JP5486773B2 - Non-contact transmission device and non-contact transmission system - Google Patents

Description

  The present invention relates to a non-contact transmission apparatus that transmits charging power or information in a non-contact manner to an electronic device, and a non-contact transmission system using the non-contact transmission apparatus.

  In recent years, a magnetic flux is induced from the primary side (charging device side) to the secondary side (electronic device side), and the secondary side coil provided on the secondary side is interlinked with the secondary side coil. There is known a non-contact transmission system capable of transmitting charging power or information to charge an electronic device (for example, an electronic timepiece) in a non-contact manner or sending information to the electronic device. For example, when charging a wristwatch (electronic device), the wristwatch is placed on a charger (charging device), and the output of the oscillation circuit in the case of the charger is input to the primary coil to generate magnetic flux in the core. A technique for charging the wristwatch by generating a current in a secondary coil of the wristwatch by electromagnetic induction in the magnetic flux, rectifying the current by a rectifier circuit, and storing charging power in a storage battery is disclosed (for example, , See Patent Document 1).

  FIG. 9 is an example of a cross-sectional view showing a configuration of a contactless transmission system in the prior art. FIG. 9 shows a case where the charging device 1000 on the primary side charges the electronic timepiece 200 (electronic device) on the secondary side. As shown in FIG. 9, the magnetic flux M generated from the primary side coil 1010 and the primary side core 1020 in the charging apparatus 1000 passes through the back cover 250 which is a part of the casing of the electronic timepiece 200, and is secondary It is linked to the secondary coil 210 wound around the side core 220. The back cover 250 of the electronic timepiece 200 is generally formed of a metal such as titanium or stainless steel.

JP 2004-28777 A

Here, it is desirable that the larger the current flowing through the secondary coil, that is, the charging power to be transmitted, is, the faster the electronic device can be charged. It has become to. However, when the input charging power is increased, the copper loss W generated in the primary coil also increases at the same time. The copper loss W can be represented by W = RI ² where I is the current flowing through the coil and R is the DC resistance value of the primary coil.

  The greater the copper loss W, the greater the heat generated in the primary coil. If the heat generated in the primary side coil increases, the heat generation of the casing of the electronic device on the secondary side disposed in the vicinity thereof also increases at the same time. In particular, since the back cover, which is a part of the casing of the electronic device, is formed of a metal such as titanium or stainless steel as described above, it is easily affected by the heat generated by the primary coil. For example, in the prior art of FIG. 9, the region H is a heat generation region. Therefore, such a non-contact transmission system according to the prior art may cause a burn to the user of the electronic device due to heat generation of the case of the electronic device, and use the electronic device until the heat falls. There was a problem that I could not.

  The present invention has been made in view of the above. When charging power or information is transmitted to an electronic device, the heat generated in the housing of the electronic device can be generated without changing the material forming the housing of the electronic device. An object of the present invention is to provide a non-contact transmission device and a non-contact transmission system that can be reduced.

In order to solve the above-described problems and achieve the object, the invention according to claim 1 is a non-contact method for transmitting charging power or information in a non-contact manner to an electronic device having a sending / receiving core around which a sending / receiving coil is wound. In the transmission apparatus, the transmission side core disposed substantially coaxially with the transmission / reception side core and the transmission side core are wound around the transmission side core to generate a magnetic flux together with the transmission side core. A transmission side coil that generates an induced electromotive force to transmit the charging power or information to the electronic device, and a surface that faces the electronic device in the transmission side coil between the transmission side coil and the electronic device. It has a coating surface to be coated and a heat insulating member for suppressing the heat transfer to the electronic apparatus of the heat generated from the transmission coil, the coating surface, that you have been formed in generally annular shape Characterize

The invention according to claim 2 is the non-contact transmission system, and wherein the non-contact transmission device of claim 1, further comprising a said electronic device.

  According to the present invention, by including a heat insulating member having a covering surface that covers a surface of the transmission side coil that faces the electronic device, heat transfer from the transmission side coil to the electronic device can be suppressed. Therefore, when charging power or information is transmitted to the electronic device, there is an effect that heat generation in the housing of the electronic device can be reduced without changing the material forming the housing of the electronic device.

