Wireless power reception device and operation method thereof

Abstract

A wireless power reception device according to an embodiment of the present disclosure may comprise: a battery; a wireless power reception circuit for wirelessly receiving power from a wireless power transmission device and charging the battery with the received power; and a processor for, when the power mode of the wireless power reception device is a standby mode and the amount of charge in the battery exceeds a reference amount of charge, transmitting, to the wireless power transmission device, an operation-off signal for turning off the operation of the wireless power transmission device.

Description

Wireless power receiving device and its operating method

[0001] The present disclosure relates to a wireless power receiving device, and more particularly, to a wireless power receiving device capable of reducing standby power.

[0002] Digital TV services utilizing wired or wireless networks are becoming more widespread. Digital TV services can offer a variety of services not available with existing analog broadcasting services.

[0003] For example, IPTV (Internet Protocol Television), a type of digital TV service, and smart TV services offer interactivity, allowing users to actively choose the type of program they want to watch and when. Building on this interactivity, IPTV and smart TV services can also offer a variety of additional services, such as internet search, home shopping, and online games.

[0004] Modern TVs are equipped with batteries, and the batteries can be charged with power received wirelessly from wireless power transmission devices.

[0005] To transition a TV from standby mode to power-on mode, power is required to the standby circuit. While in standby mode, a constant supply of power is provided to the TV via the wireless power transfer circuit from the adapter.

[0006] When the TV is in standby mode, the average power consumed over a period of time must be below the standard power.

[0007] However, a problem may arise in which the standby power exceeds the standard power (e.g., 0.5 W) due to power loss in the adapter that occurs in the process of converting AC power to DC power and power loss due to the operation of the wireless power circuit connected to the rear end of the adapter.

[0008] An object of the present disclosure may be to reduce standby power in a display device that receives power wirelessly, thereby satisfying standard specifications for standby power.

[0009] The purpose of the present disclosure may be to provide a display device equipped with a wireless charging system to improve customer convenience in using a portable TV while moving.

[0010] An object of the present disclosure may be to reduce power loss occurring during a wireless power transmission process by supplying power to a standby circuit using a battery provided in a display device.

[0011] A wireless power receiving device according to an embodiment of the present disclosure may include a wireless power receiving circuit that wirelessly receives power from a battery, a wireless power transmission device, and charges the battery with the received power, and a processor that transmits an operation off signal to the wireless power transmission device to turn off the operation of the wireless power transmission device when the power mode of the wireless power receiving device is a standby mode and the charge amount of the battery exceeds a reference charge amount.

[0012] According to an embodiment of the present disclosure, the standby power required under the standby mode of the TV can satisfy the standard power.

[0013] According to an embodiment of the present disclosure, power loss occurring during a wireless power transmission process can be significantly reduced by supplying power to a standby circuit using a battery provided in a display device.

[0014] Figure 1 is a block diagram illustrating the configuration of a display device according to one embodiment of the present invention.

[0015] FIG. 2 is a drawing illustrating the configuration of a wireless power system according to an embodiment of the present disclosure.

[0016] FIG. 3a is a drawing illustrating a detailed configuration of a wireless power system according to an embodiment of the present disclosure, and FIG. 3b is a drawing illustrating a configuration of a wireless power system including a detachable type wireless power transmission device according to an embodiment of the present disclosure.

[0017] FIG. 4 is a flowchart for explaining an operating method of a wireless power receiving device according to an embodiment of the present disclosure.

[0018] FIG. 5 is a drawing illustrating the configuration of a standby circuit according to one embodiment of the present disclosure.

[0019] FIG. 6a is a drawing explaining a process of transmitting a power control signal through conventional in-band communication, and FIG. 6b is a drawing explaining a problem that occurs when transmitting a power control signal through in-band communication.

[0020] Hereinafter, embodiments related to the present invention will be described in more detail with reference to the drawings. The suffixes "module" and "part" used in the following description for components are assigned or used interchangeably solely for the convenience of writing the specification, and do not in themselves have distinct meanings or roles.

[0021] A display device according to an embodiment of the present invention is, for example, an intelligent display device that adds computer-assisted functionality to its broadcast reception function. While faithfully performing the broadcast reception function, it can also be equipped with Internet functionality and other features, providing a more user-friendly interface, such as a manual input device, touch screen, or space remote control. Furthermore, with support for wired or wireless Internet functionality, it can connect to the Internet and a computer, enabling functions such as email, web browsing, banking, or gaming. A standardized, general-purpose operating system can be used for these various functions.

[0022] Accordingly, the display device described in the present invention can perform various user-friendly functions, for example, by allowing various applications to be freely added or deleted on a general-purpose operating system kernel. More specifically, the display device can be a network TV, HBB TV, smart TV, LED TV, OLED TV, etc., and in some cases, it can also be applied to smartphones.

[0023] FIG. 1 is a block diagram illustrating the configuration of a display device according to one embodiment of the present invention.

[0024] Referring to FIG. 1, the display device (100) may include a broadcast receiving unit (130), an external device interface (135), a memory (140), a user input interface (150), a controller (170), a wireless communication interface (173), a display (180), a speaker (185), and a power supply circuit (190).

