KR20040038005A - Mobile phone for producing charge current of battery and method for charging battery using the same - Google Patents

Abstract

PURPOSE: A mobile terminal for generating charging current of battery and a method for charging a battery using the same are provided to charge the battery by using an induced electromotive force generated whenever the slide type mobile terminal is slid. CONSTITUTION: A mobile terminal comprises a unit(610) for generating an induced electromotive force, a voltage converter(620) for converting '-' voltage generated from the part for generating an induced electromotive force to '+' DC voltage, a first voltage capacitor(630) for storing the converted DC voltage, a controller(650) for charging the battery by applying the voltage of the first voltage capacitor, a constant voltage unit(670) for converting the voltage supplied from the first voltage capacitor to the voltage for charging the battery and applying the voltage to the battery through the power terminal, and a second switching unit for applying the voltage of the first voltage capacitor to the constant voltage unit.

Description

A mobile communication terminal for generating a battery charging current and a battery charging method using the same {Mobile phone for producing charge current of battery and method for charging battery using the same}

The present invention relates to a mobile communication terminal for generating a battery charging current and a battery charging method using the same, and in particular, a mobile communication terminal capable of charging a battery using induction electromotive force generated whenever the slide type mobile communication terminal is slid. And it relates to a battery charging method using the same.

Mobile communication terminals are widely used with the development of society as a convenient means of communication and data transmission at any place during the movement.In the case of mobile phones, they have been developed from analog to digital method due to qualitative and quantitative development. In recent years, personal mobile communication and satellite personal mobile communication have become more common. The mobile communication terminal uses a rechargeable battery that stores energy because it is used by a person.

1 is a configuration diagram of a battery of a general mobile communication terminal, and includes a cell 110 in which power is charged and discharged, and a protection circuit 120 for protecting the cell 110.

In addition, a general battery has both terminals (+) and a negative terminal (−) connected to an external electronic device to supply or receive power.

Therefore, when charging the cell 110, both terminals (+) and the negative terminal (-) are connected to the power supply terminal of the charger. At this time, both terminals (+) and the negative terminal (-) of the battery and the charger to be connected well.

In addition, in order to use the battery as a power source of the mobile communication terminal, the battery is mounted in the mobile communication terminal, so that both terminals (+) and the negative terminal (-) of the battery and the mobile communication terminal are well connected.

The protection circuit 120 prevents overcurrent and overvoltage from being applied to the cell 110 through the charger to prevent overcharging, and when the battery is used as a power source of the mobile terminal, It prevents over discharge.

Recently, with the development of memory technology and mobile communication terminal technology, user data that can be stored in a mobile communication terminal has been diversified and expanded. Examples of user data that can be stored in a mobile communication terminal include telephone book data storing desired telephone numbers, personal notebook data storing user schedules and memos, and messages.

As user data that can be stored in the mobile communication terminal is diversified and enormous, efficient methods for managing user data of the mobile communication terminal have been proposed.

In order to confirm the user data of the mobile communication terminal as described above, the mobile communication terminal must be supplied with sufficient power from a battery.

If the battery mounted in the mobile communication terminal is discharged, the power of the mobile communication terminal is automatically turned off, so that user data stored in the mobile communication terminal cannot be confirmed. At this time, in order for the user to check the user data stored in the mobile communication terminal, the user should replace the battery with a charged battery.

In addition, users generally do not carry a separate replacement battery in addition to the battery mounted in the mobile terminal, so if the user data stored in the mobile terminal has to be urgently checked when the mounted battery is discharged, it can be checked. There was no problem.

Accordingly, an object of the present invention is to provide a mobile communication terminal capable of generating induced electromotive force whenever sliding the slide type mobile communication terminal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mobile communication terminal capable of charging a battery using induction electromotive force generated whenever the slide type mobile communication terminal is slid and a battery charging method using the same.

An object of the present invention is to provide a mobile communication terminal and a battery charging method using the same, which can significantly reduce the number of charges of a battery using a charger by charging a battery with an induced electromotive force generated during sliding of a slide type mobile communication terminal.

1 is a configuration diagram of a battery mounted in a general mobile communication terminal.

Figure 2 is a perspective view of a slide type mobile communication terminal to which the present invention is applied.

3 is an exploded perspective view of the slide module in FIG.

4 is a perspective view of the slide module shown in FIG.

5 is a cross-sectional view of the upper housing in FIG.

