KR101175369B1 - Apparatus and Methode of measuring charges in a battery - Google Patents

Abstract

The present invention relates to a battery remaining amount measuring device and a measuring method for measuring the remaining battery level based on the temperature of the battery.

A battery level display device according to an embodiment of the present invention is configured as follows. The temperature sensor unit 33 generates an electric signal corresponding to the temperature of the battery 31. The memory unit 34 stores a battery remaining reference value corresponding to the battery temperature and the battery use. The CPU 35 verifies whether the battery voltage V _bat converted into digital data by the ADC 32 is a valid voltage, and based on the electrical signal generated by the temperature sensor unit 33, Determine the temperature. The CPU 35 determines the current battery usage, and extracts a battery remaining reference value corresponding to the determined battery temperature and battery usage from the memory unit 34. The CPU 35 determines the remaining battery effective value based on the extracted battery remaining reference value and the battery voltage V _bat verified as the valid voltage. The display unit 36 displays the battery remaining amount effective value determined by the CPU 35. Accordingly, the present invention has the effect of making accurate battery level measurement.

Battery, ADC, Battery Gauge IC Chip, Voltage Dip

Description

Apparatus and Methode of measuring charges in a battery}

1 is a block diagram of a conventional battery level measuring device.

2 is a discharge voltage characteristic diagram illustrating a voltage variation during discharge of a battery.

3 is a block diagram of a battery level measuring device applied to a preferred embodiment according to the present invention.

4 illustrates a battery mode designated according to battery temperature and battery usage.

5A through 5E are graphs illustrating a battery remaining reference value for each battery mode.

6 is a graph illustrating a process of verifying whether a battery voltage V _bat is an effective voltage according to an exemplary embodiment of the present invention.

7A and 7B are flowcharts illustrating a method of measuring remaining battery capacity applied to an exemplary embodiment of the present invention.

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

11,31: Battery 12,32: ADC (Analog-Digital Converter)

13,35: CPU (Central Processing Unit)

14,36: display unit 33: temperature sensor unit

34: memory

The present invention relates to a device and a method for measuring the amount of charge remaining in the battery (also referred to as "battery remaining charge or battery remaining"), in particular a battery remaining charge measuring device for measuring the battery residual charge based on the temperature of the battery And to a measuring method.

Typically, batteries are electronic devices that can be used on the go, such as mobile phones, PDAs (Portable Data Apparatus), notebook computers, handheld game machines, digital cameras, MP3 players, portable multimedia players (PMPs). It is used as a power supply to supply power for various portable electronic devices such as Multimedea Player). Because these batteries accumulate a limited amount of charges, they are forced to power portable electronics only for a limited time period.

Therefore, the user of the portable electronic device loses important information in operation due to the completion of discharge of the battery or cannot perform important work at a desired time. In addition, in the case of the rechargeable battery corresponding to the secondary battery, the battery may be damaged or the life of the battery may be reduced due to excessive charging and discharging of the charge, thereby increasing the cost of the user of the portable electronic device. In order to prevent such a damage caused by the battery, there is a need for a battery level measurement technology that can instruct the user of the remaining charge of the battery.

Techniques for measuring the remaining battery capacity include a method using a battery gauge integrated circuit (hereinafter referred to as an "IC") chip, and a method using a battery voltage.

The method using the battery gauge IC chip measures the remaining charge of the battery in consideration of various conditions such as changes in chemical characteristics, volume, current, and voltage inside the battery. In the method using this battery gauge IC chip, although the accuracy and reliability of the residual charge measurement is guaranteed, an expensive gauging IC chip must be used for simple functions such as measurement and display. Therefore, the method using the gauge IC chip is excessively expensive.

On the other hand, the method of measuring the remaining battery capacity using the voltage of the battery cannot guarantee the accuracy and reliability of the remaining battery measurement due to the structural characteristics of the measurement method and the voltage characteristic of the battery discharge, but it does not cover the cost burden of the portable electronic device manufacturer. It can be minimized.

That is, the conventional battery level measuring device based on the voltage of the battery, as shown in the block diagram of Figure 1, the voltage divider (R1, R2), analog-to-digital converter (Analog-Digital Converter, hereinafter referred to as "ADC") (12), a central processing unit (hereinafter referred to as "CPU") 13 and a display unit 14 are configured. Therefore, when the discharge voltage of the battery divided by the resistance voltage dividers R1 and R2 is converted into digital data through the ADC 12 and input to the CPU 13, the CPU 13 corresponds to the battery corresponding to the input voltage data. The remaining amount was controlled to be displayed through the display unit 14.

