JP2018133855A - Power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device capable of communicating with either of an electronic apparatus capable of performing communication only and an electronic apparatus capable of performing both communication and reception of power by means of non-contact power supply.SOLUTION: A power supply device 100 comprises: first power supply means which supplies power in a non-contact manner; first communication means which performs communication while modulating the first power supply means; second power supply means which supplies power that is larger than the first power supply means; second communication means which performs communication while modulating the second power supply means; and third power supply means which supplies power larger than the second power supply means. When performing communication with an electronic apparatus capable of receiving power that is supplied by the third power supply means, the communication is performed by the second communication means. When performing communication with an electronic apparatus incapable of receiving power that is supplied by the third power supply means, polling for apparatus detection is performed by the first communication means while combining the first communication means and the second communication means.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power feeding device and a power feeding system.

  2. Description of the Related Art In recent years, a charging system is known that includes a power feeding device that outputs power wirelessly without being connected by a connector, and an electronic device that charges a battery with the power supplied wirelessly from the power feeding device. In such a charging system, a power supply device that performs data communication for transmitting a command to an electronic device and transmission of electric power to the electronic device via the same antenna is known (Patent Document 1).

  In such a power supply apparatus, it is conceivable to perform communication and power supply alternately. When performing communication, for example, it is conceivable to use RFID (Radio Frequency IDentification), NFC (Near Field Communication), or the like, which is an existing proximity wireless technology. In this case, at the time of communication, the power supply power is lower than that during power supply.

JP 2008-113519 A

  Conventionally, when communication is performed using NFC or the like, in the case of a tag or card, it is only necessary to supply power for operating the NFC IC. However, in an electronic device that receives power by communication such as NFC and non-contact power supply, a charging control IC for receiving power and controlling charging is required in addition to the NFC IC. Therefore, particularly when the battery of the electronic device is empty, power for operating the charging control IC and the NFC IC is required, and therefore, it is necessary to supply power that is larger than the power during normal NFC communication.

  Further, if a large amount of power is output to a card such as NFC, there is a possibility that the sensitivity will be affected by communication and the NFC IC may be damaged. Thus, when communicating using NFC etc., it is necessary to change the electric power which should be supplied by the communicating party.

  Accordingly, an object of the present invention is to realize a power feeding device that can communicate with both electronic devices that only perform communication and electronic devices that can receive both power through communication and contactless power feeding. To do.

The power feeding device according to the present invention is
First power supply means for supplying power in a contactless manner;
First communication means for performing communication by modulating the first power supply means;
Second power supply means for supplying larger power than the first power supply means;
Second communication means for communicating by modulating the second power supply means;
Having third power supply means for supplying larger power than the second power supply means;
When communicating with an electronic device capable of receiving power by the third power supply means, communicate with the second communication means,
When communicating with an electronic device that cannot receive power by the third power supply means, communicate with the first communication means,
Polling for device detection is performed by combining the first communication unit and the second communication unit.

  According to the present invention, in the power feeding device, it is possible to normally communicate with both an electronic device that only performs communication and an electronic device that can receive both power through communication and non-contact power feeding.

It is the figure which showed an example of the electric power feeding system in Example 1. FIG. 1 is a block diagram illustrating an example of a power feeding system in Embodiment 1. FIG. 6 is a flowchart illustrating an example of a device detection process performed by the power supply apparatus according to the first embodiment. 3 is a flowchart illustrating an example of a power supply control process performed by the power supply apparatus according to the first embodiment. 6 is a flowchart illustrating an example of command response processing performed by the electronic device according to the first exemplary embodiment. 10 is a flowchart illustrating an example of a device detection process performed by the power supply apparatus according to the second embodiment.

[Example 1]
Hereinafter, Example 1 of the present invention will be described in detail with reference to the drawings. The power supply system according to the first embodiment includes a power supply apparatus 100, an electronic device 200, and an NFC device 200a as illustrated in FIG. In the power supply system according to the first embodiment, for example, when the electronic device 200 is placed on the power supply apparatus 100 as illustrated in FIG. I do.

  In addition, when the distance between the power feeding apparatus 100 and the electronic device 200 is within a predetermined range, the electronic device 200 having the power receiving antenna 201 wirelessly outputs power output from the power feeding apparatus 100 via the power receiving antenna 201. Accept. Furthermore, the electronic device 200 charges the battery 210 attached to the electronic device 200 with the power received from the power supply apparatus 100 via the power receiving antenna 201. Further, when the NFC device 200a is placed on the power supply apparatus 100, the power supply apparatus 100 communicates wirelessly with the NFC device 200a via the power supply antenna 108.

  Further, when the distance between the power supply apparatus 100 and the electronic device 200 or the NFC device 200a does not exist within a predetermined range, even if the electronic device 200 or the NFC device 200a includes the power receiving antenna 201, the power supply is performed. Cannot communicate with device 100. Note that the predetermined range is a range in which the electronic device 200 or the NFC device 200a can perform communication with the power supplied from the power supply apparatus 100. Note that the power supply apparatus 100 can wirelessly supply power to a plurality of electronic devices in parallel.

  The electronic device 200 may be an imaging device such as a digital still camera, a camera-equipped mobile phone, or a digital video camera as long as it is an electronic device that operates with electric power supplied from the battery 210, and reproduces audio data and video data. It may be a playback device such as a player that performs the above. The electronic device 200 may be a moving device such as a car that is driven by electric power supplied from the battery 210. In addition, the electronic device 200 may be an electronic device that operates with electric power supplied from the power supply apparatus 100 when the battery 210 is not attached.

  FIG. 2 is a block diagram of a power supply system including the power supply apparatus 100 and the electronic device 200. As shown in FIG. 2, the power supply apparatus 100 includes an oscillator 101, a power transmission circuit 102, a matching circuit 103, a modulation / demodulation circuit 104, a CPU 105, a ROM 106, a RAM 107, a power supply antenna 108, a timer 109, a production unit 110, and a conversion unit 111. .