6 is a block diagram of a mobile communication terminal for generating a battery charging current according to an embodiment of the present invention.

7 is a perspective view of a mobile communication terminal for generating a battery charging current according to an embodiment of the present invention.

8 is a rear cross-sectional view of the upper housing in FIG.

9 is a rear perspective view of the upper housing in FIG. 7;

10 is a view showing a state in which the magnet in FIG. 7 is inserted into the coil.

11 is a characteristic diagram of induced electromotive force generated in a mobile communication terminal according to an embodiment of the present invention.

12 is a flowchart illustrating a battery charging method of a mobile communication terminal according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

600: mobile communication terminal 610: induction electromotive force generating unit

620: voltage converter 630: first voltage accumulator

640: second voltage storage unit 650: control unit

660: first switching unit 670: constant voltage unit

680: second switching unit

In order to achieve the above object, the present invention includes a slide module equipped with a slide member for sliding the upper housing and the keypad and the lower housing with a circuit board attached to the liquid crystal display, the mounted battery is A slide type mobile communication terminal for charging the battery, comprising: induction electromotive force generating means for generating induction electromotive force; Voltage conversion means for converting a '-' voltage generated from the induced electromotive force generating means into a '+' DC voltage; First voltage accumulating means for accumulating the DC voltage converted by the voltage converting means; Control means for charging the battery by applying a voltage of the first voltage accumulating means according to the charge capacity of the battery; Constant voltage means for converting the voltage provided from the first voltage accumulating means into a voltage level for charging the battery and applying the voltage to the battery through a power supply terminal; And second switching means for switching by the control means to apply the voltage stored in the first voltage accumulating means to the constant voltage means.

The present invention provides a method of charging a battery mounted with an internal voltage in a slide type mobile communication terminal consisting of an upper housing and a lower housing, wherein the induced voltage is generated when the upper housing and the lower housing are slid. First step to accumulate in; A second step of determining whether the battery is in a fully charged state when the voltage stored in the first voltage accumulating unit is greater than a predetermined reference voltage; A third step of dividing the voltage stored in the first voltage accumulator and storing the voltage stored in the second voltage accumulator if the battery is in a fully charged state; And a fourth step of charging the battery by applying a voltage stored in the first voltage accumulator or the second voltage accumulator if the battery is discharged to a predetermined level or less as a result of the determination.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

FIG. 2 is a perspective view of a slide-type mobile communication terminal to which the present invention is applied and includes an upper housing having electronic devices such as a speaker, a function key, and a liquid crystal display 211 and first and second slide modules 212 and 213 attached thereto. 210 and a lower housing 220 to which electronic elements such as a microphone, an antenna, a battery, and a keypad 221 are attached.

The slide-type mobile communication terminal 200 electrically connects a circuit board for driving an electronic device mounted on the upper housing 210 and a circuit board for driving an electronic device mounted on the lower housing 220. A flexible printed circuit board (FPCB) 230 is provided.

In the case of such a slide type mobile communication terminal 200, when a function key, a microphone, and a speaker are exposed to the outside to select the reception of a call, the phone can be opened without opening the upper housing 210 and the lower housing 220. Can be received.

FIG. 3 is an exploded perspective view of the slide module of FIG. 2, in which first and second holders 312 and 313 for fixing the lower housing 220 to the first slide module 212 are attached to the upper housing 210. ) And a slide member 310 to allow the lower housing 220 to slide, a support plate 320 fixed to the upper housing 210, and a support plate 320 for supporting the slide member 310, and a slide attached to the support plate 320. The guide plate 330 is fixed to the member 310 and a guide hole h1 is formed to guide the sliding of the slide member 310.

The slide member 310 includes a leaf spring 311 attached to the support plate 320 by a guide plate 330 and a leaf spring spaced apart from each other to fix the lower housing 220 to the first slide module 212. A ball 315 is disposed between the first and second fixing brackets 312 and 313 protruding in the direction of the guide plate 330 by vertically penetrating the 311 and between the leaf spring 311 and the support plate 320. For insertion, a portion of the leaf spring 311 between the first and second anchors 312 and 413 consists of a raised portion 314 which is raised.

In addition, the first and second fixing brackets 312 and 313 are formed with screw grooves into which screws 301 and 302 can be inserted, which is formed by the holes h2 and the lower housing 220 in FIG. The lower module 220 is attached to the upper housing 210 by inserting the screws 301 and 302 into the screw grooves after coupling the first and second fixtures 312 and 313 to the h3), respectively. It is for fixing to 212.