As described above, since the CPU 13 judges the remaining amount of the battery by using only the battery voltage, the remaining battery amount according to the temperature even if the measured voltage is the same because the battery voltage characteristic is not stable to the temperature due to the characteristics of the electronic component. This different judgment made it impossible to accurately measure the remaining battery level.

In particular, the voltage of the battery, as shown in Fig. 2, is slightly lowered from 4.2V to 3.6V, because the battery remaining measurement operation is usually performed within this range may affect the battery voltage, such as temperature With these variables in place, it becomes more difficult to accurately measure the battery level.

In addition, when a voltage dip occurs due to a change in the system load, the battery voltage temporarily drops, whereby the CPU 13 determines that the remaining battery level is low even though the remaining battery capacity remains. By setting the mode to a sleep mode or a deep sleep mode, the user's use is unnecessarily restricted or the end of discharge of the battery 11 is not detected, and thus important information of the user is lost. It became.

Accordingly, an object of the present invention is to provide a battery remaining amount measuring device and a measuring method for measuring the remaining amount of battery more accurate when measuring the remaining amount of the battery using the voltage of the battery.

Battery remaining amount measuring apparatus according to an embodiment of the present invention for achieving the above object, the voltage measuring unit for measuring the battery voltage; A temperature measuring unit measuring a battery temperature; A storage unit for storing a battery remaining reference value corresponding to each of at least one battery temperature; An extraction unit configured to extract a battery remaining reference value corresponding to the measured battery temperature; And a determination unit determining a battery residual value effective value based on the extracted battery residual reference value and the measured battery voltage.

The battery temperature may be any one of a normal temperature mode, a high temperature mode, and a low temperature mode.

The apparatus further includes a usage determination unit for determining a battery use, wherein the battery remaining reference value corresponds to at least one or more battery temperatures and at least one or more battery uses, and wherein the extractor is configured to determine the measured battery temperature and the determined battery temperature. The battery remaining reference value corresponding to the battery usage may be extracted.

The battery usage may be any one of a satellite broadcasting reception mode, an audio listening mode, a movie watching mode, a document working mode, and a pause mode.

The verification unit may further include a verification unit verifying whether the measured battery voltage is a valid voltage. When the verification unit verifies that the measured battery voltage is a valid voltage, the extracted battery remaining reference value and the verified The effective amount of remaining battery power may be determined based on the effective voltage.

The verification section, a difference between the predetermined period (T) the second battery voltage (V _bat2) measured for each, and the second to measure the battery voltage in one period (1T) prior to the first battery voltage (V _bat1) measured in ( I) If (V _bat1 -V _bat2 ) exceeds the threshold, it may be verified whether the second battery voltage is an effective voltage.

The verification unit may compare the re-measured third battery voltage V _bat3 with the first and second battery voltages after a predetermined time exceeding the one cycle 1T after measuring the second battery voltage. When the third battery voltage V _bat3 has a value between the first battery voltage and the second battery voltage (V _bat1 > V _bat3 > V _bat2 ), the second battery voltage is not a valid voltage and the first battery. The second battery voltage may be replaced with a voltage that is 1% lower than the voltage.

In addition, the battery remaining amount measuring method according to an embodiment of the present invention, the voltage measuring step of measuring the battery voltage; A temperature measuring step of measuring a battery temperature; An extraction step of extracting a battery remaining reference value corresponding to the measured battery temperature; And determining a remaining battery effective value based on the extracted battery remaining reference value and the measured battery voltage.

The battery temperature may be any one of a normal temperature mode, a high temperature mode, and a low temperature mode.

The temperature measuring step may further include a usage determination step of determining a battery use, and the extracting step may extract a battery remaining reference value corresponding to the battery temperature and the battery use.

The battery usage may be any one of a satellite broadcasting reception mode, an audio listening mode, a movie watching mode, a document working mode, and a pause mode.

