KR20240071951A - Power supply device for wirelessly supplying power using a plurality of coils - Google Patents

Abstract

The power supply device includes a first inverter and a second inverter configured to convert a direct current (DC) power signal received through an input stage into an alternating current (AC) power signal and output it through an output stage; A first transmitting coil connected to the output terminal of the first inverter; a second transmitting coil connected to the output terminal of the second inverter; And it may include a control circuit connected to the first inverter and the second inverter. The control circuit controls the first inverter to output a power signal to the first transmission coil, and transmits power from the power supply device to the power reception device based on the electromagnetic field generated by the first transmission coil. While monitoring the voltage at the input terminal of the second inverter, and controlling the second inverter to output a power signal to the second transmission coil based on the voltage value confirmed through the monitoring exceeding a specified threshold. It can be configured to do so.

Description

A power supply device for wirelessly supplying power using multiple coils {POWER SUPPLY DEVICE FOR WIRELESSLY SUPPLYING POWER USING A PLURALITY OF COILS}

Various embodiments relate to a power supply device that determines a coil that transmits power among power transmission coils in a wireless charging system and transmits a power signal to a power reception device through the designated transmission coil.

In a wireless charging system, a battery can be wirelessly charged using a coil. For example, a wireless charging system includes a power supply device (e.g., a charging pad or charging cradle) with a plurality of transmitting coils and a power receiving device (e.g., a smartphone, smart watch, wireless earphone charging case (or , may be configured to include a cradle).

The power supply device may sequentially transmit a designated first power signal (eg, analog ping signal) through transmission coils in order to detect nearby power reception devices. For example, when the proximity of an object is confirmed by the first power signal transmitted through the first transmission coil among the transmission coils, the power supply device transmits a second power signal (e.g., digital ping signal) through the first transmission coil. You can. The power receiving device may transmit a designated response signal (eg, signal strength packet (SSP)) to the power supply device in response to receiving the second power signal. The power supply device may transmit a power signal to the receiving coil through the first transmitting coil, based on the response signal being received through the first transmitting coil. The power receiving device may charge a battery provided in the power receiving device using the power signal received from the first transmitting coil through the receiving coil.

In a wireless charging system, while a power receiving device charges a battery using a power signal received from a power supply device, the position of the power receiving device may change. For example, a wireless charging system may be installed inside the vehicle. While driving the vehicle, an external shock due to a bump may be applied to the power receiving device, which may cause the position of the power receiving device to change.

Electrical coupling between the transmitting coil and the receiving coil is closely related to the efficiency of receiving power in the power receiving device. For example, if the position of the receiving coil changes while the transmitting coil is transmitting a power signal, the numerical value representing the electrical coupling between the two (e.g. coupling coefficient) may decrease, resulting in lower power reception efficiency. there is.

In various embodiments, the power supply device recognizes the position change of the receiving coil through electromotive force induced from the receiving coil to the transmitting coil while power is supplied from the power supply device to the power receiving device, and based on the position change, Power transmission efficiency can be increased by selectively changing the transmission coil to transmit the power signal. The technical problem to be achieved in the present disclosure is not limited to the technical problem mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

According to one embodiment, the power supply device includes a first inverter and a second inverter configured to convert a direct current (DC) power signal received through an input terminal into an alternating current (AC) power signal and output it through an output terminal; A first transmitting coil connected to the output terminal of the first inverter; a second transmitting coil connected to the output terminal of the second inverter; And it may include a control circuit connected to the first inverter and the second inverter. The control circuit may be configured to control the first inverter to output a power signal to the first transmission coil. The control circuit may be configured to monitor the voltage at the input terminal of the second inverter while power is transferred from the power supply device to the power reception device based on the electromagnetic field generated by the first transmission coil. The control circuit may be configured to control the second inverter to output a power signal to the second transmission coil based on the voltage value confirmed through the monitoring exceeding a specified threshold.

According to one embodiment, the power supply device includes a first inverter and a second inverter configured to convert a direct current (DC) power signal received through an input terminal into an alternating current (AC) power signal and output it through an output terminal; A first transmitting coil connected to the output terminal of the first inverter; a second transmitting coil connected to the output terminal of the second inverter; a control circuit connected to the first inverter and the second inverter; and a memory connected to the control circuit. The memory may store instructions that, when executed, cause the control circuit to control the first inverter to output a power signal to the first transmission coil. The instructions may cause the control circuit to monitor the voltage at the input terminal of the second inverter while power is transferred from the power supply to the power receiver based on the electromagnetic field generated by the first transmit coil. there is. The instructions may cause the control circuit to control the second inverter to output a power signal to the second transmission coil based on the voltage value confirmed through the monitoring exceeding a specified threshold.

According to one embodiment, a method of operating a power supply device includes controlling a first inverter of the power supply device to output a power signal to a first transmission coil of the power supply device; Monitoring the voltage at the input terminal of the second inverter of the power supply device while power is transferred from the power supply device to the power reception device based on the electromagnetic field generated by the first transmission coil; and controlling the second inverter to output a power signal to a second transmission coil of the power supply device based on the voltage value confirmed through the monitoring exceeding a designated threshold.

According to various embodiments, a power supply device can efficiently supply power to a power reception device using a plurality of coils. In addition, various effects that can be directly or indirectly identified through this document may be provided.

1 is a block diagram of an electronic device in a network environment, according to various embodiments.
Figure 2 shows a wireless charging system, according to one embodiment.
Figure 3 shows the configuration of a power transmission circuit in a power supply device, according to one embodiment.
Figure 4 shows the configuration of a power transmission circuit in a power supply device, according to one embodiment.
Figure 5 shows the configuration of an inverter in a power supply device, according to one embodiment.
Figure 6 is a diagram to explain the relationship between the position of the receiving coil and the DC voltage confirmed in the inverter in the inactive state.
FIG. 7 is a flowchart for explaining operations for transmitting a power signal from a power supply device to a power reception device, according to an embodiment.

1 is a block diagram of an electronic device 101 in a network environment 100, according to various embodiments. Referring to FIG. 1, in the network environment 100, the electronic device 101 communicates with the electronic device 102 through a first network 198 (e.g., a short-range wireless communication network) or a second network 199. It is possible to communicate with at least one of the electronic device 104 or the server 108 through (e.g., a long-distance wireless communication network). According to one embodiment, the electronic device 101 may communicate with the electronic device 104 through the server 108. According to one embodiment, the electronic device 101 includes a processor 120, a memory 130, an input module 150, an audio 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 may include an antenna module 197. 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 (e.g., sensor module 176, camera module 180, or antenna module 197) are integrated into one component (e.g., display module 160). It can be.

The processor 120, for example, executes software (e.g., program 140) to operate at least one other component (e.g., hardware or software component) of the electronic device 101 connected to the processor 120. It can be controlled and various data processing or calculations can be performed. According to one embodiment, as at least part of data processing or computation, the processor 120 stores commands or data received from another component (e.g., sensor module 176 or communication module 190) in volatile memory 132. The commands or data stored in the volatile memory 132 can be processed, and the resulting data can be stored in the non-volatile memory 134. According to one embodiment, the processor 120 includes a main processor 121 (e.g., a central processing unit or an application processor) or an auxiliary processor 123 that can operate independently or together (e.g., a graphics processing unit, a neural network processing unit ( It may include a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor). For example, if the electronic device 101 includes a main processor 121 and a secondary processor 123, the secondary processor 123 may be set to use lower power than the main processor 121 or be specialized for a designated function. You can. The auxiliary processor 123 may be implemented separately from the main processor 121 or as part of it.

The auxiliary processor 123 may, for example, act on behalf of the main processor 121 while the main processor 121 is in an inactive (e.g., sleep) state, or while the main processor 121 is in an active (e.g., application execution) state. ), together with the main processor 121, at least one of the components of the electronic device 101 (e.g., the display module 160, the sensor module 176, or the communication module 190) At least some of the functions or states related to can be controlled. According to one embodiment, co-processor 123 (e.g., image signal processor or communication processor) may be implemented as part of another functionally related component (e.g., camera module 180 or communication module 190). there is. According to one embodiment, the auxiliary processor 123 (eg, neural network processing device) may include a hardware structure specialized for processing artificial intelligence models. Artificial intelligence models can be created through machine learning. For example, such learning may be performed in the electronic device 101 itself on which the artificial intelligence model is performed, or may be performed through a separate server (e.g., server 108). Learning algorithms may include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but It is not limited. An artificial intelligence model may include multiple artificial neural network layers. Artificial neural networks include deep neural network (DNN), convolutional neural network (CNN), recurrent neural network (RNN), restricted boltzmann machine (RBM), belief deep network (DBN), bidirectional recurrent deep neural network (BRDNN), It may be one of deep Q-networks or a combination of two or more of the above, but is not limited to the examples described above. In addition to hardware structures, artificial intelligence models may additionally or alternatively include software structures.

