Method, apparatus and system for bidirectional wireless charging in wearable devices

Abstract

The present technology provides a wearable device, which includes a main body and an accessory suitable for attachment to the main body. The main body includes a first coil configured to inductively transmit power. The main body may also include a first power management circuit, which is configured to control the first coil to transmit power according to a wireless charging standard, and modulate the power transmitted by the first coil to transmit data according to a wireless communication standard. The accessory may include a second coil configured to inductively receive power. The accessory may also include a second power management circuit, which is configured to control the second coil to receive power transmitted by the first coil according to the wireless charging standard, and control the second pad to receive data transmitted by the first coil according to the wireless communication standard.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the filing date of U.S. Provisional Application No. 62 / 885,891, filed on August 13, 2019, entitled “METHODS, APPARATUS AND SYSTEM FOR BIDIRECTIONAL WIRELESS CHARGING IN WEARABLE DEVICES,” the disclosure of which is incorporated herein by reference. Background Art

[0003] Wearable devices such as smart watches and smart glasses can provide many of the same functions as other personal computing devices. Due to their proximity to the wearer, some wearable devices can provide additional functionality not typically provided by traditional computing devices, such as heart rate and body temperature monitors. In the case of wearable devices with small form factors, implementing such additional functionality can be particularly challenging due to space constraints.

[0004] Wearable devices are typically designed to be portable. For example, they may be configured with accessories that are adapted to be worn by the wearer, such as a strap or a bezel. Such accessories are typically purely mechanical, as including electronic components in an accessory may be difficult in several ways. For example, including electronic components in a smartwatch strap may increase the size and / or weight of the strap, thereby reducing the portability or attractiveness of the smartwatch. Batteries used to power the electronic components may further increase the weight and / or size of the strap. In addition, if an electrical connection, such as a wire or contact pin, is to be provided between the electronic components in the watch body of the smartwatch and the electronic components in the watch strap, and if the watch body and the watch strap can be separated to expose the electrical connection, such electrical connection may limit the waterproofing capability of the smartwatch. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 is a pictorial diagram illustrating an example wearable device according to aspects of the present disclosure.

[0006] Figure 2 is a pictorial diagram illustrating an example wearable device being charged by a charger according to aspects of the present disclosure.

[0007] Figure 3 is a circuit diagram illustrating an example wireless charging and communication system in accordance with aspects of the present disclosure.

[0008] Figure 4A and Figure 4B is an example waveform diagram illustrating frequency modulation and amplitude modulation according to aspects of the present disclosure.

[0009] Figure 4C is an example table of frequency shift keying states according to the Qi standard.

[0010] Figure 5 is a circuit diagram illustrating another example wireless charging and communication system according to aspects of the present disclosure.

[0011] Fig. 6A and Figure 6B is an example waveform diagram illustrating amplitude modulation and load modulation according to aspects of the present disclosure.

[0012] Figure 7 is a circuit diagram illustrating another example wireless charging and communication system according to aspects of the present disclosure.

[0013] Figure 8 is a circuit diagram illustrating another example wireless charging and communication system according to aspects of the present disclosure.

[0014] Fig. 9 is a block diagram of an example system in accordance with aspects of the present disclosure.

[0015] Fig.10 is an example flow chart according to aspects of the present disclosure.

[0016] Fig.11 is another example flow chart according to aspects of the present disclosure. DETAILED DESCRIPTION

[0017] Overview

[0018] The present disclosure provides a wearable device with a wireless charging and communication system. The wireless charging and communication system can achieve two-way wireless communication and / or wireless charging between two components of the wearable device. For example, the wearable device may include: a main body, such as a watch body or a smart glass display; and an accessory suitable for attachment to the main body, such as a watch band or a glass frame. The main body can be a part of the wearable device that includes most of the main electronic components or functionality, and the accessory can be a part of the wearable device that includes the remaining electronic components or functionality. The main body of the wearable device may include a first coil configured to inductively transmit and / or receive power, and the accessory of the wearable device may include a second coil also configured to inductively transmit and / or receive power. For example, power can be transmitted as electromagnetic waves.

[0019] The main body of the wearable device and the accessory of the wearable device may each include a corresponding power management circuit configured to control the corresponding coil to transmit and / or receive power according to a wireless charging standard. For example, the wireless charging standard may be a Qi standard, a near field communication (NFC) standard, or another standard.

[0020] The power management circuits in the body and accessories of the wearable device can also be configured to modulate the transmitted or received power to wirelessly transmit data. For example, the body and accessories of the wearable device can be configured for two-way communication. In this regard, data can be transmitted from the body to the accessory via a first type of modulation, while data can be transmitted from the accessory to the body via a second type of modulation that is different from the first type of modulation. Example types of modulation include amplitude modulation, frequency modulation, load modulation, etc., and combinations thereof. In lieu of or in addition to modulating the transmitted power for data, additional communication modules such as Bluetooth modules can also be used for wireless data transmission.

[0021] The main body and the accessory of the wearable device may each include a controller for controlling power transmission and / or reception. For example, the controller in the main body may determine to charge the accessory only when the wearable device is worn, when the charge in the battery of the main body meets a predetermined threshold, when the main body is not currently being charged, etc. As another example, when the data received from the accessory indicates that the transmitted power does not meet the requirements of the accessory, the controller in the main body may determine not to charge the accessory. Similarly, the controller in the accessory may determine to receive power from the main body only when the wearable device is worn, when the charge in the battery of the accessory is below a predetermined threshold, when the main body is not currently being charged, etc.

[0022] The features described herein are advantageous because they provide bidirectional wireless charging and communication capabilities between the body of the wireless device and the accessories. Wireless charging and communication allow more functionality to be incorporated into the wearable device without adding significant weight or volume, for example by including additional components in the accessories without adding batteries in the accessories, because the accessories can be charged wirelessly. Wireless charging and communication can reduce or eliminate the need for electrical connections between the body of the wearable device and the modular accessories, which can improve waterproof or water resistance. Wireless communication between the body of the wearable device and the accessories can allow intelligent and efficient charging based on various states of the body and / or accessories as described herein. Over-the-air (OTA) software updates can also be performed via wireless communication, which can provide further convenience for the user because the wearable device can be updated while being worn or used. In addition, wireless communication between the body of the wearable device and the modular accessories can provide simple customization and security options by linking the user profile with the radio frequency identification (RFID) in the modular accessories.

[0023] Example System

[0024] Figure 1 An example wearable device is illustrated. In this example, the wearable device is a smart watch 100. However, it should be understood that the wearable device can be any of a variety of wearable devices, such as a pendant, a head-mounted display such as smart glasses, a smart helmet, etc.