The voltage measuring step may further include a verifying step of verifying whether the measured battery voltage is an effective voltage, and the remaining amount determining step is performed when the measured battery voltage is verified to be an effective voltage in the verifying step. The remaining battery level effective value may be determined based on the determined battery remaining reference value and the verified valid voltage.

The verification step, the car having a predetermined period the second battery voltage measured each time (T) (V _bat2), and the second of the first battery voltage (V _bat1) measured prior to measuring the battery voltage in one period (1T) ( _Iii ) a first step of calculating (V _bat1 -V _bat2 ); A second step of comparing the difference (V _bat1 -V _bat2 ) with a threshold value; And a third step of verifying whether the second battery voltage is a valid voltage when the difference exceeds a threshold.

The third step may include a third step of measuring a third battery voltage V _bat3 after a predetermined period of time exceeding the one cycle 1T after measuring the second battery voltage; Step 3-2 of comparing the first, second and third battery voltages; As a result of the comparison, when the third battery voltage V _bat3 has a value between the first battery voltage and the second battery voltage (V _bat1 > V _bat3 > V _bat2 ), it is determined that the second battery voltage is not an effective voltage. Steps 3-3; And replacing the second battery voltage with a voltage 1% lower than the first battery voltage.

With the above configuration and flow, the battery remaining amount measuring device and the measuring method according to the present invention allow a more accurate remaining amount of battery to be measured.

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

In this embodiment, since battery use is one of the variables affecting battery voltage no less than battery temperature, it is proposed to use a battery remaining reference value corresponding to battery temperature and battery use for measuring battery remaining. Of course, it may be suggested that other variables affecting the battery voltage be added to the battery temperature and used for the remaining battery measurement.

3 is a block diagram of a battery level measuring device applied to a preferred embodiment of the present invention, Figure 4 illustrates a battery mode specified according to the battery temperature and battery usage, Figures 5a to 5e for each battery mode The battery level reference value is illustrated as a graph.

Apparatus for measuring a battery remaining amount applied to a preferred embodiment of the present invention is configured as follows.

The resistor voltage dividers R1 and R2 are connected in series to the battery 31. The ADC 32 converts the battery voltage V _bat divided by the resistor voltage dividers R1 and R2 into digital data.

The temperature sensor unit 33 generates an electric signal corresponding to the temperature of the battery 31. The memory unit 34 stores a battery remaining reference value corresponding to the battery temperature and the battery use.

The CPU (Central Processing Unit) 35 verifies whether the battery voltage V _bat converted into digital data by the ADC 32 is a valid voltage.

The CPU 35 determines the temperature (normal temperature mode, high temperature mode, low temperature mode) of the battery based on the electrical signal generated by the temperature sensor unit 33, and uses the current battery (satellite broadcast reception mode). After determining the audio listening mode, the movie watching mode, the document working mode, the idle mode, and extracting the battery remaining reference value corresponding to the battery temperature and the battery use determined from the memory unit 34.

The CPU 35 determines the battery residual value effective value based on the extracted battery residual reference value and the battery voltage V _bat verified as the effective voltage.

The display unit 36 displays the battery remaining amount effective value determined by the CPU 35.

As illustrated in FIG. 4, the battery temperature and battery use mentioned above are three battery temperatures (at room temperature mode (23 degrees), high temperature mode (40 degrees), low temperature mode (5 degrees)) and five battery uses ( Satellite broadcasting mode, audio listening mode, movie watching mode, document processing mode, idle mode).

Therefore, the CPU 35 determines one of three battery temperatures and one of five battery uses, and as a result, as shown in FIG. 4, a total of 15 battery modes can be designated. Of course, battery temperature and battery usage can be further subdivided or specified without departing.

In addition, the battery remaining reference value stored in the memory unit 34 is set differently according to the 15 battery modes (mode 1 to mode 15) specified as described above, which is shown in graphs in FIGS. 5A to 5E. As illustrated.

For reference, in the graphs of FIGS. 5A to 5E, the vertical axis corresponds to the battery voltage V _bat and the horizontal axis corresponds to the charging time tc. Here, the battery residual amount reference value is a battery total capacity-battery discharge amount, and is calculated as battery discharge amount = charge time * battery current.

In addition, since the battery current is set to a constant value according to the hardware environment (for example, backlight, volume, etc.) of the system in which the battery is mounted, the charging time corresponding to the variable in calculating the remaining battery reference value Knowing this makes it easy to calculate the battery level threshold. Therefore, the charging time is typically used in a variable representing the battery remaining reference value.

