JP2019198188A - Wireless power transmission system and communication method of wireless power transmission system - Google Patents

Abstract

To provide a wireless power transmission system capable of selecting a power reception device whose connection target is a power supply device in a predetermined order.SOLUTION: A wireless power transmission system according to one embodiment includes a power supply device and a power reception device. The power supply device includes a first radio unit for wirelessly communicating with the power reception device, a first processor for controlling the first radio unit and an inverter, and a first storage device for storing a current processing value and a next processing value. The power reception device includes a second radio unit for wirelessly communicating with the first radio unit included in the power supply device, a second processor for controlling the second radio unit, and a second storage device for storing a preset processing number. The second processor transmits a processing number to the power supply device on activating due to power supply from the power supply device, and the first processor connects to the power reception device if the processing number corresponds to a current processing value on receiving the processing number from the power reception device.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a wireless power transmission system and a communication method of the wireless power transmission system.

  In recent years, wireless power transmission systems that transmit power wirelessly from a power feeding device to a power receiving device have become widespread. In a wireless power transmission system, a power feeding device feeds power wirelessly to a power receiving device that has entered a predetermined power feeding range. The power receiving apparatus operates with electric power received from the power supply apparatus.

  Conventionally, as a method for stabilizing the power reception voltage of the power reception device, a method of feeding back the power reception voltage of the power reception device to the power supply device by wireless communication is known. The power receiving voltage of the power receiving device can be stabilized by controlling the power feeding power based on the power receiving voltage fed back by the power feeding device.

  When a plurality of power receiving devices enter the power supply range, if the power supplying device wirelessly communicates with each power receiving device alternately, the feedback interval from each power receiving device becomes wide, and therefore the power receiving voltage of all the power receiving devices may become unstable. There is. For this reason, when a plurality of power reception devices enter the power supply range, the power supply device selects one power reception device to be connected, wirelessly communicates with the power reception device, and based on the power reception voltage of the power reception device. It is preferable to control the power supply. Thereby, the power receiving voltage of the selected power receiving apparatus can be stabilized.

  As a method for selecting one power receiving device from among a plurality of power receiving devices that have entered the power supply range, a method using the priority of each power receiving device has been proposed. The priority is calculated based on, for example, the strength of a radio signal (received signal strength) received by the power feeding device from the power receiving device.

Japanese Patent Laying-Open No. 2015-089154

  However, in the selection method using the priority, there is a problem that the power feeding device cannot select the power receiving device (power receiving device that performs wireless communication) to be connected in a desired order.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a wireless power transmission system in which a power receiving apparatus can select power receiving apparatuses to be connected in a predetermined order.

  A wireless power transmission system according to an embodiment is a wireless power transmission system including a power feeding device and a power receiving device, wherein the power feeding device wirelessly transmits power, an inverter that drives the power feeding coil, A first wireless unit that wirelessly communicates with the power receiving device; a first processor that controls the first wireless unit and the inverter; and a first storage device that stores a current processing value and a next processing value. The power receiving device includes a power receiving coil that wirelessly receives power from the power feeding coil of the power feeding device, a second wireless unit that wirelessly communicates with the first wireless unit included in the power feeding device, and A second processor that controls the second wireless unit; and a second storage device that stores a preset processing number; When the processor starts up by power feeding from the power feeding device, the processing number is transmitted to the power feeding device, and when the first processor receives the processing number from the power receiving device, the processing number and the current Is connected to the power receiving apparatus.

  According to each embodiment of the present invention, it is possible to provide a wireless power transmission system in which a power receiving apparatus can select a power receiving apparatus to be connected in a predetermined order.

The figure which shows an example of the hardware constitutions of a wireless power transmission system. The figure which shows an example of the hardware constitutions of a control circuit. The block diagram which shows an example of the hardware constitutions of a wireless power transmission system. 6 is a flowchart illustrating an example of operation of the power receiving device. It is a flowchart which shows an example of operation | movement of an electric power feeder. The figure explaining the specific example of operation | movement of a wireless power transmission system. 6 is a flowchart illustrating an example of operation of the power receiving device. 6 is a flowchart illustrating an example of the operation of the power feeding apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, regarding the description of the specification and the drawings according to each embodiment, constituent elements having substantially the same functional configuration are denoted by the same reference numerals and overlapping description is omitted.

<First Embodiment>
A wireless power transmission system S according to the first embodiment will be described with reference to FIGS. The wireless power transmission system S according to the present embodiment is a system in which the power feeding device 1 wirelessly transmits power to the power receiving device 2. As a power transmission system of the wireless power transmission system S, there are a system in which electric power is converted into an electromagnetic wave (microwave) and power is supplied, a system using a resonance phenomenon of electric field coupling, and a system using magnetic field coupling. Hereinafter, a case where the power transmission method is a magnetic field coupling method will be described as an example.

  FIG. 1 is a diagram illustrating an example of a hardware configuration of the wireless power transmission system S. As illustrated in FIG. As shown in FIG. 1, the wireless power transmission system S includes a power feeding device 1 and a power receiving device 2. Hereinafter, the configurations of the power feeding side and the power receiving side will be described.

  The power supply device 1 on the power supply side includes a DC power supply 18, a control circuit 11, an inverter circuit 12, a power supply coil L 1, an initial voltage control circuit 13, a wireless module M 1, a step-down circuit Re 1, an operation unit 19, and a notification unit 10. Composed.

  The control circuit 11 generates gate signals G1 to G4 based on signals output from the initial voltage control circuit 13 and the wireless module M1, and controls the inverter circuit 12. The gate signals G1 to G4 are drive control signals for controlling the inverter circuit 12. The power supply terminal VDC of the control circuit 11 is connected to the direct current power supply 18, and the control circuit 11 operates when the direct current voltage Vdc is applied. The control circuit 11 applies a predetermined constant voltage Vreg to the initial voltage control circuit 13 from the constant voltage terminal VREG. The control circuit 11 generates gate signals G1 to G4 so as to variably control the on-duty of the pulse power based on the rectified voltage information received by the wireless module M1, and controls the inverter circuit 12.

  The inverter circuit 12 includes, for example, a P-type MOSFET (Metal Oxide Semiconductor Field Effect Transistor) (hereinafter referred to as “PMOS”) (Q1, Q2) and an N-type MOSFET (hereinafter referred to as “NMOS”) (Q3, Q4). ), And outputs pulse power for driving at the resonance frequency on the power receiving device 2 side to the feeding coil L1. The inverter circuit 12 is connected to a DC power source 18 and operates by applying a DC voltage Vdc. The inverter circuit 12 applies a rectangular wave voltage to the feeding coil L1, and drives the feeding coil L1. A triangular wave (sawtooth) current flows through the feeding coil L <b> 1 and wirelessly transmits power to the power receiving device 2. Note that the inverter circuit 12 may be composed entirely of NMOS.

  The initial voltage control circuit 13 includes an initial voltage setting circuit 14 that sets an initial voltage, and an initial voltage setting cancellation circuit 15 that cancels the setting of the initial voltage. Specifically, the initial voltage setting circuit 14 includes voltage dividing resistors R1 and R2. The initial voltage setting release circuit 15 includes a transistor (bipolar transistor) Q5, and has a function of dropping the node of the initial voltage, which is a connection point of the voltage dividing resistors R1 and R2, to the ground potential. The initial voltage control circuit 13 operates by applying a predetermined constant voltage Vreg from the constant voltage terminal VREG of the control circuit 11, and outputs an initial drive control signal Ss to the terminal FB1. The control circuit 11 sets an initial value of the on-duty of the gate signals G1 to G4 based on the initial drive control signal Ss. At this time, the wireless power feeding is in an idle state, and a secondary power supply unit 28 of the power receiving device 2 described later supplies a first predetermined voltage Va1 (for example, 5V) at which the wireless module M2 can operate.

