Wearable device and battery and power supply system used thereby

Abstract

The present invention provides an HMD (100), comprising: a plurality of power receiving units (102a, b) capable of mounting a first battery and a second battery (200a, b) and receiving power from the first battery and the second battery through wireless transmission; a power management unit (106) for monitoring the states of the first battery and the second battery; a communication unit (108) for performing wireless communication with the first battery and the second battery; and a plurality of restricting units (104a, b) for restricting the power received through the plurality of power receiving units. A control unit (101) restricts the power supplied to a load through the restricting units according to the power usage status of the load within the device, and the power management unit obtains information on the remaining battery levels of the first battery and the second battery through the communication unit and displays the obtained information on a display (119). Thereby, power required for driving the device can be supplied in a state where the HMD is being worn, enabling the HMD to be continuously used.

Description

Technical Field

[0001] The present invention relates to a non-contact power supply technology for powering wearable devices such as head-mounted displays (hereinafter referred to as HMDs). Background Art

[0002] As a non-contact power supply technology for powering wearable devices used by users while wearing them, the following technologies are known.

[0003] Patent Document 1 discloses a structure related to electronic glasses having a zoom lens and its charging device. The charging device is put on the leg sleeve part of the electronic glasses, and power is supplied from the power transmission coil of the charging device to the power receiving coil of the electronic glasses by electromagnetic induction to charge the driving battery of the electronic glasses.

[0004] Patent Document 2 discloses a structure for a wearable device that has a heating part for heating the front part in front of the user's eyes. The front part is heated by the heat generation of a wire wound around the front part, and the wire is a power receiving coil that receives power supply non-contact from an external power transmission coil.

[0005] Patent Document 3 discloses a structure related to a power supply system for powering an electronic device (such as a glasses-type device) from a secondary battery module. A flexible secondary battery, a power transmission part for non-contact power transmission, and a flexible thermoelectric power generation device are accommodated in a strip part of the secondary battery module, and power is transmitted from the power transmission part of the secondary battery module to the power receiving part of the electronic device by non-contact power transmission.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2009-251068

[0009] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2016-032213

[0010] Patent Document 3: Japanese Unexamined Patent Application Publication No. 2016-073196 Summary of the Invention

[0011] Technical Problem to be Solved by the Invention

[0012] In recent years, HMDs have been able to realize functions similar to those of wearable computers, smartphones, and tablet computers. In addition, glasses-type transmissive HMDs have gained attention as core devices for augmented reality (AR) technology, and immersive HMDs have gained attention as core devices for virtual reality (VR) technology. In addition, HMDs are also used to watch movies and play games.

[0013] However, as HMDs become more multifunctional, their power consumption increases, and the usable time is too short for the existing battery capacity, so it is impossible to wear HMDs for continuous use. To deal with such problems, the HMD has to be connected to an external power source via a cable for charging, or the use of the HMD has to be interrupted to charge the battery, which is troublesome for users. In order to be able to wear HMDs for continuous use, the capacity of the battery can be increased, but the weight will increase accordingly. In particular, glasses-type HMDs are like ordinary glasses, and the weight of the device is borne by the user's ears and nose, so the weight increase must be suppressed as much as possible so as not to affect the wearing experience. In addition, HMDs are also like mobile terminals. Although they are being miniaturized and thinned, it is troublesome to connect cables when charging or using them, and users have increasingly higher requirements for simple charging methods. Therefore, for wearable devices that are often worn on the body, it is very important to be able to wear them for continuous use and eliminate the trouble of connecting cables.

[0014] In the above-mentioned Patent Document 1, in order to charge the driving battery of the electronic glasses, the user needs to put the portable charging device on the leg cover of the electronic glasses. When installing or removing the portable charging device, the electronic glasses will move or have to be temporarily removed from the head, temporarily interrupting the use of the electronic glasses. That is, it can be considered that it is difficult for the user to continue using the electronic glasses while wearing them. In addition, Patent Document 1 also records a method of installing a portable charger on the leg cover of the electronic glasses and connecting it to an external power source for charging in this state, but there is still the problem of the trouble of connecting the cable. In addition, the portable charging device is connected to the charger through an external terminal, thereby having a terminal exposed to the outside. When worn on the head, there are concerns about short circuits and terminal corrosion caused by sweat.

[0015] The above-mentioned Patent Document 2 discloses that a power receiving coil is formed by a wire wound around the front part of the eye of a wearable device, and power is supplied to the power receiving coil in a non-contact manner from an external power transmission coil. At this time, in order to receive the desired power supply from the external power transmission coil, the distance between the power transmission coil and the power receiving coil must be close. This is to suppress the radio waves leaking to the surroundings during power transmission within the allowable value. As described in Patent Document 2, when the electronic glasses are placed on a charging stand or the like so that the power transmission coil and the power receiving coil are close to each other, the desired power transmission can be performed. However, in the state where the user wears and uses the wearable device, the external power transmission coil must be close to the front part of the eye (the position of the power receiving coil), which will obstruct the vision of the user using the wearable device. That is, it can be expected that sufficient power cannot be supplied in the state where the user wears the wearable device.

[0016] In the above-mentioned Patent Document 3, an electronic device (eyeglass-type device) receives power in a non-contact manner from a belt-shaped secondary battery module worn on the waist. In this case, considering the distance from the user's waist to the head, it can also be expected that it is difficult to supply the power consumption of eyeglass-type devices such as HMDs. In addition, Patent Document 3 discloses that the secondary battery can also be charged via a cable from the terminal portion. However, as described above, charging via a cable is troublesome for the user.

[0017] An object of the present invention is to provide a wearable device that can supply the power required for device driving in the state where the wearable device is worn and used, and is less troublesome for the user to use, in view of the problems of the above-mentioned prior art.

[0018] Technical means for solving the problem

[0019] An example of the present invention is as follows. A wearable device, characterized in that it includes: a plurality of power receiving parts that can at least mount a first battery and a second battery and receive power from the first battery and the second battery through wireless transmission; a power management part that monitors the states of the mounted first battery and second battery; a communication part that performs wireless communication with the mounted first battery and second battery; a display that provides information to the user; a plurality of restriction parts that restrict the power received through the plurality of power receiving parts; and a control part that controls the power receiving part, the power management part, the communication part, the display, and the restriction part. The control part restricts the power supplied to the load through the restriction part according to the power usage condition of the load in the wearable device, and the power management part obtains information on the remaining power of the mounted first battery and second battery through the communication part and displays the obtained remaining power information on the display.

