JPH1032934A - Battery charger for secondary battery of portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a battery charger to easily charge the secondary battery of a portable telephone set at any time and place by providing a battery power source connecting section, a DC voltage transforming means which adjusts the voltage of a battery power source to the voltage of the secondary battery to be charged, and an output terminal section which impresses an output voltage in conformity with the position of the terminal of the battery. SOLUTION: A battery charger 10 comprises a battery power source connecting section 1, a DC voltage transforming means 2, and an output terminal section 3 for a battery B to be charged. The connecting section 1 comprises a terminal meeting the standard of a dry cell or a connecting section to the another battery power source. The transforming means 2 adjusts the voltage of a battery power source which is, for example, an integer times as high as the voltage (1.5V) of a dry cell or equal to the voltage (12V) of the battery for automobile to the voltage of the battery B. The output terminal section 3 is provided with a mechanism meeting the terminal dimension, interval, etc., of the battery B which varies depending upon the kind of the battery B. Therefore, the secondary battery of a portable telephone set can be charged easily by utilizing an external battery power source, such as the dry cell, battery for vehicle, etc.

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 a secondary battery for a mobile phone, which is capable of charging various secondary batteries for a mobile phone without limiting the place of use.

In recent years, portable telephones, PHSs and the like (hereinafter simply referred to as portable telephones) have become widespread, and secondary batteries as power sources play an extremely important role. As is well known, batteries include primary batteries that can be discharged only once,
There are secondary batteries that can be charged and discharged many times.

A primary battery widely used as a manganese battery or an alkaline manganese battery is standardized internationally and has an advantage that it can be used easily, but is a complete consumable.

[0004] Lead-acid batteries which have been used for a long time as secondary batteries which can be charged and discharged many times have been variously improved over a long history, and the dimensions and capacities have been remarkably advanced. However, this lead storage battery is not suitable as a power source for small mobile devices, for example, portable devices, because of its heavy weight and the use of a dilute sulfuric acid solution as an electrolyte.

[0005] A small sealed lead-acid battery in which such a well-known lead-acid battery is formed in a small size is also partially adopted, but the battery capacity per unit to weight is small. At present, nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (NiMH) batteries, lithium ion (Li) batteries, and the like are widely used as small secondary batteries used in various portable devices.

[0006]

2. Description of the Related Art Secondary batteries for portable telephones have been used in large quantities with the remarkable spread of portable telephones at present, but the shapes and dimensions differ depending on the model, and the terminal voltage thereof is 3.6 to 9.
There are various types of 6V. Therefore, charging of the secondary battery requires a charging device that has a connection terminal shape adapted to each type and generates a voltage higher than the terminal voltage. For this reason, a normal charging device charges the battery with a DC voltage obtained by rectifying the voltage of the commercial power supply to an appropriate voltage.

[0007] Compared with many portable devices such as a handy terminal, a notebook personal computer, and an electronic organizer, the only difference between portable telephones is that the former can select the time of use based on the user's own intention. On the other hand, in addition to the use by the user's own intention, that is, the outgoing call, the use added from outside without the user's own intention, that is, the function of receiving the telephone is included. Telephone calls from other parties are often unpredictable and require a constant standby (standby) regardless of time and location.

[0008] In addition, it is significant to always carry a mobile phone, and there is a drawback that the charging time cannot be secured freely because the user carries the mobile phone even when he goes out for a long time, travels, or travels. From such characteristics of the mobile phone, the usable time of the secondary battery has a very important meaning. Therefore, it is necessary that the time during which the secondary battery becomes unusable due to charging or replacement is as short as possible.

In order to meet such a demand, a plurality of batteries are prepared, and when the charge capacity becomes insufficient, the battery is replaced with a spare battery, and the consumed battery is charged during that time. However, conventional charging devices require commercial power,
It is useless when going out or traveling when commercial power is not freely available.

Further, in the conventional charging method, it is not easy to end the charging operation in an adequately charged state, and it is often necessary to start using the battery in an insufficiently charged state. This is because the state of charge of the small secondary battery cannot be confirmed from the outside at present, and it is not easy to determine a necessary and sufficient charge end time.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for charging a secondary battery for a mobile phone which can easily charge the secondary battery for a mobile phone regardless of time and place. And

[0012]

As shown in FIG. 1, a charging device for a secondary battery for a mobile phone according to the present invention is connected to a battery power supply having a voltage different from the terminal voltage of the battery to be charged for the mobile phone. Unit 1, a DC voltage converting means 2 for adjusting the voltage of the battery power supply to the voltage of the battery to be charged, and an output voltage of the DC voltage converting means 2 to be applied in accordance with the terminal position of the battery B to be charged. And an output terminal unit 3 of the first embodiment.