The memory 130 may store various data used by at least one component (eg, the processor 120 or the sensor module 176) of the electronic device 101. Data may include, for example, input data or output data for software (e.g., program 140) and instructions related thereto. Memory 130 may include volatile memory 132 or 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 application 146.

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

The sound output module 155 may output sound signals to the outside of the electronic device 101. The sound output module 155 may include, for example, a speaker or a receiver. Speakers can be used for general purposes such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. According to one embodiment, the receiver may be implemented separately from the speaker or as part of it.

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

The audio module 170 can convert sound into an electrical signal or, conversely, convert an electrical signal into sound. According to one embodiment, the audio module 170 acquires sound through the input module 150, the sound output module 155, or an external electronic device (e.g., directly or wirelessly connected to the electronic device 101). Sound may be output through the electronic device 102 (e.g., speaker or headphone).

The sensor module 176 detects the operating state (e.g., power or temperature) of the electronic device 101 or the external environmental state (e.g., user state) and generates an electrical signal or data value corresponding to the detected state. can do. According to one embodiment, the sensor module 176 includes, for example, a gesture sensor, a gyro sensor, an air 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, humidity sensor, or light sensor.

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

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

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

The power management module 188 can manage power supplied to the electronic device 101. According to one embodiment, the power management module 188 may be implemented as at least a part of, for example, 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, the battery 189 may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

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

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

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

According to various embodiments, the antenna module 197 may form a mmWave antenna module. According to one embodiment, a mmWave antenna module includes a printed circuit board, an RFIC disposed on or adjacent to a first side (e.g., bottom side) of the printed circuit board and capable of supporting a designated high-frequency band (e.g., mmWave band); And a plurality of antennas (e.g., array antennas) disposed on or adjacent to the second side (e.g., top or side) of the printed circuit board and capable of transmitting or receiving signals in 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 (e.g., bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)) and signal ( (e.g. commands or data) can be exchanged with each other.

According to one embodiment, commands 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 of the same or different type as the electronic device 101. According to one embodiment, all or part of the operations performed in the electronic device 101 may be executed in one or more of the external electronic devices 102, 104, or 108. For example, when the electronic device 101 must perform a certain function or service automatically or in response to a request from a user or another device, the electronic device 101 may perform the function or service instead of executing the function or service on its own. Alternatively, or additionally, one or more external electronic devices may be requested to perform at least part of the function or service. One or more external electronic devices that have received the request may execute at least part of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device 101. The electronic device 101 may process the result as is or additionally and provide it as at least part of a response to the request. For this purpose, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology can 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 one embodiment, the external electronic device 104 or server 108 may be included in the second network 199. The electronic device 101 may be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

Electronic devices according to various embodiments disclosed in this document may be of various types. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to embodiments of this document are not limited to the above-described devices.

The various embodiments of this document and the terms used herein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various changes, equivalents, or replacements of the embodiments. In connection with the description of the drawings, similar reference numbers may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the above items, unless the relevant context clearly indicates otherwise. As used herein, “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C”, and “A Each of phrases such as “at least one of , B, or C” may include any one of the items listed together in the corresponding phrase, or any possible combination thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish one element from another, and may be used to distinguish such elements in other respects, such as importance or order) is not limited. One (e.g. first) component is said to be "coupled" or "connected" to another (e.g. second) component, with or without the terms "functionally" or "communicatively". Where mentioned, it means that any of the components can be connected to the other components directly (e.g. wired), 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 logic, logic block, component, or circuit, for example. It can be used as A module may be an integrated part or a minimum unit of the parts or a part thereof that performs one or more functions. According to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of the present document are one or more instructions stored in a storage medium (e.g., built-in memory 136 or external memory 138) that can be read by a machine (e.g., electronic device 101). It may be implemented as software (e.g., program 140) including these. For example, a processor (e.g., processor 120) of a device (e.g., electronic device 101) may call at least one command among one or more commands stored from a storage medium and execute it. This allows the device to be operated to perform at least one function according to the at least one instruction called. The one or more instructions may include code generated by a compiler or code that can be executed by an interpreter. A storage medium that can be read by a device 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 contain signals (e.g. electromagnetic waves). This term refers to cases where data is stored semi-permanently in the storage medium. There is no distinction between temporary storage cases.

According to one embodiment, methods according to various embodiments disclosed in this document may be provided and included in a computer program product. Computer program products are commodities and can be traded between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium (e.g. compact disc read only memory (CD-ROM)), or through an application store (e.g. Play Store ^TM ) or on two user devices (e.g. It can be distributed (e.g. downloaded or uploaded) directly between smart phones) or online. In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

According to various embodiments, each component (e.g., module or program) of the above-described components may include a single or plural entity, and some of the plurality of entities may be separately placed in other components. there is. According to various embodiments, one or more of the components or operations described above may be omitted, or one or more other components or operations may be added. Alternatively or additionally, multiple components (eg, modules or programs) may be integrated into a single 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 of the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, or omitted. Alternatively, one or more other operations may be added.

Figure 2 shows a wireless charging system, according to one embodiment. The power supply device 201 (e.g., the electronic device 102 of FIG. 1) may transmit a power signal wirelessly. The power receiving device 202 (e.g., the electronic device 101 of FIG. 1) may receive a power signal wirelessly.

According to one embodiment, the power supply device 201 includes a power source circuit 211, a power transmission circuit 212, a plurality of transmission coils 213, a first communication circuit 214, and a first communication circuit 214. It may include a control circuit 215.

The wireless charging system can perform wireless charging based on a designated protocol. For example, according to the WPC standard, wireless charging operations may include ping operations, identification & configuration operations, and power transfer operations. The ping operation may include an operation to check whether the power receiving device 202 is in close proximity to the power supply device 201 (eg, mounted on a charging pad). As an example of a ping operation, the first control circuit 215 may control the power transmission circuit 212 so that a data signal (eg, a ping signal) is sequentially transmitted through the plurality of transmission coils 213. Here, sequential transmission may mean that the data signal is transmitted sequentially from the first transmission coil to the Nth transmission coil at regular intervals. The first control circuit 215 may receive a response signal to the data signal from the power receiving device 202 through the first communication circuit 214. The first control circuit 215 may recognize the proximity of the power receiving device 202 based on reception of the response signal. Additionally, the first control circuit 215 may select the transmitting coil(s) to transmit a power signal to the power receiving device 202 from among the plurality of transmitting coils 213 based on reception of the response signal. For example, the first control circuit 215 may determine a transmission coil that causes the power receiving device 202 to respond by transmitting a data signal as a transmission coil to transmit a power signal. The identification & configuration operation may include setting the power value of the power signal to be transmitted to the power receiving device 202 through data communication between the power supply device 201 and the power receiving device 202. The power transfer operation may include an operation in which the power supply device 201 transmits a power signal having a power value set in the identification & configuration operation to the power reception device 202.

The power circuit 211 may provide a power signal to be transmitted to the power reception device 202 to the power transmission circuit 212. For example, the power circuit 211 converts the current of the power signal introduced from the outside from alternating current (AC) to direct current (DC) and converts the voltage of the power into the power signal of the first control circuit 215. Based on the control, it may include an adapter that adjusts and outputs a specified voltage value. According to one embodiment, the power circuit 211 changes the voltage of direct current (DC) power supplied from an external power device (e.g., adapter) to a different voltage based on the control of the first control circuit 215. It can be adjusted (lowering or increasing the voltage) and supplied to the power transmission circuit 212.

The power transmission circuit 212 may be configured to convert the current of the power signal received from the power circuit 211 from DC to AC to wirelessly transmit the power signal through at least one of the plurality of coils 213. . For example, the power transmission circuit 212 may include an inverter (e.g., a full bridge circuit) configured to periodically convert the direction of current to a specified frequency for wireless transmission of a power signal. Multiple coils 213 may resonate at a specific frequency. For example, the power supply device 201 further includes a resonance circuit (not shown) to cause the plurality of coils 213 to resonate at a specific frequency (e.g., a frequency specified in the wireless power consortium (WPC) standard). can do. The inverter matches the current direction of the first power signal received from the power circuit 211 to the resonant frequency of a designated transmission coil (e.g., a transmission coil selected through the ping operation) among the plurality of coils 213. By periodically converting, a second power signal having the resonance frequency can be generated and the second power signal can be output to a designated transmission coil. Accordingly, the second power signal can be wirelessly transmitted to the power receiving device 102 through a designated transmission coil. The power transmission circuit 212 is a current adjustment circuit (e.g., low drop out (LDO) regulator) that adjusts the current of the second power signal based on the control of the first control circuit 215 and transmits it to the designated transmission coil. may include.

