JP2001086652A - Noncontact charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thin a charging part without damaging the function of the high-frequency oscillating circuit of the charging part especially, by arranging each electronic component which constitutes the high-frequency oscillating circuit, on the same board surface with a charging coil. SOLUTION: Each electronic component is arranged on the same board surface of a circuit board 21, and an oscillating coil 23 is arranged so as to adjoin the peripheral part of a charging coil to obtain sufficient coupling with the charging coil 22. Other electronic components which form a high-frequency oscillating circuit excluding the oscillating coil 23 is arranged and mounted inside the charging coil 22. Consequently, a charging part comes to have a thickness in the extent of the sum of the thickness of the circuit board 21 and the height of the charging coil 22 in the aggregate, and the thickness is reduced approximately to a half of that of a conventional one. Besides, further thinning becomes feasible by using a surface mounting component for each electronic component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device for contactlessly charging a secondary battery built in a cordless device such as a portable telephone by electromagnetic induction.

[0002]

2. Description of the Related Art A conventional example will be described below with reference to the drawings.
FIG. 2 is a configuration diagram of a conventionally known contactless charging device. FIG. 3 is a circuit diagram of the charger 20 (charging unit) and the cordless phone handset 10 (charged unit) shown in FIG. First, a circuit diagram will be described. General household power supply (AC100
V) through a DC power supply circuit (rectifying / smoothing circuit) from the outlet connected to
1, supplied to A2. When the voltage is supplied, the charging unit 20
The high-frequency oscillation circuit 24 operates, the charging coil 22 is driven, power is transmitted to the power receiving coil 11 of the charged portion 10 in a non-contact manner, and the secondary battery B is charged. The high-frequency oscillation circuit 24 has a startup resistor R1, a capacitor C3, and an oscillation coil 22 connected in series between terminals A1 and A2 to which DC power is supplied, and a charging coil 22 between the startup resistors R1.
And the oscillation capacitor C1 are connected in series. The base resistor R2 and the base of the transistor Q1 are connected in series from the connection point between the starting resistor R1 and the capacitor C3. The emitter of the transistor Q1 has a resistor R3 for grounding the emitter.
And the capacitor C2 are connected in series and connected to the terminal A2. The collector of the transistor Q1 is connected to a point where the charging coil 22 and the oscillation capacitor C1 are connected.
This is a Hartley oscillation circuit having such a circuit configuration.

On the other hand, the charged part 10 includes a power receiving coil 11 for electromagnetically coupling with the charging coil 22 to induce a voltage, and a capacitor C4 connected in parallel to the power receiving coil 11 and forming a parallel resonance. , Diode D for rectification
1, a smoothing capacitor C5, and a secondary battery B for charging.

Next, a configuration diagram of the contactless charging device shown in FIG. 2 will be described. 10 is a configuration diagram of a charged portion of the contactless charging device, and 20 is a configuration diagram of a charging portion of the contactless charging device. The charging unit 20 and the charged unit 10 are detachably separated from each other, and the charging unit 20 includes a charging coil 22 and a high-frequency oscillation circuit 24 for driving the charging coil 22.
A power receiving coil 11 for inductively coupling the charging coil 22 to the charged portion 10 to induce a voltage, a secondary battery for charging the voltage induced in the power receiving coil 11, and the like.
(Not shown), from the charging unit 20 to the charged unit 10
This is a non-contact charging device that transmits electric power by electromagnetic induction without contact through metal contacts. Symbol 12
Is a case to be charged and 25 is a charger case.

[0005] As described above, in the configuration of the charging section of the non-contact type charging device for transmitting power, a Hartley oscillation circuit that has a small number of components and can be manufactured at low cost has been put into practical use as a high frequency oscillation circuit. The configuration of the charging unit using the Hartley oscillation circuit includes a circuit board 21 on which the high-frequency oscillation circuit 24 is mounted as shown in FIG. 2 and a charging coil fixed to the surface opposite to the component mounting surface. Electronic components that constitute a coil and other high-frequency oscillation circuits are mounted on different substrates (not shown) and have been put to practical use.

