KR20060109772A - Methods and apparatus' of detecting battery capacity for mobile phone - Google Patents

Abstract

An apparatus and method for detecting battery capacity of a mobile terminal are provided to utilize a battery cell in an optimum state by accurately detecting a remaining capacity of the battery cell and controlling charging/discharging. The first FET(Field Effect Transistor)(140) receives a charge current from outside and is switched on/off according to a control signal of a controller(150) to set or cut off a transmission path of a charge current. The second FET(130) is connected with the first FET(140) and switched on/off according to a control signal of the controller(150) to set a transmission path of a charge current or a discharge current. A detection resistor(120) is connected with the second FET(130) and checks current consumption by detecting a voltage applied to both ends. A battery cell(110) is connected with the detection resistor(120) and charged with the charge current and discharges charged current. The controller(150) sets a path for charging and discharging current by controlling the first and second FET(140,130). The controller calculates current consumption by detecting the voltage of the both ends of the detection resistor(120).

Description

Battery capacity detecting device and method of mobile terminal {METHODS AND APPARATUS 'OF DETECTING BATTERY CAPACITY FOR MOBILE PHONE}

1 is a functional configuration of the battery capacity detection device of a portable terminal according to the prior art;

2 is a flowchart of a method for detecting battery capacity of a mobile terminal according to the prior art;

3 is a functional configuration of a battery capacity detection device of a mobile terminal according to the present invention;

4 is a flowchart of a method for detecting battery capacity of a mobile terminal according to the present invention.

** Explanation of symbols on the main parts of the drawing **

100: circuit part 110: battery cell 112: internal resistance

114: battery 120: detection resistance 130: second FM

140: first FM 150: control unit

The present invention accurately measures and displays the battery remaining capacity of a mobile terminal irrespective of the amount of temporary current consumption. In particular, the measured residual capacity value of the battery is accurately measured by detecting the magnitude of the current consumption output from the battery and calculating an offset value. The present invention relates to a battery capacity detecting apparatus and method for a portable terminal which is charged and discharged while being used for a long time while maintaining an optimal state.

A mobile terminal for mobile communication (MS) is a mobile station that communicates freely in a service area formed by a base station (RAN: RADIO ACCESS NETWORK), and communication costs are relatively high due to the system configuration characteristics. There is not a lot of time or time used directly for communication, and there is a characteristic to always carry for communication which may occur when.

The additional service is to solve the problem of low utilization rate or utilization rate of the mobile terminal as described above, to promote the use of mobile communication, and to effectively apply it to real life.

The additional services include, for example, a camera, a TV, an electronic calculator, a PDA, an MP3, a phone book, a GPS, a VOD, a text / video message, an online game, a wireless Internet access, a caller ID check, and the like. Developed and added.

As described above, the current consumption is rapidly increased while processing various functions with the portable terminal, the portable terminal is manufactured in a small size and light weight to ensure mobility, and the size of the battery is limited, so that the capacity of the current supplied by the battery is limited.

In case of using the mobile terminal for communication or using an additional service, if the battery stops due to insufficient capacity, it is to prevent the interruption as described above. The remaining capacity is checked by measuring the internal voltage of the battery. Many technologies have been developed and applied.

The technology for checking the remaining capacity by measuring the internal voltage of the battery includes a sudden drop in voltage due to internal resistance when the amount of current consumption increases rapidly, so that the capacity can be maintained even when the available capacity of the battery remains. There is a problem marked as lacking.

Therefore, there is a need to develop a technique for accurately detecting the remaining capacity of a battery even when the portable terminal temporarily consumes a large amount of current.

Hereinafter, a battery capacity detection method of a portable terminal according to the prior art will be described with reference to the accompanying drawings.

Attached to explain the prior art, FIG. 1 is a functional block diagram of a battery capacity detecting apparatus for a portable terminal according to the prior art, and FIG. 2 is a flowchart of a battery capacity detecting method for a portable terminal according to the prior art.