The backing plate 320 has a rectangular parallelepiped shape in which one side is open, and includes a rectangular bottom surface 321 to which the leaf spring 311 is in contact with and four vertical wall surfaces having a predetermined height from the bottom surface 321. Here, the heights of the four vertical walls are formed higher than the thickness of the leaf springs 311 and lower than the heights of the first and second fixing rods 312 and 413.

In addition, the uneven portion formed on the vertical wall surface of the support plate 320 when the guide plate 330 is coupled to the inside of the support plate 320 is folded vertically in the direction in which the guide plate 330 is coupled, which is the support plate It is to solidify the combination of the 320 and the guide plate 330.

In addition, two holes h4 and h5 are formed in the bottom surface 321 of the support plate 320 so as to be caught by the ball 315 when sliding the slide member 310.

The guide plate 330 has a rectangular parallelepiped shape in which one surface similar to the support plate 320 is open. The guide plate 330 has a rectangular plane 331 having a guide hole h1 formed at the center thereof, and four vertical planes having a predetermined height from the plane 331. Made of walls. Here, the four vertical walls have a height substantially equal to the vertical walls of the support plate 320, and are inserted into the support plate 320 when the slide module 212 is assembled, and thus the vertical walls of the guide plate 330. The outer side contacts the inner side of the vertical wall surfaces of the base plate 320.

In addition, the plane 331 of the guide plate 330 has a predetermined width spaced apart from the vertical walls and the guide hole h1, and the slide member 310 of the first slide module 212 slides by this width. The guide space that can be formed is formed.

4 is a perspective view illustrating a coupling state of the slide module of FIG. 3.

In the state in which the first slide module 212 is coupled as shown in FIG. 4, the holes h2 and h3 of the lower housing 220 are provided in the first and second fixtures 312 and 413 protruding above the guide plate 330. After the insertion, the lower housing 220 is fixed to the first slide module 212 attached to the upper housing 210 by screws 301 and 302.

As such, in the state in which the first slide module 212 is coupled, the slide member 310 slides along the guide hole h1 of the guide space and the guide plate 330. That is, the upper and lower housings 210 and 320 coupled by the slide module 212 may be slid by the slide member 310 moved along the guide hole h1.

Meanwhile, the second slide module 213 has the same structure as the first slide module 212.

FIG. 5 is a cross-sectional view of the upper housing in FIG. 3, showing a cross section of a portion to which the slide module 212 is attached.

In FIG. 5, reference numerals h6 and h7 are bar type grooves, and the grooves h6 and h7 have bar protrusions 222 and 223 protruding on both sides of the lower housing 220 in FIG. 2, respectively. Is inserted. This is to maintain the balance so as to slide in a linear direction between the upper and lower housings 210 and 220 when the slide type mobile communication terminal 200 is opened and closed by sliding.

The mobile communication terminal of the present invention for generating an induction electromotive force for battery charging by attaching a magnet and a coil to the slide-type mobile communication terminal having the above structure will be described in detail with reference to the accompanying drawings.

6 is a block diagram of a mobile communication terminal for generating a battery charging current according to an embodiment of the present invention.

Referring to FIG. 6, the mobile communication terminal of the present invention converts the '-' voltage generated from the induced electromotive force generation unit 610 and the induced electromotive force generation unit 610 into a '+' DC voltage. The voltage converter 620 for converting, the first voltage accumulator 630 for accumulating the DC voltage converted by the voltage converter 620, and the voltage applied from the first voltage accumulator 630 The control unit 650 for charging the battery 500 by applying the voltage of the second voltage accumulator 640 and the first and second voltage accumulator 630 according to the charge capacity of the battery 500. And a first switching unit 660 for applying the voltage stored in the first voltage accumulating unit 630 by the controller 650 to the second voltage accumulating unit 640, and a first voltage accumulating unit ( Power supply terminals (+,-) by converting the voltage provided from the 620 or the second voltage accumulator 630 to the magnitude of the charging voltage of the battery 500 Applying to the battery 500 through the constant voltage unit 670 and the voltage controlled by the control unit 650 is stored in the first voltage storage unit 620 or the second voltage storage unit 630 constant voltage unit 670 And a second switching unit 680 for applying.

Here, the first and second voltage accumulators 630 and 640 may be implemented using a capacitor or the like.

The battery charging process of the mobile communication terminal of the present invention having the configuration as described above will be described in detail as follows.