  The oscillator 101 controls the power transmission circuit 102 so as to convert the power supplied from the AC power source (not shown) to the power transmission circuit 102 via the conversion unit 111 into the power corresponding to the target value set by the CPU 105. Oscillates the frequency used for The oscillator 101 uses a crystal resonator or the like.

  The power transmission circuit 102 generates power to be supplied to the electronic device 200 via the feeding antenna 108 according to the power supplied from the conversion unit 111 and the frequency oscillated by the oscillator 101. The power transmission circuit 102 has an FET or the like inside, and supplies the electronic device 200 by controlling the current flowing between the source and drain terminals of the internal FET according to the frequency oscillated by the oscillator 101. To generate power for. Note that the power generated by the power transmission circuit 102 is supplied to the matching circuit 103.

  The power generated by the power transmission circuit 102 includes a first power, a second power, and a third power. The first power is power for the power supply apparatus 100 to supply a command for controlling the NFC device 200a to the NFC device 200a. The second power is power for the power supply apparatus 100 to supply a command for controlling the electronic device 200 to the electronic device 200. The third power is power that is supplied to the electronic device 200 when the power supply apparatus 100 supplies power to the electronic device 200. For example, the first power is 0.1 W to 1 W or less, and the second power is 2 W to 10 W.

  Note that the first power is lower than the second power, and the second power is lower than the third power. Note that when the power supply apparatus 100 supplies the first power to the NFC device 200a, the power supply apparatus 100 can transmit a command to the NFC device 200a via the power supply antenna 108.

  Note that when the power supply apparatus 100 supplies the second power to the electronic apparatus 200, the power supply apparatus 100 can transmit a command to the electronic apparatus 200 via the power supply antenna 108. However, when the power supply apparatus 100 supplies the second power to the electronic device 200, the power supply apparatus 100 cannot transmit a command to the electronic device 200 via the power supply antenna 108.

  The CPU 105 controls the power transmission circuit 102 so that the power to be supplied to the electronic device 200 is switched to any one of the first power, the second power, and the third power. The matching circuit 103 is a resonance circuit for performing resonance between the power supply antenna 108 and the power receiving antenna included in the power supply target device selected by the CPU 105 according to the frequency oscillated by the oscillator 101.

  The CPU 105 sets the frequency oscillated by the oscillator 101 to the resonance frequency f. Note that the resonance frequency f is a frequency at which the power feeding device 100 and a device that is a power feeding target of the power feeding device 100 perform resonance. Hereinafter, a frequency at which the power feeding device 100 and a device that is a power feeding target of the power feeding device 100 perform resonance is referred to as a “resonance frequency f”. The following formula (1) represents the resonance frequency f. L represents the inductance of the feeding antenna 108, and C represents the capacitance of the matching circuit 103.

  The resonance frequency f may be a commercial frequency of 50/60 Hz, may be 10 to several hundred kHz, or may be a frequency around 10 MHz. In a state where the frequency oscillated by the oscillator 101 is set to the resonance frequency f, the power generated by the power transmission circuit 102 is supplied to the feeding antenna 108 via the matching circuit 103.

  The modem circuit 104 modulates the power generated by the power transmission circuit 102 in accordance with a predetermined protocol in order to transmit a command for controlling the electronic device 200 to the electronic device 200. The predetermined protocol is a communication protocol based on ISO / IEC 18092 standard such as RFID (Radio Frequency IDentification). Further, the predetermined protocol may be a communication protocol compliant with the NFC (Near Field Communication) standard. The power generated by the power transmission circuit 102 is converted into a pulse signal by the modulation / demodulation circuit 104 as a command for communicating with the electronic device 200, and transmitted to the electronic device 200 via the power supply antenna 108.

  The pulse signal transmitted to the electronic device 200 is detected by the electronic device 200 as bit data including information “1” and information “0”. The command includes identification information for identifying a destination, a command code indicating an operation instructed by the command, and the like. Note that the CPU 105 can transmit the command only to the electronic device 200 by controlling the modulation / demodulation circuit 104 so as to change the identification information included in the command. Further, the CPU 105 can also transmit the command to the electronic device 200 and devices other than the electronic device 200 by controlling the modulation / demodulation circuit 104 so as to change the identification information included in the command.

  The modem circuit 104 converts the power generated by the power transmission circuit 102 into a pulse signal by ASK (Amplitude Shift Keying) modulation using amplitude displacement. ASK modulation is modulation using amplitude displacement, and is used for communication between an IC card and a card reader that communicates wirelessly with the IC card.

  The modem circuit 104 changes the amplitude of the power generated by the power transmission circuit 102 by switching an analog multiplier and a load resistor included in the modem circuit 104. As a result, the modem circuit 104 changes the power generated by the power transmission circuit 102 to a pulse signal. The pulse signal changed by the modulation / demodulation circuit 104 is supplied to the power feeding antenna 108 and transmitted to the electronic device 200 as a command. Further, the modulation / demodulation circuit 104 has an encoding circuit based on a predetermined encoding system.

  The modulation / demodulation circuit 104 encodes a response from the electronic device 200 to a command transmitted to the electronic device 200 and information transmitted from the electronic device 200 according to a change in the current flowing through the power feeding antenna 108 detected by the matching circuit 103. Demodulated by the circuit. Thus, the modem circuit 104 can receive a response to a command transmitted to the electronic device 200 by the load modulation method and information transmitted from the electronic device 200 from the electronic device 200. The modem circuit 104 transmits a command to the electronic device 200 in accordance with an instruction from the CPU 105.

  Further, when receiving a response or information from the electronic device 200, the modem circuit 104 demodulates the received response or information and supplies it to the CPU 105. The modulation / demodulation circuit 104 has a register for setting communication, and can be controlled by the CPU 105 to adjust the sensitivity during communication.