6 is a graph illustrating a process of verifying whether the battery voltage is a valid voltage by the CPU 35, and FIGS. 7A and 7B are flowcharts illustrating a hardware error display method of a computer according to an exemplary embodiment of the present invention. The operation of the battery remaining measuring device according to the present invention configured as described above will be described in detail with reference to FIG. 6 and in parallel with the flows of FIGS. 7A and 7B.

First, the voltage of the battery measured by dividing from the resistance voltage dividers R1 and R2 is converted into digital data through the ADC 32 and input to the CPU 35 at a predetermined period (T = 1 second) (S701).

The CPU 35 determines whether the input battery voltage is within the battery remaining measurement range of 3.6 V or more, and if the battery voltage is within the remaining battery measurement range of 3.6 V or more (YES in S702), the battery voltage V _bat is increased. It is verified whether it is due to a temporary voltage dip, that is, whether it is a valid voltage (S703).

The battery voltage verification process by the CPU 35 is as shown in FIG. 7B.

First, the CPU 35 inputs a measurement input one cycle 1T before the battery voltage to be verified (V _bat , hereinafter referred to as a second battery voltage V _bat2 ) and the second battery voltage V _bat2 . ΔV (= V _bat1 -V _bat2 ) corresponding to the difference between the used battery voltages (hereinafter referred to as first battery voltage V _bat1 ) is calculated (S703-1). If the calculated ΔV is greater than or equal to the threshold value 0.1V (YES in S703-2), the CPU 35 may have a predetermined time exceeding the battery voltage measurement period 1T (this embodiment proposes to be 15 seconds), that is, for 15 seconds. Wait without receiving the battery voltage (S703-3).

After waiting for 15 seconds, the battery voltage (hereinafter referred to as the third battery voltage V _bat3 ) through the ADC 32 is measured (S703-4) and input to the CPU 35, the CPU 35 The third battery voltage is compared with the first and second battery voltages.

As a result of the comparison, when the third battery voltage has a value between the first battery voltage and the second battery voltage (V _bat1 > V _bat3 > V _bat2 ) (example of S703-5), the CPU 35 determines the second to be verified. It is determined that the battery voltage is not a valid voltage, and a value 1% lower than the first battery voltage is replaced with the second battery voltage (V ' _bat2 = 1% lower than V _bat1 ) (S703-6).

By going through the process of verifying the battery voltage by the CPU 35 in this way, as shown in the graph of FIG. 6, even if the battery voltage is temporarily _dropped , such as V _bat2 [Battery total capacity-battery method] Instead of immediately determining that the total amount {= battery current (constant value) * t _c2 } is low, wait for 15 seconds to stabilize the hardware, measure the battery voltage V _bat3 again, and lower the battery voltage V _bat1 by 1%. By replacing the value with the effective voltage of the second battery voltage V _bat2 , a more accurate battery residual amount [= battery total capacity-battery discharge amount {= battery current (constant value) * t _c2 }] can be measured. This is _because, t _c2, so the amount of discharge in the battery t _{c2 'c2} t> t _c2 is larger than the discharge amount of the battery at, the battery power level at t _c2 is less than the amount of power left in the battery at t _c2'.

On the other hand, when an electrical signal corresponding to the battery temperature is input through the temperature sensor unit 33, the CPU 35 determines the battery temperature based on the input electrical signal, and determines the use of the battery currently being used. (S704).

The CPU 35 designates a battery mode based on the determined battery temperature and the battery use (S705), and extracts a battery remaining reference value corresponding to the designated battery mode from the memory unit 34 (S706).

In operation S707, the CPU 35 may determine the remaining battery effective value based on the extracted battery remaining reference value and the verified valid voltage.

That is, the CPU 35 calculates the battery discharge amount by using the charging time corresponding to the verified battery voltage in the extracted battery remaining reference value graph (graph corresponding to one of the modes 1 to 15), and calculates the battery. The battery residual amount effective value is determined by subtracting the battery discharge amount calculated from the total capacity.