As the battery power source in the charging device according to the present invention, a widely available standard type dry battery can be used. Such batteries are sold in electronics stores, department stores, supermarkets, photo shops, general stores, convenience stores, station stores,
It is easily available at amusement parks, souvenir shops, etc. Also,
There are many vending machines for dry batteries, and they can be purchased without any time limit.

When such a dry battery is used, the DC voltage converting means 2 considers the use of, for example, about two dry batteries and sets the voltage of 3 volts to the voltage of the secondary battery for a cellular phone, for example, 3.6 to 9. It boosts the voltage to 6 V, and can be configured with a booster circuit incorporating a switching element.

Since a large number of rechargeable batteries having the same standard shape as the single to AA dry batteries are commercially available, such rechargeable battery power supplies can be used.

Further, a battery power source for charging is 12
V and 24V car batteries can be used. By providing a step-down circuit as the DC voltage converting means 2, a more advantageous charging device can be obtained. In this case, for example, the purpose can be achieved by adding a connection cord having a connection plug to the cigar lighter insertion portion.

Further, a battery power source for charging is 10
0V commercial power supply can be used. In this case, a step-down circuit and a commercial power supply rectifier circuit are provided as the DC voltage converting means 2. Thereby, a more advantageous charging device can be obtained.

In the output terminal section 3 according to the present invention, the positive and negative terminals are attached to an integral housing cover, and the terminal position changing means for changing the position of each terminal in accordance with the battery to be charged includes positive and negative terminals. One or both terminals are configured to be slidable, and the output terminal is formed by an elastic metal so as to be vertically movable.

Instead of attaching the positive and negative terminals to the integral housing cover, the positive and negative terminals can be separated into positive and negative electrodes via lead wires and formed separately. With such a configuration, the terminal position changing means and the polarity switching operation according to the type of the battery to be charged are not required.

The terminal position changing means makes it possible to adjust the distance between the positive and negative terminals, the terminal height from the housing surface, and the like, and can cope with various secondary batteries having different shapes and dimensions. The means for changing the interval between the positive and negative terminals can be achieved, for example, by allowing at least one terminal to slide along a line connecting the both. Further, fine adjustment of the terminal height can be dealt with by incorporating an elastic body in the terminal mounting portion or by forming the terminal with the elastic metal itself.

Further, in the charging apparatus for a secondary battery for a portable telephone according to the present invention, the pressure contact means 14 for reducing the contact resistance when the output terminal is brought into contact with the terminal of the battery to be charged.
It is characterized by having. This press-contact means 14 is applicable not only when the positive and negative terminals are attached to the integral cover, but also when the positive and negative terminals are used individually.

As the pressing means 14, an attractive force of a permanent magnet can be used. Further, the contraction force of an elastic band with a fastener or a spring can be used.

Further, according to the present invention, a DC jack 33 is provided in parallel with the output terminal 3, and the DC jack 33 is connected to a portable telephone equipped with a secondary battery via the DC jack 33 to supply operating power. It is characterized in that the secondary battery is charged at the time of load.

According to the secondary battery charging apparatus of the present invention having such a structure, the secondary battery for a mobile phone can be charged by a readily available battery power source, and it is possible to travel, go on a business trip, or go out. In such a case, it is possible to avoid a situation in which communication is disabled due to battery exhaustion.

Further, by adding a 12V circuit or a 24V circuit, even when it is difficult to obtain a dry battery, it is possible to perform a charging process using a vehicle battery.

With the use of the secondary battery charging device according to the present invention, it is possible to eliminate the inability to talk due to the exhaustion of the battery and to almost eliminate the situation in which important communication becomes unavailable.

[0027]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 2 is a block diagram showing an embodiment circuit of the secondary battery charger 10 for a mobile phone according to the present invention. 2, the same components as those in FIG. 1 are denoted by the same reference numerals.

The charging device 10 includes a connection portion 1 for a battery power supply O,
It comprises a DC voltage converting means 2 and an output terminal 3 for the battery B to be charged. The connection part 1 of the battery power supply O can be a terminal conforming to the standard of the dry battery or a connection part for other battery power supply.

