JP2015139229A - Wireless power supply device and wireless power reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless power supply device enabling the use of mobile electronic equipment without a hindrance if the mobile electronic equipment is being charged inside an automobile.SOLUTION: In a wireless power supply device for supplying power from a power transmission device 1 to the equipment of a power supply target (mobile electronic equipment 3 having built-in power reception equipment) with magnetic field resonance, the power transmission device 1 includes: a power transmission circuit 12 for supplying power to feed to the power reception equipment; a plurality of power transmission coils 10 connected to the power reception circuit 12; and a switching circuit 13 for switching the power supply through a selected power transmission coil. The power transmission circuit 12 includes a control unit 121 for successively supplying power to each transmission coil 10 and measures each power supply capability to search for a power transmission coil 10 having high power supply capability and select it.

Description

  The present invention relates to an apparatus for charging a portable electronic device in a car of a car, a wireless power supply device suitable for performing wireless charging on a mobile electronic device such as a smartphone in the vehicle, and the wireless power supply device suitable for the wireless power supply device. The present invention relates to a wireless power receiving device.

Conventionally, when charging a portable electronic device such as a smartphone in a car, power is supplied by connecting a power adapter from a cigarette lighter socket installed in the car with a cable (cable connection).
As a technique for supplying power without contact with a cable, wireless charging by an electromagnetic induction method or a magnetic resonance method has been proposed.
As the wireless charging by the electromagnetic induction method, for example, a method described in Patent Document 1 is known. The industry group Wireless Power Consortium has formulated a standard (Non-Patent Document 1) related to this method, and products compliant with the standard are distributed in the market.

  For wireless charging by the magnetic field resonance method, for example, methods described in Patent Documents 2, 3, and 4 are known. According to these methods, it is possible to extend the power transmission distance to some extent as compared with the electromagnetic induction method. As a result, restrictions on the alignment of the power transmission coil and the power reception coil are relaxed. For example, if a power supply stand is embedded in the center console of the vehicle, charging can be performed even if a portable electronic device (smartphone) is placed in the vicinity. Become.

Japanese Patent Laid-Open No. 10-23677 JP 2001-185939 A JP 2010-183812 A JP 2013-126326 A

System Description Wireless Power Transfer Volume I: Low Power Part 1: Interface Definition Version 1.1, March 2012

However, when charging a portable electronic device from a cigarette lighter socket via a cable, there are problems such as troublesome cable connection and concerns that the cable connector may be damaged due to vibration during traveling. .
Further, in the case of the techniques described in Patent Document 1 and Non-Patent Document 1, it is generally necessary to set the distance between the power supply base and the power receiving unit provided in the portable electronic device to several millimeters or less. Has a problem that it is difficult to operate the smartphone during that time because it is necessary to fix the smartphone on the power supply stand.

  In the case of the technique described in Patent Document 2, the standard of the power transmission distance is equivalent to the diameter of the power transmission coil and the power reception coil. Considering the size of the power receiving coil that can be mounted on a portable electronic device, even if the power supply stand is embedded in the center console or dashboard installed in the car, for example, a passenger sitting in the passenger seat is using a smartphone. It is difficult to charge. Therefore, there is a problem that it is difficult to use the smartphone without worrying about running out of the battery while riding the traveling vehicle.

  Patent Document 3 and Patent Document 4 propose a method in which a plurality of power transmission coils are installed in advance and an optimal power transmission coil is selected. No consideration is given to shortening the time until a power transmission coil is selected and power feeding is started.

  The present invention has been proposed in view of the above circumstances, and a wireless power feeding device and a wireless power receiving device suitable for the wireless power feeding device that can be used without any trouble even when the portable electronic device is being charged in a car. The purpose is to provide.

In order to achieve the above object, claim 1 of the present invention is a wireless power feeder that supplies magnetic power from a power transmitting device to a power receiving device using magnetic resonance, and includes the following configuration.
The power transmission device includes a power transmission circuit that supplies power to supply power to the power receiving device, a plurality of power transmission coils connected to the power transmission circuit, a switching circuit that switches the power supply via a selected power transmission coil, Is provided.
The power transmission circuit includes a control unit that sequentially feeds power to the power transmission coils, measures each power feeding capability, and searches for and selects a power transmission coil having a high power feeding capability.