[0025] The smartwatch 100 includes a watch body 110. Although the watch body 110 is circular in the illustrated example, the watch body 110 may be any shape, such as rectangular, square, oval, polygonal, arbitrary, etc. The housing of the watch body 110 may be made of a variety of materials, such as metal, plastic, glass, ceramic, or any combination of these or other materials. Figure 1 As shown below, Fig. 9 As described, the watch body 110 may include several electronic and / or mechanical components that may include user input, such as a microphone, a camera, a touch screen; output devices, such as a display, a speaker, a tactile device; one or more processors; a memory; one or more sensors; a wireless charging and communication system; a clock; and the like.

[0026] To wirelessly receive and / or transmit power, the watch body 110 may include one or more charging coils, such as charging coil 120. For example, charging coil 120 may be configured to inductively receive power from a charger. Charging coil 120 may also be configured to supply power to components inside watch body 110, including one or more energy storages, such as batteries. For example, an electrical connection may be provided between charging coil 120 and components inside watch body 110. Charging coil 120 may also be configured to inductively supply power to other components of smart watch 100, such as components in or on accessories of smart watch 100.

[0027] Smart watch 100 may include one or more accessories, such as modular strap 130. In other examples where the wearable device is a different device, the body of the device may be glasses or a pendant, which may be integrally formed or adapted to be modularly attached to an accessory, such as a glasses frame or a necklace. Strap 130 may be made of a variety of materials such as metal, rubber, nylon, cotton, plastic, glass, ceramic, or any combination of these or other materials. Strap 130 may be adapted to be worn on a person's wrist. For example, as shown, strap 130 includes strap 140. Strap 140 may be adjusted to provide a secure and comfortable fit around the wearer's wrist. In other examples, the strap may be a bracelet, such as for a looser fit, or another type of attachment mechanism.

[0028] The strap 130 may also include a container 150 suitable for fastening the watch body 110 of the smart watch 100 to the strap 130. For example, in order to accommodate the watch body 110, the container 150 may have a shape similar to the watch body 110. In addition, the container 150 may include features such as grooves, hooks, locks, screws, pins, magnets, etc., which may interlock with features of the watch body 110 to ensure a secure attachment. Although the container 150 is shown in this example, in other examples, the strap 130 may include other mechanical features that directly fasten the strap 130 to the watch body 110, such as pins, screws, hooks, locks, etc.

[0029] In order to reduce the form factor of the smart watch 100, and / or include additional components without increasing the form factor of the watch body 110, the strap 130 can be configured to contain electronic and / or mechanical components. For example, the electronic components 160 are shown to be positioned within the band 140. Alternatively or in addition, these electronic components can be positioned within the container 150. The electronic components 160 may include a wireless communication system for transmitting and / or receiving data 110 from components in the watch body 110 and / or to and from other devices. In some examples, the electronic components 160 provided in the strap 130 may be components that operate better in a case closer to the wearer's skin, such as heart rate or body temperature sensors, IR or capacitive sensors for detecting whether the smart watch 100 is worn, tactile feedback, etc. The electronic components 160 may also include an identification and / or authentication device that can be linked to a user profile or account, such as a radio frequency identification (RFID) device. For example, a user profile or account may include information such as user preferences and other user data.

[0030] The strap 130 may also include a charging coil 170 for wirelessly receiving and / or supplying power. For example, the charging coil 170 may be configured to inductively receive power from a charger. The charging coil 170 may also be configured to inductively receive power from the watch body 110 of the smart watch 100, such as via the charging coil 120. In order to ensure alignment between the charging coil 120 and the charging coil 170, the charging coil 170 may be positioned in the container 150 of the strap 130 so that when the watch body 110 is fastened in the container 150, the two charging coils 120 and 170 are aligned with each other. The charging coil 170 of the strap 130 may be configured to supply power to the electronic component 160. At this point, the strap 130 may include an electrical connection 180 connecting the charging coil 170 to the electronic component 160.

[0031] In some examples, the strap 130 may include one or more energy storage units, such as one or more batteries. To this end, the battery can supply power to the electronic components 160 even when the strap 130 is not charged by the charger or the watch body 110. In other examples, to avoid making the strap 130 bulky or cumbersome to the wearer, or in the case where the electronic components 160 can function without being attached to the watch body 110, the strap 130 may not include an energy storage unit. For example, the electronic components 160 may include heart rate and body temperature sensors that are only intended to function when worn with the watch body 110, which can analyze and display information based on data from these sensors.

[0032] Because the watch body 110 and the watch band 130 are modular, the smart watch 100 can be customized by replacing the watch band 130 with another watch band. For example, another watch band may include a different set of electronic components than the electronic components 160 of the watch band 130. Therefore, the functionality of the smart watch 100 can be changed without changing the components of the watch body 110. In addition, in the case where the watch band includes an identification and / or authentication device such as an RFID device, the smart watch 100 can be customized based on preferences in a user profile linked to the RFID. In addition, the identification and / or authentication features can provide improved data security, such as by only allowing the watch body 110 to access the user data of the user associated with the RFID in the watch band 130.

[0033] In addition, the wireless charging and communication capabilities can improve the waterproof or water-resistant characteristics of the smart watch 100. For example, because both the watch body 110 and the strap 130 can include wireless charging and / or communication capabilities, an electrical connection such as a wire or a contact pin may not be required between the watch body 110 and the strap 130. To this end, even if the watch body 110 is separated from the strap 130, the electronic components and the charging coil 120 of the watch body 110 and the electronic components 160 and the charging coil 170 of the strap 130 may not be exposed to contaminants such as dirt or water through the exposed wires or contact pins. For example, the electronic components and the charging coil 120 of the watch body 110 can be completely enclosed in the housing of the watch body 110, and the electronic components 160 and the charging coil 170 of the strap 130 can be completely enclosed in the material of the container 150 or the band 140.

[0034] Figure 2 An example wearable device being charged by a charger is shown. In this example, the wearable device is Figure 1The smartwatch 100 is a wireless charger 200. The charger 200 may be configured to transfer power by induction, such as by a charging coil 210. For example, to charge, a device having a charging coil, such as a smartwatch 100, may be positioned on a surface 220 of the charger 200 so that the charging coil 120 is aligned with the charging coil 210. The charger 200 itself may include a connection to a power source, such as a cable 230 for connecting to a power outlet.

[0035] The charger 200 can charge the smart watch 100 in any of several ways. For example, the charger 200 can inductively transfer power to the charging coil 120 of the watch body 110 via the charging coil 210, which in turn can inductively transfer power to the charging coil 170 of the strap 130 when the strap 130 is attached to the watch body 110. In some instances, the watch body 110 can be configured to charge the strap 130 only when the smart watch 100 is worn. This may be the case if the strap 130 does not include a battery, because without energy storage, it may be wasteful to charge the strap 130 when it is not worn. In instances where the strap 130 does include a battery, the charger 200 can inductively transfer power to both the charging coil 120 of the watch body 110 and the charging coil 170 of the strap 130 via the charging coil 210 simultaneously. Alternatively, charger 200 may inductively transfer power via charging coil 210 to charging coil 170 of watch band 130 , which in turn transfers power to charging coil 120 of watch body 110 .