  Exemplary embodiments of a non-contact transmission apparatus according to the present invention and a non-contact transmission system including the non-contact transmission apparatus and an electronic device will be described below in detail with reference to the accompanying drawings. Hereinafter, an example in which the non-contact transmission device is applied to a charging device that transmits charging power to an electronic device will be described. However, the present invention is not limited thereto, and any device that can transmit charging power or information can be used. The non-contact transmission device can be applied.

  In addition, in the following, an example in which an electronic device charged in a charging device as a non-contact transmission device is applied to an electronic timepiece will be described. However, the present invention is not limited to this example. Any device that has a secondary battery, such as an electric toothbrush, that can be charged by the charging device (non-contact transmission device) of the present invention, or that can exchange information from the non-contact transmission device can be used as an electronic device. Is possible.

(Embodiment 1)
The charging device according to the first embodiment transmits charging power to an electronic timepiece (electronic device) in a non-contact manner using electric power supplied from an AC power source or the like. FIG. 1 is a cross-sectional view illustrating an example of the configuration of the charging device and the electronic timepiece according to the first embodiment. FIG. 2 is a top view illustrating an example of the configuration of the charging device and the electronic timepiece according to the first embodiment. 1 and FIG. 2 show configurations relating to a power transmission portion in the charging device 100 and a power receiving portion in the electronic timepiece 200, and other configurations are omitted.

  First, the electronic timepiece 200 will be described. As shown in FIGS. 1 and 2, the power receiving portion of the electronic timepiece 200 mainly includes a secondary side core 220, a secondary side coil 210, and a back cover 250.

  The secondary-side core 220 is a ferrite core or the like whose main component having magnetic properties is formed of a manganese-based metal. When receiving the charging power from the charging device 100, the secondary-side core 220 and the primary-side core 120 of the charging device 100 Oppositely arranged on the same axis.

  The secondary coil 210 is an electric wire wound around the secondary core 220 and generates magnetic flux together with the secondary core 220.

The back cover 250 is provided on the opposite side (back side) of the dial of the electronic timepiece 200, and covers the secondary side core 220, the secondary side coil 210, and other components constituting the electronic timepiece 200. . Further, when receiving charging power from the charging device 100, the back cover 250 is disposed between the charging device 100 and the secondary core 220 because the charging device 100 and the back side of the electronic timepiece 200 are disposed to face each other. Will be provided. Moreover, back cover 250 is formed of titanium or stainless.

  Next, the charging device 100 will be described. As shown in FIGS. 1 and 2, the power transmission portion of the charging device 100 mainly includes a primary side core 120, a primary side coil 110, and a heat insulating material 130.

  The primary side core 120 is a ferrite core or the like whose main component having magnetic properties is formed of a manganese-based metal. When the charging power is transmitted to the electronic timepiece 200, the primary side core 120 Oppositely arranged on the same axis.

  The primary side coil 110 is an electric wire wound around the primary side core 120, and generates a magnetic flux together with the primary side core 120.

  The heat insulating material 130 is formed of a material such as glass wool, urethane foam, or cellulose. When the charging power is transmitted from the charging device 100 to the electronic timepiece 200, heat generated from the primary coil 110 is transferred to the electronic timepiece 200. It suppresses. The heat insulating material 130 is disposed between the primary side coil 110 and the back cover 250 of the electronic timepiece 200 when the charging power is transmitted from the charging device 100 to the electronic timepiece 200. It has a covering surface that covers the surface facing 200. With this configuration, even if heat is generated in the primary side coil 110, heat transfer to the electronic timepiece 200 can be suppressed by the heat insulating material 130. Therefore, the housing of the electronic timepiece 200 on the secondary side can be suppressed. Heat generation of the body can be suppressed.

  Further, the covering surface of the heat insulating material 130 is formed in substantially the same shape as the surface facing the electronic timepiece 200 in the primary coil 110, that is, in a substantially annular shape having an air space inside. With such a configuration, when transmitting charging power to the electronic timepiece 200, the magnetic flux M (see FIG. 1) generated from the primary side coil 110 and directed to the electronic timepiece 200 via the primary side core 120 is Instead of passing through the heat insulating material 130 itself, it can pass through the airspace provided inside and interlink with the secondary coil 210. Accordingly, the heat insulating material 130 does not prevent the magnetic flux M directed to the secondary coil 210, and the transmission efficiency of the conventional non-contact transmission system is not reduced.

