KR930008787B1 - Battery discharge control circuit of portable phone - Google Patents

Abstract

The circuit and method is for detecting the subtle voltage variation of battery by the A/D converter and displaying the discharge state by the times of elapsing. The circuit and method includes a A/D converter (4) for converting the output voltage of battery (6) into the digital data, a RAM (2) for saving the digital data, a ROM (3) for saving the standard voltage level and the discharging estimation voltage level, a CPU (1) for comparing the coltage level in the RAM with reference level in the ROM, a amplifier (7) for amplifying the controlled signal, and a LCD display unit (5) for displaying the battery discharge state by the letters.

Description

Battery Discharge State Recognition Circuit and Method of Mobile Phone

1 is a graph showing the state of battery discharge over time.

2 is a circuit diagram of a battery discharge state identification circuit of the portable telephone according to the present invention.

3 is a flowchart of a method of determining whether a battery is discharged in a portable telephone according to the present invention.

* Explanation of symbols for main parts of the drawings

1: CPU 2: RAM

3: ROM 4: A / D Converter

5: LCD display 6: Battery

7: amplifier 8: speaker

9: microcontroller

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery discharge state recognizing circuit and method for dividing a discharge state of a battery into several stages in a portable telephone and displaying the result over time.

The discharge state of the battery exhibits the characteristics as shown in FIG. That is, about 80% of the charging time maintains the standard voltage and then discharges rapidly after a certain time.

Conventionally, in order to recognize a battery discharge state, a sudden drop in battery voltage is detected by hardware and notified by an alarm. In this case, the standby time of the mobile phone can be extended if it is in the stand-by state. However, when the transmission current consumes about 10 times the standby state, that is, during a call, the voltage suddenly decreases. Since the power is off (OFF) can not continue the call and there is a problem that you can not call again if there is no spare battery.

In order to solve the above problems, the present invention provides an A / D converter in a microcontroller in a portable telephone to search for a minute battery voltage change and divide the battery into multiple stages to indicate a discharge state over time. It is an object of the present invention to provide a battery discharge state recognition circuit and method which can be recognized.

Battery discharge state recognition circuit of the portable telephone according to the invention for achieving the above object, the A / D conversion means for receiving the output voltage of the battery as an input to convert the digital data and provide the input through the A / D conversion means; RAM that stores the output voltage value of the battery converted into the received digital value, and the standard voltage level value during normal operation of the battery and the estimated discharge voltage level value of at least one battery voltage, which are preset through the experiment, are stored as reference values. A CPU which compares the output voltage value of the battery which is inputted through the ROM, the A / D conversion means, and is continuously stored in the RAM, and the reference value in the ROM, and outputs a control signal according to battery discharge; Receives a control signal output according to the discharge of the battery output so that the control signal is output through the speaker as an alarm signal And amplifying means for amplifying, and an LCD display for receiving a control signal output by the CPU according to the discharge of the battery output and displaying the battery discharge state as a character.

In addition, the battery discharge state recognition method according to the present invention, the first step of storing the reference data in the ROM and setting the counter, input the output voltage value of the battery input from the A / D conversion means to store in the RAM And a second step of comparing and comparing the first reference data stored in the ROM, and inputting battery power data from the A / D converting means to store in the RAM and to compare the second reference data stored in the ROM. A third step and a fourth step of inputting battery voltage data from the A / D conversion means to store in the RAM and to compare with the third reference data stored in the ROM.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a graph showing the state of battery discharge over time. 2 is a circuit diagram of a battery discharge state recognition circuit of a portable telephone according to the present invention, in which 1 is a CPU, 2 is a RAM, 3 is a ROM, 4 is an A / D converter, 5 is an LCD display, 6 is a battery, 7 Denotes an amplifier, 8 denotes a speaker, and 9 denotes a microcontroller.

As shown in FIG. 2, the battery discharge state acknowledgment circuit according to the present invention includes a CPU 1, a RAM 2 connected to the CPU 1, a ROM 3, and an A / D converter. (4) connects the amplifier (7) and the LCD display (5) to which the speaker (8) is connected to the microcontroller (9) and the battery to the input port of the A / D converter (4) of the microcontroller (9) (6) to detect the discharge state and when the battery (6) voltage is slightly lower than the standard voltage, the LCD (Liquid Crystal Display) display (5) to display the "Battery Low" to inform the need of charging and the When the battery 6 voltage is slightly lowered and the power is turned off, the speaker 8 emits a pulse signal “beep”, indicating the need for charging.