[0036] Figure 3 Shown for use such as Figure 1 An example wireless charging and communication system 300 for a wearable device of a smart watch 100 is shown. The system 300 includes components from the body and accessories of the wearable device. For example, the system 300 illustrates various components in the watch body 110 and various components in the watch band 130. In this example, the system 300 is configured to wirelessly transmit / receive power and communicate according to the Qi standard.

[0037] As shown, the watch body 110 includes a power management circuit 310 configured to enable wireless power transmission to the watch band 130. For example, the power management circuit 310 may be an integrated circuit chip, such as a power management integrated circuit (PMIC). The power management circuit 310 may be configured to provide a certain voltage (V in) receives incoming power from an energy source such as a battery or a connection to an electrical outlet in the watch body 110. For example, the power management circuit 310 can receive DC current from a battery in the watch body 110 and convert the DC current into alternating current (AC) with an alternating electromagnetic field based on the Qi standard, thereby generating power 330. The power 330 can then be transmitted to the strap 130 as an alternating electromagnetic field by the coil 120 (indicated by the thick arrow) of the watch body 110.

[0038] In addition, as shown in the figure, the strap 130 also includes a power management circuit 360, which is configured to enable wireless power transmission from the watch body 110. In this regard, the power management circuit 360 can also be an integrated circuit chip, such as a PMIC. For example, the charging coil 170 of the strap 130 can receive the transmitted power 330 in the form of an alternating electromagnetic field from the charging coil 120 of the watch body 110, and the charging coil 170 can also transmit the received power to the power management circuit 360. For example, the power management circuit 360 can convert the received power 330 in the form of an alternating electromagnetic field into a DC current having a certain voltage (V out ). In some examples, the power management circuit 360 may also determine whether the transmitted power 330 meets the requirements of the strap 130. For example, the power management circuit 360 may compare the voltage of the transmitted power 330 with a threshold voltage and determine whether the voltage of the transmitted power 330 is within a predetermined range of the threshold voltage.

[0039] To control various aspects of power transmission, the watch body 110 and the strap 130 of the smart watch 100 may each include one or more controllers, such as the controller 320 and the controller 370, respectively. The controller 320 may be configured to communicate with the power management circuit 310 and with the controller 370 to manage power transmission. For example, the controller 320 may determine whether to initiate or stop power transmission to the strap 130 based on any of several parameters such as the energy state of the watch body 110 and / or the strap 130, whether the watch body 110 and / or the strap 130 is currently being charged, whether the power 330 transmitted by the watch body 110 meets the requirements of the strap 130, such as a threshold voltage, etc. Similarly, the controller 370 may be configured to communicate with the power management circuit 360 and with the controller 320 to manage power reception. For example, the controller 370 can also determine whether to accept power transmission based on any one of several parameters such as the energy status of the watch body 110 and / or the strap 130, whether the watch body 110 and / or the strap 130 is currently being charged, whether the transmitted power 330 received from the watch body 110 meets the requirements of the strap 130 - such as, a threshold voltage, etc.

[0040] Controllers 320 and 370 may each be configured to wirelessly transmit data to each other and / or receive data from each other to provide other functionality. For example, upon receiving a software update, controller 320 may be configured to wirelessly transmit data related to the software update to update the software of controller 370. This allows over-the-air (OTA) updates to be performed while smart watch 100 is being worn and used by a user, without requiring the user to set up smart watch 100 to be released just to install the software update. As another example, controller 320 may wirelessly send a signal to controller 370 to instruct the electronic component 160 of strap 130 to generate an output, such as a tactile effect. Controller 320 may also wirelessly receive data from controller 370, such as sensor data measured by electronic component 160, which may include heart rate, body temperature, light / capacitance measurements indicating that strap 130 is being worn, and the like. In this regard, as shown, controller 370 may be configured to communicate with electronic component 160, and controller 320 may be configured to communicate with the electronic component of watch body 110.

[0041] In this regard, the power management circuit 310 may be configured to modulate the transmitted power to enable wireless communication between the watch body 110 and the strap 130, such as from the controller 320 of the watch body 110 to the controller 370 of the strap 130. For example, the power management circuit 310 may be configured to adjust the frequency of the alternating magnetic field of the power 330 transmitted at the coil 120 to send data to the strap 130. The modulation may produce a frequency modulated signal according to the Qi communication standard. This may be achieved by an LC circuit or a tank circuit, such as by adjusting the equivalent capacitance of the circuit. For example, as shown, the LC circuit may be formed by the charging coil 120 to provide inductance, and by the capacitor 340 to provide capacitance. The power 330, which is now modulated to carry data, may then be transmitted to the coil 170 of the strap 130 via the coil 120.

[0042] Similarly, on the side of the strap 130, the power management circuit 360 can be configured to modulate the received power to enable communication between the strap 130 and the watch body 110, such as from the controller 370 of the strap 130 to the controller 320 of the watch body 110. For example, the power management circuit 360 can be configured to adjust the amplitude of the alternating magnetic field of the transmitted power 330 received by the coil 170 to send data to the watch body 110. The modulation can produce an amplitude-modulated signal according to the Qi communication standard. This can be achieved by an LC circuit or a tank circuit, such as by adjusting the equivalent capacitance of the circuit. For example, as shown, the LC circuit can be formed by the charging coil 170 to provide inductance, and by capacitors 390 and 392 to provide capacitance. The power 330, which is now modulated to carry data, can then be transmitted to the coil 170 of the strap 130 via the coil 120. The charging coil 170 and the capacitor 390 can form a main LC tank circuit for power transfer, wherein the capacitor 390 can remove the DC component from the received power 330. The equivalent capacitance of capacitor 392 can be adjusted to produce an amplitude adjusted signal. The power 330, now modulated to carry data, can then allow data to be transferred from the strap 130 to the watch body 110.

[0043] To this end, the transmitted power 330 may carry data to be transmitted in both directions, namely, from the watch body 110 to the watch strap 130, and from the watch strap 130 to the watch body 110. To avoid any conflicts in this bidirectional data transmission, the transmitted power 330 may be modulated by either the watch body 110 or the watch strap 130, but not both, at any given time. The watch body 110 and the watch strap 130 may take turns transmitting data to each other according to any suitable type of schedule.