The plurality of transmitting coils 213 are, for example, in the form of a spiral wound several times in a clockwise or counterclockwise direction around an axis perpendicular to the plane on which the power receiving device 202 is mounted in the charging pad of the power supply device 201. ) type. A power signal may be supplied from the power supply device 201 to the power reception device 202 by electrical coupling between the transmitting coil and the receiving coil. The plurality of transmitting coils 213 may be used as antennas for data communication (eg, in-band communication) in addition to power transmission.

The first communication circuit 214 may perform data communication with the power reception device 202 through a plurality of transmission coils 213. For example, the first communication circuit 214 receives a data signal from the first control circuit 215, and transmits the received data signal to a designated transmission coil (e.g., the ping operation) among the plurality of transmission coils 213. It can be transmitted to the second communication circuit 223 of the power reception device 202 by loading the power signal supplied to the power reception device 202 from the transmission coil selected through the power signal. A method of loading a data signal onto a power signal may, for example, use a technique that modulates the amplitude and/or frequency of the power signal. The first communication circuit 214 demodulates the power signal transmitted from the designated transmitting coil to the receiving coil 221, thereby transmitting the designated transmission of the power supply device 201 from the receiving coil 221 of the power receiving device 202. The data signal received by the coil can be obtained. The first communication circuit 214 may transmit the acquired data signal to the first control circuit 215.

The first control circuit (eg, microcontroller unit (MCU)) 215 may be implemented as a single chipset together with the memory configured in the power supply device 201. The first control circuit 215 may control power delivery based on information received from the power receiving device 202 through the first communication circuit 214. For example, the first control circuit 215 transmits power to periodically transmit a power signal (e.g., ping signal or wake up signal) for the purpose of detecting an external object (e.g., power receiving device 202). The circuit 212 can be controlled. The power supply device 201 monitors changes in characteristics (e.g., frequency, amplitude) of the power signal through the first communication circuit 214 and recognizes that an object exists near the power supply device 201 based on the characteristic changes. can do. For example, a characteristic change may occur in the power signal transmitted for the purpose of detecting an external object due to the object being placed on the charging pad. The first control circuit 215 may recognize that an object is close when the amount of change satisfies a specified condition (for example, if the amount of change is greater than or equal to a threshold value). For example, the first control circuit 215 may generate a first ping signal (eg, analog ping) at a designated first cycle through the power transmission circuit 212. When the proximity of an object is confirmed by the first ping signal, the first control circuit 215 sends a second ping signal (e.g., digital ping) through the power transmission circuit 212 at a specified second period (e.g., longer than the first period). can occur in short cycles). The first control circuit 215 is configured to allow a nearby object placed on the charging pad to receive power when a response to the transmission of the second ping signal (e.g., signal strength packet (SSP)) is received through the communication circuit 215. It can be recognized as a device 202. By transmitting the second ping signal, the first control circuit 215 may designate the transmitting coil that called the response of the power receiving device 202 as the coil to transmit the power signal.

The first control circuit 215 may transmit a data signal to the power reception device 202 through the first communication circuit 214 based on the presence of the power reception device 202 being recognized. Here, the first control circuit 215 may use the transmitting coil designated through the second ping signal as an antenna for data communication with the power receiving device 202. That is, the first communication circuit 214 can transmit a data signal to the power receiving device 202 through the designated transmission coil based on the control of the first control circuit 215. The data signal indicates what information the power supply device 201 requests from the power receiving device 202 and/or information requested by the power receiving device 202 from the power supply device 201 (e.g., power identification information of the supply device 201). The information requested by the power supply device 201 from the power receiving device 202 by transmitting a data signal to the power receiving device 201 includes identification information of the power receiving device 202 and/or setting information related to wireless charging ( configuration information). Identification information may include version information, manufacturing code, or device identifier. Setting information may include a wireless charging frequency, maximum receiveable power, or power required from the power supply device 201 for battery charging. The first control circuit 215 may receive the requested information as a response message from the power receiving device 202 through the first communication circuit 214. The first control circuit 215 may control the power transmission circuit 212 to transmit a power signal for the purpose of battery charging, based at least in part on the identification information and/or setting information in the received response message.

The first control circuit 215 may receive a feedback signal for controlling power supply from the power receiving device 202 through a designated transmission coil among the plurality of transmission coils 213. The feedback signal may include a control error packet (CEP) defined in the WPC standard. The control error packet may include a control error value (CEV). For example, the control error value may be an integer between -128 and +127 (e.g., -1, 0, +1). The first control circuit 215, based on the feedback signal received from the power receiving device 202, while the power transmitting circuit 212 transmits the power signal to the power receiving device 202 through the designated transmitting coil, The characteristics of the power signal (e.g., voltage, current) can be adjusted or transmission of the power signal can be terminated. For example, the first control circuit 215 may determine the voltage and/or voltage of the power signal based on an error value (e.g., CEV included in CEP) received from the power receiving device 202 through the first communication circuit 214. Alternatively, the power transmission circuit 211 can be controlled to raise or lower the frequency. For example, the error value (eg, CEV) may include a value determined by the difference between the rectified voltage (eg, V_REC) rectified at the power receiving device 202 and the target voltage specified by the power receiving device 202. For example, if the difference between the rectified voltage and the target voltage is within the specified error range, the error value is set to “0” by the power receiving device 202 and the first control circuit 215 accordingly determines the voltage of the power signal. can be maintained without change. The power receiving device 202 may transmit a control error packet with a negative control error value to the power supply device 201 to request a decrease in the amount of charging power. The power receiving device 202 may transmit a control error packet with a positive control error value to the power supply device 201 to request an increase in the amount of charging power. For example, if the rectified voltage is less than the target voltage (e.g., less than the target voltage minus a value representing the error range), the error value is a positive number (e.g., “+1”) by the power receiving device 202. ), and accordingly, the first control circuit 215 can increase the power (e.g., voltage) of the power signal output from the power transmission circuit 212 to the designated transmission coil. For example, the first control circuit 215 may control the power circuit 211 to increase the voltage level of the power signal output from the power circuit 211 to the power transmission circuit 212. As another example, the first control circuit 215 may control the power transmission circuit 212 to lower the frequency of the power signal output from the power transmission circuit 212 to a designated transmission coil. As another example, the first control circuit 215 determines the duty ratio of the power signal output from the power transmission circuit 212 to the designated transmission coil (the time when the pulse (power signal) is in the On state during one cycle). The power transmission circuit 212 can be controlled to increase the ratio). If the rectified voltage is greater than the target voltage (e.g., greater than the sum of the target voltage and the error range value), the error value is set to a negative number (e.g., “-1”) by the power receiving device 202 and accordingly the first Control circuit 215 may lower the power of the power signal. For example, the first control circuit 215 may control the power circuit 211 to lower the voltage level of the power signal output from the power circuit 211 to the power transmission circuit 212. As another example, the first control circuit 215 may control the power transmission circuit 212 to increase the frequency of the power signal output from the power transmission circuit 212 to a designated transmission coil. As another example, the first control circuit 215 may control the power transmission circuit 212 to lower the duty ratio of the power signal output from the power transmission circuit 212 to a designated transmission coil. The first control circuit 215 receives a termination signal (e.g., a packet (e.g., CS 100 Packet) transmitted by the power receiving device 202 when charging of the battery 225 is completed from the power receiving device 202 through a designated transmission coil. )), the power transmission circuit 212 can be controlled to stop outputting the power signal to the designated transmission coil.

According to one embodiment, the first control circuit 215 is configured to cause the power transmission circuit 212 to call a response from the power reception device 202 through a designated transmission coil (e.g., a ping operation) among the plurality of coils 213. While transmitting the power signal to the power receiving device 202 through the power transmitting coil (on transmitting coil), based on the data signal received from the power transmitting circuit 212, the power signal is transmitted among the plurality of transmitting coils 213. Coils can be reassigned.

A power signal with AC current is applied to a designated transmitting coil, and an electromagnetic field is formed around the receiving coil 221 by the designated transmitting coil, thereby inducing a current in the receiving coil 221. A change in the magnetic field around the receiving coil 221 is generated by the current induced in the receiving coil 221. This change in magnetic field causes the generation of induced electromotive force in a transmission coil that is not designated to transmit a power signal (hereinafter referred to as an undesignated transmission coil). Due to changes in the position of the power receiving device 202, the electrical bond between the designated transmitting coil and the receiving coil 221 may become weaker, and the bond between the unspecified transmitting coil and the receiving coil 221 may become relatively stronger. Accordingly, the induced electromotive force may increase in the unspecified transmitting coil. The first control circuit 215 may receive a data signal (eg, voltage value) representing the induced electromotive force from an unspecified transmission coil through the power transmission circuit 212. The first control circuit 215 may reassign a transmitting coil to transmit the power signal based on the received data signal.

