JP2017051076A - Electronic equipment and programs - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the residual quantity of a battery with a small error without stopping charging during a power transmission period in a radio power transmission system in which a communication period and the power transmission period are repeated by time division.SOLUTION: An electronic apparatus includes: a power reception unit for receiving power transmitted by radio by a power transmission device; a charging unit for charging a battery by the power received by the power reception unit; a communication unit for communicating with the power transmission device; and a detection unit for detecting the voltage of the battery. The electronic apparatus repeats a charging period when the charging unit performs charging and a non-charging period when the charging is stopped and the communication unit performs communication, detects the voltage of the battery by using the detection unit in the non-charging period, and transmits charging information including information indicating the detected voltage to the power transmission device via the communication unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic device or the like that receives power wirelessly.

  Wireless power transmission systems that transmit power wirelessly are known. As one of such wireless power transmission systems, there is a system that executes power transmission and wireless communication in a time-sharing manner.

  As a method for simply detecting the remaining battery level when charging the battery, there is a method for detecting the remaining battery level by detecting the voltage of the battery. In such a method for detecting the remaining battery level, if the battery charge or discharge current amount when detecting the battery voltage is large, an error occurs between the detected result and the actual remaining battery level. . Patent Document 1 describes a technique for detecting the completion of charging (whether or not fully charged) based on the rate of change in battery voltage in the resting state in pulse charging in which the charging state and the resting state are periodically repeated. Has been.

JP 2011-109833 A

  However, Patent Document 1 deals with the pulse charging method, and if the technology of Patent Document 1 is applied to a wireless power transmission system that performs power transmission and wireless communication in a time-sharing manner, the voltage of the battery is not necessarily at the optimal timing. It will not be detected. For example, consider a configuration in which the technique described in Patent Document 1 is applied to a wireless power transmission system in which a communication period and a power transmission period are performed in a time-sharing manner. In this case, the configuration performs pulse charging during the power transmission period, generates a pause state due to pulse charge during the power transmission period (a state in which charging is stopped), and detects the rate of change in battery voltage during the pause state. . In such a configuration, since the suspension of charging occurs during the power transmission period, the determined power transmission period cannot be used effectively.

  Accordingly, the present invention provides a wireless power transmission system in which a communication period and a power transmission period are repeated in a time-sharing manner so that the remaining battery level can be detected with a small error without stopping charging during the power transmission period. Objective.

An electronic apparatus according to the present invention includes a power receiving unit that receives power transmitted wirelessly from a power transmission device, a charging unit that charges a battery with the power received by the power receiving unit, and a communication unit that communicates with the power transmission device And a detection means for detecting the voltage of the battery, a charging period for performing charging by the charging means, and a non-charging period for stopping charging and performing communication by the communication means, and the detection in the non-charging period Control means for detecting the voltage of the battery using the means and transmitting charging information including information indicating the detected voltage to the power transmission device via the communication means.
The program according to the present invention communicates with a power receiving unit that receives power transmitted wirelessly from a power transmission device, a charging unit that charges a battery with the power received by the power receiving unit, and the power transmission device. In the non-charging period, a communication unit, a detecting unit that detects the voltage of the battery, a charging period in which charging by the charging unit is performed, and a non-charging period in which charging is stopped and communication is performed by the communication unit are repeated. A program for detecting a voltage of the battery using the detection unit and causing the charging information including information indicating the detected voltage to be transmitted to the power transmission device via the communication unit.

  According to the present invention, in a wireless power transmission system in which a communication period and a power transmission period are repeated in a time division manner, the remaining battery level can be detected with a small error without stopping charging during the power transmission period.

It is a figure for demonstrating an example of a structure of the wireless power transmission system in Embodiment 1 and 2. FIG. 4 is a diagram for describing an example of a plurality of components included in the power transmission device 100 according to Embodiments 1 and 2 and an example of a plurality of components included in the electronic device 200 according to Embodiments 1 and 2. FIG. 6 is a flowchart for explaining an example of a charging process performed by the electronic device 200 according to the first embodiment. It is a figure for demonstrating a charge period and a non-charge period. It is a figure for demonstrating the detection timing of the voltage of the battery in 1st Embodiment. 10 is a flowchart for explaining an example of a charging process performed by the electronic device 200 according to the second embodiment. FIG. 10 is a diagram for explaining detection timing of a voltage of a battery 210 in the second embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

[Embodiment 1]
FIG. 1 is a diagram for explaining an example of the configuration of the wireless power transmission system according to the first and second embodiments.