[0044] Figure 4A and Figure 4B Examples of frequency modulation and amplitude modulation are illustrated separately. Figure 4Aand Figure 4B Aspects of the drawings may not be drawn to scale. Figure 4A Modulation by frequency shift keying (FSK) is illustrated. For example, the controller 320 of the watch body 110 of the smart watch 100 may have data 410 to be transmitted to the strap 130. The data 410 from the controller 320 may have a waveform, such as a square waveform as shown, in which a high signal is assigned a logic "1" and a low signal is assigned a "0". The data 410 may be transmitted by modulating another signal. For example, the signal may be the power 330 transmitted by the charging coil 120, and the gas may be an AC signal with a specific frequency "f0". In order to transmit the data 410, the power signal 330 may be modulated by changing its frequency. For example, when a high signal in the data 410 is to be transmitted, the power signal 330 may be modulated with a first frequency "f1", and when a low signal in the data 410 is to be transmitted, the power signal may be modulated with a second frequency "f2", resulting in a modulated signal 430. In addition, as shown in the modulated signal 430, in this example, the first frequency f1 may be higher than the second frequency f2.

[0045] For the convenience and clarity of explanation, Figure 4A shows a relatively large difference between fl and f2. However, according to the Qi standard, the difference between f1 and f2 may be much smaller. For example, Figure 4C A table 470 is shown with example frequency differences for FSK according to the Qi standard. Referring to the table, the frequency used for FSK can be adjusted between a smaller modulation depth (smaller frequency difference) and a larger modulation depth (larger frequency difference). In addition, the frequency used for FSK can have a negative or positive polarity depending on whether the higher frequency is keyed for a high signal or a low signal. For example, if the modulation depth is negative 3 ... Figure 4A For the modulated power signal 430 in , the frequencies may be f1=fop=145kHz and f2=fmod=139kHz, respectively, with a difference of 6kHz.

[0046] Figure 4BModulation by amplitude shift keying (ASK) is illustrated. For example, the controller 370 of the strap 130 of the smart watch 100 may have data 440 to be transmitted to the watch body 110. The data 440 from the controller 370 may also have a waveform such as a square waveform. The data 440 may be transmitted by modulating another signal, such as the power 330 received by the charging coil 170, which may be an AC signal with a specific amplitude "A0". In order to transmit the data 440, the power signal 330 may be modulated by changing its amplitude. For example, when a high signal in the data 440 is to be transmitted, the power signal 330 may be modulated with a first amplitude "A1", and when a low signal in the data 440 is to be transmitted, the power signal may be modulated with a second amplitude "A2", resulting in a modulated signal 460. In addition, as shown in the modulated signal 460, in this example, the first amplitude A1 may be higher than the second amplitude A2.

[0047] As with FSK, the amplitude used for ASK according to the Qi standard can also be adjusted between small depth (small difference) and large depth (large difference). The amplitude used for ASK can also have negative or positive polarity depending on whether the higher amplitude is keyed for high or low signals.

[0048] therefore, Figure 4A and Figure 4B An example of implementing bidirectional wireless communication between a watch body 110 and a watch band 130 is illustrated. By modulating the same power 330, data can be sent from a controller 320 to a controller 370, and from a controller 370 to a controller 320. This is achieved by using two different types of modulation for data transmitted in different directions. By using the same transmitted power and the same wireless standard for both charging and communication, the number of components can be reduced. For example, a PMIC configured for Qi can be included in each of the watch body 110 and the watch band 130 without the need for an additional PMIC or communication module. Although in this example according to the Qi standard, FSK is used for data transmitted from the watch body 110 to the watch band 130, and ASK is used for data transmitted from the watch band 130 to the watch body 110, in other examples according to other standards, ASK can be used for data transmitted from the watch body 110 to the watch band 130, and FSK can be used for data transmitted from the watch band 130 to the watch body 110. In yet other examples, other types of modulation may be used alternatively or additionally.

[0049] Figure 5 Shown for use such as Figure 1 Another example of a wireless charging and communication system 500 for a wearable device of a smart watch 100. The system 500 includes many Figure 3Similar features are shown in Figure 5 and are labeled as such. For example, system 500 also includes components for watch body 110 and watch band 130, charging coil 120 and charging coil 170, and electronic component 160. The differences between system 300 and system 500 are described herein. For example, while power management circuits 510, 560 and controllers 520, 570 may be configured similarly to power management circuits 310, 360 and controllers 320, 370, respectively, here power management circuits 510, 560 and controllers 520, 570 may be configured to wirelessly transfer power and communicate according to the NFC standard.

[0050] The power 530 transmitted according to the NFC standard may have different characteristics than the power 330 transmitted according to the Qi standard. For example, the voltage and / or current of the power transmitted according to the NFC standard may be lower than the voltage and / or current of the power transmitted according to the Qi standard. For example, the amplitude of the power transmitted according to the NFC standard may be typically 0.5W to 1W, while the amplitude of the power transmitted according to the Qi standard may be typically 5W to 15W. As another example, the frequency of the power transmitted according to the NFC standard may be typically 13.56MHz), while the frequency of the power transmitted according to the Qi standard may be typically 87kHz-205kHz.

[0051] In addition, compared to the Qi standard, the power 530 can also be modulated in a different manner according to the NFC standard in order to transmit data. For example, the power management circuit 510 can be configured to adjust the amplitude of the alternating electromagnetic field of the power 530 transmitted through the coil 120 to send data to the strap 130. The modulation can produce an amplitude-modulated signal according to the NFC communication standard. This can be achieved by an LC circuit or a tank circuit. For example, as shown in the figure, an LC circuit can be formed by the charging coil 120 to provide inductance, and by the capacitor 540 to provide capacitance. In addition, as shown in this example, the capacitor is in a parallel configuration. The power 330, which is now modulated to carry data, can then be transmitted to the coil 170 of the strap 130 via the coil 120.

[0052] Similarly, on the side of the strap 130, the power management circuit 560 can be configured to modulate the received power to enable communication between the strap 130 and the watch body 110, such as from the controller 570 of the strap 130 to the controller 520 of the watch body 110. For example, the power management circuit 560 can be configured to adjust the load of the alternating electromagnetic field of the power 530 received by the coil 170 to send data to the watch body 110. The modulation can generate a load-modulated signal according to the NFC communication standard. The modulation can generate an additional load at a different frequency, adding the additional load to the power 530 according to the NFC communication standard. This can be achieved by an LC circuit or a tank circuit. For example, as shown, a diode 594 and a capacitor 592 can form a peak detection circuit for AC to DC conversion, and also for determining the amplitude of the modulated signal received from the watch body 110, so as to decode the data carried by the modulated signal. Resistor 596 and switch 598 can be used to transmit data from strap 130 to watch body 110, where switch 598 can be switched at a carrier frequency (e.g., a frequency lower than the switching frequency of NFC at 13.56 MHz, such as 423 kHz). This load change can be detected by power management circuit 510 on watch body 110, for example, through charging coil 120 and capacitor 540.

