to various embodiments, the sensing circuit 326 may be included in the receiving circuit 321 .

4 is an operation flowchart 400 of a wireless charging system (eg, the wireless charging system 300 of FIG. 3 ).

In the illustrated example, at least some of operations 420 to 470 may be omitted. For example, when one-way communication is performed within the wireless charging system 300, operation 440 may be omitted.

The operations shown in FIG. 4 are performed by a control circuit (eg, the control circuit 312 of FIG. 3 ) of the power transmission device (eg, the power transmission device 302 of FIG. 3 ), or the power receiving device (eg: It may be performed by a processor (eg, the processor 322 of FIG. 3 ) of the power receiving apparatus 301 of FIG. 3 . For example, the memory of the power transmission device 302 (eg, the memory 130 of FIG. 1 ) may, when executed, include instructions that cause the control circuit 312 to perform at least some operations illustrated in FIG. 4 . instructions) can be stored. For example, the memory (eg, the memory 130 of FIG. 1 ) of the power receiving device 301 may store instructions that, when executed, cause the processor 322 to perform at least some operations illustrated in FIG. 4 . there is.

In operation 420 , the power transmitting device 302 may determine whether an object (eg, the power receiving device 301 , a key, or a coin) exists in the sensing area. The sensing area may be an area in which an object within the corresponding area may affect power transmission of the power transmitting device 302 . For example, the sensing region may be an interface surface of the power transmitter 302 in the inductive coupling method, and may be an area within a range through which power may be transmitted in the resonant coupling method. For example, the power transmission device 302 may detect a change in the amount of power generated in the power transmission circuit (eg, the power transmission circuit 311 of FIG. 3 ) to determine whether an object exists within a predetermined range. For example, the power transmitting device 302 may identify an object by detecting that one or more of a frequency, a current, or a voltage of the power transmitting circuit 311 is changed. The power transmitter 302 may, for example, distinguish the power receiver 301 from objects that cannot receive power wirelessly (eg, a key or a coin) among objects within the detection area.

The power transmitter 302 may perform operation 430 upon detecting the power receiver 301 . If the power transmitter 302 fails to detect the power receiver 301 while a certain time has elapsed or the search is repeated a certain number of times, the power transmitter 302 may not perform operation 430 until the object placed on the surface of the interface is removed. there is.

In operation 430 , according to an embodiment, the power transmitter 302 may transmit a power signal for searching for the power receiver 301 to the power receiver 301 . For example, the power signal may include power for activating the power receiving device 301 or at least one component included in the power receiving device 301 . The power signal may be, for example, a signal generated by applying a power signal of a selected operating point for a selected time. The operating point may be defined by a frequency, a duty cycle, or an amplitude of a voltage applied to the power transmission circuit 311 .

In operation 435 , the power receiver 301 may transmit a response signal to the search signal in operation 430 to the power transmitter 302 . For example, the power receiving device 301 may transmit data related to a strength of a received power signal or a power receiving state to the power transmitting device 302 in response to the search signal. The strength of the power signal may indicate the power reception power strength. Alternatively, the strength of the power signal may indicate a degree of coupling or resonant coupling for power transmission between the power transmitting device 302 and the power receiving device 301 . The power transmitter 302 may determine that the power receiver 301 has not been found, for example, when there is no response to the externally transmitted power signal. For example, when the power transmitter 302 does not find the power receiver 301 capable of transmitting power, the power transmitter 302 may perform operation 420 again.

In operation 440 , the power transmitter 302 may request identification information of the power receiver 301 and/or configuration information related to wireless charging. For example, the identification information may include version information, a manufacturing code, or a basic device identifier. The setting information may include, for example, a wireless charging frequency, a maximum chargeable power, a required amount of power to be charged, or an average amount of transmitted power.

According to various embodiments, the power transmitter 302 may transmit identification information of the power transmitter and/or information related to wireless charging to the power receiver 301 . For example, it can transmit data related to the wireless charging power or mode that can be supplied.

In operation 445 , the power receiving device 301 may transmit identification information and/or setting information to the power transmitting device 302 . The power transmitting device 302 may generate a power transfer contract used for power charging with the power receiving device 301 based at least in part on the received identification information and/or setting information.

According to an embodiment, the power transfer protocol may include parameters that determine a power transfer characteristic in a power transfer state. The parameters are applied to the version information of the power transmission protocol, identification information of the power receiving device 301 or manufacturer, power class, maximum power information, option setting, time information for average received power, or a coil of the power transmitting device 302 . It may include information used to determine or determine the voltage or current of the signal being made.

According to various embodiments, the direction of the request for identification information and/or setting information related to wireless charging may be variously modified, for example, the opposite of the above example. For example, the power transmitting device 302 transmits identification information of the power transmitting device 302 and/or setting information related to wireless charging to the power receiving device 301, and then the power receiving device 301 is charged A request for changing the amount of power may be transmitted to the power transmitter 302 . According to various embodiments, the power receiving device 301 requests identification information and/or wireless charging-related setting information from the power transmitting device 302 , and the power receiving device 301 obtains from the power transmitting device 302 . Based on one piece of information, a control signal (or control command) of the amount of charging power may be transmitted to the power transmission device 302 , and the power transmission device 302 may adjust the amount of charging power based on the control signal.

In operation 450 , the power transmitter 302 may transmit power to the power receiver 301 . For example, the power transmitter 302 may transmit power to the power receiver 301 based on a power transfer protocol. The power transmitter 302 may transmit, for example, a power signal having a resonance frequency of about 110 to 190 kHz to the power receiver 301 .

In operation 460 , the power receiving device 301 may transmit a control signal to the power transmitting device 302 while receiving power from the power transmitting device 302 . For example, the power receiving device 301 may transmit a control signal for transmitting the power receiving state to the power transmitting device 302 at regular intervals. A control signal for increasing or decreasing the power of a signal supplied to the power receiving device 301 may be transmitted to the power transmitting device 302 . When charging of the battery is completed, the power receiving device 301 may transmit a control signal requesting to stop wireless power transmission to the power transmitting device 302 . The control signal is, for example, a transmission power amount control signal (or power amount change signal), a control error signal, a received power signal, a charge status signal, or power transmission. It may include at least one of an end power transfer signal.

According to an embodiment, the control error signal may include a header indicating a control error and a message including a control error value. The power receiving device 301 may set the control error value to 0 (zero), for example, when the power received from the power transmitting device 302 is within a selected range in operation 450 . The power receiving apparatus 301 may set the control error value to a negative value, for example, when the received power exceeds a selected range. The power receiving apparatus 301 may set the control error value to a positive value, for example, when the received power is less than a selected range. The power transfer end signal may include, for example, a power transfer abort code indicating the reason for the interruption. For example, the power transfer abort code may include charge complete, internal fault, over temperature, over voltage, over current, battery failure, reset ( reconfigure), no response, or unknown error.

In operation 470 , the power transmission device 302 may adjust the amount of transmission power applied to the power transmission circuit 311 based on a feedback control signal (eg, a control error value) received from the power reception device 301 . there is.

According to one embodiment, the power transmission device 302 is the frequency of the signal applied to the power transmission circuit 311 when the received feedback control signal includes information requesting to adjust the power of the power signal of the power signal; The transmit power can be adjusted by varying the duty cycle, or amplitude. For example, the power transmission device 302 increases the frequency of the signal applied to the power transmission circuit 311 or decreases the duty cycle in response to the down control signal requesting to decrease the power of the power signal. Alternatively, the transmit power may be lowered by lowering the voltage or lowering the amplitude. For example, the power transmission device 302 lowers the frequency of the signal applied to the power transmission circuit 311 or increases the duty cycle in response to a rising control signal requesting to increase the power of the power signal. Alternatively, the transmit power may be increased by lowering the voltage or increasing the amplitude.

According to an embodiment, the power transmission device 302 may end power transmission to the power reception device 301 when the received control signal includes information indicating completion of charging. The power transmitter 302 may perform operation 420 again after terminating the power transmission.

An electronic device (eg, the power receiving device 301 of FIG. 5 ) wirelessly receiving power from an external device (eg, the power transmitting device 302 of FIG. 5 ) according to various embodiments of the present disclosure includes a battery ( Example: the battery 321e of FIG. 3 ), a receiving coil (eg, the receiving coil 321L of FIG. 3 ), and a first switch electrically connected to one end of the receiving coil 321L (eg, fifth in FIG. 5 ) switch S1), a second switch electrically connected to the one end of the receiving coil 321L and connected in series with the first switch S1 (eg, the sixth switch S2 in FIG. 5), the A third switch (eg, the seventh switch S3 of FIG. 5 ) electrically connected to the other end of the receiving coil 321L, and the third switch S3 electrically connected to the other end of the receiving coil 321L ) and a rectifier circuit (eg, the rectifier circuit 540 of FIG. 5 ) including a fourth switch (eg, the eighth switch S4 of FIG. 5 ) connected in series, the voltage rectified from the rectifier circuit 540 a charger (eg, the charger 570 of FIG. 5 ) and a processor (eg, the processor 322 of FIG. 3 ) for supplying the system of the electronic device 301 and the battery 321e, the processor 322, detects a load current supplied to the charger 570, and when the load current is lower than a specified first reference current, a first request to lower the power of the power signal to less than the specified first power A command signal is transmitted to the external device 302, and when a drop of the rectified voltage is detected, any one of the first to fourth switches S1, S2, S3, and S4 is continuously activated, The rectifier circuit 540 may be driven as a voltage multiplier circuit.

According to an embodiment, the processor 322 checks whether the load current is lower than a specified second reference current while the rectifier circuit 540 is driven by the voltage multiplier circuit, and the load current is set to the second reference current. When it is lower than the 2 reference current, the target voltage is set to a second target voltage that is higher than the currently set first target voltage by a specified magnification, and a second command signal for increasing the power of the power signal is transmitted to the external device 302 . and the second reference current may be smaller than the first reference current.