According to a second aspect of the present invention, in the wireless power supply apparatus according to the first aspect, the control unit is a power supply target in the past, and a power transmission / reception device communication unit for receiving an identifier of the power reception device from the power reception target device. A recording unit that holds usage history information including a combination of usage frequencies of the identifier of the power receiving device and the identifier of the power transmission coil used at that time; and
When a power transmission circuit is newly driven, a power transmission coil with a high power supply capability is selected from among the top usage frequencies when the identifier of the power receiving device is registered in the usage history information with reference to the identifier of the power receiving device and the usage history information. The search is started.

  According to a third aspect of the present invention, in the wireless power feeding apparatus according to the first aspect, each of the power transmission coils is disposed in a belt-like portion of a seat belt installed in a room of an automobile, and the power reception is performed according to a change in a physique or posture of a seated user. It is characterized in that power is transmitted from a power transmission coil having a high power supply capability for the device.

  According to a fourth aspect of the present invention, in the wireless power feeding apparatus according to the third aspect, the seat belt includes a seat belt fitting that fits into a buckle installed in the room when the seat belt is attached, and a power transmission coil side connector is attached to the seat belt fitting. In addition, a power transmission circuit side connector is provided in the buckle, and the power transmission coil side connector and the power transmission circuit side connector are coupled to each other to energize the power transmission coil in conjunction with the coupling of the seat belt and the buckle. .

  A wireless power feeder according to claim 3 or claim 4, further comprising: a sensor that detects seating of a user and wearing of a seat belt; and an ECU (Electronic Control Unit) that receives a signal detected by the sensor. The ECU further includes means for transmitting a signal for starting power supply necessary for driving the power transmission circuit to the power transmission circuit with the reception of the signal as a trigger.

  According to a sixth aspect of the present invention, in the wireless power feeding apparatus according to the first aspect, each of the power transmission coils is arranged on the vehicle body side in the lining of the door of the automobile or the lining of the vehicle body pillar, and responds to changes in the physique and posture of the seated user. Then, power is transmitted from a power transmission coil having a high power supply capability for the power receiving device.

  According to a seventh aspect of the present invention, in the wireless power feeding device according to the first aspect, each of the power transmission coils is disposed in a driver's seat or a passenger seat of an automobile, It is characterized by transmitting power from a power transmission coil with high power supply capability.

Claim 8 is a wireless power feeder that supplies power from a power transmission device to a power receiving device using magnetic resonance,
The power transmission device includes a plurality of power transmission circuits integrated with a power transmission coil to supply power to the power receiving device, a switching circuit for switching via a selected power transmission circuit, and each power transmission circuit It is characterized by comprising a control unit that sequentially supplies power, measures each power supply capability, searches for a power transmission circuit having a high power supply capability, and selects one or a plurality of power transmission circuits used for power transmission.

Claim 9 is the wireless power supply apparatus according to claim 8, wherein the control unit is a power supply target in the past, and a communication unit between power transmission and reception devices for receiving an identifier of the power reception device from a power reception device to be power supply target. A recording unit that holds usage history information including a combination of usage frequencies of the identifier of the power receiving device and the identifier of the power transmission coil used at that time;
When a power transmission circuit is newly driven, the power receiving circuit with the highest power supply capability is selected from among the highest usage frequencies when the identifier of the power receiving device is registered in the usage history information with reference to the identifier of the power receiving device and the usage history information. The search is started.

  The wireless power feeding apparatus according to claim 8, wherein the power transmission circuit is disposed in a belt-like portion of a seat belt installed in a room of an automobile, and the power receiving device according to a change in a physique or posture of a seated user It is characterized by transmitting power from a power transmission coil having a high power supply capability.

  An eleventh aspect of the present invention is a power receiving device for supplying power from a power transmission device using magnetic field resonance, an identifier recognition unit for acquiring an identifier of the power reception device, and an identifier communication unit for notifying the power transmission device of the identifier. It is characterized by comprising.

