KR100623864B1 - Portable terminal and method for controlling of backup battery charging - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a portable terminal having a backup power charging control function and a method thereof.

2. The technical problem to be solved by the invention

According to the present invention, the backup power supply means is controlled by turning on / off the power applied to the backup power supply means according to the charging state (voltage level) or the charging current level of the backup power supply means. It is an object of the present invention to provide a portable terminal having a backup power charging control function and a method thereof, which can reduce unnecessary current consumption in the present invention.

3. Summary of Solution to Invention

The present invention provides a portable terminal, comprising: power supply means for supplying power to an internal component of the portable terminal; Switching means turned on / off according to control of the backup power charging control means; Backup power applying means for applying power received from the power supply means through the switching means to backup power charging means; The backup power charging means charged with the power received from the backup power applying means; Current sensing means for sensing a charging current flowing in the backup power charging means; And the backup power charging control means for controlling whether the backup power charging means is charged according to the charging current level received from the current sensing means and the voltage level received from the backup power charging means.

4. Important uses of the invention

The present invention is used in portable terminals and the like.

Backup battery, real-time clock regulator (RTC_LDO), backup battery charge control, portable terminal

Description

Portable terminal having a backup power charging control function and its method {Portable terminal and method for controlling of backup battery charging}

1 is a diagram illustrating an embodiment of charging backup power in a conventional wireless communication terminal.

2 is a configuration diagram of an embodiment of a wireless communication terminal having a backup power charging control function according to the present invention;

3 is a flowchart illustrating a method for controlling backup power charging in a wireless communication terminal according to the present invention.

* Explanation of symbols for the main parts of the drawings

21: main battery 22: switch

23: real time clock_regulator 24: resistance

25: backup battery 26: backup battery charge control unit

261: voltage detector 262: analog switch

263: level shifter 264: amplifier

265: reference voltage generator 266: comparison and control

The present invention relates to a portable terminal having a backup power charging control function and a method thereof, and more particularly, to turn on the power applied to the backup power applying means according to the charging state (voltage level) or the charging current level of the backup power charging means. The present invention relates to a portable terminal having a backup power charging control function capable of reducing unnecessary current consumption in the backup power applying means by controlling the charging of the backup power charging means by turning on / off.

In the present invention, the portable terminal refers to a wireless communication terminal, a personal digital assistant (PDA), a portable computer (laptop), a portable multimedia player (PMP), and the like.

The wireless communication terminal is a mobile communication terminal, a personal digital communication terminal (PCS), a personal digital terminal (PDA), a smart phone, a next generation mobile communication terminal (IMT-2000), such as a wireless terminal while carrying a wireless communication Say possible terminal.

For example, a wireless communication terminal has various functions in addition to a call function, which is an original purpose, for example, a wireless communication terminal equipped with a digital camera, a wireless communication terminal having an MP3 (MP3) player function, and a GPS reception function. And a wireless communication terminal equipped with a. In addition, the popularity of wireless communication terminals has become very common, and various convenient functions are expected to be added because of the characteristics that an individual always carries.

In the following embodiment, a wireless communication terminal will be described as an example of a portable terminal.

In the present invention, the real-time clock regulator (RTC_LDO) is a regulator for applying power to a backup battery for driving a real time clock (Real Time Clock) that must always operate even when the power of the wireless communication terminal is turned off.

1 is a diagram illustrating an embodiment of charging backup power in a conventional wireless communication terminal.

As shown in FIG. 1, the conventional wireless communication terminal includes a main battery 101 for supplying power to each internal component of the wireless communication terminal, and backup power 103 using the power received from the main battery 101. A real time clock regulator (RTC_LDO Regulator) 102 for applying to the, and a backup battery 103 is charged with the current received from the real time clock regulator (102).

Currently, a backup battery applied to a wireless communication terminal is charged with a current applied from a real-time clock regulator. That is, when the main battery 101 is coupled, power is automatically supplied to the real-time clock_regulator (RTC_LDO) to charge the backup battery 103.

However, in the conventional wireless communication terminal, the main battery 101 and the real time clock regulator (RTC_LDO Regulator) 102 are directly connected, and the real time clock regulator 102 continuously outputs the V_RTC voltage. Therefore, even when the backup battery 103 is full, since the power is continuously supplied to the real-time clock_regulator (RTC_LDO), unnecessary current consumption occurs.