According to an embodiment, the processor 322 may set the specified magnification to 40% to 60%.

According to an embodiment, after transmitting the second command signal to the external device 302 , the processor 322 checks whether the rectified voltage reaches the second target voltage, and the rectified voltage When the second target voltage is reached, the operation of continuously activating any one of the first to fourth switches S1, S2, S3, and S4 may be stopped.

According to an embodiment, the processor 322 sets the target voltage to the third target voltage after stopping the operation of driving the rectifier circuit 540 as a voltage multiplier circuit, and A third command signal including the target voltage may be transmitted to the external device 302 .

According to an embodiment, the first to fourth switches S1 , S2 , S3 , and S4 are metal-oxide semiconductor field effect transistors (MOSFETs), and the processor 322 includes the first switch S1 . ) to the body diode characteristics of the fourth switch S4 may be used to rectify the power signal.

According to an embodiment, the processor 322 may charge the battery 321e using a constant voltage (CV) method during a period in which the load current is lower than the first reference current.

According to an embodiment, when the rectified voltage starts to drop after transmitting the first command signal, the processor 322 may determine that the external device 302 has switched to the half-bridge mode.

According to an embodiment, the processor 322 may drive the rectifier circuit 540 as a voltage multiplier circuit based on determining that the external device 302 has switched to the half-bridge mode.

In the method of driving an electronic device 301 that wirelessly receives power from an external device 302 according to various embodiments of the present disclosure, the electronic device 301 includes a battery 321e and a receiving coil 321L. , a rectifying circuit 540 electrically connected to the receiving coil 321L, communicating with the external device 302 through the receiving coil 321L, and controlling the rectifying circuit 540 to control the receiving coil 321L ) a processor 322 for rectifying the power signal of the external device 302 received through, a voltage adjustment circuit 321c for adjusting the rectified voltage rectified by the rectifier circuit 540 to a specified voltage, and the specified and a charger (570) for supplying a voltage to the system of the electronic device (301) and the battery (321e), wherein the method includes: sensing a load current supplied to the charger (570), the load current is When it is lower than the specified first reference current, the operation of transmitting a first command signal requesting to lower the power of the power signal to less than the specified first power to the external device 302, and detecting a drop in the rectified voltage continuously activating any one of the first to fourth switches S1 , S2 , S3 , and S4 to drive the rectifier circuit 540 as a voltage multiplier circuit.

According to an embodiment, while the rectifier circuit 540 is driven by the voltage multiplier circuit, checking whether the load current is lower than a specified second reference current, if the load current is lower than the second reference current , setting the target voltage to a second target voltage that is higher than the currently set first target voltage by a specified magnification, and transmitting a second command signal for increasing the power of the power signal to the external device 302, and , the second reference current may be smaller than the first reference current.

According to an embodiment, the method may further include setting the specified magnification to 40% to 60%.

According to an embodiment, after transmitting the second command signal to the external device 302 , checking whether the rectified voltage reaches the second target voltage, and the rectified voltage is set to the second target The method may further include stopping the operation of continuously activating any one of the first to fourth switches S1, S2, S3, and S4 when the voltage is reached.

According to an embodiment, after stopping the operation of driving the rectifier circuit 540 as the voltage multiplier circuit, setting the target voltage to the third target voltage, and a third target voltage including the third target voltage 3 The method may further include transmitting a command signal to the external device 302 .

According to an embodiment, the first switch S1 to the fourth switch S4 are metal-oxide semiconductor field effect transistors (MOSFETs), and the first switch S1 to the fourth switch S4 may be The method may further include rectifying the power signal using body diode characteristics.

The method may further include charging the battery 321e using a constant voltage (CV) method during a period in which the load current is lower than the first reference current.

According to an embodiment, the method may further include determining that the external device 302 has switched to a half-bridge mode when the rectified voltage starts to drop after transmitting the first command signal.

According to an embodiment, the method may further include driving the rectifier circuit 540 as a voltage multiplier circuit based on determining that the external device 302 has switched to the half-bridge mode.

An electronic device (eg, the power transmission device 302 of FIG. 5 ) for wirelessly transmitting power according to various embodiments of the present disclosure includes a power source (eg, the power supply circuit 520 of FIG. 5 ), a transmission coil 311L ), a full-bridge inverter 510 electrically connected to the power source and the transmitting coil 311L, and a control circuit for controlling the full-bridge inverter 510 to transmit a power signal through the transmitting coil 311L (eg: The control circuit 312 of FIG. 3), and a processor (eg, the processor 120 of FIG. 1), wherein the full-bridge inverter 510 is electrically connected to one end of the transmitting coil 311L and the A first switch (eg, the first switch Q1 of FIG. 5 ) turned on in response to a first gate signal of the transmission control circuit 312 is electrically connected to the one end of the transmission coil 311L and controls the transmission A second switch (eg, the second switch Q2 of FIG. 5 ) turned on in response to the second gate signal of the circuit 312 is electrically connected to the other end of the transmission coil 311L and the transmission control circuit 312 ) of a third switch (eg, the third switch Q3 of FIG. 5 ) turned on in response to a third gate signal of ), and the other end of the transmitting coil 311L and electrically connected to the transmission control circuit 312 a fourth switch (eg, a fourth switch Q4 of FIG. 5 ) turned on in response to a fourth gate signal of activating Q3) and deactivating the second switch Q2 and the fourth switch Q4, and deactivating the first switch Q1 and the third switch Q3 and the second switch Q2 and an external device that controls the full-bridge inverter 510 to operate in a full-bridge mode alternately activating the fourth switch Q4, and receives the power signal while operating in the full-bridge mode (Example: the power receiving device 30 of FIG. 1))) in response to receiving a first command signal requesting to lower the power of the power signal to less than a specified first power, the first through the fourth switches Q1, Q2, Q3, Q4 Controls the full-bridge inverter 510 to operate in a half-bridge mode in which only two switches selected from among are alternately turned on, and the power of the power signal from the external device 301 while operating in the half-bridge mode In response to receiving a second command signal requesting to increase by a specified magnification, the power of the power signal may be changed to a value corresponding to the specified magnification.

According to an embodiment, the processor 120 operates in the full bridge mode, and while controlling the duty cycle of each of the first gate signal to the fourth gate signal to have a threshold duty cycle, the first command signal , and in response to the first command signal, it is possible to control the full-bridge inverter 510 to operate in the half-bridge mode.

5 is a circuit configuration diagram of a wireless charging system according to various embodiments of the present invention.

The wireless charging system shown in FIG. 5 may include an embodiment that is at least partially similar to or different from the wireless charging system 300 described with reference to FIG. 3 . Hereinafter, with reference to FIG. 5 , only parts not described or changed in FIG. 3 will be described.

Referring to FIG. 5 , the wireless charging system 300 according to various embodiments may include a power transmitting device 302 and a power receiving device 301 .

The power transmission device 302 may include a power supply circuit 520 , a full bridge inverter 510 , a transmission coil 311L, and a Tx control circuit 530 (eg, the control circuit 312 of FIG. 3 ). there is.

According to an embodiment, the power circuit 520 (eg, the power adapter 311a of FIG. 3 ) may include power input from an external device (eg, travel adapter) or a battery (not shown) included in the power transmission device 302 . ) may be used to supply a power signal having a specified voltage (eg, about 3V to 14V) to the transmitting coil 311L through the full-bridge inverter 510 .

According to an embodiment, the full-bridge inverter 510 switches the power signal supplied from the power circuit 520 and supplies the first to fourth switches Q1, Q2, Q3, and Q4 to the transmitting coil 311L. may include The full-bridge inverter 510 is turned on or turned off in response to the first gate signal to the fourth gate signal Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV output from the Tx control circuit 530 , so that the frequency of the power signal or the power signal The duty cycle of can be adjusted.

In the illustrated example, the first to fourth switches Q1, Q2, Q3, and Q4 are defined as n-type metal oxide silicon field effect transistors (MOSFETs), but the first to fourth switches Q1, Q2, Q3 and Q4) may be p-type MOSFETs.

The first switch Q1 and the second switch Q2 of the full-bridge inverter 510 may be electrically connected to one end n1 of the transmitting coil 311L.

The first switch Q1 includes a gate receiving the first gate signal Q1_DRV output from the Tx control circuit 530 , a drain connected to a first electrode (eg, anode) of the power circuit 520 , and a transmission It may include a source connected to one end n1 of the coil 311L. According to an embodiment, the first switch Q1 is turned on in response to the first gate signal Q1_DRV output from the Tx control circuit 530 , and is connected to the first electrode (eg, positive electrode) of the power circuit 520 . One end n1 of the transmitting coil 311L may be electrically connected.

The second switch Q2 may be connected in series with the first switch Q1. The second switch Q2 includes a gate receiving the second gate signal Q2_DRV output from the Tx control circuit 530 , a drain connected to one end n1 of the transmitting coil 311L, and a power supply circuit 520 . It may include a source connected to the second electrode (eg, a cathode). According to an embodiment, the second switch Q2 is turned on in response to the second gate signal Q2_DRV output from the Tx control circuit 530 , and is connected to the second electrode (eg, negative electrode) of the power circuit 520 . One end n1 of the transmitting coil 311L may be electrically connected.

The third switch Q3 and the fourth switch Q4 of the full-bridge inverter 510 may be electrically connected to the other end n2 of the transmitting coil 311L.

The third switch Q3 includes a gate receiving the third gate signal Q3_DRV output from the Tx control circuit 530 , a drain connected to the other end n2 of the transmitting coil 311L, and a power supply circuit 520 . It may include a source connected to the second electrode (eg, a cathode). According to an embodiment, the third switch Q3 is turned on in response to the third gate signal Q3_DRV output from the Tx control circuit 530 , and is connected to the second electrode (eg, negative electrode) of the power circuit 520 . The other end n2 of the transmitting coil 311L may be electrically connected.

