KR101206124B1 - Gauge apparatus and method for remanent capacity of battery - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery remaining amount display device and method for compensating battery remaining amount in accordance with load current fluctuation so as to be displayed accurately.

Battery remaining amount measuring apparatus according to the present invention, means for detecting a battery voltage; Means for detecting a load current variation from the battery; Means for compensating and measuring the detected battery voltage according to the load current variation; Means for displaying the measured battery voltage.

Battery, level, measurement

Description

Apparatus and method for remanent capacity of battery

1 is a flow chart showing a conventional method of measuring the remaining battery power.

Figure 2 is a block diagram showing a conventional battery remaining measuring device.

Figure 3 is a conventional battery voltage and discharge current graph.

Figure 4 is a block diagram showing a battery remaining amount measuring apparatus according to the present invention.

5 is a battery voltage and discharge current graph of FIG.

6 is a view showing a battery remaining measurement method according to the present invention.

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

110 Main battery 120 Voltage divider

130,150 ... analog digital converter 125 ... current detector

140 ... Operation Amplifier 160 ... Central Processing Unit

170 ... Display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery remaining amount display device and a method thereof, in which a residual amount of battery is compensated according to a load current change to be displayed accurately.

In general, modern people living in the flood of electronic devices use certain electronic devices according to their respective uses. Among them, information processing devices such as computers, notebook computers, electronic notebooks, and personal digital assistants (PDAs) for processing a large amount of information are popular. Next, the most prominent terminals are MP3 players and PMPs. (Portable Multimedia Player) and so on. In addition, the broadcasting reception function is also added as a complex function of the terminal.

Each of these information processing devices or communication devices require the supply of power for the operation of the device. When the power outlet is nearby, the device can be used by directly connecting to an outlet and receiving power. If there is no outlet for the surroundings, the battery as an auxiliary power supply is mounted inside.

The battery can be used as an auxiliary power source when the supply of main power is interrupted, and when time permits in an information processing device or communication device to be charged, the device is used without supplying the main power after charging a predetermined amount. It is also a device that can be replaced or recharged when the power is exhausted. In order to measure the remaining amount of the battery, a system that checks the battery state of the portable terminal by a protection circuit and a fuel gauge built in the battery pack of the portable terminal and displays the remaining amount information.

FIG. 1 is a flowchart illustrating a conventional method of detecting a remaining battery level. In this conventional method of detecting a remaining battery level, a remaining battery level detected by an analog value is detected by a remaining IC (Gauging IC) built in a terminal battery pack. Step (S1); Converting the value detected by the remaining amount measuring unit into a digital value (S2); And displaying, by the user interface, a digital value representing the serviceable battery level (S3).

The battery pack may be divided into a battery pack having a built-in gauging IC and a battery pack that does not have a built-in battery pack. To lower the price of the battery pack, Non-Smart Battery is applied without a gauging IC inside the battery pack.

2 is a block diagram illustrating a conventional battery remaining amount display device.

Referring to FIG. 2, a main battery 10 for supplying power to a system, a voltage divider 20 for dividing a discharge voltage of the main battery, and an analog to digital converter for converting the divided voltage into digital data 30 and a central processing unit 40 which recognizes the digitally converted data and displays the same on the display unit 50.

Referring to the operation of the battery remaining amount display device, the main battery 10 supplies system power. In this case, the voltage divider 20 divides the battery discharge voltage by using the resistors R1 and R2. The voltage divider 20 adjusts the voltage level of the battery (up to 4.2V) to the input voltage range of the analog-to-digital converter 30.

The voltage divided by the voltage divider 20 is converted into digital data by the analog-to-digital converter 30, and the digital data is input to the central processing unit 40. The analog-to-digital converter 30 samples the divided battery voltages and converts them to digital.

The central processing unit 40 recognizes the digital battery voltage converted by the analog-digital converter 30 and displays it on the display unit 50. At this time, the instantaneous noise and ripple values are filtered and displayed on the display unit.

However, since the remaining battery capacity is calculated only by the voltage difference of the battery, when the speaker is driven instantaneously and repeatedly and the hard disk drive (HDD) is accessed and the system's current consumption changes momentarily (Light load-> Heavy load), The measured battery voltage is momentarily varied (G1) and the overall discharge characteristics are changed as shown in FIG.

