KR101602226B1 - Portable terminal - Google Patents

Abstract

According to the present invention, there is provided a solar cell comprising a terminal body having first and second surfaces different from each other and having a battery, first and second solar cells respectively mounted on the first and second surfaces and converting light energy into electric energy, First and second solar cells connected to the first and second solar cells at a collective position and connected to a single line; a charging unit for charging the battery; And a controller for equally matching the amounts of currents of the first and second lines supplied to the collective position under specific conditions when the amounts of generated currents are different from each other.

Description

[0001] PORTABLE TERMINAL [0002]

The present invention relates to a portable terminal having solar cells arranged on a plurality of surfaces.

A portable terminal is a portable device that is portable and has one or more functions such as voice and video call function, information input / output function, and data storing function.

As the functions of the portable terminal are diversified, for example, the portable terminal has complicated functions such as photographing and photographing of a moving picture, reproduction of music or video file, reception of a game and broadcasting, and is implemented as a multimedia device .

In order to implement complex functions in multimedia devices, various new attempts have been made in terms of hardware or software. For example, a user interface environment is provided for a user to easily and conveniently search for or select a function.

In addition, a portable terminal is regarded as a personal portable product for expressing its own personality, and various designs are required.

In recent years, as interest in electronic devices using environmentally friendly technologies has been increasing, there have been increasing cases of applying solar cells to portable terminals. The solar cell is configured to charge the portable terminal using solar light.

The present invention is to prevent electrical collision between solar cells disposed on a plurality of surfaces of a terminal and to maximize the amount of charge.

According to an aspect of the present invention, there is provided a portable terminal comprising: a terminal body having first and second surfaces different from each other and having a battery; a first body mounted on the first and second surfaces, A charging unit for charging the battery, the first and second solar cells being respectively connected to the first and second solar cells at a collective position and connected to a single line; And a controller for matching the amounts of currents of the first and second lines supplied to the collective position under the specific conditions in the same manner when the amounts of current generated in the two solar cells are different from each other.

The portable terminal may further include a current monitor for measuring first and second current amounts respectively generated in the first and second solar cells, wherein the control unit controls the amounts of current supplied to the collective positions to the first and second solar cells, It can be matched to a small value of 2 amperes.

The specific condition may be a condition in which a larger current amount in the first and second current amounts becomes smaller than a value twice as small as the current amount.

The first and second lines may further include first and second switching units for opening and closing the first and second lines, respectively.

The control unit may be configured to turn off either the first or second switching unit when the amounts of current do not satisfy the specific condition.

The control unit may be configured to turn off either the first or second switching unit when any one of the first and second solar cells does not generate electrical energy.

The first and second illuminance sensors may further include first and second illuminance sensors for sensing brightness of light. The controller may control the first and second illuminance sensors based on sensing values of the first and second illuminance sensors, The amount of current generated in the solar cell can be detected.

The battery includes a plurality of battery cells connected in parallel to the charging unit, and a matching unit for impedance matching of the battery cells may be connected to the battery cells.

The present invention is characterized in that when the amount of electric current generated in each of the first and second solar cells is different from each other, the amounts of electric currents of the first and second lines supplied to the collective position under specific conditions are equally matched, It is possible to prevent electrical collision between the first and second solar cells and to maximize the amount of charge.

Also, the present invention minimizes the power loss by performing impedance matching through the pulse width modulation method on the battery cells connected in parallel to the charging unit.

Hereinafter, a portable terminal according to the present invention will be described in detail with reference to the drawings.

Hereinafter, a portable terminal related to the present invention will be described in detail with reference to the drawings. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations.

Hereinafter, a portable terminal related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, it should be noted that "module" and "part" may be used interchangeably.

The portable terminal can be implemented in various forms. For example, the portable terminal described in this specification may be used in various forms such as a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player) . ≪ / RTI >

Referring to FIG. 1, a portable terminal includes a first body 110 and a second body 120, which are foldably coupled to each other. However, the present invention is applicable to various types of terminals such as a slide type, a swivel type, a swing type, and a bar type, not limited to the 'folder type' portable terminal shown in FIG.

