JP3280356B2 - Mobile phone charger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charger for a mobile phone, and more particularly to a charger for a mobile phone that uses a dry cell as a power source to charge a battery of the mobile phone.

[0002]

2. Description of the Related Art Conventionally, there is a dry cell type battery charger which charges a battery of a portable telephone using a dry cell as a power source. A conventional dry-cell battery charger is, for example, connected in series with three or four AAA alkaline batteries to form a power supply of a voltage of 4.5 V or 6 V, and this power supply is directly connected to a battery of a mobile phone.
The battery of the mobile phone is charged at a charging voltage of 4.5V or 6V.

[0003]

The conventional dry cell type battery charger performs charging by applying a charging voltage of 4.5 V or 6 V to the battery of the mobile phone regardless of the state of charge of the battery of the mobile phone. The battery is charged even after the battery is fully charged, and there is a risk that the battery may be overcharged, thereby damaging the battery of the mobile phone.

A conventional dry-cell battery charger is used when the battery of a mobile phone runs out of power, for example, when it is away from home. Therefore, it should be carried along with the mobile phone. There is little opportunity to run out of battery, and it is unnecessary as long as the mobile phone does not run out of battery. Therefore, there is a problem that the possibility of forgetting to carry the dry battery charger is high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is possible to prevent a battery of a mobile phone from being damaged due to overcharging. The purpose is to provide a vessel.

[0006]

According to the first aspect of the present invention, there is provided a booster for charging a mobile phone by using a boosted DC voltage obtained by boosting an output voltage of a dry cell, and for determining a state of charge from the mobile phone. Control means for varying the boosted DC voltage in response to the command signal and stopping the output of the boosted DC voltage when the mobile phone is fully charged.

As described above, the boosted DC voltage is varied according to the signal indicating the state of charge from the mobile phone, and the output of the boosted DC voltage is stopped when the mobile phone is fully charged. Can be prevented, and the battery of the mobile phone can be prevented from being damaged by overcharging. The invention according to claim 2 is a battery charger for a mobile phone according to claim 1,
An incoming call report unit is provided for receiving an incoming response radio wave from the mobile phone and reporting the incoming call.

[0008] As described above, the mobile phone receives the radio wave of the incoming call response and reports the incoming call, so that the usefulness is improved and the possibility of forgetting the mobile phone is reduced. According to a third aspect of the present invention, in the battery charger for a mobile phone according to the first aspect, an end of the circuit main body including the boosting unit and the control unit and a lid that stores the dry battery are rotatable. When the battery is not charged, the circuit body is folded and stored in the lid.

As described above, when the battery is not charged, the circuit main body is folded and stored in the cover, thereby making it possible to reduce the size and to make the device portable.

[0010]

1 (A) and 1 (B) are a front view and a side view of a mobile phone charger according to an embodiment of the present invention in an unfolded state, and FIGS. 2 (A) and 2 (B). 3A and 3B show a front view and a side view of the first folded state, and FIGS.
It shows a front view and a side view in a folded state.

1 (A) and 1 (B), a mobile phone charger 10 comprises a circuit body 12, an upper cover 14, and a lower cover 16. An electronic circuit constituting a charger is provided inside the circuit body 12, and a button battery 18 for supplying power to the electronic circuit is accommodated therein. A connector 20 for connection to an input / output terminal of a mobile phone is provided at one end 12a of the circuit main body 12, and the other end 12b of the circuit main body 12 is connected to the upper lid 1
4 is rotatably supported by one end 14a.

A storage portion 22 for storing two AAA batteries is formed in the upper lid portion 14. At the time of charging, two AAA batteries 23 are stored in the storage portion 22 as shown in FIG. Is stored. The positive and negative electrodes of the two AAA batteries 23 are connected in series by contacting terminals (not shown), and are connected to the electronic circuit of the circuit body 12. The other end 14 b of the upper lid 14 is rotatably supported by one end 16 a of the lower lid 16, and rotates the lower lid 16 when the AAA battery 23 is stored in the storage 22. To move the locking portion 16c formed on the other end portion 16b of the lower lid portion 16 to the upper lid portion 1.
4 is engaged with one end 14a of the storage section 2 so that
The separation of the two AAA batteries 23 housed in the battery 2 can be restricted.

