JP4112474B2 - Contactless rechargeable equipment - Google Patents

Description

  The present invention relates to a contactless rechargeable device capable of charging a battery built in a device such as a mobile phone or an electric razor without contact, and a charger used therefor.

  In recent years, as a charger for charging batteries built into cordless devices (cordless devices) such as mobile phones, electric razor machines, desk cleaners, and remote controllers, the primary coil built into the charger and the secondary built into the device A contactless rechargeable device in which a coil is magnetically coupled is known. In this type of contactless rechargeable device, electric power can be supplied from the charger to the device by electromagnetic induction from the primary coil to the secondary coil without providing a contact point for electrically connecting the charger and the device. .

In this type of charger, as the cores of the primary coil and the secondary coil (magnetic cores such as ferrite cores), for example, those having shapes and arrangements as shown in FIGS. 3 and 4 are generally used.
3 and 4, reference numeral 110 is a charger, reference numeral 111 is a casing of the charger 110, reference numeral 112 is a primary coil, reference numeral 113 is a core of the primary coil, reference numeral 120 is a device charged by the charger 110, reference numeral Reference numeral 121 denotes a casing of the device 120, reference numeral 122 denotes a secondary coil, and reference numeral 123 denotes a core of the secondary coil. Here, a U-shaped core is adopted as the core 113 of the primary coil 112. Further, as the core 123 of the secondary coil 122, a rod-shaped core is employed in the configuration of FIG. 3, and a U-shaped core is employed in the configuration of FIG.
In the contactless rechargeable device described above, when the device 120 is placed on the charger 110, both end portions 114 and 124 of the cores 113 and 123 are brought close to each other to form a magnetic path. For this reason, the primary coil 112 and the secondary coil 122 are magnetically coupled via the cores 113 and 123 and can be charged.
JP 2003-18758 A

  In the non-contact rechargeable device as described above, the magnetic flux generated in the primary coil 112 reaches the secondary coil 122 through the core 113 on the charger 110 side and the core 123 on the device 120 side, but part of the magnetic flux is Since the leakage spreads outside the cores 113 and 123, there is a problem that the charging efficiency is reduced by the leakage magnetic flux. In addition, the leakage magnetic flux may generate heat around the periphery or adversely affect the operation of the device.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the non-contact rechargeable apparatus which can reduce the leakage magnetic flux from a core and can improve charging efficiency.

In order to solve the above-mentioned problems, the present invention charges the battery by electromagnetic induction by a primary coil built in the charger and a secondary coil built in a device including the battery charged by the charger. In the contactless rechargeable device to be performed, the core of the primary coil and the core of the secondary coil are arranged so that both end faces face each other, and the shape of the core of the primary coil is a rod-shaped base portion The U-shaped leg is bent at both ends, and the legs are narrowed as they are separated from the base, and the core of the secondary coil has a leg at both ends of the rod-shaped base. Provided is a non-contact rechargeable device characterized in that a U-shaped portion is bent and a shape in which both leg portions expand as the distance from the base portion increases.
In this contactless rechargeable device, the core of the primary coil and / or the secondary coil preferably has a rounded outer edge at the corner between the leg and the base.

According to the present invention, since the leg portion of the core of the primary coil is bent inward, the magnetic flux hardly spreads outside the core, and the generation of leakage magnetic flux can be suppressed. The magnetic flux is confined in the core, and the electrode can be supplied to the secondary coil more efficiently.
When the core has roundness at the outer edge of the corner between the leg and the base, the leakage magnetic flux from the corner can be suppressed, so that the effect of confining the magnetic flux in the core is further enhanced.

The present invention will be described below with reference to the drawings based on the best mode.
FIG. 1 is a schematic configuration diagram showing an example of a contactless rechargeable device of the present invention. 2A is a front view and FIG. 2B is a side view showing a core in the contactless rechargeable device of FIG. 1.
In FIG. 1, reference numeral 10 is a charger, reference numeral 11 is a housing (housing) of the charger 10, reference numeral 12 is a primary coil, reference numeral 13 is a core of the primary coil, reference numeral 20 is a device charged by the charger 10, reference numeral Reference numeral 21 denotes a housing (housing) of the device 20, reference numeral 22 denotes a secondary coil, and reference numeral 23 denotes a core of the secondary coil. The cores 13 and 23 are magnetic cores such as ferrite magnetic cores.

As shown in FIG. 2, as the cores 13 and 23 of the primary coil 12 and the secondary coil 22, U-shaped cores in which leg portions 17 and 27 are bent at both ends of the rod-like base portions 16 and 26 are employed. .
The core 13 of the primary coil 12 has a leg portion 17 that is bent inward from the base portion 16, and has a shape that narrows as the both leg portions 17 are separated from the base portion 16. In the core 13 of the primary coil 12, the internal angle θ ₁ formed by the central axis of the base portion 16 and the central axis of the leg portion 17 is an acute angle. The range of the magnitude of the angle θ ₁ is more preferably 60 to 85 °.
The core 23 of the secondary coil 22 has a leg portion 27 that is bent outward from the base portion 26, and has a shape that expands as the both leg portions 27 move away from the base portion 26. In the core 23 of the secondary coil 22, the internal angle θ ₂ formed by the central axis of the base portion 26 and the central axis of the leg portion 27 is an obtuse angle. The range of the magnitude of the angle θ ₂ is more preferably 95 to 120 °.
In the cores 13 and 23, the corners 18 and 28 between the base parts 16 and 26 and the leg parts 17 and 27 preferably have rounded outer edges.