  According to the wireless power feeding device of the present invention, a plurality of power transmission coils are provided, power is sequentially fed to each power transmission coil, each power feeding capability is measured, a power transmission coil having a high power feeding capability is searched, and a power receiving device is received by the power transmission coil. Since power is supplied to the user, even if the user has a different physique or the posture of the user changes, power can be transmitted from the power transmission coil (one or more) having high power supply capability to the power receiving device. It becomes possible.

  In addition, a power transmission coil having a high power supply capability is provided by having a communication unit between power transmission and reception devices and a recording unit to maintain a use history of the power transmission coil and refer to the history when power is supplied to the same power receiving device from the next time. It is possible to shorten the time from selecting to start feeding.

  By arranging a plurality of power transmission coils on the seat belt, a power transmission coil having a high power supply capability can be easily obtained from among the plurality of power transmission coils for a power receiving device owned by a user seated on the seat of the automobile.

  By selecting a power transmission coil (one or more) having a high power supply capability, it is possible to suppress the influence on peripheral devices due to the radiation of unnecessary electromagnetic noise by not energizing a power transmission coil that is not selected and transmitting power. it can.

It is a block diagram which shows an example of embodiment of the power transmission apparatus in the wireless power supply apparatus of this invention. The example which applied the power receiving apparatus in the wireless power feeder of this invention to a smart phone is shown, (a) is a top view, (b) is a back view. It is a top view which shows the other example of embodiment of the receiving device in the wireless electric power feeder of this invention. It is a model figure which shows the usage example of the wireless electric power feeder of this invention. It is a model figure which shows the usage example of the wireless electric power feeder of this invention. It is a model figure which shows the usage example of the wireless electric power feeder of this invention. It is a flowchart figure which shows the procedure which selects the power transmission coil in the power transmission apparatus of the wireless power feeder of FIG. It is a block diagram which shows the other example of embodiment of the power transmission apparatus in the wireless power supply apparatus of this invention. It is a block diagram which shows the other example of embodiment of the power transmission apparatus in the wireless power supply apparatus of this invention. It is a block diagram which shows the other example of embodiment of the power transmission apparatus in the wireless power supply apparatus of this invention. 11 is a table showing an example of data transmission history of an identifier recorded in a recording unit of the wireless power supply apparatus of FIG. 10. It is a flowchart figure which shows the procedure which selects the power transmission coil in the power transmission apparatus of the wireless power supply apparatus of FIG.

An example of an embodiment of the wireless power supply apparatus of the present invention will be described with reference to FIGS.
The wireless power feeding device includes a power transmitting device 1 having a power transmitting coil 10 and a power receiving device having a power receiving coil 30, and transmits power from the power transmitting device 1 in conjunction with the connection with the buckle side of the seat belt bracket when the seat belt is mounted. Wireless power supply to the power receiving device is performed.
The power transmission device 1 includes a plurality of power transmission coils 10 for power transmission, an external power supply unit 11 to which power is supplied from an in-vehicle battery, a power transmission circuit 12 that controls the power transmission coil 10 during power transmission, and power transmission by the power transmission coil 10. And a switching circuit 13 for switching between.

The power transmission circuit 12 includes a control unit 121, an AC signal generation unit 122, and a power transmission unit 123. The power transmission circuit 12 is connected to the plurality of power transmission coils 10 via the switching circuit 13 and transmits power from the selected one or more power transmission coils 10.
The AC signal generator 122 generates an electrical signal having a desired frequency necessary for resonance between the power transmission coil 10 and the power reception coil 30.
The power transmission unit 123 supplies AC power generated based on the signal generated by the AC signal generation unit 122 to the selected power transmission coil 10 via the switching circuit 13.

For example, as shown in FIG. 2, the power receiving device is configured by incorporating a power receiving circuit including a power receiving coil 30 in a portable electronic device (smartphone) 3 that uses power.
As illustrated in FIG. 3, the power receiving device 4 may be formed separately from the portable electronic device (smartphone) 3, and the power receiving device 4 may include a power receiving circuit including the power receiving coil 30. In this case, the portable electronic device (smartphone) 3 and the power receiving device 4 can be electrically connected to each other by bringing the terminals 5 and 5 included therein into contact with each other.