[0020] Further, the plurality of restricting portions have a function of preventing reverse current flowing toward the first battery and the second battery. When the power management unit determines that the remaining power of the first battery in use is less than a threshold value, the control unit controls the reverse-current prevention function of the restricting portion to switch the power receiving system from the first battery in use to the second battery in standby, and displays a warning on the display to remind the user to replace the first battery in use.

[0021] The battery of the present invention can be installed on a wearable device to supply power and can be charged by a charger, and is characterized by including: a storage battery unit for storing power; a power transmission and reception unit capable of wirelessly transmitting power from the storage battery unit to the wearable device and capable of receiving power from the charger to charge the storage battery unit; a conversion unit for converting direct current and alternating current between the storage battery unit and the power transmission and reception unit; a power storage state recognition unit for detecting and storing the remaining power or power storage state information of the storage battery unit; a communication unit for wirelessly communicating with the wearable device and the charger; and a control unit for controlling the power transmission and reception unit, the power storage state recognition unit, and the communication unit, wherein the power storage state recognition unit can send information on the remaining power of the storage battery unit to the wearable device through the communication unit and can send the power storage state information of the storage battery unit to the charger, and the control unit stops transmitting power from the storage battery unit to the wearable device when receiving a control command from the wearable device through the communication unit.

[0022] Furthermore, the power supply system of the present invention includes a wearable device, a battery for powering the wearable device, and a charger for charging the battery. It is characterized in that the wearable device includes: a plurality of power receiving units that can at least mount a first battery and a second battery and receive power from the first battery and the second battery through wireless transmission; a power management unit that monitors the states of the installed first battery, second battery, and a third battery that is being charged by the charger; a communication unit that performs wireless communication with the installed first battery, second battery, and the charger; and a display that provides information to the user. The first battery to the third battery include: a first storage battery unit that stores power; a power transmission and reception unit that can transmit power from the first storage battery unit to the wearable device through wireless transmission and can receive power from the charger to charge the first storage battery unit; a storage state identification unit that detects and stores the remaining power of the first storage battery unit or the storage state information during charging; and a communication unit that performs wireless communication with the wearable device and the charger. The charger includes: a second storage battery unit that stores power; a power transmission unit that transmits power from the second storage battery unit to the third battery being charged through wireless transmission; a charging battery monitoring unit that obtains the storage state information of the third battery being charged; and a communication unit that performs wireless communication with the wearable device and the third battery. The wearable device displays the information on the remaining power obtained from the installed first battery and second battery and the storage state information of the third battery being charged obtained from the charger on the display. When it is determined that the remaining power of the first battery in use is less than the threshold, the power receiving system is switched from the first battery in use to the second battery in standby, and a warning to remind the user to replace the first battery in use is displayed on the display.

[0023] Effects of the Invention

[0024] According to the present invention, it is possible to supply the required power while the user is wearing the wearable device, so that the device can be continuously used. For example, when the user is watching a movie with a long viewing time, there will be no problem of affecting the wearing experience due to adding the mounted battery, and there is no trouble of connecting a power supply cable from the terminal of the wearable device to an external power supply, which can improve the usability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a diagram showing the overall structure of a power supply system composed of an HMD, a battery, and a charger (Embodiment 1).

[0026] Figure 2 FIG. is a block diagram showing the internal structure of the HMD100.

[0027] Figure 3 It is a block diagram showing the internal structure of the battery 200.

[0028] Figure 4 It is a block diagram showing the internal structure of the charger 300.

[0029] Figure 5A It is a diagram showing the power transmission between the HMD 100 and the batteries 200a, b in use.

[0030] Figure 5B It is a diagram showing the power transmission between the battery 200c being charged and the charger 300.

[0031] Figure 6A It is a diagram showing the communication between the HMD, the battery in use, and the charger.

[0032] Figure 6B It is a diagram showing the communication between the HMD, the battery being charged, and the charger.

[0033] Figure 7A It is a diagram showing an example of displaying various function menus of the HMD on the display.

[0034] Figure 7B It is a diagram showing an example of displaying the status of the battery on the display.

[0035] Figure 8 It is a diagram showing the data transmission between the power supply system and the cloud.

[0036] Figure 9 It is a diagram showing the control of the power transmission between the HMD and the battery (Example 2).

[0037] Figure 10 It is a flowchart showing the process of removing the battery in use from the HMD.

[0038] Figure 11 It is a flowchart showing the process of switching from the battery in use to the standby battery.

[0039] Figure 12 It is a flowchart showing the process when the battery detaches from the HMD.

[0040] Figure 13 It is a diagram showing the actions of installing the battery on the HMD and the charger (Example 3).

[0041] Figure 14 It is a diagram showing an example of the power system circuit inside the battery.

[0042] Figure 15 It is a diagram showing an example of the internal structure of the battery.

[0043] Figure 16 This is a diagram showing the state when the battery is installed on the HMD.

[0044] Figure 17 This is a diagram showing other examples of the internal structure of the battery.

[0045] Figure 18 This is a diagram showing Figure 17 a modified example of

[0046] Figure 19 This is a diagram showing the structure of the charger 400 for charging the battery when it is installed on the HMD.

[0047] Figure 20A This is a diagram showing the structure of the power supply system (Example 4) that supplies power to the HMD not only from the battery but also from the charger 500.

[0048] Figure 20B This is a diagram showing Figure 20A a specific application example of the power supply system of Detailed Embodiments

[0049] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention should not be construed as being limited to the descriptions of the following embodiments. Those skilled in the art can easily understand that within the scope not departing from the spirit and main points of the present invention, its specific structure can be changed. In the structures of the invention described below, for the same part or parts having the same function, the same reference numerals may sometimes be used in different drawings and repeated descriptions may be omitted.

[0050] Example 1

[0051] In Example 1, the basic structure for supplying power to the wearable device of the present invention will be described. Among them, a glasses-type head-mounted display (hereinafter referred to as HMD) is taken as an example of the wearable device used by the user wearing it on the body. A plurality of batteries are installed on the HMD. When the remaining power of the battery in use is insufficient, it is removed from the HMD and charged using a charger. When the battery is being charged, the other batteries switched to standby supply power to the HMD, so that the user can continuously use the HMD. At this time, power is transmitted wirelessly (non-contact) between the HMD and the battery, and between the battery and the charger, and information such as the remaining power and the charging amount of the battery is transmitted through mutual communication.