Referring to FIG. 1, the battery capacity detecting apparatus for a portable terminal according to the prior art will be described. The circuit unit 10 including all circuits necessary for operating a mobile terminal including a mobile communication circuit and an additional service circuit, The operating current is applied from the battery cell 20 under the control and monitoring of a power management IC (PMIC) 30.

The battery cell 20 is repeatedly used by charging and discharging, and a charge control signal of the controller 30 is applied to the first FM 50 to input external charging current. Therefore, the battery unit 10 is charged and the discharge control signal of the controller 30 is applied to the second F 40 to output the discharge current to the circuit unit 10, so that the circuit unit 10 operates.

The battery cell 20 is composed of a battery 24 for charging and discharging, and an internal resistance 22 existing in the battery 24, and when the battery cell 20 is discharged by a predetermined capacity or more, the battery cell 20 is destroyed.

The controller 30 monitors and measures the internal voltage of the battery cell 20, converts and analyzes the measured analog voltage signal into a digital signal, and checks whether or not it is discharged below the minimum allowable voltage.

The controller 30 controls the second FM 40 to block the output of the current from the battery cell 20 when a lower than the allowable voltage is detected by the internal voltage monitoring of the battery cell 20. .

The circuit unit 10 varies greatly in the amount of current consumed by the use state of the mobile terminal, that is, by the output power level when transmitting, and by the type of additional service operated when the additional service is used. do.

When the current consumption of the circuit unit 10 is large, a voltage drop occurs due to the internal resistance 22 of the battery cell 20, so that the internal voltage of the battery cell 20 is greater than the actual internal voltage. Measured low.

Therefore, when the circuit unit 10 consumes a large amount of current, the battery cell 20 is detected as an internal voltage lower than the actual internal voltage, and the second F 40 is turned off under the control of the controller 30. Since it is controlled in the state, the current of the battery cell is not supplied to the circuit portion, there is a problem that the portable terminal can no longer be used.

Hereinafter, a method of detecting a battery capacity of a portable terminal according to the prior art will be described with reference to FIG. 2.

In the case of selecting and operating a communication or additional service using a mobile terminal for mobile communication (S10), the controller 30 measures the internal voltage of the battery cell 20 (S20) and detects the remaining capacity of the battery cell 20. The battery bar is displayed as a battery bar (S30), and it is determined whether the detected remaining capacity of the battery cell 20 is below a minimum threshold value allowed (S40).

If the internal voltage of the battery cell 20 detected in the determination 40 is not lower than or equal to the minimum threshold, the control unit 30 returns to the second step S20. Since the 2F 40 is controlled to be in an OFF state, the discharge of the battery cell 20 is blocked (S50).

Therefore, the prior art having the above-described configuration simply detects the internal voltage of the battery cell 20 and generates an error in detecting the internal voltage of the battery cell 20 due to the overcurrent consumption of the circuit unit 10. Although it is possible to supply the operating current to, there is a problem of interrupting the supply of the operating current under the control of the controller.

The present invention detects the discharge current of a battery cell for charging and discharging a mobile terminal, calculates an offset value based on the consumption current, and corrects the detected internal voltage value of the battery cell, thereby accurately detecting and controlling the remaining capacity of the battery. It is an object of the present invention to provide an apparatus and method for detecting a battery capacity of a terminal.

In order to achieve the above object, the present invention, when it is determined that the charging current of the battery cell is applied by the portable terminal controller, by switching the first F and the second F to the ON state to control the battery cell After charging, when the circuit unit requests supply of an operating current, the second FM is switched on to control the discharge of the battery cell, and the first and second ends of the detection resistor connected between the battery cell and the second FM are controlled. The voltage of the contact point and the second contact point are respectively measured and the difference value is detected and divided by the detection resistor to calculate the offset value. The detected residual capacity value of the battery cell is corrected and displayed by the calculated offset value, and the battery cell is corrected. And when the remaining capacity value is equal to or less than a predetermined threshold value, the second FM is controlled to be turned off to block the discharge.

