KR0145442B1 - Charging control method of battery charger - Google Patents

Abstract

The present invention relates to a charging control method of a charger in a portable wireless device, and more particularly, to a charging control method for preventing overcharging by detecting a charging capacity of a battery by using a voltage and temperature of a mounted battery.

When the battery is fully charged in the charger, it is charged during the time of detecting the full charge according to the delta voltage or temperature difference, and after the battery is installed in the charger to solve the problem of causing the battery to be overcharged and shortening the life of the battery. When the full charge flag is set, the battery voltage value and the battery temperature value are stored as the full charge set value. When the full charge flag is not set, the stored full charge voltage value and the temperature value are stored from the stored battery. The difference value is detected by subtracting the voltage value and the temperature value, and the difference value for the detected voltage and temperature is compared with the set reference value to determine the full charge state of the mounted battery, and the mounted battery is in the full charge state. If not, charge until it is fully charged, set the full charge flag after charging is completed, and only full charge voltage for a certain time. Storage temperature, and after a certain time has passed does not update the maximum charge voltage and the temperature.

In addition, by reading the state of the battery to be installed next, that is, voltage and temperature and comparing each other with the full charge voltage and temperature, it is possible to distinguish whether the attached battery is a full charge battery or a battery to be charged to prevent overcharging of the battery. Extends battery life

Description

Battery charge control method of charger

1 is a block diagram of a general charging device.

2 is a conventional charging control flowchart.

3 is a charging control flowchart according to the present invention.

* Explanation of symbols for main parts of the drawings

10 battery 12 connector

14 CPU 16 Memory

18: battery voltage sensing unit 20: battery temperature sensing unit

22: A / D converter 24: Battery charge display

26: power supply unit 28: charging path selector

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging control method of a charger in a portable wireless device, and more particularly, to a charging control method for preventing overcharging by sensing a charging capacity of a battery using a voltage and a temperature of a mounted battery.

In general, portable wireless devices are powered by a battery to form a call. In this case, the battery uses a rechargeable battery, which must be charged in a usable state at all times.

1 is a block diagram of a general charging device,

Battery 10,

A connector 12 for coupling and mounting the battery 10;

A battery voltage sensing unit 18 detecting and outputting a voltage of the battery 10;

Battery temperature sensing unit 20 for detecting and outputting the temperature of the battery 10,

An A / D converter 22 for converting and outputting the voltage detected by the battery voltage sensing unit 18 and the temperature detected by the battery temperature sensing unit 18 into digital signals;

CPU 14 for controlling the charging of the battery 10 by sensing the voltage and temperature digitally converted from the A / D converter 22,

A memory 16 connected to the CPU 14 for storing a program for charge control and temporarily storing processing data;

A battery charge display unit 24 which displays a battery charge state by a control signal of the CPU 14,

A power supply unit 26 for inputting AC power to convert DC power to supply a constant voltage;

And a charge path selector 28 for turning on / off the voltage supplied from the power supply 26 under the control of the CPU 14.

2 is a conventional charge control flow chart.

Referring to FIGS. 1 to 2, the conventional charging control operation is described as follows.

In step 101 when the power is turned on, the CPU 14 converts the voltage and temperature detected from the battery voltage sensor 18 and the battery temperature sensor 20 through the connector 12 to the digital converter through the A / D converter 22. The signal is monitored to check that the battery 10 is installed. At this time, if the voltage and temperature digitally converted from the A / D converter 22 are detected and the battery 10 is not mounted, the process proceeds to step 102 and the CPU 14 controls the battery charge display unit 24 to control the battery 10. ) Is not installed, clear the full flag and proceed to step 101 again. However, if the voltage and temperature digitally converted from the A / D converter 22 are detected in step 101 and the battery 10 is installed, the process proceeds to step 103 and the CPU 14 controls the battery charge display unit 24. Indicate that the battery 10 is installed, and proceeds to step 104. In step 104, the CPU 14 checks whether the full charge flag is set and returns to step 101 without charging if the full charge flag is set. However, if the full charge flag is not set in step 104, the CPU 14 controls the power supply unit 26 to supply power after controlling the power supply unit 26, and then controls the charge path selector 28 to control the power supply unit 26. Power supplied from the battery 12 is applied to the battery 10 through the connector 12 to charge the battery 10 and proceeds to step 106. In step 106, the CPU 14 receives the digitally converted signal from the battery voltage sensing unit 18 and the battery temperature sensing unit 20 through the A / D converter 22, In comparison, if the battery 10 is fully charged and is not fully charged, the process returns to step 105 to continue charging. However, if the battery is fully charged in step 106, the CPU 14 controls the charging path selector 28 to cut off the power supplied from the power supply 26 to stop charging and set the full charge flag. Then, in step 108, the CPU 14 controls the battery charge display unit 24 to display the full charge state.