As shown in FIG. 4, the plurality of power transmission coils 10 are embedded in an in-vehicle seat belt 6. That is, when the user wears the seat belt, the power transmission coils 10 are arranged on the upper surface or the lower surface of the belt-shaped portion of the shoulder portion and the waist portion of the seat belt 6.
The power transmission coil 10 is formed of a material that can be bent, and does not hinder the winding of the seat belt 6 to the vehicle body side. Furthermore, the power transmission coil 10 formed on the seat belt 6 may be covered from the outside with a sheet made of another material, and it is preferable that the structure is such that the possibility of disconnection is reduced even when the seat belt 6 is handled violently.

According to this structure, the portable electronic device (smart phone) 3 incorporating the power receiving device is taken when the user takes the posture of operating the portable electronic device (smart phone) 3 while sitting on the seat of the automobile and wearing the seat belt 6. The power transmission coil 10 that directly faces is changed in accordance with the user's physique.
Therefore, by arranging the plurality of power transmission coils 10 on the seat belt 6, the power transmission coils can be arranged at various positions with respect to the power receiving device owned by the user seated on the seat of the automobile, and the power supply capability is high from among them. A power transmission coil can be obtained easily.

The power transmission device 1 including the power transmission circuit 12 is installed or embedded at an arbitrary position in the passenger compartment, and the power transmission circuit 12 to the plurality of power transmission coils 10 are connected via wirings 2, 2a, and 2b.
That is, as shown in FIG. 5, the connector for connection on the power transmission circuit 12 side is built in the buckle 7 side, and the connector for connection on the power transmission coil 10 side is fitted with a seat belt bracket (connecting bracket for coupling with the buckle) 8. Therefore, when the seat belt bracket 8 is coupled to the buckle 7, these two connectors are also coupled. Thereby, it can be set as the structure which can utilize wireless electric power feeding only when a user wears the seatbelt 6. FIG.

  Between the power transmission circuit 12 and the power transmission coil 10, a switching circuit 13 for supplying power only to the designated power transmission coil 10 selected by the control unit 121 of the power transmission circuit 12 is connected (FIG. 1). The switching circuit 13 may be disposed in any of the power transmission apparatus 1 including the seat belt bracket 8 side, the buckle 7 side, and the power transmission circuit 12 according to installation conditions such as a space.

Next, the operation of the wireless power feeder when the seat belt 6 is worn will be described with reference to FIGS. 6 and 7.
When the power transmission circuit 12 of the power transmission device 1 and the power transmission coil 10 are connected when wearing the seat belt, the power transmission circuit 12 starts searching for the presence or absence of a power supply target device (for example, the portable electronic device 3 incorporating the power receiving device) (see FIG. 6) In the procedure shown in FIG. 7, processing for selecting one or a plurality of distribution coils 10 from the plurality of distribution coils 10 is performed.
During the search, the control unit 121 of the power transmission circuit 12 controls the switching circuit 13 to supply power to the plurality of power transmission coils 10 one by one. When power is supplied to an arbitrary power transmission coil 10, the power transmission circuit 12 measures the power supply capability via the power transmission coil for a certain period of time.

  That is, when the seat belt bracket 8 side and the buckle 7 side are coupled (step 40), driving of the power transmission circuit 12 is started (step 41), and sequentially from a power transmission coil in a predetermined order (for example, a position close to the user's shoulder). The power transmission coil 10 is selected (step 42), power transmission for search is started with respect to the selected power transmission coil 10 (step 43), and the power supply capability of the selected power transmission coil 10 is measured. Is performed (step 44).

  As an index for determining the superiority of the power supply capability, parameters such as transmission power, power transmission efficiency calculated based on feedback of the power reception state from the power reception circuit on the power receiving device, and a combination of transmission power and power transmission efficiency are employed.