The fourth switch Q4 may be connected in series with the third switch Q3 . The fourth switch Q4 includes a gate receiving the fourth gate signal Q4_DRV output from the Tx control circuit 530 , a drain connected to the first electrode (eg, anode) of the power circuit 520 , and a transmission It may include a source connected to the other end n2 of the coil 311L. According to an embodiment, the fourth switch Q4 is turned on in response to the fourth gate signal Q4_DRV output from the Tx control circuit 530 , and is connected to the first electrode (eg, positive electrode) of the power circuit 520 . The other end n2 of the transmitting coil 311L may be electrically connected.

The power transmission device 302 may further include a first capacitor C1 connected in series with one end n1 of the transmission coil 311L. The first capacitor C1 may form a resonance network for wirelessly transmitting power together with the transmission coil 311L.

The power transmitter 302 detects a change in the amplitude of the power signal through one end n1 of the transmitting coil 311L or the other end n2 of the transmitting coil 311L through the demodulation circuit 531, It may communicate with the power receiving device 301 . For example, the power receiver 301 may transmit data to the power transmitter 302 using an amplitude shift keying (ASK) modulation technique, and the power transmitter 302 receives the data from the power receiver 301 . The data to be used may include at least one data defined in a wireless charging standard (eg, wireless power consortium (WPC)), such as a control signal, identification information, and/or configuration information.

The power receiving device 301 includes a receiving coil 321L for wirelessly receiving power, an Rx control circuit 550 (eg, the processor 322 of FIG. 3 ), and a rectifying circuit electrically connected to the receiving coil 321L. 540 , a regulation circuit 560 that adjusts the voltage rectified by the rectifier circuit 540 (eg, regulation circuit 321c in FIG. 3 ), and a charger 570 (eg, charging circuit 321d in FIG. 3 ). )) may be included.

The power receiving device 301 may further include a second capacitor C2 connected in series with one end n3 of the receiving coil 321L. The second capacitor C2 may form a resonance network for wirelessly receiving power together with the receiving coil 321L. According to an embodiment, the power receiving device 301 includes a third capacitor C3 disposed between one end n3 and the other end n4 of the receiving coil 321L, an output end n5 of the rectifying circuit 540 and It may further include a fourth capacitor C4 disposed between the ground, and a fifth capacitor C5 disposed between the output terminal of the adjustment circuit 560 and the ground.

According to an embodiment, the rectifying circuit 540 includes a fifth switch to eighth switches S1, S2, S3, and S4 for rectifying the power signal received through the receiving coil 321L, and the fifth switch to The eighth switches S1, S2, S3, and S4 may be connected in the form of a full bridge.

According to an embodiment, the fifth to eighth switches S1, S2, S3, and S4 may be implemented as a metal oxide silicon field effect transistor (MOSFET), and the receiving coil ( 321L) can rectify the received power signal. For example, the rectifying operation may include rectifying the power signal with a synchronous rectifier operation of activating a gate of the MOSFET in association with a current flowing in the MOSFET in a direction in which the body diode is turned on.

In the illustrated example, the fifth to eighth switches S1 , S2 , S3 , and S4 are illustrated in the form of diodes for convenience of description.

According to an exemplary embodiment, the fifth switch S1 and the sixth switch S2 of the rectifying circuit 540 are electrically connected to one end n3 of the receiving coil 321L, and the seventh of the rectifying circuit 540 . The switch S3 and the eighth switch S4 may be electrically connected to the other end n4 of the receiving coil 321L.

According to an embodiment, the Rx control circuit 550 may include a mode control module 552 , a comparator 551 , and a modulation circuit 553 .

The mode control module 552 may determine the target voltage based on sensing the rectified voltage Vout and/or the load current supplied to the adjustment circuit 560 . The mode control module 552 may generate a voltage multiplier circuit control signal (eg, the voltage multiplier circuit control signal V_DBL of FIG. 9 ) for driving the rectifier circuit as a voltage multiplier circuit based on the load current.

According to the illustrated example, the voltage multiplier circuit control signal (eg, the voltage multiplier circuit control signal V_DBL of FIG. 9 ) generated from the mode control module 552 always turns on the switch S2-1 shown in FIG. 5 ( continuous turn-on). However, the switch S2-1 shown in FIG. 5 is a component inserted for convenience of description, and the rectifier circuit 540 may not include the switch S2-1. For example, the voltage multiplier circuit control signal (eg, the voltage multiplier circuit control signal V_DBL of FIG. 9 ) generated from the mode control module 552 may include the fifth to eighth switches included in the rectifier circuit 540 . It may be defined as a signal for always turning on any one of (S1, S2, S3, S4).

The comparator 551 may compare the rectified voltage with the target voltage generated by the mode control module 552 and generate the comparison value as an error value.

The modulation circuit 553 may generate an amplitude control signal for controlling the amplitude of the power signal based on the error value generated from the comparator 551 . For example, the amplitude control signal may be a signal for controlling the amplitude control circuits S5, S6, C7, and C8 electrically connected to one end and the other end of the receiving coil. For example, the amplitude control circuits S5, S6, C7, and C8 include a first amplitude control switch S6 for switching the connection between one end n3 of the receiving coil 321L and the ground, and the other end of the receiving coil 321L. A second amplitude control switch (S5) for switching the connection between (n4) and the ground, a sixth capacitor (C6) and a second amplitude control switch (S5) disposed between the other end (n4) of the receiving coil (321L) and the second amplitude control switch (S5) A seventh capacitor C7 disposed between the first amplitude control switch S6 and one end n3 of the receiving coil 321L may be included.

According to an embodiment, the power receiver 301 performs amplitude shift keying (ASK) modulation by the modulation circuit 553 controlling the amplitude control circuits S5, S6, C7, and C8, and transmits power. It may pass data to the device 302 . According to an embodiment, the data received by the power transmitting device 302 from the power receiving device 301 is, such as a control signal, identification information, and/or setting information, a wireless charging standard (eg, a wireless power consortium (WPC) )) may include at least one data defined in .

According to an embodiment, the data that the power transmitter 302 receives from the power receiver 301 may include data related to a request to lower the power transmitted by the power transmitter 302 . According to an embodiment, the data that the power transmission device 302 receives from the power reception device 301 may include data requesting the power transmission device 302 to switch from the full-bridge mode to the half-bridge mode. . For example, when a specified condition (or a specified event) is satisfied, the power receiving device 301 controls the amplitude control circuits S5, S6, C7, and C8 by the modulation circuit 553 to control the amplitude shift (ASK). keying), the command data may be transmitted to the power transmitter 302 by performing modulation. In response to receiving the data, the power transmitter 302 may switch from a state of operating in a full-bridge mode to a state of operating in a half-bridge mode.

In the above, the full-bridge mode and the half-bridge mode of the power transmitter 302 will be defined and described in detail with reference to FIG. 8 .

The power signal rectified by the rectification circuit 540 may be adjusted to a voltage specified by the adjustment circuit 560 . The power signal rectified by the rectifying circuit 540 may be defined as a “rectified voltage (Vout or Vrect)”.

According to an embodiment, the charger 570 charges a battery (eg, the battery 321e of FIG. 3 ) using the rectified voltage or at least of the system of the power receiving device 301 (eg, the power receiving device 301 ). One component) can supply the necessary voltage.

According to an embodiment, the charger 570 may perform CC (constant current) charging and CV (constant voltage) charging when charging the battery 321e. CC charging may be defined as a charging method in which the battery 321e is charged using a constant current until the voltage of the battery 321e reaches a specified voltage (eg, a fully charged voltage). CV charging is a method of charging the battery 321e using a constant voltage. After the voltage of the battery 321e reaches a specified voltage, charging that lowers the supply current (eg, load current) until the battery 321e is fully charged can be defined in this way.

6 is an example of gate signals for controlling the full-bridge inverter 510 of the power transmission device 302 according to various embodiments of the present disclosure.

In the illustrated example, Q1_DRV may be defined as a first gate signal Q1_DRV for controlling the first switch Q1 of the full-bridge inverter 510 .

In the illustrated example, Q2_DRV may be defined as a second gate signal Q2_DRV for controlling the second switch Q2 of the full-bridge inverter 510 .

In the illustrated example, Q3_DRV may be defined as a third gate signal Q3_DRV for controlling the third switch Q3 of the full-bridge inverter 510 .

In the illustrated example, Q4_DRV may be defined as a fourth gate signal Q4_DRV for controlling the fourth switch Q4 of the full-bridge inverter 510 .

In the illustrated example, the high state H of each of the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV is the first to fourth switches Q1, Q2, Q3, Q4 implemented as MOSFETs. ) can be defined as a voltage state that can turn on.

In the illustrated example, the low state H of each of the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV is the first to fourth switches Q1, Q2, Q3, Q4 implemented as MOSFETs. ) can be defined as a voltage state that can turn off.

In various embodiments of the present document, the expression “the gate signal is output” may be defined as a high state (H) of the gate signal. For example, the expression “the first gate signal Q1_DRV is output” may mean that the first gate signal Q1_DRV is in the high state (H).

In various embodiments of the present document, the expression “the gate signal is not output” may be defined as the gate signal being in a low state (L). For example, the expression “the first gate signal Q1_DRV is not output” may mean that the first gate signal Q1_DRV is in the low state H.

Although not shown, immediately before the rising edge of each of the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV (eg, the time when the signal transitions from the low state (L) to the high state (H)) A dead time with a specified length (eg, a duty cycle of about 1% to 3%) can be established. For example, each of the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV has a low state (L) period of a specified length (eg, a duty cycle of about 1% to 3%) during the dead time. may include According to an embodiment, the dead time may be a period for zero voltage switching (ZVS) when the first to fourth switches Q1 , Q2 , Q3 , and Q4 are turned on. The power transmitter 302 according to an embodiment may reduce power loss due to switching noise by enabling zero voltage switching when the first to fourth switches Q1, Q2, Q3, and Q4 are turned on. .