As an example for reassigning a transmit coil, the first control circuit 215 may monitor voltage values in the data signal received from the transmit coils 213 while transmitting a power signal using the first transmit coil. You can. When the voltage value corresponding to the second transmission coil confirmed as a result of monitoring exceeds the specified first threshold, the first control circuit 215 may re-designate the transmission coil to transmit the power signal as the second transmission coil. . The first control circuit 215 may control the power transmission circuit 212 to transmit a power signal using the redirected second transmission coil. The first control circuit 215 may control the power transmission circuit 212 to stop transmission of the power signal using the first transmission coil.

As another example for reassigning a transmit coil, the first control circuit 215 may, while transmitting a power signal using the first transmit coil, determine the voltage value in the data signal received from the transmit coils 213. can be monitored. When the voltage value corresponding to the second transmission coil confirmed as a result of monitoring exceeds the specified second threshold, the first control circuit 215 may re-designate the second transmission coil as a transmission coil to transmit a power signal. . The first control circuit 215 may control the power transmission circuit 212 to transmit a power signal using the first transmission coil and the second transmission coil. The first control circuit 215 is a power transmission circuit to lower the voltage and/or current of the power signal to be output to the first transmission coil based on the voltage value corresponding to the second transmission coil exceeding the second threshold. (212) can be controlled.

In the above-described example, the second transmission coil may be closest to the first transmission coil. A target that can be reassigned for transmitting a power signal is not limited to the second transmission coil, and all transmission coils configured in the power supply device 201, including the second transmission coil, may be the target. For example, when the receiving coil 221 changes position, thereby causing the receiving coil 221 to be closer to the third transmitting coil than the second transmitting coil, and the voltage value corresponding to the third transmitting coil exceeds the specified threshold, The first control circuit 215 may control the power transmission circuit 212 to transmit a power signal using the third transmission coil. Additionally, the first control circuit 215 may control the power transmission circuit 212 to stop transmission of the power signal using the second transmission coil. Alternatively, the first control circuit 215 may control the power transmission circuit 212 to lower the voltage and/or current of the power signal to be output to the second transmission coil.

The first control circuit 215 may be composed of an integrated circuit (IC) together with the first communication circuit 214. For example, one integrated circuit may be configured to control power supply and perform wireless communication with the power receiving device 202 through a plurality of transmitting coils 213.

The first control circuit 215 may be configured separately from the first communication circuit 214. For example, the first control circuit 215 may include a microcontroller unit (MCU) and the first communication circuit 214 may include an integrated circuit configured to perform a wireless communication function.

The power receiving device 202 may include a receiving coil 221, a power receiving circuit 222, a second communication circuit 223, a charging circuit 224, a battery 225, and a second control circuit 226. You can.

The receiving coil 221 may be a spiral type coil wound several times in a clockwise or counterclockwise direction. When the power receiving device 202 is mounted on a charging pad, the receiving coil 221 may be substantially aligned with one of the plurality of transmitting coils 213. The receiving coil 221 may receive a power signal from at least one of the plurality of transmitting coils 213. The receiving coil 221 may resonate at the same frequency as the frequency at which the plurality of transmitting coils 213 resonate. The power receiving device 202 may further include a resonance circuit 227 for causing the receiving coil 221 to resonate at a specific frequency (eg, a frequency specified in the wireless power consortium (WPC) standard). The receiving coil 221 may be used as an antenna for data communication (eg, in-band communication) in addition to receiving power.

The power receiving circuit 222 may be configured to transfer the power signal received from the power supply device 201 through the receiving coil 221 to the charging circuit 224. For example, the power receiving circuit 220 includes a rectifier circuit that converts the current of the power signal from AC to DC and a DC-DC converter circuit that converts a rectified voltage (V_REC), and a charging circuit that converts the power signal into a charging circuit. It can be output as (224).

The second communication circuit 223 may perform data communication with the power supply device 201 through the receiving coil 221. For example, the second communication circuit 223 receives a data signal from the second control circuit 226, and connects the received data signal to the power signal received from the power supply device 201. It can be sent to . A method of loading a data signal onto a power signal may use the technique of modulating the amplitude and/or frequency of the power signal, as exemplified above. For example, the second communication circuit 223 can change the amplitude of the power signal by controlling the switching to open and close a switch located on the electrical path connecting the receiving coil 221 and the ground of the power receiving device 202. . The second communication circuit 223 demodulates the power signal transmitted from the power supply device 201 to the power receiving coil 551 and transmits a data signal from the power supply device 201 to the power receiving device 202. can be obtained. The second communication circuit 223 may transmit the acquired data signal to the second control circuit 226.

The charging circuit 224 may charge the battery 225 using the power signal received from the receiving coil 221 through the power receiving circuit 222 . For example, the charging circuit 224 may support constant current (CC) and constant voltage (CV) charging based on control of the second control circuit 226. For example, while the charging mode is CC mode, the charging circuit 224 adjusts the current of the power signal output from the charging circuit 224 to the battery 225 so that the voltage of the battery 225 rises to a specified target voltage value. The charging current value set by the second control circuit 226 can be maintained constant. When the voltage of the battery 225 reaches the target voltage value and the charging mode is converted from CC mode to CV mode, the charging circuit 224 outputs the charge from the charging circuit 224 under the control of the second control circuit 226. By gradually lowering the current of the power signal, the voltage of the battery 225 can be maintained at the target voltage value. While charging the battery 225 in CV mode, when the current of the power signal input to the battery 225 decreases to a specified charging completion current value (e.g., top off current value), the charging circuit 224 operates a second control circuit ( Based on the control of 226), charging of the battery 225 can be completed by stopping the output of the power signal to the battery 225.

The second control circuit (eg, processor 120 in FIG. 1 ) 226 may communicate data with the power supply device 201 through the second communication circuit 223 . The second control circuit 226 controls the power receiving circuit 222 to receive a power signal through the receiving coil 221 based on data communication and uses the received power signal to charge the battery 225. The charging circuit 224 can be controlled.

Figure 3 shows the configuration of the power transmission circuit 212 in the power supply device 201, according to one embodiment.

Referring to FIG. 3 , the power transmission circuit 212 may include inverters 310 respectively corresponding to the transmission coils 213 and converters 320 respectively corresponding to the inverters 310 .

Each of the converters 320 can convert the level of the DC voltage of the power signal received from the power circuit 211 based on the control of the first control circuit 215 and output it to the corresponding inverter. . For example, the converters 320 are each a buck converter configured to lower the output voltage compared to the input voltage and output a power signal with the lowered output voltage to the corresponding inverter, increase the output voltage compared to the input voltage, and output the increased output. It may include a boost converter configured to output a power signal with a voltage to the corresponding inverter, or a buck-boost converter configured to lower or increase the output voltage relative to the input voltage.

The inverters 310 each invert the current of the power signal received from the power circuit 211 through the converter from DC to AC based on the control of the first control circuit 215 and transmit the current to the corresponding transmission coil. It can be configured to output as .

According to one embodiment, power signal lines 330_1, 330_2, ..., 330_N respectively connect output terminals that output power signals from the converters 320 to input terminals that receive power signals from the inverters 310. This may be configured in the power supply device 201. Detection signal lines (or, monitoring) connecting specific points (or nodes) (340_1, 340_2, ..., 340_N) in the power signal lines (330_1, 330_2, ..., 330_N) to the first control circuit 215 Signal lines) (350_1, 350_2, ..., 350_N) may be configured in the power supply device 201.

According to one embodiment, the first control circuit 215 transmits a power signal to the power receiving device 202 using an inverter and a converter activated for transmission of a power signal among the inverters 310 and converters 320. ), receiving a detection signal (e.g., a voltage value) representing the electromotive force induced in the unspecified transmitting coil through the detection signal lines (350_1, 350_2, ..., 350_N), and based on the received detection signal, Only when activated can the inverter and converter be reassigned among the inverters 310 and converters 320.

As an example for reassigning the transmission circuit (inverter and converter), the first control circuit 215 is a first inverter and a first converter (hereinafter, the first inverter and the first converter are grouped into one 'first transmission circuit'). While transmitting a power signal using (referred to as ), a detection signal can be received through the detection signal lines 350_1, 350_2, ..., 350_N, and the voltage value in the received detection signal can be monitored. The first control circuit 215 operates when the voltage value confirmed as a result of monitoring the detection signal received through the detection signal line 350_2 connected to the input terminal of the second inverter in an inactive state exceeds the designated first threshold. , the second inverter and the second converter (hereinafter, the second inverter and the second converter are collectively referred to as the 'second transmission circuit') can be activated for transmission of the power signal. Accordingly, the voltage level of the power signal is converted by the second converter, the current of the power signal is converted from DC to AC by the second inverter, and the power signal can be transmitted to the power receiving device 202 through the second transmission coil. there is. The first control circuit 215 may switch the first transmission circuit from an activated state to a deactivated state so that transmission of the power signal using the first transmission circuit is stopped.