  The wireless module M1 includes, for example, a wireless unit 16 that complies with Bluetooth (registered trademark) Low Energy, a processor 17, an input / output circuit 171, a D / A converter 172, and a RAM (Random Access Memory) 173 (first memory). A storage device) and a ROM (Read Only Memory) 174. The input / output circuit 171, the D / A converter 172, the RAM 173, and the ROM 174 will be described later.

  The wireless unit 16 (first wireless unit) has a function of transmitting and receiving signals to and from the wireless unit 26 of the power receiving device 2 via a wireless communication path. Note that both the electric field strength of the wireless unit 16 and the electric field strength of the wireless unit 26 described later are, for example, 35 μV / m or less.

  The communication between the wireless unit 16 and the wireless unit 26 is not limited to radio wave communication, and may be wireless communication such as visible light communication, infrared communication, or ultrasonic communication, and is not limited.

  The processor 17 acquires operation information from an operation unit 19 that is an upper system of the power supply apparatus 1 and includes operation switches, a touch panel, and the like. The processor 17 transmits the operation information acquired from the operation unit 19 to the power receiving device 2 via the wireless unit 16. As a result, the user can operate the load 29. Further, the processor 17 transmits a preset control signal to the power receiving device 2 via the wireless unit 16. Thus, the processor 17 can cause the load 29 to execute a preset operation. The load 29 corresponds to a host system of the power receiving apparatus 2 and is, for example, LED (Light Emitting Diode) illumination, a sensor, a microcomputer, or the like, but is not limited thereto.

  In addition, the processor 17 outputs an alarm to the notification unit 10 that is a host system of the power supply apparatus 1 and includes a liquid crystal display, a speaker, and the like. Thereby, the user can be notified of an error related to wireless power feeding.

  The wireless module M1 operates by being supplied with power of a drive voltage V1 (for example, 3.3 V) from the step-down circuit Re1. The step-down circuit Re1 is an element that is supplied with the power of the driving voltage V1 when the DC voltage Vdc is applied.

  The power receiving device 2 on the power receiving side includes a resonance circuit 21, a rectifier circuit 22, a DC / DC converter (DC conversion circuit; an example of a load) 23, a voltage dividing circuit 24, a wireless module M2, and a step-down circuit Re2. The

  The resonance circuit 21 is an LC resonance circuit in which a power receiving coil L2 and a resonance capacitor C1 are connected in parallel. The resonance circuit 21 wirelessly receives power from the power supply coil L1 of the power supply apparatus 1 and generates a resonance voltage.

  The rectifier circuit 22 includes a diode bridge DB that rectifies input alternating current into direct current, and a smoothing capacitor C2 that smoothes the rectified voltage. As a result, power of the rectified voltage Va is output and supplied to the DC / DC converter 23, the voltage dividing circuit 24, and the step-down circuit Re2. The secondary power supply unit 28 includes a resonance circuit 21 and a rectifier circuit 22.

  The wireless module M2 includes, for example, a wireless unit 26 compliant with Bluetooth (registered trademark) Low Energy, a processor 27, an input / output circuit 271, an A / D converter 272, a RAM 273, and a ROM 274 (second storage device). And comprising. The input / output circuit 271, the A / D converter 272, the RAM 273, and the ROM 274 will be described later. The wireless module M2 operates by being supplied with power of a driving voltage V2 (for example, 3.3V) from the step-down circuit Re2.

  The wireless unit 26 (second wireless unit) has a function of transmitting and receiving signals to and from the power supply apparatus 1 via a wireless communication path. The processor 27 (second processor) is a CPU, for example, and controls the DC / DC converter 23 by executing a power reception control program (not shown). Further, the processor 27 measures the detection voltage V <b> 3 to generate rectified voltage information, and transmits the rectified voltage information to the power supply apparatus 1 by the wireless unit 26. The processor 27 outputs a control signal S4 to the DC / DC converter 23 to start or stop the DC / DC converter 23.

  The processor 27 also receives operation information input from the operation unit 19 of the power supply apparatus 1 via the wireless unit 26 and controls the DC / DC converter 23 and the load 29 based on the operation information.

  The DC / DC converter 23 is a circuit that converts the power of the second predetermined voltage Va2 (for example, 12V) from the secondary-side power supply unit 28 into power of another output voltage Vout. The load 29 is driven by the output voltage Vout of the DC / DC converter 23. The DC / DC converter 23 operates so that the output voltage Vout becomes constant even when the second predetermined voltage Va2 varies. Therefore, the load 29 can be operated stably. The DC / DC converter 23 and the load 29 correspond to the load unit 25 in the power receiving device 2. The DC / DC converter 23 is activated or stopped by a control signal S4 output from the wireless module M2.

  The voltage dividing circuit 24 includes voltage dividing resistors R3 and R4, and applies a detection voltage V3 obtained by dividing the rectified voltage Va to the processor 27 of the wireless module M2.

  The wireless module M2 operates by being supplied with power of a drive voltage V2 (for example, 3.3V) from the step-down circuit Re2. The step-down circuit Re2 is an element to which the rectified voltage Va is applied and supplies power of the driving voltage V2, and here the power is supplied to the wireless module M2.

  FIG. 2 is a diagram illustrating a specific example of the control circuit 11.

  The control circuit 11 includes a step-down circuit 111, operational amplifiers 112 and 113, a comparator 114, a logic circuit 115, and an oscillation circuit 116. The control circuit 11 includes a power supply terminal VDC, a ground terminal GND, a constant voltage terminal VREG that outputs a constant voltage Vreg, input-side terminals FB1, FB2, and a terminal SD, and output-side terminals G1, G2, G3, and G4. , Including.

  A DC voltage Vdc is applied to the power supply terminal VDC, and the ground terminal GND is connected to the ground.

  The step-down circuit 111 is a circuit that generates a constant voltage Vreg. For example, a regulator is connected to the power supply terminal VDC and the ground terminal GND, and the constant voltage Vreg generated from the DC voltage Vdc is output to the constant voltage terminal VREG.

  The operational amplifier 112, the resistor R7, and the capacitor C5 constitute an integrating circuit. One end of the resistor R7 is connected to the inverting input terminal of the operational amplifier 112 via the terminal FB1. One end of the capacitor C5 is connected to the inverting input terminal of the operational amplifier 112 via the terminal FB1, and the other end is connected to the output terminal of the operational amplifier 112. The reference voltage Vref1 is applied to the non-inverting input terminal of the operational amplifier 112.

  When the initial drive control signal Ss is input to the other end of the resistor R7, the integration circuit outputs an output signal SsC obtained by integrating the potential difference between the reference voltage Vref1 and the initial drive control signal Ss. This integration circuit controls with an integration time constant τs so that the initial drive control signal Ss becomes equal to the reference voltage Vref1. The initial drive control signal Ss is input from the initial voltage setting circuit 14 of the initial voltage control circuit 13.

  The operational amplifier 113, the resistor R6, and the capacitor C4 constitute an integration circuit. One end of the resistor R6 is connected to the inverting input terminal of the operational amplifier 113 through the terminal FB2. One end of the capacitor C4 is connected to the inverting input terminal of the operational amplifier 113 via the terminal FB2, and the other end is connected to the output terminal of the operational amplifier 113. A reference voltage Vref2 is applied to the non-inverting input terminal of the operational amplifier 113.

