JPH0556569A - Power supply for portable electronic device - Google Patents

Abstract

PURPOSE:To provide a power supply for a portable electronic device such as a portable phone which makes the electronic device usable certainly at the time of emergency by controlling a secondary battery to be incorporated in the portable electronic device. CONSTITUTION:In a casing 12 of a portable phone 11, a battery to be charged by a generating mechanism 20 is incorporated. The phone operates from this battery power. A rotary handle 13 protruding on the side is installed on the casing 12. A coil 202 of the generating mechanism 20 is rotated to cut a magnetic field formed by permanent magnets 201 for power to be generated. Current generated in this coil 202 is supplied as charge power to a battery through a rectify mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for a portable electronic device used in a portable electronic device such as a portable telephone.

[0002]

2. Description of the Related Art In a portable electronic device, it has been proposed to incorporate a power generation function into the main body of the electronic device.
For example, a solar cell is attached to a calculator or an electronic timepiece, and the function is exhibited by the electric power generated by the solar cell. When such a solar cell is used as a direct power source, the electronic device functions only when light is incident on the solar cell, and cannot be used in other cases.

In such an electronic device, it has been considered to use a rechargeable secondary battery. When such a secondary battery is used, when the charge capacity is reduced, the external power source is used to replenish (charge) the battery set in the electronic device. Must be connected to an external power source.

Generally, the capacity decrease due to the use of the secondary battery occurs when it is difficult to obtain a power source for charging. For example, in the case of a mobile phone, it occurs in a remote place where there is no charging power supply facility, and it is practically impossible to charge the battery, and the phone cannot be used especially in an emergency. In order to avoid such a situation, the state of charge of the secondary battery must always be ensured, and its handling is complicated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points. For example, when a secondary battery is installed as a power source in a mobile phone, the battery capacity is reduced. It is an object of the present invention to provide a power supply device for a portable electronic device which can be charged immediately and can cope with the use of the telephone.

[0006]

In a power supply device for a portable electronic device according to the present invention, a rechargeable battery is installed in a casing accommodating an electronic device, and a power generation device is provided in the casing. The generated electric power from the battery is supplied to the battery for charging through a charging current control circuit also installed in the casing.

[0007]

In the power supply device of the portable electronic device having such a structure, for example, when the capacity of the battery housed in the casing decreases and the electronic device becomes unusable,
When the power generation means installed in this casing is made to function, the battery is immediately charged and this electronic device can function. For example, when the electronic device operates the power generation function provided in the mobile phone, the function of the battery is restored and the call is enabled.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a portable telephone 11 as a portable electronic device.
The following is an example of the case where
It has the same functions as a normal mobile phone.
Then, a handle 13 which constitutes the power generation mechanism and which performs a rotating operation is provided on the side surface of the casing 12, and the power generation mechanism is built in a portion A corresponding to the handle 13. In addition, although not shown directly, for example, a rechargeable battery corresponding to the portion B is built in, and a charging current control circuit for supplying the charging power from the power generation unit to this battery is built in the portion C. To be done.

FIG. 1 (C) shows the structure of the power generation mechanism 20 built in the portion A. The permanent magnet 201 for generating a magnetic field and the magnetic field generated by the permanent magnet 201 are cut off. A coil 202, which is a conductor section set as described above, is rotated coaxially by rotating the handle 13, and the coil 202 crosses the magnetic field of the magnet 201 so that electric power is induced. ing.

That is, the coil 202 is integrally attached to the shaft rotated by the handle 13, and the electric power generated in the coil 202 is collected by the brush 203 and conducted to the charging current control circuit. I will be able to be. The brush 203 also serves as a rectifying mechanism that aligns the AC component generated in the coil 202 into a unidirectional component.

FIG. 2 shows the structure of the charging circuit. In this figure, an example in which a semiconductor rectifying device 25 is used to convert the generated alternating current into direct current power is shown. That is, the AC power generated in the coil portion of the power generation mechanism 20 is supplied as charging power to the rechargeable secondary battery 26 via the rectifying element 25, and the voltage of the power applied to this battery 26 is It is arranged to be limited by the constant voltage element 27. In this figure, 28 is a load, specifically a telephone circuit. 29 is an on / off switch for the telephone circuit.

In the portable telephone 11 configured as described above, when the stored energy of the secondary battery 26, which is the driving power source, decreases, the coil 102 cuts the magnetic field generated by the magnet 201 by rotating the handle 13. Therefore, an alternating current is generated in the coil 202 due to the electromagnetic induction phenomenon. The generated alternating current is rectified into a one-way component by the rectifying element 25 and transmitted to the secondary battery 26 via the charge / discharge circuit to charge the battery 26.

In the power generation mechanism 20 shown in FIG. 1, since the coil 202 portion is rotated, the generated current is collected via the brush portion that is in contact with the rotating coil 202. If such a mechanical contact portion is present in the energized portion, the conductive state may be deteriorated due to oxidation, wear, inclusion of foreign matter, or the like. Therefore, in practical use, it is desirable to have a structure without such a mechanical contact portion.

FIG. 3 shows an embodiment of the power generation mechanism 20 in consideration of such points. The coil 205 is fixedly set, and is located on the side of the axis line corresponding to the rotary shaft 131 of the handle 13. Located and set. A rotary container 206 is integrally attached to the rotary shaft 131 of the handle 13, and the container 206 is rotated by the operation of the handle 13. Then, the permanent magnet 207 is housed and fixed in the container 206.

The magnet 207 surrounds an axis line corresponding to the rotating shaft 131, and N and S magnetic poles are alternately arranged around the axis line, and the N and S poles are opposed to each other along the axis line. Are set to face each other.
Then, when the permanent magnet 207 is rotated together with the container 206 by the operation of the handle 13, the magnetic field set by the magnet 207 is rotated so as to traverse the coil 205. Therefore, in the power generation mechanism 20 having such a configuration, the generated power can be output without using any mechanical contact mechanism.

In the embodiment described so far, the battery
When the battery 26 is exhausted, the handle 13 is consciously turned to charge the battery 26. However, for example, a rotating pendulum may be used to generate generated power by vibration during carrying and automatically control charging of the secondary battery. It is also possible to reduce the frequency of use of the rotary power generation mechanism 20 by combining it with a solar cell, a thermoelectric generator, or the like.

[0017]

As described above, according to the power supply device of the portable electronic device according to the present invention, the rechargeable battery is used as the power supply, and the charge control can be arbitrarily performed when the device is carried. The handling of electronic equipment using a battery as a power source becomes very convenient, and the management of the charge state of a particularly complicated battery power source is simplified.

[Brief description of drawings]

1A and 1B show a portable telephone, which is a portable electronic device according to an embodiment of the invention, in which FIG. 1A is a side view and FIG.
Is a front view, and (C) is a diagram illustrating a built-in power generation mechanism.

FIG. 2 is a diagram showing a power supply circuit of such an electronic device.

FIG. 3 is a diagram illustrating a configuration of a power generation mechanism according to another embodiment of the present invention.

[Explanation of symbols]

11 ... mobile phone, 12 ... casing, 13 ... handle, 20 ...
Power generation mechanism, 201, 207 ... Permanent magnet, 202, 205 ... Coil, 203 ... Brush, 25 ... Rectifying element, 26 ... Rechargeable battery.

Claims (1)

[Claims] 1. A rechargeable battery set in a casing accommodating an electronic device, a power generation unit attached to the casing, and a current generated in the power generation unit set in the casing. A power supply device for a portable electronic device, comprising: a charging current control circuit supplied to a battery for charging.