When the slide-type mobile communication terminal 600 slides, the induction electromotive force generation unit 610 generates a voltage, and the voltage converter 620 generates a '+' voltage generated from the induction electromotive force generation unit 610 by '+'. The signal is converted into a DC voltage and applied to the first voltage accumulator 630.

At this time, the controller 650 determines whether the voltage stored in the first voltage accumulator 630 is greater than the reference voltage of 2.7V, and if it is less than the reference voltage of 2.7V, the controller 650 controls the first voltage accumulator 630. The first and second switching units 660 and 680 are blocked to prevent leakage of the accumulated voltage.

If the voltage accumulated in the first voltage accumulator 630 is greater than the reference voltage of 2.7 V, the controller 650 determines whether the battery 500 is in a fully charged state. As a result of determination, when the battery 500 is in a fully charged state, the controller 650 switches the first switching unit 660 toward the second voltage accumulator 640 so that the voltage of the first voltage accumulator 630 is second. It is applied to the voltage accumulator 640 to be accumulated.

However, when it is determined that the charge capacity of the battery 500 is discharged to a predetermined level or less, the controller 650 switches the second switching unit 680 in the direction of the battery 500 to thereby form the first voltage accumulator 630. Is applied to the battery 500. At this time, when the voltage of the first voltage accumulator 630 is applied to the battery 500 and is lower than the reference voltage 2.7V, the controller 650 applies the voltage of the first voltage accumulator 630 to the battery 500. The second switching unit 680 is blocked so that the voltage of the second voltage accumulator 640 is greater than the reference voltage of 2.7V.

If the voltage of the second voltage accumulator 640 is greater than the reference voltage of 2.7V, the controller 650 switches the second switch 680 toward the battery 500 to determine the second voltage accumulator 630. ) Is applied to the battery 500. At this time, when the voltage of the second voltage accumulator 630 is applied to the battery 500 and is lower than the reference voltage 2.7V, the controller 650 applies the voltage of the second voltage accumulator 630 to the battery 500. The second switching unit 680 is blocked so as not to.

On the other hand, the constant voltage unit 670 converts the voltage provided from the first voltage accumulator 620 or the second voltage accumulator 630 through the second switching unit 680 to the voltage level for charging the battery 500. To the battery 500 through the power terminals (+,-).

7 is a perspective view of a mobile communication terminal for generating a battery charging current according to an embodiment of the present invention, the electronic device and the first and second slide modules (711, 712), such as a speaker, a function key and a liquid crystal display The upper housing 710 is attached, and the lower housing 720 to which electronic elements such as a microphone, an antenna, a battery, and a keypad are attached.

The first slide module 711 is equipped with a cylindrical magnet 713 used for generating an induced electromotive force and a coil 714 into which the magnet 713 can slide and be inserted. Here, since the coil 714 is wound like a spring, when the upper housing 710 is slid, the magnet 713 may be inserted into or exit from the coil 714.

In addition, a cylindrical magnet 715 and a coil 716 are mounted to the second slide module 712, and have the same structure as that of the first slide module 711.

As shown in the drawing, the induction electromotive force generator 610 is composed of magnets 713 and 715 and coils 714 and 716.

Meanwhile, the coil 714 attached to one end of the first slide module 711 is connected to the circuit board in the lower housing 720 through the wire 717 having good bendability.

Similarly, the coil 716 attached to one end of the second slide module 712 is connected to the circuit board in the lower housing 720 through the flexible wire 718.

Thus, when the upper housing 710 is slid, the induction generated in the coils 714 and 716 as the magnets 713 and 715 are inserted into or exit from the inserted coils 714 and 716. The electromotive force is applied to the voltage converter 620 mounted on the circuit board in the lower housing 720 through the wires 717 and 718, respectively.

In addition, the functional elements 620, 630, 640, 650, 660, 670, and 680 in FIG. 6 are mounted on the circuit board in the lower housing 720.

8 and 9, the structure of the upper housing 710 in which the magnets 713 and 715 and the coils 714 and 716 are mounted will be described in more detail.

FIG. 8 is a rear cross-sectional view of the upper housing in FIG. 7.

9 is a rear perspective view of the upper housing in FIG. 7;

As shown in FIGS. 8 and 9, the first slide module 711 has a slide member 721 for sliding the upper housing 710 and the lower housing 720, as described above with reference to FIGS. 3 and 4. ).