  When an AC power supply (not shown) and the power supply apparatus 100 are connected, the CPU 105 controls each unit of the power supply apparatus 100 with electric power supplied from the AC power supply (not shown) via the conversion unit 111. In addition, the CPU 105 controls the operation of each unit of the power supply apparatus 100 by executing a computer program stored in the ROM 106. The CPU 105 controls the power supplied to the electronic device 200 by controlling the power transmission circuit 102. Further, the CPU 105 transmits a command to the electronic device 200 by controlling the modulation / demodulation circuit 104.

  The ROM 106 stores information such as a computer program that controls the operation of each unit of the power supply apparatus 100 and parameters related to the operation of each unit. The ROM 106 records video data to be displayed on the display unit 113. The RAM 107 is a rewritable non-volatile memory, a computer program that temporarily controls the operation of each unit of the power supply apparatus 100, information such as parameters related to the operation of each unit, information received from the electronic device 200 by the modem circuit 104, and the like Record.

  The power feeding antenna 108 is an antenna for outputting the power generated by the power transmission circuit 102 to the outside. The power supply apparatus 100 supplies power to the electronic device 200 or the NFC device 200a via the power supply antenna 108, and transmits a command to the electronic device 200 or the NFC device 200a via the power supply antenna 108. In addition, the power supply apparatus 100 receives a command from the electronic device 200 or the NFC device 200a via the power supply antenna 108, a response corresponding to the command transmitted to the electronic device 200, and information transmitted from the electronic device 200 or the NFC device 200a. To do.

  The timer 109 measures the current time and the time related to operations and processes performed in each unit. A threshold for the time measured by the timer 109 is recorded in the ROM 106 in advance. The operation unit 110 provides a user interface for operating the power supply apparatus 100. The operation unit 110 includes a power button of the power supply apparatus 100, a mode switching button of the power supply apparatus 100, and the like, and each button includes a switch, a touch panel, and the like.

  The CPU 105 controls the power supply apparatus 100 in accordance with a user instruction input via the operation unit 110. Note that the operation unit 110 may control the power supply apparatus 100 in accordance with a remote control signal received from a remote controller (not shown). When the AC power supply (not shown) and the power supply apparatus 100 are connected, the conversion unit 111 converts AC power supplied from the AC power supply (not shown) into DC power, and converts the converted DC power to the entire power supply apparatus 100. Supply.

  Next, an example of the configuration of the electronic device 200 will be described with reference to FIG. A digital still camera is taken as an example of the electronic device 200, and will be described below. The electronic device 200 includes a power receiving antenna 201, a matching circuit 202, a rectifying / smoothing circuit 203, a modem circuit 204, a CPU 205, a ROM 206, a RAM 207, a power supply control unit 208, a charge control unit 209, a battery 210, and a timer 211. Furthermore, the electronic device 200 includes an operation unit 212 and an external power source 213.

  The power receiving antenna 201 is an antenna for receiving power supplied from the power supply apparatus 100. The electronic device 200 receives power from the power supply apparatus 100 via the power receiving antenna 201 and receives a command. Further, the electronic device 200 transmits a command for controlling the power feeding apparatus 100 via the power receiving antenna 201, a response corresponding to the command received from the power feeding apparatus 100, and predetermined information.

  The matching circuit 202 is a resonance circuit for performing impedance matching so that the power receiving antenna 201 resonates at the same frequency as the resonance frequency f of the power feeding apparatus 100. The matching circuit 202 includes a capacitor, a coil, a resistor, and the like, like the matching circuit 103. In the matching circuit 202, the power receiving antenna 201 resonates at the same frequency as the resonance frequency f of the power feeding apparatus 100. In addition, the matching circuit 202 supplies power received by the power receiving antenna 201 to the rectifying and smoothing circuit 203.

  The rectifying and smoothing circuit 203 removes commands and noise from the power received by the power receiving antenna 201 to generate DC power. Further, the rectifying / smoothing circuit 203 supplies the generated DC power to the power supply control unit 208. The rectifying / smoothing circuit 203 supplies the command removed from the power received by the power receiving antenna 201 to the modem circuit 204. Note that the rectifying / smoothing circuit 203 includes a rectifying diode and generates DC power by one of full-wave rectification and half-wave rectification. The DC power generated by the rectifying / smoothing circuit 203 is supplied to the power supply control unit 208.

  The modem circuit 204 analyzes the command supplied from the rectifying / smoothing circuit 203 in accordance with the power supply apparatus 100 and a predetermined communication protocol, and supplies the command analysis result to the CPU 205. The CPU 205 controls the modulation / demodulation circuit 204 to change the load included in the modulation / demodulation circuit 204 in order to transmit a command, a response to the command, and predetermined information to the power supply apparatus 100 from the power supply apparatus 100 to the electronic device 200. . When the load included in the modem circuit 204 changes, the current flowing through the feeding antenna 108 changes.

  Thereby, the power feeding apparatus 100 receives a command, a response to the command, and predetermined information transmitted from the electronic device 200 by detecting a change in the current flowing through the power feeding antenna 108. The CPU 205 determines which command the command received by the modulation / demodulation circuit 204 is based on the analysis result supplied from the modulation / demodulation circuit 204, and performs the processing and operation specified by the command code corresponding to the received command. In this way, the electronic device 200 is controlled. In addition, the CPU 205 controls the operation of each unit of the electronic device 200 by executing a computer program stored in the ROM 206.

  The ROM 206 stores information such as a computer program that controls the operation of each unit of the electronic device 200 and parameters related to the operation of each unit. In addition, the ROM 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 RAM 207 is a rewritable nonvolatile memory, and records a computer program that temporarily controls the operation of each unit of the electronic device 200, information such as parameters related to the operation of each unit, information transmitted from the power supply apparatus 100, and the like. The power supply control unit 208 includes a switching regulator and a linear regulator, and supplies DC power supplied from either the rectifying / smoothing circuit 203 or the external power supply 213 to the charging control unit 209 and the entire electronic device 200.