The above process is described with reference to FIGS. 1 and 2 as follows.

The microcontroller 9 continuously receives the voltage of the battery 6 during operation through the built-in A / D converter 4, converts the data into digital data, and reads and retrieves the digital data. Since the output voltage of the battery 6 input by the A / D converter 4 is a voltage discharged at the maximum charging voltage, the A / D converter 4 changes the output voltage of the battery 6 that changes with time as described above. It converts into hexadecimal digital data and provides it to the CPU (1).

The CPU 1 operates the counter from the first state (11 in FIG. 1) where the voltage of the found battery 6 begins to fall below the standard voltage, which occupies about 80% of the discharge time, and searches for a predetermined time interval. When the third state (13 in FIG. 1) becomes lower than the state (12 in FIG. 1), a pulse signal of 1 KHz is again outputted through the amplifier 7 to indicate the need for charging.

Therefore, the built-in A / D converter 4 in the microcontroller 9 converts the voltage of the discharge state into digital data, so that even when the battery voltage is minutely changed, it can be accurately compared with the reference discharge voltage data stored in the ROM 3. Can be.

The setting data (data 1 to data 3) of the battery voltage stored in the ROM 3 and indicating a discharge state of the battery voltage in the first state to the third state (11 to 13) is stored in the RAM 2 through an experiment. After saving, the emulator is turned and read through the CRT (Cathode Ray Tube) to input when masking ROM (3).

3 is a flowchart illustrating a method of determining a battery discharge state of a portable telephone according to the present invention. Referring to FIG. 3, the processing state of the CPU 1 will be described below.

First, a reference discharge state data is stored in the ROM 3, and a counter for specifying an interval for retrieving the battery value from the start of discharge of the battery 6 is set (100, 110). The voltage of the battery 6 is input into the digital data through the A / D converter 4 and stored in the RAM 2, and the reference discharge voltage data (data 1) stored in the ROM 3 is read, The voltage of the battery stored in the RAM 2 is compared with the voltage of the battery stored in the RAM 2 and the reference discharge voltage (data 1) stored in the ROM 3. The voltage of the battery 6 is inputted through the A / D converter 4 and stored in the RAM 2 until the data becomes smaller than DATA1, and the reference discharge voltage DATA1 of the ROM 3 is read. Repeats the operation (120, 130, 140, 150).

When the battery voltage of the RAM 2 is smaller than the reference discharge voltage data DATA1 of the ROM 3, the set counter is decreased by "1", and the time is delayed until the counter becomes "0" and the counter is decreased. The operation is repeated (160, 170, 180).

When the counter becomes "0" and is delayed for a predetermined time, the reference discharge voltage data DATA2 stored in the ROM 3 is read, and the voltage of the battery 6 is input through the A / D converter 4 to input the RAM ( 2). (190,200).

The voltage of the RAM 2 is compared with the reference discharge voltage data DATA2 of the ROM 3 until the battery voltage of the RAM 2 is equal to the reference discharge voltage data DATA2 of the ROM 3. The operation of inputting the voltage of the battery 6 through the A / D converter 4 and storing it in the RAM 2 is repeated (210).

When the battery voltage of the RAM 2 is equal to the reference discharge voltage data DATA2 of the ROM 3, a signal capable of displaying “Battery Low” is displayed and displayed on the LCD display unit 5. The battery voltage is input through the A / D converter 4, stored in the RAM 2, and the reference discharge voltage data DATA3 is read (220, 230, and 240).

When the battery voltage of the RAM 2 compares the reference discharge voltage data DATA3 of the ROM 3 so that the battery voltage of the RAM 2 becomes smaller than the reference discharge voltage data DATA3 of the ROM 3. Until the battery voltage is input through the A / D converter 4 and stored in the RAM 2, the operation of reading the reference discharge voltage data DATA3 of the ROM 3 is repeated (250).