As another example for redirecting the transmission circuit, the first control circuit 215 controls the detection signal lines 350_1, 350_2, ..., 350_N while transmitting a power signal using the first transmission circuit. You can receive a detection signal and check the voltage value from the received detection signal. The first control circuit 215 operates when the voltage value confirmed as a result of monitoring the detection signal received through the detection signal line 350_2 connected to the input terminal of the second inverter in an inactive state exceeds the specified second threshold. , the second transmission circuit can be activated. The first control circuit 215 may transmit a power signal using a first transmission circuit and a second transmission circuit. The first control circuit 215 may lower the voltage and/or current of the power signal to be output from the first inverter to the first transmission coil based on the voltage value corresponding to the second inverter exceeding the second threshold. there is. For example, the first control circuit 215 may lower the voltage and/or current of the power signal to be output to the first transmission coil by controlling the first converter to lower the voltage of the power signal to be output from the output terminal of the first converter. there is.

In the above example, the target that can be reassigned for transmitting the power signal is not limited to the second transmission circuit, and all transmission circuits configured in the power supply device 201, including the second transmission circuit, may be the target. For example, if the receiving coil 221 changes position and the receiving coil 221 becomes closer to the third transmitting coil than the second transmitting coil and the voltage value corresponding to the third inverter exceeds the specified threshold, 1 The control circuit 215 may transmit a power signal using a third transmission circuit. Additionally, the first control circuit 215 may stop transmitting the power signal using the second transmission circuit. Alternatively, the first control circuit 215 may control the second converter to lower the voltage of the power signal to be output from the output terminal of the second converter.

Figure 4 shows the configuration of the power transmission circuit 212 in the power supply device 201, according to one embodiment.

Referring to FIG. 4, the power transmission circuit 212 includes inverters 410 corresponding to the transmission coils 213, switches 420 respectively corresponding to the inverters 410, and a converter 430. It can be included. The switches 420 may be configured to allow a power signal to flow from the converter 430 to the inverters 410 or to block the flow of the power signal. That is, when the switches 420 are closed, the power signal flows from the converter 430 to the inverters 410, and when the switches 420 are opened, the flow of power signals from the converter 430 to the inverters 410 is blocked. You can.

The converter 430 may convert the level of the DC voltage of the power signal received from the power circuit 211 based on the control of the first control circuit 215 and output the converted level. For example, converter 320 may include a buck converter, boost converter, or buck-boost converter. The inverters 410 each invert the current of the power signal received from the power circuit 211 through the converter 430 from DC to AC, based on the control of the first control circuit 215, and It may be configured to output to a transmitting coil.

According to one embodiment, output terminals that output power signals from the inverters 410 may be respectively connected to the transmission coils 213. Input terminals that receive power signals from the inverters 410 may each be connected to terminals of the switches 420. Other terminals of the switches 420 may be connected to an output terminal of the converter 430 that outputs a power signal. Power signal lines 440_1, 440_2, ..., 440_N, which respectively connect ends of the switches 420 to input terminals that receive power signals from the inverters 410, may be configured in the power supply device 201. there is. Sensing signal lines 460_1, 460_2 connecting specific points (or nodes) 450_1, 450_2, ..., 450_N in the power signal lines 440_1, 440_2, ..., 440_N to the first control circuit 215. , …, 460_N) may be configured in the power supply device 201.

According to one embodiment, the first control circuit 215 transmits a power signal to the power receiving device 202 using an inverter activated for transmission of the power signal among the inverters 212, while transmitting the detection signal line to the power receiving device 202. A detection signal (e.g., voltage value) representing the electromotive force induced in the unspecified transmission coil is received through the fields 460_1, 460_2, ..., 460_N, and based on the received detection signal, the inverter 310 operates the inverter to be activated. You can reassign it from among. The first control circuit 215 switches the switch from an open state (or OFF state) to a closed state (or ON state) to connect the inverter designated in the activated state to the converter 430. can do.

As an example for redirecting the inverter, the first control circuit 215 receives a detection signal through the detection signal lines 460_1, 460_2, ..., 460_N while transmitting a power signal using the first inverter. and monitor the voltage value from the received detection signal. The first control circuit 215 operates when the voltage value confirmed as a result of monitoring the detection signal received through the detection signal line 460_2 connected to the input terminal of the second inverter in an inactive state exceeds the designated first threshold. , the second inverter can be activated for transmission of the power signal. Additionally, the first control circuit 215 may switch the second switch 420_2 from an open state to a closed state so that power is supplied from the converter 430 to the second inverter. The first control circuit 215 may change the first inverter from an activated state to a deactivated state and change the first switch 420_1 from a closed state to an open state so that transmission of the power signal using the first inverter is stopped.

As another example for redirecting the inverter, the first control circuit 215 detects the signal through the detection signal lines 460_1, 460_2, ..., 460_N while transmitting a power signal using the first inverter. It is possible to receive a signal and monitor the voltage value from the received detection signal. The first control circuit 215 operates when the voltage value confirmed as a result of monitoring the detection signal received through the detection signal line 460_2 connected to the input terminal of the second inverter in an inactive state exceeds the designated first threshold. , the second inverter can be activated and the second switch 420_2 can be switched to a closed state. The first control circuit 215 may transmit a power signal using the first inverter and the second inverter. The first control circuit 215 maintains the first switch 420_1 in a closed state based on the voltage value corresponding to the second inverter exceeding the second threshold and powers the power to be output from the output terminal of the first inverter. The first inverter can be controlled to lower the voltage of the signal. A PWM (pulse width modulation) control method can be used as a method to control the output voltage in an inverter. For example, the first control circuit 215 may adjust the output voltage of the power signal by adjusting the time during which the power signal is output from the inverter to the transmission coil.

In the above-described example, the target that can be reassigned for transmitting the power signal is not limited to the second inverter, and all inverters configured in the power supply device 201, including the second inverter, may be the target. For example, if the receiving coil 221 changes position and the receiving coil 221 becomes closer to the third transmitting coil than the second transmitting coil and the voltage value corresponding to the third inverter exceeds the specified threshold, 1 The control circuit 215 closes the third switch and activates the third inverter, thereby allowing the power signal to be transmitted to the power receiving device 202 through the third transmission coil. Additionally, the first control circuit 215 can stop transmission of the power signal through the second transmission coil by opening the second switch and disabling the second inverter. Alternatively, the first control circuit 215 may control the second inverter to lower the voltage of the power signal to be output from the output terminal of the second inverter.

Figure 5 shows the configuration of the inverter 500 in the power supply device 201, according to one embodiment. Referring to FIG. 5, the inverter 500 may include multiple switches (S1, S2, S3, and S4) and multiple diodes (521, 522, 523, and 524). The inverters 310 of FIG. 3 and the inverters 410 of FIG. 4 may be implemented as the inverter 500 shown in FIG. 5 . The switches S1, S2, S3, and S4 may be implemented with, for example, a metal-oxide-semiconductor field-effect transistor (MOSFET). The diodes 521, 522, 523, and 524 may be implemented as diodes (eg, body diodes or parasitic diodes) configured inside the MOSFET.

In the inverter 500, a plurality of switches S1, S2, S3, and S4 may form a full bridge circuit. One end 511a of the first switch S1 and one end 512a of the second switch S2 are the first input terminal (e.g., positive terminal) of the inverter 500 that receives the power signal from the power circuit through the converter. It can be connected to one of the positive and negative poles) (531). One end 513a of the third switch S3 is connected to the other end 511b of the first switch S1, and one end 514a of the fourth switch S4 is connected to the other end 511b of the second switch S2. Can be connected to (512b). The other terminal 513b of the third switch S3 and the other terminal 514b of the fourth switch S4 are the second input terminal (e.g., positive terminal) of the inverter 500 that receives the power signal from the power circuit through the converter. It can be connected to the other one of the positive and negative poles) (532). The first output terminal 541, which outputs a power signal from the inverter 500 to the transmitting coil 501, connects the other terminal 511b of the first switch S1 and one terminal 513a of the third switch S3. It may be formed on a power signal line and connected to one end (501a) of the transmitting coil (501). The second output terminal 542, which outputs a power signal from the inverter 500 to the transmitting coil 501, connects the other terminal 512b of the second switch S2 and one terminal 514a of the fourth switch S4. It is formed on a power signal line and may be connected to the other end (501b) of the transmitting coil (501).

The first diode 521 is connected to both terminals 511a and 511b of the first switch S1, blocks the flow of current from the first input terminal 531 to the first output terminal 541, and It may be configured to flow current from 541 to the first input terminal 531. The second diode 522 is connected to both terminals 512a and 512b of the second switch S2, blocks the flow of current from the first input terminal 531 to the second output terminal 542, and It may be configured to flow current from 542 to the first input terminal 531. The third diode 523 is connected to both terminals 513a and 513b of the third switch S3, blocks the flow of current from the first output terminal 541 to the second input terminal 532, and It may be configured to flow current from 532 to the first output terminal 541. The fourth diode 524 is connected to both terminals 514a and 514b of the fourth switch S4, blocks the flow of current from the second output terminal 542 to the second input terminal 532, and It may be configured to flow current from 532 to the second output terminal 542.