  When the control signal S1 is input to the other end of the resistor R6, this integrating circuit outputs an output signal S1C obtained by integrating the potential difference between the reference voltage Vref2 and the control signal S1. This integration circuit controls with an integration time constant τ1 so that the control signal S1 becomes equal to the reference voltage Vref2. The control signal S1 is input from the processor 17 of the wireless module M1. The operational amplifiers 112 and 113 are collector outputs, and their respective output terminals are connected.

  The output terminal of these operational amplifiers 112 and 113 is connected to the inverting input terminal of the comparator 114, and the lower one of the output signal SsC and the output signal S1C is input. The triangular wave signal St of the oscillation circuit 116 is input to the non-inverting input terminal of the comparator 114. Thereby, an on-duty pulse signal corresponding to the voltage applied to the inverting input terminal can be generated.

  In the logic circuit 115, the output terminal of the comparator 114, the triangular wave signal St, and the terminal SD are connected to the input side, and the output terminal of the gate signal is connected to the output side. The logic circuit 115 generates gate signals G1 and G2 and gate signals G3 and G4 from the upper limit peak and lower limit peak of the triangular wave signal St and the falling edge of the pulse signal input from the comparator 114, respectively. When the control signal S3 is input to the terminal SD from the processor 17 of the wireless module M1, the logic circuit 115 stops the output operation of the gate signals G1 to G4.

  The oscillation circuit 116 oscillates by being connected to the resistor R5 and the capacitor C3, and outputs a triangular wave.

  FIG. 3 is a block diagram illustrating an example of a hardware configuration of the wireless power transmission system S.

  The wireless power transmission system S shown in FIG. 3 schematically shows each part shown in FIG. The wireless power transmission system S includes a power feeding device 1 and a power receiving device 2.

  The power supply apparatus 1 includes a DC power supply 18, an operational amplifier 113, a logic circuit 115, an inverter circuit 12, a power supply coil L 1, a wireless module M 1, a step-down circuit Re 1, an operation unit 19, and a notification unit 10. The wireless module M1 is described as “BLE module”.

  The DC power supply 18 applies a DC voltage Vdc to the step-down circuit Re1, the inverter circuit 12, the operation unit 19, and the notification unit 10. The step-down circuit Re1 applies a drive voltage V1 to the wireless module M1.

  The wireless module M1 includes a processor 17, a wireless unit 16, an input / output circuit 171, a D / A converter 172, a RAM 173, and a ROM 174. The processor 17 performs overall control of the wireless module M1. The input / output circuit 171 acquires operation information from the operation unit 19 and outputs an alarm to the notification unit 10. The D / A converter 172 outputs an analog control signal S 1 to the operational amplifier 113. The input / output circuit 171 and the D / A converter 172 may be included in the processor 17. Further, the D / A converter 172 may be included in the power supply apparatus 1 without being included in the wireless module M1. The RAM 173 provides a work area for the processor 17.

  The ROM 174 is a nonvolatile memory. The ROM 174 is, for example, a flash memory, but is not limited thereto. The ROM 174 permanently stores a power supply control program executed by the processor 17. The power supply control program can be recorded on any computer-readable recording medium such as a CD (Compact Disk), a DVD, or a flash memory.

  The ROM 174 permanently stores various data. In the present embodiment, the ROM 174 permanently stores the identification information of the power supply device 1, the current process value, and the initial value and end value of the process value X. The RAM 173 temporarily stores the current processing value read from the ROM 174 at startup and the next processing value initialized at startup as variables in the work area.

  The identification information includes arbitrary information for the wireless module M1 to wirelessly communicate with the wireless module M2 according to the wireless communication protocol.

  The current processing value is a value corresponding to the processing number Y of the power receiving device 2 to which the power feeding device 1 should be currently connected. The processor 17 performs the connection with the power receiving device 2 having the process number Y corresponding to the current processing value that has entered the power supply range of the power supply device 1 as a connection target.

  The next process value is a value corresponding to the process number Y of the power receiving apparatus 2 to which the power supply apparatus 1 should perform connection next to the power receiving apparatus 2 having the process number Y corresponding to the current process value.

  The initial value and end value of the processing value X are arbitrary values set in advance. One of the initial value and the end value is the minimum value of the processing value X, and the other is the maximum value of the processing value X. The processing value X and the processing number Y will be described later in detail.

  The power receiving device 2 includes a power receiving coil L2, a rectifier circuit 22, a voltage dividing circuit 24, a wireless module M2, a step-down circuit Re2, and a load unit 25. The wireless module M2 is described as “BLE module”. The rectifying circuit 22 supplies the rectified voltage Va to the voltage dividing circuit 24, the step-down circuit Re2, and the load unit 25. The step-down circuit Re2 supplies a drive voltage V2 to the wireless module M2.

  The wireless module M2 includes a processor 27, a wireless unit 26, an input / output circuit 271, an A / D converter 272, a RAM 273, and a ROM 274. The voltage dividing circuit 24 is a voltage dividing resistor that divides the rectified voltage Va. The voltage dividing circuit 24 outputs a detection voltage V3 obtained by dividing the rectified voltage Va to the A / D converter 272 of the wireless module M2. Note that the input / output circuit 271 and the A / D converter 272 may be included in the processor 27. Further, the A / D converter 272 may be included in the power receiving device 2 without being included in the wireless module M2. The RAM 273 provides a work area for the processor 27.

  The ROM 274 is a nonvolatile memory. The ROM 274 is, for example, a flash memory, but is not limited thereto. The ROM 274 permanently stores a power reception control program executed by the processor 27. The power reception control program can be recorded on any computer-readable recording medium such as a CD, a DVD, or a flash memory.

  The ROM 274 permanently stores various data. In the present embodiment, the ROM 274 stores identification information of the power receiving device 2 and a process number.

  The identification information includes arbitrary information for the wireless module M2 to wirelessly communicate with the wireless module M1 according to the wireless communication protocol.

  The process number is a value set in advance for each power receiving device 2. In the present embodiment, it is assumed that a single power feeding device 1 connects to a plurality of power receiving devices 2 in a predetermined order set in advance. When there are n power receiving devices 2, the first power receiving device 2 to the n th power receiving device 2 are sequentially connected by the power feeding device 1.

  For this reason, in this embodiment, the processing value X and the processing number Y corresponding to the order of connection are set to the power feeding device 1 and the power receiving device 2, respectively. Specifically, f (i) is set as the process value Xi corresponding to the i-th (order i) in the power supply apparatus 1, and g (i) is set as the process number Yi in the i-th connected power receiving apparatus 2. ) Is set. The function f and the function g are functions that monotonously increase or decrease monotonically in a range from 1 to n + 1 (1 ≦ i ≦ n + 1), and i is a unique value in a range from 1 to n + 1. The function f is represented by, for example, f (i) = Ai + B. Similarly, the function g is expressed by g (i) = Ci + D, for example. The coefficients A and C are arbitrary values other than 0, and the coefficients B and D are arbitrary values.

  As described above, since the processing value Xi and the processing number Yi are unique values in the range of i from 1 to n, the processing value Xi and the processing number Yi have a one-to-one correspondence. The initial value of the process value corresponds to the process number Y1 corresponding to the first, and the end value of the process value corresponds to the process number Yn corresponding to the nth. The current process value and the next process value correspond to any of process numbers Y1 to Yn. Hereinafter, the initial value of the processing value X is referred to as an initial value X1, and the end value of the processing value X is referred to as an end value Xn.

