JP2014090606A - Assembled charging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact non-contact type assembled charging device.SOLUTION: An assembly charging device 10 comprises: a base 11; a coil support unit 12 which is erected from the base 11 and has a regular hexagonal prism shape; a terminal receiving table support unit 13 which is provided on the periphery of the coil support unit 12 and has a hexagonal cylindrical shape; and a power source unit 14. Primary-side coils 15 for power supply are embedded in the side surfaces 12a to 12f of the coil support unit 12 so as to be arranged in a cylindrical shape in the peripheral direction and longitudinal direction. Plural receiving tables 16 for receiving portable terminals 17 are arranged on the side surfaces 13a to 13f at the outside of the terminal receiving table support unit 13. The portable terminals 17 are charged while not arranged in the horizontal direction, but arranged in the peripheral direction and longitudinal direction. Therefore, the assembly charging device 10 can simultaneously charge many portable terminals 17 although it is compact.

Description

  The present invention relates to a collective charging device, and more particularly to a collective charging device that charges a plurality of portable terminals in a contactless manner.

  At present, in mobile terminals such as mobile phones and mobile information collection terminals, the connector provided at the tip of the power supply cord of the charging device is connected to the mobile terminal, or the mobile terminal is placed in the cradle and brought into contact with the power supply terminal. , Charging. Further, as a charging device for a portable terminal, a charging device for non-contact charging is also generally known (for example, see Patent Document 1).

  In the non-contact charging device, the charging device and the portable terminal are each provided with a coil, and electric power is transmitted between the coils by an electromagnetic induction method to the portable terminal. In this electromagnetic induction method, when current is passed through one of two adjacent coils, magnetic flux generated in one of the coils serves as a medium, and electromagnetic induction in which an electromotive force is generated in the other adjacent coil is used.

  Some non-contact type charging devices use a magnetic resonance method. In this magnetic field resonance method, electric power is transmitted by magnetic field resonance between power transmission and power reception devices generated by using a coil / capacitor attached to a power transmission / power reception device as a resonance circuit.

  In any case, since the contactless charging device requires a configuration for transmitting power in a contactless manner, compared to a configuration in which power is directly connected by a connector or the like to supply power, In many cases, the occupied volume for installation also increases. For this reason, there are many types of non-contact charging devices that charge one mobile terminal with respect to one charging device.

  On the other hand, there is a collective charging device that can charge a plurality of portable terminals with a single charging device (not a non-contact type, for example, see Patent Document 2). This collective charging device is provided with a plurality of recesses in the upper part, and when a portable terminal is inserted into these recesses, the socket provided at the bottom of the recess and the charging connection port of the portable terminal are coupled together and electrically The connection is made and charging is started.

JP 2000-197275 A JP 2008-043038 A (FIG. 4)

  However, if the collective charging device is to be a non-contact type, a coil and a circuit for driving the coil are required for each concave portion into which the portable terminal is inserted. In particular, it should be installed close to the portable terminal. Since the coil is large, its installation location is required for each recess. For this reason, in the collective charging device in which the concave portions for inserting the mobile terminal are provided in the horizontal direction, when this is a non-contact type, the installation location of the coil must be taken in the horizontal direction, There was a problem that the entire apparatus would be enlarged.

  This invention is made | formed in view of such a point, and it aims at providing a compact non-contact-type collective charging device.

  In the present invention, in order to solve the above problems, in a collective charging device for charging a plurality of portable terminals in a non-contact manner, a plurality of coils for power transmission and the coils are arranged in a columnar shape in a circumferential direction and a vertical direction. A terminal support provided with a coil support portion that supports the mobile terminal in a state where it is arranged, and a pedestal for placing the portable terminal to be charged on the outer peripheral surface of the coil support portion at a position corresponding to the coil. A collective charging device is provided, comprising: a base support portion; and a drive control circuit that drives each of the coils.

  According to such a collective charging apparatus, the plurality of coils are arranged in the circumferential direction and the vertical direction so as to have a columnar shape. Thereby, the collective charging apparatus can be configured compactly.

  The collective charging device with the above configuration is configured to charge by placing the mobile terminal around the columnar shape, so that the installation area is small and compact compared to the case where the mobile terminal is charged side by side in the horizontal direction. There is an advantage that you can. In addition, when increasing the number of units that can be charged, it can be easily expanded by extending in the vertical direction, so it is not necessary to secure an installation space for the expansion.