In addition, the present invention has been made in order to achieve the above object, the first F to receive the charging current from the outside and the on-off switching by the control signal of the control unit to set and block the charge current transmission path; A second FTV connected to the first FFT and switched on and off by a control signal of a controller to block the transmission paths of charge current and discharge current; A detection resistor connected to the second FM and detecting a voltage applied to both ends thereof, thereby detecting a current consumption; A battery cell connected to the detection resistor and charged with a charging current input under the control of a controller and discharging the charged current; And a control unit configured to control the first and second FMs to set a charging and discharging path of the current, and to detect a voltage between both ends of the detection resistor and calculate a current consumption.

In addition, the present invention devised to achieve the above object, if it is determined that the circuit unit is operated by the portable terminal control unit measures the voltage of the first contact point and the second contact point respectively, and detects the remaining capacity of the battery cell Calculates an offset value based on the measured voltage value and the detection resistance, and corrects and displays the detected residual capacity value of the battery cell, and discharges the current of the battery cell when the corrected residual capacity value is less than or equal to a predetermined threshold value. It is characterized by consisting of a series of processes to prevent the blocking.

In addition, the present invention devised in order to achieve the above object, when the circuit unit is operated by the control unit of the mobile terminal, the capacitance detection for measuring and detecting the voltage generated at the first contact point and the second contact point and the remaining capacity of the battery cell, respectively Process; An offset process of calculating an offset value by dividing a difference value between the voltage at the first contact point and the voltage detected at the second contact point by the control unit of the process by the detection resistance value; A remaining capacity process of correcting the remaining capacity of the battery cell by an offset value by the controller of the process and displaying the corrected remaining capacity as a remaining capacity of the battery cell; When the battery cell remaining capacity of the process is less than the set threshold value, characterized in that consisting of a threshold process for blocking the discharge of the battery cell.

Hereinafter, the present invention will be described with reference to the accompanying drawings, a battery capacity detecting apparatus and method of a mobile terminal.

3 is a functional diagram of a battery capacity detecting apparatus for a portable terminal according to the present invention, and FIG. 4 is a flowchart of a method for detecting battery capacity of a portable terminal according to the present invention.

According to the present invention with reference to the accompanying FIG. 3, the battery capacity detecting apparatus of the mobile terminal MS will be described. The battery cell 110 is charged by the controller (PMIC) 150 of the mobile terminal for mobile communication. When it is determined that the current is applied, the first F 140 and the second F 130 are switched to an ON state to charge the battery cell 110 and charge the battery cell 110. When the 100 requests the supply of the operating current, the second F 130 is switched to the ON state to control the discharging of the battery cell 110, and the battery cell 110 and the second F are controlled. The voltages of the first contact point P1 and the second contact point P2 by the both ends of the detection resistor 120 connected between the two resistors 130 are respectively measured, the difference value is detected, and the offset is divided by the value of the detection resistor 120. Calculates an offset value, corrects and displays the detected remaining capacity value of the battery cell 110 with the calculated offset value, and A block which is a predetermined threshold or less to control the second off the F ET (130) (OFF) the corrected remaining capacity value of the battery cell 110 is set to block the discharge (DISCHARGING).

Referring to the above configuration in more detail, since the charging current is applied from the outside and is switched on / off by the control signal of the controller 150, the first FM 140 sets and blocks the charging current transmission path. )Wow,

A second F 130 connected to the first F 140 and switched ON / OFF according to a control signal of the controller 150 to set and block a transmission path of charge current and discharge current; ,

It is connected to the second FM 130 and detects the voltage applied to both ends, so as to confirm the current consumption, to form a transmission path of the discharge current output from the battery cell 110, the first contact by the voltage drop A detection resistor 120 for detecting a different voltage value at each of P1 and the second contact P2,

It is connected to the detection resistor 120 and charged with the charging current input under the control of the controller 150 and discharges the charged current. If the charging current is applied, input and store the current, and if the discharge path is set, the stored current. A battery 114 for outputting and discharging the battery; A battery cell 110 formed of an internal resistor 112 integrally provided inside the battery;

