JP2015027172A - Contactless charger and vehicle having the same mounted therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contactless charger in which a metal foreign material can be properly detected when the metal foreign material is put on a mount plate, and a vehicle having the contactless charger mounted therein.SOLUTION: After the position of a portable terminal 15 is confirmed by a position detection coil 14, a foreign material detection signal is applied to the position detection coil 14 at plural times at predetermined intervals, and an echo signal from the portable terminal 15 under application of each foreign material detection signal is detected by the position detection coil 14, and stored in a memory 10a. Next, the metal foreign material on the mount plate 6 is detected on the basis of the variation of the echo signal stored in the memory 10a.

Description

  The present invention relates to a non-contact charging device for charging a portable terminal such as a mobile phone, and an automobile equipped with the same.

  The functions of portable terminals such as cellular phones have become extremely high, and power consumption has increased accordingly.

  Accordingly, it is required to be able to charge at various places including inside the automobile, and as a recent trend, so-called non-contact charging without using a cable is in the spotlight.

  And the following are proposed as a non-contact charging device which meets such a demand.

  That is, a main body case having an installation plate on the upper surface, a position detection coil for detecting the position of the mobile terminal installed on the installation plate, and a lower side of the installation plate. The configuration includes a charging coil and a control unit connected to the charging coil and the position detection coil (for example, see Patent Document 1 below).

JP 2009-247194 A JP 2009-33782 A

  In the above-described conventional example, the position of the portable terminal existing on the upper surface of the installation plate is detected by the position detection coil, and the charging coil is moved to the detection location to perform efficient charging.

  The problem with such a non-contact charging device is that when a metal foreign object such as a coin is placed on the upper surface of the installation plate and a portable terminal is placed on the metal foreign material, the metal made by the magnetic flux from the charging coil. That is, the temperature of the foreign matter will rise.

  Thus, there has been proposed a method in which a waveform detection circuit is connected to a charging coil and foreign matter detection is performed when a predetermined value obtained from this waveform exceeds a threshold value (for example, Patent Document 2).

  However, since the type of portable terminal placed on the installation board, particularly the shape of the portable charging coil, is greatly different, the predetermined value obtained from the waveform also varies greatly.

  That is, in such a conventional example, it is effective for charging a portable terminal whose type, in particular, the shape of the portable charging coil, etc. is known in advance. May not function properly.

  Therefore, an object of the present invention is to allow the foreign object detection function to function properly even when a plurality of types of portable terminals are used.

  In order to achieve this object, the present invention detects the position of the main body case having the installation plate on the upper surface and the installation plate or the lower side thereof, and the mobile terminal installed on the upper surface of the installation plate. The position detection coil and the installation plate or a charging coil that is arranged below the installation plate and charges the portable terminal installed on the upper surface of the installation plate, and a control connected to the charging coil and the position detection coil And a memory connected to the control unit. The control unit applies a foreign object detection signal to the position detection coil a plurality of times at predetermined intervals after confirming the position of the mobile terminal by the position detection coil. The echo signal from the portable terminal at the time of applying the detection signal is detected by the position detection coil and stored in the memory, and then based on the change state of the echo signal stored in the memory, And configured to perform foreign object detection on plate, thereby it is to achieve the intended purpose.

  As described above, the present invention includes a main body case in which an installation plate is arranged on the upper surface, a position detection coil that detects the position of the portable terminal installed on the installation plate or the lower side of the installation plate. A charging coil for charging the mobile terminal installed on the installation plate or the installation plate and on the upper surface of the installation plate; a control unit connected to the charging coil and the position detection coil; and A memory connected to the control unit, and after confirming the position of the mobile terminal by the position detection coil, the control unit applies a foreign object detection signal to the position detection coil a plurality of times at predetermined intervals, and applies each foreign object detection signal. The echo signal from the portable terminal at the time is detected by the position detection coil and stored in the memory, and then the foreign object on the installation plate is detected based on the change state of the echo signal stored in the memory. Having configured to perform, against the use of plural kinds of portable terminals, so foreign object detection function to function properly.