The DC voltage converting means 2 comprises a step-down / step-up element 2
1, switching element 22, step-down / step-up control circuit 23,
A reverse connection protection element 24 and a reverse connection protection control circuit 25 are provided, and the voltage of the battery power supply O, for example, a voltage that is an integral multiple of 1.5 V of a dry cell or the voltage of an automobile battery, for example, 12 V, is supplied to the battery B to be charged. Function to adapt to the voltage.

Note that the reverse connection protection element 24 and the reverse connection protection control circuit 25 may supply a reverse current when the terminals of the battery B to be charged are reversely connected due to an error since the terminal position may be reversed depending on the model. To prevent the circuit and the battery to be charged from being adversely affected.

In this case, it is possible to perform a circuit interruption control by the reverse connection protection control circuit 25, and at the same time, generate an alarm by a visible output and / or an audible output, thereby requesting a user to perform a switching operation. Going further,
A polarity switching relay (not shown) may be operated by an output of the reverse connection protection control circuit 25 to perform automatic switching.

Output terminal 3 to be brought into contact with battery B to be charged
It is desirable to provide a mechanism for adjusting the terminal dimensions, intervals, etc. of various types of batteries to be charged. This switching mode can be adapted without error by providing a terminal sliding mechanism and stopping at a click position according to the battery type. Further, both the positive and negative terminals can be formed so as to be individually connectable via a lead wire. According to these configurations, it is possible to easily adapt to a plurality of charged batteries of different types.

As another mode, an attachment for each battery type is prepared and exchanged. A large number of screw holes for fixing the terminals are formed and selectively fixed to any of them with a simple tool. Thereby, a method or the like adapted to the terminal position of the battery can be arbitrarily adopted.

According to any of the above methods, the charger main body is formed as a general-purpose type, and can be adapted to the battery type of the device owned by the user according to the selection of the user. In the case where the battery type is changed due to the change, the terminal can be adjusted and the charging device can be continuously used.

FIG. 3 is a perspective view showing a preferred embodiment of the rechargeable battery for a mobile phone according to the present invention. As shown in the figure, the present charging device includes a battery housing unit including a battery power supply connection unit 1 and a charging device main body 11 including a circuit element (not shown) as a DC voltage converting unit, and a terminal position changing unit. And a battery housing cover 12 having an output terminal 3 attached thereto.

A polarity changeover switch 13 is added to the charging device main body 11. In this case, in the embodiment in which the positive and negative connection terminals are individually formed, the polarity changeover switch can be omitted. During the charging operation, the charging device main body 11 and the cover 12 are connected by a connection cord (not shown) or the like.

FIG. 4 shows an example of the configuration of the back surface of the battery housing cover 12, which is provided with a pair of positive and negative output terminals 3 for charging and means for pressing the terminals to the battery to be charged. A permanent magnet 14 is provided. If the case of the battery to be charged is a magnetic material as it is, or if it is a non-magnetic material, by attaching a magnetic thin plate in advance to a corresponding portion of the battery to be charged with a double-sided tape or an appropriate adhesive, The contact pressure between the charging output terminal 3 and the terminal of the battery to be charged can be ensured by the attractive force of the permanent magnet 14.

FIGS. 5 and 6 are side sectional views showing a state where the charging terminal 3 of the battery housing cover 12 in FIG. 4 is pressed against the terminal of the battery B to be charged. FIG. 5 shows a pressure-contact state when the terminals of the battery B to be charged are substantially flat with the surface of the battery main body, and FIG. 6 shows a state in which the terminals of the battery B to be charged protrude from the battery main body. It shows the pressure contact state.

Even when the terminal of the battery B to be charged is attached in the manner shown in FIG. 6 or when the terminal portion is fitted, the contact between the charging terminal 3 and the battery terminal of the battery B to be charged is maintained. In order to keep good, it is convenient that the contact portion of the charging terminal 3 is formed of an elastic metal or has a built-in elastic member in the mounting portion.

FIG. 7 is a plan view showing a state of use in a case where both the positive and negative terminals are attached to the integral cover 12 in the embodiment of FIG. 3, and the output terminal 3 having a sliding mechanism as terminal position changing means. Are attached to the cover 12 of the battery storage unit. In the charging process, the cover 12 is detached from the charging device main body 11, connected to the charging device main body 11 by the cord 15, and the voltage adjusted to the terminal voltage of the battery B to be charged is applied to the battery terminals to perform charging.

The distance between the charging terminals 3 can be relatively adjusted as indicated by the double-headed arrow of the solid line and / or the broken line.
Therefore, it is possible to easily cope with charging of a plurality of types of secondary batteries having different model dimensions.