[0052] Figure 1FIG. 0 is a diagram showing the overall structure of a power supply system composed of an HMD 100, a battery 200, and a charger 300. First, the basic operation will be described. In the glasses-type HMD 100, the "temples" part (temple parts 114) on the left and right sides of the glasses has power receiving parts 102a and 102b, and two batteries 200a and 200b are installed. Electric power is supplied from the batteries 200a and 200b to the power receiving parts 102a and 102b through power transmission and reception coils. Here, a structure with two batteries is adopted, but of course, it can also be two or more.

[0053] When using the HMD 100 causes the remaining power of one battery 200a to become insufficient, a warning of insufficient remaining power is displayed on the display 119 of the HMD 100. The user removes the battery 200a from the power receiving part 102a and inserts it into the charging slot 311 of the charger 300 (in this example, there are four slots 311a to 311d). During this period, the HMD 100 switches to the other battery 200b that is on standby and continues to operate.

[0054] During the operation of the charger 300 to charge the battery 200a, electric power is also supplied through the power transmission and reception coils. When the battery 200a is fully charged, the charging completion is notified on the display part of the HMD 100, and the user removes the battery 200a and installs it on the power receiving part 102a of the HMD 100. In this way, since multiple batteries are installed on the HMD 100 and used alternately, the user can continuously use the HMD 100. However, the operation of replacing the battery 200 on the HMD 100 and the operation of inserting the battery into the charger 300 are performed while the user is wearing the HMD 100, so the following improvements have been made.

[0055] Very close to the rear of the power receiving part 102a on the HMD 100 for installing the battery 200, an infrared sensor 115a is provided facing the outside of the temple part. Similarly, an infrared sensor 115b is also provided on the opposite power receiving part 102b. When the user wants to remove the battery 200a installed on the power receiving part 102a, the finger can be inserted into the recessed part at the rear end of the power receiving part 102a to easily remove the battery 200a. At this time, the infrared sensor 115a near the rear end of the power receiving part 102a can detect that the user brings the hand closer in order to remove the battery 200a. If the user mistakenly tries to remove the battery 200b (right eye side) on the opposite side instead of the battery 200a (left eye side), the infrared sensor 115b near the power receiving part 102b on the right eye side detects the approach of the user's hand and issues a warning that the battery that should be replaced currently is not the battery on the right eye side but the battery on the left eye side, thereby preventing the user's misoperation.

[0056] Next, the user inserts the removed battery 200a into any one of the plurality of charging slots 311a to 311d of the charger 300 and sets it. The slot number portions 312a to 312d corresponding to the respective charging slots protrude in the shape of numbers, and the user can touch them with a finger to identify the slot number and the orientation of the charger. In addition, the slot number portion 312 lights up a red LED when the battery starts charging and lights up a green LED when charging is completed. For the battery 200 inserted in the charging slot 311, a red LED 215 is also lit when charging starts, and a green LED 215 is lit when charging is completed.

[0057] The glasses-type HMD 100 can be worn on the head and removed from the head by unfolding the temple parts. Strain sensors 116a and 116b are provided at the ends of the temple parts on the display part side, and the strain sensors 116a and 116b are used to detect the unfolding when the HMD is worn, so as to know that it is removed from the head. If the detection signals of the strain sensors 116a and 116b do not change for a specified time (for example, 1 minute), the HMD 100 automatically switches to the standby mode, and when the detection signal changes again, the operation of the HMD is started. Thereby, the power consumption of the HMD 100 can be saved. A camera 120 and an infrared sensor 115c are provided on the front side of the HMD 100.

[0058] Next, the structures of the HMD 100, the battery 200, and the charger 300 will be described.

[0059] Figure 2 It is a block diagram showing the internal structure of the HMD 100. The HMD 100 is composed of a control unit 101, a memory unit 105, a power management unit 106, a sensor unit 107, a communication unit 108, a data output unit 109, and a data input unit 110. The control unit 101 controls the overall operation of the HMD 100.

[0060] The memory unit 105 stores information on the internal state of the HMD 100 and the power storage state of the battery 200, and stores image data to be displayed on the HMD. The power management unit 106 includes a power receiving unit 102, a conversion unit 103, and a limiting unit 104 for receiving power from the battery 200 in use, and supplies power to each unit in the HMD 100. The power receiving unit 102 has a power receiving coil capable of receiving power wirelessly. In addition, the power management unit 106 monitors the states of the battery 200 being used in the HMD 100, the battery 200 being charged in the charger 300, and the built-in battery. The frequency counter 121 detects whether the battery 200 in use is removed (detached). The details of these operations will be described later.

[0061] The sensor unit 107 includes an infrared sensor 115 and a strain sensor 116, and may also include an acceleration sensor, a gyro sensor, a magnetic sensor, a temperature sensor, an electrostatic sensor, a tactile sensor, etc. as required. The communication unit 108 includes a wireless LAN and Bluetooth (registered trademark) for wireless communication with the battery 200 and the charger 300, and may also have a "One-Seg" mobile broadcast function and a position information acquisition function based on GPS (Global Positioning System).

[0062] The data output unit 109 includes a display 119 that displays images and information provided to the user at the position of the lens unit of the glasses, a speaker (earphone) that outputs sound, a light-emitting element, etc. The data input unit 110 includes a camera 120 that captures the scenery in front of the HMD 100, a microphone that inputs sound, an operation input unit for inputting the user's operations, etc.

[0063] Figure 3 It is a block diagram showing the internal structure of the battery 200. The battery 200 includes a control unit 204, a communication unit 205, a memory unit 206, a remaining charge state identification unit 207, a power storage unit 208, and a display unit 209. The control unit 204 controls the overall operation of the battery 200.

[0064] The communication unit 205 includes a wireless LAN and Bluetooth (registered trademark) for wireless communication with the HMD 100 and the charger 300. The memory unit 206 stores information on the internal state of the battery 200, and can also store image data to be displayed on the HMD 100.

[0065] The remaining charge state identification unit 207 detects the remaining charge or the charge amount of the battery and holds this information. The power storage unit 208 includes a power transmission and reception unit 203 that transmits or receives power between the storage battery unit 201 composed of power storage elements, the conversion unit 202, the HMD 100, and the charger 300. The power transmission and reception unit 203 has a power transmission and reception coil for wirelessly transmitting and receiving power. The display unit 209 is an LED 215 that displays the charge amount of the battery in different colors.

[0066] In addition, in the following description, the battery 200 is distinguished as 200a to 200d according to its usage state (during use in the HMD and during charging in the charger) (the same applies to the internal structure of the battery).