  For example, when f (i) = g (i) = i, the initial value X1 is 1, the end value Xn is n, and the current process value and the next process value are any one of 1 to n. Moreover, i is set as the process number Yi for the power receiving device 2 connected i-th. In this case, the corresponding process value Xi and process number Yi are the same value.

  When f (i) = n + 1−i and g (i) = 2 × i, the initial value X1 is n, the end value Xn is 1, and the current processing value and the next processing value are any of 1 to n. It becomes. Further, 2 × i is set as the processing number Yi for the power receiving device 2 connected i-th. In this case, the corresponding process value Xi and process number Yi can be different values.

  Next, the operation of the wireless power transmission system S will be described.

  First, the operation of the power receiving device 2 will be described. FIG. 4 is a flowchart illustrating an example of the operation of the power receiving device 2. The power receiving device 2 is powered off when no power is supplied. The power receiving device 2 enters the power supply range of the power supply device 1 and starts the operation of FIG.

  When power is supplied from the power supply device 1, the power receiving device 2 is activated by the supplied power (step S101). When the power receiving device 2 is activated, the processor 27 reads the identification information and the processing number Y of the power receiving device 2 from the ROM 274 (step S102), and temporarily stores them in the RAM 273.

  When the processor 27 reads out the identification information and the process number Y, the processor 27 wirelessly transmits a connection request including the identification information and the process number Y to the power supply apparatus 1 via the wireless unit 26 (step S103). Thereafter, the processor 27 stands by until a connection response is received from the power supply apparatus 1 (step S104). When the processor 27 cannot receive the connection response for a predetermined time (step S104: NO), the processor 27 transmits the connection request again (step S103). Thereafter, the processor 27 transmits a connection request every predetermined time until a connection response is received or until the power supply from the power supply apparatus 1 is completed.

  On the other hand, when the processor 27 receives a connection response from the power supply apparatus 1 (step S104: YES), the processor 27 executes a connection process and connects communication with the power supply apparatus 1 (step S105). Thereby, the processor 27 can perform data communication with the power supply apparatus 1.

  When connected to the power feeding device 1, the processor 27 outputs a connection-in-progress signal to the host system (load 29) of the power receiving device 2 (step S106). The host system of the power receiving device 2 transitions to a state in which data communication is possible when an in-connection signal is input. The host system may be off or in a sleep state until a connection signal is input. The host system of the power receiving device 2 may be supplied with power after the connection process.

  Thereafter, the processor 27 performs data communication with the power supply apparatus 1 via the wireless unit 26 (step S107). By the data communication, for example, data processing such as transmission of data from the host system of the power receiving apparatus 2 to the power feeding apparatus 1 and inspection and update of the host system of the power receiving apparatus 2 is performed. Further, the host system of the power receiving device 2 may be activated by the data communication.

  When the processor 27 becomes unable to communicate with the power supply apparatus 1 during execution of data communication (step S108: YES), the processor 27 executes a disconnection process and disconnects communication with the power supply apparatus 1 (step S111). The processor 27 may determine that communication is impossible when data cannot be received from the power supply apparatus 1 for a predetermined time or longer. As a case where communication with the power supply device 1 is disabled, there may be a communication failure due to an external environment such as an obstacle or electromagnetic noise, or a decrease in received voltage due to the power reception device 2 leaving the power supply range. When disconnected from the power supply apparatus 1, the processor 27 stops outputting the connection signal to the host system (step S112). When the connected signal stops, the host system of the power receiving device 2 may be turned off or may be in a sleep state.

  In addition, when the data communication is completed by the program set in the ROM 274 or the determination of the host system of the power receiving device 2 (step S109: YES), the processor 27 sends a disconnection request to the power feeding device 1 via the wireless unit 26. It transmits by radio (step S113). Thereafter, the processor 27 executes a disconnection process, disconnects the communication with the power supply apparatus 1 (step S111), and stops outputting the connection signal to the host system (step S112).

  Further, when receiving a disconnection request from the power supply apparatus 1 during execution of data communication (step S110: YES), the processor 27 executes a disconnection process to disconnect communication with the power supply apparatus 1 (step S111). The output of the in-connection signal to the system is stopped (step S112). The host system of the power receiving apparatus 2 may be powered off after the connection process.

  Next, the operation of the power feeding device 1 will be described. FIG. 5 is a flowchart illustrating an example of the operation of the power feeding device 1. When the power supply device 1 is activated by the user, the power supply device 1 starts the operation of FIG.

  When the power supply device 1 is activated, first, the processor 17 reads the identification information of the power supply device 1, the current processing value, the initial value X1, and the end value Xn from the ROM 174 (step S201), and temporarily stores them in the RAM 173. To do. At this time, the processor 17 stores the initial value (for example, null value) of the next processing value in the RAM 173. If the current processing value is not set, the processor 17 may set the current processing value to the initial value X1. In the following, it is assumed that the current process value is the process value Xi. Further, the control circuit 11 controls the inverter circuit 12 to start feeding predetermined power (step S202). Thereafter, the processor 17 stands by until a connection request is received from the power receiving device 2 (step S203).

  When the processor 17 receives the connection request from the power receiving apparatus 2 (step S203: YES), the processor 17 checks whether the process number Y included in the received connection request corresponds to the current process value (process value Xi) (step S203). S204). This corresponds to checking whether the order i corresponding to the current process value (process value Xi) matches the order corresponding to the process number Y.

  When the processing number Y included in the received connection request does not correspond to the current processing value (processing value Xi) (step S204: NO), the processor 17 does not connect the power receiving device 2 that transmitted the connection request. It returns to the operation | movement of step S203.

  On the other hand, when the processing number Y included in the received connection request corresponds to the current processing value (processing value Xi) (step S204: YES), the processor 17 determines that the power receiving device 2 that has transmitted the connection request is the i th In the case of the power receiving device 2 connected to, it is determined that the power receiving device 2 that transmitted the connection request is a connection target. Then, the processor 17 wirelessly transmits a connection response including the identification information of the power feeding device 1 to the power receiving device 2 via the wireless unit 16 (step S205). Thereafter, the processor 17 executes a connection process and connects communication with the power receiving apparatus 2 (step S206). Thereby, the processor 17 can perform data communication with the power receiving device 2.

  When connected to the power receiving device 2, the processor 17 outputs a connection-in-progress signal to a host system (such as the operation unit 19) of the power feeding device 1 (step S207). The host system of the power supply apparatus 1 transitions to a state in which data communication is possible when a connection signal is input. The host system may be off or in a sleep state until a connection signal is input.

  Further, the processor 17 calculates a processing value Xi + 1 corresponding to the order i + 1 next to the order i corresponding to the current processing value (processing value Xi), and the processing value Xi + 1 is within the range from the initial value X1 to the end value Xn. (Step S208). Specifically, when the processing value X monotonously increases, that is, when the end value Xn is the maximum value of the processing value X, the processor 17 checks whether the processing value Xi + 1 is equal to or less than the end value Xn. Further, when the processing value X monotonously decreases, that is, when the end value Xn is the minimum value of the processing value X, the processor 17 checks whether the processing value Xi + 1 is equal to or larger than the end value Xn.