5 and 6, the Tx control circuit 530 of the power transmission device 302, the first switch (Q1) and the third switch (Q3) and the second switch constituting the full-bridge inverter 510 The power signal supplied from the power circuit 520 may be supplied to the transmission coil 311L by alternately turning on Q2 and the fourth switch Q4 .

According to an embodiment, the operation of the Tx control circuit 530 controlling the full-bridge inverter 510 may be divided into a first operation 601 and a second operation 601 , and the Tx control circuit 530 . may alternately perform the first operation 601 and the second operation 602 based on the specified frequency. For example, the Tx control circuit 530 performs the second operation 602 after performing the first operation 601 , and performs the first operation 601 after performing the second operation 602 . can be done

As a first operation 601 , the Tx control circuit 530 outputs the second gate signal Q2_DRV and the fourth gate signal Q4_DRV, and the first gate signal Q1_DRV and the third gate signal Q3_DRV. may not be output. For example, while the Tx control circuit 530 performs the first operation 601 , the second switch Q2 and the fourth switch Q4 are turned on, and the first switch Q1 and the third switch Q3 are turned on. ) can be turned off. The power transmission device 302, the power signal supplied from the power supply circuit 520 through the second switch (Q2) and the fourth switch (Q4) while the Tx control circuit 530 performs the first operation (601) may be supplied to the transmitting coil 311L.

As a second operation 602 , the Tx control circuit 530 outputs a first gate signal Q1_DRV and a third gate signal Q3_DRV, and a second gate signal Q2_DRV and a fourth gate signal Q4_DRV. may not be output. For example, during the second operation 602 of the Tx control circuit 530 , the first switch Q1 and the third switch Q3 are turned on, and the second switch Q2 and the fourth switch Q4 are turned on. ) can be turned off. The power transmission device 302, the power signal supplied from the power supply circuit 520 through the first switch (Q1) and the third switch (Q3) while the Tx control circuit 530 performs the second operation (602) may be supplied to the transmitting coil 311L.

According to an embodiment, the Tx control circuit 530 controls the transmitting coil 311L by adjusting the frequency f at which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. Transmission power (eg, power of a power signal) transmitted to the power receiving device 301 through the For example, the Tx control circuit 530 may increase the transmit power by lowering the frequency f at which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. The Tx control circuit 530 may lower the transmit power by increasing the frequency f at which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. In various embodiments of the present document, the Tx control circuit 530 of the power transmission device 302 controls the frequency f at which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. A state of adjusting the transmission power by adjusting may be defined as a “pulse frequency modulation mode (PFM mode)” of the power transmission device 302 .

According to an embodiment, the Tx control circuit 530 adjusts the duty cycles D1 and D2 of the gate signals while the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. As a result, it is possible to adjust the transmission power (eg, the power of the power signal) transmitted to the power receiving device 301 through the transmission coil 311L. For example, the Tx control circuit 530 may increase the transmit power by increasing the duty cycles D1 and D2 through which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. The duty cycle is a first gate signal to a first gate signal for controlling the first to fourth switches Q1, Q2, Q3, and Q4 in one cycle of repeating the first operation 610 and the second operation 620 . The time when the 4 gate signals (Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV) are output (eg, the signal is in a high state (H)) and the first to fourth gate signals (Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV) are not output It may mean a ratio of a time when the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output to the sum of time (eg, when the signal is in a low state (L)). The Tx control circuit 530 may lower the transmit power by lowering the duty cycle through which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. For example, the transmit power when the gate signal is output with a duty cycle D1 of 50% may be higher than the transmit power when the gate signal is output with a duty cycle D2 of 30%. In various embodiments of the present document, the Tx control circuit 530 of the power transmission device 302 outputs a duty cycle D1 to which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. A state of adjusting the transmission power by adjusting D2) may be defined as a “pulse width modulation mode (PWM mode)” of the power transmission device 302 .

According to an embodiment, the Tx control circuit 530 operates in a PFM mode or a PWM mode based on a feedback control signal (eg, a rising control signal and/or a falling control signal) received from the power receiving device 301 . can operate as For example, the Tx control circuit 530 controls the load current (eg, the current supplied to the charger 570 of FIG. 5 ) of the power receiving device 301 through the feedback control signal received from the power receiving device 301 . can be checked, and may operate in PFM mode or PWM mode in order to set the transmit power corresponding to the load current.

According to an embodiment, the Tx control circuit 530 receives a down control signal requesting to lower the power of the power signal to less than a specified power from the power receiving device 301, and PWM in response to the down control signal. mode can be operated.

According to an embodiment, the Tx control circuit 530 receives a rising control signal requesting to increase the power of the power signal to be greater than or equal to a specified power from the power receiving device 301, and responds to the rising control signal. to switch from PWM mode to PFM mode.

According to an embodiment, the Tx control circuit 530 operates in the PFM mode within a specified frequency range to control power, and when the frequency change for controlling power is out of the specified frequency range, switches to the PWM mode to control power can do.

7 is a graph showing the magnitude of transmission power (eg, power of a power signal) according to the PFM mode and the PWM mode. A graph 701 of FIG. 7 represents an output frequency of a gate signal output from the Tx control circuit 530 . A graph 702 of FIG. 7 represents a duty cycle of a gate signal output from the Tx control circuit 530 .

Referring to FIG. 7 , the Tx control circuit (eg, the Tx control circuit 530 of FIG. 5 ) receives a feedback control signal (eg, rise control) from the power receiving device (eg, the power receiving device 301 of FIG. 5 ). signal and/or a falling control signal), the load current of the power receiving device 301 may be checked, and may operate in PFM mode or PWM mode in order to set transmission power corresponding to the load current.

The Tx control circuit 530 may increase the transmit power by lowering the frequencies at which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output (eg, the frequency f of FIG. 6 ). . The Tx control circuit 530 may lower the transmit power by increasing the frequency f at which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output.

The Tx control circuit 530 may set a limiting frequency f1 in increasing the frequency f at which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. The limiting frequency f1 may be, for example, a threshold value defined in a wireless charging standard (eg, wireless power consortium (WPC)) in consideration of electro magnetic interference (EMI). For example, the maximum value of the frequency f at which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output may be set to about 150 kHz.

According to the illustrated example, the limiting frequency f1 is set to 148 kHz, and the Tx control circuit 530 outputs a frequency f at which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. cannot be increased above 148 kHz.

The Tx control circuit 530 receives a falling control signal from the power receiving device 301 to request to lower the transmission power below the specified voltage P1 corresponding to the limit frequency f1, from the PFM mode to the PWM mode. can be switched

The Tx control circuit 530 switched to the PWM mode maintains a frequency f at which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output as a limiting frequency f1, and the first The duty cycle through which the gate signal to the fourth gate signal Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output may be adjusted.

According to an exemplary embodiment, the Tx control circuit 530 may adjust the duty cycle of the gate signal while the first gate signal to the fourth gate signal Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are outputted to the transmit coil 311L. ) to adjust the transmission power (eg, the power of the power signal) transmitted to the power receiving device 301 . For example, the Tx control circuit 530 may increase the transmission power by increasing the duty cycle through which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. The Tx control circuit 530 may lower the transmit power by lowering the duty cycle through which the first to fourth gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV are output. For example, the transmit power when the gate signal is output with a duty cycle of 50% may be higher than the transmit power when the gate signal is output with a duty cycle of 30%.

The Tx control circuit 530 may set a threshold value in lowering the duty cycle of the gate signal. For example, the threshold value of the duty cycle is set to about 30%, and the Tx control circuit 530 cannot lower the duty cycle of the gate signal to less than the threshold value of about 30%. The threshold value of the duty cycle may be a threshold value set to achieve zero voltage switching (ZVS) when the first to fourth switches Q1 , Q2 , Q3 , and Q4 are turned on. For example, when the duty cycle of the gate signal is lowered to less than a threshold value (eg, less than about 30%), zero voltage switching is not performed when the first to fourth switches Q1, Q2, Q3, and Q4 are turned on. , power loss due to switching noise may increase.

In driving the gate signal in the PWM mode, the power transmitter 302 according to various embodiments of the present invention receives a request to further lower the power of the power signal while the duty cycle is lowered by a threshold to the power receiver 301 . When receiving from , the full-bridge inverter can be driven by switching from the full-bridge mode to the half-bridge mode. When the power transmission device 302 switches the full-bridge inverter from the full-bridge mode to the half-bridge mode and drives it, the transmission power (eg, driving power or driving voltage) applied to the transmission coil is reduced by about 50%, so that the power of the power signal is can be lower

The power receiving device 301 according to various embodiments of the present invention operates the rectifying circuit 540 in conjunction with the driving of the power transmitting device 302 by switching the full-bridge inverter from the full-bridge mode to the half-bridge mode. (voltage doubler), it is possible to prevent the initialization of the wireless charging operation due to undershoot (undershoot) of the output voltage (eg, the output voltage (Vout) of FIG. 5 ).

As described above, the switching from the full-bridge mode to the half-bridge mode of the power transmitter 302 and driving the voltage multiplier circuit of the power receiver 301 will be described in detail later with reference to FIG. 8 .

8 is an operation flowchart of a wireless charging system (eg, the wireless charging system 300 of FIG. 3 ) according to various embodiments of the present disclosure.

At least some of the operations illustrated in FIG. 8 may be omitted. At least some operations mentioned with reference to other drawings in various embodiments of this document before or after at least some operations illustrated in FIG. 8 may be additionally inserted.