[0025] The broadcast receiving unit (130) may include a tuner (131), a demodulator (132), and a network interface (133).

[0026] The tuner (131) can select a specific broadcast channel according to a channel selection command. The tuner (131) can receive a broadcast signal for the selected specific broadcast channel.

[0027] A demodulator (132) can separate a received broadcast signal into a video signal, an audio signal, and a data signal related to a broadcast program, and can restore the separated video signal, audio signal, and data signal into a form that can be output.

[0028] The external device interface (135) can receive an application or a list of applications within an adjacent external device and transmit it to the controller (170) or memory (140).

[0029] The external device interface (135) can provide a connection path between the display device (100) and the external device. The external device interface (135) can receive one or more of images and audio output from an external device connected wirelessly or wiredly to the display device (100) and transmit them to the controller (170). The external device interface (135) can include a plurality of external input terminals. The plurality of external input terminals can include an RGB terminal, one or more HDMI (High Definition Multimedia Interface) terminals, and a component terminal.

[0030] A video signal of an external device input through an external device interface (135) can be output through a display (180). A voice signal of an external device input through an external device interface (135) can be output through a speaker (185).

[0031] An external device that can be connected to the external device interface (135) may be any one of a set-top box, a Blu-ray player, a DVD player, a game console, a sound bar, a smartphone, a PC, a USB memory, and a home theater, but this is only an example.

[0032] The network interface (133) may provide an interface for connecting the display device (100) to a wired / wireless network including the Internet. The network interface (133) may transmit or receive data to or from other users or other electronic devices via the connected network or another network linked to the connected network.

[0033] Additionally, some content data stored in the display device (100) can be transmitted to a selected user or electronic device among other users or other electronic devices pre-registered in the display device (100).

[0034] The network interface (133) can access a predetermined web page through a connected network or another network linked to the connected network. That is, by accessing a predetermined web page through a network, data can be transmitted or received with the corresponding server.

[0035] In addition, the network interface (133) can receive content or data provided by a content provider or network operator. That is, the network interface (133) can receive content such as movies, advertisements, games, VOD, broadcast signals, etc. and information related thereto provided from a content provider or network provider via a network.

[0036] Additionally, the network interface (133) can receive firmware update information and update files provided by the network operator, and can transmit data to the Internet or content provider or network operator.

[0037] The network interface (133) can select and receive a desired application from among applications open to the public via a network.

[0038] The memory (140) stores a program for each signal processing and control within the controller (170), and can store signal-processed image, voice, or data signals.

[0039] In addition, the memory (140) may perform a function for temporary storage of video, audio, or data signals input from an external device interface (135) or a network interface (133), and may store information about a specific image through a channel memory function.

[0040] The memory (140) can store an application or a list of applications input from an external device interface (135) or a network interface (133).

[0041] The display device (100) can play content files (video files, still image files, music files, document files, application files, etc.) stored in the memory (140) and provide them to the user.

[0042] The user input interface (150) can transmit a signal input by the user to the controller (170) or transmit a signal from the controller (170) to the user. For example, the user input interface (150) can receive and process control signals such as power on / off, channel selection, and screen setting from the remote control device (200) according to various communication methods such as Bluetooth, Ultra Wideband (WB), ZigBee, Radio Frequency (RF) communication, or infrared (IR) communication, or process control signals from the controller (170) to be transmitted to the remote control device (200).

[0043] In addition, the user input interface (150) can transmit control signals input from local keys (not shown) such as a power key, channel key, volume key, and setting value to the controller (170).

[0044] An image signal processed by the controller (170) can be input to the display (180) and displayed as an image corresponding to the image signal. In addition, an image signal processed by the controller (170) can be input to an external output device through an external device interface (135).

[0045] The voice signal processed by the controller (170) can be output as audio to the speaker (185). In addition, the voice signal processed by the controller (170) can be input to an external output device through the external device interface (135).

[0046] In addition, the controller (170) can control the overall operation within the display device (100).

[0047] In addition, the controller (170) can control the display device (100) by a user command or internal program input through the user input interface (150), and can connect to a network to enable the user to download a desired application or application list into the display device (100).

[0048] The controller (170) enables the user-selected channel information, etc. to be output through a display (180) or speaker (185) together with processed video or audio signals.

[0049] In addition, the controller (170) allows a video signal or audio signal from an external device, for example, a camera or camcorder, input through the external device interface (135) to be output through the display (180) or speaker (185) in accordance with an external device video playback command received through the user input interface (150).

[0050] Meanwhile, the controller (170) can control the display (180) to display an image, for example, a broadcast image input through a tuner (131), an external input image input through an external device interface (135), an image input through a network interface, or an image stored in a memory (140) can be controlled to be displayed on the display (180). In this case, the image displayed on the display (180) can be a still image or a moving image, and can be a 2D image or a 3D image.

[0051] In addition, the controller (170) can control the playback of content stored in the display device (100), received broadcast content, or external input content input from outside, and the content can be in various forms such as broadcast video, external input video, audio file, still image, connected web screen, and document file.