According to the present embodiment, the first body 110 and the second body 120 are rotatably connected through the hinge connection part 119. The hinge connection part 119 is provided with a cam device for providing an elastic force in the course of the rotation of the first body 110 and connecting means for electrically connecting the first body 110 and the second body 120 .

The state where the first body 110 is disposed in a state of being overlapped with the second body 120 may be referred to as a folding configuration and the first body 10 may be referred to as a second body 20 ) May be referred to as an unfolding configuration.

The mobile terminal operates mainly in the standby mode in the closed state, but the standby mode is also released by the user's operation. The portable terminal operates mainly in the communication mode in the open state, but is also switched to the standby mode by the operation of the user or a predetermined period of time.

The casing (housing, housing, cover, etc.) constituting the outer appearance of the first body 110 is formed by the front case 111 and the rear case 112. Various electronic components are embedded in the space formed by the front case 111 and the rear case 112.

At least one intermediate case may be additionally disposed between the front case 111 and the rear case 112.

The cases may be formed by injection molding a synthetic resin or may be formed to have a metal material such as stainless steel (STS) or titanium (Ti) or the like.

The display unit 113, the first sound output unit 115, the first image input unit 114, and the like may be disposed in the first body 110, specifically, the front case 111.

The display unit 113 includes a liquid crystal display (LCD) module, an OLED (Organic Light Emitting Diodes) module, etc. that visually express information, and the display unit 113 further includes a touch screen, It is also possible to enable input of information by the user.

The first image output unit 115 may be implemented as a receiver or a speaker. The first image input unit 114 may be implemented as a camera module for capturing an image or a moving image of a user, Can be implemented.

The front case 121 and the rear case 122 may form the case of the second body 120, as in the case of the first body 110. [ The first and second operating portions 123 and 124 may be disposed on the front surface of the second body 120, specifically, the front case 121. [

At least one of the front case 121 and the rear case 122 may include a third operating unit 125, an acoustical input unit 126, and an interface 127.

The first to third operating portions 123, 124, and 125 may be collectively referred to as a manipulating portion, and any manner can be adopted as long as the tactile manner in which the user operates with a tactile impression.

For example, the operation unit may be implemented by a dome switch or a touch screen, a touch pad, or a wheel, a jog type, a joystick, or the like, As shown in FIG.

The present embodiment illustrates first and second operating portions 123 and 124 in the form of a keypad and a third operating portion 125 in the form of a side key.

In terms of functions, the first operation unit 123 is for inputting commands such as start, end, and scroll, and the second operation unit 124 is for inputting numbers, letters, symbols, and the like. The third operation unit 125 may operate as a hot-key for performing a special function such as activation of the first image input unit 114, and the like.

The sound input unit 126 may be implemented in the form of a microphone, for example, to receive a user's voice, other sounds, and the like.

The interface 127 is a path for allowing a portable terminal related to the present invention to exchange data with an external device. For example, the interface 127 may be a wired or wireless connection terminal for connecting to an earphone, a port for short range communication (for example, an IrDA port, a Bluetooth port, a wireless LAN port a wireless Lan port), or power supply terminals for supplying power to the portable terminal.

The interface 127 may be a card socket that accepts an external card such as a subscriber identification module (SIM) or a user identity module (UIM), a memory card for information storage, and the like.

2 is a rear perspective view of the portable terminal of FIG.

Referring to FIG. 2, the second image input unit 116 of the first body 120 may be additionally mounted.

The second image input unit 116 may have a photographing direction substantially opposite to that of the first image input unit 115 (see FIG. 1), and may be a camera having different pixels from the first image input unit 115.

For example, the first image input unit 115 has low pixels so that it is easy to capture a face of a user in the case of a video call or the like and transmit the face to the other party, and the second image input unit 116 photographs a general object, It is preferable to have a high pixel because it is often not transmitted.