  That is, in the present invention, after the position detection coil confirms the position of the portable terminal, the foreign substance detection signal is applied to the position detection coil a plurality of times at predetermined intervals, and the echo signal from the portable terminal at the time of applying each foreign substance detection signal. Is detected by the position detection coil and stored in the memory, and then the metallic foreign matter on the installation plate is detected based on the change state of the echo signal stored in the memory.

  Even in the above configuration, the value of the echo signal obtained from the mobile terminal after application of each foreign object detection signal is different for each of a plurality of types of mobile terminals. However, since the change in the echo signal becomes large, the foreign object is detected based on the magnitude of the change.

  In this way, foreign object detection can be appropriately performed even when multiple types of portable terminals are used.

The perspective view which shows the state which installed the contactless charging device of one Embodiment of this invention in the vehicle interior of a motor vehicle Same perspective view Same perspective view The perspective view which shows the state which removed the same part Plan view showing a state where the same part is removed Cross section The perspective view which shows the state which removed the same part Plan view showing a state where the same part is removed Same control block diagram Same operation flowchart Operation explanation diagram Operation explanation diagram Operation explanation diagram Operation explanation diagram Operation explanation diagram Operation explanation diagram Same operation flowchart

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1)
In FIG. 1, a handle 3 is installed in front of the interior 2 of the automobile 1.

  On the side of the handle 3, an electronic device 4 that displays music, video playback, car navigation video, and the like is installed.

  Further, a contactless charging device 5 is installed behind the electronic device 4 in the vehicle 2.

  As shown in FIGS. 2 to 8, the contactless charging device 5 is a box-shaped main body case 7 in which an installation plate 6 is disposed on the upper surface, and is opposed to the lower surface side of the installation plate 6 in the main body case 7. A charging coil 8 that is movable in a horizontal direction in a state, a driving unit 9 that moves the charging coil 8 in a horizontal direction opposite to the lower surface side of the installation plate 6, and a connection to the driving unit 9 and the charging coil 8 And a control unit (10 in FIG. 9).

  Hereinafter, each part will be described in detail.

  First, the installation plate 6 will be described.

  As shown in FIG. 7, the installation plate 6 has a configuration in which a front plate 11, a middle plate 12, and a back plate 13 are polymerized.

  The front plate 11 and the back plate 13 are made of synthetic resin, and the intermediate plate 12 is made of ceramic. That is, the configuration is such that the magnetic flux from the charging coil 8 can pass through the installation plate 6 in the direction of the portable terminal 15 in FIG.

  Further, a position detection coil 14 (an example of position detection means) in FIG. 9 is provided on the surface of the intermediate plate 12.

  This position detection coil 14 is used in Patent Document 1 (Japanese Patent Laid-Open No. 2009-247194), and the portable terminal 15 is placed at any position on the upper surface of the installation plate 6 as shown in FIG. It is to detect.

  In the present embodiment, the position detection coil 14 is used to detect at which position on the upper surface of the installation plate 6 the portable terminal 15 is placed as shown in FIG. The mobile terminal 15 is moved to a position facing a mobile charging coil (not shown) of the mobile terminal 15.

  Next, the charging coil 8 portion will be described.

  As can be understood from FIGS. 4 and 5, the charging coil 8 has a configuration in which a lead wire is wound in an annular shape a plurality of times, and the outer peripheral side and the lower surface side thereof are covered with a synthetic resin holder 16. Held in a broken state.

  Further, as shown in FIG. 7, support legs 17 extending downward from the charging coil 8 are integrally formed on the lower surface of the holder 16 with synthetic resin.

  In addition, since a gap of 0.3 mm is provided between the lower surface of the support leg 17 and the upper surface of the metal support plate 18 disposed below the support leg 17, in a normal state, When the charging coil 8 is moved, the lower surface of the support leg 17 does not contact the upper surface of the support plate 18.