[0052] The wireless communication interface (173) can communicate with an external device through wired or wireless communication. The wireless communication interface (173) can perform short-range communication with the external device. To this end, the wireless communication interface (173) can support short-range communication using at least one of Bluetooth™, RFID (Radio Frequency Identification), Infrared Data Association (IrDA), UWB (Ultra Wideband), ZigBee, NFC (Near Field Communication), Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technologies. This wireless communication interface (173) can support wireless communication between the display device (100) and a wireless communication system, between the display device (100) and another display device (100), or between the display device (100) and a network in which the display device (100, or an external server) is located via a short-range wireless communication network (Wireless Area Network). The short-range wireless communication network can be a short-range wireless personal area network (Wireless Personal Area Network).

[0053] Here, the other display device (100) may be a wearable device (e.g., a smartwatch, smart glasses, a head-mounted display (HMD)) or a mobile terminal such as a smart phone that can exchange data with (or be linked to) the display device (100) according to the present invention. The wireless communication interface (173) may detect (or recognize) a wearable device capable of communication around the display device (100).

[0054] Furthermore, if the detected wearable device is a device certified to communicate with the display device (100) according to the present invention, the controller (170) can transmit at least a portion of the data processed in the display device (100) to the wearable device via the wireless communication interface (173). Accordingly, a user of the wearable device can utilize the data processed in the display device (100) via the wearable device.

[0055] The display (180) can generate a driving signal by converting a video signal, data signal, OSD signal processed by the controller (170) or a video signal, data signal, etc. received from an external device interface (135) into R, G, and B signals, respectively.

[0056] Meanwhile, since the display device (100) illustrated in FIG. 1 is merely an embodiment of the present invention, some of the illustrated components may be integrated, added, or omitted depending on the specifications of the display device (100) actually implemented.

[0057] That is, two or more components may be combined into a single component, or a single component may be subdivided into two or more components, as needed. Furthermore, the functions performed by each block are intended to illustrate embodiments of the present invention, and their specific operations or devices do not limit the scope of the present invention.

[0058] According to another embodiment of the present invention, the display device (100) may receive and play back an image through a network interface (133) or an external device interface (135) without having a tuner (131) and a demodulator (132), unlike that shown in FIG. 1.

[0059] For example, the display device (100) may be implemented separately as an image processing device, such as a set-top box, for receiving broadcast signals or contents according to various network services, and a content playback device for playing contents input from the image processing device.

[0060] In this case, the operating method of the display device according to the embodiment of the present invention to be described below may be performed by any one of the display device (100) described with reference to FIG. 1, as well as an image processing device such as the separated set-top box, or a content playback device having a display (180) and a speaker (185).

[0061] FIG. 2 is a drawing illustrating the configuration of a wireless power system according to an embodiment of the present disclosure.

[0062] Referring to FIG. 2, a wireless power system (20) according to an embodiment of the present disclosure may include a wireless power transmission device (20-1) and a wireless power reception device (20-3).

[0063] A wireless power transmission device (20-1) can wirelessly transmit power to a wireless power reception device (20-3) based on power received from an external power source.

[0064] A wireless power transmission device (20-1) can wirelessly transmit power to a wireless power reception device (20-3) using either a magnetic induction method or a magnetic resonance method.

[0065] The wireless power transmission device (20-1) may have a portable structure and may have a detachable structure to the wireless power reception device (20-3).

[0066] The wireless power receiving device (20-3) can wirelessly receive power from the wireless power transmitting device (20-1).

[0067] A wireless power receiving device (20-3) can be provided in the display device (100) of FIG. 1.

[0068] The wireless power receiving device (20-3) may be included in the power supply circuit (190) of FIG. 1.

[0069] A wireless power receiving device (20-3) can charge a battery by supplying wirelessly received power to a battery installed internally or externally.

[0070] Hereinafter, direct current power may be a term that can be replaced with direct current voltage or direct current, and alternating current power may be a term that can be replaced with alternating current voltage or alternating current.

[0071] FIG. 3a is a drawing illustrating a detailed configuration of a wireless power system according to an embodiment of the present disclosure, and FIG. 3b is a drawing illustrating a configuration of a wireless power system including a detachable type wireless power transmission device according to an embodiment of the present disclosure.

[0072] A wireless power transmission device (20-1) may include an inverter (211), a transmitting coil (213), a low-power Bluetooth circuit (215), and a microcomputer (or microcomputer, 217).

[0073] The inverter (211) can receive direct current power from the adapter (32). The adapter (32) equipped with a rectifier can convert AC power received from the AC power source (31) into DC power and supply the converted DC power to the inverter (211). For example, the adapter (32) can supply a DC voltage of 20 V to the inverter (211).

[0074] When the adapter (32) is connected to an AC power source (31) via a plug, it can convert AC power received from the AC power source (31) into DC power.

[0075] The inverter (211) can convert direct current power supplied from the adapter (32) into alternating current power. The inverter (211) can apply alternating current to the transmitting coil (213). The inverter (211) can generate alternating current power having a frequency of 128 KHz.