The operations illustrated in FIG. 8 are performed by a control circuit (eg, the control circuit 312 of FIG. 3 ) of the power transmission device 302 (eg, the power transmission device 302 of FIG. 3 ), or the power reception device It may be performed by a processor (eg, the processor 322 of FIG. 3 ) of 301 (eg, the power receiving device 301 of FIG. 3 ). For example, the memory of the power transmission device 302 (eg, the memory 130 of FIG. 1 ) may, when executed, include instructions that cause the control circuit 312 to perform at least some operations shown in FIG. instructions) can be stored. For example, the memory (eg, the memory 130 of FIG. 1 ) of the power receiving device 301 may store instructions that, when executed, cause the processor 322 to perform at least some operations illustrated in FIG. 8 . there is.

According to an embodiment, the operations illustrated in FIG. 8 may be an example of exemplifying operations 450 and subsequent operations 450 illustrated in FIG. 4 .

In various embodiments of the present document, the full bridge mode (hereinafter, referred to as FB mode) of the power transmission device 302 is, as described in the power transmission device 302 with reference to FIG. 6 , the first switch Q1 ) and the operation of turning on the third switch Q3 and the operation of turning on the second switch Q2 and the fourth switch Q4 are alternately repeated. Control operations of the first to fourth switches Q1, Q2, Q3, and Q4 according to the FB mode of the power transmitter 302 may be defined as shown in Table 1. For example, alternately performing turn-on and turn-off may mean performing operations 601 and 602 of FIG. 6 .

switch state The first switch (Q1), the third switch (Q3) Turn-on and turn-off are performed alternately The second switch (Q2), the fourth switch (Q4) Operates opposite to the first switch (Q1) and the third switch (Q3)

In various embodiments of the present document, the half-bridge mode (hereinafter, referred to as HB mode) of the power transmission device 302 is any one of the operations of the power transmission device 302 as disclosed in Tables 2 to 5 It can be defined as a state that performs an operation different from

switch state first switch (Q1) always turn-on second switch (Q2) always turn-off 3rd switch (Q3) Turn-on and turn-off are performed alternately 4th switch (Q4) Operates opposite to that of the third switch (Q3)

switch state first switch (Q1) always turn-off second switch (Q2) always turn-on 3rd switch (Q3) Turn-on and turn-off are performed alternately 4th switch (Q4) Operates opposite to that of the third switch (Q3)

switch state first switch (Q1) Turn-on and turn-off are performed alternately second switch (Q2) Operates opposite to the first switch (Q1) 3rd switch (Q3) always turn-on 4th switch (Q4) always turn-off

switch state first switch (Q1) Turn-on and turn-off are performed alternately second switch (Q2) Operates opposite to the first switch (Q1) 3rd switch (Q3) always turn-off 4th switch (Q4) always turn-on

When the power transmission device 302 according to various embodiments operates in the HB mode, as disclosed in Tables 2 to 5, one end (eg, n1 of FIG. 5 ) of the transmission coil (eg, the transmission coil of FIG. 5 ) ) connected to only two switches (eg, the first switch Q1 and the second switch Q2 of FIG. 5 ), or two switches connected to the other end of the transmitting coil (eg, n2 in FIG. 5 ) Only the switches (eg, the third switch Q3 and the fourth switch Q4 of FIG. 5 ) may be switched and driven.

In operation 801 , the power transmitter 302 may transmit a power signal to the power receiver 301 in the FB mode and the PFM mode. For example, the power transmitter 302 controls the first to fourth switches Q1, Q2, Q3, and Q4, as defined in Table 1, but the first to fourth switches Q1 and Q2 The frequencies of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV controlling the , Q3 and Q4 may be adjusted.

According to an embodiment, the power transmitter 302 responds to a feedback control signal (eg, a rise control signal and/or a fall control signal) received from the power receiver 301 while operating in the FB mode and the PFM mode. The power of the power signal may be increased by lowering the frequencies of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV, or the power of the power signal may be lowered by increasing the frequencies of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV.

In operation 802 , the power receiving device 301 may detect a load current (eg, a current supplied to the adjustment circuit 560 of FIG. 5 ) while the battery is CV charged. The power receiving device 301 may transmit a down control signal requesting to further lower the power of the power signal to the power transmitting device 302 when the load current is less than the specified first current. For example, the falling control signal is a signal requesting to change the power of the power signal to a value lower than a specified first power corresponding to a threshold frequency (eg, about 150 kHz) of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV may include

In operation 811 , the power transmitting device 302 transmits a power signal to the power receiving device 301 in the FB mode and PFM mode in response to the down control signal received from the power receiving device 301 from the state of transmitting the FB mode and PWM mode, a state in which the power signal is transmitted to the power receiving device 301 may be switched. For example, the power transmitter 302 controls the first to fourth switches Q1, Q2, Q3, and Q4, as defined in Table 1, but the first to fourth switches Q1 and Q2 , Q3, and Q4 may be adjusted with duty cycles of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV.

According to an embodiment, the power transmitter 302 responds to a feedback control signal (eg, a rise control signal and/or a fall control signal) received from the power receiver 301 while operating in the FB mode and the PWM mode. The power of the power signal can be increased by increasing the duty cycle of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV, or the power of the power signal can be lowered by lowering the duty cycle of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV. there is.

In operation 803 , the power transmitter 302 may supply a power signal to the power receiver 301 based on the FB mode and the PWM mode.

In operation 804 , the power receiving device 301 may transmit a down control signal requesting to further lower the power of the power signal to the power transmitting device 302 when the load current is less than the specified second current. For example, the falling control signal may include a signal requesting to change the power of the power signal to a value lower than a specified second power corresponding to a threshold duty cycle (eg, about 30%) of the gate signal.

In operation 812 , the power transmitter 302 transmits the power signal to the power receiver 301 in the FB mode and the PWM mode in response to the down control signal received from the power receiver 301 to convert the power to the HB mode. A state in which a signal is transmitted to the power receiving device 301 may be switched. For example, as defined in Tables 2 to 5, the power transmitter 302 controls only some of the first to fourth switches Q1, Q2, Q3, and Q4 to drive power of the transmitting coil can be reduced by about 50%.

The power transmitter 302 is configured to operate in the HB mode, in response to a feedback control signal (eg, a rise control signal and/or a fall control signal) received from the power receiver 301 while operating in the HB mode, the first to fourth switches ( The frequencies or duty cycles of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV that control only some of Q1, Q2, Q3, and Q4 may be adjusted.

According to an embodiment, the power transmitter 302 increases the power of the power signal by lowering the frequencies of the some of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV while operating in the HB mode, or the part of the gate signal The power of the power signal may be lowered by increasing the frequencies of the Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV. For example, the power transmitter 302 may operate in an HB mode and a PFM mode.

According to an embodiment, the power transmitter 302 increases the power of the power signal by increasing the duty cycle of some of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV while operating in the HB mode, or The power of the power signal may be lowered by lowering the duty cycle of the signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV. For example, the power transmitter 302 may operate in an HB mode and a PWM mode.

In operation 805 , the power transmitter 302 may supply a power signal to the power receiver 301 based on the HB mode. For example, the power transmitter 302 may operate in HB mode and PFM mode, or may operate in HB mode and PWM mode. In some embodiments, the power transmitter 302 may switch to the HB mode and the PWM mode while operating in the HB mode and the PFM mode. In some embodiments, when the power transmitter 302 operates in the HB mode, operating in the HB mode and the PWM mode may be omitted. According to an embodiment, the power transmitter 302 may transmit data regarding the switching of the power transmitter 302 to the HB mode to the power receiver 301 . For example, the power receiving device 301 may determine that the power transmitting device 302 is switched to the HB mode by receiving the data. According to an embodiment, the power transmitter 302 may inform the power transmitter 302 that the HB mode has been switched to the frequency shift keying (FSK) or amplitude shift keying (ASK) modulation technique. According to another embodiment, the power transmission device 302 uses any one of a variety of short-range communication methods such as Bluetooth (Bluetooth), BLE, Wi-Fi, and/or NFC to the power transmission device 302 to HB It can notify that the mode has been switched.

In operation 821 , the power receiver 301 may drive the rectifier circuit 540 as a voltage multiplying circuit in response to the power transmitter 302 being switched to the HB mode.

In various embodiments of the present document, the “state in which the power receiving device 301 drives the voltage multiplier circuit” refers to the fifth to eighth switches in which the power receiving device 301 is included in the rectifying circuit 540 . (For example, it may be defined as a state in which any one of the fifth to eighth switches S1, S2, S3, and S4 of FIG. 5 is always turned on. For example, the power receiving device The Rx control circuit 550 at 301 may drive the rectifier circuit 540 as a voltage multiplier circuit by always turning on the sixth switch S2 as shown in FIG. 5 .

The power receiver 301 may increase the output voltage of the rectifier circuit 540 (the output voltage Vout of FIG. 5 ) by about two times by driving the rectifier circuit 540 as a voltage multiplying circuit. The power receiver 301 operates the rectifier circuit 540 as a voltage multiplier circuit in conjunction with the power transmitter 302 switching the full-bridge inverter from the full-bridge mode to the half-bridge mode to drive the output voltage Vout. It is possible to prevent the initialization of the wireless charging operation due to undershoot.

In operation 806, the power receiving device 301 transmits a rising control signal requesting to increase the power of the power signal as a pre-operation for releasing the driving of the voltage multiplier circuit when the load current is less than the specified third current. 302) can be transmitted. For example, when the load current is less than the third specified current, the power receiving device 301 may increase the target voltage by a specified magnification (eg, about 50%) before releasing the driving of the voltage multiplier circuit.

In operation 807 , the power transmitter 302 may increase the power of the power signal in response to the rising control signal. For example, the power transmission device 302 controls only some of the first to fourth switches Q1, Q2, Q3, and Q4 in the HB mode and the PFM mode of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV ) by lowering the frequency, the power receiving device 301 may transmit a power signal with power corresponding to the target voltage increased by a specified magnification.

In operation 822 , when the output voltage of the rectifier circuit 540 reaches a target voltage increased by a specified magnification, the power receiver 301 may stop (or release) the driving of the voltage multiplier circuit.