Further, in the power transmission coil 10 being measured, the power transmission circuit 12 may adjust the resonance frequency based on the measurement result of the power supply capability, perform a process for improving the power supply capability, and measure the power supply capability again. .
Further, a function of communicating with the power receiving device side may be provided, and the power transmission capability may be measured again by adjusting the transmitted power according to the power control information exchanged between the power transmission device 1 and the power receiving device.

  Next, the power transmission circuit 12 controls the switching circuit 13 so as to switch power feeding to the adjacent power transmission coil 10 to similarly measure the power feeding capability via the power transmission coil. When this is performed for all the power transmission coils 10 embedded in the seat belt 6 (step 45), it is determined whether or not there is a power transmission coil that exceeds a predetermined threshold value (step 46). If there is no power transmission coil exceeding the threshold, power transmission coil selection is performed again (step 42).

  If there is a power transmission coil that exceeds a predetermined threshold value, the power transmission circuit 12 selects the power transmission coil 10 having the highest power supply capability (step 47), and supplies power to the power receiving device (step 48).

  As a means of obtaining feedback from the power receiving circuit of the power receiving device, in-band communication using a load modulation method that can operate simultaneously with power transmission, wireless LAN based on the IEEE802.11 standard, or short-range wireless communication based on the IEEE802.15 standard It can be realized by out-of-band communication.

  Measurement of the power supply capacity of the selected power transmission coil 10 is continuously performed at regular time intervals (step 49). For example, along with a change in the posture of the user sitting on the seat or a change in the relative position of the user and the smartphone, When the power transmission circuit 12 detects that the power supply capacity falls below a predetermined threshold value (step 50), it is determined that the power transmission coil is not optimal, and the search by a plurality of power transmission coils is re-executed (step 42).

When a power transmission coil 10 having a high power supply capacity is found, the power supply coil 10 is switched to power supply.
When it is determined that there is no power transmission coil 10 having a high power supply capability, the power transmission circuit 12 periodically searches for a power supply target device.

The power transmission coil 10 is embedded in the inner lining of the vehicle door, the inner lining of the pillar on the vehicle body side, the back of the driver seat or the passenger seat, and the like, instead of the arrangement of the seat belt 6. May be the search target.
In addition, since the non-optimal power transmission coil 10 is not energized and does not transmit power, the influence on the human body and peripheral devices due to unnecessary electromagnetic noise radiation can be suppressed.

Another example of the embodiment of the wireless power supply apparatus of the present invention will be described with reference to FIG.
The wireless power supply apparatus of FIG. 8 transmits power from the power transmission apparatus 1 in conjunction with the connection with the buckle side of the seat belt bracket when the seat belt is mounted, similarly to the wireless power supply apparatus of FIG. Wireless power feeding to the portable electronic device 3).

In the embodiment of FIG. 1, the trigger for driving the power transmission circuit is a physical coupling between the connectors attached to both the seat belt bracket 8 and the buckle 7, whereas in the embodiment of FIG. 8, the power transmission circuit A seat belt wearing sensor 51 is used as a trigger for driving the motor 12. Differences from the wireless power supply apparatus of FIG. 1 will be mainly described. Parts having the same configuration as in FIG. 1 are denoted by the same reference numerals.
As in FIG. 1, the wireless power feeding apparatus is configured by previously connecting a power transmission circuit 12, a switching circuit 13, and a plurality of power transmission coils 10.

  The seating / seat belt wearing sensor 51 detects the seating of the user and the wearing of the seat belt 6, and transmits the detected wearing signal to an ECU (Electronic Control Unit) 52 that manages various controls in the automobile. The ECU 52 uses the reception of the wearing signal as a trigger to transmit a signal for starting power supply necessary for driving the power transmission circuit 12 to the external power supply unit 11 to the power transmission circuit 12. Thereafter, the procedure of searching the power transmission circuit 12 for the power transmission coil 10 having a high power feeding capability and starting the power transmission to the power receiving device is the same as that of the wireless power feeding device of FIG.