The first control circuit 215 may control the states of the switches S1, S2, S3, and S4 and output a frequency-modulated power signal to the transmission coil 501. For example, when S1 and S4 are in a closed state (or ON state), conversely, S2 and S3 may be in an open state (or OFF state) (hereinafter, first transmission state). When S1 and S4 are in the open state, S2 and S3 may be in the closed state (hereinafter, second transmission state). The first control circuit 215 switches the first transmission state and the second transmission state to be periodically repeated according to a wireless charging standard (e.g., at a frequency specified for use in wireless charging by the wireless power consortium (WPC)). (S1, S2, S3, S4) can be controlled. Accordingly, the power signal received at the input terminals 531 and 532 is frequency modulated by switching control in which the first and second transmission states are periodically repeated, and the frequency modulated power signal is transmitted through the transmission coil 501. It may be transmitted to the power receiving device 202.

The power supply device 201 may further include a matching circuit 502 to minimize return loss of the power signal. The matching circuit 502 may be inserted into the power signal line connecting the inverter 500 and the transmission coil 501. For example, the matching circuit 502 may include a capacitor disposed between the second output terminal 542 of the inverter 542 and the other terminal 501b of the transmission coil 501. Accordingly, the power signal line connecting the inverter 500 and the transmission coil 501 can be matched to a specific impedance. The matching circuit 502 is a lumped element and may include at least one of a resistor, an inductor, or a capacitor. The matching circuit 502 may further include a strip line as a distributed element.

The power receiving device 202 includes a receiving coil 591 that receives a power signal from the power supply device 201, and a load that is driven using the power signal received from the receiving coil 591 or the power signal received from the battery ( Example: processor, display, camera) 592. The power receiving device 202 may further include a resonance circuit 593 for causing the receiving coil 591 to resonate at a specific frequency (eg, a frequency specified in the wireless power consortium (WPC) standard).

According to one embodiment, the first control circuit 215 may check the DC voltage corresponding to the electromotive force induced in the transmission coil 501 through the inverter 500 in an inactive state. In this document, the deactivated state of the inverter 500 may be defined as the switches S1, S2, S3, and S4 being all open (or OFF). The activation state may be defined as a state in which the above-described first transmission state and second transmission state are periodically repeated in order to transmit the power signal to the power receiving device 202 through the transmission coil 501. The AC voltage can be confirmed between the output stages 541 and 542 by the electromotive force induced in the transmitting coil 501. The AC voltage between the output terminals 541 and 542 is rectified by the diodes 521, 522, 523 and 524 while the inverter 500 is in an inactive state, so that the DC voltage can be confirmed between the input terminals 531 and 532. there is. The first control circuit 215 may monitor the DC voltage between the input terminals 531 and 532 while the inverter 500 is in an inactive state. A change in the position of the receiving coil 591 causes a change in DC voltage. For example, the transmitting coil 501 is a spiral type wound several times in a clockwise or counterclockwise direction around an axis perpendicular to the plane on which the power receiving device 202 is mounted on the charging pad of the power supply device 201. It could be a coil. The receiving coil 591 may also be a spiral type coil wound several times in a clockwise or counterclockwise direction around the axis. As the center of the receiving coil 591 approaches the center of the transmitting coil 501, the electrical bond between the two coils 501 and 591 becomes stronger and the electromotive force induced in the transmitting coil 501 increases. As a result, a change in the position of the receiving coil 591 may cause an increase in the DC voltage in the inverter 500.

According to one embodiment, the first control circuit 215 controls the input terminals 531 and 532 while the inverter 500 is in an inactive state and transmits a power signal from the power supply device 201 to the power receiving device 202. ), you can check the DC voltage applied between them. The first control circuit 215 may transmit a power signal through the transmitting coil 501 by switching the inverter 500 to an activated state when the confirmed DC voltage exceeds a specified threshold.

Figure 6 is a diagram to explain the relationship between the position of the receiving coil and the DC voltage confirmed in the inverter in the inactive state.

In FIG. 6, reference numeral '610' indicates a first transmission coil (Tx1) corresponding to the first inverter in an activated state in the power supply device. Reference numeral ‘620’ represents the second transmission coil (Tx2) corresponding to the second inverter in an inactive state in the power supply device. Reference numeral 630 denotes a receiving coil (Rx) in the power receiving device. The first inverter and the second inverter may be configured the same as the inverter 500 of FIG. 5. ‘Px’ represents the distance between the center of the first transmitting coil 610 and the center of the receiving coil 630. ‘DC voltage’ represents the voltage between input terminals (e.g., input terminals 531 and 532 in FIG. 5) of the second inverter in an inactive state. The ‘first coupling coefficient’ represents the electrical bonding force between the first transmitting coil 610 and the receiving coil 630. The ‘second coupling coefficient’ represents the electrical bonding force between the second transmitting coil 620 and the receiving coil 630.

Referring to FIG. 6, as Px increases (i.e., as the receiving coil 630 approaches the second transmitting coil 620), the first coupling coefficient decreases, but the second coupling coefficient and DC voltage increase together. You can check it. That is, the position of the receiving coil 630 can be indirectly confirmed through the DC voltage. According to one embodiment, when the DC voltage exceeds a specified first threshold, the first control circuit 215 deactivates the first inverter corresponding to the first transmitting coil 610 and inverts the inverter corresponding to the second transmitting coil 620. By activating the second inverter, power transmission efficiency can be improved. According to one embodiment, transmission of power is achieved by activating a second inverter corresponding to the second transmitting coil 620 together with the first inverter corresponding to the first transmitting coil 610 when the DC voltage exceeds a second specified threshold. Efficiency can be improved.

In the above description related to FIGS. 2 to 6, the prefixes “first,” “second,” and “third” are only used to distinguish the same name and do not have special meanings such as importance or order. That is not the case.

FIG. 7 is a flowchart for explaining operations for transmitting a power signal from the power supply device 201 to the power reception device 202, according to an embodiment. The power supply device 201 includes a first inverter and a second inverter configured to convert the current of the power signal received through the input terminal from DC to AC and output the power signal with the current converted to AC through the output terminal, 1 It may include a first transmission coil connected to the output terminal of the inverter, and a second transmission coil connected to the output terminal of the second inverter.

In operation 710, the first control circuit 215 of the power supply device 201 controls the input terminal of the second inverter while the power signal is transmitted by the first inverter to the power receiving device 202 through the first transmission coil. You can monitor the voltage.

In operation 720, the first control circuit 215 operates the second inverter to transmit a power signal to the power receiving device 202 through the second transmission coil, based on the voltage value confirmed through monitoring exceeding a specified threshold. can be controlled. As an example of operation 720, the first control circuit 215 may control the first inverter to stop transmitting the power signal and control the second inverter to transmit the power signal from the second transmit coil to the power receiving device 202. You can. As another example, the first control circuit 215 controls the first inverter and the second inverter such that the power signal is transmitted from the first transmission coil and the second transmission coil to the power receiving device 202, The current and/or voltage of the output power signal can be lowered.

The above-described operations may be stored as instructions in the memory of the power supply device 201 and executed by the first control circuit 215.

According to one embodiment, a power supply device (e.g., power supply device 201) converts a direct current (DC) power signal received through an input terminal into an alternating current (AC) power signal and outputs it through an output terminal. a first inverter and a second inverter configured to do so; A first transmitting coil connected to the output terminal of the first inverter; a second transmitting coil connected to the output terminal of the second inverter; And it may include a control circuit (eg, first control circuit 215) connected to the first inverter and the second inverter. The control circuit may be configured to control the first inverter to output a power signal to the first transmission coil. The control circuit may be configured to monitor the voltage at the input terminal of the second inverter while power is transferred from the power supply device to the power reception device based on the electromagnetic field generated by the first transmission coil. The control circuit may be configured to control the second inverter to output a power signal to the second transmission coil based on the voltage value confirmed through the monitoring exceeding a designated threshold.