In the wireless charging system according to various embodiments, the power receiving device 301 drives the voltage multiplier circuit in association with the power transmission device 302 switching from the FB mode to the HB mode, thereby lowering the output voltage Vout. It is possible to prevent the initialization of the wireless charging operation due to an undershoot, and to stably switch to the HB mode.

In the wireless charging system according to various embodiments, the falling control signal (eg, a signal requesting to lower the power of the power signal to less than the specified power) and the rising control signal transmitted by the power receiving device 301 to the power transmitting device 302 A control signal (eg, a signal requesting to increase the power of the power signal to a power greater than or equal to a specified power) may be transmitted through an in-band method or an out-band method. For example, in the case of using the in-band method, the first communication circuit 323a of the power receiving device 301 transmits power to the power transmitting device 301 using a frequency that is the same as or adjacent to a frequency used for power transmission. It may communicate with the first communication circuit 313a. For another example, when using the out-band method, the second communication circuit 323b of the power receiving device 301 is Bluetooth (Bluetooth), BLE, Wi-Fi, and / or various short-range communication methods such as NFC A power adjustment request signal may be transmitted to the second communication circuit 313b of the power transmission device 302 through .

In the wireless charging system according to various embodiments, the falling control signal and the rising control signal transmitted by the power receiving device 301 to the power transmitting device 302 are between the power receiving device 301 and the power transmitting device 302 . It can be based on the commands negotiated in For example, the power receiver 301 may transmit a down control signal and a rise control signal to the power transmitter 302 , and receive a response signal corresponding thereto from the power transmitter 302 .

In the wireless charging system according to various embodiments, the power transmission device 302 is the power transmission device 302 in an operation (eg, operation 440 in FIG. 4 ) of exchanging setting information related to wireless charging with the power receiving device 301 . ) can exchange information on mode changes (eg, PFM mode, PWM mode, FB mode and/or BF mode). For example, the power transmitter 302 receives a battery state (eg, battery level) and/or a load current state of the power receiver 301, and based on the received information, the mode of the power transmitter 302 is can be changed

9 is an example of an operation scenario of a wireless charging system according to various embodiments of the present disclosure.

The graph 901 of FIG. 9 shows gate signals Q1_DRV and Q2_DRV for driving a full bridge inverter (eg, the full bridge inverter of FIG. 5 ) of the power transmission device 302 (eg, the power transmission device 302 of FIG. 5 ). , Q3_DRV, Q4_DRV). A graph 902 of FIG. 9 represents frequencies of gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV driving the full-bridge inverter of the power transmission device 302 . A graph 903 of FIG. 9 represents a load current (eg, a current supplied to the adjustment circuit 560 of FIG. 5 ) of the power receiver 301 . A graph 904 of FIG. 9 shows a rectified voltage Vrec of the power receiving device 301 (eg, an output voltage Vout of the rectifying circuit 540 of FIG. 5 ).

A graph 911 of FIG. 9 represents a voltage multiplier circuit control signal V_DBL. For example, the voltage multiplier circuit control signal V_DBL may be activated in response to the power transmission device 302 switching to the HB mode. When the voltage multiplier circuit control signal V_DBL of the Rx control circuit 550 is activated, any one of the fifth to eighth switches included in the rectifying circuit 540 may be continuously turned on.

Referring to FIG. 9 , the power transmitter 302 may switch the first to fourth gate signals as shown in Table 1 while operating in the FB mode.

In the illustrated example, the power receiving device 301 may CV charge the battery (eg, the battery of FIG. 3 ), and the load current (eg, refer to graph 903 ) may gradually decrease. The power transmitter 302 may perform feedback control such that the power of the power signal gradually decreases based on the down control signal received from the power receiver 301 (eg, the power receiver 301 of FIG. 5 ). . For example, while the power transmitter 302 operates in the FB mode, the frequencies of the first to fourth gate signals may be maintained at the maximum threshold value, and the duty cycle may be gradually lowered.

As shown in part 941 of graph 903, when the load current is less than or equal to the specified second current, the power receiving device 301 transmits a down control signal requesting to further lower the power of the power signal to the power transmitting device 302 can For example, the falling control signal may include a signal requesting to change the power of the power signal to a value lower than a specified second power corresponding to a threshold duty cycle (eg, about 30%) of the gate signal. According to an embodiment, the down control signal may include a signal requesting the power transmitter 302 to switch to the HB mode. According to various embodiments, the power transmitter 302 operates in response to a threshold duty cycle (eg, about 30%) of the power of the power signal (eg, the duty cycle of each of the first gate signal to the fourth gate signal) When data related to a request to further lower the power of the power signal is received from the power receiving device 301 in a state driven by this critical duty cycle), the power signal may be transmitted by changing the HB mode.

The power transmitter 302 receives the power signal in the HB mode from a state in which the power signal is transmitted to the power receiver 301 in the FB mode and the PWM mode in response to the down control signal received from the power receiver 301 . A state of transmitting to the device 301 may be switched. For example, as defined in Tables 2 to 5, the power transmitter 302 controls only some of the first to fourth switches Q1, Q2, Q3, and Q4 to transmit power of the transmitting coil can be reduced by about 50%. In the illustrated example, when the power transmitter 302 operates in the HB mode, as shown in Table 4, the first switch Q1 alternately performs turn-on and turn-off, and the second switch Q2 is Opposite to the first switch Q1, the third switch Q3 is always turned on, and the fourth switch Q4 is always turned off.

The power receiver 301 may drive the rectifier circuit 540 as a voltage multiplier circuit in response to the power transmitter 302 being switched to the HB mode. For example, as shown in FIG. 5 , the Rx control circuit 550 of the power receiving device 301 always turns on the sixth switch (eg, the sixth switch S2 in FIG. 5 ) to turn on the rectifier circuit ( 540) may be driven by a voltage multiplier circuit. The power receiver 301 may increase the output voltage Vrec of the rectifier circuit 540 by about two times by driving the rectifier circuit 540 as a voltage multiplier circuit.

The power receiving device 301 according to various embodiments of the present invention operates the rectifying circuit 540 in conjunction with the driving of the power transmitting device 302 by switching the full-bridge inverter from the full-bridge mode to the half-bridge mode. It is possible to prevent the initialization of the wireless charging operation due to undershoot of the output voltage (eg, the output voltage Vout of FIG. 5 ) by making it operate as . For example, looking at graph 952 according to the comparative example, it can be seen that the output voltage is lowered to about 2.5V after the power transmitter 302 is switched from the FB mode to the HB mode. As such, when an undershoot of the output voltage abruptly occurs, the power receiving device 301 may stop and initialize the wireless charging operation. On the other hand, looking at graph 951 according to various embodiments of the present invention, even after the power transmitter 302 is switched from the FB mode to the HB mode, the power receiver 301 converts the rectifier circuit 540 into a voltage multiplier circuit. It can be seen that the undershoot of the output voltage does not occur by driving.

A graph 932 of FIG. 9 shows a wireless charging system according to a comparative example, and the power transmitter 302 uses gate signals Q1_DRV, Q2_DRV, It can be seen that the frequencies of Q3_DRV and Q4_DRV) are sharply lowered. In the wireless charging system according to this comparative example, even if the power transmission device 302 sharply lowers the frequency of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV to increase the power of the power signal, the power receiving device 301 is wirelessly charged It may be in a state in which the operation has been stopped and initialized.

A graph 922 of FIG. 9 shows a wireless charging system according to a comparative example, and the power transmitter 302 uses gate signals Q1_DRV, Q2_DRV, It can be seen that the duty cycle of Q3_DRV and Q4_DRV) is rapidly increased. In the wireless charging system according to this comparative example, even if the power transmitter 302 sharply increases the duty cycle of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV to increase the power of the power signal, the power receiver 301 wirelessly It may be in a state in which the charging operation is stopped and initialized. On the other hand, looking at the graph 921 according to various embodiments of the present invention, the power transmitter 302 increases the duty cycle of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV. From the FB mode to the HB mode It can be seen that the output voltage of the power receiving device 301 is stably feedback-controlled after being switched to .

10 is another example of an operation scenario of a wireless charging system according to various embodiments of the present disclosure.

The graph 1001 of FIG. 10 shows gate signals Q1_DRV and Q2_DRV for driving a full bridge inverter (eg, the full bridge inverter of FIG. 5 ) of the power transmission device 302 (eg, the power transmission device 302 of FIG. 5 ). , Q3_DRV, Q4_DRV). A graph 1002 of FIG. 10 shows frequencies of gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV driving the full-bridge inverter of the power transmission device 302 . A graph 1003 of FIG. 10 shows a load current (eg, a current supplied to the adjustment circuit 560 of FIG. 5 ) of the power receiving device 301 (eg, the power receiving device 301 of FIG. 5 ). A graph 1004 of FIG. 10 shows the output voltage of the adjustment circuit 560 of the power receiving device 301 . The graph 1005 of FIG. 10 shows the output voltages 1019 and 1021 (eg, the output voltage Vout of FIG. 5 ) and the target voltage 1018 of the rectifier circuit 540 of the power receiver 301 . In FIG. 10 , the voltage multiplier circuit control signal V_DBL may be activated in response to the power transmission device 302 switching to the HB mode. When the voltage multiplier circuit control signal V_DBL of the Rx control circuit 550 is activated, any one of the fifth to eighth switches included in the rectifying circuit 540 may be continuously turned on.

Referring to FIG. 10 , the power transmitter 302 may switch the first to fourth gate signals as shown in Table 1 while operating in the FB mode.