  When power is supplied from the power supply control unit 208, the charging control unit 209 charges the battery 210 according to the supplied power. Note that the charging control unit 209 charges the battery 210 by a constant voltage constant current method. In addition, the charging control unit 209 periodically detects information related to charging of the attached battery 210 and supplies the information to the CPU 205. Information relating to charging of the battery 210 is hereinafter referred to as “charging information”.

  The CPU 205 records charging information in the RAM 207. Note that the charging information may include information indicating whether or not the battery 210 is fully charged, in addition to the remaining capacity information indicating the remaining capacity of the battery 210. Information indicating the time elapsed since the start of charging may be included. The charging information includes information indicating that the charging control unit 209 is charging the battery 210 according to the constant voltage control, and the charging control unit 209 is charging the battery 210 according to the constant current control. May be included.

  The charging information includes information indicating that the charging control unit 209 performs software charging control and trickle charging on the battery 210, and that the charging control unit 209 performs rapid charging on the battery 210. The information etc. which are shown are included. Further, the charging information includes power information necessary for the electronic device 200 to charge the battery 210 and information such as the temperature state of the battery 210.

  The battery 210 is a battery that can be attached to and detached from the electronic device 200. The battery 210 is a rechargeable secondary battery, such as a lithium ion battery. The battery 210 can supply power to each part of the electronic device 200.

  The timer 211 measures the time related to the current time and operations and processes performed in each unit. A threshold for the time measured by the timer 211 is recorded in the ROM 206 in advance. The operation unit 212 provides a user interface for operating the electronic device 200. The operation unit 212 includes a power button for operating 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 operation unit 212. Note that the operation unit 212 may control the electronic device 200 according to a remote control signal received from a remote controller (not shown). The external power source 213 is a power source that is supplied by changing AC from AC power to DC. Note that the power feeding antenna 108 and the power receiving antenna 201 may be a helical antenna, a loop antenna, or a planar antenna such as a meander line antenna.

  The NFC device 200a includes the power receiving antenna 201, the matching circuit 202, the modulation / demodulation circuit 204, the CPU 205, the ROM 206, and the RAM 207 of the electronic device 200, and does not have a function of charging the battery 210. Note that the configuration of the NFC device 200a is the same as the communication function of the electronic device 200, and is therefore omitted.

  In the first embodiment, the process performed by the power supply apparatus 100 is also applicable to a system in which the power supply apparatus 100 supplies power to the electronic device 200 wirelessly by electromagnetic field coupling. Similarly, in the first embodiment, the processing performed by the electronic device 200 can be applied to a system in which the power supply apparatus 100 supplies power to the electronic device 200 wirelessly by electromagnetic coupling.

  In addition, the present invention is also applied to a system in which an electrode is provided in the power feeding device 100 as the power feeding antenna 108 and an electrode is provided in the electronic device 200 as the power receiving antenna 201 so that the power feeding device 100 supplies power to the electronic device 200 by electric field coupling. Can be applied. Further, even in a system in which the power supply apparatus 100 supplies power to the electronic device 200 wirelessly by electromagnetic induction, the process performed by the power supply apparatus 100 and the process performed by the electronic device 200 can be applied.

  In the first embodiment, the power supply apparatus 100 transmits power to the electronic device 200 wirelessly, and the electronic apparatus 200 receives power from the power supply apparatus 100 wirelessly. However, “wireless” may be rephrased as “non-contact” or “non-contact”.

(Equipment detection processing of power supply apparatus 100)
The power supply control process performed by the power supply apparatus 100 will be described with reference to the flowchart of FIG. The process illustrated in FIG. 3 is a process performed by the power supply apparatus 100 when the power supply apparatus 100 is turned on and the power supply apparatus 100 enters a state of communication.

  In S <b> 301, the CPU 105 determines whether or not the set time of the timer 109 recorded in the RAM 107 has elapsed. When the set time of the timer 109 has elapsed (YES in S301), the CPU 105 advances this flowchart from S301 to S302. When the set time of the timer 109 has not elapsed (NO in S301), the CPU 105 continues the process of S301 in this flowchart.

  In S302, the CPU 105 determines whether or not the priority device setting value set in the RAM 107 is a setting that prioritizes detection of the NFC device 200a. When the priority device setting value set in the RAM 107 is a setting that prioritizes the detection of the NFC device 200a (YES in S302), the CPU 105 advances this flowchart from S302 to S303. When the priority device setting value set in the RAM 107 is a setting for giving priority to the detection of the electronic device 200 (NO in S302), the CPU 105 advances this flowchart from S302 to S307.

  The priority device setting value is expressed as a priority for indicating how much priority is given to the detection of the NFC device 200a. For example, the NFC device 200a highest priority (5), the NFC device 200a priority (4), the same priority (3), the electronic device 200 priority (2), and the electronic device 200 highest priority (1) may be indicated. Further, when the device with a high communication frequency is the electronic device 200 from the past communication history information stored in the RAM 107, the priority device setting value is set to increase the priority of the electronic device 200, and the device with the high communication frequency is an NFC device. If it is 200a, the priority of the NFC device 200a is increased. Further, the priority device setting value may be changed according to a command notified by the user via the operation unit 110.

  In step S <b> 303, the CPU 105 stores a value of POL_A, which is the number of polling times for continuously detecting devices that communicate with the first power, such as the NFC device 200 a, in the RAM 107. The CPU 105 determines and sets the value of the polling count POL_A from the priority device setting value. Also, the value of the polling count POL_A is increased when the device that communicated last time is NFC 200a. The CPU 105 advances this flowchart from S303 to S304.

  In S <b> 304, the CPU 105 compares the polling count POL_A to the device that communicates with the first power such as the NFC device 200 a with the X value stored in the RAM 107. The X value is a value added each time polling is performed on a device that communicates with the first power such as the NFC device 200a. If the polling count POL_A to the device that communicates with the first power is smaller than the X value stored in the RAM 107 (YES in S304), the CPU 105 advances this flowchart from S304 to S305. When the polling count POL_A to the device that communicates with the first power is larger than the X value stored in the RAM 107 (NO in S304), the CPU 105 advances this flowchart from S304 to S306.