It is a first object of the present invention to provide a battery remaining amount measuring device capable of accurately measuring the remaining battery level.

The second object of the present invention is to measure the amount of current and to utilize the information in order to accurately calculate the remaining amount when the battery voltage changes due to the change in the current consumption of the battery.

Battery remaining amount measuring apparatus according to the present invention for achieving the above object,

Means for detecting a battery voltage;

Means for detecting a load current variation from the battery;

Means for compensating and measuring the detected battery voltage according to the load current variation;

Means for displaying the measured battery voltage.

Preferably, the battery voltage detecting means includes a voltage divider for dividing the battery voltage and a first analog digital converter for converting the divided voltage into digital data.

Preferably, the load current detecting means includes a current sensing unit for detecting a voltage difference between the discharge current and the charging current supplied from the battery to the system side, and second analog digital for converting the current sensed by the current sensing unit into digital data. It characterized in that it comprises a conversion unit.

Preferably, the load current detecting means further comprises an amplifier for amplifying the voltage difference sensed by the current sensing unit to a predetermined level.

Preferably, the current sensing unit is a resistor connected between the battery and the system.

Preferably, the battery voltage measuring means adds a coefficient indicating a degree of lowering the battery voltage according to the battery current to the detected battery voltage, and measures by multiplying the battery voltage and the load current to which the coefficient is added. .

A battery remaining measuring method according to the present invention comprises the steps of: detecting a battery voltage; Detecting a load current variation from the battery; Compensating and measuring the detected battery voltage according to the load current variation; And displaying the measured battery voltage.

Preferably, the load current detecting step includes: detecting a voltage difference between the discharge current and the charge current supplied from the battery to the system side; Amplifying the voltage difference to a predetermined level; And converting the amplified voltage difference into digital data to output the load current.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

3 is a diagram illustrating an apparatus for measuring a battery remaining amount according to an exemplary embodiment of the present invention.

Referring to FIG. 3, a main battery 110, a voltage divider 120 for dividing the voltage of the main battery, a first analog digital converter 130 for converting the divided voltage into digital data, and a load. The current detector 125 detects the difference between the discharge and charge current of the battery according to the variation as the voltage difference, and the operational amplifier 140 amplifies the voltage difference sensed by the current detector 125 to a predetermined level. And a second analog digital converter 150 for converting the voltage amplified by the operational amplifier 140 into digital data, and a digital voltage value converted by the first analog digital converter 130. The central processing unit 160 corrects and displays the display unit 170 according to the load current input to the second analog digital converter 150.

Referring to the accompanying drawings, a battery level measuring device according to the present invention configured as described above is as follows.

Referring to FIG. 3, the main battery 110 supplies power to the system, and the voltage divider 120 divides the voltage supplied to the system to detect a stable voltage range. Here, the voltage divider 120 divides the battery voltage level (eg, MAX 4.2V) into the input voltage range of the first analog digital converter 130 using two resistors R1 and R2.

The first analog digital converter 130 converts the battery voltage divided by the voltage divider 120 into digital data, and samples the converted battery voltage into a digital value.

The current detector 125 detects the voltage difference using the discharge current of the main battery 110 and the charge current to the battery. The current sensing unit 125 may be configured of, for example, a resistor R3. The resistor R3 is connected to one side of the main battery and the other side of the system. That is, the current detector 125 detects a load current variation between the main battery and the system as a voltage difference.

In addition, the voltage difference sensed by the current sensing unit 125 is a predetermined level, that is, a level that can be converted into digital data by the second analog digital conversion unit 150 by the operational amplifier 150. Amplify. In the operational amplifier 140, a positive terminal (+) is connected to a system resistance terminal and a negative terminal (−) is connected to a main battery side resistance terminal, thereby amplifying a voltage difference detected at both ends to a predetermined level.

The second analog digital conversion unit 150 converts the amplified value of the battery current change amount into a voltage to digital data. The second analog digital converter 150 may use an ADC pin that is not used by a power IC or an audio codec in the terminal.