  The wireless power transmission system according to the first and second embodiments includes a power transmission device 100 and an electronic device 200 as illustrated in FIG. The power transmission device 100 is configured to be able to operate as a power feeding device, and the electronic device 200 is configured to be able to operate as a power receiving device.

  In the wireless power transmission system according to the first and second embodiments, when the electronic device 200 is placed at a predetermined position of the power transmission device 100, the power transmission device 100 communicates wirelessly with the electronic device 200 via the antenna, and electronic Electric power can be transmitted to the device 200. When the distance between the power transmission device 100 and the electronic device 200 is within a predetermined range, the electronic device 200 wirelessly receives power supplied from the power transmission device 100 to the electronic device 200. Furthermore, the electronic device 200 can charge a battery connected to the electronic device 200 with the power received from the power transmission device 100.

  When the distance between the power transmission device 100 and the electronic device 200 does not exist within a predetermined range, the electronic device 200 cannot communicate with the power transmission device 100. Note that the predetermined range is a range in which the electronic device 200 can perform communication using the power supplied from the power transmission device 100. It is assumed that the power transmission device 100 can wirelessly supply power to a plurality of electronic devices in parallel.

  The electronic device 200 may be any device as long as the electronic device operates with power supplied from a connected battery. For example, the electronic device 200 may be an imaging device such as a smartphone, a digital camera, a camera-equipped mobile phone, a digital video camera, or the like. Alternatively, the electronic device 200 may be a playback device such as a player that plays back audio data and image data. Furthermore, the electronic device 200 may be a moving device such as a car.

  FIG. 2 is a diagram for describing an example of a plurality of components included in the power transmission device 100 according to the first and second embodiments and an example of a plurality of components included in the electronic device 200 according to the first and second embodiments.

  As illustrated in FIG. 2, the power transmission device 100 includes an antenna 101, a matching unit 102, a power transmission unit 103, and a CPU (Central Processing Unit) 104. At least one of the plurality of components included in the power transmission device 100 has a hardware configuration.

  The power transmission device 100 transmits power to the electronic device 200 via the antenna 101. In the power transmission apparatus 100, the CPU 104 performs various controls of the power transmission apparatus 100 by executing a program stored in the memory. The power transmission unit 103 supplies power from an external power source (for example, commercial power source) to the matching unit 102. The matching unit 102 resonates the power provided from the power transmission unit 103 at a predetermined oscillation frequency and provides the power to the antenna 101. The antenna 101 is an antenna for supplying the electric power provided from the matching unit 102 to the electronic device 200.

  The power transmitted by the power transmission device 100 as described above includes a first power and a second power. The first power is communication power that the power transmission device 100 supplies to the electronic device 200 in order to communicate a predetermined request or the like between the power transmission device 100 and the electronic device 200. The second power is power for charging / driving supplied to the electronic device 200 by the power transmission device 100. For example, the first power is a power of 0.1 W to 1 W or less, and the second power is a power of 1 W to 10 W. Note that the first power is equal to or lower than the second power. In the present specification, power transmission using the first power is referred to as “first power transmission”, and power transmission using the second power is referred to as “second power transmission”.

  When the power transmission device 100 supplies the first power to the electronic device 200, the power transmission device 100 can transmit a predetermined request to the electronic device 200. However, when the power transmission device 100 supplies the second power to the electronic device 200, the power transmission device 100 cannot transmit a predetermined request to the electronic device 200.

  In order to transmit a request for controlling the electronic device 200 to the electronic device 200, the power transmission device 100 modulates the power supplied to the electronic device 200 via the antenna 101 according to a predetermined protocol. The predetermined protocol is a communication protocol compliant with ISO / IEC 18092 standard such as RFID (Radio Frequency IDentification). However, the predetermined protocol may be, for example, a communication protocol compliant with the NFC (Near Field Communication) standard. The power transmission device 100 demodulates a response from the electronic device 200 to a predetermined request transmitted to the electronic device 200 and analyzes the content transmitted by the electronic device 200.