The present invention has been proposed to solve the above problems, and charges the backup power charging means by turning on / off power applied to the backup power applying means according to the charging state (voltage level) or the charging current level of the backup power charging means. It is an object of the present invention to provide a portable terminal having a backup power charging control function and a method thereof that can reduce unnecessary current consumption in the backup power applying means.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

An apparatus of the present invention for achieving the above object, the portable terminal, the power supply means for supplying power to the internal component of the portable terminal; Switching means turned on / off according to control of the backup power charging control means; Backup power applying means for applying power received from the power supply means through the switching means to backup power charging means; The backup power charging means charged with the power received from the backup power applying means; Current sensing means for sensing a charging current flowing in the backup power charging means; And the backup power charging control means for controlling whether the backup power charging means is charged according to the charging current level received from the current sensing means and the voltage level received from the backup power charging means.

On the other hand, the method of the present invention, the backup power charging control method in a portable terminal, comprising: determining whether the voltage level of the backup power charging means or the backup power charging current level conversion value exceeds the threshold voltage level; As a result of the determination step, the backup power charging for charging the backup power charging means by outputting a backup power charging control signal when the voltage level or backup power charging current level conversion value of the backup power charging means is less than a threshold voltage level. step; And outputting a backup power charging end control signal when the voltage level of the backup power charging means or the backup power charging current level conversion value is equal to or greater than a threshold voltage level, thereby terminating the charging of the backup power charging means. And a backup power discharge step of discharging.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram of an embodiment of a wireless communication terminal having a backup battery charge control function according to the present invention.

As shown in FIG. 2, the wireless communication terminal having the backup battery charge control function according to the present invention includes a main battery 21 and a backup battery charge control unit 26 for supplying power to internal components of the wireless communication terminal. Switch 22 that is turned on / off according to the backup battery charge control signal of the real time clock for applying power received from the main battery 21 through the switch 22 to the backup battery 25. The RTC (LDO Regulator) 23, the backup battery 25 is charged by the power received from the real-time clock regulator 22, the charge flowing between the real-time clock regulator 22 and the backup battery 25 Whether the backup battery 25 is charged or not depends on a resistor 24 for sensing current and a charge current level received from the resistor 24 and a voltage level received from the backup battery 25. And a backup battery wherein the charging control section 26 for outputting a back-up battery charge control signal or shut down the backup battery charge control signal to.

The switch 22 may be implemented as a general transistor that is turned on / off according to a backup battery charge control signal or a backup battery charge end control signal received from the backup battery charge control unit 26. .

The backup battery charge control unit 26 receives the backup battery charge control signal from the voltage detector 261, the comparison and control unit 266 for detecting the voltage level across the resistor 24. The voltage level of the backup battery 25 is transferred to the level shifter 263 and the backup battery charge end control signal is received from the comparison and control unit 266. 266, an analog switch 262 for transmitting to the level switch 263 (upper end of the resistor 24) for up-converting the voltage level detected by the voltage detector 261 received from the analog switch 262 Since the level of the applied voltage is too low), the reference voltage generator 265 for generating a reference voltage to be compared with the voltage received from the level shifter 263 and the voltage shifter 263 An amplifier 264 for outputting a voltage exceeding a threshold voltage level as the received voltage is below a reference voltage, from the voltage level or amplifier 264 received from the backup battery 25 via the analog switch 262; Compare the received voltage level with a predetermined threshold voltage level and output a backup battery charge control signal High or a backup battery charge end control signal Low corresponding to the switch 22 and the analog switch 262. For comparison and control 266.

That is, the analog switch 262 connects the voltage detector 261 and the level shifter 263 (A1 and B1 connection) in response to receiving the backup battery charge control signal from the comparison and control unit 266. In response to receiving the backup battery charge end control signal from the controller 266, the backup battery 25 and the comparison and control unit 266 are connected (A2 and B2 connection).

3 is a flowchart illustrating a method of controlling a backup battery charge in a wireless communication terminal according to the present invention.

First, as the main battery 21 is connected, the backup battery charge control unit 26 outputs a low backup battery charge end control signal to the switch 22 by default (301).

On the other hand, when the analog switch 262 receives a low (low), and transfers the voltage level of the backup battery 25 to the comparison and control unit 266, the backup battery charge control unit 26 voltage of the backup battery 25 The level is passed (302).

Thereafter, it is determined whether the voltage level of the backup battery 25 exceeds the threshold voltage level (303).

As a result of the determination 303, the backup battery charge control unit 26 sends a high backup battery charge control signal to the switch 22 as the voltage level of the backup battery 25 does not exceed the threshold voltage level. Output 304.

Thereafter, the switch 22 is turned on as the high backup battery charge control signal is received, and the real time clock regulator (RTC-LDO Regulator) 23 is transferred from the main battery 21. The backup battery 25 is charged by applying the received power to the backup battery 25 (305).