[0067] Figure 4is a block diagram showing the internal structure of the charger 300. The charger 300 is composed of a control unit 301, a communication unit 302, a memory unit 303, a battery monitoring unit 304 during charging, a display unit 305, and a power supply unit 306. The control unit 301 controls the overall operation of the charger 300.

[0068] The communication unit 302 includes a wireless LAN and Bluetooth (registered trademark) for wireless communication with the HMD 100 and the battery 200. Further, it may also have a GPS-based location information acquisition function and a "One-Seg" function.

[0069] The memory unit 303 stores information on the internal state of the charger 300 and the charge state of the battery 200, and can also save image data to be displayed on the HMD 100.

[0070] The battery monitoring unit 304 during charging obtains information on the charge amount of the battery 200 being charged. The display unit 305 is an LED that displays the start and completion of battery charging in different colors.

[0071] The power supply unit 306 includes a storage battery unit 307 for supplying power to the battery 200, a conversion unit 308, and a power transmission unit 309. The power transmission unit 309 has a power transmission coil for wirelessly transmitting power. In addition, the number of the display unit 305 and the power supply unit 306 corresponds to the number of the charging slots 311.

[0072] Here, the storage battery unit 307 of the power supply unit 306 can be charged by an external power source. Moreover, the external power source can be used in accordance with the usage status of the HMD 100. When the HMD 100 is used for a long time in one place, such as watching a movie, the power supply unit 306 can be connected to an external power source such as the commercial power supply for use. On the other hand, when the HMD 100 is carried around, the charged storage battery unit 307 is used to charge the battery 200 of the HMD.

[0073] In Figures 2 to 4 , the power transmission unit / receiving unit includes a power transmission coil / receiving coil, and the communication unit includes an antenna. However, for simplicity, their illustrations are omitted in the figure.

[0074] Figure 5A and Figure 5B are diagrams for explaining the power transmission among the HMD 100, the battery 200, and the charger 300. Among them, Figure 5A represents the power transmission between the HMD 100 and the batteries 200a, b in use, Figure 5B represents the power transmission between the battery 200c being charged and the charger 300.

[0075] In Figure 5A, multiple (two in this case) batteries 200a and 200b can be installed on the HMD100, and power can be supplied from each of the batteries 200a and 200b. DC current flows out from the battery storage units 201a and 201b of the battery, and is converted into an AC current of 150 kHz by the conversion units 202a and 202b, for example. Then, power is transmitted to the HMD100 wirelessly from the power transmission units 203a and 203b (power transmission coils).

[0076] The HMD100 has multiple power receiving units 102a and 102b (power receiving coils), and receives power wirelessly transmitted at a frequency of 150 kHz, for example, from each of the batteries 200a and 200b. In the conversion units 103a and 103b, the received AC current is converted into a specified DC current. The limiting units 104a and 104b supply DC current to the control unit 101, and limit the supplied power according to the power usage status of the load within the HMD100. Therefore, the control unit 101 sends a control signal for power limitation to the limiting unit 104 based on the power usage status of the load, but this is omitted in the figure.

[0077] Regarding the usage method of the multiple batteries 200a and 200b in the HMD100, it can be set by selecting the control process of the control unit 101. For example, the battery with less remaining power can be preferentially used. In addition, by configuring the power receiving units 102a and 102b and the conversion units 103a and 103b to enable two-way power transmission and power conversion, it can be set that one power receiving unit, for example 102a, always has the battery 200a installed, and the other power receiving unit 102b is dedicated to battery replacement. Thus, it is also possible to achieve the setting that the power required for the operation of the HMD100 is provided by the battery 200b installed in the power receiving unit 102b, and at the same time, power is stored in the battery 200a. In this case, even if one hand cannot be used due to some reasons, it is possible to continuously use the HMD100 for a long time - a usage time exceeding the capacity of a single battery - while wearing the HMD100.

[0078] In this way, by having multiple batteries and using another battery as the power source of the HMD100 during battery replacement, the HMD can also be continuously used during battery replacement. Further, the built-in battery included in the power management unit 106 of the HMD100 can also be utilized. The capacity of the built-in battery is smaller than that of the installed batteries 200a and 200b, but by making it have a battery capacity sufficient to enable the HMD100 to operate fully during battery replacement, the HMD can also be continuously used during battery replacement. However, in the case where the battery cannot be replaced within the specified time, the HMD100 itself is turned off to ensure data security, etc.

[0079] Figure 5BIndicates the power transmission (charging operation) from the charger 300 to the battery 200c. In the power supply unit 306 of the charger 300, the direct current generated by the storage battery unit 307 is converted into alternating current by the conversion unit 308 and transmitted wirelessly from the power transmission unit 309 (power transmission coil) to the battery 200c being charged. In the power storage unit 208 of the battery 200c, the power transmitted from the charger 300 is received by the power receiving unit 203c (power receiving coil), converted into direct current by the conversion unit 202c, and stored in the storage battery unit 201c.

[0080] Figure 6A and Figure 6B is a diagram for explaining the communication among the HMD 100, the battery 200, and the charger 300. Among them, Figure 6A indicates the communication regarding the battery 200a (200b) in use, Figure 6B and indicates the communication regarding the battery 200c being charged.

[0081] In Figure 6A , the communication unit 108 of the HMD 100 performs wireless communication with the communication unit 205a of the battery 200a (200b) in use, and the power management unit 106 of the HMD 100 obtains the information on the remaining battery power obtained by the power storage state identification unit 207a of the battery 200a, b in use. Further, the communication unit 108 of the HMD 100 performs wireless communication with the communication unit 302 of the charger 300 and sends the information on the remaining battery power of the battery 200a, b in use obtained by the HMD 100. In addition, based on the power usage status of the loads within the HMD 100, the communication unit 108 of the HMD 100 sends control commands such as stopping power transmission from the control unit 101 to the battery 200a, b in use.

[0082] In Figure 6B , the communication unit 302 of the charger 300 performs wireless communication with the communication unit 205c of the battery 200c being charged, and the charging battery monitoring unit 304 of the charger 300 obtains the information (charge amount) on the power storage state of the battery 200c obtained by the power storage state identification unit 207 of the battery 200c. Further, the communication unit 108 of the HMD 100 performs wireless communication with the communication unit 302 of the charger 300, and the power management unit 106 of the HMD 100 obtains the information on the power storage state of the battery 200c being charged. In addition, based on the remaining battery power of the battery 200a, b in use and the power usage status of the loads within the HMD 100, the communication unit 108 of the HMD 100 sends control commands such as charging start / stop from the control unit 101 to the charger 300, and the charger 300 controls the battery 200c being charged according to the command.

