KR20010045731A - Battery charging circuit and control logic - Google Patents

Abstract

PURPOSE: A battery charging circuit and charging control circuit is provided to achieve an improved charging efficiency and reduce charging time, while preventing undercharge or overcharge of battery. CONSTITUTION: A control transformer(TL) has the first coil(L1-L2) both ends of which are connected to an AC input and an input terminal of a leakage transformer(TM), and a control terminal(C2) connected to an intermediate tap(t0) of the first coil of the leakage transformer. The first coil of the leakage transformer is divided into two sections, and three taps including an upper tap(t), intermediate tap(t0) and a lower tap(t1') are sequentially drawn from the coil start point and connected to a terminal of a triac(S1,S0,S1'). The other terminal of the triac is connected in common to a control terminal(C1) of the control transformer, and triac has a gate terminal connected to the output terminal of the control circuit. A dummy transformer(Rd) is connected between control terminals of the control transformer.

Description

Charger circuit and its charge control circuit {BATTERY CHARGING CIRCUIT AND CONTROL LOGIC}

The present invention provides a battery charger circuit and its charging control circuit capable of automatically compensating for this by detecting a fluctuation range even when the AC input voltage is changed or the output current is changed according to the rise of the battery voltage when the battery is being charged. CONTROL LOGIC) In more detail, in the quasi-constant voltage charging method using a conventional leakage transformer, a cycle transformer that can maintain a constant output current at the beginning of charging and a constant charging voltage at the end of a charger using a control transformer and a triac. The present invention relates to a charge control circuit that applies a control signal to a circuit and a power device of the circuit to adjust a charge amount or a charge voltage step by step, and detects a full charge state to end charging.

When charging the battery for electric vehicles, which are mainly used as a power source for driverless cars, golf carts, sweepers, and electric forklifts, the quasi-voltage charger adopts a quasi-constant voltage charger that is relatively inexpensive due to its simple circuit and easy to maintain. As shown in FIG. 1, the terminal voltage of the battery increases as charging progresses and the charging current begins to decrease (referred to as recovery battery). Does not rise anymore and is almost constant. Therefore, when charging with a conventional quasi-voltage charger, if the charging input voltage rises by about 5%, the charging current flowing into the battery increases rapidly by more than two times at the end of charging, but the increased current is mostly due to the internal resistance of the battery. As heat is generated and distilled water is evaporated due to this heat, the battery becomes overcharged, and thus, the charging efficiency is lowered and the battery is damaged or the life of the battery is shortened. On the contrary, when the charging input voltage is low, the charging current is sharply reduced, so that even if it is charged for a long time, the battery cannot be fully charged, resulting in a state of insufficient charging. In addition, when the input voltage is increased during the recovery charger, the charging current is increased and the liquid temperature is excessively increased. When the input voltage is low, the charging current is decreased, resulting in insufficient charging or a long time to be charged.

Since the charging voltage during the charging period greatly influences the charging characteristics, it is necessary to supply the voltage and the current between the chargers according to the charging characteristics according to the variation of the AC input voltage and the charging amount. Similarly, taps corresponding to + 10%, + 5%, -5%, and -10% of the rated input voltage and the AC input power supply are usually on the primary side of the leakage transformer (TM) of the quasi-constant voltage charger in order to cope with variations in the AC input voltage. Connect the magnetic contactor in between, and when the AC input voltage changes, turn ON the magnetic contactor connected to the corresponding input voltage tap (for example, if the AC input voltage is + 10% higher than the rated voltage, connect it to the + 10% tap). In order to reduce the voltage difference between taps, it is necessary to connect several magnetic contactors to the corresponding tap of the transformer primary winding in order to reduce the voltage difference between taps. There was a downside to that is complicated and manufacturing cost increases.

In addition, the SCR phase control method, which is commonly used in recent years, may be used for charging a DC emergency power supply. The charging characteristic is excellent, but an additional filter choke is required because the ripple current is increased by the phase control. The need for additional electronic control circuits such as feedback control circuits and SCR phase control circuits has the disadvantages of complicated and expensive circuits, difficult maintenance and increased maintenance costs.

1 is a change in charge specific gravity temperature with charge time in a quasi-constant voltage charger.

2 is a main circuit diagram of a conventional quasi-constant voltage charger.