  Here, a charging method from the charging apparatus 100 to the electronic timepiece 200 will be described. On the charging device 100 side, the power supplied from an AC power source or the like is rectified from alternating current to direct current, and the rectified power is converted into alternating current, and then the primary side coil wound around the primary side core 120 110, and a magnetic flux is generated by the primary core 120 and the primary coil 110 (see magnetic flux lines M in FIG. 1). Then, by generating an AC electromagnetic field (induced electromotive force) in the secondary coil 210 of the electronic timepiece 200 by the generated magnetic flux, electric power is transmitted to the electronic timepiece 200 in a non-contact manner.

  On the other hand, on the electronic timepiece 200 side, the AC electromagnetic field generated in the primary coil 110 is detected, and an induced electromotive force corresponding to the AC electromagnetic field is generated, so that power is received from the charging device 100 in a non-contact manner. . Then, the received power is rectified into a direct current and stored in a secondary battery (not shown) as charging power.

  As described above, in the charging device 100 according to the first embodiment, the primary coil is provided with the heat insulating material 130 having the covering surface that covers the surface of the primary coil 110 that faces the electronic timepiece 200. Heat transfer from the heat generated from 110 to the electronic timepiece 200 can be suppressed. Therefore, when charging power (or information) is transmitted to the electronic timepiece 200, heat generation in the case of the electronic timepiece 200 is performed without changing the material forming the back cover 250 that forms the case of the electronic timepiece 200. Can be reduced.

  Further, by forming the heat insulating material 130 in a substantially annular shape, the magnetic flux M directed to the electronic timepiece 200 through the primary side core 120 does not pass through the heat insulating material 130 itself, and an air space provided inside is formed. It can pass through and interlink with the secondary coil 210. Therefore, the heat insulating material 130 does not hinder the magnetic flux M toward the secondary coil 210, and the transmission efficiency of the conventional non-contact transmission system is not reduced.

  In the present embodiment, the charging power is transmitted from the substantially circular charging device 100 to the electronic timepiece 200, but is not limited to such a shape. FIG. 3A is an explanatory diagram illustrating another example of a contactless transmission system including a charging device and an electronic timepiece. 3-2 is a diagram in which the charging device and the electronic timepiece in FIG. 3-1 are separated. For example, as illustrated in FIGS. 3A and 3B, the charging device 300 including the primary core 320 and the primary coil 310 and the back cover 450 of the electronic timepiece face each other in close proximity. You may apply to a non-contact transmission system, ie, a mat type non-contact transmission system.

(Embodiment 2)
The charging apparatus according to the first embodiment suppresses heat transfer to the electronic timepiece when the charging power is transmitted to the electronic timepiece by providing a heat insulating material. On the other hand, in the charging apparatus according to the second embodiment, when charging power is transmitted to the electronic timepiece by filling the gap provided between the primary coil and the casing of the charging apparatus with air. This suppresses heat transfer to the electronic timepiece.

  Similar to the first embodiment, the charging device according to the second embodiment transmits charging power to the electronic timepiece in a non-contact manner using electric power supplied from an AC power source or the like. FIG. 4 is a cross-sectional view illustrating an example of the configuration of the charging device and the electronic timepiece according to the second embodiment. Note that FIG. 4 shows a configuration related to a power transmission portion in the charging device 500 and a power receiving portion in the electronic timepiece 200, and other configurations are omitted. The configuration and function of the electronic timepiece 200 and the charging method from the charging device to the electronic timepiece are the same as those in the first embodiment, and thus the description thereof is omitted.

  Next, the charging apparatus 500 will be described. As shown in FIG. 4, the power transmission portion of the charging device 500 mainly includes a primary side core 120, a support member 540, a primary side coil 510, and a housing 550. Here, the configuration and function of the primary-side core 120 are the same as those in the first embodiment, and thus description thereof is omitted.

  The support member 540 is formed of a nonmetal such as resin and is bonded to the outer periphery of the primary core 120. Further, the support member 540 has a stepped portion formed by cutting out the outer periphery on the electronic timepiece 200 side, and the primary side coil 510 is wound around the stepped portion, and the wound primary side coil 510 is attached. To support.