[0083] In this way, the HMD 100 and the charger 300 communicate with each other to transmit the remaining power of the batteries 200a and 200b in use and the state information of the battery 200c being charged, and store them in their respective memory units 105 and 303.

[0084] Figure 7A and Figure 7B An example of the display showing the battery status on the display 119 of the HMD 100.

[0085] Figure 7A This is an example of displaying various function menus of the HMD on the display 119. The user selects the menu 701 regarding the battery from this menu panel. To confirm the battery status, this menu 701 is activated, or it is always in the activated state.

[0086] Figure 7B This is an example of displaying the battery status on the display 119. The left display 119a shows a warning to remind the user to replace the battery, and the right display 119b shows the information of the charge amount of the batteries in each charging slot. When the remaining power of the battery is low, a warning "Low remaining power of the left battery" to remind the user to replace the battery is automatically displayed on the display 119a of the left eye of the HMD 100. At this time, in order not to cause misunderstanding to the user, this warning is displayed on the side of the battery with less remaining power. When such a display is made, the user replaces the left battery.

[0087] At this time, on the display 119b of the right eye on the opposite side, the charge amount of the battery being charged in each slot is displayed in a bar graph. This display example shows the case where the charge amount of the battery in slot number 2 is the largest, and the number 312b (number 2) of the battery charging slot 311b blinks with a green LED on the charger 300, and the LED of this battery 200 also blinks green. When such a display is made, the user can take out the battery being charged in the charging slot 311b and install it on the HMD.

[0088] According to the structure of the above Embodiment 1, the user can replenish power by replacing the battery while wearing the HMD100, and can continuously use the HMD without interrupting its use. This situation where the battery of the device can be replaced while the device is in use is called "hot swappable". In addition, the power transmission from the battery 200 to the HMD100 and the power transmission from the charger 300 to the battery 200 are short-range wireless power transmissions, so the required power can be easily transmitted. Further, since the battery 200 has a structure in which the metal terminals are not exposed to the outside, even when the HMD is worn on the user's head and used, there will be no problems such as terminal corrosion caused by sweat or short circuit between terminals when replacing the battery, and safe use can be achieved. For example, when the user watches a movie with a long viewing time, it will not affect the wearing experience due to the addition of the mounted battery, and there is no trouble of connecting a power supply cable from the terminals of the wearable device to an external power supply, which can improve the usability.

[0089] Here, as a modification of Embodiment 1, a structure for downloading large-capacity data from the cloud using the power supply system of this embodiment will be described.

[0090] Figure 8 It is a diagram showing data transmission between the power supply system of this embodiment and the cloud 600. The power supply system is composed of the HMD100, the battery 200a being used (worn) in the HMD, the charger 300, and the battery 200c being charged in the charger.

[0091] The data transmission between the HMD100 and the cloud 600 includes the case of downloading image data and the like to be viewed on the HMD100 from the cloud 600 (reference numeral 601a), and the case of uploading the image data obtained by the data input unit 110 (camera 120) of the HMD100 to the cloud 600 (reference numeral 601b). In either case, the data is directly transmitted between the HMD100 and the cloud 600, so there are problems such as time consumption for transmitting large-capacity data such as movies and possible insufficient battery capacity. Therefore, in the structure of this embodiment, data transmission is performed using the charging time of the charging battery 200.

[0092] The communication unit 302 of the charger 300 downloads data from the cloud 600 and stores it in the memory 206c of the battery 200c being charged. When using the fully charged battery 200c in the HMD 100, the data stored in the memory unit 206a of the battery 200a in use is read for viewing (path of reference numeral 602a). Conversely, for the data generated by the HMD 100, the memory unit 105 is used as a cache, and the data is stored in the memory unit 206 of the battery 200a in use. When charging this battery using the charger 300, the stored data is read from the memory unit 206c of the battery 200c and uploaded to the cloud 600 through the communication unit 302 of the charger 300 (path of reference numeral 602b). In this way, the HMD 100 uses the memory unit of the battery 200 during charging to transfer data to and from the cloud 600, achieving the effect of being able to efficiently transfer a large amount of data.

[0093] Embodiment 2

[0094] Embodiment 2 describes a structure for implementing the replacement of the battery of the HMD while using the HMD, that is, the hot-swap function.

[0095] Figure 9 It is a diagram showing the control of power transmission between the HMD and the battery. In the shown structure, the HMD 100 is equipped with multiple batteries 200a and 200b, and switching is performed between them.

[0096] In the HMD 100, the restricting units 104a and 104b are provided with a reverse current preventing diode D, a current detection resistor R, a MOS field effect transistor (MOSFET) M1, and a storage capacitor C on the power lines supplied from the respective batteries 200a and b. The control unit 101 cuts off the power received from the battery 200 by performing on / off control of the MOSFET (M1).

[0097] In addition, the power management units 106a and 106b of the HMD 100 include amplifiers and frequency counters 121a and b to detect whether the battery 200 is detached from the HMD 100. When the battery 200 is removed (detached), the resonance frequency of the wireless power supply of the power receiving units 102a and b changes, so the frequency counter 121 can be used to monitor the resonance frequency to detect whether the battery is removed.

[0098] On the other hand, in batteries 200a and 200b, MOS field-effect transistors (MOSFETs) M2a and M2b are provided between the storage battery units 201a and 201b and the conversion units 202a and 202b within the power storage units 208a and 208b. By controlling the MOSFET (M2) using the control units 204a and 204b, the current flowing from the storage battery units 201a and 201b to the conversion units 202a and 202b is restricted. In addition, the remaining power of battery 200 is judged by the power storage state recognition units 207a and 207b measuring the voltage VB between the terminals of the storage battery units 201a and 201b.

[0099] The following describes the processing steps when replacing the battery being used on the HMD.

[0100] Figure 10 It is a flowchart showing the process of removing a battery with insufficient remaining power during use from the HMD.

[0101] For the battery 200 in use, the power storage state recognition unit 207 reads the voltage VB (remaining power) between the terminals of the storage battery unit 201 and transmits it to the HMD100 through communication with the HMD100 (S101). The HMD100 compares the received voltage VB with a preset first threshold Vth1 (S102). If the voltage VB is greater than the threshold Vth1, the battery can continue to be used, so it returns to S101. However, when the voltage VB is less than the threshold Vth1, a warning such as "Low battery remaining power" is displayed on the display 119 of the HMD100 (S103). Specifically, as Figure 7B shown, the warning is displayed on the display 119a on the side of the battery with less remaining power.

