KR0119791B1 - Automatic charging device and control method for Ni-MH battery - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charger for a nickel-metal hydride battery. The charger for checking and controlling the external DC input state of the charger, the internal temperature of the battery, the state of change of the internal temperature of the battery, the state of charge of the battery, and the rate of change of voltage during full charge and its It relates to a control method.

Description

Automatic charging device and control method for Ni-MH battery

1 is a configuration circuit diagram of a charging device for a nickel hydride battery according to an embodiment of the present invention,

2 is a state diagram showing the level of the current charged in each charging step according to an embodiment of the present invention,

3 is a flowchart showing a step-by-step control method in the charging device for a nickel hydride battery according to an embodiment of the present invention,

Figure 4 is a flow chart showing the flow of the battery test mode of the control procedure of the charging device for a nickel hydride battery according to an embodiment of the present invention,

Figure 5 is a flow chart showing the flow of the fast charge mode during the control step of the charging device for a nickel hydride battery according to an embodiment of the present invention,

Figure 6 is a flow chart showing the flow of the trickle charge mode of the control procedure of the charging device for a nickel-metal hydride battery according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: AC / DC adapter external power supply 2: Car battery

3: charger external power input terminal 4: DC / DC boost converter

5: constant current source circuit 6: battery connection terminal (charger output terminal)

7: Ni-MH battery pack (8 Cells)

8: Thermistor 9: Charge current control circuit

10: +5 volt regulator 11: Microcomputer

12: light emitting diode (LED) control circuit 13: green light emitting diode (LED)

14: yellow light emitting diode (LED) Z: zener diode

D: Diodes R1, R2, R3, R4, R5: Resistance

BVS: Ni-MH battery voltage line BTS: Ni-MH battery temperature line

IVS: External power supply voltage detection line LCS: Light emitting diode (LED) control signal line

CHG-EN: Charge-Enable Signal Input to Constant Current Source

Q-S *: Quick-Standard Charge Signal Input to Charge Current Control Circuit

TCO: Temperature Cut Off

MCV: Maximum Cell Voltage

The present invention relates to a charging device and a control method for a nickel hydride battery, and more particularly, to a safe automatic charging device for a nickel hydride battery for rapid charging and appropriately controlling the nickel hydride battery.

The present invention is a device for rapidly charging a Ni-MH battery pack used as a power source for notebook computers, cordless telephones, etc. with an external power supply (AC / DC adapter) or a car battery (especially a cigarette lighter socket).

The object of the present invention is to safely charge and conveniently use a nickel metal hydride battery, and if the rechargeable battery temperature range is sufficient, the nickel hydride battery pack can be rapidly charged after a pre-charge regardless of the battery voltage. Ni-MH battery with safe and efficient application of charging device and microcomputer that detects the external power status and battery status and displays the overall charging status with two green and orange LEDs in each charging mode and battery status. It is to provide a control method capable of charging.

As a first means to achieve the above object in FIG. 1, the configuration of the present invention includes an AC / DC adapter external power supply for converting AC power into DC power and inputting the charger, and an external nickel-hydrogen battery autocharger. When the polarity of power input terminal, DC input external power is reversed, Zener diode that prevents adverse effects and removes noise, and AC / DC external power voltage is lower than the rated charge voltage of the battery pack to be charged DC / DC boost converter that raises external power voltage according to charging voltage, constant current source circuit that supplies constant current charging current to battery pack, diode to prevent battery pack discharge, and charge to Ni-MH battery pack terminal A battery supply terminal that supplies current, a nickel metal hydride battery pack, a thermistor for detecting the temperature inside the nickel metal hydride battery pack, The charging current control circuit detects the charging current at both ends of R4 and then controls the constant current source circuit so as to flow a constant current according to the charging rating, and detects the voltage divided between the resistors R1 and R2 for the external DC input voltage of the charger. Find out information about the voltage state of the Ni-MH battery pack by detecting the voltage diverged between the positive terminal of the diode and the battery connection terminal, and between the resistor R5 and the (T) terminal of the battery connection terminal. After detecting the branched voltage to find out the temperature inside the Ni-MH battery pack, based on these data, charge and heavy electric current control circuits (chg-en and QS *) are applied to the constant current source circuit and the charge current control circuit. In addition, the microcontroller sends an LED control signal to the LED control circuit to control the entire Ni-MH battery charging circuit, and an external DC power supply is used as an input source. It consists of a +5 volt regulator that supplies one voltage, an LED control circuit that receives the LED control signal from the microcomputer and controls the green LED and the yellow LED according to the charging status, and an LED that enables the naked eye to check all the charging status. have.