  Next, the electronic device 200 will be described with reference to FIG.

  As shown in FIG. 2, the electronic device 200 includes an antenna 201, a matching unit 202, a rectifying / smoothing unit 203, a communication control unit 204, a memory 204a, a system unit 220, a power supply control unit 208, and a charge control. Part 209 and battery 210. The system unit 220 includes a CPU (Central Processing Unit) 205, a first memory 206, a second memory 207, a timer 211, an instruction input unit 212, and a display unit 213. At least one of the plurality of components included in the electronic device 200 has a hardware configuration.

  The antenna 201 is an antenna for receiving power supplied from the power transmission device 100. The electronic device 200 receives power from the power transmission device 100 via the antenna 201 and receives a predetermined request or the like. The electronic device 200 transmits a request for controlling the power transmission apparatus 100 via the antenna 201, transmits a response corresponding to a predetermined request received from the power transmission apparatus 100, or transmits predetermined information as power. Or can be transmitted to the transmission apparatus 100. Note that the antenna 201 may be a helical antenna, a loop antenna, a meander antenna, or a planar antenna.

  The matching unit 202 includes a capacitor and a coil. The matching unit 202 is a circuit for performing matching so that the power transmission apparatus 100 efficiently receives the power supplied to the electronic device 200. The matching unit 202 supplies the power received via the antenna 201 to the rectifying / smoothing unit 203. The matching unit 202 supplies a part of the power received via the antenna 201 to the communication control unit 204 as a predetermined request with an AC waveform.

  The rectifying / smoothing unit 203 includes a rectifying diode or FET (Field effect transistor) and a smoothing capacitor. The rectifying / smoothing unit 203 converts AC power supplied from the matching unit 202 into DC power. Further, the rectifying / smoothing unit 203 supplies the DC power generated by the matching unit 202 to the power supply control unit 208.

  The communication control unit 204 analyzes the predetermined request supplied from the matching unit 202 according to the power transmission apparatus 100 and a predetermined communication protocol, and provides the analysis result to the CPU 205. The analysis result is provided to the CPU 205 by, for example, storing the analysis result in the memory 204a and accessing the CPU 205. When the CPU 205 stores a response to the predetermined request in the memory 204 a, a response to the predetermined request is transmitted via the antenna 201. The communication control unit 204 accesses the memory 204a according to the type of request. For example, if the predetermined request is a read request, the communication control unit 204 reads the data in the memory 204 a and transmits the data to the power transmission device 100. If the predetermined request is a write request, the communication control unit 204 stores the data received after the predetermined request in the memory 204a. The communication control unit 204 notifies the CPU 205 that a predetermined request has been received and data has been read from and written to the memory 204a.

  The communication control unit 204 generates a load modulation signal generated by changing ON / OFF a load such as a resistor included in the matching unit 202 in order to transmit a response to a predetermined request and predetermined information to the power transmission apparatus 100. Perform communication using. When the load included in matching unit 202 changes, in power transmission device 100, the current flowing through the power transmission antenna changes. Thereby, the power transmission device 100 can receive a response to a predetermined request transmitted from the electronic device 200 or can receive predetermined information.

  The memory 204 a is a memory existing inside the communication control unit 204 and is accessed from the power transmission device 100 and the CPU 205. When the power transmission apparatus 100 and the CPU 205 are accessed at the same time, access from the other is denied until one access is completed by exclusive control.

  The CPU 205 can transmit a response to the device authentication request from the power transmission apparatus 100 or transmit a response to the charge information request from the power transmission apparatus 100. The charging information will be described later. The CPU 205 controls each component of the electronic device 200 by executing a program stored in the first memory 206. The CPU 205 determines which request code corresponds to the request received by the communication control unit 204 according to the analysis result supplied from the communication control unit 204, and performs the process or operation specified by the request code. In this way, the electronic device 200 is controlled. Further, the CPU 205 can control execution and stop of the charging of the battery 210 performed by the charging control unit 209 using the power supplied from the power control unit 208. The CPU 205 can also acquire the remaining amount of the battery 210 from the detection result of the voltage of the battery 210. In the first and second embodiments, the CPU 205 can acquire the voltage of the battery 210 via the charge control unit 209.