[0102] If the battery 200 is used further, the battery 200 reads the voltage VB between the terminals and communicates this voltage (S104). The HMD100 compares the received voltage VB with a preset second threshold Vth2 (where Vth2 < Vth1) (S105). During the period when the voltage VB is greater than the threshold Vth2, since the battery can continue to be used, it returns to S104. However, when the voltage VB is less than the threshold Vth2, the process of removing the battery is performed.

[0103] The HMD100 turns off the MOSFET (M1) of the restricting unit 104 (S106) to prevent a reverse current from flowing to the battery 200 side. Further, an instruction to turn off the MOSFET (M2) is issued to the battery 200 in use to stop the current flowing out from the storage battery unit 201 (S107). At this stage, a warning "Please replace the battery" is displayed on the side of the display 119 of the HMD100 where the battery with less remaining power is located (S108).

[0104] The user removes the battery 200 from the HMD 100 (S109), and the communication between the battery 200 and the HMD 100 is disconnected (S110).

[0105] For safety reasons, instead of the two thresholds Vth1 and Vth2, for example, a third threshold Vth3 with a remaining power margin of about 10% is also set to enable the user to perform a battery replacement operation when there is still a surplus in the battery power margin.

[0106] Figure 11 It is a flowchart showing the process of switching to the standby battery when the remaining power of the battery in use is insufficient. Here, an example of switching from the left battery 200a to the right battery 200b is described.

[0107] Among them, the terminal voltage VB (remaining power) of the battery storage unit 201a of the battery 200a in use is read and compared with the first threshold Vth1 and the second threshold Vth2 (S201 to S205). The process up to this point is the same as that of Figure 10 S101 to S105. Then, when the voltage VB is less than the threshold Vth2 (S205 is "Yes"), the switch is made from the battery 200a to 200b.

[0108] First, the control unit 101 of the HMD 100 turns off the MOSFET (M1a) of the limiting unit 104a on the side of the battery 200a in use, and further turns off the MOSFET (M2a) of the battery 200a in use to stop the current flowing out from the battery storage unit 201a (S206). Next, the MOSFET (M1b) of the limiting unit 104b on the side of the standby battery 200b is turned on, and the MOSFET (M2b) of the standby battery 200b is further turned on to start the current flowing out from the battery storage unit 201b (S207). Thus, the power receiving system is switched from the battery 200a to 200b. During this switching period, the power of the HMD 100 is provided by the power stored in the capacitor Ca of the limiting unit 104a and the built-in battery of the HMD 100. Thus, the operation of the HMD 100 will not be interrupted due to the battery switch.

[0109] After that, a warning "Please replace the battery" is displayed on the left display 119a of the HMD 100 (S208). The user removes the battery 200a (S209), and the communication between the battery 200a and the HMD 100 is disconnected (S210).

[0110] Figure 12 It is a flowchart showing the process when the battery is detached from the HMD. It describes the process of cutting off the power supply not only when replacing the battery but also when the battery falls off for some reason.

[0111] The HMD 100 monitors the resonance frequency FR of the power receiving unit 102 (power receiving coil) through the frequency counter 121 of the power management unit 106 (S301). When the battery 200 in use is detached from the power receiving unit 102 or deviates from the specified position, the resonance frequency FR changes. When the frequency counter 121 detects this frequency change (S302 is "Yes"), the control unit 101 of the HMD 100 turns off the MOSFET (M1) of the limiting unit 104 (S303). And, communicate from the communication unit 108 of the HMD 100 to the battery 200 to turn off the MOSFET (M2) of the battery 200 and stop the current flowing from the battery unit 201 (S304). At this stage, a warning "Battery has fallen off" is displayed on the display 119 of the HMD 100 on the side of the fallen-off battery (S305).

[0112] According to Embodiment 2, when replacing the battery of the HMD 100, the user can continuously use the HMD 100 without interrupting its operation, and the hot-swap function can be realized.

[0113] Embodiment 3

[0114] In Embodiment 3, the structure of the battery 200 suitable for installation in the HMD 100 or the charger 300 is described.

[0115] Figure 13 It is a diagram showing the operation of installing the battery 200 in the HMD 100 and the charger 300. On the battery mounting surface of the power receiving unit 102 of the HMD 100, a plurality of magnets 111a, 111b, 111c are installed. Although a plurality of magnets are installed here, it can also be one. In addition, ferrite of the same shape is installed in the battery 200. These magnets and ferrite are used for aligning the power transmission and reception coils between the HMD 100 and the battery 200, and reducing the leakage of the magnetic field. On the other hand, the charger 300 is also installed with magnets of the same shape to align the power transmission and reception coils between the charger 300 and the battery 200, and reduce the magnetic field leakage.

[0116] Figure 14 It is a diagram showing an example of the power system circuit in the battery 200. The battery 200 is composed of a battery unit 201, a conversion unit 202, and a power transmission and reception unit 203. The conversion unit 202 is a bidirectional converter for DC / AC conversion, and the coil 203L of the power transmission and reception unit 203 can be used in both power transmission and reception cases. The structure of the battery will be described in detail below.

[0117] Figure 15FIG. 0 is a diagram showing an example of the internal structure of battery 200. FIG. (a) is a perspective view of the battery cover on the upper side of the housing 214, and FIG. (b) is a cross-sectional view taken along line α-α'. As shown in FIG. (b), a storage battery section 201, a circuit board 213, and a ferrite plate 211 are installed in a resin housing 214, for example. Ferrite cylinders 212a, 212b, 212c and a coil 203L are installed on the ferrite plate 211.

[0118] Figure 16 FIG. 4 is a diagram showing the state when battery 200 is installed on HMD 100. FIG. (a) is a diagram of HMD with the battery installed, and FIGS. (b) and (c) are cross-sectional views taken along line β-β'. In FIG. (b), the temple part 114 of HMD 100 has a shape that completely covers the upper and lower surfaces of the housing 214 of the battery, while in FIG. (c), it has a shape that holds a part of the lower part of the housing 214. In the case of FIG. (c), battery 200 can be fixed by attracting the ferrite 212 and 211 of battery 200 with the magnet 111 of HMD 100.

[0119] In FIGS. (b) and (c), at the power receiving section 102 of HMD 100, a magnet 111 is arranged together with a coil 102L on a ferrite plate 113. Alignment (position alignment) of the coil 102L of HMD 100 and the coil 203L of battery 200 can be achieved by the magnet 111 and the ferrite cylinder 212 of battery 200. In addition, during power transmission, the magnetic field generated by the coil 203L passes through the ferrite plates 211, 113, the magnet 111, and the ferrite cylinder 212, so magnetic field leakage can be reduced.

