KR100702953B1 - Apparatus for charging battery in mobile device using charger for cellular phone and a mobile device using the apparatus - Google Patents

Abstract

An apparatus according to the present invention is a device for charging a battery in a mobile device using a mobile phone charger having a connector having a battery ID pin for determining the type of the battery connected and a power supply pin for supplying charging power to the battery It includes a battery connection terminal unit, a charger connection terminal unit, and whether to charge or not. The battery connection terminal portion is connected to the terminals of the battery in the portable device. The charger connection terminal is connected to the connector of the mobile phone charger. The charge determining unit may cause a predetermined resistance to be sensed by the mobile phone charger through the battery ID pin if the voltage of the battery connected to the battery connection terminal is higher than a predetermined reference voltage. Otherwise, the predetermined resistance may not be detected by the mobile phone charger through the battery ID pin. do.

Digital Cameras, Rechargeable Batteries, Chargers, Mobile Devices

Description

Apparatus for charging battery in mobile device using charger for cellular phone and a mobile device using the apparatus}

1 is a perspective view showing a front side appearance of a digital camera as a portable device according to the present invention.

2 is a rear view illustrating a rear side appearance of the digital camera of FIG. 1.

3 is a diagram illustrating the overall configuration of the digital camera of FIG. 1.

4 is a circuit diagram showing an example of a battery charging device in a portable device of the present invention.

5 is a circuit diagram showing an improved example of a battery charging device in a portable device of the present invention.

FIG. 6 is a diagram illustrating a case where a secondary battery is connected to the battery charging device of the portable device of FIG. 5.

FIG. 7 is a diagram illustrating a case where a primary battery is connected to the battery charging device of the portable device of FIG. 5.

 <Explanation of symbols for the main parts of the drawings>

1 ... digital camera, 11 ... self-timer lamp,

12 ... flash, 13 ... shutter release button,

14 ... mode dial, 15 ... function buttons,

15 _R ... self-timer / right button, 15 _L ... flash / left button,

15 _D ... macro / down button, 15 _U ... voice-note / up button,

15 _M ... Menu / Select-OK button, 17a, 17b ...

19 ... flash-light sensor, 20 ... lens section,

21 External interface, MIC microphone,

SP ... speakers, 31 ... power button,

32 monitor button, 33 auto-focus lamp,

34 ... flash standby lamp, 35 ... color LCD panel,

36 ... Manual-Focusing / Delete button, 37 ... Manual-Adjusting / Play / Stop button,

39 _W ... wide-zoom button, 39 _T ... tele-zoom button,

OPS ... optical system, OEC ... photoelectric conversion unit,

M _Z ... zoom motor, M _F ... focus motor,

M _A ... aperture motor, 100 ... battery connection terminal,

101 ... cathode terminal, 102 ... ID electrode terminal,

103 ... positive terminal, 200 ... charger connection terminal,

201 ... battery ID pin connector, 202 ... power supply terminal,

300 power supply circuit, 310 charging unit,

311 ... battery discriminating part, 312 ... switch part

501 analog-to-digital converter, 502 timing circuit,

503 ... real-time clock, 504 ... DRAM, 505 ... EEPROM, 506 ... memory card interface,

507 ... digital camera processor, 508 ... RS232C interface,

509 video filter, 510 lens drive,

511 ... flash controller, 512 ... microcontroller,

INP ... user input, LAMP ... light emitter,

513 audio processor, 514 LCD driver,

600 ... rechargeable battery, 601 ... cathode,

602 ID electrode, 603 anode,

700 ... primary battery 701 ... cathode

703 ... anode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery charging apparatus in a portable device, and more particularly, to an apparatus capable of charging a secondary battery in a portable device using a mobile phone charger that is standardized and supplied.

The existing portable devices, especially digital cameras, are designed to be used as a power source for the convenience of consumers, and to use both a primary battery for a single use and a secondary battery that can be recharged and reused. The charging of the battery is made by using a charger according to its own standard for each digital camera manufacturer, so it is not compatible with other camera manufacturers. In particular, the compatibility of the charger used when charging with a secondary battery in the camera is It was more lacking. In addition, there is a mobile phone charger for a mobile phone using a secondary battery, but can not be used to charge the camera had to have both a mobile phone charger and a camera charger.