When the battery voltage of the RAM 2 is smaller than the reference discharge voltage data DATA3 of the ROM 3, the amplifier 7 and the speaker 8 are operated to output a pulse signal of 1 KHz.

Therefore, the present invention made as described above is a digital search for the minute voltage change using the A / D converter, stored in the memory and compared to notify the battery several times as necessary to charge the battery (6) of the portable phone (6) ) Has the effect of eliminating the inconvenience of suddenly disconnecting the call.

Claims (5)

In a portable telephone; An A / D converter 4 which receives the output voltage of the battery 6 as an input and converts it into digital data, and an output of the battery 6 that is converted into a digital value input through the A / D converter 4. RAM 2 for storing the voltage value, RAM 3 for storing the standard voltage level value at the time of normal battery operation and the estimated discharge voltage level value of at least one battery voltage, which are set in advance through experiments; And comparing the output voltage value of the battery 6 which is input through the A / D converter 4 and continuously stored in the RAM 2 with the reference value in the ROM 3 to output a control signal according to battery discharge. Amplifying means (7) for receiving a control signal output by the CPU (1) and the CPU (1) in response to the discharge of the battery (6) output and amplifying the control signal to be output through the speaker (8) as an alarm signal; And the CPU 1 outputs the battery 6 in response to the discharge of the battery 6 output. Is a battery discharge state recognition circuit, characterized in that it comprises an LCD display (5) for receiving a control signal and indicating the discharge state of the battery (6) as a character. CPU 1, which detects a battery discharge state and outputs another control signal, and an A / D converter 4 connected to the CPU 1 to convert the battery voltage state into digital data and input the same to the CPU 1; ), A ROM (3) connected to the CPU (1), a RAM (2) connected to the CPU (1) for storing digital data input from the A / D conversion means (4), and the CPU (1). A method for recognizing a battery discharge state of a portable telephone comprising an LCD display means (5) and an amplification means (7) connected to an output port, and a speaker (8) connected to the amplification means (7); In the first step of storing the reference data in the ROM 3 and setting a counter, the output voltage value of the battery 6 input from the A / D conversion means 4 is inputted and stored in the RAM 2. A second step of comparing and processing the first reference data (data 1) stored in the ROM (3), and inputting battery voltage data from the A / D converter (4) and storing the battery voltage data in the RAM (2); A third step of processing in comparison with the second reference data (data 2) stored in (3); and inputting battery voltage data from the A / D converter (4) and storing it in the RAM (2); Battery discharge state recognition method characterized in that performed by the fourth step of processing compared to the third reference data (data 3) stored in 3). The method of claim 2, wherein the second step comprises: inputting battery voltage data from the A / D conversion means (4), storing it in the RAM (2) and storing the first reference data (data 1) in the ROM (3); ), The battery voltage data stored in the RAM 2 is compared with the first reference data (data 1) stored in the ROM 3 so that the data stored in the RAM 2 is stored in the ROM 3. Repeating the first step until it becomes smaller than the first reference data (data 1) stored in the step; and repeating the step of decrementing and delaying time by "1" until the counter becomes "0". Battery discharge state recognition method, characterized in that carried out by. The method of claim 2, wherein the third step comprises: reading second reference data (data 2) stored in the ROM (3), inputting battery voltage data from the A / D converter (4) to the RAM; (2) storing the data stored in the RAM (2) by comparing the battery data stored in the RAM (2) with the second reference data (data 2) stored in the ROM (3). Repeating the second step until the same as the second reference data (data 2) stored in the step, and outputting a signal to the LCD display means (5) to operate the LCD display portion (5). Battery discharge state recognition method characterized in that. The method of claim 2, wherein the fourth step comprises inputting battery voltage data from the A / D conversion means 4, storing the battery voltage data in the RAM 2, and storing the third reference data (data). 3), the battery voltage data stored in the RAM 2 is compared with the third reference data (data 3) stored in the ROM 3 so that the data stored in the RAM 2 is stored in the ROM 3. Repeating the first step until it is smaller than the third reference data (data 3) stored in the C), and outputting a signal to the amplifying means (7) to output a 1 KHz pulse signal to the speaker (8). Battery discharge state recognition method characterized in that performed by the step.

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