On the other hand, the analog switch 262 receives a high input, and transfers the charge current level detected by the voltage detector 261 to the level shifter 263. Then, when the level shifter 263 and the amplifier 264 convert the charging current level and transmit it to the comparison and control unit 266, the backup battery charge control unit receives the converted value of the charging current level of the backup battery (306).

Thereafter, it is determined whether the conversion value of the charging current level of the backup battery 25 exceeds the threshold voltage level (307).

As a result of the determination 307, as the conversion value of the charging current level of the backup battery 25 does not exceed the threshold voltage level, the process proceeds to the “304” process to continue charging.

On the other hand, as the determination result 307, as the conversion value of the charging current level of the backup battery 25 exceeds the threshold voltage level, the backup battery charge control unit 26 to the switch 22, the low backup battery The charging end control signal is output (308).

Then, the switch 22 is turned off to discharge the backup battery 35 (309), and proceeds to the "302" process.

On the other hand, the determination result 303, the process proceeds to "308" as the voltage level of the backup battery 25 exceeds the threshold voltage level.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention as described above, by controlling the charging of the backup power charging means by turning on / off the power applied to the backup power applying means in accordance with the charging state (voltage level) or the charging current level of the backup power charging means, There is an effect that can reduce unnecessary current consumption in the power applying means.

Claims (7)

In a mobile terminal, Power supply means for supplying power to internal components of the portable terminal; Switching means turned on / off according to control of the backup power charging control means; Backup power applying means for applying power received from the power supply means through the switching means to backup power charging means; The backup power charging means charged with the power received from the backup power applying means; Current sensing means for sensing a charging current flowing in the backup power charging means; And The backup power charging control means for controlling whether the backup power charging means is charged according to the charging current level received from the current sensing means and the voltage level received from the backup power charging means. A mobile terminal having a backup power charging control function comprising a. The method of claim 1, The switching means, A portable having a backup power charging control function, characterized in that the transistor is turned on / off according to the backup power charging control signal or the backup power charging termination control signal received from the backup power charging control means. terminal. The method of claim 2, The current sensing means, And a resistor for sensing a charging current charged in the backup power charging means. The method according to any one of claims 1 to 3, The backup power charging control means, Voltage level detecting means for detecting a voltage level across the current sensing means; As the backup power charging control signal is received from the comparing and controlling means, the voltage level detected by the voltage level detecting means is transferred to the level converting means, and the backup power charging termination control signal is received from the comparing and controlling means. Path selection means for transferring the voltage level of the backup power charging means to the comparison and control means; The level converting means for converting the voltage level detected by the voltage level detecting means received from the path selecting means; Reference voltage generating means for generating a reference voltage to be compared with the voltage received from said level converting means; Amplifying means for outputting a voltage exceeding a threshold voltage level when the voltage received from the level converting means is less than a reference voltage; And The voltage level received from the backup power charging means or the voltage level received from the amplifying means through the path selection means is compared with a predetermined threshold voltage level, and a backup power charging control signal or a backup power charging termination control signal corresponding thereto is obtained. Said comparing and controlling means for outputting to said switching means and said path selecting means A mobile terminal having a backup power charging control function comprising a. In the backup power charging control method in a mobile terminal, Determining whether the voltage level of the backup power charging means or the backup power charging current level conversion value exceeds a threshold voltage level; As a result of the determination step, the backup power charging for charging the backup power charging means by outputting a backup power charging control signal when the voltage level or backup power charging current level conversion value of the backup power charging means is less than a threshold voltage level. step; And As a result of the determination step, the backup power charging end control signal is output by discharging the backup power charging end control signal when the voltage level of the backup power charging means or the backup power charging current level conversion value is equal to or greater than a threshold voltage level, thereby terminating the charging of the backup power charging means and discharging it. Backup power discharge phase Backup power charging control method in a mobile terminal comprising a. The method of claim 5, wherein The backup power charging step, Comparing and controlling means for outputting a backup power charging control signal when the voltage level of the backup power charging means is less than a threshold voltage level; Switching the charging means to the backup power charging means by the power received from the power supply means; Detecting a charging current level of the backup power charging means according to a backup power charging control signal; Converting the sensed level of charging current; And Continuing charging as the charge current level conversion value of the backup power charging means is less than a threshold voltage level. Backup power charging control method in a mobile terminal comprising a. The method of claim 6, The backup power discharge step, Outputting, by the comparing and controlling means, a backup power charging end control signal when the charging current level conversion value of the backup power charging means is equal to or greater than a threshold voltage level; Turning off the switching means; Receiving a voltage level of the backup power charging means; And Continuing discharge as the voltage level of the backup power charging means is greater than or equal to a threshold voltage level; Backup power charging control method in a mobile terminal comprising a.

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