SUMMARY OF THE INVENTION An object of the present invention is to provide a battery charging device in a portable device and a camera employing the same so that a secondary battery in a portable device can be charged using a mobile phone charger so that a charger for the portable device does not need to be independently provided. To provide.

It is also an object of the present invention to provide a battery charging device in a portable device and a portable device employing the same so that charging is not performed when the primary battery is mounted in the portable device when the battery in the portable device is charged using the mobile phone charger. To provide.

An apparatus of the present invention for achieving the above object is a battery in a portable device using a mobile phone charger having a connector having a battery ID pin for determining the type of connected battery and a power supply pin for supplying charging power to the battery. As a device for charging, it includes a battery connection terminal unit, a charger connection terminal unit, the charge determining unit. The battery connection terminal unit is connected to terminals of a battery in a portable device. The charger connection terminal unit is connected to the connector of the mobile phone charger. The charge determining unit determines whether a predetermined resistance is detected by the mobile phone charger through the battery ID pin when the voltage of the battery connected to the battery connection terminal is higher than a predetermined reference voltage. Do not detect.

According to the apparatus of the present invention, the charge determining unit may include a battery discriminating unit for discriminating a secondary battery if the voltage of the battery connected to the battery connection terminal unit is higher than a predetermined reference voltage or a primary battery and outputting a discrimination signal; A switch for receiving the output of the battery discriminating unit to ground the other terminal of the resistor connected to one terminal to the battery ID pin if the secondary battery, and to open the other terminal of the resistor connected to one terminal to the battery ID pin if the primary battery Contains wealth.

According to the apparatus of the present invention, the battery connection terminal portion includes an ID electrode terminal for connecting with an ID electrode of a secondary battery, and the ID electrode terminal further includes the other terminal of the resistor in which one terminal is connected to the battery ID pin. Is connected to.

The portable device of the present invention for achieving the above object employs the device of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail.

Referring to Fig. 1, in front of a digital camera 1 as a portable device according to the present invention, a microphone MIC, a self-timer lamp 11, a flash 12, a shutter release button 13 are provided. , View finder 17a, flash-light sensor 19, power switch 31, lens unit 20, and remote receiver 41. In addition, there is provided a charger connection terminal 200 that is directly related to the features of the present application will be described in detail with respect to FIGS.

In the self-timer mode, the self-timer lamp 11 operates for a set time from the time when the shutter release button 13 is pressed to the time at which the image starts to be captured. The flash-light amount sensor 19 detects the light amount when the flash 12 operates and inputs the light amount to the digital camera processor 507 of FIG. 3 through the microcontroller 512 of FIG. 3.

The remote receiver 41 receives an infrared photographing command signal from a remote controller (not shown) and inputs it to the digital camera processor 507 through the microcontroller 512.

The shutter release button 13 has a two-stage structure. That is, after the user operates the wide-angle zoom button 39 _W and the tele-zoom button 39 _T , the S1 signal from the shutter release button 13 is turned on by pressing the shutter release button 13 only one step. And the S2 signal from the shutter release button 13 is turned on when pressed to the second stage.

Referring to FIG. 2, the rear of the digital camera 1 according to the present invention has a mode dial 14, function buttons 15, a manual-focusing / deleting button 36, a manual-adjusting / playback button 37. , Playback mode button 42, speaker (SP), monitor button 32, auto-focus lamp 33, view finder 17b, flash standby lamp 34, color LCD panel 35, wide angle ( There is a wide angle-zoom button 39 _W , a telephoto-zoom button 39 _T , and an external interface 21.

The mode dial 14 is a camera's operation modes, for example, a composite shooting mode (14 _ML ), a program shooting mode, a portrait shooting mode, a night view shooting mode, a manual shooting mode, a video shooting mode (14 _MP ), user setting the mode (14 _MY), and the recording mode (14 _V) is used for the user to select and set.

Here, the composite photographing mode 14 _ML indicates an operation mode in which an input image and any one auxiliary image are synthesized and photographed. The user setting mode 14 _MY indicates an operation mode for setting shooting information required for the still image or moving picture shooting mode by the user. On the other hand, the recording mode (14 _V) is sound, for example, refers to a mode of operation for simply recording only the user's voice.