[0120] Figure 17 FIG. 11 is a diagram showing another example of the internal structure of battery 200. FIG. (a) is a perspective view of the battery cover on the upper side of the housing 214, and FIG. (b) is a cross-sectional view taken along line α-α'. In this example, two sets of coils 203L and ferrites 211, 212 are respectively arranged on both sides inside the housing 214 of battery 200. After battery 200 is installed, the coils 203L and ferrites 211, 212 of the two sets that are closer to the power receiving section 102 of HMD 100 can be used. Thus, the user does not need to care about which side is the installation side when installing battery 200.

[0121] Figure 18 FIG. 15 shows Figure 17 a modified example. In this example, the ends of the two sets of coils 203L arranged on both sides inside the housing 214 are connected so that they form one coil. In other words, one coil is folded at approximately the middle position and arranged on both sides inside the housing 214. In this case, the structure of battery 200 also has symmetry, so it is easy to install it on HMD 100 and set it in charger 300.

[0122] Figure 19 FIG. 0 is a diagram showing the structure of a charger 400 that charges the battery 200 while being installed on the HMD 100. The operation of the charger 400 is the same as that of the charger 300 in the first embodiment. However, this figure is used to illustrate the structure of the charging unit, and other structures such as the circuit board inside the charger are omitted. Here, the battery 200 adopts Figure 17 the structure, and shows the state where the HMD 100 equipped with the battery 200 is set on the charger 400. The cross-sectional shape of the temple 114 of the HMD 100 is Figure 16 the shape shown in FIG. (b) in FIG. (a) is a top view, (b) is a γ-γ' cross-sectional view, and (c) is a partial enlarged view.

[0123] The charger 400 has a middle raised portion 401 and charging portions 402a and 402b raised on both sides thereof. The temple 114 of the HMD 100 is received between 401 and 402a, b. As shown in the enlarged view (c), on the inner wall of the charging portion 402a, a power transmission coil 403L for charging the battery and a magnet 411 are arranged on the ferrite plate 413.

[0124] In the battery 200 installed on the temple 114 of the HMD 100, the left coil 203L in the figure faces the coil 403L of the charger 400. The coil 203L of the battery 200 is a coil that is common for power transmission and reception, and can charge the battery 200 from the coil 403L of the charger 400. In addition, due to the attractive force between the magnet 411 of the charger 400 and the ferrite cylinder 212 of the battery 200, the coil 403L of the charger 400 and the coil 203L of the battery 200 are automatically aligned, and sufficient power transmission efficiency can always be obtained. In addition, when power is transmitted, the magnetic field generated by the coil 403L passes through the ferrite plates 413, 211, the ferrite cylinder 212, and the magnet 411, so the magnetic field leakage is less. For example, if the HMD 100 is placed on the charger 400 overnight, the battery 200 can be fully charged. In addition, by adopting Figure 8 the structure, data such as required movies can be downloaded from the cloud 600.

[0125] According to the structure of the third embodiment, it is easy to install the battery 200 on the HMD 100 and the charger 300, and the power transmission efficiency is improved. In addition, by adopting Figure 19 the structure, the battery 200 while being installed on the HMD 100 can be simply charged.

[0126] Embodiment 4

[0127] In the fourth embodiment, a structure in which the HMD can be powered not only from the battery but also directly from the charger is described.

[0128] Figure 20A FIG. Figure 20A is a diagram showing the structure of the power supply system according to Embodiment 4, capable of supplying power to the HMD from a battery and a charger. In this example, the flow of power when power is supplied to the HMD 100 from two batteries 200a and 200b and also from two chargers 500a and 500b other than the battery is described. Two chargers are used here, but the number is arbitrary, and in addition, a structure in which a plurality of chargers are integrated can also be adopted.

[0129] In the batteries 200a and 200b, a direct current flows out from the battery unit 201, is converted into an alternating current by the conversion unit 202, and power is transmitted to the HMD 100 wirelessly from the power transmission unit 203, for example, at a frequency of 150 kHz. This is the same as the operation of Figure 5A . On the other hand, the chargers 500c and 500d also have a battery unit 501, a conversion unit 502, and a power transmission unit 503, and power is similarly transmitted to the HMD 100 wirelessly from the power transmission unit 503.

[0130] The HMD 100 has four power receiving units 102a, 102b, 102c, and 102d. When power is supplied from the batteries 200a and 200b, the power receiving system using the power receiving units 102a and 102b is used, and when power is supplied from the charger 500, the power receiving system using the power receiving units 102c and 102d is used. In each power receiving system, after power is received by the power receiving unit 102, it is converted into a specified direct current by the conversion unit 103, and the limiting unit 104 limits the received power based on the power usage status of loads such as the communication unit 108 controlled by the control unit 101. In addition, by enabling two-way power conversion and transmission between the conversion unit 103 and the power receiving unit 102, the batteries 200a and 200b can be charged using the power supplied from the chargers 500c and 500d.

[0131] Figure 20B FIG. Figure 20B is a diagram showing a specific application example of the power supply system of Figure 20A . Here is an example where the driver uses the HMD. The batteries 200a and 200b are installed on the temple parts of the HMD. On the other hand, the power transmission units 503c and 503d of the chargers 500c and 500d are arranged, for example, on the headrest of the seat. The power receiving units 102c and 102d of the HMD 100 that receive power from the power transmission units 503c and 503d are arranged symmetrically left and right on the temple parts near the headrest, for example, on the leg covers. When the driver is sitting on the seat, power supply from the charger 500 is preferentially used, and furthermore, the battery 200 can also be charged. Once the driver leaves the seat, the power supply is switched to the battery 200.

[0132] According to the structure of Embodiment 4, it is possible to achieve continuous use for a long time - a usage time exceeding the battery capacity - while wearing the HMD.

[0133] In each of the embodiments described above, the power supply structure has been described by taking a glasses-type head-mounted display (HMD) as an example. However, the present invention is of course not limited thereto, and it can be similarly applied in the case of other wearable devices.