  The primary side coil 510 is supported by the support member 540 by being wound around a step portion on the outer periphery of the support member 540, and generates a magnetic flux together with the primary side core 120.

  The housing 550 surrounds the primary side core 120, the support member 540, the primary side coil 510, and other components of the charging device 500. A gap is provided between the case 550 and the primary side coil 510. Yes. In a region (region S1) that is a part of the gap and surrounds the outer periphery of the primary coil 510, the support member 540, and the primary core 120, heat electrons generated from the primary coil 510 are generated. Air is filled as a substance that suppresses heat transfer to the timepiece 200, and serves as a heat insulating portion.

  Referring to FIG. 4, in region S <b> 1, primary side coil 510, support member 540, and primary side core 120 are surrounded by air, and casing 550 is formed to surround region S <b> 1. Yes.

  Here, the thermal conductivity serving as an index of heat transfer will be described. It is generally known that the thermal conductivity decreases in the order of liquid, solid, and gas, and the thermal conductivity of air, which is a gas, is very small. However, when convection is generated by the movement of air, heat is transmitted by the convection. Therefore, in the present embodiment, air movement, that is, air convection is prevented by sealing and enclosing the area S1 filled with air with the housing 550 of the charging device 500 as described above. It is out. Therefore, the charging device 500 of the present embodiment effectively uses air having a very low thermal conductivity as a heat insulating portion, and efficiently suppresses heat transfer from the heat generated in the primary coil 510 to the electronic timepiece 200. be able to.

  As described above, in the charging apparatus 500 according to the second embodiment, the housing 550 further surrounds the region S1 in which the primary coil 510, the support member 540, and the primary core 120 are surrounded by air. Heat transfer from the primary coil 510 to the electronic timepiece 200 is suppressed. Therefore, when charging power (or information) is transmitted to the electronic timepiece 200, heat generation in the case of the electronic timepiece 200 is performed without changing the material forming the back cover 250 that forms the case of the electronic timepiece 200. Can be reduced.

  Further, since the support member 540 is formed of a non-metal such as resin, it does not serve as a shield for the magnetic flux generated from the primary side core 120 and the primary side coil 510. Heat generation can be suppressed without lowering.

  Further, by adopting the configuration as in the present embodiment, the configuration of the charging device in the prior art is not significantly changed, so that an increase in manufacturing cost of the charging device can be prevented.

  In the present embodiment, the gap provided between the housing 550 and the primary coil 510 is filled with air to form a heat insulating portion. However, the present invention is not limited to this. For example, a heat insulating material formed of a material such as glass wool, urethane foam, or cellulose as described in Embodiment 1 in a gap provided between the housing 550 and the primary coil 510 is used as the heat insulating material. It is good also as a structure filled as a part.

(Embodiment 3)
In the charging device according to the second embodiment, the air when the charging power is transmitted in a non-contact manner to the electronic timepiece by filling the gap provided between the primary coil and the casing of the charging device with air. Heat transfer to the watch was suppressed. On the other hand, in the charging apparatus according to the third embodiment, the heat generated from the primary coil is cooled by filling water in the gap provided between the primary coil and the casing of the charging apparatus. Then, heat transfer to the electronic timepiece is suppressed when charging power is transmitted to the electronic timepiece in a non-contact manner.

  Similar to the first embodiment, the charging device according to the third embodiment transmits charging power to an electronic timepiece in a non-contact manner using electric power supplied from an AC power source or the like. FIG. 5 is a cross-sectional view illustrating an example of the configuration of the charging device and the electronic timepiece according to the third embodiment. Note that FIG. 5 shows a configuration related to a power transmission portion in the charging device 600 and a power receiving portion in the electronic timepiece 200, and other configurations are omitted. The configuration and function of the electronic timepiece 200 and the charging method from the charging device to the electronic timepiece are the same as those in the first embodiment, and thus the description thereof is omitted.

  Next, the charging device 600 will be described. As shown in FIG. 5, the power transmission portion of the charging device 600 mainly includes a primary side core 620, a heat sink 640, a primary side coil 610, and a housing 650. Here, since the primary side core 620 is the same as the structure and function of the primary side core 120 of Embodiment 1, description is abbreviate | omitted.