  The first memory 206 stores one or more programs for the CPU 205 to control each component of the electronic device 200. The first memory 206 stores identification information of the electronic device 200 and the like. The identification information of the electronic device 200 is information indicating the ID of the electronic device 200, and further includes the manufacturer name of the electronic device 200, the device name of the electronic device 200, the date of manufacture of the electronic device 200, and the like. The second memory 207 stores information such as control parameters regarding each component of the electronic device 200, information transmitted from the power transmission apparatus 100, and the like.

  The power supply control unit 208 includes a switching regulator and a linear regulator, and supplies the DC power supplied from the rectifying and smoothing unit 203 to the charge control unit 209. The power supply control unit 208 supplies the DC power supplied from the rectifying / smoothing unit 203 to the entire electronic device 200 via the charge control unit 209. The power supply control unit 208 can stop power supply to the charging control unit 209 under the control of the CPU 205.

  The charging control unit 209 charges the battery 210 according to the power supplied from the power control unit 208. The charging control unit 209 periodically detects the charging state of the battery 210 connected to the electronic device 200, generates charging information, and stores the generated charging information in the memory 209a. Note that the charging information includes information indicating whether or not the battery 210 is fully charged, information indicating the temperature of the battery 210, information indicating the voltage of the battery 210, and the like. The charging control unit 209 can detect the voltage of the battery 210 in accordance with an instruction from the CPU 205 and store information indicating the detected voltage in the memory 209a.

  By using the charging control unit 209 as described above, the CPU 205 can know the charging state of the battery 210 by reading the charging information stored in the memory 209a. The CPU 205 can detect the voltage of the battery 210 at an arbitrary timing by instructing the charging control unit 209 to detect the voltage of the battery 210 and reading the voltage of the battery 210 from the memory 209a. However, the detection method of the voltage of the battery 210 by the CPU 205 is not limited to such a detection method, and other methods may be used. For example, the charging control unit 209 may detect the voltage of the battery 210 at a predetermined time interval to update the voltage value in the memory 209a, and the CPU 205 may read the voltage value from the memory 209a at an arbitrary timing. Note that the predetermined time interval in this case is, for example, a time interval at which the voltage of the battery 210 can be detected. The CPU 205 stores the acquired voltage of the battery 210 or, in addition to this, the charging information read from the memory 209 a in the second memory 207.

  The charging information includes information indicating whether or not the battery 210 is fully charged, in addition to the remaining amount information indicating the remaining capacity of the battery 210 and the battery voltage information. The charging information includes information indicating whether or not the battery 210 is activated. Here, the activation of the battery 210 means a state in which power can be stably supplied because the remaining amount of the battery 210 is greater than a certain level. The charging information may include information indicating the time that has elapsed since the charging control unit 209 started charging the battery 210. The charging information includes information indicating that the charging control unit 209 is performing constant voltage charging or constant current charging on the battery 210. The charging information includes information indicating that the charging control unit 209 is performing trickle charging or quick charging on the battery 210. The charging information includes information indicating the power necessary for charging the battery 210 and information indicating the temperature state of the battery 210. The charging information includes information indicating how much battery capacity is necessary for operating the electronic device 200. The charging information includes information on how much the battery capacity is reduced when the electric power from the power transmission device 100 is stopped, information indicating how many times the battery 210 has been charged, and the like.

  The battery 210 is a rechargeable secondary battery and can be detached from the electronic device 200. The battery 210 is a lithium ion battery, for example. The battery 210 supplies power to each component of the electronic device 200 via the charging control unit 209. The battery 210 supplies power to each component of the electronic device 200 when there is no power supplied from the power supply control unit 208. For example, when the first power at the time of communication from the power transmission device 100 is set low, or when the power supply from the power transmission device 100 is stopped, each component of the electronic device 200 from the battery 210 To supply power.

  The timer 211 measures the current time and the time related to the operation or processing performed in the electronic device 200. A threshold for the time measured by the timer 211 is stored in the first memory 206 in advance.

  The instruction input unit 212 provides a user interface that receives a user instruction to the electronic device 200. The instruction input unit 212 includes a power button for turning on / off the power of the electronic device 200, a mode switching button for switching the operation mode of the electronic device 200, and the like. Each button includes a switch, a touch panel, and the like. The CPU 205 controls the electronic device 200 in accordance with a user instruction input via the instruction input unit 212. Note that the instruction input unit 212 may supply the instruction received from the remote controller to the CPU 205.