As shown in the figure, the magnet 713 is attached to the front end portion of the slide member 721 in a counterweight. The coil 714 wound in a spring shape is mounted in a direction in which the slide member 721 to which the magnet 713 is attached slides, and is mounted at one end of the first slide module 711. Here, the magnet 713 is preferably attached to the slide member 721 by bonding or to the slide member through a fastening method using a screw.

Since the magnet 713 and the coil 714 are mounted as described above, when the upper housing 710 and the lower housing 720 slide, the magnet 713 slides along the slide member 721, as shown in FIG. 10. It is inserted into the coil 714.

In this state in which the magnet 713 is inserted into the coil 714, when the slide member 721 slides in the opposite direction of the coil 714, the magnet 713 is released from the coil 714.

As described above, since the slide member 721 slides reciprocally in a linear direction on the first slide module 711, the magnet 713 attached to the front end of the slide member 721 into the coil 714. At the moment of insertion or exit, induced electromotive force is generated on the coil 714.

At this time, looking at the characteristics of the induced electromotive force generated in the coil 714, as shown in FIG. In FIG. 11, time t1 represents the magnitude of induced electromotive force at the moment when the magnet 713 is inserted into the coil 714 or exits from the inside of the coil 714, and the time t2 is the magnet 713. 714 represents the magnitude of the induced electromotive force at the moment of being fully inserted into the inside or at the moment of completely exiting from the inside of the coil 714.

As shown in FIG. 11, it can be seen that the induced electromotive force generated in the coil 714 is generated at the moment when the magnet 713 slides inside the coil 714.

Meanwhile, the second slide module 712 has the same structure as the first slide module 711.

The process of charging the battery by generating the induced electromotive force in the mobile communication terminal of the present invention having the above structure will be described in detail with reference to FIG. 12 as follows.

12 is a flowchart illustrating a battery charging method of a mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 12, when the user slides the upper housing 710 and the lower housing 720 of the slide-type mobile communication terminal 600 (S1201), the mobile communication terminal 600 generates induced electromotive force and generates the generated voltage. Accumulation is performed in the first voltage accumulator 630 (S1202).

At this time, the mobile communication terminal 600 determines whether the voltage stored in the first voltage storage unit 630 is greater than the reference voltage of 2.7V (S1203), and if it is less than the reference voltage of 2.7V, the mobile communication terminal 600 is a first The voltage accumulated in the one voltage storage unit 630 is stored so as not to leak.

If the accumulated voltage is greater than the reference voltage of 2.7V in the determination process (S1203), the mobile communication terminal 600 determines whether the battery 500 is in a full charge state (S1204). As a result of determination, when the battery 500 is in a fully charged state, the mobile communication terminal 600 divides the voltage of the first voltage accumulator 630 and accumulates the voltage in the second voltage accumulator 640 (S1205).

However, in the determination process (S1204), if the charge capacity of the battery 500 is discharged to a predetermined level or less, the mobile communication terminal 600 applies the voltage of the first voltage accumulator 630 to supply the battery ( 500) (S1206). In this state, while charging the battery 500 with the voltage of the first voltage accumulator 630, the mobile communication terminal 600 determines whether the voltage of the first voltage accumulator 630 is greater than the reference voltage of 2.7V. In operation S1207, when the reference voltage is greater than 2.7 V, the mobile communication terminal 600 continuously applies the voltage of the first voltage accumulator 630 to charge the battery 500 and determine a full charge of the battery 500. Proceed to (S1204).

As a result of the determination in operation S1207, when the voltage of the first voltage accumulator 630 is less than the reference voltage of 2.7 V, the mobile communication terminal 600 has a voltage of the second voltage accumulator 640 as the reference voltage of 2.7. If it is greater than V (S1208), if the reference voltage is greater than 2.7V, the mobile communication terminal 600 charges the battery 500 by applying the voltage of the second voltage accumulator 630 (S1209).

If the determination step S1208 determines that the voltage of the second voltage accumulator 630 is less than the reference voltage of 2.7 V, the mobile communication terminal 600 stops charging the battery 500 (S1210). .

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention has the following effects by charging the battery using the induced electromotive force generated every time the slide-type mobile communication terminal is slid.

First, it is possible to greatly reduce the number of charges of the battery using the charger for the convenience of the user.

Second, it is possible to prevent the battery from being completely discharged while the user is carrying the mobile communication terminal.