[0076] The inverter (211) may include a plurality of switching elements for converting direct current power into alternating current power. Each switching element may be either a metal oxide semiconductor field effect transistor (MOSFET) or an insulated gate bipolar transistor (IGBT).

[0077] The transmitting coil (213) can wirelessly transmit power to the receiving coil (231) based on the AC power received from the inverter (211).

[0078] The transmitting coil (213) can generate a magnetic field by an alternating current received from the inverter (211) and transmit the generated magnetic field to the receiving coil (231).

[0079] The receiving coil (231) can generate AC power by inducing a current by the generated magnetic field.

[0080] The transmitting coil (213) can wirelessly transmit power to the receiving coil (231) by magnetic induction. If the wireless power transmission method follows the magnetic resonance method, two coils are required for each of the wireless power transmission circuit (210) and the wireless power receiving circuit (230).

[0081] Specifically, under the magnetic resonance method, the wireless power transmission circuit (210) may include a first transmitting coil and a second transmitting coil, and the wireless power reception circuit (230) may include a first receiving coil and a second receiving coil. When a current flows in the first transmitting coil and a magnetic field is generated, a current is induced in the second transmitting coil. When the resonant frequency between the second transmitting coil and the first receiving coil matches, the magnetic field of the second transmitting coil can be transferred to the first receiving coil. Due to the magnetic field transferred to the first receiving coil, a current is induced in the second receiving coil, and AC power can be generated.

[0082] In the embodiments of the present disclosure, a magnetic induction method is assumed and explained.

[0083] The BLE circuit (215) can communicate with a wireless power receiving device (20-3) according to the BLE standard.

[0084] The BLE circuit (215) can communicate with the BLE circuit (236) provided in the wireless power receiving device (20-3).

[0085] The BLE circuit (215) can receive one or more of a power control signal or status information of the wireless power receiving device (20-3) from the BLE circuit (236) provided in the wireless power receiving device (20-3).

[0086] The power control signal may include either an operation on signal for turning on the operation of the wireless power transmission circuit (20-1) or an operation off signal for turning off the operation of the wireless power transmission circuit (20-1).

[0087] The status information of the wireless power receiving device (20-3) may include one or more of the power consumption of the wireless power receiving device (20-3) or the charging status of the battery (234).

[0088] The microcomputer (217) can control the overall operation of the wireless power transmission device (20-1).

[0089] The microcomputer (217) can control the amount of power transmitted to the wireless power receiving device (20-3) based on a power control signal received from the wireless power receiving device (20-3).

[0090] The microcomputer (217) can operate the wireless power transmission circuit (210) only when the charging voltage of the battery (234) provided in the wireless power receiving device (20-3) is discharged below the reference voltage.

[0091] The wireless power receiving device (20-3) may include a receiving coil (231), a rectifier circuit (232), a DC / DC converter (233), a battery (234), a standby circuit (235), a BLE circuit (236), and a processor (237).

[0092] The receiving coil (231) can wirelessly receive power from the transmitting coil (213). The receiving coil (231) can generate AC power by inducing a current due to the magnetic field formed by the transmitting coil (213).

[0093] The rectifier circuit (232) can rectify the AC power generated by the receiving coil (231) and output DC power.

[0094] The DC / DC (direct current / direct current) converter (233) can adjust the size of the direct current power output from the rectifier circuit (232) and output it to the battery (234).

[0095] The battery (234) can be charged via direct current power provided from the DC / DC converter (233).

[0096] The standby circuit (235) may be a circuit that waits for a user input. The standby circuit (235) may include an IR receiving circuit for receiving an IR signal from a remote control device (200). The standby circuit (235) may further include an LED indicator that indicates the power on / off status of the wireless power receiving device (20-3) or the power on / off status of the display device (100). The LED indicator may include an LED (Light Emitting Diode).

[0097] The standby circuit (235) may be a circuit that waits for reception of an IR signal under the standby mode of the wireless power receiving device (20-3). The battery (234) may supply power to the standby circuit (235).

[0098] The standby circuit (235) may be a circuit that waits for an IR signal to control the power of the display device (100).

[0099] The BLE circuit (236) can communicate with the BLE circuit (215) of the wireless power transmission device (20-1).

[0100] The processor (237) can control the overall operation of the wireless power receiving device (20-3). The processor (237) can be included in the controller (170) of FIG. 1.

[0101] The processor (237) can enter the power mode of the wireless power receiving device (20-3) into the power on mode.

[0102] The processor (237) can determine whether the power mode of the wireless power receiving device (20-3) enters the standby mode.

[0103] The processor (237) can turn off the operation of the wireless power receiving circuit (230) when the power mode of the wireless power receiving device (20-3) enters the standby mode.

[0104] The processor (237) can transmit an operation off signal to the wireless power transmission device (20-1).

[0105] The processor (237) can determine whether the charge amount of the battery (234) exceeds the reference charge amount.

[0106] When the processor (237) determines that the charge level of the battery (234) is less than or equal to the reference charge level, it can transmit an operation-on signal to the wireless power transmission device (20-1).