  In the above configuration, the support leg 17 is provided below the charging coil 8 in the present embodiment.

  A control substrate 19 and a lower surface plate 20 of the main body case 7 are disposed below the support plate 18. The control substrate 19 is disposed between the lower surface of the support plate 18 and the upper surface of the lower surface plate 20. A penetrating support 21 is provided.

  Next, the drive unit 9 will be described.

  As shown in FIGS. 4 and 5, the drive unit 9 includes an X-axis direction drive shaft 22 and a Y-axis direction drive shaft 23, and the X-axis direction drive shaft 22 and the Y-axis direction drive shaft 23 Each intermediate portion is engaged with the holding body 16 outside the charging coil holding portion of the holding body 16.

  In other words, in the holding body 16, a through hole (not shown) through which the X-axis direction drive shaft 22 penetrates and a through hole 24 through which the Y-axis direction drive shaft 23 penetrates are crossed at a predetermined interval vertically. The X-axis direction drive shaft 22 and the Y-axis direction drive shaft 23 penetrate there, and are in an engaged state.

  A worm wheel 25 is provided on one end side of the X-axis direction drive shaft 22, a gear 26 is provided on one end, and a gear 26 is provided on the other end.

  The worm wheel 25 is engaged with a worm 27, and the worm 27 is connected to a motor 28.

  The gears 26 on both sides are engaged with gear plates 29, respectively.

  For this reason, when the motor 28 is driven, the worm 27 is rotated, whereby the worm wheel 25 is moved in the X-axis direction together with the X-axis direction drive shaft 22, and the charging coil 8 is thereby moved in the X-axis direction. It will be.

  A worm wheel 30 is provided on one end side of the Y-axis direction drive shaft 23, a gear 31 is provided on one end, and a gear 31 is provided on the other end.

  The worm wheel 30 is engaged with a worm 32, and the worm 32 is connected to a motor 33.

  The gears 31 on both sides are engaged with the gear plate 34, respectively.

  For this reason, when the motor 33 is driven, the worm 32 is rotated, whereby the worm wheel 30 is moved in the Y-axis direction drive shaft 23 and the Y-axis direction, whereby the charging coil 8 is moved in the Y-axis direction. It becomes.

  4 is a flexible wiring for energizing the charging coil 8, and the end of the flexible wiring 35 is fixed to the side surface of the support leg 17 described above.

  Further, as shown in FIG. 9, a motor 28 is connected to the control unit 10 via an X-axis motor control unit 36, and a motor 33 is connected to the control unit 10 via a Y-axis motor control unit 37.

  In addition, the charging coil 8 is connected to the control unit 10 via the charging coil control unit 38, and the position detection coil 14 is connected to the position detection coil 14 via the detection coil control unit 39.

  In the configuration as described above, in this embodiment, when the power switch 40 provided on the outer periphery of the installation plate 6 of the main body case 7 shown in FIG. 4 to 6 are moved to the center of the installation plate 6 (hereinafter referred to as point A) of the main body case 7 (S2 in FIG. 10), and then the power is turned off (S3 in FIG. 10). .

  That is, as shown in FIG. 2, when the portable terminal 15 is not placed on the installation plate 6 of the main body case 7, the installation plate 6 is exposed in the vehicle interior 2 as shown in FIG. 1.

  For this reason, a situation may occur in which the user accidentally touches the installation plate 6, and at this time, the installation plate 6 is overloaded.

  Therefore, in this embodiment, as shown in FIGS. 4 to 6, the charging coil 8 is moved to the center of the main body case 7, and the above-described excessive weight is charged to the charging coil 8, the holding body 16, the support legs 17, and the support plate 18. It is supported by.

  In other words, when such an overload is placed on the installation plate 6, the installation plate 6 is slightly bent downward, but in this state, the charging coil 8, the holding body 16, and the support leg 17 also move downward. The lower surface of the support leg 17 comes into contact with the upper surface of the support plate 18.