As such, the conventional charging control method always starts charging when the battery is installed and then detects a delta voltage (DELTA VOLTAGE) or a full charge using a temperature difference. Therefore, when a fully charged battery is installed, it depends on a delta voltage or a temperature difference. Charging during the time of detecting the full charge caused a problem of overcharging the battery and shortening the life of the battery.

Accordingly, an object of the present invention is to provide a charging control method of a charger for prolonging the life by preventing overcharging of a battery in a portable wireless device.

Another object of the present invention is to provide a charging control method of a charger that prevents overcharging by sensing a voltage and temperature of a mounted battery to sense a charging capacity of the battery so that the battery is not fully charged.

The present invention for achieving the above object is a process of checking whether the mounted battery is fully charged when the battery is mounted to the charger, and when the mounted battery is in a fully charged state to display the full charge state of the battery When the mounted battery is in a fully charged state, storing the voltage value and the temperature value of the mounted battery as a full charge reference value in the first ram area and the second ram area; and If not, subtracting the voltage value and the temperature value of the mounted battery from the pre-stored full charge voltage value and the temperature value, respectively, detecting the difference value, and comparing the difference value for the detected voltage and temperature with a predetermined reference value. Determining a state of full charge of the mounted battery, and when it is determined that the mounted battery is not in a full charge state, power is supplied to the battery. It is characterized by consisting of a process to charge until fully charged by supply.

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

The block configuration of the charging device according to the present invention is the same as that of the first drawing, and the reference numerals are the same.

3 is a flow chart illustrating a charging control according to the present invention.

Checking whether the mounted battery is fully charged when the battery is mounted in the charger;

Displaying a full charge state of the battery when the mounted battery is in a full charge state.

Storing the voltage value and the temperature value of the mounted battery as a full charge reference value in the first ram area and the second ram area when the battery is fully charged;

Detecting a difference value by subtracting a voltage value and a temperature value of the mounted battery from a pre-stored full charge voltage value and a temperature value when the battery is not fully charged;

Determining a fully charged state of the mounted battery by comparing the difference value of the detected voltage and temperature with a set reference value;

Supplying power to the battery when it is determined that the mounted battery is not in a fully charged state and charging the battery until it is fully charged;

Charging the battery in the charging process is a process of displaying the full charge state when the mounted battery becomes a full charge state.

A preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 and 3 described above.

In step 201, when the power is turned on, the CPU 14 digitally converts the voltage and temperature detected from the battery voltage sensing unit 18 and the battery temperature sensing unit 20 through the connector 12 through the A / D converter 22. The signal is monitored to check that the battery 10 is installed. At this time, if the battery 10 is not installed, the voltage and temperature digitally converted from the A / D converter 22 are not detected. Thus, the CPU 14 proceeds to step 202 to control the battery charge display unit 24 to control the battery ( After indicating that 10) is not installed, the full charge flag is cleared, and all RAM values except the first RAM area and the second RAM area of the memory 16 are cleared, and the flow returns to step 201. However, if the battery 10 is installed in step 201, the voltage and temperature digitally converted from the A / D converter 22 are detected. Thus, the CPU 14 proceeds to step 203 to control the battery charge display unit 24. Indicate that the battery 10 is installed, and proceeds to step 204. In step 204, the CPU 14 checks whether the currently installed battery 10 is fully charged. That is, it is checked whether the full charge flag is set. At this time, if the full charge flag is set, the mounted battery is fully charged, and if the full charge flag is not set, the full charge is not. Then, when the full charge flag is set in step 204, the battery 10 does not start charging and proceeds to step 216. The CPU 14 checks whether the full charge storage time has elapsed and does not elapse the full charge storage time. In operation 217 and 218, the full charge voltage and the full charge temperature of the battery 10 are stored in the first RAM area and the second RAM area of the memory 16, respectively.