Another example of the embodiment of the wireless power supply apparatus of the present invention will be described with reference to FIG.
The wireless power supply apparatus of FIG. 9 prepares a plurality of pairs of one power transmission circuit 12 and one power transmission coil 10 (integrated power transmission circuit and power transmission coil) with respect to the wireless power supply apparatus of FIG. 12 is selected. Differences from the wireless power supply apparatus of FIG. 1 will be mainly described. Parts having the same configuration as in FIG. 1 are denoted by the same reference numerals.

In the wireless power supply apparatus of FIG. 9, the power transmission coil 10 is connected in the immediate vicinity of the power transmission circuit 12 and is integrally handled, and a plurality of these are prepared. Each power transmission circuit 12 is connected to a common control circuit 14 via a switching circuit 13.
The control circuit 14 has a function of communicating with each power transmission circuit 12. The power transmission circuit 12 transmits information related to the power transmission status to the control circuit 14, and the control circuit 14 receives the information.

As information related to the power transmission status, other parameters such as power transmission efficiency calculated based on measured transmission power or feedback of power reception status from the power receiving circuit, or a combination of transmission power and power transmission efficiency are used as indicators for selection. Also good.
The control circuit 14 has a function of selecting one or a plurality of power transmission circuits 12 to be used for power transmission from the plurality of power transmission circuits 12.

Next, another example of the embodiment of the wireless power supply apparatus of the present invention will be described with reference to FIG.
The wireless power supply apparatus of FIG. 10 is obtained by adding a function of shortening the time for searching and selecting a power transmission coil having a high power supply capacity to the wireless power supply apparatus of FIG.

  That is, in the power transmission device 1 of FIG. 1, the recording unit 15 that retains the history of the power transmission coil 10 used during power transmission, and the power transmission / reception device communication unit 16 that transmits and receives identifier information between the power transmission device 1 and the power reception device. It is configured by adding. The recording unit 15 records an identifier for identifying a power receiving device to be fed in combination with an identifier of the power transmission coil 10.

  In this case, the power receiving device on the mobile electronic device 3 side has an identifier recognition unit that acquires the power receiving device identifier of the power receiving device itself, and notifies the power transmitting device 1 between the power transmitting and receiving device communication unit 16 of the power receiving device identifier. An identifier communication unit is provided.

  As a means for notifying the identifier of the power receiving device to the communication unit 16 between the power transmitting and receiving apparatus and the content of the identifier, for example, a wireless LAN based on the IEEE802.11 standard or a short-range wireless communication based on the IEEE802.15 standard is used as a notification means. A MAC (Media Access Control) address may be used as an identifier. Alternatively, the MAC address may be notified between the power transmission and reception coils by using in-band communication by a load modulation method that can operate simultaneously with power transmission as a notification means.

After power supply to the power receiving device is completed, the power transmission circuit 12 records, as shown in FIG. 11, the combination information of the identifiers of the top N power transmission coils 10 having a high power supply capability and high usage frequency and the identifiers of the power receiving device. Record in 15.
Next time, when the power receiving device is brought into the car and the seat belt 6 is worn, the power transmitting / receiving device communication unit 16 activates the communication function of the identifier communication unit of the power receiving device, and acquires the power receiving device identifier from the power receiving device. .

  Next, a procedure for selecting one or a plurality of distribution coils 10 from the plurality of distribution coils 10 in the wireless power supply apparatus of FIG. 10 will be described with reference to FIG.

When the seat belt bracket 8 side and the buckle 7 side are coupled (step 60), driving of the power transmission circuit 12 is started (step 61). The power transmission circuit 12 refers to the recording unit 15 and the received power device identifier received in the past has been registered. Whether or not there is power transmission history information is determined (step 62).
When there is no power transmission history information (power receiving device identifier) in the recording unit 15, the processing after step 42 of power transmission coil selection in FIG. 7, that is, the search for the power transmission coil 10 with high power supply capability for all the power transmission coils 10 is executed. (Step 63).

  If there is power transmission history information (if registered), it is assumed that the user of the power receiving device is the same as the user who was used last time, and the N most frequently used power transmission history information is acquired from the recording unit 15 (step 64). An upper power transmission coil is selected (step 65), power transmission for search is started with respect to the selected power transmission coil 10 (step 66), and the power supply capacity of the selected power transmission coil 10 is measured (step). 67).

