JP3182290B2 - Charging stand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic induction charging type electric device having a secondary battery and a secondary side charging coil inside a main body, for example, a charging stand for charging a rechargeable electric toothbrush.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 5-115324 discloses a step-down transformer of a charging circuit which is protruded upward as a charging stand capable of simultaneously charging a plurality of rechargeable electric devices including a secondary battery, for example, a plurality of electric toothbrushes. The stored circuit storage section, a base section provided integrally below the circuit storage section continuously over the front and side of the storage section, and an electric toothbrush body detachably mounted on the base section and detachable. And a plurality of toothbrush connections that are plugged into the device.

[0003]

However, in this charging stand, when charging a plurality of electric toothbrushes, each electric toothbrush must be individually inserted into the toothbrush connection part, which is very troublesome. Also, if a connection failure occurs due to insufficient insertion into the toothbrush connection, the electric toothbrush will be insufficiently charged.

It is an object of the present invention to provide a charging station that can easily and reliably charge a plurality of electromagnetic induction charging type electric devices at the same time.

[0005]

According to the present invention, there is provided a charging stand for charging an electromagnetic induction charging type electric device having a secondary battery and a secondary side charging coil inside a main body. A storage portion capable of being stored and held, and a primary charging coil provided to surround the storage portion and electromagnetically coupled to a secondary charging coil of the electric device stored in the storage portion are provided. It is characterized by the following.

Further, the storage portion is formed in a bottomed cylindrical shape.
When the primary side charging coil is arranged on the outer periphery,
In addition, a projection is provided substantially at the center of the bottom.

[0007]

According to the present invention, when a plurality of electromagnetic induction charging type electric devices are stored in the storage section, the secondary charging coils in each of the electric devices are electromagnetically coupled to the primary charging coils and are simultaneously charged. Is done. And the presence of the projection provided on the bottom of the storage
Therefore, electrical equipment is stored while being guided near the outer periphery of the storage unit.
Will be delivered. As a result, the charging coil on the secondary side of the electrical equipment is 1
Generated in the vicinity of the secondary charging coil, that is, in the primary charging coil
Located in a region where the magnetic flux density of the high-frequency magnetic field
The secondary side charging coil will supply sufficient charging current
appear.

[0008]

1 and 2 are a perspective view and a sectional view of an essential part showing an embodiment of the present invention. 1 is an electric toothbrush as an electromagnetic induction rechargeable electric device, 2 is a main body of the electric toothbrush 1, 3 is a brush portion detachably attached to a tip of the main body 2, 4 is provided on a side surface of the main body 2. Drive switch,
Reference numeral 5 denotes a secondary-side charging coil provided at the bottom of the main body 2. As the secondary-side charging coil 5, a commercially available choke coil may be used. Reference numeral 6 denotes a secondary battery disposed above the secondary charging coil 5. Further, in the main body 2, although not shown, a motor and a driving mechanism for driving the brush 3 in the up-down direction and for driving the vibration are provided. Then, when the drive switch 4 is turned on, the motor is driven by the charged secondary battery 6, and the brush unit 3 is driven.

On the other hand, reference numeral 10 denotes a charging stand of the present invention, which is formed in a cup shape having a diameter capable of accommodating a plurality of electric toothbrushes 1 at the same time. It comprises a bottomed cylindrical case B which is screwed and forms a lower part, and a cylindrical transparent case C which is fitted above the case B and forms an upper part. Reference numeral 11 denotes a storage portion formed on the upper surface of the case B, and stores and holds a plurality of electric toothbrushes 1 in combination with the case C. Reference numeral 12 denotes a mountain-shaped projection formed substantially at the center of the storage unit 11.
Is a ring-shaped 1 provided to surround the storage section 11.
The secondary charging coil 14 is disposed below the storage unit 11 and
An inverter circuit for driving the secondary charging coil 13 at a high frequency;
An AC cord 15 is connected to a commercial power supply and supplies power to the inverter circuit 14.

The charging operation of the electric toothbrush 1 according to the present invention will be described below with reference to FIGS.
When the cord 15 is connected to the commercial power source and the inverter circuit 14 is started, the inverter circuit 14
3 is driven at high frequency. Along with this, a high-frequency magnetic field is generated around the primary side charging coil 13 as shown by the magnetic force lines in FIG. In this state, the electric toothbrush 1 is
When the secondary charging coil 5 is inserted into the storage unit 11 and is stored in the storage unit 11, the secondary charging coil 5 is located in the region of the high-frequency magnetic field generated by the primary charging coil 13, And a charging current is generated in the secondary charging coil 5.
The charging current charges the secondary battery 6.

Here, as shown in FIG. 3, the magnetic flux density of the high-frequency magnetic field generated around the primary side charging coil 13 is very weak in the substantially central portion of the storage section 11, so that the secondary battery 6 can be sufficiently charged. There is a possibility that a charging current necessary for charging the secondary side charging coil 5 will not be generated. Therefore, in the present invention, the mountain-shaped projection 12 is formed substantially at the center of the storage section 11 as described above. Therefore, the bottom of the electric toothbrush 1 inserted into the charging stand 1 is located around the storage section 11 so as to be guided by the mountain-shaped projection 12. In other words, the secondary charging coil 5 of the electric toothbrush 1 is located near the primary charging coil 13, that is, in a region where the magnetic flux density of the high-frequency magnetic field generated by the primary charging coil 13 is sufficiently strong. This means that the secondary side charging coil 5
Generates a sufficient charging current.

[0012]

According to the present invention, in a charging stand for charging an electromagnetic induction charging type electric device having a secondary battery and a secondary side charging coil inside a main body, a plurality of the electric devices are stored and held. Since there is provided a possible storage unit and a primary charging coil provided to surround the storage unit and electromagnetically coupled to a secondary charging coil of the electric device stored in the storage unit. In addition, a plurality of electromagnetic induction rechargeable electric devices can be charged simultaneously and easily and reliably. And income
Due to the presence of the protrusion at the bottom of the housing, electrical equipment is stored
It is stored while being guided near the outer periphery of the part. as a result,
The secondary charging coil of electrical equipment is near the primary charging coil.
Side, that is, the high-frequency magnetic field generated by the primary side charging coil
The magnetic flux density is located in a sufficiently strong region, and 2
The secondary charging coil generates a sufficient charging current.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 3 is a schematic diagram showing the operation principle of one embodiment of the present invention.

FIG. 4 is a block diagram showing a circuit according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric toothbrush 5 Secondary charging coil 6 Secondary battery 10 Charging stand 11 Holder 12 Projection 13 Primary charging coil

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02J 7/00 301 A46B 13/02 H01F 38/14

Claims (1)

(57) [Claims] 1. A charging stand for charging an electromagnetic induction charging type electric device having a secondary battery and a secondary side charging coil inside a main body, a storage portion capable of storing and holding a plurality of said electric devices, A primary-side charging coil that is provided so as to surround the storage portion and is electromagnetically coupled to a secondary-side charging coil of the electric device stored in the storage portion ;
The storage part is formed in a cylindrical shape with a bottom, and the
Place the primary side charging coil, and almost in the center of the bottom
A charging stand comprising a projection .