  As a result, the excessive weight is supported by the support plate 18 via the installation plate 6, the charging coil 8, the holding body 16, and the support legs 17, so that the installation plate 6 and the charging coil 8 can be prevented from being damaged. Become.

  In the present embodiment, the lower surface side of the support plate 18 is supported on the lower surface plate 20 of the main body case 7 via the support body 21 in order to increase the strength against excessive weight.

  Further, when such excessive weight is removed, the installation plate 6 elastically returns upward, and the charging coil 8 and the holding body 16 also return upward by elastic return of the X-axis direction drive shaft 22 and the Y-axis direction drive shaft 23. Therefore, the lower surface of the support leg 17 is placed on the upper surface of the support plate 18 with a gap.

  For this reason, it does not become an obstacle at the time of subsequent charging coil 8 movement.

  When the mobile terminal 15 is charged, first, the power switch 40 is turned on (S4 in FIG. 10), and the mobile terminal 15 is placed on the upper surface of the installation board 6.

  Even in this state, in the present embodiment, first, it is confirmed by the control unit 10 whether or not the charging coil 8 exists at the point A (S5 in FIG. 10).

  This confirmation can be determined from the drive amounts of the motors 28 and 33 stored in the X-axis motor control unit 36 and the Y-axis motor control unit 37.

  If it is determined that the charging coil 8 does not exist at the point A, the control unit 10 moves the charging coil 8 to the point A (S6 in FIG. 10). (S7 in FIG. 10).

  Next, the control unit 10 uses the position detection coil 14 to detect whether the portable terminal 15 is placed at any position on the upper surface of the installation plate 6 as shown in FIG. 3 (S8 and S9 in FIG. 10). .

  The place where the mobile terminal 15 is placed is actually the place of a mobile charging coil (not shown) built in the mobile terminal 15.

  Thereafter, the control unit 10 drives the motors 28 and 33 via the X-axis motor control unit 36 and the Y-axis motor control unit 37 to the detected position of the mobile charging coil (not shown) held by the mobile terminal 15. The charging coil 8 is moved (S10 in FIG. 10), and then charging is started via the charging coil control unit 38 (S11, S12 in FIG. 10).

  Further, during this charging, it is determined whether or not the continuation of charging is necessary (whether charging is completed or not) by the same operation as that of Patent Document 1 (Japanese Patent Laid-Open No. 2009-247194) (see FIG. 10). S13) When the charging is completed (fully charged), the control unit 10 ends the charging operation (S14 in FIG. 10).

  When such a charging operation is completed, the controller 10 checks whether or not the charging coil 8 exists at the point A (S15 in FIG. 10), and then returns the charging coil 8 to the point A ( S6 in FIG.

  This confirmation can be determined from the drive amounts of the motors 28 and 33 stored in the X-axis motor control unit 36 and the Y-axis motor control unit 37.

  If the control unit 10 cannot return the charging coil 8 to the point A, for example, the driving of the motors 28 and 33 stored in the X-axis motor control unit 36 and the Y-axis motor control unit 37 due to some impact during operation. When the position calculated from the quantity and the actual position measured by the position detection coil 14 are deviated, the operation of FIG. 8 is executed.

  That is, the control unit 10 drives the motors 28 and 33 via the X-axis motor control unit 36 and the Y-axis motor control unit 37 to move the charging coil 8 to the corner in the main body case 7.

  The switches 41 and 42 exist in the corner portion, and when the charging coil 8 moves to the corner in the main body case 7, these switches 41 and 42 are operated. It is determined that the initial value has been moved.

  In this state, the operation amounts of the motors 28 and 33 by the X-axis motor control unit 36 and the Y-axis motor control unit 37 are also set to initial values, and the position control is performed again from here.

  Further, as shown in FIG. 9, the position detection coil 14 (foreign matter detection means) and a foreign matter alarm section (FIGS. 2, 3, and 3) that issues a warning when a foreign matter is detected by the position detection coil 14 (foreign matter detection means). 9 43) and the memory 10 a are connected to the control unit 10.