  The index for determining the superiority of the power supply capability is the same as that described in the wireless power supply apparatus of FIG. 1, and parameters such as transmission power, power transmission efficiency, and a combination of transmission power and power transmission efficiency are employed. Further, as described above, the power supply capacity may be measured again by adjusting the resonance frequency and the transmission power.

When measurement is performed for the top N power transmission coils 10 in which a power transmission history exists (step 68), it is determined whether there is a power transmission coil that exceeds a predetermined threshold value (step 69).
When there is no power transmission coil that exceeds the threshold, the power transmission circuit 12 searches for a power transmission coil having a high power supply capability for all power transmission coils, and the power transmission circuit periodically searches for a power supply target device (step 63).

  When there is a power transmission coil that exceeds a predetermined threshold value, the power transmission circuit 12 selects the power transmission coil 10 having the highest power supply capability among them (step 70), and supplies power to the power receiving device (step 70). Step 71).

  The measurement of the power supply capacity of the selected power transmission coil is continued (step 72). For example, the power supply capacity is designated in advance in accordance with the change in the posture of the user sitting on the seat or the relative position of the user and the smartphone. When the power transmission circuit 12 detects that the value is below the threshold (step 73), it is determined that the power transmission coil is not optimal, and the search using a plurality of power transmission coils is performed again (step 65).

According to each wireless power supply apparatus described above, the following effects can be obtained.
(1) When a plurality of power transmission coils 10 are pre-embedded or attached to members in the vicinity of the user such as the seat belt 6, the door lining, and the back of the seat, the seat belt 6 expands and contracts according to the user's physique, or the user Even when the attitude of the power supply changes, power can be transmitted from the power transmission coil 10 having a high power supply capability to the power supply target device (the portable electronic device 3 incorporating the power receiving device).

(2) By selecting the power transmission coil (one or more) 10 having a high power supply capacity, the unselected power transmission coils 10 are not energized and do not transmit power, so that unnecessary electromagnetic noise radiation affects the peripheral devices. Can be suppressed.

(3) By providing the recording unit 15 and the power transmission / reception device communication unit 16, the usage history of the power transmission coil 10 with respect to the power reception device is maintained, and the power supply to the same power reception device is referred to the history after the next time. In addition, it is possible to shorten the time from when the power transmission coil 10 having a high power supply capability is selected to start power supply.

(4) By transmitting the power transmission coil 10 and the power transmission device 1 (feeding base body) separately and connecting them with the wiring 2, even when the position where the power feeding base can be attached is restricted in the vehicle, power is transmitted to the vicinity of the user. It becomes possible to do.

(5) Even when only a power transmission distance of about the diameter of the power transmission coil 10 and the power reception coil 30 can be secured, by transmitting power from the power transmission coil 10 mounted in the vicinity of the passenger in the vehicle, such as the seat belt 6, It becomes possible to transmit power while holding and operating the portable electronic device 3) incorporating the device.

(6) By using a mechanism in which the power supply target device (the portable electronic device 3 incorporating the power receiving device) cannot be charged unless the seat belt 6 is attached, it is possible to lead to the safety guidance of the passenger.

  DESCRIPTION OF SYMBOLS 1 ... Power transmission apparatus, 2 ... Wiring, 3 ... Portable electronic device (smartphone), 4 ... Power receiving apparatus, 6 ... Seat belt, 7 ... Buckle, 8 ... Seat belt metal fitting, 10 ... Power transmission coil, 11 ... External power supply part, 12 DESCRIPTION OF SYMBOLS ... Power transmission circuit, 13 ... Switching circuit, 14 ... Control circuit, 15 ... Recording part, 16 ... Communication part between power transmission / reception apparatuses, 30 ... Power reception coil, 121 ... Control part, 123 ... Power transmission part.