On the other hand, when the battery voltage is less than 3.6V out of the battery remaining measurement range (NO in S702) and the battery voltage is 3.3V or more (YES in S708), the CPU 35 displays a low battery warning message through the display unit 36. In operation S709, the battery power is turned off (S710). In addition, when the battery voltage is less than 3.3 V (NO in S708), the CPU 35 immediately turns off the battery power (S710).

As described above, the present invention has an effect of more accurate battery remaining amount measurement based on the battery temperature and the use of the battery when measuring the remaining amount of the battery using the voltage of the battery.

In addition, the present invention, based on the battery temperature and the battery usage when measuring the remaining capacity of the battery using the voltage of the battery, while having a similar effect to when using a battery gauge IC chip, while reducing the production cost and cost There is.

In addition, the present invention has the effect of preventing unnecessary use of the user by selecting an optimum end of discharge voltage when measuring the remaining amount of the battery using the voltage of the battery.

In addition, the present invention has an effect suitable for preventing the loss of important information of the user by selecting an optimal end of discharge voltage when measuring the remaining amount of the battery using the voltage of the battery.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and those of ordinary skill in the art to which the present invention pertains should not depart from the spirit and scope of the present invention. It will be apparent that various modifications, changes and equivalent other embodiments are possible without departing. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (20)

A voltage measuring unit measuring a battery voltage; A verification unit verifying whether the measured battery voltage is an effective voltage; A temperature measuring unit measuring a battery temperature; A storage unit storing a battery remaining reference value corresponding to each of at least one battery temperature; An extraction unit configured to extract a battery remaining reference value corresponding to the measured battery temperature; And And a determination unit determining a battery residual value based on the extracted battery residual reference value and the measured battery voltage. The method of claim 1, The battery temperature measuring device is any one of a room temperature mode, a high temperature mode, and a low temperature mode. The method according to claim 1 or 2, Further comprising a use determination unit for determining the battery use, The battery remaining reference value corresponds to at least one battery temperature and at least one battery use, And the extractor extracts a battery remaining reference value corresponding to the measured battery temperature and the determined battery usage. The method of claim 3, The use of the battery is any one of a satellite broadcasting reception mode, audio listening mode, movie watching mode, document operation mode, idle mode, characterized in that the battery level measuring device. The method according to claim 1 or 2, The determination unit, And when the measured battery voltage is verified to be a valid voltage by the verification unit, determining a remaining battery effective value based on the extracted battery remaining reference value and the verified valid voltage. The method of claim 5, wherein the verification unit, And a predetermined period (T) measured second battery voltage (V _bat2) each, to said second measured battery voltage in one period (1T) difference (差) between before the first battery voltage (V _bat1) measured in (V _bat1 -V _bat2 ) when the threshold value exceeds the threshold value, characterized in that for verifying whether the second battery voltage is a valid voltage. The method of claim 6, wherein the verification unit, After measuring the second battery voltage after a predetermined time exceeding the one cycle 1T, the re-measured third battery voltage V _bat3 is compared with the first and second battery voltages, As a result of comparison, when the third battery voltage V _bat3 has a value between the first battery voltage and the second battery voltage (V _bat1 > V _bat3 > V _bat2 ), the second battery voltage is not a valid voltage and the first battery voltage. The battery level measuring device, characterized in that for replacing the second battery voltage to a voltage lower than 1%. The method of claim 3, The determination unit, And when the measured battery voltage is verified to be a valid voltage by the verification unit, determining a remaining battery effective value based on the extracted battery remaining reference value and the verified valid voltage. The method of claim 8, wherein the verification unit, And a predetermined period (T) measured second battery voltage (V _bat2) each, to said second measured battery voltage in one period (1T) difference (差) between before the first battery voltage (V _bat1) measured in (V _bat1 -V _bat2 ) when the threshold value exceeds the threshold value, characterized in that for verifying whether the second battery voltage is a valid voltage. The method of claim 9, wherein the verification unit, After measuring the second battery voltage after a predetermined time exceeding the one cycle 1T, the re-measured third battery voltage V _bat3 is compared with the first and second battery voltages, As a result of comparison, when the third battery voltage V _bat3 has a value between the first battery voltage and the second battery voltage (V _bat1 > V _bat3 > V _bat2 ), the second battery voltage is not a valid voltage and the first battery voltage. The battery level measuring device, characterized in that for replacing the second battery voltage to a voltage lower than 1%. delete delete delete delete delete delete delete delete delete delete

Images