The first FM 140 and the second FM 130 are controlled to set the charging and discharging paths of the current, and the voltages of both ends of the detection resistor are detected to calculate the current consumption. When the charging current is applied to the 140, the first F 140 and the second F 130 are switched to an ON state to control and monitor the battery cell 110 to be charged, and the circuit unit 100. When is operated, the second F 130 is switched to the ON state to supply the discharge current of the battery cell 110 to the circuit unit 100, and the first contact point P1 and the second contact point P2. ) Detects the difference value by detecting the voltages of the?), Calculates the offset value by dividing by the value of the detection resistor 120, compensates the voltage value detected at the first contact point P1 with the offset value, and sets the compensated value. If it is less than a predetermined minimum threshold value, the second F 130 is switched to an OFF state, thereby controlling the switching of the battery cell 110. And a control unit 150 that blocks the current I,

The contact between the detection resistor 120 and the battery cell 110 is configured as a first contact (P1),

The contact between the detection resistor (R) 120 and the second FM 130 is composed of a second contact (P2),

The circuit unit 100 is connected to the contacts of the first FM 140 and the second FM 130 to receive operating power from the battery cell 110 and to process mobile communication and additional services.

Hereinafter, according to the present invention having the configuration described above, a battery capacity detection device of a mobile terminal will be described in detail with reference to the accompanying drawings.

The circuit unit 100 of the mobile terminal (MS) is for mobile communication and a number of additional service operations, and is operated by being supplied with operating power from the battery cell 110, and the circuit unit 100 operates according to an operating state. It consumes less or more current.

In addition, the battery cell 110 is composed of a battery 114 for charging and discharging a current, and an internal resistance 112 integrally provided in the battery 114.

The internal resistance 112 generates a voltage drop due to the amount or magnitude of current flowing, and when the battery cell 110 outputs or discharges a large current, the battery cell 110 is caused by the internal resistance 112. The internal voltage of is measured low.

The battery cell 110 repeats charging and discharging. When the internal voltage drops below a predetermined level, the battery cell 110 is destroyed, and thus the battery cell 110 cannot continue charging and discharging.

When the internal voltage of the charging / discharging battery cell 110 having the above characteristics falls below a predetermined threshold level, discharge is cut off by monitoring and control of the controller 150, thereby extending the life of the battery cell 110. Extend.

According to the present invention, since the battery cell 110 having the above characteristics temporarily discharges a large amount of current, the internal voltage drops temporarily below a threshold level, and the discharge is blocked by the controller 150. Even in the state where the remaining capacity remains in the cell 110, the problem of failing to supply the operating power to the circuit unit 100 is corrected by the consumption current detection and offset value calculation to correct the remaining capacity value of the battery cell 110 in an optimal state. It is a technique to use more.

That is, the controller 150 controls switching the first FM 140 to an ON state when a current for charging the battery cell 110 is applied to the first FM 140 from the outside. At the same time, since the second F 130 is switched to the ON state, the charging current is applied to the battery cell 110 through the detection resistor 120 to charge the battery cell 110. do.

Since the controller 150 inputs and analyzes an analog voltage signal measured from the first contact point P1 by digital, it checks the internal voltage of the battery cell 110 and checks the identified internal voltage. When it is determined that the charging is completed by the analysis, the first F 140 and the second F 130 are controlled to be switched to the OFF state, and thus, the battery cell 110 is destroyed by overcharging. To prevent.

When the controller 150 monitors the circuit unit 100 and determines that the selected function is operated, the controller 150 controls the switching of the second FM 130 to an ON state, thereby controlling the battery cell 110. ) Is discharged and output while being discharged, and is applied to the circuit unit 100 through the detection resistor 120 and the second F 130 in the ON state.

The controller 150 controls the switching of the second F 130 to an ON state to supply operating power to the circuit unit 100, and at the same time, the first contact point P1 and the second contact point. Measure analog input voltage from P2 and convert it into digital signal.