In the illustrated example, the power receiving device 301 may CV charge the battery, and the load current may gradually decrease. The power transmitter 302 may perform feedback control such that the power of the power signal is gradually lowered based on the down control signal received from the power receiver 301 . For example, while the power transmitter 302 operates in the FB mode, as shown in part 1013 of the graph 1001 , the frequencies of the first gate signal to the fourth gate signal are maintained at the maximum threshold value, and the duty cycle is gradually increased. can be lowered

As shown in part 1011 of graph 1003 (eg, about 0.4A), when the load current is less than or equal to the second specified current, the power receiving device 301 sends a down control signal requesting to further lower the power of the power signal. It may transmit to the power transmitter 302 . For example, the falling control signal may include a signal requesting to change the power of the power signal to a value lower than a specified second power corresponding to a threshold duty cycle (eg, about 30%) of the gate signal. According to an embodiment, the down control signal may include a signal requesting the power transmitter 302 to switch to the HB mode.

The power transmitter 302 transmits the power signal to the HB mode from a state in which the power signal is transmitted to the power receiver 301 in the FB mode and the PWM mode in response to the down control signal received from the power receiver 301 . A state of transmitting to the receiving device 301 may be switched. For example, as defined in Tables 2 to 5, the power transmitter 302 controls only some of the first to fourth switches Q1, Q2, Q3, and Q4 to transmit power of the transmitting coil can be reduced by about 50%. In the illustrated example, when the power transmitter 302 operates in the HB mode, as shown in Table 4, the first switch Q1 alternately performs turn-on and turn-off, and the second switch Q2 is Opposite to the first switch Q1, the third switch Q3 is always turned on, and the fourth switch Q4 is always turned off.

Referring to part 1012 of the graph 1020 , the power receiver 301 may drive the rectifier circuit 540 as a voltage multiplier circuit in response to the power transmitter 302 being switched to the HB mode. For example, the Rx control circuit 550 of the power receiving device 301 may drive the rectifier circuit 540 as a voltage multiplier circuit by always turning on the sixth switch S2 as shown in FIG. 5 . there is. The power receiver 301 may increase the output voltage Vrec of the rectifier circuit 540 by about two times by driving the rectifier circuit 540 as a voltage multiplier circuit.

While the power transmitter 302 operates in the HB mode, as shown in part 1014 of the graph 1001 , feedback control is performed so that the power of the power signal gradually decreases in response to the load current of the power receiver 301 gradually decreases. can do.

As shown in part 1017 of the graph 1003, when the load current is less than or equal to the third current (eg, about 0.1A), the power receiving device 301, as a pre-operation to release the driving of the voltage multiplier circuit, the power signal It is possible to transmit a rising control signal requesting to increase the power of the power transmitter 302 . For example, when the load current is less than the specified third current, the power receiving device 301 increases the target voltage by a specified magnification (eg, about 40 % to 60%). For example, the power receiving device 301 may increase the target voltage to a specified voltage (5V to 7.5V).

The power transmitter 302 may increase the power of the power signal in response to the rising control signal. For example, as shown in part 1016 of graph 1001 and part 1019 of graph 1002 , the power transmitter 302 is designated by the power receiver 301 as “HB mode and PWM mode” and/or “HB mode and PFM mode” The frequency and/or duty cycle of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV may be controlled to transmit the power signal with power corresponding to the target voltage increased by the magnification. Alternatively, the Vin voltage can be changed and controlled.

As shown in part 1021 of the graph 1005 , when the output voltage of the rectifier circuit 540 reaches the target voltage increased by the specified magnification, the power receiving device 301 restores the target voltage to the previous value and stops driving the voltage multiplier circuit. (or cancel).

11 is a flowchart of an operation of the power receiving apparatus 301 according to various embodiments of the present disclosure.

At least some of the operations illustrated in FIG. 11 may be omitted. At least some operations mentioned with reference to other drawings in various embodiments of this document before or after at least some operations illustrated in FIG. 11 may be additionally inserted.

The operations illustrated in FIG. 11 may be performed by a processor (eg, the processor 322 of FIG. 3 ) of the power receiving apparatus 301 (eg, the power receiving apparatus 301 of FIG. 5 ). For example, the memory (eg, the memory 130 of FIG. 1 ) of the power receiving device 301 may store instructions that, when executed, cause the processor 322 to perform at least some operations illustrated in FIG. 11 . there is.

In operation 1110 , the power receiving device 301 (eg, the electronic device 101 of FIG. 1 ) may wirelessly receive power through a coil (eg, the receiving coil of FIG. 5 ). For example, operation 1110 may be the same as or at least partially similar to operation 450 illustrated in FIG. 4 .

In operation 1120 , the power receiving device 301 , the power receiving device 301 CV charges the battery (eg, the battery of FIG. 3 ), while the load current (eg, the current supplied to the adjustment circuit 560 of FIG. 5 ) ) can be detected.

In operation 1130 , the power receiving device 301 may determine whether the load current is smaller than the first reference current. The power receiver 301 may repeatedly perform operations 1110 and 1120 when the load current is greater than the first reference current.

According to an embodiment, when the load current of the power receiving device 301 is smaller than the first reference current, in operation 1140 , the power receiving device 301 transmits the power to the power transmitting device 302 (eg, the power transmission of FIG. 5 ). device 302 ) to send a switch to HB mode command. According to an embodiment, the data instructing the power receiving device 301 to transmit to the power transmitting device 302 to switch to the HB mode may include a down control signal requesting to further lower the power of the power signal. there is. For example, according to an embodiment, when the load current is less than the first reference current, in operation 1140 , the power receiving device 301 may transmit a down control signal to the power transmitting device 302 . The power transmitter 302 may switch to the HB mode based on the down control signal received from the power receiver 301 .

The power receiving device 301 may transmit a down control signal (eg, a first command signal) requesting to lower the power of the power signal to the power transmitting device 302 when the load current is less than the specified first reference current. For example, the falling control signal is a signal requesting to change the power of the power signal to a value lower than a specified second power (eg, first threshold power) corresponding to a threshold duty cycle (eg, about 30%) of the gate signal. may include

The power transmitter 302 receives the power signal in the HB mode from a state in which the power signal is transmitted to the power receiver 301 in the FB mode and the PWM mode in response to the down control signal received from the power receiver 301 . A state of transmitting to the device 301 may be switched. For example, as defined in Tables 2 to 5, the power transmitter 302 controls only some of the first to fourth switches Q1, Q2, Q3, and Q4 to transmit power of the transmitting coil can be reduced by about 50%.

In operation 1150 , the power receiver 301 may determine that the power transmitter 302 is switched to the HB mode by detecting a drop in the rectified voltage.

The power receiver 301 may control the rectifier circuit 540 as a voltage multiplier circuit in response to detecting a drop in the rectified voltage. For example, as shown in FIG. 5 , the Rx control circuit 550 of the power receiver 301 may always turn on the sixth switch to drive the rectifier circuit 540 as a voltage multiplier circuit. The rectifier circuit 540 may operate as a voltage doubler to increase the rectified voltage by a specified magnification.

The power receiver 301 may transmit data indicating that the rectifier circuit 540 is being driven as a voltage multiplier circuit to the power transmitter 302 .

In operation 1160 , the power receiving device 301 may determine whether the load current is smaller than the second reference current while driving the voltage multiplier circuit. The second reference current may be smaller than the first reference current. The power receiving device 301 may perform operation 1170 when the load current is less than the second reference current (eg, the result of operation 1160 is “Yes”). The power receiver 301 may perform operation 1150 when the load current is less than the first reference current and greater than or equal to the second reference current (eg, the result of operation 1160 is “No”).

In operation 1170 , the power receiving device 301 may increase the target voltage by a specified magnification. For example, when the load current is smaller than the specified third current, the power receiving device 301 may generate a rising control signal (eg, the second command signal) to the power transmission device 302 . For example, when the load current is less than the third specified current, the power receiving device 301 may increase the target voltage by a specified magnification (eg, about 40% to 60%) before releasing the driving of the voltage multiplier circuit. there is. For example, the power receiving apparatus 301 may set the target voltage to a second target voltage that is higher than the currently set first target voltage by a specified magnification.

The power transmitter 302 may increase the power of the power signal in response to the rising control signal. For example, the power transmission device 302 controls only some of the first to fourth switches Q1, Q2, Q3, and Q4 in the HB mode and the PFM mode of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV ), the power receiving device 301 may transmit the power signal with power corresponding to the target voltage (eg, the second target voltage) increased by a specified magnification.

In operation 1180 , the power receiving device 301 may determine whether the rectified voltage reaches a second target voltage corresponding to a specified magnification.

When the rectified voltage increases to the second target voltage (eg, the result of operation 1180 is “Yes”), the power receiving device 301 may perform operation 1190 .

When the rectified voltage does not reach the second target voltage (eg, the result of operation 1180 is “No”), the power receiving device 301 may perform operation 1180 again.

When the output voltage Vout of the rectifier circuit 540 reaches the second target voltage, the power receiver 301 may stop (or release) the driving of the voltage multiplier circuit.

After stopping (or releasing) the driving of the voltage multiplier circuit, the power receiving device 301 sets the target voltage to the third target voltage, and a falling control signal (eg, a third command signal) including the third target voltage. ) may be transmitted to the power transmission device 302 . According to an embodiment, the third target voltage may be the same as or similar to the first target voltage, which is a previous value. For example, after stopping (or releasing) the driving of the voltage multiplier circuit, the power receiving device 301 sets the target voltage to the first target voltage, which is the previous value, and a falling control signal ( Example: a third command signal) may be transmitted to the power transmitter 302 .

The power transmitter 302 may lower the power of the power signal to a value corresponding to the first target voltage in response to the drop control signal. For example, the power transmission device 302 controls only some of the first to fourth switches Q1, Q2, Q3, and Q4 in the HB mode and the PFM mode of the gate signals Q1_DRV, Q2_DRV, Q3_DRV, Q4_DRV ), it is possible to transmit a power signal with power corresponding to the first target voltage.

Although not shown, according to an embodiment, if the load current is greater than the first reference current while performing operations 1150 to 1160, operations 1110 to 1130 may be re-performed. For example, when the load current is greater than the specified first reference current, the power receiving device 301 may transmit a control signal requesting to increase the power of the power signal to the power transmitting device 302 . As another example, the power receiving device 301 may transmit an FB switching command to the power transmitting device 302 .