[0134] Explanation of Reference Numerals

[0135] 100: Head-mounted display (HMD), 101: Control unit, 102: Power receiving unit, 102L: Coil, 103: Conversion unit, 104: Limiting unit, 105: Memory unit, 106: Power management unit, 107: Sensor unit, 108: Communication unit, 109: Data output unit, 110: Data input unit, 111: Magnet, 113: Ferrite plate, 114: Temple, 115: Infrared sensor, 116: Strain sensor, 119: Display, 120: Camera, 121: Frequency counter,

[0136] 200: Battery, 201: Battery unit, 202: Conversion unit, 203: Power transmission and reception unit, 203L: Coil, 204: Control unit, 205: Communication unit, 206: Memory unit, 207: Battery state identification unit, 208: Battery storage unit, 209: Display unit, 211: Ferrite plate, 212: Ferrite cylinder, 213: Circuit board, 214: Housing, 215: LED,

[0137] 300: Charger, 301: Control unit, 302: Communication unit, 303: Memory unit, 304: Battery monitoring unit during charging, 305: Display unit, 306: Power supply unit, 307: Battery unit, 308: Conversion unit, 309: Power transmission unit, 311: Battery charging slot, 312: Battery slot number,

[0138] 400: Charger, 401: Raised portion, 402: Charging unit, 403L: Coil, 411: Magnet, 413: Ferrite plate, 500: Charger, 600: Cloud.

Claims

1. A wearable device that can be worn and used by a user, characterized in that, Comprising: A plurality of power receiving units that can at least install a first battery and a second battery and receive power from the first battery and the second battery through wireless transmission; A power management unit that monitors the states of the installed first battery and second battery; A communication unit that performs wireless communication with the installed first battery and second battery; A display that provides information to the user; A plurality of limiting units that limit the power received through the plurality of power receiving units; And A control unit that controls the power receiving unit, the power management unit, the communication unit, the display, and the limiting unit, wherein, The control unit restricts the power supplied to the load through the limiting unit according to the power usage status of the load in the wearable device, The power management unit obtains information on the remaining power of the installed first battery and second battery through the communication unit and displays the obtained remaining power information on the display.

2. The wearable device according to claim 1, characterized in that: The plurality of limiting units have the function of preventing reverse current flowing to the side of the first battery and the second battery, When the power management unit determines that the remaining power of the first battery in use is less than the threshold, the control unit controls the reverse current prevention function of the limiting unit to switch the power receiving system from the first battery in use to the second battery in standby, and, Displays a warning on the display to remind the user to replace the first battery in use.

3. The wearable device according to claim 1 or 2, characterized in that: The power management unit has a frequency counter that monitors the resonance frequency between the coils of the power receiving unit and the first battery in use, When the resonance frequency being monitored by the frequency counter changes, the control unit determines that the first battery in use has detached from the power receiving unit and displays a warning on the display notifying the user that the first battery in use has detached.

4. The wearable device according to claim 2, characterized in that: When the control unit determines that the remaining power of the first battery in use is less than the threshold, or determines that the first battery in use has detached from the power receiving unit, it sends a control command to the first battery in use through the communication unit to stop power transmission to the wearable device.

5. The wearable device according to claim 3, characterized in that: When the control unit determines that the remaining power of the first battery in use is less than the threshold, or determines that the first battery in use has detached from the power receiving unit, it sends a control command to the first battery in use through the communication unit to stop power transmission to the wearable device.

6. The wearable device according to claim 1, characterized in that: The communication unit can also perform wireless communication with a charger that is performing a charging operation on a third battery, Obtains the power storage state information of the third battery being charged from the charger and displays the obtained power storage state information on the display. The control unit sends a control command for the charging operation of the third battery being charged to the charger through the communication unit.

7. A battery that can be installed on a wearable device to supply power and can be charged by a charger, characterized in that, Comprising: A storage battery unit for storing electric power; A power transmission and reception unit capable of wirelessly transmitting electric power from the storage battery unit to the wearable device and receiving electric power from the charger to charge the storage battery unit; A conversion unit for converting direct current and alternating current between the storage battery unit and the power transmission and reception unit; A power storage state identification unit for detecting and storing the remaining power or power storage state information of the storage battery unit; A communication unit for wirelessly communicating with the wearable device and the charger; And A control unit for controlling the power transmission and reception unit, the power storage state identification unit, and the communication unit, wherein The power storage state identification unit can send information on the remaining power of the storage battery unit to the wearable device through the communication unit and can send the power storage state information of the storage battery unit to the charger; When the control unit receives a control command from the wearable device through the communication unit, it stops transmitting electric power from the storage battery unit to the wearable device.

8. A power supply system, comprising a wearable device, a battery for powering the wearable device, and a charger for charging the battery, characterized in that: The wearable device includes: A plurality of power reception units capable of mounting at least a first battery and a second battery and receiving electric power from the first battery and the second battery through wireless transmission; A power management unit for monitoring the states of the mounted first battery, second battery, and a third battery being charged by the charger; A communication unit for wirelessly communicating with the mounted first battery, second battery, and the charger; and A display for providing information to the user, The first battery to the third battery include: A first storage battery unit for storing electric power; A power transmission and reception unit capable of wirelessly transmitting electric power from the first storage battery unit to the wearable device and receiving electric power from the charger to charge the first storage battery unit; A power storage state identification unit for detecting and storing the remaining power or the power storage state information during charging of the first storage battery unit; and A communication unit for wirelessly communicating with the wearable device and the charger, The charger includes: A second storage battery unit for storing electric power; A power transmission unit for wirelessly transmitting electric power from the second storage battery unit to the third battery being charged; A charging battery monitoring unit for obtaining the power storage state information of the third battery being charged; and A communication unit for wirelessly communicating with the wearable device and the third battery, Wherein The wearable device displays on the display the information of the remaining power obtained from the installed first battery and second battery, and the power storage state information of the third battery being charged obtained from the charger. When it is determined that the remaining power of the first battery in use is less than the threshold value, the power receiving system is switched from the first battery in use to the second battery in standby, and a warning is displayed on the display to remind the user to replace the first battery in use.

9. The power supply system according to claim 8, wherein: The coils used in the power receiving part of the wearable device, the power transmission and reception part of the battery, and the power transmission part of the charger are arranged on a ferrite plate. When the battery is installed on the wearable device and the charger, the positional alignment between the coils is performed by the attractive force between the magnet arranged at the relative position of the installation surface and the ferrite plate.

10. The power supply system according to claim 9, wherein: The coils used in the power transmission and reception part of the battery are arranged on two opposite surfaces of the battery case. In a state where one surface of the battery case is installed on the wearable device, the other surface of the battery case can be installed on the charger to perform the charging operation of the battery.

11. The power supply system according to claim 8, wherein: The wearable device includes a second power receiving part, and the second power receiving part can receive power from a second charger different from the charger without passing through the battery. The received power is used to perform the charging operations of the installed first battery and second battery.

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