The permanent magnet 14 shown in FIGS.
In place of the means for pressing the output terminal 3 to the battery terminal of the battery B to be charged, a holding force of an elastic band or a crimp-type fastener can be used.

FIG. 8 shows output terminals for the battery to be charged.
FIG. 9 shows a use state of an embodiment formed separately for each of positive and negative via a lead wire. Each of the positive and negative contact terminals 31 is made of an elastic metal and is attached to the tip of a contact unit 32 including a permanent magnet and the like.

The contact unit 3 on the back side of the pressing means 14
On the surface of No. 2, considering convenience in connection,
Is desirably added. A lead wire connected to the output terminal of the charging device main body is connected to the rear end of the contact unit 32.

FIG. 9 is a partially broken side view showing the structure of the positive and negative output terminals. The contact terminals 31 made of an elastic metal and the lead wires are connected in a contact unit 32 which is a so-called insert-molded product which is inserted into a resin and molded. Further, a permanent magnet 14 is provided on the lower surface as a press-contact means in the same manner as in the previous embodiment, so that it can be attracted to the housing.

FIGS. 10 (A) and 10 (B) are explanatory views showing that the structure can be dealt with by bending of the contact terminal 31 made of an elastic metal regardless of the structure around the terminal of the battery to be charged. is there. The contact between the contact terminal 31 and the battery terminal of the battery B to be charged can be performed even when the terminal of the battery B to be charged is attached in a manner as shown in FIGS. Can be kept good. For this reason, it is convenient for the contact terminal 31 to be formed of an elastic metal or to have an elastic body built in the mounting portion.

Table 1 shows the measurement results of the charging state when two AA alkaline batteries are used in the circuit configuration shown in FIG. 2 of the secondary battery charger according to the present invention. In addition, the example of the battery type of a to-be-charged battery in a table | surface and a compatible mobile telephone is as follows.

Battery to be charged 1: 3.6 V, 600 mAh
(Applicable phone example: NTT DoCoMo Mover P101
(800MHz digital) Battery to be charged 2: 4.8V, 550mAh (Example of applicable phone:
NTT DoCoMo Mover N II (800MHz digital)
Battery to be charged 3: 6 V, 550 mAh (applicable phone example: NT
T DoCoMo Mover TZ820 (1.5GHz digital))

[0049]

[Table 1]

In each of the above-described embodiments, a description has been given of a state in which a standard type of dry battery, for example, a dry cell of AA, AA, AA, etc. is used. I can't escape. A vehicle-mounted battery can be used as the easiest battery power source even when moving.

This case can be easily coped with by providing a 12V or 24V step-down circuit in addition to the step-down / step-up element 21 for the dry battery shown in FIG. Connected to the step-down element 21 provided in this manner by, for example, a cord with a cigar lighter plug,
When activated, the charging process can be performed.

The control of the voltages of the different battery power sources to a desired charged battery voltage is performed by switching the step-down / step-up control circuit 23 in the block diagram of FIG. 2 by switches (not shown). can do.

FIG. 11 is a block diagram showing the configuration of another embodiment of the charging device for a secondary battery for a portable telephone according to the present invention. In this embodiment, a DC jack 33 is provided in the output terminal portion 3 in addition to a connection terminal for the battery B to be charged.

The DC jack 33 is capable of applying a DC voltage corresponding to a battery voltage to a portable telephone equipped with a secondary battery. The mobile phone is provided with a jack connected in parallel with both poles of the secondary battery, and the jack and the DC jack 33 of the charging device 10 are connected to the charging device 10 by inserting plugs at both ends of a connection cord. It connects to a mobile phone.

In the charging apparatus according to this embodiment, even when the battery mounted on the mobile phone is considerably depleted, by connecting the charging apparatus 10 to the mobile phone, a dry battery, a vehicle battery, etc. By using the external battery power source, the original function of the mobile phone can be exhibited.

Therefore, it is possible to talk even when the secondary battery for the mobile phone is exhausted, and in a low power consumption state such as a standby state, the battery to be charged is not charged. Will be

Further, in the present invention, it is possible to adopt a configuration that enables charging with a commercial power supply by adding a well-known rectifier circuit.

[0058]

According to the charging device for a secondary battery for a mobile phone according to the present invention, the secondary battery for a mobile phone can be charged by a readily available battery power source. Therefore, it is possible to avoid a situation in which a call cannot be made due to running out of a battery when traveling, traveling, going out, or the like. Further, by adding a 12V circuit or a 24V circuit, even when it is difficult to obtain a dry battery, it is possible to perform a charging process using a vehicle battery. In this case, since the terminal structure of the battery to be charged can be easily coped with, even if the battery shape, the rated voltage, the polarity, and the like are different, it can be easily coped with.