  In other words, the control unit 10 is configured to detect the metal foreign object with the position detection coil 14 and drive the foreign object alarm unit 43.

  Hereinafter, this point will be described in detail.

  The foreign matter alarm unit 43 is connected to the control unit 10 as shown in FIG. 9, and is mounted on the main body case 7 as shown in FIGS.

  Further, the position detection coil 14 is connected to the control unit 10 to which the foreign object alarm unit 43 is connected via the detection coil control unit 39.

  Further, as shown in FIGS. 2 and 3, the main body case 7 portion on the outer periphery of the installation plate 6 is provided with an upper projecting portion 7 a that projects upward from the installation plate 6. An alarm unit 43 and a power switch 40 are provided.

  That is, when the automobile 1 is driven, the mobile terminal 15 receives vibrations and inertial forces associated with the driving. Therefore, the upper case 7 a is provided in the body case 7 portion on the outer periphery of the installation plate 6, and the mobile terminal 15 is charged when the mobile terminal 15 is charged. This prevents the 15 from falling outside the main body case 7.

  However, when the upper protrusion 7a is provided on the main body case 7 portion on the outer periphery of the installation plate 6 in this way, a depression is present on the upper surface of the main body case 7, so that the driver or passenger can That is, metal foreign matters such as coins are also placed on the upper surface of the installation plate 6.

  When charging is started with the portable terminal 15 placed on the foreign object, the temperature of the coin, which is a foreign object, rises due to the magnetic flux supplied from the charging coil 8.

  Therefore, in the present embodiment, even when a metal foreign matter such as a coin is placed on the upper surface of the installation plate 6 and charging is started with the portable terminal 15 placed thereon, In order to suppress the temperature rise, this point will be specifically described below.

  In the present embodiment, as described above, after the control unit 10 shown in FIG. 9 confirms the position of the mobile terminal 15 by the position detection coil 14, the motor is transmitted via the X-axis motor control unit 36 and the Y-axis motor control unit 37. 28 and 33 are driven, and the charging coil 8 is moved to the position of the detected mobile charging coil (not shown) possessed by the mobile terminal 15 (S10 in FIG. 10), and then via the charging coil control unit 38. Charging is started (S11 and S12 in FIG. 10).

  In such a configuration, the present embodiment is characterized in that the operation of FIG. 17 is interposed between S10 and S11 of FIG. 10 as the operation of the control unit 10 in order to detect a metallic foreign object. It has become.

  Also in FIG. 17, S10 and S11 in FIG. 10 are denoted by S10 and S11 in FIG. 17 in order to clarify the relationship with FIG.

  In this embodiment, as shown in FIG. 11, in order to detect such a metal foreign object, for example, a pulse (a) of 1 MHz is applied to the position detection coil 14 as a foreign object detection signal at a predetermined interval. 11 (only one is shown in FIG. 11), but after a predetermined time, the pulse in FIG. 11 is applied to the position detection coil 14 as a foreign object detection signal).

  At this time, since the position detection coil 14 and the mobile charging coil (not shown) possessed by the mobile terminal 15 are opposed to each other, an echo signal as shown in FIG. The position detection coil 14 detects the position.

  As shown in FIG. 11C, the control unit 10 holds the peak of the echo signal detected by the position detection coil 14, converts the analog value at that time into a digital signal, and stores it in the memory 10a.

  In other words, as shown in FIG. 12, when a pulse (a) of 1 MHz, for example, is applied as a foreign object detection signal from the control unit 10 to the position detection coil 14 in order to detect such a metallic foreign object, ( The echo signal as in a) returns from the portable charging coil of the portable terminal 15 to the position detecting coil 14, and this is charged in the capacitor 44 of FIG.

  Thus, the peak hold of the echo signal can be performed.