3 is a single phase main circuit diagram of the present invention;

4 is a graph showing the charge current and the charge amount of the present invention

5 is a three-phase main circuit diagram according to another embodiment of the present invention.

6 is a control circuit block connection diagram of the present invention.

7 to 8 are flowcharts of the MPU built-in program of the present invention.

9 is a signal waveform of the control input and output in FIG.

The present invention relates to the improvement of patent No. 172162 (cycle charger circuit) in order to solve such a conventional problem.

A control transformer is connected in series to the primary side of the leakage transformer (TM) of the quasi-constant voltage charger, and the secondary coil of the transformer is divided into two by dividing the primary coil of the leakage transformer (TM) through a triac (two-way control element). When connected to each of the three taps (t ₁ , t ₀ , t ₁ '), the output voltage of the charger is reduced by the conduction of the corresponding triac, and the primary voltage of the leakage transformer (TM) corresponds to the AC input voltage. It is kept the same as when the taps are switched. Furthermore, the phase voltage of Triac S _1, So or S ₁ 'can be controlled stepwise to further control the charging voltage and current so that the charging current and The charging amount is adjusted as shown in FIG. 4 to enable optimal charging, which will be described in detail with reference to FIG. 3 as follows.

When the AC input voltage allowable range of the primary leakage voltage (V _R ) of a known leakage transformer (TM) is ± N% (typically ± 10%), the rated voltage is set to V _R × N% and the primary winding Both ends of the primary windings (L ₁ -L ₂ ) of the control transformer (TL) designed with the winding ratio between (L ₁ -L ₂ ) and the control winding (C ₁ -C ₂ ) are N: 50, respectively, AC input and leakage It is connected to the transformer (TM) input terminal, the control terminal (C ₂ ) is connected to the primary winding central tap (to) of the leakage transformer (TM), and the primary winding of the leakage transformer (TM) is divided into two parts and wound. (3) taps (upper tap t ₁ , middle tap to, lower tap t ₁ ') are additionally drawn from the starting point and connected to one terminal of the triac (S ₁ , So, S ₁ ') and the other side of the triac All the terminals are connected in common, and this circuit is connected to the control terminal C ₁ of the control transformer TL. At this time, the pseudo load (Rd) is installed between the control terminals (C ₁ , C ₂ ) so that the triac is all turned off, and the leakage transformer (TM) is used when the primary winding of the control transformer (TL) acts as an inductor with an iron core. It is to make a role to make the load current of flow smoothly. The cycle charger circuit configured as described above senses the charging current step by step so that the triacs S ₁ , So, and S ₁ ′ are appropriately conducting and phase-controlled so that the charging current is constant during the recovery charging period before the electrode voltage. In this case, the operation principle of the main circuit composed of the leakage transformer (TM), the control transformer (TL) and the triac is briefly described as follows.

If the charging current is higher than the set rated charging current, the high AC input voltage is applied to the leakage transformer TM through the control transformer TL, so the triac selection signal generated from the charging control circuit causes the gate drive 2 to operate. Through the triac S ₁ connected to the upper tap t ₁ , the voltage of the control winding C ₁ -C ₂ of the control transformer TL becomes equal to the voltage between to and t ₁ of the primary coil of the leakage transformer TM. Therefore, between the primary coils L ₁ -L ₂ of the control transformer TL, a voltage of N% is induced in the direction of decreasing with the AC input voltage. For example, if the winding ratio of the control transformer (TL) is 10:50, if the AC input voltage is higher than + 10%, the triac S ₁ conducts in 100% period during half cycle of the commercial frequency, and if it is higher than + 5%, the triac the S ₁ windings to the control transformer (TL) to the conduction cycle 50% - is reduced in the transformer control by 10% or 5% of the rated voltage by the role of the _{(L 1 L 2) (TL} ), the AC input voltage fluctuates Even if the leakage transformer (TM) is able to maintain a constant output in stages. In the above, the case in which the conduction is conducted at 50% cycle is described. However, if the conduction angle of the triac is appropriately subdivided in stages, phase refinement can be maintained.

Conversely charged when the current is lower than the rated charge current value is set, the AC input voltage is so lower than the rated voltage hataep (t ₁ ') TRIAC S ₁ is connected to the "a conduction or phase control, the control transformer (TL) 1 difference In the windings L ₁ -L ₂ , a voltage of N% is induced in the direction in which the AC input voltage is added, so that the leakage transformer TM can maintain a constant output.