However, if the full charge flag is not set in step 204, the CPU 14 checks whether the charging flag is set in step 204a, and proceeds to step 205 if the charging flag is not set, and proceeds to step 211 if the charging flag is set. do.

In step 205, the CPU 14 checks whether there is a value stored in the first RAM area and the second RAM area, and if there is no value stored in the first RAM area, the CPU 14 proceeds to step 212. In step 212, the CPU 14 controls the power supply unit 26 to supply power, and then controls the charging path selector 28 to supply power from the power supply unit 26 to the battery through the connector 12. The battery 10 is charged to 10 and the charging flag is set, and then the process proceeds to step 213. In step 213, the CPU 14 detects the voltage and temperature from the battery voltage sensing unit 18 and the battery temperature sensing unit 20 through the connector 12, and converts the voltage digitally from the A / D converter 22. When the battery 10 is fully charged by comparing the temperature signal with the set value and checking whether the battery 10 is fully charged, the process returns to step 201 to determine whether or not the battery is installed. However, if the battery is fully charged in step 213, the controller 14 proceeds to step 214 to control the charging path selector 28 to interrupt the power supplied from the power supply unit 26 to stop charging and set the full charge flag. Let's do it.

Then, in step 215, the CPU 14 controls the battery charge display unit 24 to display the full charge state, and proceeds to step 216. In step 216, the CPU 14 checks whether the full charge storage time has elapsed. If the full charge time has not elapsed, the CPU 14 sequentially performs steps 217 and 218 to store the full charge voltage and the full charge temperature of the battery 10. The data is stored in the first RAM area and the second RAM area of (16), respectively.

If there is a value stored in the first RAM area and the second RAM area in step 205, the CPU 14 proceeds to step 206. The CPU 14 determines whether data of the first RAM area of the memory 16 is smaller than the first set value ZZ. If it is smaller than the first set value ZZ, the process proceeds to step 207. In step 207, the CPU 14 clears the first RAM area and the second RAM area of the memory 16 and proceeds to step 212. However, if the first RAM area is not smaller than the first set value ZZ in step 206, the CPU 14 proceeds to step 208 and the CPU 14 converts the A / D converter 22 from the value stored in the first RAM area of the memory 16. Subsequently, a voltage difference value is detected by subtracting the voltage of the battery 10 which is currently input, and stored in the third area of the memory 16. In step 209, the CPU 14 detects the temperature difference value by subtracting the temperature of the current battery 10 inputted through the A / D converter 22 from the value stored in the second RAM area to detect the temperature difference of the memory 16. Save to area 4 and proceed to step 210. In step 210, the CPU 14 checks whether the value of the third RAM area of the memory 16 is smaller than the second set value XX and proceeds to step 212 described above if it is not smaller than the second set value XX.

If the third RAM area value is smaller than the second set value XX in step 210, the CPU 14 proceeds to step 211. The CPU 14 determines whether the fourth RAM area value of the memory 16 is smaller than the third set value YY. If it is smaller than the third set value YY, the process proceeds to step 214. However, if the fourth RAM area value is not smaller than the third set value YY in step 211, the process proceeds to step 212.