The central processing unit 160 corrects the battery voltage according to the load current by using the digital data input to the first analog digital converter 130 and the digital data input to the second analog digital converter 150. The battery level is displayed on 170). The central processing unit 170 first filters instantaneous noise and ripple with respect to the digital voltage input to the first analog digital converter 130 to obtain an accurate battery voltage.

The central processing unit 160 compensates by adding or subtracting the digital data of the second analog digital converter 150 according to the load current variation based on the digital data of the first analog digital converter 130. The battery voltage reflecting the change amount is measured and displayed.

The compensated battery capacity is added to a low battery capacity and a coefficient (α) indicating how much the battery voltage is lowered according to the battery current, and then the added value is the battery current. It is multiplied by. Compensated battery capacity = battery capacity + α * battery current.

Here, the low voltage is a value obtained by converting the battery voltage input from the first analog digital converter 130 into a residual amount (%), and the battery current is a battery input from the second analog digital converter 150. Current.

In addition, the coefficient is calculated in advance to the extent that the battery voltage is lowered according to the battery current and stored in a table form, and is added to the low battery capacity. Here, the coefficient is a value stored after checking how much the battery voltage is lowered according to the increase or decrease of the battery current and the degree of increase or decrease. In addition, when the battery current is driven by the speaker drive and the hard disk drive by reproducing A / V data, the current consumption is changed instantaneously, and thus the coefficient can be calculated as the change information and the battery voltage are lowered. .

By doing this, the battery voltage graph shown in FIG. 5 is shifted horizontally (red color-> black graph), so that a reliable battery voltage can be measured regardless of a large change in load current. As such, when the battery voltage fluctuates due to the change of the current consumption on the system side, the measurement can be performed accurately and compensated according to the current amount.

6 is a view showing a battery remaining amount measuring method according to the present invention.

Referring to FIG. 6, after detecting the battery voltage (S101), the battery voltage is converted into digital data and detected (S103). At this time, by detecting the degree of change of the load current from the battery charge / discharge current to compensate for the digitally converted data of the battery (S105), the battery remaining amount is displayed more accurately (S107).

As such, by accurately recognizing the battery voltage according to the battery load variation, it is possible to optimize the use of the battery usage, it is possible to accurately measure the remaining amount.

So far, the present invention has been described with reference to the preferred embodiments, and those skilled in the art to which the present invention pertains to the detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. Could be implemented. The scope of the present invention is defined by the appended claims, and all differences within the scope of the claims are to be construed as being included in the present invention.

According to the battery remaining amount measuring apparatus according to the present invention, it is possible to optimize the use time by accurately measuring the remaining amount of battery.

In addition, it is possible to compensate the voltage difference according to the battery discharge current, it is possible to calculate a stable remaining amount.

Claims (8)

Battery voltage detecting means for detecting a battery voltage; Load current detection means for detecting a change in load current by detecting a voltage difference between the discharge current and the charge current supplied from the battery to the system side; Battery voltage measuring means for compensating and measuring the detected battery voltage according to the load current variation; And And display means for displaying the measured battery voltage. The method of claim 1, The battery voltage detecting means includes a voltage divider for dividing a battery voltage, and a first analog digital converter for converting the divided voltage into digital data. The method of claim 1, The load current detecting unit further comprises a second analog digital converting unit for converting the voltage difference sensed by the current sensing unit into digital data. The method of claim 1, The load current detecting means further comprises an amplifier for amplifying the voltage difference sensed by the current sensing unit to a predetermined level. The method of claim 1, And the current sensing unit is a resistor connected between the battery and the system. The method of claim 1, The battery voltage measuring means adds a coefficient indicating a degree of lowering the battery voltage according to the battery current to the detected battery voltage, and measures the remaining battery life by measuring the product of the added battery voltage and the load current. Device. Detecting a battery voltage; Detecting a load current variation by detecting a voltage difference between a discharge current and a charge current supplied from the battery to a system side; Compensating and measuring the detected battery voltage according to the load current variation; And displaying the measured battery voltage. 8. The method of claim 7, The load current detection step, Amplifying the voltage difference to a predetermined level; And And converting the amplified voltage difference into digital data and outputting the load current as a load current.

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