The function buttons 15 are used by the user to perform specific functions of the digital camera 1 while being used as direction-shift buttons and the like of the activation cursor in the menu screen of the color LCD panel 35.

For example, the user and the macro / down in a still image or a moving picture pick-up mode is close automatic focusing by pressing a shift button (15 _P) is set. In addition, the user menu / selection from the menu, the display form for setting the condition of any one of the operation mode by the OK button (15 _M) in the pressing, the user and the macro / down-pressing the change button (15 _P) activated The cursor moves down.

On the other hand, when the user voice-notes / up-press the navigation button (15 _R), can be recorded for 10 seconds after the subsequent image sensing operation. In addition, the user the menu / selection from the menu, the display form for setting the condition of any one of the operation mode by the OK button (15 _M) in the press, when the user voice-notes / up-shift button (15 _R) Press to move the active cursor up. In addition, the active cursor is user menu / selection in a state located in any one of the selection - Press the OK button (15 _M) the operation corresponding to the selected item is performed.

The manual focusing / deletion button 36 is used to manually focus or delete operation by the user in the shooting mode. The manual-adjustment / playback button 37 is used for the manual adjustment of certain conditions and for functions such as stopping or playing in the playback mode. The playback mode button 42 is used for switching to the playback or preview mode.

The monitor button 32 is used by the user to control the operation of the color LCD panel 35. For example, in the shooting mode, when the user presses the monitor button 32 firstly, the image of the subject and the shooting information thereof are displayed on the color LCD panel 35, and when the user presses the monitor button 32 first, power applied to the color LCD panel 35 is pressed. Is blocked. In addition, in the playback mode, when the user presses the monitor button 32 first while the image file is being played back, the shooting information of the video file being played is displayed on the color LCD panel 35, and when pressed second, Only the image is displayed.

The auto-focus lamp 33 operates when the focus is achieved. The flash standby lamp 34 operates when the flash (12 in FIG. 1) is in standby for operation. Mode refers to the selection mode of the indicator lamps (14 _L), a mode dial 14.

3 shows the overall configuration of the digital camera 1 of FIG. Referring to Figures 1 to 3, the overall configuration and operation of the digital camera 1 of Figure 1 will be described.

The optical system OPS including the lens unit and the filter unit optically processes light from a subject.

The lens unit of the optical system OPS includes a zoom lens, a focus lens, and a compensation lens.

When the user presses the wide angle-zoom button 39w or the telephoto-zoom button 39t included in the user input unit INP, a corresponding signal is input to the microcontroller 512. Accordingly, as the microcontroller 512 controls the lens driver 510, the zoom motor M _Z is driven to move the zoom lens. That is, when the wide-angle zoom button 39w is pressed, the focal length of the zoom lens is shortened to widen the angle of view, and when the telephoto-zoom button 39t is pressed, the focus of the zoom lens is pressed. The longer the length, the narrower the angle of view. Here, since the position of the focus lens is adjusted while the position of the zoom lens is set, the angle of view is hardly influenced by the position of the focus lens.

Meanwhile, in the auto focusing mode, the focus motor M _F is driven by the main controller embedded in the digital camera processor 507 controlling the driving unit 510 through the microcontroller 512. As a result, the focus lens is moved, and in this process, the position of the focus lens where the high frequency component of the image signal is the largest, for example, the number of driving steps of the focus motor M _F is set.

The compensating lens of the lens unit of the optical system OPS is not driven separately because it serves to compensate the overall refractive index. Reference numeral M _A denotes a motor for driving the iris.

In the filter section of the optical system OPS, an optical low pass filter (OLPF) removes optical noise of high frequency components. Infra-Red cut filters (IRFs) block infrared components of incident light.

A photoelectric conversion unit (OEC) of a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) converts light from an optical system (OPS) into an electrical analog signal. Here, the digital camera processor 507 controls the timing circuit 502 to control the operations of the photoelectric converter OEC and the analog-digital converter 501. The CDS-ADC (Correlation Double Sampler and Analog-to-Digital Converter) element 501 as an analog-to-digital converter processes the analog signal from the photoelectric converter (OEC), removes the high frequency noise, and adjusts the amplitude. After that, it is converted into a digital signal.

