JPH11260658A - Power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve transmission rate of a power transmitted from a primary circuit to a secondary circuit and making main body size smaller on which the secondary circuit is mounted by making the secondary circuit coil smaller in contribution to the down-sizing of the main body. SOLUTION: A first coil (primary-side circuit coil) L1 is provided being mounted on, first main frame and supplied with a current and a second coil (secondary-side circuit coil) L2, mounted on the second main frame, to which power is transmitted from the first coil. The first coil L1 and the second coil L2 use T-shaped magnetic cores 11 and 16 respectively. Wirings 12 and 17 are provided around the protrusions of the T-shaped magnetic cores 11 and 16. The protrusions of the T-shaped magnetic cores 11 and 16 of the first coil L1 and the second coil L2 are placed so as to face each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cordless telephone,
The present invention relates to a non-contact type power supply device used for a portable device such as a mobile phone and a PHS.

[0002]

2. Description of the Related Art In a non-contact type power supply device, a primary circuit on a charging side and a secondary circuit on a charging side are mounted in a completely independent casing, and a primary side circuit is supplied by a current supplied from a power supply. A magnetic flux is generated in the coil of the circuit, and an induced electromotive force is generated in the coil of the secondary circuit on the charging side by a change in the magnetic flux of the coil of the primary circuit. Then, the induced electromotive force is rectified and used as a DC power supply for a portable device or the like. In such a non-contact type power supply, it is important that the coupling between the coil of the primary circuit and the coil of the secondary circuit be tight in order to efficiently transmit power from the charging side to the charging side. Becomes As a means to make the coupling between the coil of the primary circuit and the coil of the secondary circuit dense, the air gap between the coil of the primary circuit and the coil of the secondary circuit should be adjusted to the air gap between the coil of the primary circuit and the secondary circuit. The opposing area of the coil of the side circuit is made sufficiently large. FIG. 5 is a cross-sectional view showing an example of a conventional non-contact type power supply device, in which a primary circuit coil L7 mounted in a housing 58 of a charger and a coil L7 mounted in a housing 59 of a main body. The coil L8 of the secondary circuit is formed by applying windings 52 and 57 to E-shaped magnetic cores 51 and 56, respectively. The magnetic flux emitted from the coil L7 of the primary circuit is
The electric power is transmitted to the E-shaped magnetic core 56 and the winding 57 of the coil L8 of the secondary circuit.

[0003]

It is desired to reduce the size of a portable device using this type of power supply device so that the portable device is convenient to carry. In such a situation, when only the coil L8 of the secondary circuit mounted in the housing 59 of the main body is downsized, the E-shaped magnetic core 51 constituting the coil L7 of the primary circuit is reduced. Middle leg and coil L8 of secondary circuit
Since the distance between the outer legs of the E-shaped magnetic core 56 constituting the E-shaped magnetic core 56 becomes smaller, the magnetic flux emitted from the middle leg of the E-shaped magnetic core 51 The magnetic flux transmitted to the outer legs and passing through the middle leg and the outer legs of the E-shaped magnetic core 56 cancel each other, and there is a problem that the power transfer rate from the charger to the main body is extremely deteriorated. In order to solve such a problem, as shown in FIG.
And a coil L10 of a secondary circuit formed by applying windings 62 and 67 to I-shaped magnetic cores 61 and 66, respectively. In such a power supply device, since the magnetic circuit is an open magnetic circuit, the coil L of the primary side circuit is indicated by a dotted line.
The magnetic flux of No. 9 is also emitted from the end of the I-type magnetic core 61 on the side opposite to the coil L10 of the secondary circuit. Also, a part of the magnetic flux emitted from the coil L9 of the primary circuit to the coil L10 of the secondary circuit is changed to the coil L10 of the secondary circuit.
Will not interlink. Therefore, this power supply device has a problem that the power transmission efficiency from the charger to the main body is deteriorated, and a predetermined power cannot be obtained in the secondary circuit mounted on the main body. To solve these problems, FIG.
As shown in the figure, the coil L11 of the primary circuit is formed by applying a winding 72 to an I-shaped magnetic core 71, and the coil L12 of the secondary circuit is formed by applying a winding 77 to a T-shaped magnetic core 76. Some are formed by application. Since such a power supply device uses a T-shaped magnetic core for the coil L12 of the secondary circuit, it can efficiently pick up the magnetic flux emitted by the coil L11 of the primary circuit as shown by the dotted line. . However, since the coil L11 of the primary circuit uses the I-type magnetic core 71, the magnetic flux is also emitted to the opposite side of the coil L12 of the secondary circuit. Accordingly, there is a problem that the magnetic flux generated by the winding 72 of the coil L11 of the primary circuit cannot be efficiently transmitted to the coil L12 of the secondary circuit.