At the time of non-charging when the AAA battery 23 is detached from the storage section 22, the circuit body section 12 is rotated to
As shown in FIGS. 3 (A) and 3 (B), it is folded and stored in the upper lid portion 14, and further, the lower lid portion 16 is rotated so as to be rotated as shown in FIGS.
As shown in FIG. 2B, the locking portion 1 is folded toward the upper lid 14 side.
6 c is engaged with one end 14 a of the upper lid 14, and the circuit body 12 can be held and accommodated by the upper lid 14 and the lower lid 16. This makes it possible to reduce the size of a portable device.

FIG. 4 is a block diagram showing an embodiment of the mobile phone charger according to the present invention. In the figure, a dry cell 30 is a AAA battery 23 stored in the storage section 22 and connected in series.
DC 3V is supplied to the booster circuit 32. The booster circuit 32 is D
A C / DC inverter, which is supplied with a control signal indicating an output voltage from a control circuit 36 constituted by a microcomputer, boosts DC 3 V from the dry cell 30 to the boosted DC voltage instructed, and supplies the boosted DC voltage to the stabilizing circuit 34. The switching signal used for boosting is supplied to a control circuit 36 composed of a microcomputer.

The stabilizing circuit 34 stabilizes the boosted DC voltage supplied from the boosting circuit 32 and supplies the stabilized DC voltage to the output circuit 38.
The output circuit 38 switches whether to output a boosted DC voltage in accordance with an output control signal supplied from the control circuit 36. At the time of charging, the input / output terminal of the mobile phone 60 is fitted and connected to the connector 20, and 5 V DC output from the output circuit 38 is supplied to the mobile phone through the connector 20, and the battery of the mobile phone 60 is charged.

A battery recognition signal indicating whether or not the mobile phone 60 is charging the battery and a battery status signal indicating whether or not the charging of the battery is completed are input from the mobile phone through the connector 20. It is supplied to the control circuit 36. The control circuit 36 supplies a control signal to the booster circuit 32 in accordance with the battery recognition signal and the battery state signal to instruct the booster DC voltage, confirms the boosted DC voltage from the duty ratio of the switching signal, and An output control signal is supplied to the output circuit 38 to control the output of the boost DC voltage, that is, the charging voltage. At the same time, the state of charge is displayed on the LED display 40.

FIG. 5 shows a flowchart of an embodiment of the charging control process executed by the control circuit 36. In the figure, in step S10, an initial value (fixed value, for example, 4 V) is set for the step-up DC voltage. In step S12, the step-up DC voltage is instructed to the step-up circuit 32, and the output circuit 38 is switched to the on state to switch the step-up DC voltage. The voltage is supplied to the mobile phone 60, and LE
The red LED blinks on the D display 40.

In step S14, it is determined whether or not the battery recognition signal from the mobile phone 60 is charging the battery. If the battery is not charging, it is determined that charging cannot be performed because the boosted DC voltage is low, and the process proceeds to step S16. The DC voltage is increased by a predetermined value (for example, 0.5 V). Thereafter, in step S18, the boosted DC voltage is increased to the upper limit value VMAX (for example, 6
V) is determined, and if not, the process proceeds to step S12. If the boost DC voltage exceeds the upper limit value VMAX in step S18, the boost DC voltage becomes the upper limit value VMAX.
Charging is not possible even if it exceeds
20 to switch the output circuit 38 to the off state,
The display on the D display 40 is stopped (end report), and this process ends.

On the other hand, if the battery recognition signal from the mobile phone 60 indicates that the battery is being charged in step S14,
In step S22, the green LED is lit on the LED display 40 (charging report). This time, in step S24, it is determined whether or not the battery state signal from the mobile phone 60 indicates that the charging of the battery is completed. At the time when the charging of the battery is completed, the process proceeds to step S26 to turn off the output circuit 38. Switching is performed, the display of the LED display 40 is stopped (end report), and this processing is ended.