12 is an operation flowchart of the power receiving apparatus 301 according to various embodiments of the present disclosure.

At least some of the operations illustrated in FIG. 12 may be omitted. At least some operations mentioned with reference to other drawings in various embodiments of this document before or after at least some operations illustrated in FIG. 12 may be additionally inserted. For example, the flowchart of FIG. 12 may include an embodiment that is at least partially similar to or different from the flowchart illustrated in FIG. 11 .

The operations illustrated in FIG. 12 may be performed by a processor (eg, the processor 322 of FIG. 3 ) of the power receiving apparatus 301 (eg, the power receiving apparatus 301 of FIG. 5 ). For example, the memory (eg, the memory 130 of FIG. 1 ) of the power receiving device 301 may store instructions that, when executed, cause the processor 322 to perform at least some operations illustrated in FIG. 12 . there is.

In operation 1210 , the power receiving device 301 (eg, the electronic device 101 of FIG. 1 ) may sense a load current supplied to a charger (eg, the charger 570 of FIG. 5 ). For example, operation 1210 may be at least partially similar to or identical to operation 1120 of FIG. 11 .

In operation 1220, when the load current is lower than the specified first reference current, the power receiving device 301 transmits a first command signal requesting to lower the power of the power signal to less than the specified first power to an external device (eg, : It can be transmitted to the power transmitter 301 of FIG. 3 ). For example, operation 1220 may be at least partially similar to or identical to operation 1140 of FIG. 11 .

In operation 1230 , the power receiver 301 may drive the rectifier circuit as a voltage multiplier when detecting a drop in the rectified voltage output from the rectifier circuit. For example, operation 1230 may be at least partially similar to or identical to operation 1150 of FIG. 11 .

13 is an operation flowchart of the power transmission apparatus 301 according to various embodiments of the present disclosure.

At least some of the operations illustrated in FIG. 13 may be omitted. At least some operations mentioned with reference to other drawings in various embodiments of this document before or after at least some operations illustrated in FIG. 12 may be additionally inserted.

The operations shown in FIG. 13 are performed by a processor (eg, the control circuit 312 of FIG. 3 or FIG. 1 ) of the power transmission device 302 (eg, the power transmission device 302 of FIG. 5 or the electronic device 101 of FIG. 1 ). 1 of the processor 120). For example, the memory (eg, the memory 130 of FIG. 1 ) of the power transmitter 302 may store instructions that, when executed, cause the processor 120 to perform at least some operations illustrated in FIG. 12 . there is.

In operation 1310 , the power transmission device 302 (eg, the electronic device 101 of FIG. 1 ) transmits a power signal to an external device (eg, the electronic device 101 of FIG. 3 ) by controlling the full-bridge inverter to operate in the full-bridge mode. may be transmitted to the power receiving device 301 ). For example, operation 1310 may be similar to or identical to at least some operations of the power transmitter 302 described in operations 801 and 803 of FIG. 8 .

In operation 1320 , the power transmitter 302 may control the full-bridge inverter to operate in a half-bridge mode in response to receiving a first command signal from an external device. For example, operation 1320 may be similar to or identical to at least some operations of the power transmitter 302 described in operation 805 of FIG. 8 .

In operation 1330 , the power transmitter 302 may change the power of the power signal to a value corresponding to a specified magnification in response to receiving the second command signal while operating in the half-bridge mode. For example, operation 1330 may be similar to or identical to at least some operations of the power transmitter 302 described in operation 807 of FIG. 8 .

Claims (20)

An electronic device for wirelessly receiving power from an external device, the electronic device comprising:
battery;
receiving coil;
a first switch electrically connected to one end of the receiving coil;
a second switch electrically connected to the one end of the receiving coil and connected in series with the first switch;
a third switch electrically connected to the other end of the receiving coil; and
a rectifying circuit including a fourth switch electrically connected to the other end of the receiving coil and connected in series with the third switch;
a charger supplying the rectified voltage from the rectifying circuit to the system of the electronic device and the battery; and
including a processor;
The processor is
Sensing the load current supplied to the charger,
When the load current is lower than the specified first reference current, transmitting a first command signal requesting to lower the power of the power signal to less than the specified first power to the external device, and
When a drop in the rectified voltage is sensed, any one of the first to fourth switches is continuously activated to drive the rectifier circuit as a voltage multiplier circuit. The method of claim 1,
The processor, while driving the rectifier circuit with the voltage multiplier circuit,
Check whether the load current is lower than the specified second reference current,
When the load current is lower than the second reference current, setting the target voltage to a second target voltage that is higher than the currently set first target voltage by a specified magnification, and
Transmitting a second command signal to increase the power of the power signal to the external device,
and the second reference current is less than the first reference current. 3. The method of claim 2,
The processor is configured to set the specified magnification to 40% to 60%. 3. The method of claim 2,
The processor is
After transmitting the second command signal to the external device, check whether the rectified voltage reaches the second target voltage, and
When the rectified voltage becomes the second target voltage, the operation of continuously activating any one of the first to fourth switches is stopped. 5. The method of claim 4,
The processor is
setting the target voltage to the third target voltage after stopping the operation of driving the rectifier circuit as the voltage multiplier circuit; and
and transmitting a third command signal including the third target voltage to the external device. The method of claim 1,
the first to fourth switches are metal-oxide semiconductor field effect transistors (MOSFETs);
The processor rectifies the power signal using body diode characteristics of the first to fourth switches. The method of claim 1,
The processor is
and charging the battery in a constant voltage (CV) manner during a period in which the load current is lower than the first reference current. The method of claim 1,
The processor determines that the external device has switched to a half-bridge mode when the rectified voltage starts to drop after transmitting the first command signal. 9. The method of claim 8,
and the processor drives the rectifier circuit as a voltage multiplier circuit based on determining that the external device has switched to the half-bridge mode. A method of driving an electronic device that wirelessly receives power from an external device, the electronic device comprising:
battery;
receiving coil;
a rectifying circuit electrically connected to the receiving coil;
a processor communicating with the external device through the receiving coil, and controlling the rectifying circuit to rectify a power signal of the external device received through the receiving coil;
a voltage adjusting circuit for adjusting the rectified voltage rectified by the rectifying circuit to a specified voltage; and
a charger for supplying the specified voltage to the system of the electronic device and the battery;
The method is
Sensing the load current supplied to the charger;
When the load current is lower than the specified first reference current, transmitting a first command signal requesting to lower the power of the power signal to less than the specified first power to the external device, and
and continuously activating any one of the first to fourth switches when the drop of the rectified voltage is sensed to drive the rectifying circuit as a voltage multiplier circuit. 11. The method of claim 10,
checking whether the load current is lower than a designated second reference current while the rectifier circuit is driven by the voltage multiplier circuit;
when the load current is lower than the second reference current, setting the target voltage to a second target voltage that is higher than the currently set first target voltage by a specified magnification; and
and transmitting a second command signal for increasing the power of the power signal to the external device,
wherein the second reference current is less than the first reference current. 12. The method of claim 11,
The method further comprising the operation of setting the specified magnification to 40% to 60%. 12. The method of claim 11,
checking whether the rectified voltage reaches the second target voltage after transmitting the second command signal to the external device; and
When the rectified voltage becomes the second target voltage, the method further comprising stopping the operation of continuously activating any one of the first to fourth switches. 14. The method of claim 13,
setting the target voltage to the third target voltage after stopping the operation of driving the rectifier circuit as the voltage multiplier circuit; and
The method further comprising transmitting a third command signal including the third target voltage to the external device. 11. The method of claim 10,
the first to fourth switches are metal-oxide semiconductor field effect transistors (MOSFETs);
and rectifying the power signal using body diode characteristics of the first to fourth switches. 11. The method of claim 10,
and charging the battery in a constant voltage (CV) manner during a period in which the load current is lower than the first reference current. 11. The method of claim 10,
and determining that the external device has switched to a half-bridge mode when the rectified voltage starts to drop after transmitting the first command signal. 18. The method of claim 17,
based on determining that the external device has switched to the half-bridge mode, driving the rectifier circuit as a voltage multiplier circuit. An electronic device for wirelessly transmitting power, comprising:
everyone;
transmitting coil;
a full-bridge inverter electrically connected to the power source and the transmitting coil;
a control circuit for controlling the full-bridge inverter to transmit a power signal through the transmitting coil; and
including a processor;
The full bridge inverter,
a first switch electrically connected to one end of the transmission coil and turned on in response to a first gate signal of the transmission control circuit;
a second switch electrically connected to the one end of the transmission coil and turned on in response to a second gate signal of the transmission control circuit;
a third switch electrically connected to the other end of the transmission coil and turned on in response to a third gate signal of the transmission control circuit; and
and a fourth switch electrically connected to the other end of the transmission coil and turned on in response to a fourth gate signal of the transmission control circuit,
The processor is
activating the first switch and the third switch, deactivating the second switch and the fourth switch, deactivating the first switch and the third switch, and activating the second switch and the fourth switch Controls the full-bridge inverter to operate in a full-bridge mode that alternately performs operations,
In response to receiving a first command signal requesting to lower the power of the power signal to less than a first specified power from an external device receiving the power signal while operating in the full bridge mode, the first switch to the controlling the full-bridge inverter to operate in a half-bridge mode in which only two switches selected from among the fourth switches are alternately turned on, and
In response to receiving a second command signal requesting to increase the power of the power signal by a specified multiplier from the external device while operating in the half-bridge mode, increase the power of the power signal to a value corresponding to the specified multiplier. changing, electronic devices. 20. The method of claim 19,
The processor is
Receive the first command signal while operating in the full bridge mode and controlling a duty cycle of each of the first to fourth gate signals to have a threshold duty cycle; and
In response to the first command signal, controlling the full-bridge inverter to operate in the half-bridge mode,
electronic device.

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