  The display unit 213 includes a liquid crystal panel or an organic EL panel, and displays a menu or a captured image based on an instruction from the CPU 205. The display unit 213 may be configured in a movable shape such as a vari-angle.

  In the first and second embodiments, wireless power transmission between the power transmission device 100 and the electronic device 200 is performed by supplying power from the power transmission device 100 to the electronic device 200 wirelessly by magnetic resonance coupling or electric field resonance coupling. . However, the wireless power transmission method in the first and second embodiments is not limited to the method using magnetic field resonance coupling or electric field resonance coupling. For example, power is wirelessly supplied from the power transmission device 100 to the electronic device 200 by electric field coupling. It may be a method. Alternatively, a method in which power is wirelessly supplied from the power transmission device 100 to the electronic device 200 by electromagnetic induction may be used.

  In the first and second embodiments, it is assumed that the power transmission device 100 wirelessly supplies power to the electronic device 200, and the electronic device 200 receives power from the power transmission device 100 wirelessly. However, in Embodiments 1 and 2 and other embodiments, “wireless” may be rephrased as “no contact” or “non contact”.

  FIG. 3 is a flowchart for explaining an example of the charging process performed by the electronic device 200 according to the first embodiment. For example, the processing of this flowchart is realized by the CPU 205 executing a program stored in the first memory 206.

  When the power and the modulation signal output from the power transmission apparatus 100 in the first power transmission (power transmission by communication) are received by the antenna 201, the communication control unit 204 analyzes the signal and sends the analysis result to the CPU 205. provide. In step S301, the CPU 205 determines whether the analysis result is an authentication request. If it is determined that the request is an authentication request, the CPU 205 proceeds to step S302. Here, the authentication request is a request for authenticating whether or not the electronic device 200 with which the power transmission device 100 is in close proximity is a power transmission target device.

  In step S <b> 302, the CPU 205 transmits authentication information to the power transmission apparatus 100 via the communication control unit 204, the matching unit 202, and the antenna 201. In step S <b> 303, the CPU 205 waits to receive a request for charging information from the power transmission device 100. When the CPU 205 receives a request for charging information from the power transmission apparatus 100, the process proceeds to S304.

  In step S <b> 304, the CPU 205 detects the voltage of the battery 210. This detection timing is a timing when the charging control unit 209 is not charging and receives a request for charging information from the power transmission device 100, and is a timing suitable for the CPU 205 to detect the voltage of the battery 210. is there. If the charging control unit 209 detects the voltage of the battery 210 while charging the battery 210, the output voltage from the charging control unit 209 is detected, resulting in a voltage value higher than the single voltage of the battery 210. An error occurs in the remaining amount value acquired based on the voltage. Since the voltage of the battery 210 immediately after the request for charging information from the power transmission device 100 is detected, the electronic device 200 can communicate the latest remaining amount of the battery 210 to the power transmission device 100. .

  In step S <b> 305, the CPU 205 determines whether the battery 210 is fully charged from the detected voltage of the battery 210. Note that whether or not the battery is fully charged may be determined by reading out charging information stored in the memory 209a of the charging control unit 209. In step S <b> 306, the CPU 205 transmits charging information to the power transmission device 100.

  In step S <b> 307, the CPU 205 waits to receive information (power transmission stop information) indicating that power transmission has been stopped or power transmission is not performed from the power transmission apparatus 100. When power transmission stop information is received from the power transmission device 100, no further power transmission output is received from the power transmission device 100. Therefore, the CPU 205 ends the charging process. If the CPU 205 does not receive power transmission stop information from the power transmission apparatus 100 for a certain period, the CPU 205 proceeds from S307 to S308.

  In step S <b> 308, the CPU 205 waits to receive from the power transmission apparatus 100 the power transmitted by the second power transmission (power transmission using charging / driving power). When the CPU 205 detects reception of power by the second power transmission, the process proceeds to S309. The CPU 205 detects the reception of the second power transmission by detecting the DC voltage after rectification and smoothing by the rectification and smoothing unit 203.