  In FIG. 12, a transistor 45 (an example of a switching element) is ON / OFF controlled by the control unit 10. In the ON state, an echo signal detected by the position detection coil 14 flows to the transistor 45, and the capacitor 44 The battery is not charged.

  On the other hand, when the transistor 45 is turned off by the control unit 10, the echo signal detected by the position detection coil 14 is charged in the capacitor 44.

  Thus, while the transistor 45 is OFF, the capacitor 44 is continuously charged. As a result, as shown in FIGS. 13B and 11C, the echo signal detected by the position detection coil 14 is not detected. Peak hold can be performed.

  The control unit 10 converts the voltage value of the capacitor 44 into a digital signal and stores it in the memory 10a.

  Subsequently, the control unit 10 turns on the transistor 45, discharges the capacitor 44, and again detects, for example, a 1 MHz pulse as a foreign object detection signal in the position detection coil 14 in order to detect a metallic foreign object. Apply (a).

  Then, echo signals as shown in FIGS. 13A and 11B return from the mobile charging coil of the mobile terminal 15 to the position detection coil 14, but at this time, since the transistor 45 is not yet turned off, Charging to 44 is not started. That is, the peak hold of the echo signal has not yet started.

  In the present embodiment, the controller 10 gradually delays the time until the peak hold is started after applying a pulse (a) of 1 MHz, for example, as a foreign substance detection signal to the position detection coil 14 every time.

  That is, the controller 10 delays the timing (time) for turning off the transistor 45 in FIG. 12 every time after applying a pulse (a) of 1 MHz, for example, as a foreign object detection signal to the position detection coil 14. .

  As a result, the peak hold value detected by the control unit 10 is as shown in FIG.

  FIG. 14 shows the result of foreign object detection using five mobile terminals 15 with different shapes of mobile charging coils.

  That is, the controller 10 applies a 1 MHz pulse (a), for example, as a foreign object detection signal to the position detection coil 14, and the peak time is high before the peak hold starts. The result shows that the peak value decreases as the start time is delayed.

  This can be understood from the actually measured waveform shown in FIG. 13 (a). Since the echo signal gradually attenuates, the peak value is high when the time until the peak hold starts is early, and the peak hold is If the start time is late, the peak value will be smaller.

  13 and 14 show actual measurement values when a foreign object detection signal is issued in a state where the portable terminal 15 is placed on the upper surface of the installation plate 6 (a state where there is no metal foreign object such as a coin).

  On the other hand, FIGS. 15 and 16 are actual measurement values in a state where charging is started in a state where a metal foreign object such as a coin is placed on the upper surface of the installation plate 6 and the portable terminal 15 is placed thereon. .

  13 and 14 (without metallic foreign matter) and FIGS. 15 and 16 (with metallic foreign matter) revealed that a metallic foreign matter such as a coin was placed on the upper surface of the installation plate 6. In the state, the attenuation of the echo signal detected by the position detection coil 14 is accelerated.

  That is, FIG. 14 shows the peak value in the state without the metallic foreign object as time passes. For example, the time until the peak value is halved with respect to the peak value at the first time or a point near the first time is shown. Assuming A, in the case where there is a metallic foreign object shown in FIG.

  The reason why the echo signal is attenuated quickly is considered to be that the echo signal is shielded or energy-converted by the presence of the metal foreign matter.

  Further, as can be understood from FIG. 14 and FIG. 16, even if the type of the mobile terminal 15 is different, the tendency appears clearly.

  Furthermore, an important point is that the signal level applied to the position detection coil 14 is constant.

  For example, in the case where foreign matter detection is performed by the charging coil 8, when the foreign matter is present, the output of the charging coil 8 is increased due to a request from the mobile terminal 15 side. It is very difficult to detect the presence or absence of metallic foreign matter.

  In contrast, in the present embodiment, the signal level applied to the position detection coil 14 is constant, and the echo signal varies greatly depending on the presence / absence of metallic foreign matter, so the presence / absence of metallic foreign matter is easily detected. I can do it.