  In step S <b> 305, the CPU 105 sets the communication power setting value P stored in the RAM 107 to a value for outputting the first power. The CPU 105 increments the X value stored in the RAM 107 and overwrites the X value in the RAM 107. The CPU 105 advances this flowchart from S305 to S312.

  In S <b> 306, the CPU 105 sets the communication power setting value P stored in the RAM 107 to a value for outputting the second power. In addition, the CPU 105 sets the X value stored in the RAM 107 to 0 and overwrites the X value in the RAM 107. The CPU 105 advances this flowchart from S305 to S312.

  In step S <b> 307, the CPU 105 determines from the communication history information stored in the ROM 107 whether or not the device that communicated last time was a device that communicates with the first power such as NFC 200 a. CPU105 advances this flowchart from S307 to S303, when the apparatus which communicated last time is an apparatus which communicates by 1st electric power, such as NFC200a (YES of S307). CPU105 advances this flowchart from S307 to S308, when the apparatus which communicated last time is not apparatuses which communicate by 1st electric power, such as NFC200a (NO of S307).

  In step S <b> 308, the CPU 105 stores a value of POL_B, which is the number of polling times for continuously detecting devices that communicate with the second power, such as the electronic device 200, in the RAM 107. The CPU 105 determines and sets the value of the polling count POL_B from the priority device setting value. The CPU 105 advances this flowchart from S308 to S309.

  In step S <b> 309, the CPU 105 compares the polling count POL_B to the device that communicates with the second power such as the electronic device 200 with the Y value stored in the RAM 107. The Y value is a value that is added every time polling is performed on a device that communicates with the second power such as the electronic device 200. When the polling count POL_B to the device that communicates with the second power is smaller than the Y value stored in the RAM 107 (YES in S309), the CPU 105 advances this flowchart from S309 to S310. When the polling count POL_B to the device communicating with the second power is larger than the Y value stored in the RAM 107 (NO in S309), the CPU 105 advances this flowchart from S309 to S311.

  In S <b> 310, the CPU 105 sets the communication power setting value P stored in the RAM 107 to a value for outputting the second power. The CPU 105 increments the Y value stored in the RAM 107 and overwrites the Y value in the RAM 107. The CPU 105 advances this flowchart from S310 to S312.

  In S <b> 311, the CPU 105 sets the communication power setting value P stored in the RAM 107 to a value for outputting the first power. In addition, the CPU 105 sets the Y value stored in the RAM 107 to 0 and overwrites the Y value in the RAM 107. The CPU 105 advances this flowchart from S311 to S312.

  In S <b> 312, the CPU 105 changes a communication setting register value set in the modem circuit 104. For example, the CPU 105 changes the setting depending on whether the power in communication is the first power or the second power. Specifically, the filtering threshold for noise removal at the time of communication or the change of the amplifier gain is performed according to the power level. Further, in order to communicate with a different device, the register value for communication may be changed every time the above-described X value or Y value increases. The CPU 105 changes the communication register of the modem circuit 104, and advances this flowchart from S312 to S313.

  In S313, the CPU 105 controls the oscillator 101, the power transmission circuit 102, and the matching circuit 103 so as to output the power determined by the power setting value P during communication in order to detect the electronic device 200 or the NFC device 200a. The CPU 105 superimposes on the output power and transmits the first command for detecting the device via the antenna 108 with ASK modulation performed by the modulation / demodulation circuit 104. The CPU 105 advances this flowchart from S313 to S314.

  In S <b> 314, the CPU 105 receives the load modulation signal via the modulation / demodulation circuit 104 and stores the demodulated data in the RAM 107. The CPU 105 determines whether there is any device that can communicate with the response to the first command stored in the RAM 107. If there is a response to the first command (YES in S314), the CPU 105 advances this flowchart from S314 to S315. If there is no response to the first command (NO in S314), the CPU 105 returns this flowchart from S314 to S301.

  In S315, the CPU 105 performs power supply control processing. The power supply control process will be described later with reference to FIG. The CPU 105 ends the power supply control process of S315 and ends the process in this flowchart.

  The power supply control process performed by the power supply apparatus 100 will be described with reference to the flowchart of FIG. The process illustrated in FIG. 4 is a process performed by the power supply apparatus 100 when the power supply apparatus 100 is on and can communicate with the electronic device 200.

  In step S <b> 401, the CPU 105 determines whether the electronic device 200 is based on response data for the first command stored in the RAM 107. If the CPU 105 determines that the electronic device 200 is based on the response data to the first command (YES in S401), the CPU 105 advances the process from S401 to S402. If it is determined from the response data to the first command that the electronic device 200 is not the electronic device 200 (NO in S401), the CPU 105 advances this flowchart from S401 to S411.

  In step S <b> 402, the CPU 105 transmits a second command for confirming whether the electronic device 200 is operating by supplying power from the external power source 213. The CPU 105 controls the oscillator 101, the power transmission circuit 102, and the matching circuit 103 so as to output the power determined by the power setting value P during communication. Further, the CPU 105 superimposes the output power on the second command, and ASK-modulates the modulation / demodulation circuit 104 to transmit the second command via the antenna 108. The CPU 105 advances this flowchart from S402 to S403.

  In step S <b> 403, the CPU 105 receives the load modulation signal via the modem circuit 104 and stores the demodulated data in the RAM 107. The CPU 105 determines whether the electronic device 200 is operating with power supplied from the external power supply 213 based on a response to the second command stored in the RAM 107. When the electronic device 200 is operating with power supplied from the external power supply 213 (YES in S403), the CPU 105 advances the flowchart from S403 to S404. When the electronic device 200 is not operating by receiving power supply from the external power supply 213 (NO in S403), the CPU 105 advances this flowchart from S403 to S407.