  When the processing value Xi + 1 is out of the range (step S208: NO), the processor 17 updates the next processing value to the initial value X1 (step S209). The case where the processing value Xi + 1 is out of range corresponds to the case where the connected power receiving device 2 is the nth power receiving device 2 connected. On the other hand, when the processing value Xi + 1 is within the range (step S208: YES), the processor 17 updates the next processing value to the processing value Xi + 1 (step S210). Thus, in this embodiment, it updates so that the present process value may circulate. As a result, the power receiving device 2 connected next to the nth power receiving device 2 is the first power receiving device 2.

  Thereafter, the processor 17 performs data communication with the power receiving device 2 via the wireless unit 16 (step S211). Through the data communication, for example, the processor 17 can receive data from the host system of the power receiving apparatus 2, inspect and update the host system of the power receiving apparatus 2, and the like. Further, the processor 17 may activate the host system of the power receiving device 2 through the data communication.

  Here, the connection from the power feeding apparatus 1 to the power receiving apparatus 2 to be connected will be described.

  The inverter circuit 12 of the power feeding device 1 drives the power feeding coil L1. The power receiving device 2 generates power in the power receiving coil L2 by electromagnetic induction. This electric power becomes a rectified voltage Va rectified by the rectifier circuit 22, is then divided by the voltage divider circuit 24 to become a detection voltage V 3, and is periodically measured by the A / D converter 272. The processor 27 of the power receiving device 2 transmits the detection voltage V <b> 3 measured by the A / D converter 272 to the power feeding device 1 by the wireless unit 26.

  The processor 17 of the power supply apparatus 1 converts the rectified voltage value received via the wireless unit 16 into a control signal S1 that is an analog voltage by the D / A converter 172. The D / A converter 172 continues to output an analog voltage based on the immediately previous rectified voltage value to the operational amplifier 113 until a new rectified voltage value is received. The operational amplifier 113 outputs an output signal S1C obtained by integrating the input analog voltage to the logic circuit 115 via a comparator 114 with a triangular wave. The logic circuit 115 drives the inverter circuit 12 with a duty corresponding to the output signal S1C. The wireless power transmission system S can control the rectified voltage Va (received voltage) of the power receiving device 2 to be stabilized at a voltage of 12 V (target value) by controlling the power supply power in this way.

  Here, it returns to the flowchart of FIG. When communication with the power receiving apparatus 2 becomes impossible during execution of data communication (step S212: YES), the processor 17 executes disconnection processing and disconnects communication with the power receiving apparatus 2 (step S218). The processor 17 may determine that communication is impossible when data cannot be received from the power receiving apparatus 2 for a predetermined time or more. As a case where communication with the power receiving device 2 becomes impossible, there may be a communication failure due to an external environment such as an obstacle or electromagnetic noise, or a decrease in received voltage due to the power receiving device 2 leaving the power supply range. When disconnected from the power receiving device 2, the processor 17 stops outputting the connecting signal to the host system (step S219). When the connected signal stops, the host system of the power supply apparatus 1 may be turned off or may be in a sleep state.

  In addition, when the processor 17 receives a disconnection request from the power receiving device 2 during execution of data communication (step S213: YES), that is, when data communication is completed, the processor 17 sets the current processing value (processing value Xi) to the next value. The processing value (initial value X1 or processing value Xi + 1) is updated (step S217). Thereafter, the processor 17 executes a disconnection process, disconnects the communication with the power receiving apparatus 2 (step S218), and stops outputting the connecting signal to the host system (step S219).

  4 and 5, the power receiving apparatus 2 determines completion of data communication, but the power supply apparatus 1 may determine completion of data communication. In this case, when the data communication is completed, the power feeding device 1 may transmit a disconnection request to the power receiving device 2.

  Further, when the processor 17 receives a connection request from the new power receiving apparatus 2 during execution of data communication (step S214: YES), the processing number Y included in the received connection request is the next processing value (initial value Xi). Alternatively, it is confirmed whether it corresponds to the processing value Xi + 1) (step S215). This corresponds to checking whether the order (1 or i + 1) corresponding to the next processing value (initial value Xi or processing value Xi + 1) matches the order corresponding to the processing number Y.

  If the processing number Y included in the received connection request does not correspond to the next processing value (initial value X1 or processing value Xi + 1) (step S215: NO), the power receiving device 2 that has transmitted the connection request It determines that it is not the next connection object, and returns to the operation of step S211.

  On the other hand, when the processing number Y included in the received connection request corresponds to the next processing value (initial value X1 or processing value Xi + 1) (step S215: YES), the processor 17 receives the connection request. When 2 is the power receiving device 2 connected to the first or i + 1th, it is determined that the power receiving device 2 that transmitted the connection request is the next connection target. Then, the processor 17 wirelessly transmits a disconnection request to the connected power receiving device 2 via the wireless unit 16 (step S216), and sets the current processing value (processing value Xi) to the next processing value (initial value X1). Alternatively, it is updated to the processing value Xi + 1) (step S217), the disconnection process is executed, the communication with the connected power receiving apparatus 2 is disconnected (step S218), and the output of the connecting signal to the host system is stopped (step S218). S219).

  The processor 17 repeatedly executes the operations of steps S203 to S219 after the power supply device 1 is activated by the user. When the power of the power supply apparatus 1 is turned off by the user, the processor 17 stores the current processing value updated by the operations in steps S203 to S219 in the ROM 174 (step S221), and ends the power supply (step S222). ).

  When the power supply apparatus 1 is next activated, the processor 17 reads the current processing value stored in step S221. In the above description, it is assumed that the current processing value is stored in the ROM 174 when power supply is terminated. However, the current processing value may be stored in the ROM 174 every time it is updated. In this case, step S221 is not necessary.

  Next, a specific example of the operation of the wireless power transmission system S will be described. FIG. 6 is a diagram illustrating a specific example of the operation of the wireless power transmission system S. In the example of FIG. 6, it is assumed that ten power receiving devices 2a to 2j are conveyed by the conveyor 3 so as to pass through the power supply range of the power supply device 1 in order (n = 10). Further, in the example of FIG. 6, i = Xi = Yi, the power feeding device 1 is set to 1 as the initial value X1, and 10 is set as the end value X10, and the power receiving devices 2a to 2j are processed numbers 1 to 2, respectively. It is assumed that 10 is set. Further, it is assumed that the power supply device 1 is set to 1 where the current processing value is the initial value X1.

  When the power receiving device 2 does not exist in the power supply range of the power feeding device 1, since no power receiving device 2 is powered off, the connection request is not transmitted. Since the power supply apparatus 1 cannot receive the connection request (step S203: NO), it waits for the reception of the connection request.

  As shown in FIG. 6, when the conveyor 3 advances and the first power receiving device 2a enters the power supply range, the power receiving device 2a is activated by power feeding from the power feeding device 1 (step S101), and the processor 27 is connected to the power receiving device 2a. The process number “1” is read (step S102), and a connection request is transmitted to the power supply apparatus 1 (step S103). When the processor 17 of the power supply apparatus 1 receives this connection request (step S203: YES), the process number “1” included in the connection request corresponds to the current process value “1” (step S204: YES). Then, a connection response is transmitted to the power receiving apparatus 2a (step S205), connected to the power receiving apparatus 2a (step S206), and a connecting signal is output to the host system (step S207). Further, since the processing value “2” corresponding to the next order “2” is equal to or less than the end value “10” (step S208: YES), the processor 17 updates the next processing value “1” to 2. (Step S210). Thereafter, the power feeding device 1 performs data communication with the power receiving device 2a (step S211).