The present invention can improve the transmission efficiency of power transmitted from a primary circuit to a secondary circuit, and reduce the shape of a coil of the secondary circuit to mount the secondary circuit. It is an object of the present invention to provide a power supply device that can contribute to downsizing.

[0005]

A power supply device according to the present invention is mounted in a first housing and provided with a first coil to which current is supplied and a second coil mounted in a second housing. A second coil to which power is transmitted is provided. Each of the first coil and the second coil uses a T-shaped magnetic core, and a winding is formed around a protrusion of the T-shaped magnetic core. In this configuration, the protrusion of the T-shaped magnetic core of the first coil and the protrusion of the T-shaped magnetic core of the second coil are arranged to face each other.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a power supply device according to the present invention, a first coil to which a high-frequency current is supplied and a second coil to which power is transmitted from the first coil are each a T-shaped magnetic material. It is formed by arranging a winding around the protrusion of the core. The first coil is mounted in the first housing so that the protrusion of the T-shaped magnetic core of the first coil and the protrusion of the T-shaped magnetic core of the second coil face each other. And the second coil is mounted in the second housing.

[0007]

FIG. 1 shows an embodiment of a power supply unit according to the present invention.
This will be described with reference to FIGS. FIG. 1 is a sectional view showing a first embodiment of the power supply device of the present invention. In FIG. 1, L1 is a coil of the primary circuit, and L2 is a coil of the secondary circuit. The coil L1 of the primary circuit includes a T-shaped magnetic core 11, a winding 12, and a bobbin 13 made of resin.
The bobbin 13 has a hollow cylindrical portion 14 provided with two flanges to form a winding groove 15, and a terminal provided on the bottom surface. Bobbin 1
The third cylindrical portion 14 is formed such that the lower portion is larger than the upper portion with respect to the lower flange. The winding 12 is a bobbin 13
, And both ends are connected to terminals. The T-shaped magnetic core 11 is formed using a magnetic material such as ferrite, and has a T-shaped cross section with a projection provided at the center of a plate-like portion. Then, the T-shaped magnetic core 11 is inserted into the cylindrical portion 14 from the bottom surface side of the bobbin 13 with the protrusion thereof facing upward, and the plate-like portion is positioned so that the winding 12 is positioned around the protrusion. Is fixed to the back surface of the lower collar. Secondary circuit coil L2
Has a T-shaped magnetic core 16 and a winding 17. The T-shaped magnetic core 16 is formed using a magnetic material such as ferrite, and has a T-shaped cross section with a projection provided at the center of the plate-shaped portion. A winding 17 is wound around the protrusion of the T-shaped magnetic core 16. Both ends of the winding 17 are connected to terminals (not shown) provided on the T-shaped magnetic core 16.
The coil L1 of the primary circuit and the coil L2 of the secondary circuit
The coil 11 of the primary circuit is mounted in the housing of the charger such that the protrusion of the T-shaped magnetic core 11 and the protrusion of the T-shaped magnetic core 16 face each other. The coil 12 of the side circuit is mounted in the housing of the small portable device.

FIG. 2 is a sectional view showing a second embodiment of the power supply device of the present invention. In FIG. 2, L3 is a coil of the primary circuit, and L4 is a coil of the secondary circuit. The coil L3 of the primary circuit is formed by attaching a T-shaped magnetic core 21 to a resin bobbin 23 around which a winding is wound. The bobbin 23 is provided with three flanges on the cylindrical portion 24 to form a winding groove 25A,
25B, and the winding 22 is wound in the winding groove 25A.
A winding 28 used as a feedback winding for oscillation and an output winding for oscillation control is wound around B. The tubular portion 24 of the bobbin 23 is formed to have a larger portion below the middle flange so that the winding groove 25B is located outside the winding groove 25A. Then, the T-shaped magnetic core 21 is inserted into the cylindrical portion 24 of the bobbin 23 with the protrusions facing upward, and the plate-shaped portion of the T-shaped magnetic core 21 is placed on the bottom surface of the middle flange. Fixed. The coil L4 of the secondary side circuit is fitted with a winding 27 wound in a predetermined shape in advance on a protrusion of a T-shaped magnetic core 26 attached to a base having a terminal. It is formed by being connected to the terminal of the base. The coil L3 of the primary circuit and the coil L4 of the secondary circuit are arranged such that the protrusion of the T-shaped magnetic core 21 and the protrusion of the T-shaped magnetic core 26 face each other.