As the second means for achieving the above object in FIG. Zener diodes to prevent adverse effects and reverse noise when reversed, DC / DC boost converters to boost external power voltages when the battery voltage of automobiles is low, and constant current sources to supply constant current charging current to battery packs. Circuits, a diode to prevent discharge of the battery pack, a battery connection terminal for supplying charging current to the Ni-MH battery pack terminals, a thermistor for detecting temperature inside the Ni-MH battery pack and the Ni-MH battery pack, Charge current control circuit that detects charging current across resistor R4 and controls constant current source circuit to flow constant current according to charging rating Detect the voltage divided between the resistors R1 and R2 to obtain information about the external DC input voltage of the charger, and detect the voltage branched between the positive terminal of the diode and the battery connection terminal to detect the voltage of the Ni-MH battery pack. After finding information about the voltage status, detecting the voltage branched between the resistor R5 and the (T) terminal of the battery connection terminal to find information about the temperature inside the Ni-MH battery pack, and then Microcomputer that outputs charging and charging current control signals (CHG-EN and QS *) to the circuit and charging current control circuit, and also sends LED control signals to the LED control circuit to control the entire Ni-MH battery charging circuit, and external DC +5 volt regulator that supplies constant voltage to the microcomputer by using power as input source, and receives green LED and yellow LED according to the charging status by receiving LED control signal from microcomputer. The LED control circuit, and all the charge that consists of a LED to check with the naked eye.

In FIG. 3, as a means for achieving the above object, the configuration of the control method according to the present invention includes a charging start step 31 which loops as the first starting point of the flowchart and whether the DC external input voltage is higher than 9 volts. Step 32, determining whether the DC external input voltage is higher than 6 volts, clearing all flag and RAM data, clearing step 38, and temporarily stopping charging. Setting the mode and flashing the green LED, then returning to the first stage of charging, turning the loop (35), determining whether the DC external input voltage is lower than 17 volts (36), and sensing the temperature Determining whether the terminal voltage is lower than 4.5 volts (37), clearing all charge mode flag (38), storing (39) previous charging condition data, and temperature sensing voltage of 4.5 Determining whether it is lower than volts 40, and all charging modes Flag Creeping (41), all charge-stopping modes and green LEDs lit, then returning to the initial charging stage (42) turning the loop, and whether the battery internal temperature is higher than 5 ° C. (43) determining whether the battery is first charged, setting the battery damage flag (Flag) and blinking the yellow LED (45), and determining whether the battery is first charged. (46), determining whether the battery internal temperature is lower than 40 ° C. (47), determining whether the battery is fully charged (48), determining whether the battery is damaged (49), and first damaged Determining whether the battery has been determined as a battery (50), setting the battery for 25 minutes in the pre-charge mode and pre-charging the battery (51), and setting the battery in the damaged state mode and turning yellow After flashing the LED, go back to the first step Fig. 52, the step 53 of determining whether the charging state is set to the temporary stop mode from the state of charge before turning the loop, the step 54 of returning to the previous state of charge, and the temporary stop mode flag are cleared. Returning to the start of the initial charging, turning the loop 55, determining whether it is set to the battery test mode in the state of charge before turning the loop, and setting the battery test mode and rotating the battery Checking (57), determining whether the fast charging mode is set before turning the loop (58), setting the fast charging mode and turning the loop rapidly (59), and trickle charging mode It consists of a step (60) of charging trickle while setting the loop.

In FIG. 4, as a detailed means for achieving the above object, the configuration of the battery test step as a sub-routine in the control method according to the present invention comprises the steps of: setting to 57 the battery test mode; A step 571 for determining whether the battery test is higher than the MCV, a step 572 for clearing the battery test flag and setting a full charge flag, and a step 573 for determining whether the battery internal temperature is higher than 50 ° C; A step 574 of determining whether the battery test time has elapsed more than 5 minutes, a step 575 of determining whether the battery voltage is lower than 8 volts, a step 576 of setting a battery damaged state flag, and a loop This is followed by a step 31 of going back to the beginning of the first charge.