  In step S309, the CPU 205 instructs the charging control unit 209 to charge the battery 210. Here, since it is desirable that the charging control unit 209 is in a state in which charging is performed as an initial state, the CPU 205 does not necessarily have to instruct the charging control unit 209 to charge. In this case, for example, the charging control unit 209 automatically performs charging when power is supplied from the power control unit 208, and does not perform charging when there is no power supplied from the power control unit 208. Become. In this case, the power supply control unit 208 does not supply power to the charging control unit 209 when power transmission by the first power is performed, and charging control when power transmission by the second power is performed. Power is supplied to the unit 209. Once charging is started, the CPU 205 may stop the system operation of the system unit 220, which is an operation other than charging, and perform only charging. In this case, when the CPU 205 determines that power transmission is stopped in S307, the operation other than charging is resumed.

  Next, in S310, the CPU 205 determines whether or not the battery 210 is fully charged. The voltage of battery 210 measured during charging is affected by charging power. Therefore, in S310, it is the charge control unit 209 that detects the fully charged state of the battery 210, and the CPU 205 determines whether or not the fully charged state is obtained by reading the information in the memory 209a of the charge control unit 209. The charging control unit 209 detects that the battery 210 is in a fully charged state by detecting a charging voltage and a charging current during charging. If the CPU 205 determines that the battery 210 is fully charged, the process proceeds to S312 in order to stop the charging operation. If it is determined that the battery is not fully charged, the CPU 205 proceeds to step S311.

  In step S311, the CPU 205 determines whether or not the power transmission period has ended. If the power transmission period has not ended, the CPU 205 returns to S310. When starting the charging operation in S309, the CPU 205 sets the timer 211, measures the time, and determines whether or not the power transmission period has ended based on whether or not the timer value has reached a predetermined power transmission period. On the other hand, if it is determined in S311 that the power transmission period has ended, the CPU 205 advances to S312. In the first embodiment, the timer 211 is used to detect the elapse of a predetermined time from the start of charging, thereby shifting from the charging period to the non-charging period. However, the first embodiment has such a configuration. It is not limited. For example, the CPU 205 may control to shift from the charging period to the non-charging period based on the magnitude of the transmitted power from the power transmission device 100 (when the transmitted power becomes a predetermined value or less). Note that the magnitude of transmitted power can be acquired by the CPU 205 monitoring the output (DC power) of the rectifying and smoothing unit 203.

  In step S312, the CPU 205 instructs the charging control unit 209 to stop charging. Even if the CPU 205 does not instruct to stop charging, the charging control unit 209 may stop the charging operation when the power supply from the power supply control unit 208 is stopped. When it is determined that the charging period has ended in this way, the CPU 205 returns to S303 and shifts to the communication period (non-charging period). In the communication period, the CPU 205 waits for a request for charging information from the power transmission device 100. When receiving the request for charging information, the CPU 205 proceeds from S303 to S304. In S304, the CPU 205 detects the voltage of the battery 210. In step S <b> 306, the CPU 205 transmits the remaining amount of the battery 210 detected in step S <b> 304 to the power transmission apparatus 100.

  By performing the charging process as described above, in the wireless power transmission system in which communication and power transmission are performed in a time-sharing manner, the electronic device 200 can detect the voltage of the battery 210 at an appropriate timing. Here, the power transmission period in which the power transmission device 100 performs the second power transmission, the communication period in which the power transmission device 100 performs the first power transmission, the charging period in which the electronic device 200 charges the battery 210, and the electronic device A period during which the voltage of battery 210 is detected by 200 will be described with reference to FIGS. 4 and 5.

  FIG. 4 is a diagram for explaining a power transmission period (corresponding to a charging period) and a non-charging period in which detection of the voltage of the battery 210 is executed. The horizontal axis represents time and the vertical axis represents power. As is clear from FIG. 4, the electronic device 200 charges the battery 210 (charging period) during the power transmission period (charging period) in which the power transmission device 100 transmits power with the second power. The electronic device 200 detects the voltage of the battery 210 in a non-charging period including a communication period in which the power transmission device 100 transmits power with the first power.