The second inverter (e.g., inverter 500) may include a first switch, a second switch, a third switch, a fourth switch, a first diode, a second diode, a third diode, and a fourth diode. . One end of the first switch and one end of the second switch may be connected to the first input terminal of the second inverter. One end of the third switch may be connected to the other end of the first switch. One end of the fourth switch may be connected to the other end of the second switch. The other terminal of the third switch and the other terminal of the fourth switch may be connected to the second input terminal of the second inverter. The first output terminal of the second inverter may be formed on a power signal line connecting the other end of the first switch and one end of the third switch and may be connected to one end of the second transmission coil. The second output terminal of the second inverter may be formed on a power signal line connecting the other end of the second switch and one end of the fourth switch and may be connected to the other end of the second transmission coil. The first diode is connected to both ends of the first switch and is configured to block the flow of current from the first input terminal to the first output terminal and to allow current to flow from the first output terminal to the first input terminal. It can be. The second diode is connected to both ends of the second switch and is configured to block the flow of current from the first input terminal to the second output terminal and to allow current to flow from the second output terminal to the first input terminal. It can be. The third diode is connected to both ends of the third switch and is configured to block the flow of current from the first output terminal to the second input terminal and to allow current to flow from the second input terminal to the first output terminal. It can be. The fourth diode is connected to both ends of the fourth switch and is configured to block the flow of current from the second output terminal to the second input terminal and to allow current to flow from the second input terminal to the second output terminal. It can be. The control circuit may be configured to monitor the voltage between the first input terminal and the second input terminal when the first switch, the second switch, the third switch, and the fourth switch are all open. there is.

The first switch, the second switch, the third switch, and the fourth switch may include a MOSFET. The first diode, the second diode, the third diode, and the fourth diode may include a diode configured inside the MOSFET.

The power supply device includes a first converter configured to convert the level of a DC voltage of a power signal and output it to the first inverter; And it may include a second converter configured to convert the level of the DC voltage of the power signal and output it to the second inverter. The control circuit may be configured to activate the second converter and the second inverter based on the voltage value confirmed through the monitoring exceeding the threshold. The control circuit may be configured to deactivate the first converter and the first inverter so that transmission of the power signal through the first transmission coil is stopped.

The power supply device includes a first converter configured to convert the level of a DC voltage of a power signal and output it to the first inverter; And it may include a second converter configured to convert the level of the DC voltage of the power signal and output it to the second inverter. The control circuit may be configured to activate the second converter and the second inverter based on the voltage value confirmed through the monitoring exceeding the threshold. The control circuit may be configured to control the first converter to lower the voltage of the power signal to be output from the first converter to the first inverter.

The power supply device includes a converter (eg, converter 430) configured to convert the level of DC voltage of the power signal; a first switch configured to allow a power signal to flow from the converter to the first inverter or to block the flow of the power signal; and a second switch configured to allow a power signal to flow from the converter to the second inverter or to block the flow of the power signal. The control circuit closes the second switch and activates the second inverter, based on the voltage value confirmed through the monitoring exceeding the threshold, and transmission of the power signal through the first transmission coil is stopped. It may be configured to open the first switch and deactivate the first inverter as much as possible.

The power supply device includes a converter (eg, converter 430) configured to convert the level of DC voltage of the power signal; a first switch configured to allow a power signal to flow from the converter to the first inverter or to block the flow of the power signal; and a second switch configured to allow a power signal to flow from the converter to the second inverter or to block the flow of the power signal. The control circuit closes the second switch based on the voltage value confirmed through the monitoring exceeding the threshold.

It may be configured to close the second switch and activate the second inverter. The control circuit may be configured to keep the first switch in a closed state and control the first inverter to lower the voltage of the power signal to be output from the first inverter to the first transmission coil.

According to one embodiment, a power supply device (e.g., power supply device 201) converts a direct current (DC) power signal received through an input terminal into an alternating current (AC) power signal and outputs it through an output terminal. a first inverter and a second inverter configured to do so; A first transmitting coil connected to the output terminal of the first inverter; a second transmitting coil connected to the output terminal of the second inverter; A control circuit (eg, first control circuit 215) connected to the first inverter and the second inverter; and a memory connected to the control circuit. The memory may store instructions that, when executed, cause the control circuit to control the first inverter to output a power signal to the first transmission coil. The instructions may cause the control circuit to monitor the voltage at the input terminal of the second inverter while power is transferred from the power supply to the power receiver based on the electromagnetic field generated by the first transmit coil. there is. The instructions may cause the control circuit to control the second inverter to output a power signal to the second transmission coil based on the voltage value confirmed through the monitoring exceeding a specified threshold.

The second inverter (e.g., inverter 500) may include a first switch, a second switch, a third switch, a fourth switch, a first diode, a second diode, a third diode, and a fourth diode. . One end of the first switch and one end of the second switch may be connected to the first input terminal of the second inverter. One end of the third switch may be connected to the other end of the first switch. One end of the fourth switch may be connected to the other end of the second switch. The other terminal of the third switch and the other terminal of the fourth switch may be connected to the second input terminal of the second inverter. The first output terminal of the second inverter may be formed on a power signal line connecting the other end of the first switch and one end of the third switch and may be connected to one end of the second transmission coil. The second output terminal of the second inverter may be formed on a power signal line connecting the other end of the second switch and one end of the fourth switch and may be connected to the other end of the second transmission coil. The first diode is connected to both ends of the first switch and is configured to block the flow of current from the first input terminal to the first output terminal and to allow current to flow from the first output terminal to the first input terminal. It can be. The second diode is connected to both ends of the second switch and is configured to block the flow of current from the first input terminal to the second output terminal and to allow current to flow from the second output terminal to the first input terminal. It can be. The third diode is connected to both ends of the third switch and is configured to block the flow of current from the first output terminal to the second input terminal and to allow current to flow from the second input terminal to the first output terminal. It can be. The fourth diode is connected to both ends of the fourth switch and is configured to block the flow of current from the second output terminal to the second input terminal and to allow current to flow from the second input terminal to the second output terminal. It can be. The instructions cause the control circuit to monitor the voltage between the first input terminal and the second input terminal with the first switch, the second switch, the third switch, and the fourth switch all open. can do.

The first switch, the second switch, the third switch, and the fourth switch may include a MOSFET. The first diode, the second diode, the third diode, and the fourth diode may include a diode configured inside the MOSFET.

The power supply device includes a first converter configured to convert the level of a DC voltage of a power signal and output it to the first inverter; And it may include a second converter configured to convert the level of the DC voltage of the power signal and output it to the second inverter. The instructions are such that the control circuit activates the second converter and the second inverter based on the voltage value confirmed through the monitoring exceeding the threshold, and transmits a power signal through the first transmission coil. To stop this, the first converter and the first inverter can be deactivated.

The power supply device includes a first converter configured to convert the level of a DC voltage of a power signal and output it to the first inverter; And it may include a second converter configured to convert the level of the DC voltage of the power signal and output it to the second inverter. The instructions are such that the control circuit activates the second converter and the second inverter based on the voltage value confirmed through the monitoring exceeding the threshold, and controls the first converter to operate the first converter. It is possible to lower the voltage of the power signal to be output to the first inverter.

The power supply device includes a converter (eg, converter 430) configured to convert the level of DC voltage of the power signal; a first switch configured to allow a power signal to flow from the converter to the first inverter or to block the flow of the power signal; and a second switch configured to allow a power signal to flow from the converter to the second inverter or to block the flow of the power signal. The instructions are such that the control circuit closes the second switch, activates the second inverter, and transmits a power signal through the first transmission coil based on the voltage value confirmed through the monitoring exceeding the threshold. The first switch can be opened and the first inverter deactivated so that transmission is stopped.

The power supply device includes a converter (eg, converter 430) configured to convert the level of DC voltage of the power signal; a first switch configured to allow a power signal to flow from the converter to the first inverter or to block the flow of the power signal; and a second switch configured to allow a power signal to flow from the converter to the second inverter or to block the flow of the power signal. The instructions are such that the control circuit closes the second switch, closes the second switch, activates the second inverter, and operates the first switch based on the voltage value confirmed through the monitoring exceeding the threshold. may be kept in a closed state and the first inverter may be controlled to lower the voltage of the power signal to be output from the first inverter to the first transmission coil.

According to one embodiment, a method of operating a power supply device (e.g., power supply device 201) includes controlling a first inverter of the power supply device to output a power signal to a first transmission coil of the power supply device. movement; Monitoring the voltage at the input terminal of the second inverter of the power supply device while power is transferred from the power supply device to the power reception device based on the electromagnetic field generated by the first transmission coil; and controlling the second inverter to output a power signal to a second transmission coil of the power supply device based on the voltage value confirmed through the monitoring exceeding a designated threshold.