[0053] Fig. 6A and Figure 6B Examples of amplitude modulation and load modulation are illustrated respectively. Fig. 6A and Figure 6B Aspects of the drawings may not be drawn to scale. Fig. 6A and Figure 6B Another example way of implementing bidirectional communication between the watch body 110 and the strap 130 is illustrated. By modulating the same power signal 530, data can be sent from the controller 520 to the controller 570, and also from the controller 570 to the controller 520. However, in this example according to the NFC standard, ASK is used for data transmitted from the watch body 110 to the strap 130, and load modulation is used for data transmitted from the strap 130 to the watch body 110. In other examples according to other standards, load modulation may be used for data transmitted from the watch body 110 to the strap 130, and ASK may be used for data transmitted from the strap 130 to the watch body 110. In other examples, other types of modulation may be used alternatively or additionally.

[0054] Fig. 6A illustrates ASK modulation, which is shown as Figure 4BFor example, data 610 may be transmitted by modulating the amplitude A0' of power signal 530, thereby generating a modulated signal with an amplitude of A3 when a high signal is transmitted in data 610, and generating a modulated signal with an amplitude of A4 when a low signal is transmitted in data 610. However, in this example, data 610 is an amplitude modulated signal transmitted from watch body 110 to watch band 130.

[0055] Figure 6B Load modulation is illustrated, and as shown, load modulation is different from both ASK and FSK described above. For example, in order to transmit data 640 from the controller 570 of the strap 130 to the watch body 110, the power signal 530 can be modulated, and the power signal 530 may have a specific frequency f0' and a specific amplitude A0'. The power signal 530 can be modulated by adding a load signal, and when a high signal is to be transmitted in the data 640, the load signal has a load frequency f3 different from the frequency f0' of the transmitted power and a first load amplitude A5, and when a low signal is to be transmitted in the data 640, the load signal has a second amplitude A6. In addition, as shown by the modulated power signal 660, the load frequency f3 (e.g., 13.45MHz) can be higher than the frequency f0' (e.g., 423kHz). A5 and A6 can be the same as or different from A3 and A4, respectively.

[0056] Although Figure 3 and Figure 5 The examples in use one standard for both wireless power transmission and wireless data transmission, but in other examples, different standards may be used for wireless power transmission and wireless data transmission. For example, wireless power transmission may use a protocol that allows higher levels of power to be transmitted, while wireless data transmission may use a protocol that allows larger amounts of data to be transmitted. For example, the Qi standard and the NFC standard may allow a higher amount of power to be transmitted than the Bluetooth standard, which may be on the order of hundreds of milliwatts, while the Bluetooth standard may transmit up to tens of mW. On the other hand, the Bluetooth standard may allow a higher amount of data to be transmitted, such as on the order of megabits per second, compared to the Qi standard and the NFC standard, which may be on the order of hundreds of bits per second. To this end, a combination of two or more standards may be used to design wireless charging and communication systems to improve the efficiency of power and / or data transfer. Figure 7 and Figure 8 Each illustrates an example system in which two types of signals are used for wireless power transmission and wireless data transmission.

[0057] For example, Figure 7 Shown for use such as Figure 1 An example wireless charging and communication system 700 for a wearable device of a smart watch 100 is shown. The system 700 includes many components related to Figure 3Similar features are also described herein and are labeled as such. For example, system 700 also includes components for watch body 110 and watch band 130, charging coil 120 and charging coil 170, electronic components 160, and power management circuits 310, 360 configured to transfer power using the Qi standard. The differences between system 300 and system 700 are described herein.

[0058] For example, although controllers 720, 770 can be configured similarly to controllers 320, 370, respectively, controllers 720, 770 can be configured to communicate using the Bluetooth standard. Power 730 can still be transmitted from the table body 110 and the watch band 130, however, the power 730 is not modulated to transmit data. On the contrary, data 750 is transmitted between the Bluetooth communication module 710 in the table body 110 and the Bluetooth communication module 740 in the watch band 130. As an example, the Bluetooth communication modules 710 and 740 can each be a Bluetooth chipset. In addition, as shown in the figure, the Bluetooth communication modules 710 and 740 can be configured for two-way communication.

[0059] Figure 8 Shown for use such as Figure 1 Another example of a wireless charging and communication system 800 for a wearable device of a smart watch 100. The system 800 includes many Figure 5 For example, system 800 also includes components for watch body 110 and watch band 130, charging coil 120 and charging coil 170, electronic components 160, and power management circuits 510, 560 configured to transfer power using the NFC standard. However, while controllers 820, 870 may be configured similarly to controllers 520, 570, respectively, controllers 820, 870 may be configured to communicate using the Bluetooth standard to communicate with the NFC standard. Figure 7 For example, power 830 may be transmitted from the watch body 110 and the watch band 130 without modulation, and data 850 may be transmitted between the Bluetooth communication module 810 in the watch body 110 and the Bluetooth communication module 840 in the watch band 130. In addition, as shown, the Bluetooth communication modules 810 and 840 may be configured for two-way communication.

[0060] Although Figure 7 and Figure 8 Each illustrates an example system in which Bluetooth signals are used for wireless data transmission and another standard is used for wireless power transmission, but other combinations are possible. For example, the Qi standard can be used for wireless power transmission and the NFC standard can be used for wireless data transmission, and vice versa. In addition, although Figure 3 , Figure 5 , Figure 7 and Figure 8The examples in illustrate wireless power transmission and wireless data transmission using the Qi standard, the NFC standard, or the Bluetooth standard, but in other examples, wireless power transmission and wireless data transmission may be performed using different standards such as the Airfuel-A4WP protocol.

[0061] Fig. 9 1 is a functional block diagram of a wearable device in which the features described herein may be implemented. For example, the wearable device may be a smartwatch 100 including a watch body 110 and a watch band 130. It should not be viewed as limiting the scope of the present disclosure or the usefulness of the features described herein. For example, as shown, the watch body 110 may include one or more processors 112, a memory 114, and other components typically found in a general-purpose computing device, and the watch band 130 may similarly include one or more processors 132, a memory 134, and other components typically found in a general-purpose computing device.

[0062] The memory 114, 134 may store information accessible by the one or more processors 112, 132, including instructions 116, 136 executable by the one or more processors 112, 132. The memory 114, 134 may also include data 118, 138 that may be retrieved, manipulated, or stored by the processors 112, 132. The memory may be of any non-transitory type capable of storing information accessible by a processor, such as a hard drive, memory card, ROM, RAM, DVD, CD-ROM, writable and read-only memory.