If the second image input unit 116 is not separately provided, the first image input unit 115 may be rotatable so that the second image input unit 128 can be photographed up to the photographing direction.

The second sound output unit 128 may be additionally disposed in the rear case 122 of the second body 120. [ The second sound output unit 128 may implement a stereo function together with the first sound output unit 114 (see FIG. 1), and may be used for talking in a speakerphone mode.

At least one of the first and second bodies 110 and 120 may be provided with light intensity sensors 151 and 152 for sensing the brightness of light. The illuminance sensor senses the illuminance around the terminal and uses it to adjust the brightness of the display unit, the brightness of the second and third operating units 123 and 124, and the like.

The illuminance sensors 151 and 152 include a first illuminance sensor 151 mounted on the rear case 112 of the first body 110 and a second illuminance sensor 151 mounted on the rear case 122 of the second body 120. [ 152). The illuminance sensors 151 and 152 are always exposed to the outside regardless of the open and closed states of the terminal, and they can be operated in association with the solar cell described later.

A power supply unit 129 (see FIG. 10) for supplying power to the portable terminal is mounted on the rear case 122 side. The power supply 129 may be detachably coupled, for example, for charging, as a rechargeable battery, for example. According to the present embodiment, the rear case 122 is detachably mounted with a battery cover 129a for covering the battery.

Meanwhile, the portable terminal of the present invention includes a solar cell for converting light energy into electric energy. A solar cell is a semiconductor device that converts light energy into electrical energy using a photoelectric effect. The solar cell can be classified into a silicon solar cell and a compound semiconductor solar cell, all of which are applicable to the present invention.

The Dean portable terminal according to the present invention has a plurality of solar cells at a plurality of locations. For example, as shown in FIG. 2, a first solar cell 131 is provided in the first body 110, and a second solar cell 132 is provided in the second body 120.

3 is a side view of a portable terminal according to an embodiment of the present invention.

As shown in FIG. 3, the first and second solar cells 131 and 132 are mounted on different surfaces of the terminal bodies 110 and 120, that is, the first and second surfaces S1 and S2. The first and second surfaces S1 and S2 may be opposite to each other and the first and second solar cells 131 and 132 are always exposed to the outside regardless of the open and closed states of the portable terminal, It is exposed to ambient light.

As described above, the first and second illuminance sensors 151 and 152 may be mounted on the first surface S1 and the second surface S2, respectively.

Although the outer surfaces of the first and second bodies 110 and 120 are illustrated as examples of the first and second surfaces S1 and S2 in the present embodiment, the present invention is not limited thereto, May correspond to the first and second surfaces S1 and S2, respectively. For example, when the portable terminal is formed into a bar type, the front surface and the rear surface of the portable terminal may correspond to the first surface S1 and the second surface S2, respectively.

The first and second solar cells 131 and 132 generate electrical energy using the incident light energy, and the electrical energy can be used to charge the battery 129 (power supply unit). According to the present invention, since the mounting positions of the first and second solar cells 131 and 132 are different from each other, the amount of incident light energy may be different depending on the position where the terminal is placed and the attitude of the terminal. In this case, the amount of electric energy generated by the first and second solar cells 131 and 132, for example, the amount of electric current is different from each other.

4 is a block diagram showing a configuration related to battery charging using the first and second solar cells.

Referring to FIG. 4, a charging unit 133 is connected to the first and second solar cells 131 and 132, and a charging unit 133 is connected to the battery 129. The charging unit 133 supplies the current generated in the first and second solar cells 131 and 132 to the battery 129 to charge the battery 129.

The first line 134 is connected to the first solar cell 131 and the second line 135 is connected to the second solar cell 132. The first and second lines 134 and 135 are grouped at a specific aggregation location for unification of the lines for supplying current to the charging unit 133. The first and second lines 134 and 135 are assembled at the collective position and connected to the charging unit 133 as a single line 136.