Third, even if the user discharges the battery to a certain level or less during an external activity, the user can use the mobile terminal by charging the battery to a certain level or more by induction electromotive force.

Claims (13)

In the slide-type mobile communication terminal having an upper housing with a liquid crystal display and a slide module equipped with a slide member for sliding the lower housing with a keypad and a circuit board, and for charging the mounted battery with an internal voltage. , Induction electromotive force generating means for generating induction electromotive force; Voltage conversion means for converting a '-' voltage generated from the induced electromotive force generating means into a '+' DC voltage; First voltage accumulating means for accumulating the DC voltage converted by the voltage converting means; Control means for charging the battery by applying a voltage of the first voltage accumulating means according to the charge capacity of the battery; Constant voltage means for converting the voltage provided from the first voltage accumulating means into a voltage level for charging the battery and applying the voltage to the battery through a power supply terminal; And Second switching means for applying the voltage stored in the first voltage accumulating means and switched by the control means to the constant voltage means; Mobile communication terminal comprising a. The method of claim 1, Second voltage accumulating means for accumulating a voltage applied from said first voltage accumulating means; And Second switching means for applying the voltage stored in the first voltage accumulating means and switched by the control means to the second voltage accumulating means; Mobile communication terminal comprising a. The method of claim 2, And the first and second voltage accumulating means each comprises a capacitor. The method of claim 2, And the control means switches the first switching means toward the second voltage accumulating means so that the voltage of the second voltage accumulating means is applied to the battery through the constant voltage means. The method of claim 4, wherein When the voltage of the second voltage accumulating means is applied through the first switching means, the constant voltage means converts the voltage applied from the second voltage accumulating means into a voltage level for charging the battery and supplies the power. A mobile communication terminal characterized in that applied to the battery through a terminal. The method according to any one of claims 1 to 5, The induction electromotive force generating means, A mobile communication terminal comprising a magnet attached to a front end of the slide member and a coil attached to one end of the slide module. The method of claim 6, The magnet is formed in a cylindrical shape, the mobile communication terminal, characterized in that attached to the slide member in the shape of a counterweight. The method of claim 6, And the coil is wound in a cylindrical shape such as a spring so that the magnet is inserted into the coil or exits from the inserted state when the slide member is slid. The method of claim 8, And an induction electromotive force is generated on the coil at the moment when the magnet is inserted into the coil or exits from the inserted state when the slide member is slid. The method of claim 9, The induced electromotive force generated by the coil is applied to the voltage conversion means mounted on the circuit board in the lower housing via a wire. The method of claim 10, The wire is a mobile communication terminal, characterized in that made of a good bending property. In the slide-type mobile communication terminal consisting of the upper housing and the lower housing for charging the battery mounted with the internal voltage, A first step of generating an induced electromotive force and accumulating the first voltage accumulator when the upper housing and the lower housing are slid; A second step of determining whether the battery is in a fully charged state when the voltage stored in the first voltage accumulating unit is greater than a predetermined reference voltage; A third step of dividing the voltage stored in the first voltage accumulator and storing the voltage stored in the second voltage accumulator if the battery is in a fully charged state; And A fourth step of charging the battery by applying a voltage stored in the first voltage accumulator or the second voltage accumulator if the battery is discharged to a predetermined level or less as a result of the determination; Battery charging method of the mobile communication terminal comprising a. The method of claim 12, In the fourth step, The mobile communication terminal charging the battery by applying a voltage of the first voltage accumulator and determining whether the voltage of the first voltage accumulator is greater than the reference voltage of 2.7V; As a result of the determination in step 4-1, when the voltage of the first voltage accumulator is greater than the reference voltage of 2.7V, the mobile communication terminal continuously applies the voltage of the first voltage accumulator to charge the battery and the second voltage. Step 4-2, proceeding to step; As a result of the determination in step 4-1, when the voltage of the first voltage accumulator is less than the reference voltage of 2.7V, the mobile communication terminal determines whether the voltage of the second voltage accumulator is greater than the reference voltage of 2.7V. 4-3 steps; As a result of the determination in step 4-3, when the voltage of the second voltage accumulator is greater than the reference voltage of 2.7V, the mobile communication terminal applies the voltage of the second voltage accumulator to charge the battery. step; And As a result of the determination in step 4-3, if the voltage of the second voltage accumulator is less than the reference voltage of 2.7V, the mobile communication terminal stops charging of the battery; Battery charging method of the mobile communication terminal comprising a.