In step 212, the CPU 14 controls the power supply unit 26 to supply power, and then controls the charging path selector 28 to supply power from the power supply unit 26 to the battery through the connector 12. The battery 10 is charged to 10 and proceeds to step 213. In step 213, the CPU 14 receives the digitally converted signal from the battery voltage sensing unit 18 and the battery temperature sensing unit 20 through the A / D converter 22. In comparison, if the battery 10 is fully charged and is not fully charged, the process returns to step 201 to determine whether or not the battery is installed and is charged. However, if the battery is fully charged in step 213, the controller 14 proceeds to step 214 to control the charging path selector 28 to cut off the power supplied from the power supply unit 26 to stop charging and set the full charge flag. Let's do it.

Then, in step 215, the CPU 14 controls the battery charge display unit 24 to display the full charge state, and proceeds to step 216. In step 216, the CPU 14 checks whether the full charge storage time has elapsed. If the full charge time has not elapsed, the CPU 14 sequentially performs steps 217 and 218 to store the full charge voltage and the full charge temperature of the battery 10. And store in the first RAM area and the second RAM area of (16), respectively.

Here, the first to third set values ZZ, XX, and YY are set differently according to the system to be implemented, and are intended to prevent a malfunction due to full charge of an uncharged battery.

As described above, the characteristics of the rechargeable battery applied to the present invention are shown in Tables 1, 2, and 3 below by a test. In addition, the present invention was implemented to detect full charge, including data as shown in Tables 1, 2, and 3 below.

In addition, the capacity and current of the battery when charging the rechargeable battery is as follows.

LONG BATTERY ⇒ 4.8 V (capacity: 1200 mA),

SLIM BATTERY ⇒ 4.8 V (capacity: 480 mA)

FRONT SLOT ⇒ After full charge, a current of 50 ~ 60mA + 2 ~ 3mA sometimes flows.

After talking about a fully charged battery for 4-5 minutes, the voltage shows 5.25 to 5.3V lower than the stable voltage after full charge. Here, the battery is charged with an unused battery and the voltage difference between the battery and the battery which has been talked for about 4 to 5 minutes is used to determine whether to charge the battery further or recognize the battery as fully charged. In Table 1, 1 is a charge from LONG ⇒ FRONT to check the voltage stabilization time when entering the trickle mode after full charge, and 2 is a charge from SLIM BAT ⇒ REAR SLOT, and the stabilization time of the voltage when entering the trickle mode 3 is for charging from SLIM BAT ⇒ REAR SLOT to check the voltage stabilization time when entering trickle mode, and 4 is for charging from SLIM BAT BAT FRONT SLOT and for stabilizing voltage when entering trickle mode To check. The sudden change in voltage width is a phenomenon caused by the current supply on / off of 50 to 60 mA.

In Table 2, 1 shows the temperature after fully charging the discharged battery to 5.01V, and 2 shows the temperature change range of the battery after full charging at the charging start temperature of 2.553V, and 3 after full charge. The change in temperature is shown.

Table 3 below shows the temperature variation of the battery after fully charging the -4.8 V (current 480 mA) battery.

As described above, when a charger stores a voltage and a temperature of a fully charged battery in a portable wireless device and the battery is mounted to charge, the battery is installed by comparing the voltage and temperature of the mounted battery with the stored full charge voltage and temperature. By controlling the charge by sensing the capacity of the battery, it is possible to prevent overcharging and at the same time to shorten the life of the battery, and also to prevent the battery from becoming defective due to overcharging.

Claims (2)

A method of controlling a battery charge of a charger in a portable wireless device, the method comprising: checking whether the mounted battery is fully charged when the battery is mounted in the charger; and fully charging the battery when the mounted battery is fully charged. Displaying a state, storing the voltage value and the temperature value of the mounted battery as a full charge reference value in the first and second ram regions when the mounted battery is in a fully charged state, and the mounted battery Is not in a fully charged state, subtracting the voltage value and the temperature value of the mounted battery from the pre-stored full charge voltage value and the temperature value, respectively, detecting the difference value, and the difference value for the detected voltage and temperature is set. Determining a fully charged state of the mounted battery by comparing with a reference value, and determining that the mounted battery is not in a fully charged state. The battery charging control method comprising the step of charging the power until it is fully charged by supplying the battery. The method of claim 1, further comprising displaying a full charge state when the mounted battery is charged to a full charge state in the charging process.