Although the above description is limited to the case where the charger input is single-phase, even when the charger input is three-phase, three pairs of single-phase main circuits of FIG. 3 are operated in the same manner. However, in this case, the control winding and the triac ( Since S ₁ , So, S ₁ ′) and three related drive circuits 2 are required to be complicated, respectively, as shown in FIG. 5, the S phase installs only the primary winding of the control transformer TL so that both ends thereof are installed. When connected between AC input and leakage transformer (TM), the control transformer (TL) is a three-phase open delta (△) connection, so the voltage of S phase of the control transformer (TL) is equal to the vector voltage [TL (R)] of R phase. It is equal to the sum of the vector voltage [TL (T)] of the T phase, and therefore, the control winding of this aspect is adjusted by installing control windings only on the R and T phases of the control transformer TL to control the primary phase of the S phase. Voltage can also be kept stable.

In the charger circuit of FIGS. 3 and 5 configured as described above, as described above, the triacs S ₁ , S ₀ , and S ₁ ′ are selected to conduct, phase control, and detect a full charge state as the charging proceeds. The charging control circuit of FIG. 6 which terminates charging by turning off the switch SW is demonstrated.

When connecting 48V, 24V or 72V of the battery to CN2-7 and CN2-9 of Fig. 6, the battery voltage is supplied to the known power supply input terminal of Figs. Supplies DC 12V (VDD) and DC 5V (VCC) to the control circuit, and the charging control circuit starts to operate, and the one-chip controller (MPU) connected to the control circuit performs the initializing process and modifies the built-in program. do.

The battery voltage is converted into a voltage of 0 to 5V by converting the battery voltage (43V to 68.5V) through a "OUTPUT VOLTAGE SENSING" circuit (1) consisting of a known resistance divider and an operational amplifier circuit. The battery charging current is input to the analog input terminal RA0 of IC1, and the battery charging current is detected at a level of 0 to 60 mV in the shunt (SH1) of FIG. 4, and is passed through the "OUTPUT CURRENT SENSING" circuit (3) composed of a known operational amplifier circuit. It is converted into a voltage of 5V and input to the analog input terminal RA2 of the MPU (IC1), and the AC input current level detected by the CT is 0-5V through an "INPUT CURRENT SENSING" circuit (2) composed of a known operational amplifier circuit. It is converted to voltage and input to the analog input terminal RA1.

On the other hand, if three-phase 220V or three-phase 380V R, S, T is supplied through the 1,2,5 of CN2 of the three-phase phase detection circuit 6, first, the T-phase signal input through the fifth of CN2 is a resistor. By driving the photocoupler of IC7 through R39, a square wave that is in phase with the T-phase AC input signal is output to the output terminal R40 of the photocoupler IC7, and a standing signal is applied to the input of IC11F by the differential circuit of C27 and R41. The signal passes through the inverted Schmitt trigger buffer of IC11F and IC11E, and a trigger signal within 10 ms is applied to the INT output of IC11E as shown in Fig. 9- (3). This trigger signal is a zero-cross detection signal of T phase, which is an interrupt of MPU IC1. It is input to the input terminal RD0.

In the same way as above, the R phase signal inputted through CN2 # 1 is outputted to the output terminal (I / O) of IC10E with zero cross signal in phase with the R phase input signal as shown in [Fig. 8]-(4). / O input Input at RD1 terminal. In addition, the INT signal, which is the T phase zero cross detection signal, and the I / O signal, which is the R phase zero cross detection signal, are combined with the standing pulses of FIGS. 9 to 5 by a known OR logic circuit composed of the DIODEs of the diodes D13 and D14. Likewise, whenever T phase zero cross signal or R phase zero cross signal is generated, it is input to RD0 terminal, which is an external interrupt terminal of MPU, as an external interrupt enable signal, and this signal is used as a reference signal for power failure detection and triac phase control. Used as