[0006]

SUMMARY OF THE INVENTION In the non-contact charging device having the above-described structure, it is particularly required to make the charging section thinner. An object of the present invention is to reduce the thickness of a non-contact charging device without impairing the function of a high-frequency oscillation circuit in a charging section, in particular.

[0007]

According to the present invention, there is provided a non-contact type charging apparatus in which a charging section and a charged section are detachable and detachable. The charging section includes a charging coil and a driving coil for driving the charging coil. A non-contact type that includes a high-frequency oscillation circuit, the receiving unit includes a power receiving coil for electromagnetically coupling with the charging coil to induce a voltage, and allows the non-contact charging of the secondary battery of the charging unit from the charging unit. In the battery charger, each electronic component constituting the high-frequency oscillation circuit is arranged on the same substrate surface as the charging coil.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A non-contact charging device according to the present invention comprises a high-frequency oscillation circuit composed of a charging coil using an air-core coil, and a charging coil constituting the high-frequency oscillation circuit and each electronic component are mounted on the same substrate surface. It is an object of the present invention to reduce the thickness without disposing the high-frequency oscillation circuit in the charging section without impairing the function of the high-frequency oscillation circuit.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A non-contact charging device according to the present invention will be described with reference to the drawings. FIG. 1 is a top view and a front view of an embodiment of the non-contact charging device of the present invention. The circuits used are the same as those in FIG. 3, and the same reference numerals as in FIGS. 2 and 3 are used.
In the figure, 21 is a circuit board, 22 is a charging coil using an air-core coil, 23 is an oscillation coil, Q1, C1, C2,
C3, RI and R2 are other electronic components forming a high-frequency oscillation circuit. The charging coil 22 has an inner diameter area of the oscillation coil 2.
It is desirable that each of the electronic components forming the high-frequency oscillation circuit other than the above-mentioned component 3 has an area capable of including and mounting electronic components, and has a height higher than each electronic component. The oscillating coil 23 uses a drum-shaped core, and the winding portion uses an insulating tape or the like that has been subjected to insulation treatment. It is desirable in doing.

The electronic components are arranged on the same substrate surface of the circuit board 21, and the oscillation coil 23 is arranged adjacent to the outer periphery of the winding of the charging coil so as to obtain sufficient coupling with the charging coil 22. Other electronic components forming the high-frequency oscillation circuit except the oscillation coil 23 are arranged and mounted inside the charging coil 22.

By arranging and mounting on the same surface of the circuit board as described above, the thickness of the charged portion as a whole is
And the thickness of the charging coil 22 is approximately equal to the height of the charging coil 22, and can be reduced to almost half the thickness of the conventional product. Furthermore, in this embodiment, discrete components are used for each electronic component of the high-frequency oscillation circuit. However, by using surface mount components, it is possible to further reduce the thickness.

[0012]

As described above, according to the non-contact charging device of the present invention, the electronic components forming the high-frequency oscillation circuit are arranged and mounted on the same substrate surface, and the air-core coil is used as the charging coil. This is effective in reducing the thickness and size of the non-contact charging device.

[Brief description of the drawings]

FIG. 1 is a top view and a front view of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a non-contact charging device according to an embodiment.

FIG. 3 is a circuit diagram of a contactless charging device according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Circuit board 22 Charging coil using air core coil 23 Oscillation coil

Claims (2)

[Claims] The charging section and the section to be charged are detachably configured. The charging section includes a charging coil and a high-frequency oscillation circuit for driving the charging coil. A non-contact charging device including a power receiving coil for electromagnetically coupling with the coil to induce a voltage, and capable of charging the secondary battery of the charged portion in a non-contact manner from the charging unit; A non-contact charging device, wherein the components are arranged on the same substrate surface as the charging coil. 2. The non-contact charging device according to claim 1, wherein an air core coil is used as the charging coil.