If the amounts of current generated by the first and second solar cells 131 and 132 are different from each other, a current having a different amount of current flows through the first and second lines 134 and 135. Accordingly, there is a possibility that the current flowing through any one of the first and second lines 134 and 135 flows back to the other and flows backward. The reverse current may adversely affect the operation of the first and second solar cells 131 and 132.

The present invention includes a control unit 170 (see FIG. 10) that equally matches the amounts of current supplied to the first and second lines 134 and 135 supplied to the collective position under specific conditions in order to prevent such a possibility.

Hereinafter, the amount of current generated in the first solar cell 131 will be referred to as a 'first amount of current', and the amount of current generated in the second solar cell 132 will be referred to as a 'second amount of current' .

The mobile terminal may include a current monitor for measuring the first and second current amounts. The current monitor is connected to the first and second solar cells 131 and 132, measures the first and second current amounts, and applies them to the control unit 170. [

The controller 170 controls the amount of current supplied to the first and second lines 134 and 135 to the collective position based on the first and second amounts of current.

The first and second illuminance sensors 151 and 152 may be used instead of the current monitor for the measurement of the first and second amounts of current. If the ambient brightness of the first surface S1 is brighter than the second surface S2, the light energy incident on the first surface S1 will be greater than the second surface S2. That is, the amount of current generated in the first and second solar cells 131 and 132 can be detected using the fact that the illuminance is proportional to the current generation amount of the solar cells 131 and 132. The relative relationship or ratio between the ambient illuminance and the solar energy is calculated in advance and stored in the memory 174 and the control unit 170 uses the sensing values of the illuminance sensors 151 and 152 and the information to calculate the relative relationship or ratio between the first and second solar cells 131 and 132 Can be detected.

The first and second lines 134 and 135 may further include first and second switching units 141 and 142 for opening and closing the first and second lines 134 and 135, respectively. The controller 170 selectively opens and closes the first and second switching units 141 and 142 so that only the current flowing through the first and second lines is supplied to the charging unit 133. [

In addition, the first and second switching units 141 and 142 may be configured to prevent current from flowing back toward the first and second solar cells 131 and 132 at the collecting position. This is to prevent the current from flowing back even when the control unit 170 does not match. The first and second switching units 141 and 142 may be implemented in various forms such as a diode and a field effect transistor (FET).

5 to 7 are block diagrams illustrating operating states of the portable terminal according to an embodiment of the present invention.

5 shows a case where the amount of current generated in the first and second solar cells 131 and 132 is the same. FIG. 5 illustrates the case where the first and second current amounts are respectively 50 mA.

In this way, when the amount of current generated in the first and second solar cells 131 and 132 is the same, it is not necessary to match the amount of current flowing through the first and second lines 134 and 135. The same amount of current flows in the first and second lines 134 and 135, and there is no possibility of current reverse flow. Therefore, in this case, the controller 170 does not perform the matching operation.

On the other hand, FIG. 6 shows a case where the controller 170 performs a matching operation. The controller 170 performs a matching operation under a specific condition in order to maximize the amount of current supplied from the first and second lines 134 and 135, that is, the sum of the first and second amounts of current.

Such a specific condition may be a condition that, under the condition that the first and second current amounts are different, a larger current amount in the first and second current amounts becomes smaller than a value twice as small as the small current amount. If this condition is satisfied, the controller 170 matches the amounts of the currents of the first and second lines 134 and 135 supplied to the collective position to a smaller one of the first and second amounts of current.

6 illustrates a case where the first current amount is 60 mA and the second current amount is 40 mA. Since the first and second current amounts are different from each other and the large current amount of 60 mA, which is one of the first and second current amounts, is smaller than twice the small current amount of 40 mA (80 mA), the first and second current amounts satisfy the above- . Accordingly, the controller 170 performs a matching operation, and the controller 170 controls the first and second lines 134 and 135 so that the current amounts of the first and second lines 134 and 135 are matched to 40 mA, Thereby controlling the batteries 131 and 132.