Integrated circuit IC decoder IC4 is a 2 × 4 decoder that prevents Y1, Y2, and Y3 from simultaneously outputting a triac selection signal that specifies that the triacs S _1, S _{2, and} S ₁ output from the MPU are turned on. TAP designation signal output from PE ₀ , PE ₁ of MPU is input to “A, B” input terminal and IC4 connected to MPU output terminals PE _0, PE ₁ is used to determine which of Y1, Y2, Y3 is selected and output. If input terminal AB of A = 1, B = 0, Y1 is selected, if A = 0, B = 1, Y2 is selected, and if A = 1, B = 1, Y3 is selected. The "EN" input terminal of the decoder IC4 is shifted in synchronization with the zero-cross signals of the R and T phases described above so as to phase-control the triacs S _1, S _{2, and} S ₁ 'from the RC2 terminal of the MPU. Phase controlled PWM pulse waveform is outputted, or PWM pulse waveform that can continuously conduct triac (S _1, S _2, S ₁ ') is output and Y1, Y2, Y3 when there is no signal at EN input terminal of decoder IC4. Will stop output. The signals output from Y1, Y2, and Y3 are isolated and transmitted through the pulse transformer through the inverting buffer of IC11, and the triacs S _1, S _{2, and} S ₁ 'connected to the upper tap, middle tap, and lower tap of the main transformer tap, respectively. Will be driven.

RESET circuit (5) consists of RESET IC, capacitor C5, and resistor R1. If the MPU stops operating due to noise or other reasons, the magnet contactor S / W of Figs. It is designed to prevent overcharge and damage. The display unit 8 adopts a dynamic method of driving the FND and the LED by the combination of the MPU output terminals RB0 to RB7 and the resistors RD2, 3, 4 and 5. If the MPU operates normally, the reset circuit is used. The clock pulse is output from the MPU (I / O output) RD2 terminal input to the ST terminal of (5). If the MPU stops operating, the output of the clock pulse of the RD2 terminal of the MPU also stops, so that the supply of the clock pulse to the ST terminal of the reset circuit 5 is also stopped. In this way, if the clock pulse supply is interrupted to the ST terminal of the reset circuit 5 for a predetermined time, The reset signal "LOW" is output from the output terminal and the MPU When the reset signal is applied to the terminal, the MPU is initialized. In addition, at the RC0 output terminal of the MPU, a "LOW" signal is output according to the initialization of the CPU, and the relay 'F' for driving the magnet contactor S / W through the resistor R32. To turn off the magnet contactor and reset signal of 'High' output from No. 5, another RST output terminal of reset circuit, conducts transistor Q2 through resistor R31. As a hardware operation by cutting off the signal, the relay 'F' is turned off, and the main circuit magnet contactor S / W of the charger is cut off to stop charging.

A known buzzer drive circuit is connected to the PE2 output terminal of the MPU, and various switches necessary for the basic operation of the charger such as normal charging, equal charging, stopping, reservation charging and setting are connected to the I / O output terminals RC3 to RC7 input terminals, respectively. When the signal of the corresponding switch or key is inputted, the procedure chart performs the designated step of FIG.

As described above, the overall interconnection and operation of the control circuit have been described. Next, a process of executing a program in the MPU will be described with reference to FIGS. 7 and 8.

If the battery is connected while AC power is applied, the MPU performs the (INITIALIZE) process of step (1) in [Fig. 7]. This routine determines the status of each port of the MPU. If it is determined as output, it decides whether to have 'HIGH' signal or 'LOW' signal at the beginning.) And special register necessary for A / D conversion of A / D converter (A / D converter) built in MPU. Determine the initial value of. In addition, the timer interrupt detection period and the external interrupt allowance of the interrupt service routine are determined in the initialization process (1).

After the initialization process (1) of FIG. 7 is completed, the timer interrupt and the external interrupt are enabled (Enable), and the interrupt service routine of FIG. 8 is performed every timer interrupt period or when an external interrupt signal is applied. The timer interrupt is executed at each timer interrupt period set in the initialization process (1) of FIG. 7, and the external interrupt is executed every time the "HIGH" signal is applied to RD0, which is the external interrupt terminal of the MPU, and these are the main program (MAIN PROGRAM). Regardless of), it executes interrupt routine and returns to main program. The interrupt service routine of FIG. 8 will be described later in detail. After the initialization process (1), if SW1 'Stop', SW2 'Setting', SW3 'Reservation', SW4 'Equal' and SW5 'Normal' switch of Fig. 5 are pressed, RC3 ~ RC7 input terminal of MPU is "LOW". [Fig. 7]-(2) determines the operating state of the charger by receiving the switch input value. First, when the "NORMAL (普通)" switch is pressed [Fig. 7]-(3) charging time to normal charging 6 and the flow chart below [Fig. 6]-(6).