  On the other hand, when the processor 27 of the power receiving apparatus 2a receives a connection response from the power supply apparatus 1 (step S104: YES), the processor 27 is connected to the power supply apparatus 1 (step S105), and outputs a connecting signal to the higher system (step S106). . Thereafter, the power receiving device 2a performs data communication with the power feeding device 1 (step S107).

  When the data communication is completed (step S109: YES), the processor 27 of the power receiving apparatus 2a transmits a disconnection request to the power supply apparatus 1 (step S113), disconnects from the power supply apparatus 1 (step S111), and stops the connected signal. (Step S112).

  When receiving the disconnection request from the power receiving device 2a (step S213: YES), the power feeding device 1 updates the current processing value “1” to the next processing value “2” (step S217), and disconnects from the power receiving device 2a. (Step S218), the connection signal is stopped (Step S219).

  Thereafter, the power supply apparatus 1 waits for reception of a connection request (step S203). Further, the power receiving apparatus 2a transmits a connection request every predetermined time until it exits from the power supply range (step S103). At this point, since the current processing value is set to 2 and the next processing value is set to 2, the processor 17 can receive a connection request from the power receiving apparatus 2a whose processing number is set to 1. (Step S203: YES), it is determined that the power receiving apparatus 2a is not a connection target (Step S204: NO).

  Each time the conveyor 3 advances and a new power receiving device 2 enters the power supply range, the wireless power transmission system S performs the same operation as described above. When the connection to the ninth power receiving apparatus 2i is completed, both the current process value and the next process value are set to 10.

  When the conveyor 3 advances and the tenth power receiving device 2j enters the power supply range, the power receiving device 2j is activated by the power supply from the power supply device 1 (step S101), and the processor 27 reads the process number “10” of the power receiving device 2j. (Step S102), a connection request is transmitted to the power supply apparatus 1 (Step S103). When the processor 17 of the power supply apparatus 1 receives this connection request (step S203: YES), the process number “10” included in the connection request corresponds to the current process value “10” (step S204: YES). Then, a connection response is transmitted to the power receiving apparatus 2j (step S205), connected to the power receiving apparatus 2j (step S206), and a connecting signal is output to the host system (step S207). However, since the processing value “11” corresponding to the next order “11” is larger than the end value “10” (step S208: NO), the processor 17 changes the next processing value “10” to the initial value “1”. (Step S209). Thereafter, the power feeding device 1 performs data communication with the power receiving device 2j (step S211).

  On the other hand, when the processor 27 of the power receiving apparatus 2j receives a connection response from the power supply apparatus 1 (step S104: YES), the processor 27 is connected to the power supply apparatus 1 (step S105), and outputs a connecting signal to the higher system (step S106). . Thereafter, the power receiving device 2j performs data communication with the power feeding device 1 (step S107).

  When the data communication is completed (step S109: YES), the processor 27 of the power receiving device 2j transmits a disconnection request to the power supply device 1 (step S113), disconnects from the power supply device 1 (step S111), and stops the connection signal. (Step S112).

  When receiving the disconnection request from the power receiving device 2j (step S213: YES), the power supply device 1 updates the current processing value “10” to the next processing value “1” (step S217), and disconnects from the power receiving device 2j. (Step S218), the connection signal is stopped (Step S219).

  Thereafter, the power supply apparatus 1 waits for reception of a connection request (step S203). Further, the power receiving apparatus 2j transmits a connection request every predetermined time until it exits from the power supply range (step S103). At this point, since the current processing value is set to 1 and the next processing value is set to 1, the processor 17 can receive a connection request from the power receiving apparatus 2j whose processing number is set to 10. (Step S203: YES), it is determined that the power receiving device 2j is not a connection target (Step S204: NO).

  When the conveyor 3 is a circulation type conveyor and the power receiving devices 2a to 2j enter the power supply range again, the wireless power transmission system S performs the above operation every time the power receiving devices 2a to 2j enter the power supply range. . Each time the power receiving devices 2a to 2j enter the power supply range, the contents of the data processing performed by the power feeding device 1 are changed, so that the power receiving devices 2a to 2j are maintained in the order of the power receiving devices 2a to 2j. Batch processing can be executed.

  Further, by setting the processing numbers of 10 power receiving devices 2k to 2t different from the power receiving devices 2a to 2j to 1 to 10, respectively, the same processing as the power receiving devices 2a to 2j is performed on the power receiving devices 2k to 2t. Can be executed.

  Here, the case where the power feeding device 1 and the power receiving device 2 become incapable of communication and the case where the two power receiving devices 2 simultaneously enter the power feeding range will be described.

  First, a case where communication between the power feeding device 1 and the power receiving device 2 becomes impossible will be described. Here, it is assumed that the power feeding device 1 and the power receiving device 2a are in data communication (steps S107 and S211). At this time, as described above, the current processing value is set to 1 and the next processing value is set to 2.

  When the power receiving apparatus 2a becomes unable to communicate with the power feeding apparatus 1 (step S108: YES), the power receiving apparatus 2a disconnects from the power feeding apparatus 1 (step S111), and stops the signal indicating that it is connected to the host system (step S112). At this time, when the power receiving device 2a is still included in the power supply range, the processor 27 resumes transmission of the connection request (step S103). At this time, since the power receiving apparatus 2a has been activated and the process number “1” has been read, steps S101 and S102 are omitted.

  When the power feeding device 1 becomes unable to communicate with the power receiving device 2a (step S212: YES), the power feeding device 1 disconnects from the power receiving device 2a (step S218), stops the connection signal to the host system (step S219), and receives the connection request. Is resumed (step S203). That is, even if the power feeding device 1 and the power receiving device 2a become unable to communicate, the current processing value “1” is not updated.

  Thereafter, when the power feeding device 1 and the power receiving device 2a can communicate with each other, the power feeding device 1 receives a connection request from the power receiving device 2a (step S203: YES). At this time, since the current processing value is 1, the power supply apparatus 1 determines that the power receiving apparatus 2a is a connection target (step S204: YES). As a result, data communication between the power feeding device 1 and the power receiving device 2a is resumed.

  As described above, according to the present embodiment, even when communication between the power feeding device 1 and the power receiving device 2 that are performing data communication is disabled, the power feeding device 1 and the power receiving device 2 are restored after the communication state is recovered. Data communication can be automatically resumed.

  Next, the case where the two power receiving apparatuses 2 enter the power supply range at the same time will be described. Here, it is assumed that the power receiving apparatuses 2a and 2b enter the power supply range at the same time. When the power receiving device 2b enters the power supply range, the current processing value is set to 1 and the next processing value is set to 2 as described above.

  When the conveyor 3 advances and the second power receiving device 2b enters the power supply range during data communication between the power supplying device 1 and the power receiving device 2a, the power receiving device 2b is activated by power supply from the power supplying device 1 (step S101). The processor 27 reads the process number “2” of the power receiving apparatus 2b (step S102), and transmits a connection request to the power supply apparatus 1 (step S103). When the processor 17 of the power supply apparatus 1 receives this connection request (step S214: YES), the process number “2” included in the connection request corresponds to the next process value “2” (step S215: YES). Then, the disconnection request is transmitted to the power receiving device 2a (step S216), the current processing value “1” is updated to the next processing value “2” (step S217), the power receiving device 2a is disconnected (step S218), and the connection is made. The medium signal is stopped (step S219), and the standby for receiving the connection request is resumed (step S203).