By the matching operation as described above, 80 mA, which is the sum of the amounts of current supplied to the collective position, is supplied to the charging unit 133. As a result, the reverse current of the current can be prevented in advance, and the maximum amount of current can be supplied to the charging unit 133.

Fig. 7 shows a case in which any one of the first and second switching units is selectively turned off.

If the first and second amounts of current are different from each other, the controller 170 may turn off the first and second switching units 141 and 142 if the first and second amounts of current do not satisfy the specific conditions. That is, the controller 170 selectively turns off the first and second switching units 141 and 142 so that the first and second lines 134 and 135 are selectively opened.

FIG. 7 illustrates a case where the first amount of current is 80 mA and the second amount of current is 20 mA. Since the first and second current amounts are different from each other and 80 mA which is a large current amount in the first and second current amounts is larger than 2 times (40 mA) of 20 mA which is a small current amount, the first and second amounts of current do not satisfy the above condition .

Accordingly, the controller 170 controls the second switching unit 142 to be turned off so as to open the second line 135 through which the small current flows among the first and second current amounts. Therefore, only 80 mA flowing through the first line is supplied to the charging unit 133.

The present invention matches the currents of the first and second lines 134 and 135 according to a specific condition and selectively turns off the first and second switching units 141 and 142 when the condition is exceeded, So that the maximum current is supplied to the battery.

On the other hand, the controller 170 can turn off any one of the first and second switching units 141 and 142 even when any one of the first and second solar cells 131 and 132 does not generate electrical energy. For example, when the second surface S2 of the terminal contacts the bottom (ground) and no current is generated in the second solar cell 132, the control unit turns off the second switching unit 142 to turn on the second line 135 are opened. Accordingly, only the current generated by the first solar cell 131 is supplied to the charging unit 133.

Fig. 8 is a view schematically showing a configuration of a battery, and Fig. 9 is a view for explaining the operation of a matching unit.

The battery 129 may include a plurality of battery cells 129a, 129b, and 129c. The battery cells 129a, 129b, and 129c may be connected to the charging unit 133 in parallel.

These battery cells 129a, 129b, and 129c have finely different resistance values, and impedance matching is required to charge them with the same power. Therefore, the matching units 161a, 161b, and 161c for impedance matching are connected to the battery cells 129a, 129b, and 129c.

The impedance matching may be performed by connecting a variable resistor to the battery cells 129a, 129b, and 129c. However, the present invention is not limited to this, 161a, 161b, and 161c to minimize power loss.

Fig. 9 shows the concept of the amount of current adjustment through the pulse width modulation method. The control unit 170 may control the matching units 161a, 161b, and 161c to repeatedly generate the pulse signal as shown in FIG.

In FIG. 9, the period of the pulse signal is denoted by 'T', and the pulse width is denoted by 'W'. The ratio of the pulse width W to the period T can be referred to as a duty ratio.

The control unit 170 applies information on the resistance values of the battery cells 129a, 129b and 129c to the matching units 161a, 161b and 161c, and the matching units 161a, 161b and 161c are different from each other So that a pulse signal having a duty ratio is generated. The matching units 161a, 161b, and 161c are configured to repeatedly open and connect the lines corresponding to the duty ratio, whereby a current amount proportional to the duty ratio can be supplied to the battery cells 129a, 129b, and 129c .

For example, when the amount of current output from the charging unit 133 is 100 mA and the duty ratios of the matching units 161a, 161b, and 161c in FIG. 8 are 70% and 80%, respectively. 90%, the amounts of current supplied to the battery cells 129a, 129b, 129c are 70mA, 80mA, and 90mA, respectively.

As described above, the power loss can be minimized by performing the impedance matching of the battery cells 129a, 129b, and 129c using the pulse width modulation method.