It is explanatory drawing which shows the structural example of the collective charging device which concerns on 1st Embodiment. It is a circuit block diagram which shows an example of the charging circuit of an aggregate charging device and a portable terminal. It is a flowchart which shows the control flow in the drive control part of an aggregate charging device. It is a figure which shows the structural example of the collective charging device which concerns on 2nd Embodiment. It is a circuit block diagram which shows an example of the charging circuit of an aggregate charging device and a portable terminal. It is a figure which shows the structural example of the collective charging device which concerns on 3rd Embodiment, (A) is a perspective view of a collective charging device, (B) is a top view of a collective charging device. It is a circuit block diagram which shows an example of the charging circuit of an aggregate charging device and a portable terminal. It is a flowchart which shows the control flow in the drive control part of an aggregate charging device. It is a flowchart which shows the control flow in the motor control part of an aggregate charging device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each embodiment, a plurality of other embodiments can be combined and implemented within a consistent range.

FIG. 1 is an explanatory diagram illustrating a configuration example of the collective charging apparatus according to the first embodiment.
The collective charging apparatus 10 according to the first embodiment includes a base 11, a coil support portion 12 erected on the base 11, and a terminal cradle support portion 13 provided around the coil support portion 12. I have.

  The base 11 is connected to a power supply unit 14 of an AC adapter that supplies power to the collective charging device 10. The power supply unit 14 is installed outside the base 11 in this embodiment, but may be housed inside.

  The coil support portion 12 has a polygonal column shape (regular hexagonal column in the illustrated example), and a plurality of primary coils 15 for power feeding are embedded in each of the side surfaces 12a to 12f. Yes. In this embodiment, two primary side coils 15 are arranged vertically on one side surface 12a, and two primary side coils 15 are similarly arranged on all other side surfaces 12b to 12f. In other words, the primary side coil 15 is arranged in a cylindrical shape by being arranged in the circumferential direction and the longitudinal direction, and is supported by the coil support portion 12. A circuit for driving the primary side coil 15 is provided in the base 11 or the coil support portion 12. In the present embodiment, two primary coils 15 are arranged vertically, but the number is not limited to two.

  The terminal cradle support portion 13 has a hexagonal cylinder shape in accordance with the outer shape of the coil support portion 12, and a plurality of cradles 16 for receiving the mobile terminal 17 are installed on each of the outer side surfaces 13 a to 13 f. ing. The cradle 16 is configured so that the power receiving secondary side coil of the mobile terminal 17 is in a position corresponding to the primary side coil 15 when the terminal cradle support portion 13 is externally fitted to the coil support portion 12. It is provided in a position to receive.

  As shown in the left side of FIG. 1, the collective charging device 10 is assembled by externally fitting a terminal cradle support part 13 to the coil support part 12, and as a result, as shown in the right side of FIG. Configured. As a result, the mobile charging device 17 is arranged not in the horizontal direction but in the circumferential direction and in the vertical direction so that charging can be performed. You will be able to charge.

FIG. 2 is a circuit block diagram illustrating an example of a charging circuit for the collective charging device and the portable terminal, and FIG. 3 is a flowchart illustrating a control flow in a drive control unit of the collective charging device.
The collective charging device 10 includes a power supply circuit 20 accommodated in the power supply unit 14. The power supply circuit 20 can be, for example, a switching power supply circuit that outputs a DC voltage having a predetermined voltage from a commercial power supply.

  The collective charging device 10 also has a drive circuit 21 that drives the primary coil 15. The drive circuit 21 has an input connected to the power supply circuit 20 and an output connected to the primary coil 15. The collective charging apparatus 10 further includes a drive control unit 22 that controls the drive circuit 21 and a current detection unit 23 that detects a current that drives the primary side coil 15. The output of the current detection unit 23 is a drive control unit. Connected to the unit 22.

  The drive circuit 21, the drive control unit 22, and the current detection unit 23 (hereinafter, collectively referred to as a drive control circuit) are provided as many as the number of the primary side coils 15. For example, the collective charging apparatus 10 according to the first embodiment includes 12 sets of the drive control circuit including the drive circuit 21, the drive control unit 22, and the current detection unit 23 and the primary side coil 15.