  Since the power receiving device 2b transmits a connection request every predetermined time, when the processor 17 resumes waiting for reception of the connection request, the processor 17 receives the connection request from the power receiving device 2b again (step S203: YES). At this time, since the current processing value is 2, the power feeding apparatus 1 determines that the power receiving apparatus 2b is a connection target (step S204: YES). As a result, data communication between the power feeding device 1 and the power receiving device 2b is started.

  Thus, according to the present embodiment, when another power receiving device 2 to be connected next enters the power feeding range while the power feeding device 1 performs data communication with the power receiving device 2, the power feeding device 1 Data communication with other power receiving apparatuses 2 can be started automatically.

  As described above, the power supply device 1 according to the present embodiment sets the power receiving device 2 as a connection target in a predetermined order based on the current processing value, the next processing value, and the processing number Y of the power receiving device 2. It is possible to select and execute data communication with the selected power receiving apparatus 2. In other words, it is possible to provide the wireless power transmission system S in which the power receiving device 1 can select the power receiving device 2 to be connected in a predetermined order. As a result, the power feeding device 1 receives the data from the host system of the power receiving device 2 while maintaining the predetermined order of the power receiving device 2 and stabilizes the power receiving voltage of the power receiving device 2, and the power receiving device 2 The system can be inspected and updated.

  In addition, since the power supply device 1 according to the present embodiment does not require a table for centrally managing the plurality of power receiving devices 2, the storage capacity of the RAM 173 and the ROM 174 can be reduced.

Second Embodiment
A wireless power transmission system S according to the second embodiment will be described with reference to FIGS. 7 and 8. The hardware configuration of the wireless power transmission system S according to the present embodiment is the same as that of the first embodiment. Hereinafter, the difference from the first embodiment will be mainly described.

  In the present embodiment, the ROM 174 stores identification information of the power supply device 1, a current processing value, and an initial value X1. That is, the RAM 173 (first storage device) and the ROM 174 do not store the end value Xn.

  In the present embodiment, the ROM 274 (second storage device) stores the identification information of the power receiving device 2, the process number Y, and the next process number y. The next process number y is the process number Y of the power receiving apparatus 2 to be connected next to the power receiving apparatus 2.

  The process number is a value set in advance for each power receiving device 2. In the present embodiment, it is assumed that a single power feeding device 1 connects to a plurality of power receiving devices 2 in a predetermined order set in advance. When there are n power receiving devices 2, the first power receiving device 2 to the n th power receiving device 2 are sequentially connected by the power feeding device 1.

  In this embodiment, the order of the power receiving apparatuses 2 to be connected is specified by the next processing number y. For this reason, a random processing value X and a processing number Y can be set in the power feeding device 1 and the power receiving device 2, respectively. For example, a random processing number Yi is set for the i-th connected power receiving device 2, and a random processing number Yi + 1 is set for the i + 1th connected power receiving device 2. In this case, Yi + 1 is set as the next processing number y in the power receiving device 2 connected i-th. The current process value and the next process value are updated by the process number Y and the next process number y received from the power receiving apparatus 2. For this reason, the current process value and the next process value coincide with the process number Y and the next process number y of any one of the power receiving apparatuses 2. As in the first embodiment, the power supply device 1 and the power receiving device 2 may be set with a processing value X and a processing number Y corresponding to the order of connection.

  Next, the operation of the wireless power transmission system S in the present embodiment will be described.

  First, the operation of the power receiving device 2 will be described. FIG. 7 is a flowchart illustrating an example of the operation of the power receiving device 2. Steps S301 and S304 to S313 in FIG. 7 are the same as steps S101 and S104 to S113 in FIG.

  When the power receiving device 2 is supplied with power from the power supply device 1, the power receiving device 2 is activated by the supplied power (step S301). When the power receiving device 2 is activated, the processor 27 reads the identification information, the processing number Y, and the next processing number y of the power receiving device 2 from the ROM 274 (step S302), and temporarily stores them in the RAM 273.

  When the processor 27 reads the identification information, the processing number Y, and the next processing number y, the power supply apparatus 1 sends a connection request including the identification information, the processing number Y, and the next processing number y via the wireless unit 26. Is transmitted wirelessly (step S303). Thereafter, the processor 27 stands by until a connection response is received from the power supply apparatus 1 (step S304). When the processor 27 cannot receive the connection response for a predetermined time (step S304: NO), the processor 27 transmits the connection request again (step S303). Thereafter, the processor 27 transmits a connection request every predetermined time until a connection response is received or until the power supply from the power supply apparatus 1 is completed.

  On the other hand, when the processor 27 receives a connection response from the power supply apparatus 1 (step S304: YES), the processor 27 executes a connection process and connects communication with the power supply apparatus 1 (step S305). Thereby, the processor 27 can perform data communication with the power supply apparatus 1. Subsequent operations are the same as those in the first embodiment.

  Next, the operation of the power feeding device 1 will be described. FIG. 8 is a flowchart illustrating an example of the operation of the power feeding apparatus 1. Steps S402, S404 to S407, and S409 to S420 in FIG. 8 are the same as steps S202, S204 to S207, and S211 to S222 in FIG.

  When the power supply device 1 is activated, first, the processor 17 reads the identification information of the power supply device 1, the current processing value, and the initial value X1 from the ROM 174 (step S401), and temporarily stores them in the RAM 173. At this time, the processor 17 stores the initial value (for example, null value) of the next processing value in the RAM 173. If the current processing value is not set, the processor 17 may set the current processing value to the initial value X1. In the following, it is assumed that the current processing value is the processing value X. Further, the control circuit 11 controls the inverter circuit 12 to start feeding predetermined power (step S402). Thereafter, the processor 17 stands by until a connection request is received from the power receiving device 2 (step S403).

  When the processor 17 receives the connection request from the power receiving apparatus 2 (step S403: YES), the processor 17 checks whether or not the process number Y included in the received connection request matches the current process value (process value X) (step S403). S404).

  When the processing number Y included in the received connection request does not match the current processing value (processing value X) (step S404: NO), the power receiving device 2 that transmitted the connection request is not a connection target. It returns to the operation | movement of step S403.

  On the other hand, when the processing number Y included in the received connection request matches the current processing value (processing value X) (step S404: YES), the processor 17 is connected to the power receiving device 2 that has transmitted the connection request. Judge that there is. Then, the processor 17 wirelessly transmits a connection response including the identification information of the power feeding device 1 to the power receiving device 2 via the wireless unit 16 (step S405). Thereafter, the processor 17 executes a connection process and connects communication with the power receiving apparatus 2 (step S406). Thereby, the processor 17 can perform data communication with the power receiving device 2.

  When connected to the power receiving device 2, the processor 17 outputs a connection-in-progress signal to the host system (such as the operation unit 19) of the power feeding device 1 (step S407). The host system of the power supply apparatus 1 transitions to a state in which data communication is possible when a connection signal is input. The host system may be off or in a sleep state until a connection signal is input.

  Further, the processor 17 updates the next processing value to the next processing number y included in the connection request received from the power receiving apparatus 2 (step S408).

  Thereafter, the processor 17 performs data communication with the power receiving device 2 via the wireless unit 16 (step S409). Through the data communication, for example, the processor 17 can receive data from the host system of the power receiving apparatus 2, inspect and update the host system of the power receiving apparatus 2, and the like. Further, the processor 17 may activate the host system of the power receiving device 2 through the data communication. Subsequent operations are the same as those in the first embodiment.