Although the first and second solar cells 131 and 132 are applied to a portable terminal having a folder type as described above, the first and second solar cells 131 and 132 may be mounted on different surfaces of various types of terminals such as a bar type, a slide type, 2 It is also possible to apply a solar cell, and all of the concepts described above can be applied here.

10 is a block diagram of a portable terminal according to the present invention.

10, a portable terminal according to an exemplary embodiment of the present invention includes a wireless communication module 171, operation units 123, 124 and 125, image input units 115 and 116, an acoustic input unit 126, a display unit 113, A sensing unit 176, an interface 127, a broadcast receiving module 175, a memory 174, a power supply unit 129, and a control unit 170. [

The control unit 170 typically controls the overall operation of the portable terminal. For example, for voice call, data communication, video call, and the like.

In the present invention, when the amounts of current generated in the first and second solar cells 131 and 132 are different from each other, the controller 170 equally matches the amounts of current in the first and second lines 134 and 135 under specific conditions.

The wireless communication module 171 transmits / receives wireless signals to / from the mobile communication base station through an antenna. A transmission unit 173 for transmitting and receiving voice data, character data, video data, and control data under the control of the control unit 170 and for modulating and transmitting a signal to be transmitted for this purpose; 172).

The operation units 123, 124, and 125 are configured as shown in FIG. 1, and provide the control unit 160 with key input data that the user inputs for controlling the operation of the terminal. The operation units 123, 124, and 125 include a dome switch, a touch pad (static / static), a jog wheel, a jog switch, and the like.

The image input units 115 and 116 process image frames such as still images or moving images obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame is converted into image data that can be displayed on the display unit 113 and output to the display unit 113.

The image frames processed by the image input units 115 and 116 are stored in the memory 174 under the control of the control unit 170 or transmitted to the outside through the wireless communication module 171. [

The sound input unit 126 receives an external sound signal by a microphone in a communication mode, a recording mode, a voice recognition mode, and the like, and processes it as electrical voice data. The processed voice data is converted into a form that can be transmitted to the mobile communication base station through the wireless communication module 171 in the communication mode, and is output to the wireless communication module. In the case of the recording mode, the processed voice data is output to be stored in the memory 174.

The sound input unit 126 may be implemented with various noise reduction algorithms for eliminating noise generated in the process of receiving an external sound signal.

The display unit 113 displays and outputs information processed in the portable terminal. For example, when the portable terminal is in the call mode, the control unit 170 displays a UI (User Interface) or GUI (Graphic User Interface) related to the call. When the portable terminal is in the video communication mode or the photographing mode, the control unit 170 displays and displays the photographed image, the UI, and the GUI. When the display unit 113 includes a touch screen, the display unit 113 is used as an input device in addition to the output device.

The sound output units 114 and 128 receive sound data received from the wireless communication module 161 under the control of the controller 170 in a call signal reception mode, a communication mode or a recording mode, a voice recognition mode, Converts the stored sound data and outputs it to the outside.

In addition, the sound output units 114 and 128 output sound signals related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the portable terminal. These sound output units 114 and 128 include a speaker, a receiver, a buzzer, and the like.

The sensing unit 176 senses the current state of the portable terminal, such as the opening / closing state of the portable terminal, the position of the portable terminal, whether or not the user touches the portable terminal, and generates a sensing signal for controlling the operation of the portable terminal. For example, it senses whether the portable terminal is in the folded state or the unfolded state, and outputs the sensing result to the controller 170 so that the operation of the terminal is controlled. And a sensing function related to whether or not the power supply unit 129 is powered on, whether the interface 126 is coupled to an external device, and the like.

The interface 127 may be any type of interface card such as a wired / wireless headset, an external charger, a wired / wireless data port, a card socket (for example, a memory card, a SIM / UIM card) It serves as an interface with the device. The interface 127 receives data from an external device or receives power from the external device, transfers the data to each component in the portable terminal, or transmits data in the portable terminal to an external device.