  In addition, since this is the same relationship even if the type of the portable terminal 15 is different, it is extremely effective.

  In the present embodiment, the peak value data of the echo signal stored in the memory 10a is utilized, and for example, the time until the peak value is halved with respect to the peak value at a point at or near the first time is a predetermined value. Shorter than that, it is determined that there is a foreign matter, and the foreign matter alarm unit 43 described above is driven.

  Now that the above operation has been understood, the actual control operation of the control unit 10 will be described.

  As described above, the present embodiment is characterized in that the operation of FIG. 17 is interposed between S10 and S11 of FIG. 10 as the operation of the control unit 10 in order to detect a metallic foreign object. Yes.

  First, the control unit 10 moves the charging coil 8 to the position of the mobile terminal 15 detected by the position detection coil 14 (S10 in FIG. 17), and then detects the echo signal so that the position detection coil 14 can detect the echo signal. A gain is set (S16 in FIG. 17).

  Next, the number of output pulses (for example, 50 in the embodiment) shown in FIG. 11A is confirmed (S17 in FIG. 17).

  Thereafter, the pulse shown in FIG. 11A is output to the position detection coil 14 (S18 in FIG. 17).

  Next, the timing (waiting for time) for detecting the echo signal is set (S19 in FIG. 17).

  In this (S19 in FIG. 17), the timing is shifted every time as understood in the above description.

  At this timing, the transistor 45 in FIG. 12 is turned off, and peak holding of the echo signal is started (S20 in FIG. 17).

  Thereafter, the signal is converted from an analog value to a digital value and stored in the memory 10a (S21 and S22 in FIG. 17).

  The process returns to (S17 in FIG. 17) again, and the peak hold of the echo signal is performed until the set number of detections is completed, and the results as shown in FIGS.

  When the set number of detections is completed, the time A in FIG. 14 or the time B in FIG. 16 is measured (S23 in FIG. 17).

  Thereafter, the charging coil 8 is energized (S11 in FIG. 17), and then the ID from the portable terminal 15 is acquired (S24 in FIG. 17).

  Next, it is confirmed whether or not the acquired ID is earlier than the time until decay (for example, time A in FIG. 14 or time B in FIG. 16) recorded in the memory 10a (S25 in FIG. 17). ).

  That is, in this embodiment, since the decay time of the previously charged model (ID) is recorded, if the decay time of this model is late for the portable terminal 15 to be charged this time, it is sequentially updated. At the same time, it is determined that there is no foreign object (S26 and S27 in FIG. 17).

  On the other hand, if the decay time of the first mobile terminal 15 to be charged this time or the previously charged model (ID) is slower than the decay time recorded in the memory 10a, the set decay time is exceeded. If it is later, it is determined that there is no metallic foreign matter (S27 in FIG. 17).

  If the decay time is earlier than the set decay time, the foreign object alarm unit 43 is driven (S28, S29, S30 in FIG. 17), assuming that a metallic foreign object exists.

  In the above embodiment, the charging coil 8 is provided so as to be movable in the horizontal direction in a state of being opposed to the lower surface side of the installation plate 6, but a plurality of charging coils (not shown) are provided on the installation plate 6, The charging coil at the position of the mobile terminal 15 detected by the detection coil 14 may be driven.

  Moreover, in the said embodiment, although the position detection coil 14 was provided in the installation board 6, you may arrange | position the position detection coil 14 below the installation board 6. FIG.

  Furthermore, in the above-described embodiment, the foreign object alarm unit 43 is driven when the presence of a foreign object is detected. However, a configuration in which energization of the charging coil 8 is stopped may be employed.

  As described above, in the present invention, after confirming the position of the mobile terminal by the position detection coil, a foreign object detection signal is applied to the position detection coil a plurality of times at predetermined intervals, and each foreign object detection signal is applied from the mobile terminal at the time of application. An echo signal is detected by a position detection coil and stored in a memory, and then a metallic foreign object on the installation plate is detected based on a change state of the echo signal stored in the memory.