  In S <b> 404, the CPU 105 sets the power setting value P for communication stored in the RAM 107 to a value for outputting the second power. The CPU 105 controls the oscillator 101, the power transmission circuit 102, and the matching circuit 103 so as to output the second power that is the power determined by the power setting value P during communication. The CPU 105 advances this flowchart from S404 to S405.

  In step S <b> 405, the CPU 105 performs ASK modulation in the modulation / demodulation circuit 104 and transmits it via the antenna 108 in order to issue a third command in order to acquire the charging information of the battery 210 of the electronic device 200. The CPU 105 advances this flowchart from S405 to S406.

  In step S <b> 406, the CPU 105 receives the load modulation signal via the modulation / demodulation circuit 104 and stores the demodulated data in the RAM 107. The CPU 105 determines whether or not the battery 210 of the electronic device 200 is fully charged based on a response to the third command stored in the RAM 107. If the battery 210 of the electronic device 200 is fully charged (YES in S406), the CPU 105 advances this flowchart from S406 to S412. If the battery 210 of the electronic device 200 is not fully charged (NO in S406), the CPU 105 returns this flowchart from S406 to S403.

  In step S <b> 407, the CPU 105 sets the communication power setting value P stored in the RAM 107 to a value for outputting the first power. The CPU 105 controls the oscillator 101, the power transmission circuit 102, and the matching circuit 103 so as to output the first power that is the power determined by the power setting value P during communication. The CPU 105 advances this flowchart from S407 to S408.

  In S <b> 408, the CPU 105 performs the same process as S <b> 405, and advances this flowchart from S <b> 408 to S <b> 409. In step S <b> 409, the CPU 105 receives the load modulation signal via the modulation / demodulation circuit 104 and stores the demodulated data in the RAM 107. The CPU 105 determines whether or not the battery 210 of the electronic device 200 is fully charged based on a response to the third command stored in the RAM 107. If the battery 210 of the electronic device 200 is in a fully charged state (YES in S409), the CPU 105 advances this flowchart from S409 to S412. If the battery 210 of the electronic device 200 is not fully charged (NO in S409), the CPU 105 returns this flowchart from S409 to S410.

  In S <b> 410, the CPU 105 controls the power transmission circuit 102 and the matching circuit 103 and transmits the third power via the power supply antenna 108. The CPU 105 continues power supply according to the power supply time stored in the RAM 107 and set in the timer 109. The CPU 105 returns the process from S410 to S403 after the power supply is completed.

  In S411, the CPU 105 controls the modulation / demodulation circuit 104 to communicate with the NFC device 200a. NFC communication processing is performed using an appropriate protocol depending on the type of the NFC device 200a. After the NFC process is completed, the CPU 105 advances this flowchart from S411 to S412.

  In step S <b> 412, the CPU 105 performs ASK modulation in the modulation / demodulation circuit 104 and transmits it via the antenna 108 to issue a fourth command for notifying the electronic device 200 of the end of power supply and communication. The fourth command is a command that does not need to receive a response. The CPU 105 advances this flowchart from S412 to S413. In step S413, the CPU 105 controls the power transmission circuit 102 to stop power transmission. The CPU 105 ends the process of this flowchart in S413.

(Command reception processing of electronic device 200)
In the first embodiment, command reception processing performed by the electronic device 200 will be described with reference to the flowchart of FIG. The command receiving process can be realized by the CPU 205 executing a computer program stored in the ROM 206.

  The command reception process illustrated in FIG. 5 is a process performed by the electronic device 200. When the command reception processing is performed by the CPU 205, it is assumed that the first power for performing communication from the power supply apparatus 100 is supplied to the electronic device 200. Further, the command reception process shown in FIG. 5 may be performed periodically.

  In step S <b> 501, the CPU 205 determines whether the modem circuit 204 has received a command from the power supply apparatus 100. If the CPU 205 determines that the modem circuit 204 has received a command from the power supply apparatus 100 (YES in S501), the process proceeds from S501 to S502. If the CPU 205 determines that the modem circuit 204 has not received a command from the power supply apparatus 100 (NO in S501), the flowchart continues the processing of S501.

  In step S <b> 502, the CPU 205 controls the modem circuit 204 so that the modem circuit 204 analyzes the command received from the power supply apparatus 100. The CPU 205 stores the analyzed command in the RAM 207. If the command stored in the RAM 207 is the first command for detecting a device (YES in S502), the CPU 205 advances this flowchart from S502 to S503. If the command stored in the RAM 207 is not the first command for detecting a device (NO in S502), the CPU 205 advances this flowchart from S502 to S504.

  In step S503, the CPU 205 controls the modulation / demodulation circuit 204 to transmit a response signal indicating that the first command has been normally received. The CPU 205 advances this flowchart from S503 to S505. In step S <b> 504, the CPU 205 controls the modulation / demodulation circuit 204 to transmit a response signal for notifying an abnormality to a command other than the first command. The CPU 205 returns this flowchart from S504 to S501.

  In step S <b> 505, the CPU 205 controls the modem circuit 204 so that the modem circuit 204 analyzes the command received from the power supply apparatus 100. The CPU 205 stores the analyzed command in the RAM 207. If the command stored in the RAM 207 is the second command for acquiring whether or not the command stored in the RAM 207 receives the power supply device from the external power supply 213 (YES in S505), the CPU 205 advances the process from S505 to S506. . If the command stored in the RAM 207 is not the second command (NO in S505), the CPU 205 advances this flowchart from S505 to S508.

  In step S <b> 506, the CPU 205 acquires information about whether or not it is operating by power supply from the external power supply 213 from the power supply control unit 208 and stores it in the RAM 207. The CPU 205 advances this flowchart from S506 to S507. In step S507, the CPU 205 transmits a response signal for the second or third command. The CPU 205 controls the modulation / demodulation circuit 204 to transmit the information acquired in S506 or S509 as a response signal, and returns this flowchart from S507 to S505.