The controller 150 obtains a value obtained by subtracting the voltage value measured from the second contact point P2 from the voltage value measured from the first contact point P1, and converting the difference value into the resistance of the detection resistor 120. Since the operation is divided by the value, the current value consumed by the circuit unit 100 is accurately calculated and grasped.

That is, since "(P1v-P2v) / R" operation is performed, the current consumption value of the circuit unit 100 is accurately determined and set to an offset value.

In addition, the voltage value detected from the first contact point P1 is analyzed to detect and confirm the value of the remaining capacity of the battery cell 110.

The checked remaining capacity value of the battery cell 110 is detected as a value smaller than the actual remaining capacity due to the voltage drop generated by the internal resistance 112, and accordingly the appropriate compensation using the calculated offset value, the battery The correct remaining capacity of the cell 110 is detected and displayed through the corresponding display unit.

The compensation value using the offset value is a value obtained by repeated experiments, and there is a slight difference depending on the type and characteristics of the battery 114 constituting the battery cell 110.

The controller 150 determines whether the remaining capacity value of the battery cell 110 compensated as described above is a voltage lower than or equal to a predetermined threshold voltage level, and when determined to be a level lower than or equal to the threshold value, Since the second F 130 is switched to the OFF state, the discharge signal is blocked to prevent further discharge and at the same time, a guide signal for charging is output.

Accordingly, the present invention having the above-described configuration has an advantage of accurately displaying and controlling the remaining capacity of the battery cell because the current is accurately measured by the detection resistor and the compensation is performed by calculating the offset value.

Hereinafter, referring to the accompanying FIG. 4, according to the present invention, a method of detecting a battery capacity of a mobile terminal, when it is determined that the circuit unit 100 is operated by the mobile terminal controller 150 for mobile communication, is described. The voltages of the contact point P1 and the second contact point P2 are respectively measured, the remaining capacity of the battery cell 110 is detected, and the offset value is measured by the measured voltage value and the detection resistor 120, respectively. Compute and display the detected residual capacity value of the battery cell 110, and if the corrected residual capacity value is less than the predetermined threshold value configured to a series of processes to block the current of the battery cell 110 to discharge do.

According to the present invention having the above-described configuration, the battery capacity detection method of the portable terminal will be described again. When the circuit unit 100 is operated by the controller 150 of the portable terminal, the first contact point P1 and the second contact point ( The process of determining whether the circuit unit 100 is operated and requires supply of operating power by monitoring and detecting the voltage generated in P2) and the remaining capacity of the battery cell 110, respectively. (S100); In the process (S100), when the circuit unit 100 is operated to supply the operating power, the second F 130 is switched to the ON state to switch the operating power to supply the operating power, and to be detected. Measuring the voltages of the first contact point P1 and the second contact point P2, which are both ends of the resistor, respectively (S110); A capacity detecting process including a process of detecting a remaining capacity of the battery cell 110 by analyzing the voltage of the first contact point P1 detected in the process S110;

Offset for calculating the offset value by dividing the difference value between the voltage detected at the first contact point P1 and the voltage detected at the second contact point P2 by the detection resistor 120 value by the controller 150 of the capacitance detection process. Process (S130),

The controller 150 of the offset process (S130) corrects the detected remaining capacity of the battery cell 110 to an offset value and displays the corrected remaining capacity as the remaining capacity of the battery cell 10. Correcting the residual capacity value of the battery cell 110 detected at the first contact point P1 to the calculated offset value (S140); The remaining capacity process comprising the step (S150) of displaying the remaining capacity value corrected by the offset value of the battery cell 110 in the step (S140),

When the remaining capacity of the battery cell 110 of the remaining capacity process is less than or equal to a predetermined threshold value, the discharge of the battery cell 110 is cut off, and the predetermined value of the remaining capacity value of the battery cell 110 that is offset and displayed is set. Determining whether the threshold voltage value is equal to or less than S160; When the remaining capacity value of the battery cell 110 is less than or equal to the threshold voltage value in the process (S160), the process to block the discharge of the battery cell 110 by controlling the second F 130 (OFF) (S170) It consists of a threshold process consisting of.