  The heat sink 640 has a plurality of heat radiation fins of two different lengths and is provided on the outer periphery of the primary side core 620. Specifically, it is composed of two types of radiating fins having different lengths, whereby a step portion is formed on the outer periphery of the electronic timepiece 200 side, and a primary coil 610 is wound around the step portion. Then, diffusion of heat generated in the primary side coil 610 is aided by a close contact portion between the heat sink 640 and the wound primary side coil 610. The heat sink 640 is made of a nonmagnetic material. By forming with such a material, the magnetic flux can be directed to the electronic timepiece 200 without changing the direction of the magnetic flux generated from the primary core 620.

  The primary side coil 610 is supported by the heat sink 640 to generate a magnetic flux together with the primary side core 620 by being wound around a step portion on the outer periphery of the heat sink 640.

  The housing 650 surrounds the primary side core 620, the heat sink 640, the primary side coil 610, and other components of the charging device 600, and a gap is provided between the primary side coil 610. . A region (region S2) that is a part of the gap and surrounds the lower portion of the heat sink 640 and the outer periphery of the primary core 620 is filled with water as a substance that cools the heat sink 640. It plays the role of a heat insulating part that suppresses heat transfer from the side coil 610 to the electronic timepiece 200.

  Referring to FIG. 5, in the region S2, the lower part of the heat sink 640 is configured to be immersed in the water L, and the housing 650 is formed so as to surround the region S2. The water L is preferably distilled water in order to prevent corrosion of the charging device 600 and the like.

  Here, a flow of suppressing heat transfer to the electronic timepiece 200 by the charging device 600 will be described. First, when charging power is transmitted from the charging device 600 to the electronic timepiece 200, heat is radiated from the close contact portion between the heat sink 640 and the primary coil 610. In general, since a member formed of a uniform material diffuses heat uniformly, when the heat sink 640 is formed of a uniform material, the temperature rises further in the vicinity of the primary coil 610. The heat released from the part is uniformly diffused to the heat sink 640 and the temperature of the entire heat sink 640 rises, not just a part near the primary coil 610.

  Next, when the water L (heat insulating part) filled in the region S2 soaks the heat sink 640 absorbs the heat of the heat sink 640, the heat sink 640 is cooled and the temperature drops to about the same temperature as the water L. At this time, since water has a large specific heat, a large amount of heat can be absorbed, and the heat sink 640 can be remarkably suppressed.

  As described above, in the charging apparatus 600 according to the third embodiment, the heat sink 640 that diffuses the heat generated from the primary side coil 610 is cooled by water, so that the electronic timepiece of the heat generated from the primary side coil 610 is obtained. Heat transfer to 200 is suppressed. Therefore, when charging power (or information) is transmitted to the electronic timepiece 200, heat generation in the case of the electronic timepiece 200 is performed without changing the material forming the back cover 250 that forms the case of the electronic timepiece 200. Can be reduced.

  Further, since the heat generated from the primary side coil 610 is diffused and absorbed by the heat sink 640 and the water L, not only the heat generation of the electronic timepiece 200 is suppressed, but also only a part of the heat sink 640 near the primary side coil 610. The temperature can be suppressed uniformly without unevenness.

  Further, by forming the heat sink 640 from a non-magnetic material, the magnetic flux can be directed to the electronic timepiece 200 without changing the direction of the magnetic flux generated from the primary side core 620.

(Embodiment 4)
In a charging device for charging an electronic device, it is desired to suppress heat generation of the electronic device, and usually design and comfort are also desired. Therefore, the charging device according to the fourth embodiment takes into consideration design and comfort in addition to suppressing heat generation of the electronic device.

  The charging device according to the fourth embodiment is the same as the charging device described in the second and third embodiments. The amount of air filled in the gap between the primary coil and the housing, the amount of water, and the heat sink The volume is adjusted so that the temperature rise of the charging device and the electronic device is within the specified value of the non-contact transmission system. Here, the specified value of the non-contact transmission system indicates a predetermined temperature reference as a limit range of the temperature rise of the corresponding device or device.

  When it is desired to transmit a large amount of charging power to the electronic device without changing the configuration of the charging device and the electronic device, a method of increasing the current input in the charging device can be considered. However, when such a method is adopted, the current loss in the charging device is increased, and at the same time, the copper loss generated in the primary coil of the charging device is also increased.