[0107] The processor (237) can wirelessly receive power from the wireless power transmission device (20-1) in response to an operation on signal.

[0108] Referring to FIG. 3b, the wireless power transmission device (20-1) can be detachably attached to one side of the display device (100). The wireless power transmission device (20-1) can face the wireless power reception device (20-3) and wirelessly supply power to the wireless power reception device (20-3).

[0109] The wireless power receiving device (20-3) may be built into the display device (100) or may be provided separately from the display device (100). If the wireless power receiving device (20-3) is provided separately from the display device (100), only the battery (234) may be provided in the display device (100). In this case, the wireless power receiving device (20-3) may supply the received power to the connected battery (234).

[0110] FIG. 4 is a flowchart for explaining an operating method of a wireless power receiving device according to an embodiment of the present disclosure.

[0111] The processor (237) of the wireless power receiving device (20-3) can enter the power mode of the wireless power receiving device (20-3) into the power on mode (S401).

[0112] The power mode of the wireless power receiving device (20-3) may include a power-on mode and a standby mode.

[0113] The power-on mode may be a mode in which direct current power received through the adapter (32) is received by the wireless power receiving circuit (230) through the wireless power transmission circuit (210), and power is supplied to the battery (234) and components of the wireless power receiving device (20-3) other than the battery (234).

[0114] In particular, the power on mode may be a mode in which power received from the wireless power transmission device (20-1) is supplied to each of the battery (234) and the standby circuit (235).

[0115] The standby mode is a mode for minimizing power consumption, and may be a mode in which power received from the wireless power transmission device (20-1) is supplied only to the standby circuit (235).

[0116] The processor (237) can determine whether the power mode of the wireless power receiving device (20-3) enters the standby mode (S403).

[0117] In one embodiment, when the processor (237) receives a power-off command to turn off the power of the display device (100) from the remote control device (200), the processor (237) can switch the power mode of the wireless power receiving device (20-3) from the power-on mode to the standby mode. That is, when the processor (237) receives a power-off command from the remote control device (200), the processor can switch the power mode of the wireless power receiving device (20-3) to the standby mode.

[0118] The processor (237) can turn off the operation of the wireless power receiving circuit (230) when the power mode of the wireless power receiving device (20-3) enters the standby mode (S405).

[0119] When the power mode of the wireless power receiving device (20-3) enters the standby mode, the processor (237) can turn off one or more components included in the wireless power receiving circuit (230).

[0120] For example, the processor (237) can turn off the DC / DC converter (233) when the power mode of the wireless power receiving device (20-3) enters the standby mode. The processor (237) can turn off the switching elements included in the DC / DC converter (233) when the power mode of the wireless power receiving device (20-3) enters the standby mode.

[0121] As the switching elements included in the DC / DC converter (233) are turned off, power consumption caused by the switching operation can be prevented.

[0122] The processor (237) can transmit an operation off signal to the wireless power transmission device (20-1) (S407).

[0123] When the power mode of the wireless power receiving device (20-3) enters the standby mode, the processor (237) can transmit an operation off signal to the wireless power transmitting device (20-1) to turn off the operation of the wireless power receiving circuit (230) and at the same time turn off the operation of the wireless power transmitting circuit (210).

[0124] The operation off signal may be a signal for turning off the operation of switching elements included in the inverter (211) included in the wireless power transmission device (20-1).

[0125] The processor (237) can transmit an operation off signal to the BLE circuit (215) of the wireless power receiving device (20-1) through the BLE circuit (236) of the wireless power transmitting device (20-3).

[0126] That is, the processor (237) can transmit an operation off signal to the wireless power transmission device (20-1) through the BLE standard.

[0127] In the past, power control signals were transmitted to a wireless power transmission device (20-1) via in-band communication, but in the embodiment of the present disclosure, power control signals can be transmitted via the BLE standard. This will be described later.

[0128] Meanwhile, the processor (237) can turn off the operation of the BLE circuit (236) after transmitting an operation off signal to the wireless power transmission device (20-1) through the BLE circuit (236). Accordingly, the power consumed due to the activation of the BLE circuit (236) in standby mode can also be reduced.

[0129] The processor (237) can determine whether the charge amount of the battery (234) exceeds the reference charge amount (S409).

[0130] The charge amount of the battery (234) may be expressed by any one of the charging voltage, charging current, or SOC (State Of Charge) of the battery (234). For example, the reference charge amount may be 20 V, but this is merely an example.

[0131] The processor (237) can monitor the charge level of the battery (234). The processor (237) can generate a power control signal for power control of the wireless power transmission device (20-1) based on the charge level of the monitored battery (234).

[0132] When the charge amount of the monitored battery (234) is less than or equal to a reference charge amount, the processor (237) can generate a power control signal to cause the charge amount of the battery (234) to exceed the reference charge amount.

[0133] The processor (237) can keep the wireless power receiving circuit (230) from being turned off when the charge amount of the battery (234) exceeds the reference charge amount (S405). In addition, since an operation-off signal has already been transmitted to the wireless power transmission device (20-1), the wireless transmission circuit (210) can also be turned off.