  FIG. 5 is a diagram for explaining the timing of detecting the voltage of battery 210 in more detail. As shown in FIG. 5A, the CPU 205 detects the voltage of the battery 210 during communication. FIGS. 5B and 5C are diagrams for illustrating in detail the communication period during the communication of FIG. 5A. In FIG. 5B, a communication period is defined from when the electronic device 200 receives a request for charging information from the power transmission device 100 to when the electronic device 200 transmits a response to the power transmission device 100. In this case, it can be said that the timing at which the CPU 205 detects the voltage of the battery 210 is in communication. In FIG. 5C, a period during which the electronic device 200 receives a request for charging information from the power transmission device 100 is defined as one communication period, and another time is required while a response is transmitted from the electronic device 200 to the power transmission device 100. It is defined as the communication period. In this case, the timing at which the CPU 205 detects the voltage of the battery 210 can be said to be between communications.

  Thus, although the expression of the timing at which the CPU 205 detects the voltage of the battery 210 changes depending on how the communication period is defined, the electronic device 200 transmits charging information to the power transmission apparatus 100 during the non-charging period. The voltage detection period may be up to. The CPU 205 may detect the voltage of the battery 210 during this voltage detection period. Therefore, the voltage of battery 210 may be detected while receiving a request for charging information. As a response to the received request for charging information, electronic device 200 transmits a response including the detected voltage of battery 210 to power transmission device 100.

  As described above, according to the wireless power transmission system of the first embodiment, in the wireless power transmission system in which the communication period and the power transmission period are repeated in a time-sharing manner, only charging is performed in the power transmission period, and charging is performed during the power transmission period. Since it is not stopped, a limited power transmission period can be used efficiently. Since the voltage of the battery 210 is detected in the non-charging period including the communication period for notifying the power transmission apparatus 100 of the charging information (including the remaining amount of the battery 210, etc.) The voltage of the battery 210 can be detected.

[Embodiment 2]
Next, Embodiment 2 will be described with reference to FIGS. 6 and 7. In the first embodiment, the CPU 205 included in the electronic device 200 detects the voltage of the battery 210 during the communication period with the power transmission device 100 during the non-charging period (or between communication and communication). On the other hand, in the second embodiment, the CPU 205 detects the voltage of the battery 210 before communication with the power transmission device 100 during the non-charging period. The configuration of the wireless power transmission system of the second embodiment, the configuration of the wireless power transmission device, and the electronic device are the same as those of the first embodiment (FIGS. 1 and 2).

  FIG. 6 is a flowchart for explaining an example of a charging process performed by the electronic device 200 according to the second embodiment. The charging process of the first embodiment (FIG. 3) and the charging process of the second embodiment (FIG. 6) are different in timing at which the CPU 205 detects the voltage of the battery 210. In FIG. 6, steps that perform the same processing as in FIG. 3 are assigned the same reference numerals, and descriptions thereof are omitted.

  In the first embodiment, the CPU 205 waits to receive a request for charging information from the power transmission apparatus 100 after transmitting authentication information (S302) (S303), and detects the voltage of the battery 210 after receiving the request for charging information. Then, charging information is transmitted to the power transmission apparatus 100 (S306). After stopping the charging operation (S312), the CPU 205 returns to S303.

  On the other hand, in the second embodiment, the CPU 205 detects the voltage of the battery 210 in S403 after transmitting the authentication information to the power transmission apparatus 100 in S302. After that, in S404, the CPU 205 determines whether or not the battery 210 is fully charged from the detected voltage of the battery 210, and waits for a request for charging information from the power transmission apparatus 100 in S405. When a request for charging information from the power transmission device 100 is received, the CPU 205 transmits charging information based on the voltage of the battery 210 detected in S403 to the power transmission device 100 (S306). After stopping the charging operation in S312, the CPU 205 returns to S403. In this way, the charging period in which the battery 210 is charged and the non-charging period in which charging is stopped and communication is performed by the communication control unit 204 are repeated. As described above, in the second embodiment, the voltage of the battery 210 is detected according to the detection of the transition from the charging period to the non-charging period (S311).

  FIG. 7 is a diagram for explaining the timing at which the CPU 205 according to the second embodiment detects the voltage of the battery 210. As shown in FIG. 7, the CPU 205 detects the voltage of the battery 210 after the end of the power transmission period (charging period) and before the communication in the non-charging period.