FIG. 3 is a sectional view showing a third embodiment of the power supply device of the present invention. The coil L5 of the primary circuit is attached to a base having a T-shaped magnetic core 31 having a terminal, and a winding 32 is wound around the protrusion of the T-shaped magnetic core 31. It is formed by connecting both ends to terminals of the base. The coil L6 of the secondary circuit is formed by fitting a winding 37 wound in a predetermined shape in advance on a protrusion of a T-shaped magnetic core 36, and connecting both ends of the winding 37 to terminals of a base. You. The coil L5 of the primary circuit and the coil L6 of the secondary circuit are arranged such that the protrusion of the T-shaped magnetic core 31 and the protrusion of the T-shaped magnetic core 36 face each other.

The output characteristics of the power supply device of the present invention are as follows:
FIG. 4 shows the output characteristics of a conventional power supply device using an I-shaped magnetic core for the coil of the primary circuit and a T-shaped magnetic core for the coil of the secondary circuit. 4, the vertical axis represents the voltage output from the coil of the secondary circuit to the load, the horizontal axis represents the current supplied to the load from the coil of the secondary circuit, 41 represents the output characteristics of the power supply device according to the present invention, 42 represents the output characteristic. Is the output characteristic of the conventional power supply device. The inductance value of the coil of the primary circuit is 3.76 mH, the inductance value of the coil of the secondary circuit is 32.2 μH, the distance between the coil of the primary circuit and the coil of the secondary circuit is 3.6 mm,
The measurement was performed by connecting a rectifier circuit and a load to the coil of the secondary circuit. In the power supply device according to the present invention, the output voltage and the load current that can be taken out from the load of the secondary circuit are larger than those of the conventional power supply device.

Although the embodiments of the power supply device of the present invention have been described above, the present invention is not limited to these embodiments. For example, T
The letter-shaped magnetic core may have a T-shaped cross section, and the shapes viewed from the top surfaces of the plate-like portion and the protrusion may be various shapes such as a polygon and a circle, respectively. Further, the T-shaped magnetic core may be formed by laminating magnetic metals.

[0012]

According to the power supply device of the present invention, the first coil and the second coil each have a winding around the protrusion of the T-shaped magnetic core. Since the protrusion of the magnetic core of the second coil and the protrusion of the T-shaped magnetic core of the second coil are arranged so as to face each other, the magnetic flux generated in the winding of the first coil is converted into a T-shape. The magnetic flux emitted from the first coil can be concentrated on the projecting side of the magnetic material core and the projecting side of the T-shaped magnetic material core of the second coil. Therefore, the power supply device of the present invention can concentrate the magnetic flux generated in the winding of the first coil in the space where the first coil and the second coil face each other. The transmission efficiency of the power transmitted to the secondary circuit can be improved by about 10% compared with the conventional one.
That is, in a portable device using the power supply device of the present invention, the required power can be obtained on the main body side even if the power applied to the primary circuit of the power supply device is reduced by about 10% as compared with the related art. Further, in the power supply device of the present invention, since the first coil and the second coil are formed using the T-shaped magnetic core, even if the shape of the second coil is reduced, the power supply device of the primary side circuit can be used. Unlike the conventional power supply device using the E-shaped magnetic core for the coil and the coil of the secondary circuit, the power transmission efficiency does not deteriorate. Therefore, the power supply device of the present invention can reduce the shape of the coil of the secondary circuit, and contribute to downsizing of the main body on which the secondary circuit is mounted.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a power supply device of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the power supply device of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the power supply device of the present invention.

FIG. 4 is a characteristic diagram showing output characteristics of the power supply device of the present invention and a conventional power supply device.

FIG. 5 is a cross-sectional view illustrating an example of a conventional non-contact power supply device.

FIG. 6 is a sectional view showing another example of a conventional non-contact type power supply device.

FIG. 7 is a cross-sectional view illustrating still another example of a conventional non-contact power supply device.

[Explanation of symbols]

 L1 Coil of primary circuit L2 Coil of secondary circuit 11, 16 T-shaped magnetic core 12, 17 winding 13 bobbin

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichi Kudo 18-storey Gomigaya, Tsurugashima-shi, Saitama Toko, Saitama Works Town No. 1 Inside Nihon Battery Co., Ltd.

Claims (1)

[Claims] A first coil mounted in a first housing and supplied with electric current; and a first coil mounted in a second housing and connected to the first coil.
A power supply device comprising a second coil to which power is transmitted from the first coil and the second coil, wherein the first coil and the second coil each use a T-shaped magnetic core, A structure is provided in which a winding is provided around the protrusion of the core, and the protrusion of the T-shaped magnetic core of the first coil and the protrusion of the T-shaped magnetic core of the second coil are mutually separated. A power supply device which is arranged to face each other.