  In step S <b> 508, the CPU 205 controls the modem circuit 204 so that the modem circuit 204 analyzes the command received from the power supply apparatus 100. The CPU 205 stores the analyzed command in the RAM 207. If the command stored in the RAM 207 is the third command for acquiring the charging information of the battery 210 (YES in S508), the CPU 205 advances this flowchart from S508 to S509. If the command stored in the RAM 207 is not the third command (NO in S508), the CPU 205 advances this flowchart from S508 to S510.

  In step S <b> 509, the CPU 205 acquires charging information of the battery 210 from the charging control unit 209 and stores it in the RAM 207. The CPU 205 advances this flowchart from S509 to S507. In step S <b> 510, the CPU 205 controls the modem circuit 204 so that the modem circuit 204 analyzes the command received from the power supply apparatus 100. The CPU 205 stores the analyzed command in the RAM 207. If the command stored in the RAM 207 is the fourth command for notifying the end of power supply and communication (YES in S510), the CPU 205 ends this flowchart in S510.

  If the command stored in the RAM 207 is not the fourth command (NO in S510), the CPU 205 advances this flowchart from S510 to S511. In step S511, the CPU 205 controls the modem circuit 204 to transmit an error response signal. The CPU 205 returns the process of this flowchart from S511 to S505.

  As described above, the power supply apparatus 100 according to the first embodiment can perform device detection for both the electronic device 200 and the NFC device 200a by controlling transmission power in device detection polling.

[Example 2]
Detect by change of SWR. Hereinafter, Example 2 of the present invention will be described in detail with reference to the drawings. In the second embodiment, the description of the parts common to the first embodiment will be omitted, and the parts different from the first embodiment will be described. As in the first embodiment, the power feeding system according to the second embodiment includes a power feeding device 100, an electronic device 200, and an NFC device 200a as illustrated in FIG. However, the power supply apparatus 100 in the present embodiment can detect the reflected power in the matching circuit 103.

  The matching circuit 103 detects information indicating the amplitude voltage V1 of the traveling wave of power output from the power supply antenna 106 and information indicating the amplitude voltage V2 of the reflected wave of power output from the power supply antenna 106. Information indicating the amplitude voltage V1 and information indicating the amplitude voltage V2 detected by the matching circuit 103 is supplied to the CPU 105. The CPU 105 records information indicating the amplitude voltage V <b> 1 and information indicating the amplitude voltage V <b> 2 supplied from the matching circuit 103 in the RAM 107. The CPU 105 obtains the voltage reflection coefficient ρ from the amplitude voltage V1 of the traveling wave and the amplitude voltage V2 of the reflected wave.

  Further, the CPU 107 calculates a voltage standing wave ratio VSWR (Voltage Standing Wave Ratio) based on the voltage reflection coefficient ρ. The voltage standing wave ratio VSWR is a value indicating a relationship between a traveling wave of power output from the power feeding antenna 108 and a reflected wave of power output from the power feeding antenna 106. The closer the value of the voltage standing wave ratio VSWR is to 1, the smaller the reflected power, the less the loss of power supplied from the power supply apparatus 100 to an external electronic device, and the better the efficiency. The following formula (2) represents the voltage reflection coefficient ρ.

  The following mathematical formula (3) represents the voltage standing wave ratio VSWR.

  Hereinafter, the voltage standing wave ratio VSWR is referred to as “VSWR”. The CPU 105 determines that there is a foreign object in the vicinity of the power supply apparatus 100 when the calculated VSWR changes rapidly.

  In the present embodiment, device detection processing performed by the power supply apparatus 100 will be described with reference to the flowchart of FIG. The process illustrated in FIG. 6 is a process performed by the power supply apparatus 100 when the power supply apparatus 100 is powered on and can communicate with the electronic device 200.

  In step S <b> 601, the CPU 105 determines whether the set time of the timer 109 recorded in the RAM 107 has elapsed. When the set time of the timer 109 has elapsed (YES in S601), the CPU 105 advances this flowchart from S601 to S602. When the set time of the timer 109 has not elapsed (NO in S601), the CPU 105 continues the process of S601 in this flowchart.

  In step S <b> 602, the CPU 105 sets the communication power setting value P stored in the RAM 107 to a value for outputting the first power. The CPU 105 advances this flowchart from S602 to S603. In step S <b> 603, the CPU 105 changes the communication setting register value set in the modem circuit 104 to the first power setting. The CPU 105 changes the communication register of the modem circuit 104, and advances this flowchart from S603 to S604.

  In step S <b> 604, the CPU 105 detects the electronic device 200 or the NFC device 200 a by causing the oscillator 101, the power transmission circuit 102, and the matching circuit 103 to output the first power determined by the power setting value P during communication. Control. The CPU 105 superimposes on the output power and transmits the first command for detecting the device via the antenna 108 with ASK modulation performed by the modulation / demodulation circuit 104. The CPU 105 advances this flowchart from S604 to S605.

  In step S <b> 605, the CPU 105 receives the load modulation signal via the modulation / demodulation circuit 104 and stores the demodulated data in the RAM 107. The CPU 105 determines whether there is any device that can communicate with the response to the first command stored in the RAM 107. If there is a response to the first command (YES in S605), the CPU 105 advances this flowchart from S605 to S611. If there is no response to the first command (NO in S605), the CPU 105 advances this flowchart from S605 to S606.

  In step S <b> 606, the CPU 105 acquires the traveling wave amplitude voltage V <b> 1 and the reflected wave amplitude voltage V <b> 2 from the matching circuit 103, calculates the VSWR value, and stores them in the RAM 107. The CPU 105 determines whether the calculated VSWR value has changed from the previously measured value. If the VSWR has changed (YES in S606), the CPU 105 advances this flowchart from S606 to S607. If the VSWR has not changed (NO in S606), the CPU 105 returns the process from S606 to S601.