Claims (11)

A wireless power feeder that supplies power from a power transmission device to a power receiving device using magnetic resonance,
The power transmission device is:
A power transmission circuit that supplies power to the power receiving device by supplying power; and
A plurality of power transmission coils connected to the power transmission circuit;
A switching circuit for switching the power supply via the selected power transmission coil;
With
The power transmission circuit is:
A wireless power supply apparatus comprising: a control unit that sequentially supplies power to each power transmission coil, measures each power supply capability, and searches for and selects a power transmission coil having a high power supply capability. The controller is
A communication unit between power transmitting and receiving devices for receiving an identifier of the power receiving device from a power receiving device to be powered;
A recording unit that holds usage history information that includes a combination of the usage frequency of the identifier of the power receiving device that is the power supply target in the past and the identifier of the power transmission coil that was used at that time;
Further comprising
When a power transmission circuit is newly driven, a power transmission coil with a high power supply capability is selected from among the top usage frequencies when the identifier of the power receiving device is registered in the usage history information with reference to the identifier of the power receiving device and the usage history information. The wireless power supply apparatus according to claim 1, wherein the search for the wireless power supply is started. Each said power transmission coil is arrange | positioned at the belt-shaped part of the seatbelt installed in the room | chamber interior of a motor vehicle, and transmits power from the power transmission coil of the position where the power supply capability with respect to the said receiving device is high according to the physique and attitude | position of the seated user Item 4. The wireless power feeder according to Item 1. The seat belt includes a seat belt fitting that fits into a buckle installed in the room when the seat belt is worn,
A power transmission coil side connector is attached to the seat belt bracket, and a power transmission circuit side connector is attached to the buckle.
The wireless power feeder according to claim 3, wherein the power transmission coil side connector and the power transmission circuit side connector are coupled with each other in conjunction with the coupling of the seat belt and the buckle to energize the power transmission coil.   A sensor that detects seating of a user and wearing of a seat belt, and an ECU (Electronic Control Unit) that receives a signal detected by the sensor, and the ECU is triggered by reception of the signal with respect to the power transmission circuit The wireless power feeder according to claim 3 or 4, further comprising means for transmitting a signal for starting power supply required for driving the power transmission circuit. Each of the power transmission coils is arranged on the vehicle body side in the lining of the door of the automobile or in the lining of the vehicle body pillar, and transmits power from a power transmission coil having a high power supply capability to the power receiving device according to changes in the physique and posture of the seated user. The wireless power feeder according to claim 1. 2. The power transmission coil according to claim 1, wherein each power transmission coil is disposed in a driver seat or a passenger seat of an automobile and transmits power from a power transmission coil having a high power supply capability with respect to the power receiving device according to a change in a physique or posture of a seated user. Wireless power feeder. A wireless power feeder that supplies power from a power transmission device to a power receiving device using magnetic resonance,
The power transmission device is:
A plurality of power transmission circuits integrated with a power transmission coil to supply power to the power receiving device,
A switching circuit for switching via the selected power transmission circuit;
A control unit is provided that sequentially supplies power to each power transmission circuit, measures each power supply capability, searches for a power transmission circuit with high power supply capability, and selects one or a plurality of power transmission circuits used for power transmission. Wireless power supply device. The controller is
A communication unit between power transmitting and receiving devices for receiving an identifier of the power receiving device from a power receiving device to be powered;
A recording unit that holds usage history information that includes a combination of the usage frequency of the identifier of the power receiving device that is the power supply target in the past and the identifier of the power transmission coil that was used at that time;
Further comprising
When a power transmission circuit is newly driven, the power receiving circuit with the highest power supply capability is selected from among the highest usage frequencies when the identifier of the power receiving device is registered in the usage history information with reference to the identifier of the power receiving device and the usage history information. The wireless power supply apparatus according to claim 8, wherein the search for the wireless power supply is started. The power transmission circuit is disposed in a belt-like portion of a seat belt installed in a room of an automobile, and transmits power from a power transmission coil having a high power supply capability with respect to the power receiving device according to a change in a physique or posture of a seated user. The wireless power supply apparatus described. A power receiving device for supplying power from a power transmission device using magnetic resonance,
An identifier recognition unit for acquiring an identifier of the power receiving device;
A wireless power receiving apparatus comprising: an identifier communication unit for notifying the power transmission apparatus of the identifier.