  As described above, the power feeding device 1 according to the present embodiment determines the power receiving device 2 based on the current processing value and the next processing value, the processing number Y of the power receiving device 2, and the next processing number y. In this order, it is selected as a connection target, and data communication with the selected power receiving apparatus 2 can be executed. In other words, it is possible to provide the wireless power transmission system S in which the power receiving device 1 can select the power receiving device 2 to be connected in a predetermined order. As a result, the power feeding device 1 receives the data from the host system of the power receiving device 2 while maintaining the predetermined order of the power receiving device 2 and stabilizes the power receiving voltage of the power receiving device 2, and the power receiving device 2 The system can be inspected and updated.

  In addition, since the power supply device 1 according to the present embodiment does not require a table for centrally managing the plurality of power receiving devices 2, the storage capacity of the RAM 173 and the ROM 174 can be reduced.

  Moreover, according to this embodiment, the new power receiving apparatus 2 can be easily added and deleted in a desired order. For example, in the first embodiment, when a k-th new power receiving device 2 is added, the process number set for the (k + 1) th power receiving device 2 and the end value Xn set for the power feeding device 1 is updated. There is a need to. On the other hand, in this embodiment, the next processing number y set in the (k−1) th power receiving device 2 is updated to the processing number Y of the new power receiving device 2, and the next processing of the new power receiving device 2 is performed. The new power receiving device 2 can be added as the kth power receiving device 2 by setting the number y to the processing number Y of the kth power receiving device 2 before the new power receiving device 2 is added.

(Modification)
The present invention is not limited to the above-described embodiment, and can be modified without departing from the spirit of the present invention. For example, there are the following (a) to (j).

(A) The DC / DC converter 23 is not essential for the power receiving device 2, and the load 29 may be directly connected thereto.
(B) The target to be controlled from the host system of the power supply apparatus 1 is not limited to the DC / DC converter 23, and for example, the load 29 may be directly controlled.
(C) The wireless communication protocol between the power feeding device 1 and the power receiving device 2 is not limited to Bluetooth (registered trademark) Low Energy, and may be Wi-Fi (registered trademark), ZIGBEE (registered trademark), or the like. .
(D) The wireless communication between the power feeding device 1 and the power receiving device 2 is not limited to radio wave communication. If an appropriate wireless communication path can be established, wireless communication such as infrared communication, visible light communication, and ultrasonic communication can be used. There may be, and it is not limited.
(E) The feedback control is not limited to the proportional control (classical control) shown in the above embodiment, and may be classic control such as PI control or PID control, or modern control, and is not limited.
(F) Instead of the integration circuit included in the control circuit 11, integration processing may be performed using a digital signal processor.
(G) The processors 17 and 27 do not need to output a connection signal to the higher system.
(H) In FIG. 6, the conveying means of the power receiving device 2 is not limited to the conveyor 3, and may be a robot arm, a drone, an automatic guided vehicle, or the like. Further, the power feeding device 1 may be transported instead of the power receiving device 2.
(I) In FIG. 3, instead of the D / A converter 172, the operational amplifier 113, and the logic circuit 115, the inverter circuit 12 may be directly driven using a PWM control unit built in the BLE module M <b> 1.
(J) The wireless power transmission method may use a magnetic resonance method instead of electromagnetic induction.

S wireless power transmission system 1 power feeding device 10 notification unit 11 control circuit 111 step-down circuit 112, 113 operational amplifier 114 comparator 115 logic circuit 116 oscillation circuit R5-R7 resistor C3-C5 capacitor 12 inverter circuit (an example of an inverter)
13 Initial voltage control circuit 14 Initial voltage setting circuit 15 Initial voltage setting release circuit M1 Wireless module 16 Wireless unit (an example of a first wireless unit)
17 processor (an example of a first processor)
171 I / O circuit 172 D / A converter 173 RAM (first storage device)
174 ROM
18 DC power supply 19 Operation unit L1 Power supply coil Re1, Re2 Step-down circuit 2 Power receiving device 21 Resonant circuit L2 Power receiving coil C1 Resonant capacitor 22 Rectifier circuit DB Diode bridge C2 Smoothing capacitor 23 DC / DC converter (DC conversion circuit)
24 voltage divider circuit 25 load section M2 wireless module 26 wireless unit (example of second wireless unit)
27 processor (example of second processor)
271 I / O circuit 272 A / D converter 273 RAM
274 ROM (second storage device)
28 Secondary power supply unit 29 Load Va Rectified voltage

Claims (8)

A wireless power transmission system including a power feeding device and a power receiving device,
The power supply device
A feeding coil that transmits power wirelessly;
An inverter for driving the feeding coil;
A first wireless unit that wirelessly communicates with the power receiving device;
A first processor for controlling the first wireless unit and the inverter;
A first storage device for storing a current processing value and a next processing value;
With
The power receiving device is:
A power receiving coil that wirelessly receives power from the power feeding coil of the power feeding device;
A second wireless unit that wirelessly communicates with the first wireless unit included in the power supply device;
A second processor for controlling the second wireless unit;
A second storage device for storing a preset process number;
With
When the second processor is activated by power feeding from the power feeding device, the second processor transmits the processing number to the power feeding device,
When the first processor receives the processing number from the power receiving device, the first processor connects to the power receiving device when the processing number corresponds to the current processing value. 2. The wireless power transmission according to claim 1, wherein when the first processor receives a disconnection request from the connected power receiving apparatus, the first processor disconnects from the power receiving apparatus and updates the current processing value to the next processing value. system. When the first processor receives the processing number from another power receiving device during connection with the power receiving device, and the processing number corresponds to the next processing value, the first processor The wireless power transmission system according to claim 1, wherein the wireless power transmission system is disconnected and the current processing value is updated to the next processing value. 4. The device according to claim 1, wherein when the first processor becomes unable to communicate with the connected power receiving device, the first processor disconnects from the power receiving device and maintains the current processing value. 5. The wireless power transmission system described. The first storage device stores an initial value and an end value of the processing value set in advance,
When the first processor is connected to the power receiving device, the first processor calculates a value corresponding to an order next to the current processing value, and the value is within a range from the initial value to the end value. The wireless power transmission system according to any one of claims 1 to 4, wherein if there is, the next processing value is updated to the value. The first storage device stores an initial value and an end value of the processing value set in advance,
When the first processor is connected to the power receiving device, the first processor calculates a value corresponding to the next order of the order corresponding to the current processing value, and the value is outside the range from the initial value to the end value. The wireless power transmission system according to any one of claims 1 to 5, wherein, when there is, the next processing value is updated to the initial value. The second storage device stores a preset next processing number,
When the second processor is activated by power supply from the power supply device, the second processor transmits the next processing number to the power supply device.
5. The first processor according to claim 1, wherein, when connected to the power receiving device, the first processor updates the next processing value to the next processing number received from the power receiving device. 6. Wireless power transmission system. A wireless power transmission system communication method including a power feeding device and a power receiving device,
The power supply device
A feeding coil that transmits power wirelessly;
An inverter for driving the feeding coil;
A first wireless unit that wirelessly communicates with the power receiving device;
A first processor for controlling the first wireless unit and the inverter;
A first storage device for storing a current processing value and a next processing value;
With
The power receiving device is:
A power receiving coil that wirelessly receives power from the power feeding coil of the power feeding device;
A second wireless unit that wirelessly communicates with the first wireless unit included in the power supply device;
A second processor for controlling the second wireless unit;
A second storage device for storing a preset process number;
With
When the second processor is activated by power feeding from the power feeding device, the step of transmitting the processing number to the power feeding device;
When the first processor receives the processing number from the power receiving device, and if the processing number corresponds to the current processing value, connecting to the power receiving device;
Including a communication method.

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