  As described above, in the electronic device 200 according to the second embodiment, since the voltage of the battery 210 is detected before receiving the request for charging information from the power transmission device 100, there is a request for charging information from the power transmission device 100. In this case, charging information can be transmitted. For this reason, according to the electronic device 200 of the second embodiment, it is possible to shorten the time until the response to the request for charging information is transmitted, and it is possible to apply to a system having a shorter non-charging period than the first embodiment. Become.

[Embodiment 3]
The various functions, processes, and methods described in the first and second embodiments can also be realized by using a program by a personal computer, a microcomputer, a CPU (Central Processing Unit), or the like. Hereinafter, in the third embodiment, a personal computer, a microcomputer, a CPU, and the like are referred to as “computer X”. In the third embodiment, a program for controlling the computer X and realizing the various functions, processes, and methods described in the first and second embodiments is referred to as “program Y”.

  The various functions, processes, and methods described in the first and second embodiments are realized by the computer X executing the program Y. In this case, the program Y is supplied to the computer X via a computer-readable storage medium. The computer-readable storage medium according to the third embodiment includes at least one of a hard disk device, a magnetic storage device, an optical storage device, a magneto-optical storage device, a memory card, a volatile memory, and a nonvolatile memory. The computer-readable storage medium in the third embodiment is a non-transitory storage medium.

100: Power transmission device, 200: Electronic equipment, 101, 201: Antenna, 102, 202: Matching unit, 103: Power transmission unit, 104, 205: CPU, 204: Communication control unit, 206: First memory, 207: Second memory 208: power supply control unit 209: charge control unit 210: battery

Claims (13)

Power receiving means for receiving the power transmitted by radio from the power transmission device;
Charging means for charging the battery with the power received by the power receiving means;
Communication means for communicating with the power transmission device;
Detecting means for detecting the voltage of the battery;
A charging period in which charging is performed by the charging unit and a non-charging period in which charging is stopped and communication is performed by the communication unit are repeated, and the voltage of the battery is detected using the detection unit in the non-charging period, and detection is performed. An electronic apparatus comprising: control means for transmitting charging information including information indicating the measured voltage to the power transmission device via the communication means.   The electronic device according to claim 1, wherein the control unit detects the voltage of the battery during the non-charging period and before transmitting the charging information via the communication unit.   The electronic device according to claim 1, wherein the control unit detects a voltage of the battery during the non-charging period and between communication performed via the communication unit.   4. The electronic device according to claim 3, wherein the communication is between the reception of a request for charging information from the power transmission device and the transmission of charging information to the power transmission device. 5. machine.   The electronic device according to claim 1, wherein the control unit detects a voltage of the battery in response to receiving a request for charging information from the power transmission device.   The electronic device according to claim 1, wherein the control unit detects a voltage of the battery by the detection unit in response to detection of a transition from the charging period to the non-charging period.   6. The control unit according to claim 1, wherein the control unit shifts from the charging period to the non-charging period by detecting an elapse of a predetermined time from the start of charging by the charging unit. The electronic device described.   The electronic device according to claim 1, wherein the control unit shifts from the charging period to the non-charging period based on transmission power from the power transmission device.   The charge information includes at least one of information indicating a remaining amount of the battery, information indicating a voltage value of the battery, and information indicating that the battery is activated. The electronic device according to any one of the above.   The electronic device according to claim 1, wherein the detection unit periodically detects a charging voltage and a charging current of the battery to determine whether or not the battery is fully charged. .   11. The control unit stops operation during the charging period in the configuration of the electronic device excluding the configuration including the power receiving unit, the charging unit, the communication unit, and the detection unit. The electronic device according to any one of the above.   The electronic device according to claim 1, wherein the communication unit communicates with the power transmission device via the power receiving unit. Computer
Power receiving means for receiving the power transmitted by radio from the power transmission device;
Charging means for charging the battery with the power received by the power receiving means;
Communication means for communicating with the power transmission device;
Detecting means for detecting the voltage of the battery;
A charging period in which charging is performed by the charging unit and a non-charging period in which charging is stopped and communication is performed by the communication unit are repeated, and the voltage of the battery is detected using the detection unit in the non-charging period, and detection is performed. The program for functioning as a control means which transmits the charge information containing the information which shows the voltage which was performed to the said electric power transmission apparatus via the said communication means.

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