In FIG. 5, as a detailed means for achieving the above object, the configuration of the rapid charging step as a subroutine in the control method relating to the present invention includes the step 59 of setting the fast charging modules, and the battery voltage being higher than the MCV of the fast charging. A step 591 for determining a high value, a step 592 for clearing a fast charge mode flag and setting a full charge mode flag, a step 563 for determining whether a battery internal temperature is higher than 55 ° C, and rapid A step 596 for determining whether it is a time point every three minutes after the start of charging, a step 597 for determining whether the timer time expires, and a start of charging 31 going back to the loop for the first time.

The configuration of the trickle charge step as a subroutine in the control method according to the present invention as a detailed means for achieving the above object in Figure 6, the step 60 of setting the trickle charge mode (Trickle charge mode), and the battery internal temperature Determining whether the temperature is higher than 55 ° C. (601), disabling the off time counter (stop) and completely stopping the trickle charge (602), and trickle charge off time (59.5 seconds). Determining whether this has elapsed (603), loading the off time counter value (Off Time Counter Value Load) and enabling trickle charging (0.5 seconds) (604), and reducing the off time counter. It is composed of a gksms step 605 of the reduction and trickle charge discharging (59.5 seconds), and a charging start step 31 of going back to the loop for the first time.

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

1 is a circuit diagram of a nickel-metal hydride battery charger according to an embodiment of the present invention. First, when DC power is supplied from the AC / DC adapter external power supply 1 to the charger external power input terminal 3, the power is noisy. When the DC polarity is changed and the DC polarity is changed, the external input voltage detection terminal (IVS) of the DC / DC boost converter (4) DHK and the microcomputer (11) passes through the branch point of the zener diode (Z), which prevents the adverse effect on the charger. It is input to the 5-volt regulator 10 and the LED control circuit 12.

The DC / DC boost converter 4 operates to raise the external power supply voltage to match the charging voltage when the external input power supply voltage is low.

The power boosted by the DC / DC boost converter 4 is input as a constant current to the (+) terminal of the battery connection terminal 6 through the resistor R4 and the backflow prevention diode D in the constant current source circuit 5. Here, the constant current source circuit 5 allows the nickel hydride battery pack 7 to be charged with a constant current.

Then, the charging current control circuit 9 receives the control command QS * from the microphone 11 and controls the constant current source circuit 5 to accurately detect the flow of the charging current across the resistor R4, thereby accurately matching the charging rating. It serves to flow constant current.

In addition, the thermistor 8 present in the Ni-MH battery pack 7 is for detecting the battery internal temperature, and is connected to R5 so that the detected voltage data is branched at the (T) end of the battery connection terminal 6. It is input to the microcomputer through the data line BTS.

In particular, the +5 volt regulator 10 supplies a constant +5 volt power supply Vdd to the microcomputer 11 using an external DC power supply as an input source.

In this charger, the most important microcomputer 11 detects the voltage divided from the data line IVS branched between the resistors R1 and R2 to obtain information about the charger's external DC input voltage, and connects the diode D to the battery. The voltage is detected from the data line BVS branched between the positive ends of the terminal 6 to obtain information on the voltage state of the nickel metal hydride battery pack 7, and the resistor R5 and the battery connection terminal 6 After detecting the voltage from the data line BTS branched between the (T) stages to obtain information on the temperature inside the Ni-MH battery pack 7, the constant current source circuit 5 and the charging current are based on these data. The charging and charging current control signals CHG-EN and QS * are sent to the control circuit 9, and the LED control signal LCS is sent to the LED control circuit 12 to control the entire Ni-MH battery charging circuit. Do it. Here, in particular, the CHG-EN and QS *, the charge control signals, are commands to control whether or not the charging current flows to the battery, and the QS * signal is set to the battery test mode. Command to control whether it is in fast charging mode or fast charging mode.

The light emitting diode control circuit 12 is a circuit which receives the LCS signal from the microcomputer 11 and controls the green LED 13 and the yellow LED 14.

Finally, the green LED 13 and the yellow LED 14, which are the LED display units, are combined with the two LEDs according to the state of charge by the LED control circuit 12 to emit light.