[0063] The instructions 116, 136 may be any set of instructions directly executed by one or more processors, such as machine code, or any set of instructions indirectly executed, such as a script. In this regard, the terms "instructions," "applications," "steps," and "programs" may be used interchangeably herein. The instructions may be stored in an object code format for direct processing by a processor, or in any other computing device language including a collection of scripts or independent source code modules that are interpreted or precompiled as needed. The functions, methods, and routines of the instructions are explained in more detail below.

[0064] Data 118, 138 may be retrieved, stored, or modified by one or more processors 112, 132 in accordance with instructions 116, 136. For example, although the subject matter described herein is not limited to any particular data structure, the data may be stored in a computer register, in a relational database as a table or XML document having many different fields and records. The data may also be formatted in any computing device readable format, such as, but not limited to, binary values, ASCII, or Unicode. In addition, the data may include any information sufficient to identify the relevant information, such as numbers, descriptive text, proprietary codes, indicators, references to data stored in other storage such as other network locations, or information used by a function to calculate related data.

[0065] The one or more processors 112, 132 may be any conventional processor, such as a commercially available CPU. Alternatively, the processor may be a dedicated component, such as an application specific integrated circuit ("ASIC") or other hardware-based processor. Although not required, the watch body 110 and / or the watch band 130 may include dedicated hardware components to perform specific computing processes more quickly or more efficiently, such as decoding video, matching video frames to images, warping video, encoding warped video, etc. As an example, the one or more processors 112 may include Figure 3 Controller 320, Figure 5 Controller 520, Figure 7 Controller 720 or Figure 8 Similarly, one or more processors 132 may include Figure 3 Controller 370, Figure 5 Controller 570, Figure 7 Controller 770 or Figure 8 Controller 870.

[0066] Although Fig. 9 The processors, memory, and other elements of the watch body 110 and the watch band 130 are illustrated as being functionally within the same block, but the processor, computer, computing device, or memory may actually include multiple processors, computers, computing devices, or memories that may or may not be stored within the same physical housing. For example, the memory may be a hard drive or other storage medium located in a housing different from the watch body 110 and / or the watch band 130. Therefore, references to a processor, computer, computing device, or memory will be understood to include references to a collection of processors, computers, computing devices, or memories that may or may not operate in parallel.

[0067] In addition, if Fig. 9As shown in , the watch body 110 and the watch band 130 can include one or more user inputs, such as user inputs 111, 131, respectively. For example, the user inputs can include mechanical actuators, soft actuators, peripheral devices, sensors, and / or other components. The user may be able to use the user inputs 111, 131 to interact with the smart watch 100, such as opening a web page or email, writing a message, controlling display or audio functionality, controlling sensors to monitor heart rate or body temperature, positioning via GPS, and the like.

[0068] The watch body 110 and the watch band 130 may include one or more output devices, such as output devices 113, 133, respectively. For example, the output device may include one or more speakers, transducers or other audio outputs, user displays, tactile interfaces, or other tactile feedback that provide non-visible and non-audible information to the user. For example, the display in the output device 113, 133 can display visual information such as text, graphics, video, etc. to the user. As another example, the speaker in the output device 113, 133 can be used to play music, transmit audio for navigation or other guidance for multimedia files, voice calls, translated voice, etc. In addition, the tactile or tactile feedback in the output device 113, 133 can be used to generate non-visible and non-audible alarms, such as by vibration. In some instances, the tactile or tactile feedback may be included in the output device 133 of the watch band 130, which, when worn, can be in closer contact with the user than the watch body 110, and may therefore be more effective.

[0069] The watch body 110 and the watch band 130 may include one or more sensors, such as sensors 115 and 135, respectively. For example, the sensor may include a visual sensor, an audio sensor, a touch sensor, and the like. The sensor may also include a motion sensor, such as an inertial measurement unit ("IMU"). According to some examples, the IMU may include: an accelerometer, such as a 3-axis accelerometer; and a gyroscope, such as a 3-axis gyroscope. The sensor may also include a barometer, a vibration sensor, a thermal sensor, a radio frequency (RF) sensor, a magnetometer, an air pressure sensor, a heart rate sensor, and a body temperature sensor. Additional or different sensors may also be used. In some instances, a sensor that measures the user's physiological state, such as a heart rate sensor or a body temperature sensor, may be included in the sensor 135 of the watch band 130, which, when worn, may be in closer contact with the user than the watch body 110, and may therefore generate more accurate measurements. As another example, a sensor that detects whether the smart watch 100 is worn, such as an IR or capacitive sensor, may also be included in the sensor 135 of the strap 130 , which may also generate more accurate detection due to its proximity to the user.

[0070] In order to obtain information from each other and send information to each other and to other remote devices, the watch body 110 and the watch band 130 can each include a communication system. The communication system can be part of the charging and communication system 117, 137, respectively. At this point, the charging and communication system 117, 137 can each include a wireless charging and communication system 300, 500, 700 or 800. In the example shown, the charging and communication system 117, 137 includes: a wireless charging and communication system 300, which has a power management circuit 310, 360 configured to modulate a power signal to transmit data; and a controller 320, 370, which controls the transmission and / or reception of data based on the Qi standard. Although shown as being separate, the controllers 320, 370 can be part of the processors 112, 132, respectively. In other examples, the charging and communication systems 117, 137 may alternatively include: a power management circuit 510, 560 and a controller 520, 570 configured to transmit and / or receive data according to the NFC standard; or alternatively a controller 720, 770 and a Bluetooth communication module 710, 740, which are configured to transmit and / or receive data according to the Bluetooth standard, etc.

[0071] Using the communication system, the watch body 110 and the watch band 130 can communicate with each other and / or with other devices (not shown). The communication system can implement a wireless network connection, a wireless ad hoc connection, and / or a wired connection. Via the communication system, the watch body 110 and the watch band 130 can establish a communication link, such as a wireless link. The communication system can be configured to support communication via cellular, LTE, 4G, WiFi, GPS, and other networking architectures. The communication system can be configured to support Bluetooth LE, Near Field Communication (NFC) standards, Qi standards, and non-networked wireless arrangements. The communication system may support wired connections such as USB, micro-USB, USB Type-C, or other connectors, for example to receive data and / or power from a laptop, tablet, smartphone, or other device.

[0072] In order to receive and / or transmit power, the watch body 110 and the watch band 130 can each include a charging system. The charging system can be part of the charging and communication system 117, 137, respectively. At this point, the charging and communication system 117, 137 can each include a wireless charging and communication system 300, 500, 700 or 800. The charging and communication system 117, 137 can each include one or more energy storages, such as energy storage 119, 139. In the example shown, the charging and communication system 117, 137 includes: a wireless charging and communication system 300, which has a power management circuit 310, 360 configured to inductively transmit and / or receive power; and a controller 320, 370, which controls transmission and / or reception based on the Qi standard and other parameters such as battery or charging status. Although shown as separate, the controllers 320, 370 can be part of the processors 112, 132, respectively. In other examples, the charging and communication systems 117 , 137 may instead include power management circuits 510 , 560 and controllers 520 , 570 configured to transmit and / or receive power according to the NFC standard, or the like.