  Even in the above configuration, the value of the echo signal obtained from the mobile terminal after application of each foreign object detection signal is different for each of a plurality of types of mobile terminals. However, since the change in the echo signal becomes large, foreign matter detection is performed based on the magnitude of this change. In this way, foreign matter detection can be performed even when multiple types of portable terminals are used. It can be done properly.

  Therefore, the use as a non-contact charging device for in-vehicle use or home use is expected.

DESCRIPTION OF SYMBOLS 1 Car 2 Car interior 3 Handle 4 Electronic device 5 Contactless charging device 6 Installation board 7 Main body case 8 Charging coil 9 Drive part 10 Control part 10a Memory 11 Surface board 12 Middle board 13 Back board 14 Position detection coil 15 Portable terminal 16 Holder DESCRIPTION OF SYMBOLS 17 Support leg 18 Support plate 19 Control board 20 Lower surface plate 21 Support body 22 X-axis direction drive shaft 23 Y-axis direction drive shaft 24 Through hole 25 Worm wheel 26 Gear 27 Worm 28 Motor 29 Gear plate 30 Worm wheel 31 Gear 32 Worm 33 Motor 34 Gear plate 35 Flexible wiring 36 X-axis motor control unit 37 Y-axis motor control unit 38 Charging coil control unit 39 Coil control unit for detection 40 Power switch 41 Switch 42 Switch 43 Foreign matter alarm unit 44 Capacitor 45 Transistor

Claims (7)

A main body case having an installation plate on the upper surface, the installation plate, or a position detection coil that is disposed below the installation plate and detects the position of a mobile terminal installed on the upper surface of the installation plate, and the installation plate, or this A charging coil that is disposed below the installation plate and that charges the portable terminal installed on the upper surface of the installation plate, a control unit that is connected to the charging coil and the position detection coil, and a control unit that is connected to the control unit And the controller, after confirming the position of the mobile terminal by the position detection coil, applies a foreign object detection signal to the position detection coil a plurality of times at predetermined intervals, and at the time of applying each foreign object detection signal, The echo signal from the portable terminal is detected by the position detection coil, stored in the memory, and then based on the change state of the echo signal stored in the memory, Noncontact charging device that performs foreign object detection on the plate. The controller detects the value of the echo signal from the portable terminal after each foreign object detection signal is applied and stores the value in the memory, and then, among the echo signals stored in the memory, the Mth echo signal From the value, the Nth time behind the Mth time, which has become an echo signal attenuated below the attenuation setting value, is detected, and then the attenuation elapsed time from the Mth time to the Nth time is detected. The contactless charging apparatus according to claim 1, wherein the time when the decay elapsed time is shorter than a threshold is detected as the presence of foreign matter on the installation plate. After the first foreign object detection signal is applied, the control unit starts detecting an echo signal from the mobile terminal after a first predetermined time from the application time point, and then determines the peak value of the echo signal within the predetermined time thereafter. Then, after the second foreign object detection signal is applied, the detection of the echo signal from the portable terminal is started after the second predetermined time, after the first foreign object detection signal is applied. The contactless charging apparatus according to claim 2, wherein a peak value of the echo signal within a predetermined time is stored in the memory, and the second predetermined time is longer than the first predetermined time. The said control part detects the echo signal from a portable terminal after each foreign material detection signal application, and then memorize | stores in the said memory after converting the value of this detected echo signal into a digital signal. The contactless charging apparatus as described in any one. The contactless charging apparatus according to claim 1, wherein when the presence of a foreign object is detected, the control unit stops energization of the charging coil. The contactless charging apparatus according to any one of claims 1 to 5, wherein when the presence of a foreign object is detected, the control unit drives an alarm unit. The motor vehicle which has arrange | positioned the non-contact charging device as described in any one of Claim 1 to 6 in the vehicle.

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