Here, looking at the specific LED operation according to the state of charge, when the rated DC input power is applied to the charger, the green LED 13 is turned on, the charger is in the battery test mode (57) or quick charge mode (59) At that time, the yellow LED 14 lights up. When the trickle charge mode 60 or the battery is removed from the charger, the yellow LED 14 is turned off and only the green LED is turned on. In addition, when the external DC input voltage is out of the rated input range or the battery temperature is not in the range, the green LED 13 flashes. That is, only green blinks at the upper side of the temporary stop mode. If the battery is in a damaged state, the yellow flashes.

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

1 is a circuit diagram of a nickel-metal hydride battery charger according to an embodiment of the present invention. First, when DC power is supplied from the vehicle battery 2 to the charger external power input terminal 3, the power source removes noise and the DC polarity. In this case, the DC / DC boost converter 4, the external input voltage sensing terminal IBS of the microcomputer 11, and the +5 volt regulator 10 cross the branch point of the zener diode Z, which prevents adverse effects on the charger. And input to the LED control circuit 12.

The DC / DC boost converter 4 operates to raise the external power supply voltage when the external input power supply voltage is low.

The power boosted by the DC / DC boost converter 4 is input as a constant current to the positive terminal of the battery connection terminal 6 through the resistor R4 and the backflow prevention diode D in the constant current source circuit 5.

Here, the constant current source circuit 5 allows the nickel hydride battery pack 7 to be charged with a constant current.

Then, the charging current control circuit 9 receives the control command QS * from the microcomputer 11 while continuously detecting the flow of the charging current across the resistor R4, and controls the constant current source circuit 5 to meet the charging rating. It serves to flow constant current.

In addition, the thermistor 8 existing inside the Ni-MH battery pack 7 is for detecting the battery internal temperature and is connected to the resistor R5 so that the detected voltage data is branched at the (T) end of the battery connection terminal 6. It is input to the microcomputer through the data line BTS.

In particular, a constant +5 volt power supply Vdd is supplied to the microcomputer 911 by using an external DC power supply of the +5 volt regulator 10 as an input source.

In this charger, an important microcomputer 11 detects the voltage divided from the data line IVS branched between the resistors R1 and R2 to find out information about the charger's external DC input voltage, and connects the diode D to the battery. The voltage is detected from the data line BVS branched between the positive ends of the terminal 6 to obtain information on the voltage state of the nickel metal hydride battery pack 7, and the resistor R5 and the battery connection terminal 6 After detecting the voltage from the data line BTS branched between the (T) stages to obtain information on the temperature inside the Ni-MH battery pack 7, the constant current source circuit 5 and the charging current are based on these data. The charging and charging current control signals CHG-EN and QS * are sent to the control circuit 9, and the LED control signal LCS is sent to the LED control circuit 12 to control the entire Ni-MH battery charging circuit. Do it. Here, in particular, when the charge control signals CHG-EN and QS * are examined, the CHG-EN signal is a command to control whether or not the charging current flows to the battery, and whether the QS * signal is in the battery test mode. Or it is a command to control whether to enter fast charge mode.

The light emitting diode control circuit 12 is a circuit which receives the LCS signal from the microcomputer 11 and controls the green LED 13 and the yellow LED 14.

Finally, the green LED 13 and the yellow LED 14, which are LED display units, emit light by combining the two LEDs according to the state of charge by the control circuit 12.

Here, looking at the specific LED operation according to the state of charge, when the rated DC input power is applied to the charger, the green LED 13 is WJAEMDD, and the charger is in the battery test mode (57) or quick charge mode (59) At that time, the yellow LED 14 lights up. When the trickle charge mode 60 or the battery is removed from the charger, the yellow LED 14 is turned off and only the green LED 13 is turned on. In addition, when the external DC input voltage is out of the rated input range or the battery temperature is not in the range, the green LED 13 flashes. That is, only the green LED 13 blinks in the state corresponding to the temporary stop charging mode 35. If the battery is in a damaged state, the yellow LED 14 flashes.

Another embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The flowchart of FIG. 3 continues to operate in a loop regardless of whether the battery is inserted into the charger unless the external DC power source is disconnected from the charger.