Hereinafter, according to the present invention having the above configuration, a battery capacity detection method of a mobile terminal will be described in detail with reference to the accompanying drawings.

The controller 150 of the mobile terminal for mobile communication determines whether to operate by monitoring the circuit unit 100 (S100), and the circuit unit 100 by the control unit 150 operates a function selected from the mobile communication or additional services. If it is determined that the output power, the discharge control signal is output to the second F 130 to switch to the ON (SWITCHING) control, so that the operating power discharged from the battery cell 110 is output to the detection resistor 120 It is applied to the circuit unit 100 through.

The controller 150 measures voltages P1v and P2v from the first contact point P1 and the second contact point P2 formed at both ends of the detection resistor, and the measured voltage is measured by the battery cell 110. The corresponding voltage drop generated by the internal resistance 112 value, the detection resistance 120 value, and the internal resistance value generated by the circuit unit 100 is measured (S110).

Among the voltage values measured in the step S110, the voltage value P1v measured from the first contact point P1 is analyzed to detect the remaining capacity value of the battery cell 110 (S120), and the first contact point ( Subtract the voltage value P2v measured from the second contact point P2 from the voltage value P1v measured from P1) and divide by the value of the detection resistor 120, that is, (P1v-P2v) / R operation The calculated value is set as an offset value (S130).

Since the remaining capacity value of the battery cell 110 detected directly from the first contact point P1 in the capacity detection process S120 is reflected by the voltage drop generated by the internal resistance 112, the accurate remaining capacity of the battery cell is reflected. It does not become a value and is detected as a low value.

Accordingly, the controller 150 accurately measures the current consumption of the circuit unit in the offset process S130, sets the measured current consumption value as an offset value, and directly detects the battery directly from the first contact point P1. The remaining capacity value of the cell 110 is corrected (S150).

The voltage P1v detected at the first contact point P1 reflects the voltage drop. The voltage drop is changed by the amount of current flowing, that is, the change of the current consumption. Calculate

The size of correcting the remaining capacity by the calculated offset value is to set the optimum value by repeated experiments, and since the battery cells 110 have different characteristics by the manufacturer, Different results are shown.

The controller 150 analyzes the remaining capacity value of the battery cell 110 corrected to the offset value as described above and determines whether or not it is below a predetermined threshold voltage value (S160).

The threshold voltage value is a minimum dischargeable voltage value for maintaining the charge / discharge characteristics of the battery cell 110.

If it is determined by the controller 150 of the step S160 that the remaining capacity value detected by the battery cell 110 and corrected to the offset value is equal to or less than a predetermined threshold value, the controller 150 determines the second F ( Since the discharge control signal is output to 130 to control the switching to the OFF state, the battery cell 110 is blocked from supplying the operating power by the discharge (S170).

Therefore, the present invention has the advantage of accurately detecting the remaining capacity of the battery cell 110 for supplying the operating power to the mobile terminal (MS) to maximize the optimum use.

The present invention of the above configuration, by calculating the offset value by measuring the change in the current consumption by the operating state of the portable terminal accurately detects the remaining capacity of the battery cell to control charging and discharging, to maximize the utilization of the battery cell in an optimal state There is an industrial use effect.

In addition, since the remaining capacity of the battery cell for supplying the operating power to the mobile terminal is accurately confirmed, there is a convenient effect in use to accurately determine the available state of the communication or additional service.

Claims (10)