  Both end portions 14 of the core 13 of the primary coil 12 are arranged facing the casing 11 of the charger 10. And in the state which put the bottom part of apparatus 20 on charger 10, both ends 24 of core 23 of secondary coil 22 are arranged so as to go to both ends 14 of core 13 of primary coil 12, respectively, Both end portions 14 and 24 of 23 are close to each other, and end surfaces 15 and 25 are arranged to face each other to form a magnetic path.

  The primary coil 12 and the secondary coil 22 are wound around the base portions 16 and 26 of the cores 13 and 23, respectively. As a method of winding the primary coil 12 or the secondary coil 22 around the cores 13 and 23, for example, a copper wire (conductive wire) is directly wound while the cores 13 and 23 are rotated around the longitudinal direction of the bases 16 and 26 as a central axis. A method is mentioned.

  The operation of the contactless rechargeable device M will be described. When the primary coil 12 is energized with power supplied from a power source (not shown), the secondary coil 22 is excited by electromagnetic induction, and power is supplied from the primary coil 12 to the secondary coil 22. By supplying the power supplied to the secondary coil 22 to the battery, the battery of the device 20 can be charged.

According to the rechargeable device configured as described above, since the leg portion of the core of the primary coil is bent inward, the magnetic flux hardly spreads outside the core, and generation of leakage magnetic flux can be suppressed. The magnetic flux is confined in the core, and the electrode can be supplied to the secondary coil more efficiently.
Further, when the corners 18 and 28 are rounded at the outer edge, the degree of the projection of the corners 18 and 28 to the outside of the magnetic path is reduced, so that leakage magnetic flux from the corners 18 and 28 can be suppressed. Therefore, the effect of confining the magnetic flux in the core is further enhanced, the charging efficiency can be further improved, and the generation of excess heat can be reduced.

Examples of the present invention will be described below. As shown in FIG. 2, the length A ₁ of the base portion 16 of the core 13 on the primary coil 12 side is 30.0 mm, the length B ₁ of the leg portion 17 of the core 13 is 18.5 mm, and the base portion 16 of the core 13 The inner angle θ ₁ formed by the central axis of the core and the central axis of the leg 17 is 85 °, the length A ₂ of the base 26 of the core 23 on the secondary coil 22 side is 25.0 mm, and the length of the leg 27 of the core 23 is B ₂ is 10.5 mm, the width W of both cores 13 and 23 (interval between the inner and outer peripheral surfaces) is 8.0 mm, the thickness T of both cores 13 and 23 is 15.0 mm, and the base of the core 23 The cores 13 and 23 were produced by setting the inner angle θ ₂ formed by the central axis of 26 and the central axis of the leg 27 to 95 °. When a contactless rechargeable device was manufactured using this, it was found that the battery had better charging characteristics than before.

Although the present invention has been described based on the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. .
For example, in the above-described embodiment, for each core, the corner between the base and the leg has a rounded outer edge, but the present invention is not limited to this. However, when the outer edge portion of the corner portion is rounded, the leakage magnetic flux from the corner portion can be suppressed, so that the effect of confining the magnetic flux in the core is further enhanced.
Further, the coil may be provided on the leg part of the core, or may be provided on both the base part and the leg part.

  The present invention can be applied to various home appliances and electronic devices such as mobile phones, electric razor machines, clippers, desk cleaners, irons, and remote controllers. The charger has both a function as a table on which the device is placed and a function of charging a battery built in the device.

It is a schematic block diagram which shows an example of the non-contact rechargeable apparatus of this invention. It is the (a) front view and (b) side view which show the core in the non-contact rechargeable apparatus of FIG. It is a schematic block diagram which shows an example of the conventional non-contact rechargeable apparatus. It is a schematic block diagram which shows the other example of the conventional non-contact rechargeable apparatus.

Explanation of symbols

M ... contactless rechargeable device, 10 ... charger, 12 ... primary coil, 13, 23 ... core, 15, 25 ... core end face, 16, 26 ... core base, 17, 27 ... core leg, 18 , 28 ... corners of the core, 20 ... equipment, 22 ... secondary coils.

Claims (2)

In a contactless rechargeable device for charging the battery by electromagnetic induction by a primary coil built in the charger and a secondary coil built in a device including a battery charged by the charger,
The core of the primary coil and the core of the secondary coil are arranged so that both end faces face each other,
The shape of the core of the primary coil is a U-shape in which legs are bent at both ends of a rod-shaped base, and the both legs are narrowed as they are separated from the base,
The shape of the core of the secondary coil is a U-shape in which legs are bent at both ends of a rod-like base, and the both legs are widened away from the base. Contactless rechargeable equipment.   2. The contactless rechargeable device according to claim 1, wherein the core of the primary coil and / or the secondary coil has a roundness at an outer edge portion of a corner portion between the leg portion and the base portion.

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