First, when the external DC input power is supplied to the charger, the first start point of the flowchart goes to the charging start step 31 which loops, and the step 32 to determine whether the DC external input voltage is higher than 9 volts, If it is higher than 9 volts, go to step 36 to determine if the DC external input voltage is lower than 17 volts, and if it is lower than 9 volts, go to step 33 to determine whether the DC external input voltage is higher than 6 volts. If it is lower than 6 volts, go to step 34 to clear all flag and RAM data, and if the DC external input voltage is higher than 17 volts in the previous step, sense the temperature. Go to step 40 to determine if the terminal voltage is lower than 4.5 volts, and if higher than 4.5 volts, go to step 38 of clearing all charge mode flags, and at the previous step the DC external input voltage is 17 volts. If lower, the temperature sensing voltage is 4.5 Volts Go to step 40 to determine if it is low, and if higher than 4.5 volts, go to step 41 of clearing all charge mode flags, then go to all stop mode and turn on the green LED and then charge for the first time. Going back to the beginning and going to the step 42 of turning the loop, if the temperature sensing terminal voltage is lower than 4.5 volts in the previous step, determining whether to charge for the first time when the battery internal temperature is lower than 5 ° C. Go to (44), if it is not the first charge, go to step (45) to set the battery damage flag (Flag) and flash the yellow LED; Go to step 47, where the internal temperature of the battery is higher than 40 ° C, when the DC external input voltage is higher than 17 volts in the previous step, the temperature sensing terminal voltage is lower than 4.5 volts, My battery in step When the negative temperature is lower than 5 ° C, for the first charge and for the non-first charge, if the battery damage status flag is set, then go to step 39 of storing previous charge condition data. In the case of saving the charging condition data, clearing all flags and PAM data in the previous step, and clearing all the charging mode flags when the temperature sensing terminal voltage is higher than 4.5 volts in the previous step, then temporarily charging stops. After setting the mode and flashing the green LED, go back to the first stage of charging start and go to the loop (35), in the previous stage when the battery internal temperature is higher than 5˚C If the internal temperature is lower than 40 ° C., go to step 48 to determine if it is full charged, and if not to go to full, go to step 49 to determine if the battery is damaged, If it is determined that the battery is damaged, go to step 50 to determine whether the battery is first damaged, and if it is determined that the battery is damaged first, set it to the Pre-Charge mode for 25 minutes and check the battery ( Go to Pre-Charge, go to step 51, check the battery for 25 minutes. If it is not the first time that the battery is damaged in the previous step, set it to the battery damaged mode and flash the yellow LED. Returning to the first step of the rechargeable operation and going to the step 52 of turning the loop, if it is not determined that the battery is damaged in the previous step, determining whether it has been set to the pause mode in the state of charge before turning the loop (53). ), Then immediately clear the Suspend charge mode flag, return to the beginning of the first charge and go to the EHMS stage 55, setting the suspend mode in the previous stage. If not, if it is set to the battery test mode before turning the loop, go to step 58 to determine whether it is set to the battery test mode and set to the fast charge mode before turning the loop, If it is set in the fast charge mode in the previous step, go to the fast charge mode (59) by setting the fast charge mode and rotating the loop, and the setting in the fast charge mode and when the battery is in the full charge state in the previous step If it does not, the operation goes to step 60 of setting the trickle charging mode and trickling charging the loop.

Referring to the fast charging operation as a subroutine of FIG. 3 in FIG. 5, first, the process proceeds to the step 59 of setting to the fast charging mode, and to step 591 to determine whether the battery voltage is higher than the MCV of the fast charging. If it is lower than the MCV of the fast charging, go to step 593 to determine whether the internal temperature of the battery is higher than 55 ° C, and if the battery endurance temperature is lower than 55 ° C, every 3 minutes after the start of the fast charging Go to step 594 to determine if the temperature has been changed at every 3 copies, and go to step 595 to determine if the temperature change is greater than 3 ° C every three minutes, and the temperature change is 3 ° C. If less, go to step 596 to determine if the voltage drop every three minutes is greater than 15 millivolts, and if the voltage drop is less than 15 millivolts, and not every three minutes after the start of rapid charging in the previous stage. In step 597, it is determined whether the timer time has expired. , When the timer time expires, when the battery voltage is lower than the fast-charge MCV at all stages, when the temperature inside the battery is lower than 55˚C, when the temperature change is more than 3˚C per 3 times, and every 3 If the voltage drop per minute is 15 millivolts or more, go to step 592 of clearing the fast charge mode flag and setting the full charge mode flag, clearing the fast charge mode flag and setting the full charge mode flag; If it does not time out, the loop goes back to the first charging start step 31.