  In step S <b> 607, the CPU 105 sets the communication power setting value P stored in the RAM 107 to a value for outputting the second power. The CPU 105 controls the oscillator 101, the power transmission circuit 102, and the matching circuit 103 so as to output the second power that is the power determined by the power setting value P during communication. The CPU 105 advances this flowchart from S607 to S608.

  In step S <b> 608, the CPU 105 changes the communication setting register value set in the modulation / demodulation circuit 104 to the second power. The CPU 105 changes the communication register of the modulation / demodulation circuit 104, and advances this flowchart from S608 to S609.

  In step S609, the CPU 105 detects the electronic device 200 or the NFC device 200a by causing the oscillator 101, the power transmission circuit 102, and the matching circuit 103 to output the second power determined by the power setting value P during communication. Control. The CPU 105 superimposes on the output power and transmits the first command for detecting the device via the antenna 108 with ASK modulation performed by the modulation / demodulation circuit 104. The CPU 105 advances this flowchart from S609 to S610.

  In step S <b> 610, the CPU 105 receives the load modulation signal via the modulation / demodulation circuit 104 and stores the demodulated data in the RAM 107. The CPU 105 determines whether there is any device that can communicate with the response to the first command stored in the RAM 107. If there is a response to the first command (YES in S610), the CPU 105 advances this flowchart from S610 to S611. If there is no response to the first command (NO in S610), the CPU 105 returns the process from S610 to S601.

  In step S611, the CPU 105 performs power supply control processing. Regarding the power supply control process, the process described above with reference to FIG. The CPU 105 ends the power supply control process in S611 and ends the process in this flowchart.

  The processing flow of the electronic device 200 in the present embodiment is the same as the processing described in Embodiment 1 with reference to FIG.

  As described above, the electronic device 200 according to the second embodiment performs the device detection polling with the first power, and detects the change of the object when the device cannot be detected by the communication with the first power to detect the second change. By switching to this power, it becomes possible to detect the electronic device 200 and the NFC device 200a. In the second embodiment, processes that are the same as those in the first embodiment have the same effects as those in the first embodiment.

(Other examples)
The power supply apparatus 100 according to the present invention is not limited to the power supply apparatus 100 described in the first and second embodiments. Also, the electronic device 200 according to the present invention is not limited to the electronic device 200 described in the first and second embodiments. For example, the power supply apparatus 100 and the electronic device 200 according to the present invention can be realized by a system including a plurality of apparatuses.

  The various processes and functions described in the first and second embodiments can also be realized by a computer program. In this case, the computer program according to the present invention can be executed by a computer (including a CPU and the like), and realizes various functions described in the first embodiment.

  Needless to say, the computer program according to the present invention may realize various processes and functions described in the first embodiment by using an OS (Operating System) running on the computer.

  The computer program according to the present invention is read from a computer-readable recording medium and executed by the computer. As the computer-readable recording medium, a hard disk device, an optical disk, a CD-ROM, a CD-R, a memory card, a ROM, or the like can be used. The computer program according to the present invention may be provided from an external device to a computer via a communication interface and executed by the computer.

100 Power Supply Device 200 Electronic Device 200a NFC Device

Claims (9)

First power supply means for supplying power in a contactless manner;
First communication means for performing communication by modulating the first power supply means;
Second power supply means for supplying larger power than the first power supply means;
Second communication means for communicating by modulating the second power supply means;
Having third power supply means for supplying larger power than the second power supply means;
When communicating with an electronic device capable of receiving power by the third power supply means, communicate with the second communication means,
When communicating with an electronic device that cannot receive power by the third power supply means, communicate with the first communication means,
A power supply apparatus that performs polling for device detection by combining the first communication unit and the second communication unit. The power supply device according to claim 1,
When polling a combination of the first communication means and the second communication means,
A power supply apparatus that increases the communication frequency of the first communication means. The power supply device according to claim 1 or 2,
Having past detection device recording means for storing electronic devices communicated in the past;
When polling a combination of the first communication means and the second communication means,
If the electronic device detected by the past detection device recording means is an electronic device communicating with the first communication means, increase the communication frequency by the first communication means,
If the electronic device detected by the past detection device recording means is an electronic device that communicates with the second communication means, the frequency of communication by the second communication means is increased. The power supply device according to claim 1,
When polling a combination of the first communication means and the second communication means,
In the electronic device detected by the past detection device recording means, when the electronic device capable of receiving the power from the third power supply means is communicable by the first communication means,
A power supply apparatus that increases communication frequency in the first communication means. First power supply means for supplying power in a contactless manner;
First communication means for performing communication by modulating the first power supply means;
Second power supply means for supplying larger power than the first power supply means;
Second communication means for communicating by modulating the second power supply means;
Having third power supply means for supplying larger power than the second power supply means;
When communicating with an electronic device capable of receiving power by the third power supply means, communicate with the second communication means,
When communicating with an electronic device that cannot receive power by the third power supply means, communicate with the first communication means,
Having a device detection means for detecting that the device has been placed;
Polling by the first communication means;
When it is detected that the device is placed by the device detection means and the first communication means cannot communicate with the electronic device,
A power supply apparatus that switches to the second communication means. The power supply device according to claim 5,
The power supply apparatus, wherein the device detection means detects a change in VSWR. The power supply device according to any one of claims 1 to 5,
In the first communication means, a communication adjustment register for adjusting communication sensitivity is provided.
The power supply apparatus, wherein communication sensitivity is changed by the communication adjustment register for each communication by the first communication unit. The power supply device according to any one of claims 1 to 5,
The electronic device is detected by the second communication unit, and has a power reception availability determination unit that determines whether or not the electronic device can receive power from the third power supply unit. A power supply apparatus that supplies power to an electronic device by a third power supply unit. The power supply device according to any one of claims 1 to 5,
Determining whether the electronic device is operated by an external power supply by the second communication means;
When the electronic device is operating with an external power supply,
A power supply apparatus that changes from the second communication means to the first communication means.