When it is determined that the charging current of the battery cell is applied by the controller of the portable terminal, the battery cell is charged by switching the first FM and the second FM on, and when the circuit unit requests supply of the operating current, 2 FFT is switched on to control the discharge of the battery cell, and the voltages of the first contact point and the second contact point by the both ends of the detection resistor connected between the battery cell and the second FT are respectively measured and the difference value is measured. Detects and calculates an offset value by dividing by a detection resistance, and corrects and displays the detected remaining capacity value of the battery cell with the calculated offset value, and if the corrected remaining capacity value of the battery cell is equal to or less than a predetermined threshold value, The battery capacity detection device of a portable terminal, characterized in that the configuration is configured to block the discharge by controlling the tee off. A first FT that receives the charging current from the outside and switches on and off the switching current according to a control signal of the controller, and blocks the charging current transmission path; A second FTV connected to the first FFT and switched on and off by a control signal of a controller to block the transmission paths of charge current and discharge current; A detection resistor for identifying a current consumption since the voltage is connected to the second FM and detects a voltage applied to both ends thereof; A battery cell connected to the detection resistor and charged with a charging current input under the control of a controller and discharging the charged current; And a control unit configured to control the first and second FMs to set a current charging and discharging path, and to detect voltages at both ends of the detection resistor to calculate current consumption. Battery capacity detector. The method of claim 2, The contact of the detection resistor and the battery cell is configured as a first contact, A contact between the detection resistor and the second FFT is configured as a second contact, And a circuit unit connected to the contact point of the first FFT and the second FFT to receive operating power from the battery cell and to process mobile communication and additional services. The method of claim 2, wherein the detection resistance, And forming a transmission path of the discharge current output from the battery cell, wherein a different voltage value is detected at each of the first contact point and the second contact point by the voltage drop. The method of claim 2, wherein the control unit, When a charging current is applied to the first FM, the first FM and the second FM are switched on to control the battery cell to be charged, and when the circuit is operated, the second FM is turned on. Supplying the discharge current of the battery cell to the circuit by switching to the circuit, detects the difference value by detecting the voltages of the first contact point and the second contact point, and calculates the offset value by dividing by the detection resistance value. Compensating the voltage value detected at the contact point with an offset value, and if the compensated value is less than or equal to a predetermined minimum threshold value, switching to control the second FM to the off state to cut off the discharge current of the battery cell. Battery capacity detection device of a mobile terminal, characterized in that made. If it is determined that the circuit unit is operated by the portable terminal controller, the voltages of the first contact point and the second contact point are respectively measured, the remaining capacity of the battery cell is detected, and the offset value is calculated based on the measured voltage value and the detection resistance. And correcting and displaying the detected residual capacity value of the battery cell, and if the corrected residual capacity value is less than or equal to a predetermined threshold value, a series of processes for blocking a current of the battery cell from being discharged is performed. Battery capacity detection method. A capacity detection process of measuring and detecting a voltage generated at each of the first and second contacts and the remaining capacity of the battery cell when the circuit unit is operated by the controller of the portable terminal; An offset process of calculating an offset value by dividing a difference value between the voltage at the first contact point and the voltage detected at the second contact point by the control unit of the process by the detection resistance value; A remaining capacity process of correcting the remaining capacity of the battery cell by an offset value by the controller of the process and displaying the corrected remaining capacity as a remaining capacity of the battery cell; When the battery cell remaining capacity of the process is less than the set threshold value, the battery capacity detection method of the portable terminal, characterized in that it comprises a threshold process for blocking the discharge of the battery cell. The method of claim 7, wherein the dose detection process, Judging whether the circuit unit is operated by the control unit monitoring of the portable terminal and needs operation power supply; In the above process, when the circuit unit is operated to supply the operating power, the second FFT is switched on to supply the operating power, and the voltages of the first contact point and the second contact point, which are both ends of the detection resistor, are respectively supplied. Measuring process, And detecting the remaining capacity of the battery cell by analyzing the voltage of the first contact point detected in the above process. The method of claim 7, wherein the remaining capacity process, Correcting the remaining capacity of the battery cell detected at the first contact point by the control unit of the offset process to the calculated offset value; And displaying the remaining capacity corrected by the offset value of the battery cell. The method of claim 7, wherein the threshold value process, Determining whether the remaining capacity value of the battery cell displayed by offset correction in the remaining capacity process is equal to or less than a predetermined threshold voltage value; If the remaining capacity value of the battery cell is less than the threshold voltage value in the process, the battery capacity detection method of the portable terminal, characterized in that the step of controlling the second F to cut off the discharge of the battery cell.

Images