Referring to the trickle charge operation as a subroutine of FIG. 3 in FIG. 6, the flow goes to the step 60 of setting the trickle charge board, and then to step 601 to determine whether the battery internal temperature is higher than 55 ° C. If higher than ˚C, go to step 602 to disable the Off Time Counter and completely stop trickle charging; if the battery internal temperature is lower than 55˚C, trickle charge off Go to step 603 to determine whether the time (59.5 seconds) has elapsed, and when the trickle charge off time has elapsed, load the off time counter value (Off Time Counter Value Load) and enable trickle charge (05ch). Go to step 604 to enable, go to step 605 to trickle charge (59.5 seconds) in the previous step, reduce the off time counter in the previous step, disable trickle charge, and off time in the previous step. To load the counter value Enable, disable the off-time counter in the previous step and completely stop trickle charging, then go back to the loop and go to the first charging start step 31.

As described above, the present invention is a safe and automatic charging of the Ni-MH battery pack, and displays the state of charge by LED light emitting, the input voltage of the charger is out of the rated input range or the temperature range of the battery pack internal temperature can be charged When it's off, there is an advantage in that the charger and Ni-MH battery can be used most efficiently by stopping and recharging temporarily.

Claims (6)

The AC / DC adapter external power supply (1), which converts AC power to DC power and inputs it to the charger, the external power input terminal (3) of the Ni-MH battery charger, and the external power supply that is DC input Zener diode (Z) that prevents adverse effects and eliminates noise when reversed, and DC that raises the external power supply voltage to match the charging voltage when the AC / DC external power supply voltage is lower than the rated charging voltage. / DC boost converter (4), a constant current source circuit (5) for supplying a constant current charging current to the battery pack, a diode (D) to prevent discharge of the battery pack, and supplying a charging current to the Ni-MH battery pack terminal The battery connection terminal (6), the Ni-MH battery pack (7), the thermistor (8) for detecting the temperature inside the Ni-MH battery pack, and the charge current across the resistor R4 and then control the constant current circuit. By Charged current control circuit 9 for flowing a constant current according to the full rating, +5 volt regulator 10 to supply a constant power to the microcomputer using an external DC power source as an input source, and branched between the resistors R1 and R2 Detects the voltage divided by the data line to find out information about the external DC input voltage of the charger, and detects the voltage from the data line branched between the positive terminal of the diode and the battery connection terminal to detect the voltage of the nickel hydride battery pack. After finding information about the condition, detecting voltage from the data line branched between resistor R5 and the (T) terminal of the battery connection terminal, and obtaining information about the temperature inside the Ni-MH battery pack, The charge and charge current control signals (CHG-EN and QS *) are sent to the constant current source circuit and the charge current control circuit, and the LED control signals are sent to the LED control circuits. A microcomputer 11 for controlling the entire battery charging circuit, an LED control circuit 12 for receiving a LED control signal from the microcomputer and controlling the green LED and the yellow LED according to the state of charge with an external DC power supply having a voltage drop at R3; Ni-MH battery automatic charging device, characterized in that consisting of LED (13, 14) to check all the state of charge with the naked eye. Prevents adverse effects when the vehicle battery (2) between DC 9 volts and 17 volts, the external power input terminal (3) of the Ni-MH battery pack autocharger, and the external power supply that is DC input are reversed, and noise Zener diode (Z) for removing the battery, DC / DC boost converter (4) for raising the external power supply voltage when the battery voltage (2) for the vehicle is low, and constant current for supplying a constant current charging current to the battery pack The original circuit 5, a diode D for preventing the battery pack from being discharged, a battery connection terminal 6 for supplying a charging current to the nickel hydride battery pack terminal, a nickel hydride battery pack 7 and nickel hydride A thermistor (8) for detecting the temperature inside the battery pack, a charging current control circuit (9) for controlling the constant current source circuit to flow a constant current after charging the current through the resistor R4, and controlling the constant current source circuit; Do not use DC power as an input source Detects the voltage divided by the +5 volt regulator 10 which supplies a constant voltage to the IC, and the divided voltage from the data line branched between the resistors R1 and R2 to find out information about the external DC input voltage of the charger, and connects the diode and the battery Detects the voltage from the data line branched between the positive terminal of the terminal to find out the information about the voltage state of the Ni-MH battery pack, and the voltage from the data line branched between the