The memory 174 may store a program for processing and controlling the controller 170 and may have a function for temporarily storing input / output data (e.g., a phone book, a message, a still image, .

A program for controlling the operation of the portable terminal related to the present invention is stored in the memory 174

Such memory 174 includes the concept of a generally known hard disk, card type memory (e.g., SD or XD memory), flash memory, RAM, ROM, and the like.

The broadcast receiving module 175 receives broadcast signals transmitted through satellite or terrestrial waves and converts the broadcast signals into broadcast data formats that can be output to the sound output units 114 and 128 and the display unit 113 and outputs the converted broadcast data formats to the controller 170. Further, the broadcast receiving module 165 receives additional data (e.g., EPG (Electric Program Guide), channel list, etc.) related to broadcasting. The broadcast data and the additional data converted by the broadcast receiving module 175 may be stored in the memory 164.

The power supply unit 129 receives external power and internal power under the control of the controller 170 and supplies power necessary for operation of the respective components.

The above-described portable terminal is not limited to the configuration and method of the embodiments described above, but all or some of the embodiments may be selectively combined so that various modifications may be made to the embodiments.

1 is a front perspective view of a mobile terminal according to an embodiment of the present invention;

2 is a rear perspective view of a portable terminal according to an embodiment of the present invention;

3 is a perspective view of a portable terminal showing a battery cover separated;

4 is a cross-sectional view of the portable terminal according to line IV-IV in FIG. 3;

5 is a conceptual diagram showing a control method of a display according to an embodiment of the present invention;

6 is a flowchart showing a method of controlling brightness of a display unit according to the present invention;

7 is a conceptual diagram showing a control method of a display unit according to another embodiment of the present invention.

8 and 9 are perspective views illustrating a portable terminal according to another embodiment of the present invention.

10 is a block diagram of a mobile terminal according to an embodiment of the present invention.

Claims (13)

A terminal body having first and second surfaces different from each other and having a battery; First and second solar cells mounted on the first and second surfaces, respectively, for converting light energy into electrical energy; A charging unit for charging the battery, wherein the first and second lines respectively connected to the first and second solar cells are collected at a collective position and connected to a single line; And And a controller for equally matching amounts of currents of the first and second lines supplied to the collective position under specific conditions when the amounts of current generated in the first and second solar cells are different from each other. The method according to claim 1, Further comprising a current monitor for measuring first and second current amounts respectively generated in the first and second solar cells. 3. The method of claim 2, Wherein the controller matches the amounts of current supplied to the collective position to a smaller value of the first and second amounts of current. 3. The method of claim 2, Wherein the specific condition is a condition that a larger amount of current in the first and second amounts of current is smaller than a value twice the amount of current. The method according to claim 1, Further comprising first and second switching units mounted on the first and second lines, respectively, for opening and closing the first and second lines, respectively. 6. The method of claim 5, Wherein the controller turns off any one of the first and second switching units when the amounts of current do not satisfy the specific condition. 6. The method of claim 5, Wherein the control unit turns off any one of the first and second switching units when any one of the first and second solar cells does not generate electrical energy. 6. The method of claim 5, Wherein the first and second switching units are configured to prevent current from flowing backward from the collective position toward the first and second solar cells. The method according to claim 1, Further comprising first and second illuminance sensors mounted on the first and second surfaces, respectively, for sensing brightness of light. 10. The method of claim 9, Wherein the controller detects amounts of currents generated in the first and second solar cells based on the sensed values of the first and second illuminance sensors. The method according to claim 1, Wherein the battery comprises a plurality of battery cells connected in parallel to the charging unit, And a matching unit for impedance matching of the battery cells is connected to the battery cells. 12. The method of claim 11, Wherein the matching unit adjusts an amount of current supplied to the battery cells through a pulse width modulation method. The method according to claim 1, The terminal body includes first and second bodies connected to each other to be movable relative to each other, Wherein the first and second surfaces are provided on the first and second bodies, respectively.

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