[0134] Accordingly, the adapter (32) does not need to convert AC power into DC power, so there is no loss due to power conversion of the adapter (32).

[0135] The microcomputer (217) can transmit a conversion off signal to the adapter (32) according to the operation off signal received from the processor (237). The conversion off signal may be a signal that turns off the function of the adapter (32) that converts AC power into DC power. The processor (237) may include the conversion off signal in the operation off signal, or may transmit the conversion off signal separately to the microcomputer (217).

[0136] When the charge amount of the battery (234) exceeds the standard charge amount, the operation of the adapter (32), the wireless power transmission circuit (210), and the wireless power reception circuit (230) may be turned off.

[0137] Accordingly, the loss due to power conversion of the adapter (32), the loss due to power conversion of the inverter (211), the loss due to power conversion of the rectifier circuit (232), and the loss due to power conversion of the DC / DC converter (233) can all be reduced.

[0138] In addition, the switching operation of the inverter (211) provided in the wireless power transmission circuit (210) becomes unnecessary, so that power loss caused by the switching operation can be reduced.

[0139] In this way, according to the embodiment of the present disclosure, the problem of the standby power required under the standby mode of the wireless power receiving device (20-3) exceeding the standard power can be prevented.

[0140] Meanwhile, the processor (237) may transmit an operation off signal to the wireless power transmission device (20-1) through the BLE circuit (236) and then turn off the BLE circuit (236) to save power. Turning off the BLE circuit (236) may mean cutting off power supplied to the BLE circuit (236), and turning on the BLE circuit (236) may mean supplying power to the BLE circuit (236).

[0141] If the processor (237) determines that the charge level of the battery (234) is less than or equal to the reference charge level, it can transmit an operation-on signal to the wireless power transmission device (20-1) (S411).

[0142] When the processor (237) determines that the charge amount of the battery (234) has been discharged below the reference charge amount, it can control an operation-on signal to turn on the operation of the wireless power transmission device (20-1) for charging the battery (234).

[0143] The operation on signal may be a signal that controls the wireless power transmission device (20-1) to wirelessly transmit power to the wireless power reception device (20-1).

[0144] The processor (237) can transmit an operation-on signal to the wireless power receiving device (20-1) through the BLE circuit (236). In one embodiment, the processor (237) can turn the BLE circuit (236) in the power-off state back on, and transmit the operation-on signal to the wireless power receiving device (20-1) through the BLE circuit (236). In this process, the processor (237) can supply the power remaining in the battery (234) to the BLE circuit (236) to turn on the BLE circuit (236).

[0145] The microcomputer (217) can turn on the operation of the inverter (211) in response to the received operation-on signal. The microcomputer (217) can turn on the operation of a plurality of switching elements provided in the inverter (211) in response to the operation-on signal.

[0146] The inverter (211) can convert direct current power received from the adapter (32) into alternating current power and transmit the converted alternating current power to the transmission coil (213).

[0147] The processor (237) can wirelessly receive power from the wireless power transmission device (20-1) in response to an operation on signal (S413).

[0148] The transmitting coil (213) can wirelessly transmit AC power generated based on AC power received from the inverter (211) to the receiving coil (231).

[0149] The rectifier circuit (232) can rectify the AC power received by the receiving coil (231) and output the rectified DC power to the DC / DC converter (233).

[0150] The DC / DC converter (233) can convert the size of the DC power rectified in the rectifier circuit (232) and output the converted DC power to the battery (234). The DC / DC converter (233) can adjust the size of the DC power supplied to the battery (234) so ​​as to maintain the output voltage of the battery (234) constant.

[0151] The battery (234) can be charged through direct current power received from the DC / DC converter (233).

[0152] That is, the processor (237) can turn on the operation of the wireless power transmission circuit (210) and the wireless power reception circuit (230) only when the charge amount of the battery (234) is less than or equal to the reference charge amount under standby mode.

[0153] When the processor (237) determines that the charge amount of the battery (234) exceeds the reference charge amount as the battery (234) is charged (S409), the processor (237) can turn off the operation of the wireless power transmission circuit (210) and the wireless power reception circuit (230).

[0154] That is, since only the adapter (32), wireless power transmission circuit (210), and wireless power reception circuit (230) operate when the battery (234) is charged beyond the standard charge amount, power loss can be significantly reduced compared to a design that is always in operation.

[0155] FIG. 5 is a drawing illustrating the configuration of a standby circuit according to one embodiment of the present disclosure.

[0156] The standby circuit (235) may include an LED indicator (235a) and an IR receiving circuit (235b).

[0157] The LED indicator (235a) may be an indicator indicating the power status of the display device (100). The LED indicator (235a) may output a first color indicating the power-off status of the display device (100) or a second color indicating the power-on status of the display device (100).

[0158] The LED indicator (235a) may include one or more LEDs. The processor (237) may determine the color to be output by the LED indicator (235a) depending on the power status.

[0159] The IR receiving circuit (235b) may be a circuit for receiving an IR signal from a remote control device (200). The IR signal may be a signal for turning on or off the power of the display device (100).