The real time clock 503 provides time information to the digital camera processor 507. The digital camera processor 507 processes the digital signal from the CDS-ADC element 501 to generate a digital video signal classified into luminance and chroma signals.

The light-emitting portion LAMP driven by the microcontroller 512 in accordance with control signals from the digital camera processor 507 incorporating the main controller includes a self-timer lamp 11, an auto-focus lamp 33, A mode indication lamp 14 _L and a flash standby lamp 34 are included. The user input unit INP includes a shutter release button 13, a mode dial 14, function buttons 15, a monitor button 32, a manual focusing / delete button 36, a manual adjustment / playback button ( 37), wide-zoom button 39 _W , telephoto-zoom button 39 _T , and the like.

A digital video signal from the digital camera processor 507 is temporarily stored in a DRAM (Dynamic Random Access Memory) 504. The EEPROM (Electrically Erasable and Programmable Read Only Memory) 505 stores algorithms necessary for the operation of the digital camera processor 507. In the memory card interface (MCI) 506, a user's memory card is detached. The flash memory FM stores setting data necessary for the operation of the digital camera processor 507. The setting data includes data of auxiliary images for composite shooting. In the memory card interface 506, a user's memory card is detached.

The digital image signal from the digital camera processor 507 is input to the LCD driver 514, whereby the image is displayed on the color LCD panel 35.

On the other hand, the digital video signal from the digital camera processor 507 can be transmitted by serial communication via the USB (Universal Serial Bus) connection 21a or the RS232C interface 508 and its connection 21b, and the video filter ( 509 and the video output unit 21c may be transmitted as a video signal.

The audio processor 513 outputs the audio signal from the microphone MIC to the digital camera processor 507 or the speaker SP, and outputs the audio signal from the digital camera processor 507 to the speaker SP.

On the other hand, the microcontroller 512 drives the flash 12 by controlling the operation of the flash controller 511 according to the signal from the flash-light amount sensor 19.

Power for the operation of the camera such as the digital camera 1 of FIG. 1 may be supplied by a battery (600 of FIG. 3) mounted in the camera. The power supplied from the battery 600 is supplied to each part requiring power inside the camera through the power supply circuit 300. The digital camera processor 507 determines whether the type of battery mounted in the battery chamber of the camera is a primary battery or a secondary battery through the power supply circuit 300, and the power supply circuit 300 may be supplied with proper power. To control. As the secondary battery, various types and capacities of secondary batteries including lithium ion batteries may be used.

Cell phone chargers are chargers used to charge cell phone batteries by plugging connectors into the cell phone's input and output terminals. Previously, the number of pins of connectors was different with 18- or 24-pin connectors for each cell phone manufacturer. It was not compatible because it was made in a separate standard such as different arrangement and purpose of use. For this reason, when replacing the mobile phone, there was an inconvenience such as the need to replace the charger. Therefore, in order to secure compatibility, the Telecommunication Technology Association (TTA), that is, the Korea Information and Communication Association has established a standard for 24-pin mobile phone chargers, and many mobile phone chargers manufactured according to the standard have been widely distributed not only in Korea but also abroad. . The TTA standard 24-pin charger is equipped with a 24-pin connector for pin assignment and pin usage according to the TTA standard, and the charger can determine the appropriate charging current according to the battery of various types and capacities.

The table below shows pin numbers related to the charging of the TTA standard 24-pin travel mobile phone charger, the signal names of the mobile phone input / output terminals and the functions of the pins.