  On the other hand, the mobile terminal 17 includes a secondary coil 31 for receiving power, and the output of the secondary coil 31 is connected to the charging circuit 32. The charging circuit 32 is connected to the charging control unit 33 and the battery 34. The mobile terminal 17 has a configuration in which the secondary coil 31 receives the power transmitted from the primary coil 15 of the collective charging device 10 and the charging circuit 32 charges the battery 34 with the power. In particular, it is not limited to the illustrated configuration.

  In the collective charging device 10, the drive circuit 21 receives power from the power supply circuit 20 and supplies it to the primary side coil 15, and the drive control is performed by the drive control unit 22. That is, as shown in FIG. 3, the drive control unit 22 first determines whether or not the mobile terminal 17 is installed on the cradle 16 of the terminal cradle support unit 13 (step S1). Whether or not the portable terminal 17 is installed on the cradle 16 is determined, for example, by detecting that the magnetic environment of the primary coil 15 has changed due to the proximity of the secondary coil 31 to the primary coil 15. be able to. Of course, an optical sensor or the like may be provided on the cradle 16 to detect the installation of the portable terminal 17 on the cradle 16.

  Next, when installation of the mobile terminal 17 is detected, the drive control unit 22 detects the state of charge of the mobile terminal 17 (step S2). This charging state is detected by, for example, temporarily driving the primary side coil 15 and detecting the charging current at that time by the current detection unit 23, so that the rough charging state of the battery 34 of the portable terminal 17 is detected. Can know. Of course, the state of charge can be detected by using the communication function of the mobile terminal 17 to notify the mobile terminal 17 of the accurate state of charge of the battery 34.

  Next, the drive control part 22 judges whether the detected charge state is a full charge (step S3). If it is determined that the battery is fully charged, the drive control process is terminated. When it is determined that the battery is not fully charged, the drive control unit 22 controls the drive circuit 21 to start a charging operation (step S4).

  Next, the drive control unit 22 monitors the charging current by the current detection unit 23, and determines whether or not the battery 34 of the mobile terminal 17 is fully charged (step S5). For example, the drive control unit 22 determines that the battery is fully charged when the charging current rapidly decreases and falls below a predetermined value. This is because, on the mobile terminal 17 side, when the charging current of the battery 34 is equal to or less than a predetermined value and reaches a fully charged voltage, the charging control unit 33 determines that it is fully charged and stops charging. Since the charging current of the primary coil 15 is also reduced, this current drop is detected. Of course, in this case as well, it is possible to notify the full charge detection of the battery 34 from the portable terminal 17 using the communication function of the portable terminal 17. When full charge is detected, the drive control unit 22 stops the charging operation (step S6), and completes the charging operation of the battery 34 of the mobile terminal 17.

  FIG. 4 is a diagram illustrating a configuration example of the collective charging device according to the second embodiment, and FIG. 5 is a circuit block diagram illustrating an example of the collective charging device and a charging circuit of the portable terminal. 4 and 5, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals.

  The collective charging device 40 according to the second embodiment is obtained by expanding the collective charging device 10 according to the first embodiment and doubling the number of portable terminals 17 that can be charged. That is, the collective charging device 40 includes the coil support portion 41 and the coil support portion 41 having the same function as the coil support portion 12 and the terminal cradle support portion 13 of the collective charging device 10 on the collective charging device 10 according to the first embodiment. The terminal cradle support 42 is stacked.

  In this embodiment, it is preferable that the primary side coil 15 and various circuits are housed in the coil support portion 12 and the coil support portion 41 to drive the primary side coil 15 and the primary side coil 15, respectively. Thereby, the collective charging apparatus 40 can be easily expanded only by stacking the units including the coil support portion 41 and the terminal cradle support portion 42.

  For this purpose, the coil support portion 12 is provided with a power supply connector 43 (see FIG. 5) on its upper surface, and the coil support portion 41 is provided with a power receiving connector 44 (see FIG. 5) on its lower surface. A power supply connector 45 is also provided on the upper surface.

  In addition, when the unit including the coil support part 41 and the terminal cradle support part 42 is added, the power supply part 14a which increased the current capacity is used. Of course, instead of the power supply unit 14a, two power supply units 14 may be connected in parallel.