  FIG. 6 is a diagram illustrating the relationship between the temperature rise and time in the non-contact transmission system. As shown in FIG. 6, when the method of increasing the current input in the charging device as described above is employed, the predetermined value of the contactless transmission system may be exceeded (curve a). reference). Therefore, when the charging device has the configuration shown in the first to third embodiments, the temperature rise can be suppressed within the specified value of the non-contact transmission system (see curve b).

  Originally, it is preferable that the temperature rise of the non-contact transmission system is as low as possible. However, it is considered to be a disadvantage that the design and comfort of the charging device are impaired in order to take the temperature rise. In the fourth embodiment, the volume of air, water, and heat sink filled in the gaps provided in the charging devices shown in the second and third embodiments (see FIGS. 4 and 5), and the volume of water and heat sink are adjusted. By configuring the temperature increase to fall within the specified value of the contact transmission system, the charging device is not enlarged more than necessary, and as shown by the curve c in FIG. It is possible to satisfy the specified value at the same time.

  7 and 8 are cross-sectional views illustrating examples of configurations of the charging device and the electronic timepiece according to the fourth embodiment. In FIG. 7, it is configured such that the temperature rise is kept within the specified value of the non-contact transmission system while reducing the air filled in the gap provided in the charging device in FIG. Specifically, the area S3 in FIG. 7 is made smaller than the area S1 in FIG. 4, thereby reducing the size of the housing 750 and the like, thereby reducing the size of the charging device 700. In FIG. 8, the water L charged in the gap provided in the charging device in FIG. 5 is reduced, and the temperature rise is set within the specified value of the non-contact transmission system. Specifically, the size of the casing 850 is reduced by making the area S4 in FIG. 8 smaller than the area S2 in FIG.

  As described above, since the charging device according to the fourth embodiment can be configured to be downsized as described above, a large number of charging devices can be arranged even in a space where the arrangement space is limited. In addition, it is possible to prevent heat generation of the charging device, improve the comfort of the user who uses the charging device, and improve the design of the designer.

1 is a cross-sectional view illustrating an example of the configuration of a charging device and an electronic timepiece according to a first embodiment. FIG. 3 is a top view illustrating an example of the configuration of the charging device and the electronic timepiece according to the first embodiment. It is explanatory drawing which shows another example of the non-contact transmission system provided with the charging device and the electronic timepiece. It is the figure which isolate | separated the charging device and electronic timepiece in FIGS. It is sectional drawing which shows an example of a structure of the charging device and electronic timepiece concerning Embodiment 2. FIG. FIG. 6 is a cross-sectional view illustrating an example of a configuration of a charging device and an electronic timepiece according to a third embodiment. It is a figure which shows the relationship between the temperature rise part and time in a non-contact transmission system. FIG. 6 is a cross-sectional view illustrating an example of a configuration of a charging device and an electronic timepiece according to a fourth embodiment. FIG. 6 is a cross-sectional view illustrating an example of a configuration of a charging device and an electronic timepiece according to a fourth embodiment. It is an example of sectional drawing which shows the structure of the non-contact transmission system in a prior art.

Explanation of symbols

100, 300, 500, 600, 700, 800 Charging device 110, 310, 510, 610 Primary side coil 120, 320, 520, 620 Primary side core 130 Heat insulating material 200 Electronic watch 210 Secondary side coil 220 Secondary side Core 250, 450 Back cover 540 Support member 550, 650 Case 640 Heat sink

Claims (2)

In a non-contact transmission device that transmits charging power or information in a non-contact manner to an electronic device having a sending / receiving core wound with a sending / receiving coil.
A transmission side core disposed substantially coaxially with the delivery side core; and
A transmission side coil that is wound around the transmission side core and generates a magnetic flux together with the transmission side core, thereby generating an induced electromotive force in the transfer side coil and transmitting the charging power or information to the electronic device,
Between the transmission side coil and the electronic device, there is a covering surface that covers a surface of the transmission side coil that faces the electronic device, and heat generated from the transmission side coil is transferred to the electronic device. A heat insulating member for suppressing
With
The said contact surface is formed in the substantially annular shape, The non-contact transmission apparatus characterized by the above-mentioned. A contactless transmission device according to claim 1 ;
The electronic device;
A non-contact transmission system comprising:

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