[0073] Although not shown, the watch body 110 and / or the watch band 130 may also include other additional components. For example, the watch body 110 and / or the watch band 130 may include a location determination module, which may include a GPS chipset or other positioning system components. Information from sensors and / or information from data received or determined from a remote device (e.g., a wireless base station or a wireless access point) may be used by the location determination module to calculate or otherwise estimate the physical location of the watch body 110 and / or the watch band 130. As another example, the watch body 110 and / or the watch band 130 may each include one or more internal clocks. The internal clock may provide timing information that can be used for time measurement of applications and other programs run by a computing device, as well as basic operations of computing devices, sensors, input / output, GPS, communication systems, etc.

[0074] Example Method

[0075] In addition to the above example systems, example methods are now described. Such methods may be performed using any of the above systems, modifications thereof, or a variety of systems with different configurations. It should be understood that the operations involved in the following methods need not be performed in the exact order described. Instead, various operations may be handled in a different order or simultaneously, and operations may be added or omitted.

[0076] Fig.10An example flow chart that can be executed by a wearable device such as smart watch 100 is shown. In particular, the flow chart can be executed by a body of a wearable device such as watch body 110 of smart watch 100. For example, components of the wireless charging and communication system 300 or 500 in the watch body 110 such as one or more processors in the controller 320 or 520 can be configured to execute Fig.10 Flowchart of the process.

[0077] See also Fig.10 In block 1010, the coil in the body of the wearable device may be controlled by one or more processors to transfer power according to a wireless charging standard. For example, the controller 320 or 520 may control the power management circuit 310 or 510, respectively, which in turn may control the coil 120 to transfer power according to the wireless charging standard. Figure 3 The Qi standard shown in Figure 5 The NFC standard shown in FIG. 1 transmits power.

[0078] In block 1020, power transmitted through the coil in the body is modulated by one or more processors to transmit data according to a wireless communication standard. For example, controller 320 or 520 may control power management circuit 310 or 510, respectively, which in turn may modulate power transmitted through coil 120 to transmit data according to a wireless communication standard. Figure 3 The Qi standard shown in Figure 5 As described above with respect to the example system, the data may include the energy state of the watch body 110, the charging state of the watch body 110, instructions for the electronic components 160 in the strap 130, and the like.

[0079] In block 1030, the coil in the body is controlled by one or more processors to receive data from the coil in the accessory of the wearable device according to the wireless communication standard. For example, the controller 320 or 520 may control the power management circuit 310 or 510, respectively, which in turn may control the coil 120 to receive data according to the wireless communication standard. Figure 3 The Qi standard shown in Figure 5 As described above with respect to the example system, the data may include the energy state of the strap 130, the charging state of the strap 130, sensor data measured by the electronic components 160 in the strap 130 - such as heart rate, body temperature, IR / capacitive sensor data, identification / authentication information from an RFID device in the strap 130, etc.

[0080] In block 1040, power transmission through the coil in the main body is controlled based on data received through the coil in the accessory. For example, the controller 320 or 520 may determine to charge the strap 130 only when the data received from the strap 130 indicates that the smart watch 100 is being worn, thereby avoiding wasteful charging of the strap 130 when not in use. As another example, when the data received from the strap 130 indicates that the battery of the strap 130 has a charge that satisfies a predetermined threshold, the controller 320 or 520 may determine not to charge the strap 130, thereby avoiding wasteful charging of the strap 130 when not needed. As yet another example, the controller 320 or 520 may determine not to charge the strap 130 when data such as an error message received from the strap 130 indicates that the power transmitted does not meet the requirements of the strap 130, such as, not meeting the threshold voltage.

[0081] Fig.11 Another example flow chart that can be executed by a wearable device such as smart watch 100 is shown. In particular, the flow chart can be executed by an accessory of a wearable device such as a strap 130 of smart watch 100. For example, the components of the wireless charging and communication system 300 or 500 in the strap 130 can be based on Fig.11 Flowchart of a method for wirelessly receiving and / or transmitting power and data.

[0082] See also Fig.11 In block 1110, the coil in the accessory of the wearable device may be controlled by one or more processors to receive power according to the wireless charging standard. For example, the controller 370 or 570 may control the power management circuit 360 or 560, respectively, which in turn may control the coil 170 to receive power according to the wireless charging standard. Figure 3 The Qi standard shown in Figure 5 The NFC standard shown in FIG. 1 receives power.

[0083] In block 1120, power received via a coil in the accessory is modulated by one or more processors to transmit data in accordance with a wireless communication standard. For example, controller 370 or 570 may control power management circuit 360 or 560, respectively, which in turn may modulate power received via coil 170 to transmit data in accordance with a wireless communication standard. Figure 3 The Qi standard shown in Figure 5 As described above with respect to the example system, the data may include the energy state of the strap 130, the charging state of the strap 130, such as whether the power received from the watch body 110 meets the requirements of the strap 130, such as not meeting a threshold voltage, sensor data measured by the electronic component 160 in the strap 130, identification / authentication information from an RFID device, etc.

[0084] In block 1130, the one or more processors control the coil in the accessory to receive data from the coil in the accessory of the wearable device according to the wireless communication standard. For example, controller 370 or 570 may control power management circuit 360 or 560, respectively, which in turn may control coil 170 to receive data according to the wireless communication standard. Figure 3 The Qi standard shown in Figure 5 As described above with respect to the example system, the data may include the energy state of the watch body 110, the charging state of the watch body 110, instructions for the electronic component 160 of the strap 130, and the like.

[0085] In block 1140, power reception through the coil in the accessory is controlled based on the data received through the coil in the accessory. For example, the controller 370 or 570 may determine to accept power from the watch body 110 only when the data received from the watch body 110 indicates that the charge in the battery in the watch body 110 is not below a predetermined threshold, thereby avoiding depleting the power of the watch body 110. As another example, the controller 370 or 570 may determine not to charge the watch body 110 when the data received from the strap 130 indicates that the watch body 110 is currently being charged by a charger, thereby avoiding slowing down the charging of the watch body 110.

[0086] Although Fig.10 and Fig.11 Example operations of a wearable device are shown, but alternative or additional operations are possible. For example, a smart watch 100 with a wireless charging and communication system 700 or 800 may perform operations related to Fig.10 and Fig.11 Similar wireless charging and communication, but communication can be performed according to the Bluetooth standard. In addition, the data transmitted between the body of the wearable device and the accessory can be used for purposes other than managing wireless charging. For example, as described above with respect to the example system, identification / authentication data can be transmitted between the watch body 110 and the strap 130 for customization and / or security purposes. Sensor data and control signals can be transmitted between the watch body 110 and the strap 130 to generate output to the user. For example, the heart rate measured by the electronic component 160 of the strap 130 can be transmitted to the watch body 110 for display. As another example, a control signal can be sent from the watch body 110 to the strap 130 to generate a tactile output such as vibration to alert the user.