Pin number Signal name Pin function One Battery ID For 27 KΩ: 450 mA For 4.7 KΩ: 750 mA For 1.5 KΩ: 900 mA (optional) * Allowable charge current deviation: ± 50 mA * The ID resistance value must be recognizable as one of the above values for charging. * When not outputting 900 mA, recognize 1.5 KΩ but allow 750 mA output. 21, 22 POWER (+ 4.2V) / SWB + Charging circuit external terminal power supply 4, 5 POWER (+5 ~ 5.5V) Power supply terminal with built-in charging circuit 12, 19 POWER GROUND Power ground

Pin 1 of the TTA standard 24-pin charger is called a battery ID pin, which determines the type and capacity of a secondary battery used in a mobile phone so that charging can be performed with an appropriate charging current. The secondary battery for mobile phones is equipped with ID electrodes in addition to the positive and negative electrodes used to supply power to the mobile phone and to receive the charging power. The internal value of the secondary battery is different depending on the type or capacity of the secondary battery. The resistor is connected. The charger reads this internal resistance connected to the battery ID pin to determine how much charging current to charge the secondary battery. As can be seen from the table, when this internal resistance is 27 KΩ, it supplies 450 mA of charging current, and when 4.7 KΩ, it supplies 750 mA of charging current. Supplying is optional. Pins 21 and 22 are used to supply power to a mobile phone terminal with an external charging circuit. Pins 4 and 5 are used to supply power to a mobile phone terminal with an internal charging circuit. Pins 12 and 19 are for power grounding.

In the mobile phone charger of the TTA standard as described above, the charging current does not flow when a resistance connected to the battery ID pin is not sensed, but the charging current does not flow when a resistance different from the prescribed resistance is connected to the battery ID pin and sensed. It does not mean that even a small amount of current will flow.

On the other hand, in a mobile phone, a secondary battery is commonly used, whereas in the case of a camera such as the digital camera 1, it is common to use both a primary battery and a secondary battery. Unlike the rechargeable battery that can perform charging and discharging, the primary battery that has reached the end of its life with a single discharge can cause the camera to break down due to leakage or damage inside the cell. If the primary battery is mounted, no charging current shall be supplied.

Primary and secondary batteries used in digital cameras have different driving voltage ranges. The primary battery has a driving voltage range of 1.8-3.2 V, and the secondary battery has a driving voltage range of 3.3-4.2 V. That is, the primary battery can produce a maximum voltage of 3.2 V, the secondary battery can produce a maximum voltage of 4.2 V, and the digital camera processor 507 determines that the primary battery has a voltage of 1.8 V or less, or If it is determined that the voltage of the secondary battery is 3.3 V or less, the process proceeds to the digital camera termination sequence provided to prevent the camera failure due to a sudden termination due to the lack of power. Therefore, for example, when the voltage of the battery is greater than the maximum voltage of the primary battery 3.2V, it will be determined to charge as a secondary battery, otherwise it will be possible to judge it as a primary battery and not charge. An example of an in-camera battery charging device of the present invention configured is shown in FIG. 4.

Referring to FIG. 4, the apparatus for charging a battery in a camera of the present invention includes a battery connection terminal unit 100, a charger connection terminal unit 200, and a charge determining unit 310. The battery connection terminal unit 100 is connected to terminals of batteries in the camera. The battery connection terminal unit 100 is a negative electrode terminal 101 connected to the negative electrode of the battery (601 of FIG. 6, 701 of Figure 7), the positive electrode connected to the positive electrode of the battery (603 of Figure 6, 703 of Figure 7) It consists of the terminal 103. The charger connection terminal unit 200 is connected to a connector (not shown) of the charger. The charger connection terminal unit 200 includes a battery ID pin connection terminal 201 connected to a battery ID pin (not shown) of the connector and a power supply terminal 202 connected to a power terminal of the charger connector. For reference, when using the TTA standard 24-pin charger, the terminal 102 for the ID electrode is connected to pin 1 of the charger, and the power supply terminal 202 is connected to the power supply pins 21 and 22 pins of the charger. If the voltage of the battery (600 of FIG. 6 and 700 of FIG. 7) connected to the battery connection terminal unit 100 is higher than a predetermined reference voltage, the charge determining unit 310 determines that the predetermined resistance R3 is the battery ID pin connecting terminal. The battery ID pin connected to 201 is sensed by the mobile phone charger, otherwise the resistor R3 is not sensed by the mobile phone charger via the battery ID pin.

The predetermined reference voltage is a value larger than 3.2 V, the maximum voltage of the primary battery, and smaller than 3.3 V, the minimum voltage of the driving voltage range of the secondary battery, when the driving voltage range is as described above. You can do it.