resistor R5 and the battery connection terminal (T). Detects the temperature of the inside of the Ni-MH battery pack, and then sends charging and charging current control signals (CHG-EN and QS *) to the constant current source circuit and charging current control circuit based on these data. The microcomputer 11 controls the entire Ni-MH battery charging circuit by sending an LED control signal for controlling the LED according to the charging state, and the LED control signal from the microcomputer. LED control circuit 12 for controlling the green LED and the yellow LED according to the state of charge, and LEDs 13 and 14 for visually confirming all the state of charge. Automatic charging device for nickel hydride battery characterized in. A charging start step 31 of turning the loop as the first starting point of the flowchart, determining whether the DC external input voltage is higher than 9 volts, and determining whether the DC external input voltage is higher than 6 volts (33). ), Clearing all flags and RAM data (34), setting the charge stop mode and flashing the green LED, then looping back to the initial charge start (35), and DC external input A step 36 for determining whether the voltage is lower than 17 volts, a step 37 for determining whether the temperature sensing terminal voltage is lower than 4.5 volts, a clearing of all charge mode flags step 38, and previous charge condition data Storing (39), determining whether the temperature sensing voltage is lower than 4.5 volts (40), clearing all charge mode flags (41), and turning all green mode off and turning on the green LED first. Start charging Returning to the loop (42), determining whether the internal temperature of the battery is higher than 5 ° C (43), determining whether to charge for the first time (44), setting the battery damage status flag and turning on the yellow LED A step of flashing 45, a step 46 of determining whether the battery is first charged, a step 47 of determining whether the battery internal temperature is lower than 40 ° C, a step 48 of determining whether the battery is fully charged, and Determining whether the battery is damaged (49), determining whether the battery is first damaged (50), and setting the battery for 25 minutes in the pre-charge mode and pre-charging the battery. Step 51, setting the battery in a damaged state mode and flashing the amber LED, then returning to the first step of charging, turning the loop 52, and setting it to the charge stop mode from the state of charge before turning the loop. A step 53 of determining whether the connection has been made; Returning to the state (54), clearing the temporary charge stop mode flag, returning to the initial charge start (55) and looping, and determining whether it has been set to the battery test mode in the state of charge before turning the loop. Step 56, setting the battery test mode and checking the battery by turning the loop 57, determining whether the fast charging mode is set before turning the loop 58, and setting the fast charging mode. And a fast charging step (59) while rotating the loop, and setting in the trickle charge mode and performing a trickle charge while rotating the loop (60). 4. The method of claim 3, further comprising: setting the battery test mode (57), determining whether the battery voltage is higher than the battery test MCV (571), clearing the battery test flag, and setting the full charge flag (572). ), Determining (573) whether the internal temperature of the battery is higher than 50 ° C, determining (574) whether the battery test time has elapsed for more than 5 minutes, and determining whether the battery voltage is lower than 8 volts. 575, a step 576 of setting a battery damage state flag, and a step 31 of turning to a first charge start by turning the loop, thereby providing a sub-routine of battery inspection. Control method. 4. The method of claim 3, further comprising the step 59 of setting the fast charge mode, determining whether the battery voltage is higher than the MCV of the fast charge, 591, clearing the fast charge mode flag and setting the full charge mode flag. A step 592, a step 593 for determining whether the battery internal temperature is higher than 55 ° C, a step 594 for determining whether every three minutes has elapsed since the start of rapid charging, and a temperature change every 3 minutes A step 595 for determining whether or not a degree is greater than or equal to 5 ° C, a step 596 for determining whether the voltage drop every three minutes or more is 15 millivolts, a step 597 for determining whether the timer time expires, and a loop Charging apparatus control method for a nickel-metal hydride battery, characterized in that the charging start step (31) to go back to the first routine of the battery inspection. 4. The method of claim 3, wherein the step 60 is set in the trickle charge mode, the step 601 of determining whether the battery internal temperature is higher than 55 ° C., and the off time counter are disabled. And completely stopping the trickle charge (602), determining whether the trickle charge off-scene (59.5 seconds) has elapsed (603), loading the off time counter value (Off Time Counter Value Load) and performing trickle charge ( Enabling 0.5 seconds), reducing the off-time counter and disabling trickle charge (59.5 seconds) (605), starting charging the first time around the loop. The method of controlling a charging device for a nickel hydride battery, characterized in that the step (31) consists of a sub-routine of the battery test.