As described above, the boosted DC voltage is varied according to the signal indicating the state of charge from the mobile phone, and the output of the boosted DC voltage is stopped when the mobile phone is fully charged. Can be prevented, and the battery of the mobile phone can be prevented from being damaged by overcharging. Referring back to FIG. 4, the high frequency signal of the mobile phone frequency band received by the antenna 42 is amplified by the amplifier circuit 44 and then supplied to the detection circuit 46, where the signal of the mobile phone frequency is detected. The detection circuit 46 supplies a signal that becomes, for example, a high level when the detection output is equal to or higher than a predetermined level to the control circuit 36. When the control circuit 36 is supplied with the high-level signal from the detection circuit 46, the control circuit 36 blinks the blue LED on the LED display 40 to report the incoming call.

When an incoming call is called from the mobile phone base station to the mobile phone 60, the mobile phone responds to the base station. At this time, the mobile phone charger 10 of the present invention located near the mobile phone 60 detects the call for the response and performs the above-described incoming call display. Note that the button battery 18 shown in FIG.
0, an amplifier circuit 44, and a detection circuit 46. As described above, since the incoming call response radio wave received by the mobile phone is received and the incoming call is reported, the usefulness is improved, and the possibility of forgetting the mobile phone is reduced.

By the way, as the connector 20, for example, a 16-pin connector is used, and it is possible to charge most mobile phones used in Japan. For example, when a portable telephone of another foreign standard does not conform to the 16-pin connector 20, the adapter shown in FIG. 6 is used. In FIG. 6, the jack 50 is adapted to the connector 20 and is fitted and connected to the connector 20. Jack 50
Are connected to terminals in a jack 54 for a mobile phone of another standard by a cord 52. By connecting this jack 54 to a mobile phone of another standard,
The battery can be charged.

The boosting circuit 32, the stabilizing circuit 34, and the output circuit 38 correspond to the boosting means described in the claims.
6 corresponds to the control means, the antenna 42, the detection circuit 46,
The LED display 40 corresponds to an incoming call report unit.

[0024]

As described above, the first aspect of the present invention provides
The boost DC voltage is varied according to the signal indicating the state of charge from the mobile phone, and the output of the boost DC voltage is stopped when the mobile phone is fully charged, so that the battery of the mobile phone can be prevented from being overcharged. The battery of the mobile phone can be prevented from being damaged.

According to the second aspect of the present invention, an incoming call report is received by receiving a radio wave of an incoming call response made by a mobile phone.
The usability is improved and the possibility of forgetting the mobile phone is reduced.
According to the third aspect of the present invention, when the battery is not charged, the circuit main body is folded and stored in the lid, so that the circuit can be reduced in size and can be conveniently carried.

[Brief description of the drawings]

FIG. 1 is a front view and a side view of a mobile phone charger according to an embodiment of the present invention in an unfolded state.

FIG. 2 is a front view and a side view of the battery charger for a mobile phone according to the present invention in a first folded state.

FIG. 3 is a front view and a side view of the second folded state of the mobile phone charger of the present invention.

FIG. 4 is a block diagram of an embodiment of the mobile phone charger of the present invention.

FIG. 5 is a flowchart of an embodiment of a charging control process executed by the control circuit 36;

FIG. 6 is a front view of an adapter used in the mobile phone charger of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mobile phone charger 12 Circuit main body part 14 Upper lid part 16 Lower lid part 18 Button battery 20 Connector 22 Storage part 23 AAA battery 32 Boosting circuit 34 Stabilizing circuit 36 Control circuit 38 Output circuit 40 LED display 42 Antenna 44 Amplifier circuit 46 Detection circuit 60 Mobile phone

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02J ^7/ 00-7/12 H02J ⁷ /34-7/36

Claims (3)

(57) [Claims] 1. A boosting means for generating and using a boosted DC voltage obtained by boosting an output voltage of a dry cell to charge a mobile phone, and varying the boosted DC voltage in response to a signal from the mobile phone indicating a charging state; Control means for stopping output of the boosted DC voltage when the mobile phone is fully charged. 2. The charger for a mobile phone according to claim 1, further comprising an incoming call report unit that receives a radio wave of an incoming call response performed by the mobile phone and reports an incoming call. 3. The battery charger for a mobile phone according to claim 1, wherein the circuit main body including the boosting means and the control means, and a lid for accommodating the dry battery are rotatably supported at their ends. A battery charger for a mobile phone, wherein the circuit body is folded and stored in the lid when charging is not performed.