When the battery voltage, which is the potential difference between the positive terminal 103 and the negative terminal 101, is lower than the predetermined reference voltage, the charge determining unit 310 determines that the predetermined resistance R3 is transmitted through the battery ID pin of the charger. Any configuration that performs the function of being sensed by the charger, or not otherwise, is sufficient, and those skilled in the art will contemplate various configurations for the implementation of this function. One example is to include a battery discriminating unit 311 and a switch unit 312 as shown in FIG. The battery discriminating unit 311 outputs a discrimination signal by discriminating a secondary battery if the voltage of the battery connected to the battery connection terminal unit 100 is higher than a predetermined reference voltage (for example, 3.25 V) or a primary battery. In Fig. 4, the comparator is configured, and 3.25 V can be set as the reference voltage by appropriately selecting the values of Vref, R1, and R2. If the switch unit 312 receives the output of the battery determination unit 311 and is a secondary battery, that is, if the input number 3 of the battery determination unit 311 is larger than the input number 4, the switch unit 312 is turned on, and In this case, the switch unit 313 is turned off. In FIG. 4, the switch unit 312 is configured as an FET. When the voltage of the battery is higher than the reference voltage, the switch unit 312 receives a high signal from the battery discriminator 311 configured as a comparator, and the FET is turned on. The other terminal of resistor R3 is grounded. The charger then senses the resistor R3 through the battery ID pin and charges it with the appropriate current. If the voltage of the battery is not higher than the reference voltage, the high signal is not output from the battery determination unit 311 so that the FET is not turned on and the other terminal of the resistor R3 is opened. In this case, the charger does not detect the resistance connected to the battery ID pin and does not charge.

The value of the resistor (R3) can be set to an appropriate value in consideration of the capacity of the rechargeable battery to be used in the digital camera, and when using a charger of the TTA standard, one of 27 KΩ, 4.7 KΩ, 1.5 KΩ specified in the standard It is preferable to select.

One problem that can be expected in the in-camera battery charging device having the configuration as shown in FIG. 4 is the case of using a lithium ion secondary battery having a built-in protection circuit. Some of the lithium ion batteries have a protection circuit for the protection operation when the voltage falls to a low voltage below a certain value to drop the battery voltage to near 0V. In this case, the voltage of the secondary battery becomes lower than the reference voltage, and thus the secondary battery cannot be charged with the configuration corresponding to FIG. 4.

The present inventors used the ID electrode present in the secondary battery as a method to solve this problem. In the case of secondary batteries used in cameras, ID electrodes exist similarly to secondary batteries for mobile phones. A resistor or thermistor (Ri in Fig. 6) is provided internally between the ID electrode and the negative electrode of the camera secondary battery. For example, a secondary battery for UCA-3, Samsung Techwin's digital camera model, has a built-in thermistor of 10 KΩ instead of a resistor. As can be seen in Table 1, this resistance value is not a resistance value defined in the charger specification for mobile phones. However, the present invention provides the invention as shown in FIG. 5 by noticing that the resistance value is detected through the ID pin even if the resistance value is not specified in the charger for the mobile phone. do.

6 illustrates a case where a secondary battery is coupled to the apparatus of FIG. 5, and FIG. 7 illustrates a case where a primary battery is coupled to the apparatus of FIG. 5.

5 to 7, in addition to the apparatus of FIG. 4, the battery connection terminal unit 100 further includes an ID electrode terminal 102 connected to the ID electrode 602 of the secondary battery 600. The terminal 102 for the ID electrode is also connected to the other terminal of the resistor R3 having one terminal connected to the battery ID pin.

When a secondary battery that does not have a protection circuit and has a voltage higher than the reference voltage (for example, 3.25 V) in the apparatus of FIG. 4 is connected to the battery connection terminal unit 100, regardless of the presence of the internal resistance Ri of the battery The resistance of R3 is sensed and charged to the desired constant current. This is because the resistance of Ri is not sensed through the battery ID pin of the charger since the switch unit 311 connected in parallel with Ri is turned on.