  As shown in FIG. 5, the coil support unit 41 includes the drive circuit 51, the drive circuit 51, the drive control unit 22, the current detection unit 23, and the primary side coil 15 housed in the coil support unit 12. The control part 52, the electric current detection part 53, and the primary side coil 54 are accommodated. The coil support part 41 is also provided with a power line 55, one end of which is connected to a connector 44 coupled to the connector 43 provided on the coil support part 12, and the other end is connected to a connector 45. ing. The connector 45 serves as a power supply terminal for supplying power to the upper stage when another stage is added.

  Although not shown, the coil support portion 12 is formed such that its upper end surface is lower than the upper end surface of the terminal cradle support portion 13. Although not shown, the coil support portion 41 has a lower end surface formed lower than the lower end surface of the terminal cradle support portion 42 and the upper end surface of the terminal cradle support portion 42 as shown in FIG. It is formed lower than the upper end surface. Thereby, the unit including the coil support part 41 and the terminal cradle support part 42 can be easily placed and fitted on the coil support part 12 and the terminal cradle support part 13.

  6A and 6B are diagrams illustrating a configuration example of the collective charging apparatus according to the third embodiment, in which FIG. 6A is a perspective view of the collective charging apparatus, FIG. 6B is a plan view of the collective charging apparatus, and FIG. It is a circuit block diagram which shows an example of the charging circuit of a charging device and a portable terminal. In FIGS. 6 and 7, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals.

  The collective charging device 60 according to the third embodiment includes a base 11, a coil support portion 61 erected so as to be rotatable on the base 11, and a base 11 so as to rotatably support the coil support portion 61. And a terminal cradle support portion 62 fixed to the head. The base 11 is connected to a power supply unit 14 that supplies power to the collective charging device 60.

  The coil support portion 61 has a cylindrical shape, and a plurality of primary coils 15 for power feeding are embedded and installed on the side surface thereof. In this embodiment, the coil support portion 61 is provided with three primary coils 15 in the vicinity of the surface of the cylindrical side surface at intervals of 120 degrees in the circumferential direction, and further, the three primary coils Three primary coils 15 are further installed above 15. In this embodiment, the three primary coils 15 in the lower stage and the three primary coils 15 in the upper stage are arranged in the vertical direction, but they are shifted by 60 degrees from each other in the lower stage and the upper stage. You may arrange in a state. Thereby, the coil support part 61 has the number of the primary side coils 15 halved compared with the collective charging apparatus 10 which concerns on 1st Embodiment.

  The coil support 61 is also rotatably attached to the base 11 by a motor 63 (see FIG. 7) housed in the base 11. In this embodiment, the motor 63 rotates the coil support portion 61 by 60 degrees.

  The terminal cradle support portion 62 is formed in a cylindrical shape having an inner diameter matching the outer diameter of the coil support portion 61 on the inner side, and has a hexagonal column shape on the outer side. The side surface of the terminal cradle support 62 is provided with a plurality of cradles 16 at predetermined positions, similarly to the terminal cradle support 13 of the collective charging device 10 according to the first embodiment.

  With the above configuration, the collective charging device 60 is configured such that when every other cradle 16 installed in the circumferential direction is placed in a chargeable state and the coil support portion 61 rotates 60 degrees, the remaining half of the receiving devices 16 are then received. The stand 16 is placed in a chargeable state. This makes it possible to effectively use the chargeable time.

  That is, it is considered that it takes about 5 hours to fully charge the battery 34 used for the portable terminal 17 by the non-contact charging device. On the other hand, when it is considered that the time from midnight after work to the morning can be used for charging, about 10 hours can be spent for charging. In this case, approximately 5 hours after the charging is completed is an extra time when the charging function is not used.

  According to the collective charging device 60 according to the third embodiment, when the charging time is 5 hours at the longest, the mobile terminals 17 placed on the cradle 16 installed every other in the circumferential direction are the first. The remaining mobile terminal 17 is charged within the remaining 5 hours. Thereby, the chargeable time can be used effectively. Further, in the collective charging device 60, the combination of the primary side coil 15 and the drive control circuit (the drive circuit 21, the drive control unit 22, and the current detection unit 23) related to the primary side coil 15 is the first embodiment. Half of the collective charging device 10 is used. Even if a newly required motor 63 (see FIG. 7) is added, the cost can be reduced as compared with the collective charging device 10 according to the first embodiment.

  As shown in FIG. 7, the power supply circuit 20 is housed in the power supply unit 14, and the coil support unit 61 includes the primary coil 15, the drive circuit 21, the drive control unit 22, and the current detection. Six sets of portions 23 are accommodated. In the collective charging device 60, a motor 63, a motor drive circuit 64, and a motor control unit 65 are housed in the base 11. The motor drive circuit 64 is supplied with power from the power supply circuit 20 and rotationally drives the motor 63. The motor control unit 65 is connected to all the drive control units 22 and controls the rotation of the motor 63 based on the notification from the drive control unit 22.

  Although not shown in FIG. 6, the collective charging device 60 includes a power supply connector 66 and a communication connector 67 on the upper surface of the coil support portion 61 in preparation for expansion as shown in FIG. 4. Yes.

Next, the control flow of the drive control unit 22 will be described with reference to FIG. 8, and the control flow of the motor control unit 65 will be described with reference to FIG.
FIG. 8 is a flowchart showing a control flow in the drive control unit of the collective charging apparatus, and FIG. 9 is a flowchart showing a control flow in the motor control unit of the collective charging apparatus.

  First, it is assumed that the collective charging device 60 has its coil support portion 61 stopped at the first rotational position. Here, the drive control part 22 judges whether the portable terminal 17 was installed in the cradle 16 of the terminal cradle support part 13, as shown in FIG. 8 (step S11). Whether or not the portable terminal 17 is installed on the cradle 16 is determined, for example, by detecting that the magnetic environment of the primary coil 15 has changed due to the proximity of the secondary coil 31 to the primary coil 15. be able to. When installation of the mobile terminal 17 is detected, the drive control unit 22 notifies the motor control unit 65 of terminal detection (step S12).

  Next, the drive control part 22 detects the charge state of the portable terminal 17 (step S13). This charging state is detected by, for example, temporarily driving the primary side coil 15 and detecting the charging current at that time by the current detection unit 23, so that the rough charging state of the battery 34 of the portable terminal 17 is detected. Can know.

  Next, the drive control unit 22 determines whether or not the detected state of charge is fully charged (step S14). If it is determined that the battery is fully charged, the drive control process is terminated. If it is determined that the battery is not fully charged, the drive controller 22 controls the drive circuit 21 to start the charging operation (step S15).

  Next, the drive control unit 22 monitors the charging current by the current detection unit 23, and determines whether or not the battery 34 of the mobile terminal 17 is fully charged (step S16). For example, the drive control unit 22 can determine that the battery is fully charged when the charging current rapidly decreases and falls below a predetermined value.

  Next, when full charge is detected, the drive control unit 22 stops the charging operation (step S17), notifies the motor control unit 65 of the completion of charging (step S18), and thereby the mobile terminal 17 Charging of the battery 34 is completed.

  On the other hand, as shown in FIG. 9, the motor control unit 65 first clears the setting for storing whether or not the mobile terminal 17 to be charged has been charged (step S21). Next, the motor control unit 65 determines whether there is a notification of terminal detection from the drive control unit 22 (step S22). When there is a notification of terminal detection, the motor control unit 65 identifies the mobile terminal 17 detected from the identification number assigned to the notified drive control unit 22 and sets the detection terminal (step S23). ). If there is no notification of terminal detection, the motor control unit 65 passes the process of step S23.

  Next, the motor control unit 65 determines whether there is a notification of completion of charging from the drive control unit 22 (step S24). When there is a notification of completion of charging, the motor control unit 65 identifies the mobile terminal 17 that has completed charging from the identification number of the drive control unit 22 that has received the notification, and sets the completion of charging (step S25). If there is no notification of completion of charging, the motor control unit 65 passes the process of step S25.

  Next, the motor control unit 65 refers to the setting state and determines whether there is a terminal that has not been fully charged among the detected mobile terminals 17 (step S26). When there is a terminal that has not been fully charged, the motor control unit 65 proceeds to the process of step S22. When charging of all the terminals has been completed, the motor 63 is driven to move the coil support unit 61 to 60. The rotation is stopped at the second rotation position rotated by the degree (step S27). Then, the motor control unit 65 returns to the process of step S21, and the collective charging device 60 starts charging at the second rotational position.

  According to the processing flow of the motor control unit 65, since charging is completed at the second rotational position after all the mobile terminals 17 to be charged at the first rotational position have been charged, Regardless of the state of charge, all the mobile terminals 17 can be fully charged.