[0160] The IR receiving circuit (235b) may include an infrared receiving diode capable of detecting an IR signal and a decoder that decodes the detected IR signal into a digital signal.

[0161] The battery (234) can supply power to the standby circuit (235) under the standby mode of the display device (100). When the charge amount of the battery (234) exceeds a reference charge amount under the standby mode of the display device (100), the processor (237) can discharge the battery (234) to supply power to the standby circuit (235).

[0162] Accordingly, the loss due to power conversion of the adapter (32), the loss due to power conversion of the inverter (211), the loss due to power conversion of the rectifier circuit (232), and the loss due to power conversion of the DC / DC converter (233) can all be reduced.

[0163] That is, the power consumed in the standby mode of the wireless power receiving device (20-3) or the display device (100) is greatly reduced, so that the condition of lower than the standard power required in the standby mode can be satisfied.

[0164] In one embodiment, the processor (237) may control the discharge of the battery (234) so ​​that power is continuously supplied to the standby circuit (235) when the charge amount of the battery (234) exceeds a reference charge amount under the standby mode. The processor (237) may control the discharge of the battery (234) so ​​that power is continuously supplied to the standby circuit (235) until the charge amount of the battery (234) reaches the reference charge amount when the charge amount of the battery (234) exceeds a reference charge amount under the standby mode.

[0165] In another embodiment, the processor (237) may control the discharge of the battery (234) so ​​that power is periodically supplied to the standby circuit (235) when the charge amount of the battery (234) exceeds a reference charge amount under the standby mode. The processor (237) may control the discharge of the battery (234) so ​​that power is periodically supplied to the standby circuit (235) when the charge amount of the battery (234) exceeds a reference charge amount under the standby mode until the charge amount of the battery (234) reaches the reference charge amount.

[0166] When power is supplied periodically to the standby circuit (235) under standby mode, power consumption can be prevented compared to when power is supplied continuously.

[0167] FIG. 6a is a drawing explaining a process of transmitting a power control signal through conventional in-band communication, and FIG. 6b is a drawing explaining a problem that occurs when transmitting a power control signal through in-band communication.

[0168] In-band communication is a communication method in which data and control signals are transmitted through the same medium.

[0169] Referring to Fig. 6a, a conventional wireless power receiving device senses the amount of power received from a wireless power transmitting device. The wireless power receiving device modulates a voltage signal (601) by including a signal representing the sensed amount of power, a signal representing a feedback amount corresponding to the sensed amount of power, or a control signal (603) that controls the operation of the wireless power transmitting device, and transmits a modulated voltage signal (600) to the wireless power transmitting device.

[0170] That is, the conventional wireless power receiving device transmits a modulated voltage signal (600) containing a control signal (603) to the wireless power transmitting device using the ASK (Amplitude Shift Keying) method that modulates the amplitude of the voltage signal.

[0171] However, in this process, a problem occurs in which the wireless power transmission device is turned off due to abnormal operation caused by power noise being superimposed on the modulated voltage signal (630) as shown in Fig. 6b.

[0172] In an embodiment of the present disclosure, instead of in-band communication, a problem of a wireless power transmission device being powered off due to abnormal operation can be prevented by using a BLE circuit.

[0173] A wireless power receiving device (20-3) according to an embodiment of the present disclosure may include a wireless power receiving circuit (230) that wirelessly receives power from a battery (234) and a wireless power transmitting device (20-1), charges the battery (234) with the received power, and a processor (237) that transmits an operation off signal to the wireless power transmitting device (20-1) to turn off the operation of the wireless power transmitting device (20-1) when the power mode of the wireless power receiving device (20-3) is a standby mode and the charge amount of the battery (234) exceeds a reference charge amount.

[0174] The wireless power receiving device (20-3) further includes a standby circuit (235) that waits for reception of a signal for controlling the power state of the wireless power receiving device (20-3), and the processor (237) can supply power to the standby circuit (235) by discharging the battery (234) when the charge amount of the battery (234) exceeds a reference charge amount under the standby mode.

[0175] The processor (237) can turn off the operation of the wireless power receiving circuit (230) when the charge amount of the battery (234) exceeds the reference charge amount under standby mode.

[0176] The wireless power receiving circuit (230) may include a receiving coil (231) that wirelessly receives AC power from a transmitting coil (213) provided in a wireless power transmission device (20-1), a rectifier circuit (232) that rectifies the AC power received through the receiving coil (231) and outputs DC power, and a DC / DC converter (233) that adjusts the size of the DC power output from the rectifier circuit (232). The processor (237) may turn off the operation of the rectifier circuit (232) and the DC / DC converter (233).

[0177] A wireless power transmission device (20-1) may include an inverter (211) that converts direct current power received from an adapter (32) into alternating current power and a transmitting coil (213), and the operation off signal may be a signal for turning off the operation of the inverter (211). The operation off signal may further include a conversion off signal for turning off the conversion function of the adapter (32).

[0178] The wireless power receiving device (20-3) may further include a Bluetooth Low Energy (BLE) circuit (236), and the processor (237) may transmit the operation off signal to the wireless power transmitting device (20-1) through the BLE circuit (236).