By using the secondary battery charging device according to the present invention, it is possible to avoid a situation in which communication is impossible due to running out of the battery and almost eliminate a situation in which important communication is not possible, thereby further improving the usability of the portable telephone.

Further, according to the configuration in which the DC jack is provided, it is possible to supply operating power to the portable telephone having the battery to be charged, and to perform the charging operation under a light load state.

Therefore, even when the original battery is exhausted, the useless state of the mobile phone can be almost completely eliminated by using an external battery such as a dry battery, and the battery can be charged during the unused state. And the usability of the mobile phone can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a charging device for a secondary battery for a mobile phone according to the present invention.

FIG. 2 is a block diagram showing a specific configuration example of a charging device for a secondary battery for a mobile phone according to the present invention.

FIG. 3 is a perspective view showing the overall configuration of a charging device for a secondary battery for a mobile phone according to the present invention.

4 is a perspective view showing a configuration of a cover shown in FIG. 3 of the secondary battery for a mobile phone according to the present invention.

FIG. 5 is a side sectional view showing an example of a charging terminal pressure contact state in the embodiment of the charging device for a secondary battery for a mobile phone according to the present invention.

FIG. 6 is a side sectional view showing another example of a charging terminal pressure-contact state in the embodiment of the charging device for a secondary battery for a mobile phone according to the present invention.

FIG. 7 is a connection configuration diagram showing a connection state in the embodiment of the charging device for a secondary battery for a mobile phone according to the present invention.

FIG. 8 is a perspective view showing another embodiment in which the output terminals of the charging device for a secondary battery for a mobile phone according to the present invention are formed separately for positive and negative.

FIG. 9 is a partially broken side view showing the structure of the terminal portion in the embodiment shown in FIG.

FIG. 10 is a side view showing a contact state of a contact terminal portion in the embodiment shown in FIGS. 8 and 9;

FIG. 11 is a block diagram showing the configuration of another embodiment of the charging device for a secondary battery for a mobile phone according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery power connection part 2 DC voltage conversion part (DC voltage conversion means) 3 Output terminal part (charging terminal) 10 Charging device 11 Charging device main body 12 Cover 13 Polarity change switch 14 Permanent magnet 15 Code 21 Step-down / boost element 22 Switching element 23 Step-down / step-up control circuit 24 Reverse connection protection element 25 Reverse connection protection control circuit 31 Contact terminal 32 Contact unit 33 DC jack O Battery power supply B Battery to be charged

Claims (8)

[Claims] 1. A connection part of a battery power supply having a voltage different from a terminal voltage of a battery to be charged for a mobile phone; DC voltage converting means for adjusting the voltage of the battery power to the voltage of the battery to be charged; An output terminal unit for applying an output voltage of the DC voltage converting means in accordance with a terminal position of the battery to be charged, and a charging device for a secondary battery for a mobile phone. 2. The charging device for a secondary battery for a mobile phone according to claim 1, wherein the battery power supply connection portion is a dry battery connection portion. 3. The charging device for a secondary battery for a mobile phone according to claim 1, wherein the battery power connection is an output connection of an automobile battery. 4. The charging device for a secondary battery for a mobile phone according to claim 1, wherein the battery power supply connection portion is an output connection portion of a commercial power supply rectifier circuit. 5. The output terminal section has positive and negative electrodes mounted on a unitary housing, and a terminal position changing means for adjusting the terminal position of the battery to be charged is provided so that either the positive or negative terminal can slide. The output terminal is formed so as to be vertically movable by an elastic metal.
The charging device for a secondary battery for a mobile phone according to any one of claims 1 to 4. 6. The battery according to claim 1, wherein the output terminal portion is separated into positive and negative electrodes via a lead wire, and is formed so as to be individually connectable to a terminal position of the battery to be charged. A charging device for a secondary battery for a mobile phone according to any one of the above. 7. The secondary battery for a mobile phone according to claim 1, further comprising press-contact means for bringing the output terminal into close contact with the terminal of the battery to be charged. Charging device. 8. A DC jack is provided in parallel with the output terminal. The DC jack is connected to a portable telephone equipped with a secondary battery to supply operating power, and the secondary battery is charged at light load. The charging device for a secondary battery for a mobile phone according to any one of claims 1 to 4, wherein: