JP2012213278A - Transmission equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide transmission equipment capable of achieving size reduction and implementing power transmission to a plurality of electronic apparatuses.SOLUTION: The transmission equipment includes a transmission coil for supplying electric power in no contact with a power reception coil by electromagnetic induction in an enclosure storing two power transmission coils 13 and 23, which are structured to move in two states: a state where the central axes of the power transmission coils 13 and 23 are substantially met each other and a state where the power transmission coils 13 and 23 are not overlapped with each other.

Description

  The present invention relates to a power transmission device that performs power transmission in a contactless manner with respect to a power receiving device.

  In recent years, a method for transmitting power in a contactless manner to an electronic device such as a mobile phone, a digital camera, or a laptop computer has become widespread. Electric power is transmitted to the power receiving coil built in the electronic device by an alternating magnetic field generated from the power transmitting coil built in the power transmitting device. In order to transmit electric power to two electronic devices at the same time, two power transmission coils are required.

  Patent Document 1 describes a power transmission device that can charge a plurality of mobile phones simultaneously. A method is described in which a charging sheet including a plurality of power transmission coils is provided, and power is transmitted from each power transmission coil to each mobile phone.

Japanese Patent Laid-Open No. 2005-6440

  However, since each power transmission coil needs to be arranged on the same plane, the power transmission device cannot be reduced in size. Therefore, it is inconvenient when the power transmission device is moved or carried. In addition, when power is transmitted only to one electronic device, a space of a power transmission coil that is not used becomes a dead space.

  The present invention has been made in consideration of such problems, and an object of the present invention is to provide a power transmission device capable of reducing the size of the power transmission device and transmitting power to a plurality of electronic devices.

  In order to achieve such an object, the present invention provides a power transmission device having a power transmission coil that supplies power to a power receiving coil in a non-contact manner by electromagnetic induction, and the case houses two power transmission coils. The power transmission coil is configured to move in a state where the central axes of the power transmission coils substantially coincide with each other and in a state where the power transmission coils do not overlap.

  According to the present invention, the power transmission device can be reduced in size.

It is the permeation | transmission perspective view and sectional drawing of the power transmission apparatus which concern on 1st Example of this invention, The figure which shows the state which the housing | casing opened It is the permeation | transmission perspective view and sectional drawing of the power transmission apparatus which concern on 1st Example of this invention, The figure which shows the state which the housing | casing closed. The block diagram of the power transmission apparatus which concerns on 1st Example of this invention. It is a schematic perspective view and sectional drawing when a power receiving apparatus is placed on the power transmitting apparatus according to the first embodiment of the present invention, and shows a state in which a housing is opened. It is a schematic perspective view and sectional drawing when a power receiving apparatus is mounted on the power transmitting apparatus according to the first embodiment of the present invention, and shows a state in which the housing is closed. The schematic perspective view and sectional drawing of the power transmission apparatus which concern on 2nd Example of this invention

  Embodiments will be described below with reference to the drawings.

  FIG. 1 is a power transmission apparatus according to a first embodiment of the present invention, and shows a state where a housing is opened. FIG. 1A is a transparent perspective view of the power transmission device, and FIG. 1B is a cross-sectional view of the power transmission device at a position along the line AA in FIG.

  The power transmission device 10 includes a first housing 11, a first power transmission coil 13, a first substrate 15, a permanent magnet 17, a second housing 21, a second power transmission coil 23, a second substrate 25, a Hall element 27, and a flexible. A substrate 31 is provided. The first casing 11 accommodates a first power transmission coil 13, a first substrate 15, and a permanent magnet 17. The second casing 21 accommodates a second power transmission coil 23, a second substrate 25, and a hall element 27. The first substrate 15 and the second substrate 25 are electrically connected by a flexible substrate 31.

  The first substrate 15 is fixed to the first housing 11 and supports the first power transmission coil 13. Similarly, the second substrate 25 is fixed to the second housing 21 and supports the second power transmission coil 23. The permanent magnet 17 and the hall element 27 are mounted on the first substrate 15 and the second substrate 25, respectively. The winding direction of the 1st power transmission coil 13 and the 2nd power transmission coil 23 is the same, and it has a flat and thin structure, respectively. The surface of each housing | casing 11 and 21 is comprised so that it may become planar and parallel mutually, and a receiving device is mounted here. In a state where the housing 21 is opened from the housing 11, a stepped portion 37 is formed between the surface of the first housing 11 and the surface of the second housing 21. A convex stepped portion 39 is provided on the surface of the second housing 21.

  In a state where the housing 21 is opened from the housing 11, the distance between the central axes of the power transmission coils is set to be larger than the diameter of the power transmission coils, and the power transmission coils are arranged so as not to overlap each other. The permanent magnet 17 and the hall element 27 are provided for detecting the open / closed state of the casings 11 and 21. In a state where the housing 21 is opened from the housing 11, the permanent magnet 17 and the hall element 27 are located at positions away from each other, so that the hall element 27 does not detect the magnetic flux of the permanent magnet 17.

  FIG. 2 is a power transmission apparatus according to the first embodiment of the present invention, and shows a state in which the housing is closed. 2A is a transparent perspective view of the power transmission device, and FIG. 2B is a cross-sectional view of the power transmission device at a position along the line BB in FIG. 2A.

  In a state where the casing 21 is closed from the casing 11, the central axes of the power transmission coils coincide with each other. Further, since the Hall element 27 slides to a position facing the permanent magnet 17, the Hall element 27 detects the magnetic flux of the permanent magnet 17. As described above, the second casing 21 is connected to the first casing 11 and is configured to be slidable in and out of the first casing 11. Thereby, the 2nd power transmission coil 23 can be accommodated in the 1st housing | casing 11 in which the 1st power transmission coil is accommodated.

  FIG. 3 shows a block diagram of the power transmission apparatus according to the first embodiment of the present invention. The power transmission device 10 includes a first power transmission coil 13, a first drive circuit 19, a second power transmission coil 23, a second drive circuit 29, a detection unit 33, and a control circuit 35. The detection means 33 includes the permanent magnet 17 and the hall element 27.

  The first drive circuit 19 and the second drive circuit 29 are supplied with an input voltage Vin from a DC power supply. The detection means 33 detects the open / closed state of the casings 11 and 21 by the permanent magnet 17 and the hall element 27 and supplies the detection result to the control circuit 35. The operation of each of the drive circuits 19 and 29 is controlled by a control circuit 35 constituted by a microcomputer as an example. The first power transmission coil 13 is connected to the output terminal of the first drive circuit 19, and the second power transmission coil 23 is connected to the output terminal of the second drive circuit 29. The outputs of the drive circuits 19 and 29 are controlled by the control circuit 35 and supply AC power to the respective power transmission coils. As an example, each drive circuit 19 and 29 is configured by a full bridge circuit, a half bridge circuit, or the like.

  Next, a method for driving the power transmission coils 13 and 23 will be described. The drive circuits 19 and 29 perform different operations depending on the open / closed state of the housings 11 and 21.

  First, the case where the housing | casing 21 is opened from the housing | casing 11 is demonstrated. FIG. 4 is a diagram when the power receiving device is placed on the power transmitting device according to the first embodiment of the present invention, and is a diagram illustrating a state in which the housing is opened. 4A is a schematic perspective view of the power transmission device and the power reception device, and FIG. 4B is a cross-sectional view of the power transmission device and the power reception device along the line CC in FIG. 4A. It is.

  The power receiving devices 50 and 60 include power receiving coils 51 and 61, respectively. When the housing 21 is opened from the housing 11, the power receiving device 50 can be placed on the surface of the first housing 11 and the power receiving device 60 can be placed on the surface of the second housing 21. In the state where the housing 21 is opened from the housing 11, the Hall element 27 does not detect the magnetic flux of the permanent magnet 17, so that the control circuit 35 controls the drive circuits 19 and 29 individually.

  When the power receiving device 50 is placed on the first housing 11 and the power receiving coil 51 is disposed at a position facing the first power transmitting coil 13, the first drive circuit 19 supplies the AC power to the first power transmitting coil 13. Supply. Then, power is transmitted from the first power transmission coil 13 to the power reception coil 51. When the power receiving device 50 is not placed on the first housing 11, the control circuit 35 controls the first drive circuit 19 so as to stop power transmission to the first power transmission coil 13.

  When the power receiving device 60 is placed on the second casing 21 and the power receiving coil 61 is disposed at a position facing the second power transmitting coil 23, the second drive circuit 29 supplies AC power to the second power transmitting coil 23. Supply. Then, power is transmitted from the second power transmission coil 23 to the power reception coil 61. When the power receiving device 60 is not placed on the second casing 21, the control circuit 35 controls the second drive circuit 29 so as to stop power transmission to the second power transmission coil 23.

  As described above, when the housing 21 is opened from the housing 11, power can be transmitted to the power receiving devices 50 and 60 simultaneously. In addition, the power transmission coils 13 and 23 can be individually controlled according to the states of the loads 47 and 57 of the power receiving devices 50 and 60.

  Any method may be used to detect whether or not a power receiving device is mounted on each of the casings 11 and 21. For example, the control circuit 35 generates a pulse signal for confirming the presence or absence of the power receiving device in a predetermined period. The drive circuit is driven by this pulse signal, and the power transmission coil is driven at a frequency corresponding to the pulse signal. Based on the current flowing through the power transmission coil at this time, it is detected whether or not the power receiving device is placed at a position facing the power transmission coil. And when it detects that the power receiving apparatus is mounted in the position facing a power transmission coil, what is necessary is just to supply alternating current power to the power transmission coil.

  Next, a case where the casing 21 is closed from the casing 11 will be described. FIG. 5 is a diagram when the power receiving device is mounted on the power transmitting device according to the first embodiment of the present invention, and is a diagram illustrating a state in which the housing is closed. 5A is a schematic perspective view of the power transmission device and the power reception device, and FIG. 5B is a cross-sectional view of the power transmission device and the power reception device along the line DD in FIG. 5A. It is.

  When the housing 21 is closed from the housing 11, the second housing 21 is housed inside the first housing 11. At this time, the central axes of the first power transmission coil 13 and the second power transmission coil 23 substantially coincide with each other. The power receiving device 50 is placed on the surface of the first housing 11. In a state where the casing 21 is closed from the casing 11, the Hall element 27 detects the magnetic flux of the permanent magnet 17, and the control circuit 35 controls the drive circuits 19 and 29 in synchronization.

  When the power receiving device 50 is mounted on the first housing 11 and the power receiving coil 51 is disposed at a position facing the first power transmitting coil 13, the drive circuits 19 and 29 are connected to the power transmitting coils 13 and 23, respectively. Supply power. Then, power is transmitted to the power receiving coil 51 by the alternating magnetic field generated from each of the power transmitting coils 13 and 23. When the power receiving device 50 is not placed on the first housing 11, the control circuit 35 controls the drive circuits 19 and 29 so as to stop power transmission to the power transmission coils 13 and 23.

  Thus, in a state in which the housing 21 is closed from the housing 11, power can be transmitted from the two power transmission coils 13 and 23 to the one power receiving coil 51. By using each power transmission coil 13, 23, it is possible to transmit a larger amount of power to the power receiving coil 51 than when only one power transmission coil is used. In order to perform power transmission efficiently, the control circuit 35 is configured so that each of the drive circuits 19, the AC magnetic flux penetrating from the first power transmission coil 13 and the second power transmission coil 23 to the power reception coil 51 always has the same direction. 29 is preferably controlled. Further, when power is transmitted to only one power receiving device, since the housing 21 is closed from the housing 11, the power transmitting device 10 can be made compact and a large space is required. And never. In addition, by closing the housing 21 from the housing 11, convenience is good when the power transmission device 10 is carried or moved.

  In addition, the second housing 21 has a structure that is pulled out from the inside of the first housing 11. Therefore, a stepped portion 37 is formed between the surface of the first housing 11 and the surface of the second housing 21 when the housing 21 is opened from the housing 11. The step portion 37 is configured such that the surface of the second housing 21 is lower than the surface of the first housing 11. By aligning the stepped portion 37 and the side surface of the power receiving device 60, the second power transmitting coil 23 and the power receiving coil 61 can be aligned. Further, a convex stepped portion 39 may be provided on the surface of the second housing 21, not between the surface of the first housing 11. Moreover, the power receiving device 60 can be easily placed at a predetermined position by providing the two convex stepped portions in non-parallel. Such a convex stepped portion for alignment may be provided on the surface of the first housing 11.

  In addition, although the permanent magnet 17 and the Hall element 27 are used as the detection means 33 for detecting the open / closed state of the casings 11 and 21, the state where the central axes of the power transmission coils 13 and 23 substantially coincide with each other and the power transmission coils. Any method may be used as long as it can be determined that 13 and 23 do not overlap. For example, a mechanical switch, MR sensor, photo interrupter, or the like may be used. The casings 11 and 21 are configured to be slidably connected to each other, but the configuration of the casings 11 and 21 is not limited to such an example. For example, the housings may be connected by hinges so that the housings are foldably connected. When the casings are folded and overlapped, the power transmission coils are arranged so that the central axes of the power transmission coils substantially coincide with each other, and the power transmission coils are controlled in synchronization. When each case is not folded, each power transmission coil is arranged so that the power transmission coils do not overlap each other, and each power transmission coil is controlled individually. As described above, the casing may be configured to be movable between a state in which the central axes of the power transmission coils arranged in the casings 11 and 21 substantially coincide with each other and a state in which the power transmission coils do not overlap.

  FIG. 6 shows a power transmission apparatus according to the second embodiment of the present invention. 6A is a schematic perspective view of the power transmission device and the power reception device, and FIG. 6B is a power transmission device and a power reception in a state where the housing is opened at the position along the line EE in FIG. 6A. FIG. 6C is a cross-sectional view of the device, and FIG. 6C is a cross-sectional view of the power transmitting device and the power receiving device in a state where the housing is closed at a position along the line EE in FIG. In addition, the same code | symbol is attached | subjected to the site | part which has the same function as a 1st Example, and description is abbreviate | omitted.

  The power transmission device according to the second embodiment is obtained by further providing an elastic body 41 that generates an urging force in a direction in which the pair of housings 11 and 21 are closed in the power transmission device according to the first embodiment. The elastic body 41 has one end connected to the first housing 11 and the other end connected to the second housing 21. Thereby, it is comprised so that urging | biasing force may arise in the X direction in a figure, ie, the direction which the housing | casings 11 and 21 close. The elastic body 41 is configured by, for example, a spring or rubber. Further, a step portion 37 is provided between the surface of the first housing 11 and the surface of the second housing 21. The step portion 37 is configured such that the surface of the second housing 21 is lower than the surface of the first housing 11. A convex stepped portion 39 is provided on the surface of the second housing 21. The step portions 37 and 39 are provided substantially in parallel.

  When the power receiving device 60 is mounted on the surface of the second housing 21 by opening the housing 21 from the housing 11, the housing 21 is moved from the housing 11 to the housing 11 as illustrated in FIGS. A biasing force is generated in the closing direction. With this urging force generated by the elastic body 41, the power receiving device 60 can be sandwiched between the stepped portions 37 and 39. Accordingly, even if the power receiving device 60 is used or the power transmitting device 10 is moved in a state where the power receiving device 60 is placed on the surface of the second housing 21, the position of the power receiving device 60 is shifted. Disappears. That is, it is possible to transmit power while fixing the position of the power receiving coil 61 with respect to the second power transmitting coil 23. In order to improve the power transmission efficiency, when the power receiving device 60 is fixed between the stepped portions 37 and 39, the coils are arranged so that the center axes of the second power transmitting coil 23 and the power receiving coil 61 are substantially coincident with each other. Is preferred. When the power receiving device 60 is not placed on the surface of the second housing 21, the housing 21 is closed from the housing 11 by the biasing force generated by the elastic body 41, as illustrated in FIG. Can be made compact. When the casing 21 is closed from the casing 11, the central axes of the power transmission coils 13 and 23 substantially coincide with each other, and larger power can be transmitted by simultaneously driving the power transmission coils 13 and 23.

DESCRIPTION OF SYMBOLS 10 Power transmission apparatus 11 1st housing | casing 13 1st power transmission coil 15 1st board | substrate 17 Permanent magnet 19 1st drive circuit 21 2nd housing | casing 23 2nd power transmission coil 25 2nd board | substrate 27 Hall element 29 2nd drive Circuit 31 Flexible substrate 33 Detection means 35 Control circuit 37, 39 Step part 41 Elastic body

Claims (5)

In a power transmission device provided with a power transmission coil for supplying power in a non-contact manner by electromagnetic induction to the power reception coil,
The casing houses two power transmission coils, and is configured to move between a state in which the central axes of the power transmission coils substantially coincide with each other and a state in which the power transmission coils do not overlap each other. apparatus. Detecting means for detecting the movable state of the housing; and a control circuit for controlling each of the power transmission coils based on a detection result of the detecting means;
The control means drives the power transmission coils simultaneously when the central axes of the power transmission coils substantially coincide with each other, and individually drives the power transmission coils when the power transmission coils do not overlap. Item 2. The power transmission device according to Item 1.   When the casing is composed of a pair of casings slidably connected to each other, the central axes of the power transmission coils substantially coincide with each other when the casing is closed, and the casing is open The power transmission device according to claim 1, wherein each of the power transmission coils slides so as not to overlap.   The power transmission device according to claim 3, wherein a step portion is provided between the pair of housings when the housing is opened.   An elastic body that generates an urging force in the closing direction of the casing is further provided, and the stepped portion is configured such that a surface of the other casing is lower than a surface of the one casing, and the other casing is a surface. The power transmission device according to claim 4, further comprising a convex portion disposed substantially parallel to the stepped portion.

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