[0087] The present technology is advantageous because it provides bidirectional wireless charging and communication capabilities between the body of a wireless device and an accessory. Wireless charging and communication allow more functionality to be incorporated into a wearable device without adding significant weight or volume, for example by including additional components in the accessory without adding a battery in the accessory because the accessory can be charged wirelessly. Wireless charging and communication can reduce or eliminate the need for electrical connections between the body of the wearable device and the modular accessory, which can improve waterproofing or water resistance. Wireless communication between the body of the wearable device and the accessory can allow for intelligent and efficient charging based on various states of the body and / or accessory as described herein. Over-the-air (OTA) software updates can also be performed via wireless communication, which can provide further convenience to the user because the wearable device can be updated while being worn or used. In addition, wireless communication between the body of the wearable device and the modular accessory can provide simple customization and security options by linking the user profile with the radio frequency identification (RFID) in the modular accessory.

[0088] Unless otherwise stated, the foregoing alternative examples are not mutually exclusive, but may be implemented in various combinations to achieve unique advantages. Because these and other variations and combinations of the features discussed above can be utilized without departing from the subject matter defined by the claims, the foregoing description of the embodiments should be understood in a manner that illustrates, rather than limits, the subject matter defined by the claims. In addition, the provision of the examples described herein and the terms "such as," "including," etc. should not be interpreted as limiting the subject matter of the claims to specific examples; on the contrary, the examples are intended to illustrate only one of many possible embodiments. In addition, the same reference numerals in different figures may identify the same or similar elements.

Claims

1. A system for bidirectional wireless charging, comprising: A body adapted to be attached to an accessory, wherein the body comprises: A first coil, wherein the first coil is configured to: receiving power from a charger; inductively transmitting the power to the accessory; and receiving data from the second coil; and one or more first controllers; and the accessory, wherein the body and the accessory are configured to be worn by a user, wherein the accessory comprises the second coil configured to inductively receive the power from the first coil or the charger, Wherein, the one or more first controllers are configured to: determining whether the data received through the first coil indicates that the main body and the accessory are being worn; and When the data received through the first coil indicates that the main body and the accessory are not worn, the first coil is controlled to stop transmission of power.

2. The system according to claim 1, wherein: The body further includes a first power management circuit configured to control the power transmitted through the first coil and modulate the power transmitted through the first coil.

3. The system according to claim 1, wherein: The main body further includes one or more first controllers, the one or more first controllers being configured to: determining whether the data received through the first coil indicates that the power received through the first coil satisfies a threshold voltage of the accessory; as well as The first coil is controlled to stop transmission of power when the data received through the first coil indicates that the power transmitted through the first coil does not meet the threshold voltage of the accessory.

4. The system according to claim 1, wherein: The accessory further includes a power management circuit configured to control the second coil to receive data transmitted through the first coil.

5. The system according to claim 4, wherein: The power management circuit is further configured to modulate the power received via the second coil to transmit data.

6. The system according to claim 5, wherein: The power management circuit is configured to modulate the power received through the second coil by one of: amplitude shift keying (ASK) or load modulation.

7. The system according to claim 5, in, The power management circuit is further configured to compare the voltage of the received power to a threshold voltage; and Wherein the accessory further comprises one or more second controllers configured to generate the data to be transmitted through the second coil based on the comparison between the voltage of the received power and the threshold voltage.

8. The system according to claim 5, further comprising: one or more sensors configured to generate data indicating whether the subject and the accessory are being worn; Wherein, the accessory further comprises one or more second controllers, and the one or more second controllers are configured to: Determining whether the data from the one or more sensors indicates the the subject and the accessory are being worn; and Based on the determination that the main body and the accessory are not worn, the second The coil stops receiving power.

9. The system according to claim 4, wherein: The power management circuit is further configured to: The second coil is controlled to transmit power.

10. The system according to claim 1, wherein: The power is transmitted and received according to the standard.

11. A system for bidirectional wireless charging, comprising: A body adapted to be attached to an accessory, wherein the body comprises: a first coil configured to receive power from a charger and inductively transfer the power to the accessory; and The accessory, wherein the accessory comprises: a second coil configured to inductively receive the power from the first coil or the charger, and One or more second controllers, the one or more second controllers being configured to: determining whether data received via the second coil indicates that the first coil is being charged by a charger; and When the data received through the second coil indicates that the first coil is being charged by a charger, the second coil is controlled to stop receiving the power transmitted through the first coil or the charger.

12. A wearable device comprising: A body adapted to be attached to an accessory, wherein the body comprises: A first coil, wherein the first coil is configured to: receiving power from a charger; inductively transmitting the power to the accessory; and receiving data from the second coil; and one or more first controllers; and the accessory, wherein the body and the accessory are configured to be worn by a user, wherein the accessory comprises the second coil configured to inductively receive the power from the first coil or the charger, Wherein, the one or more first controllers are configured to: determining whether the data received through the first coil indicates that the main body and the accessory are being worn; and When the data received through the first coil indicates that the main body and the accessory are not worn, the first coil is controlled to stop transmission of power.

13. The wearable device according to claim 12, wherein: The body further includes a first power management circuit configured to control the power transmitted through the first coil and modulate the power transmitted through the first coil.

14. A method for bidirectional wireless charging, comprising: controlling, by one or more processors, power received by a coil in a body of the wearable device and transmitted through the coil to an accessory, wherein the body of the wearable device is adapted to be attached to an accessory, and wherein the main body and the accessory are configured to be worn by a user; controlling, by the one or more processors, power transmission through the coil in the body based on data received through the coil in the accessory; determining, by the one or more processors, whether the data received via the coil of the subject indicates that the subject and the accessory are being worn; and When the data received through the coil in the main body indicates that the main body and the accessory are not worn, the one or more processors control the coil in the main body to stop transmission of power.

15. The method according to claim 14, further comprising: controlling, by the one or more processors, the power transmitted through the coil in the body; as well as The power transmitted through the coil in the body is modulated by the one or more processors.

16. The method of claim 14, further comprising receiving, by the coil in the body, data from the coil in the accessory.

17. The method according to claim 16, further comprising: determining, by the one or more processors, whether the data received by the coil in the body indicates that the power transmitted through the coil in the body meets a threshold voltage of the accessory; as well as When the data received by the coil in the main body indicates that the power transmitted through the coil in the main body does not meet the threshold voltage of the accessory, the one or more processors control the coil in the main body to stop transmitting power.

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