  After the determination in step S26, the motor control unit 65 may determine the number of times of motor drive, and if the number of times of motor drive is 2, the control of this motor may be terminated. At this time, the motor control unit 65 may turn off the power supply unit 14.

  Further, the process of the motor control unit 65 in FIG. 9 is performed even when the same unit as the unit including the coil support unit 61 and the terminal support unit 62 is overlapped and vertically expanded as shown in FIG. Can be processed in the same way without changing.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this specific embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, although the outer shape of the terminal cradle support portions 13 and 62 is a hexagonal prism, it may be a polygonal prism that is a triangular prism or more. In addition, in the case where the coil support portion 61 rotates as in the third embodiment, it is preferable to use a columnar body having an even number of corners such as a quadrangular column and an octagonal column. Further, in the third embodiment, the coil support portion 61 has three primary coils 15 disposed in the vicinity of the surface of the cylindrical side surface at intervals of 120 degrees in the circumferential direction. For example, a plurality of primary coils 15 may be installed continuously by 60 degrees in the circumferential direction.

DESCRIPTION OF SYMBOLS 10 Collective charging apparatus 11 Base 12 Coil support part 12a-12f Side surface 13 Terminal cradle support part 13a-13f Side surface 14, 14a Power supply part 15 Primary side coil 16 Receptacle 17 Portable terminal 20 Power supply circuit 21 Drive circuit 22 Drive control part 23 Current detection unit 31 Secondary coil 32 Charging circuit 33 Charging control unit 34 Battery 40 Collective charging device 41 Coil support unit 42 Terminal cradle support unit 43, 44, 45 Connector 51 Drive circuit 52 Drive control unit 53 Current detection unit 54 Primary Side coil 55 Power supply line 60 Collective charging device 61 Coil support part 62 Terminal cradle support part 63 Motor 64 Motor drive circuit 65 Motor control part 66 Connector (for power supply)
67 Connector (for communication)

Claims (9)

In the collective charging device for charging a plurality of portable terminals in a contactless manner,
A plurality of coils for power transmission;
A coil support that supports the coil in a state of being arranged in a columnar shape in a circumferential direction and a vertical direction;
A terminal cradle support portion provided with a cradle for placing the mobile terminal to be charged on the outer peripheral surface of the position corresponding to the coil provided around the coil support portion;
Drive control circuits for respectively driving the coils;
A collective charging device comprising: The terminal cradle support portion has a polygonal cylindrical shape, and a cradle is provided on each side surface constituting the polygon,
The said coil support part has the shape of the cylinder rotatably supported by the said terminal cradle support part, The said coil is provided in the position corresponding to every other cradle arrange | positioned in the circumferential direction. To support,
A motor for rotating the coil support portion from a first rotation position capable of being charged by the coil corresponding to the cradle to a second rotation position corresponding to the cradle adjacent in the rotation direction; The collective charging apparatus according to claim 1, further comprising:   3. The collective charging device according to claim 2, wherein the motor rotates the coil support portion to the second rotational position after completion of charging of all the mobile terminals that can be charged at the first rotational position. .   In order to allow the coil support and the terminal cradle support to be expanded by placing another coil support and another terminal cradle support in which the coil and the drive control circuit are accommodated, the coil support. 4. The collective charging according to claim 2, further comprising: a power feeding connector on an upper end surface of the power supply device; and a communication connector for notifying detection of installation of the mobile terminal and completion of charging from the drive control circuit. apparatus.   The collective charging device according to any one of claims 2 to 4, wherein the terminal cradle support portion has a hexagonal cylindrical shape.   The collective charging device according to claim 1, wherein the coil support portion has a polygonal column shape, and the coil is embedded in each side surface constituting the polygonal column.   2. The collective charging apparatus according to claim 1, wherein the terminal cradle support portion has a polygonal cylindrical shape that matches the shape of the coil support portion.   In order to allow the coil support and the terminal cradle support to be expanded by placing another coil support and another terminal cradle support in which the coil and the drive control circuit are accommodated, the coil support. The collective charging device according to claim 6, further comprising a power feeding connector on an upper end surface of the battery pack.   The collective charging apparatus according to claim 6, wherein the coil support portion has a hexagonal column shape, and the terminal cradle support portion has a hexagonal tube shape.

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