[0179] The processor (237) can transmit the operation off signal to the wireless power transmission device (20-1) through the BLE circuit (236) and then turn off the BLE circuit (236).

[0180] When the processor (237) determines that the charge amount of the battery (234) has been discharged below the reference charge amount, it can turn on the BLE circuit (236) and transmit an operation-on signal to the wireless power transmission device (20-1) to turn on the operation of the wireless power transmission device (20-1) through the BLE circuit (236).

[0181] The processor (237) can wirelessly receive power from the wireless power transmission device (20-1) in response to the operation on signal, and charge the battery (234) based on the received power.

[0182] The power mode of the wireless power receiving device (20-3) may include a power on mode in which power is supplied to each of the battery (234) and the standby circuit (235) using power received from the wireless power transmitting device (20-1), and a standby mode in which power is supplied to the standby circuit (235) using power charged in the battery (234).

[0183] The processor (237) can turn on the operation of the wireless power transmission device (20-1) only when it is determined that the charge amount of the battery (234) has been discharged below the reference charge amount.

[0184] The standby circuit (235) may include an LED indicator (235a) that outputs the power status of the wireless power receiving device (20-3) and an IR receiving circuit (235b) that receives an IR signal for controlling the power status of the wireless power receiving device (20-3).

[0185] The display device (100) may include a wireless power receiving device (20-3) and a display (180).

[0186] According to one embodiment of the present invention, the above-described method can be implemented as processor-readable code on a medium in which a program is recorded. Examples of processor-readable media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical data storage devices.

[0187] The display device described above is not limited to the configuration and method of the embodiments described above, and the embodiments may be configured by selectively combining all or part of each embodiment so that various modifications can be made.

Claims

1. In a wireless power receiving device, battery; A wireless power receiving circuit that wirelessly receives power from a wireless power transmission device and charges the battery with the received power; and A processor that transmits an operation off signal to the wireless power transmission device to turn off the operation of the wireless power transmission device when the power mode of the wireless power reception device is a standby mode and the charge amount of the battery exceeds a reference charge amount. Wireless power receiver.

2. In paragraph 1, Further comprising a standby circuit for waiting for reception of a signal for controlling the power state of the wireless power receiving device, The above processor Under the above standby mode, if the charge amount of the battery exceeds the reference charge amount, the battery is discharged to supply power to the standby circuit. Wireless power receiver.

3. In paragraph 2, The above processor When the charge amount of the battery exceeds the reference charge amount under the above standby mode, the operation of the wireless power receiving circuit is turned off. Wireless power receiver.

4. In paragraph 3, The above wireless power receiving circuit A receiving coil that wirelessly receives AC power from a transmitting coil provided in the wireless power transmission device; A rectifier circuit that rectifies AC power received through the receiving coil and outputs DC power; and Includes a DC / DC converter that adjusts the size of the DC power output from the above rectifier circuit, The above processor Turning off the operation of the above rectifier circuit and the DC / DC converter Wireless power receiver.

5. In paragraph 4, The above wireless power transmission device It includes an inverter that converts direct current power received from an adapter into alternating current power and the transmitting coil, The above operation off signal is A signal to turn off the operation of the above inverter Wireless power receiver.

6. In paragraph 5, The above operation off signal is Further comprising a conversion off signal for turning off the conversion function of the above adapter. Wireless power receiver.

7. In paragraph 1, It further includes Bluetooth Low Energy (BLE) circuitry, The above processor Transmitting the operation off signal to the wireless power transmission device through the BLE circuit. Wireless power receiver.

8. In paragraph 7, The above processor After transmitting the operation off signal to the wireless power transmission device through the BLE circuit, the BLE circuit is turned off. Wireless power receiver.

9. In paragraph 8, The above processor When it is determined that the charge amount of the battery is discharged below the reference charge amount, the BLE circuit is turned on, and an operation-on signal for turning on the operation of the wireless power transmission device is transmitted to the wireless power transmission device through the BLE circuit. Wireless power receiver.

10. In paragraph 9, The above processor In response to the above operation on signal, wirelessly receiving power from the wireless power transmission device and charging the battery based on the received power. Wireless power receiver.

11. In paragraph 2, The power mode of the above wireless power receiver is A power-on mode in which power is supplied to each of the battery and the standby circuit using power received from the wireless power transmission device; and Including the standby mode that supplies power to the standby circuit using the power charged in the battery. Wireless power receiver.

12. In paragraph 2, The above processor Periodically supplying power to the above standby circuit Wireless power receiver.

13. In paragraph 1, The above processor The operation of the wireless power transmission device is turned on only when the charge amount of the battery is determined to be discharged below the reference charge amount. Wireless power receiver.

14. In paragraph 2, The above standby circuit An LED indicator outputting the power status of the wireless power receiving device; and An IR receiving circuit comprising an IR receiving circuit for receiving an IR signal for controlling the above power state. Wireless power receiver.

15. The wireless power receiving device described in paragraph 1 and Including a display Display device.

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