On the other hand, when the secondary battery having a protection circuit and having a lower voltage than the reference voltage in the apparatus of FIG. 4 is connected to the battery connection terminal unit 100, the switch unit 311 is not turned on as in the case of FIG. 4. However, since the terminal 102 for the ID electrode is connected to the terminal opposite the battery ID pin of the resistor R3, the resistance of (R3 + Ri) is located between the battery ID pin and ground, so that the charger (R3 + Ri) will be detected. Considering that the value of R3 is determined as the resistance value according to the charger standard, the resistance of (R3 + Ri) will be different from that specified in the standard. However, even in this case, a small amount of current flows as described above, so that the secondary battery is charged, although not charged by the constant current specified in the standard. Then, after charging is performed such that the voltage of the secondary battery is higher than the reference voltage, the switch unit 312 is turned on so that only R3 is sensed, and the charging is rapidly performed at a constant current corresponding to the value.

If the secondary battery has not been used for a long time, the voltage may be lower than the reference voltage, but in this case, charging is possible as well.

Meanwhile, when the primary battery is connected to the battery connection terminal unit 100 as shown in FIG. 8, since there is no additional resistance connected through the ID electrode terminal 102, only the comparison with the reference voltage is performed in the same manner as in FIG. 4. Whether to charge is determined.

The mobile phone charger used for charging is preferably a TTA standard 24-pin charger, but has a battery ID pin, and any mobile phone charger capable of determining the internal resistance of the battery and supplying a charging current according to a predetermined internal resistance value is possible. Of course.

The charger connection terminal 200 connected to the connector of the mobile phone charger may be directly connected to the mobile phone charger connector 410, as well as a terminal connected to the charger connection terminal 200 and a terminal connected to the charger connector 410. It is also possible to be connected via a cradle provided.

In the above description, the present invention has been described with reference to a digital camera, which is a kind of portable device. However, it will be readily apparent to those skilled in the art that the present invention can be applied to all general portable devices powered by a battery.

As described above, according to the secondary battery charging device in the mobile device using the mobile phone charger and the mobile device employing the same according to the present invention, it is possible to use a standard mobile phone charger without having to provide a separate charger for the mobile device. It is possible to charge the secondary battery when the secondary battery is mounted in the portable device, and not to charge when the primary battery is mounted.

The present invention is not limited to the above embodiments, but may be modified and improved by those skilled in the art within the spirit and scope of the invention as defined in the claims.

Claims (6)

An apparatus for charging a battery in a mobile device using a mobile phone charger having a connector having a battery ID pin for determining the type of connected battery and a power supply pin for supplying charging power to the battery. A battery connection terminal unit connected to terminals of a battery in the portable device; A charger connection terminal unit connected to the connector of the mobile phone charger; And If a voltage of a battery connected to the battery connection terminal is higher than a predetermined reference voltage, a predetermined resistance is sensed by the mobile phone charger through the battery ID pin; otherwise, the resistance is not detected by the mobile phone charger through the battery ID pin. To determine whether or not to charge, The charge determining unit may include a battery determination unit configured to output a determination signal by discriminating a secondary battery or a primary battery when a voltage of a battery connected to the battery connection terminal unit is higher than the predetermined reference voltage; A switch for receiving the output of the battery discriminating unit to ground the other terminal of the resistor connected to one terminal to the battery ID pin if the secondary battery, and to open the other terminal of the resistor connected to one terminal to the battery ID pin if the primary battery Containing wealth, Battery charging device in a mobile device using a mobile phone charger. delete The battery terminal according to claim 1, wherein the battery connection terminal portion includes an ID electrode terminal for connecting with an ID electrode of a secondary battery, and the ID electrode terminal is further connected to the other terminal of the resistor in which one terminal is connected to the battery ID pin. Connected, Battery charging device in a mobile device using a mobile phone charger. The method of claim 1, wherein the mobile phone charger is characterized in that the TTA standard 24-pin charger, Battery charging device in camera using mobile phone charger. The method of claim 1, wherein the charger connection terminal portion connected to the mobile phone charger connector, characterized in that connected via a cradle outside the mobile device, Battery charging device in camera using mobile phone charger. A portable device employing the device of any one of claims 1 or 3 to 6.

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