Claims (15)

In the power supply device,
A first inverter and a second inverter configured to convert a direct current (DC) power signal received through an input stage into an alternating current (AC) power signal and output it through an output stage;
A first transmitting coil connected to the output terminal of the first inverter;
a second transmitting coil connected to the output terminal of the second inverter; and
Comprising a control circuit connected to the first inverter and the second inverter, the control circuit comprising:
Controlling the first inverter to output a power signal to the first transmission coil,
Monitoring the voltage at the input terminal of the second inverter while power is transferred from the power supply device to the power receiving device based on the electromagnetic field generated by the first transmitting coil,
A power supply device configured to control the second inverter to output a power signal to the second transmission coil based on the voltage value confirmed through the monitoring exceeding a specified threshold. According to claim 1,
The second inverter includes a first switch, a second switch, a third switch, a fourth switch, a first diode, a second diode, a third diode, and a fourth diode,
One end of the first switch and one end of the second switch are connected to the first input terminal of the second inverter,
One end of the third switch is connected to the other end of the first switch,
One end of the fourth switch is connected to the other end of the second switch,
The other terminal of the third switch and the other terminal of the fourth switch are connected to the second input terminal of the second inverter,
The first output terminal of the second inverter is formed on a power signal line connecting the other end of the first switch and one end of the third switch and is connected to one end of the second transmission coil,
The second output terminal of the second inverter is formed on a power signal line connecting the other end of the second switch and one end of the fourth switch and is connected to the other end of the second transmission coil,
The first diode is connected to both ends of the first switch and is configured to block the flow of current from the first input terminal to the first output terminal and to allow current to flow from the first output terminal to the first input terminal. become,
The second diode is connected to both ends of the second switch and is configured to block the flow of current from the first input terminal to the second output terminal and to allow current to flow from the second output terminal to the first input terminal. become,
The third diode is connected to both ends of the third switch and is configured to block the flow of current from the first output terminal to the second input terminal and to allow current to flow from the second input terminal to the first output terminal. become,
The fourth diode is connected to both ends of the fourth switch and is configured to block the flow of current from the second output terminal to the second input terminal and to allow current to flow from the second input terminal to the second output terminal. become,
The control circuit is configured to monitor the voltage between the first input terminal and the second input terminal when the first switch, the second switch, the third switch, and the fourth switch are all open. Device. According to clause 2,
The first switch, the second switch, the third switch, and the fourth switch include a MOSFET,
The first diode, the second diode, the third diode, and the fourth diode include diodes configured inside the MOSFET. According to claim 1,
a first converter configured to convert the level of a DC voltage of a power signal and output it to the first inverter; and
A second converter configured to convert the level of the DC voltage of the power signal and output it to the second inverter,
The control circuit is based on the fact that the voltage value confirmed through the monitoring exceeds the threshold,
Activating the second converter and the second inverter,
A power supply device configured to deactivate the first converter and the first inverter such that transmission of a power signal through the first transmission coil is discontinued. According to claim 1,
a first converter configured to convert the level of a DC voltage of a power signal and output it to the first inverter; and
A second converter configured to convert the level of the DC voltage of the power signal and output it to the second inverter,
The control circuit is based on the fact that the voltage value confirmed through the monitoring exceeds the threshold,
Activating the second converter and the second inverter,
A power supply device configured to control the first converter to lower the voltage of a power signal to be output from the first converter to the first inverter. According to claim 1,
A converter configured to convert the level of DC voltage carried by the power signal;
a first switch configured to allow a power signal to flow from the converter to the first inverter or to block the flow of the power signal; and
A second switch configured to allow a power signal to flow from the converter to the second inverter or to block the flow of the power signal,
The control circuit is based on the fact that the voltage value confirmed through the monitoring exceeds the threshold,
Close the second switch and activate the second inverter,
A power supply device configured to open the first switch and deactivate the first inverter such that transmission of a power signal through the first transmission coil is stopped. According to claim 1,
A converter configured to convert the level of DC voltage carried by the power signal;
a first switch configured to allow a power signal to flow from the converter to the first inverter or to block the flow of the power signal; and
A second switch configured to allow a power signal to flow from the converter to the second inverter or to block the flow of the power signal,
The control circuit closes the second switch based on the voltage value confirmed through the monitoring exceeding the threshold.
Close the second switch and activate the second inverter,
A power supply device configured to keep the first switch in a closed state and control the first inverter to lower the voltage of the power signal to be output from the first inverter to the first transmission coil. In the power supply device,
A first inverter and a second inverter configured to convert a direct current (DC) power signal received through an input stage into an alternating current (AC) power signal and output it through an output stage;
A first transmitting coil connected to the output terminal of the first inverter;
a second transmitting coil connected to the output terminal of the second inverter;
a control circuit connected to the first inverter and the second inverter; and
comprising a memory connected to the control circuit,
The memory, when executed, causes the control circuit to:
Controlling the first inverter to output a power signal to the first transmission coil,
Monitoring the voltage at the input terminal of the second inverter while power is transferred from the power supply device to the power receiving device based on the electromagnetic field generated by the first transmitting coil,
A power supply device that stores instructions for controlling the second inverter to output a power signal to the second transmission coil based on the voltage value confirmed through the monitoring exceeding a designated threshold. According to clause 8,
The second inverter includes a first switch, a second switch, a third switch, a fourth switch, a first diode, a second diode, a third diode, and a fourth diode,
One end of the first switch and one end of the second switch are connected to the first input terminal of the second inverter,
One end of the third switch is connected to the other end of the first switch,
One end of the fourth switch is connected to the other end of the second switch,
The other terminal of the third switch and the other terminal of the fourth switch are connected to the second input terminal of the second inverter,
The first output terminal of the second inverter is formed on a power signal line connecting the other end of the first switch and one end of the third switch and is connected to one end of the second transmission coil,
The second output terminal of the second inverter is formed on a power signal line connecting the other end of the second switch and one end of the fourth switch and is connected to the other end of the second transmission coil,
The first diode is connected to both ends of the first switch and is configured to block the flow of current from the first input terminal to the first output terminal and to allow current to flow from the first output terminal to the first input terminal. become,
The second diode is connected to both ends of the second switch and is configured to block the flow of current from the first input terminal to the second output terminal and to allow current to flow from the second output terminal to the first input terminal. become,
The third diode is connected to both ends of the third switch and is configured to block the flow of current from the first output terminal to the second input terminal and to allow current to flow from the second input terminal to the first output terminal. become,
The fourth diode is connected to both ends of the fourth switch and is configured to block the flow of current from the second output terminal to the second input terminal and to allow current to flow from the second input terminal to the second output terminal. become,
The instructions cause the control circuit to monitor the voltage between the first input terminal and the second input terminal with the first switch, the second switch, the third switch, and the fourth switch all open. power supply device. According to clause 9,
The first switch, the second switch, the third switch, and the fourth switch include a MOSFET,
The first diode, the second diode, the third diode, and the fourth diode include diodes configured inside the MOSFET. According to clause 8,
a first converter configured to convert the level of a DC voltage of a power signal and output it to the first inverter; and
A second converter configured to convert the level of the DC voltage of the power signal and output it to the second inverter,
The instructions are performed by the control circuit based on the voltage value confirmed through the monitoring exceeding the threshold,
Activating the second converter and the second inverter,
A power supply device configured to deactivate the first converter and the first inverter so that transmission of a power signal through the first transmission coil is stopped. According to clause 8,
a first converter configured to convert the level of a DC voltage of a power signal and output it to the first inverter; and
A second converter configured to convert the level of the DC voltage of the power signal and output it to the second inverter,
The instructions are performed by the control circuit based on the voltage value confirmed through the monitoring exceeding the threshold,
Activating the second converter and the second inverter,
A power supply device that controls the first converter to lower the voltage of the power signal to be output from the first converter to the first inverter. According to clause 8,
A converter configured to convert the level of DC voltage carried by the power signal;
a first switch configured to allow a power signal to flow from the converter to the first inverter or to block the flow of the power signal; and
A second switch configured to allow a power signal to flow from the converter to the second inverter or to block the flow of the power signal,
The instructions are performed by the control circuit based on the voltage value confirmed through the monitoring exceeding the threshold,
Close the second switch and activate the second inverter,
A power supply device that opens the first switch and deactivates the first inverter so that transmission of a power signal through the first transmission coil is stopped. According to clause 8,
A converter configured to convert the level of DC voltage carried by the power signal;
a first switch configured to allow a power signal to flow from the converter to the first inverter or to block the flow of the power signal; and
A second switch configured to allow a power signal to flow from the converter to the second inverter or to block the flow of the power signal,
The instructions cause the control circuit to close the second switch based on the voltage value confirmed through the monitoring exceeding the threshold.
Close the second switch and activate the second inverter,
A power supply device that keeps the first switch in a closed state and controls the first inverter to lower the voltage of the power signal to be output from the first inverter to the first transmission coil. In a method of operating a power supply device,
Controlling a first inverter of the power supply device to output a power signal to a first transmission coil of the power supply device;
Monitoring the voltage at the input terminal of the second inverter of the power supply device while power is transferred from the power supply device to the power reception device based on the electromagnetic field generated by the first transmission coil; and
A method comprising controlling the second inverter to output a power signal to a second transmission coil of the power supply device based on the voltage value confirmed through the monitoring exceeding a specified threshold.

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