Second, when the "EQUAL (均等)" switch is pressed, the flow chart [Fig. 7]-(4) charging time is set to equal charging and the flow chart [Fig. 6]-(6) or less is performed.

Third, when the "PRE." Switch is pressed, the reservation time is determined according to the flow chart [Fig. 7]-(5) of the "PRE. (豫 約)" switch and the "SETTING" switch. If you press the "NORMAL" or "EQUAL" switch after setting the time, the scheduled charging time is counted and the flow chart will be the same as when the NORMAL or EQUAL switch is pressed after the scheduled time has elapsed. 7 to 6 are performed.

When the process of [Fig. 7]-(6) is performed, the RC0 output terminal of MPU IC1 of FIG. 5 is outputted with “HIGH” and the transistor Q3 is driven to turn on the relay 'F' to turn on the magnet contactor of the charger. It is ON and charging is progressed as below (6) of main program according to battery condition.

In the first step, when the battery voltage (or the charger output voltage) is 57.5V or less, the battery is sufficiently discharged, so that when the charging current (charging amount) is 105% (0.24C) or more, the triac S ₁ can be conducted. when generates a triac selection signal than by switching the sangtaep (t _1), reducing the charge current and the charge voltage of 95% it has to transfer the triac S ₁ 'to hataep (t _1') by increasing the charging current and the voltage Keep the charging current between 105% and 95% (0.24C ± 5%).

That is, as described above, the upper tap, the middle tap, and the lower tap (t _1, t _0, t ₁ ′) are drawn out from the starting point to the primary winding of the leakage transformer TM, and triacs S _1, S _2, 'it is) are connected and TRIAC S ₁ is connected to the hataep t ₁ "S ₁ when the conduction is increased, the battery current and voltage, and to more conduction sangtaep the current and voltage is reduced. As an example of the step-by-step control of voltage and current, the upper tap t ₁ is fully conducting, about 50% conduction, the middle tap t ₀ is about 50% conducting, the middle tap t ₀ is fully conducting, and the lower tap t ₁ 'is about 50%. continuity, there can have a step-by-step six states: the hataep of t ₁ 'and the fully conductive state more represented by each tap position value and 6,5,4,3,2,1 larger the tap position value that is currently being conductive The current and voltage decreases when the switch is made to the upper tap which is higher than the tap position, and the upper tap triac S ₁ , the middle tap triac So, or the lower tap triac S ₁ 'is [Fig. 8]-(6), ( As shown in 7), if the phase control is conducted at 90 °, respectively, the tap position is changed in sequence, and it is different depending on the turns ratio of the primary and secondary of the control transformer TL, but the charging current can be adjusted step by step.

This step is when the battery voltage is above 59.5V and below 60.0V. When the battery is over 75% charged, when the charge current (charged) is above 95%, the upper tap position is higher than the current state. Switch to the triac of tap to reduce charging current and charging voltage. If it is below 85%, transfer to lower tap triac of tap position lower than the current state to increase charging current and voltage to make charging current between 95% and 85%. (0.216C ± 5%).

In the third stage, when the battery voltage is above 60.0V, the charging current must maintain the terminal current (less than 25% of the rating) .If the charging current is greater than the terminal current (approximately 25% of the rating), the battery is switched to a tap higher than the current state. Charge by T time as a way to reduce the current and voltage, but if the battery voltage is more than 63.5V proceed to the next four steps without charging.

In the fourth stage, when the battery voltage is about 63.5V or more or when the third stage of charging is completed, when the battery voltage is 63.5V or more, the battery is switched to the upper tap than the present to decrease the charging voltage, and the charging voltage is 60.0V and the battery current is 15 If it is less than%, it transfers to the triac at the lower tap position than the current to increase the battery voltage and current to prevent the battery temperature from increasing unnecessarily at the end of charging. This process continues charging after the charging time set according to the normal charging or equal charging set in [7]-(2) and ends the charging.

Referring to the interrupt service routine of FIG. 8, there are two types of timer interrupts and external interrupts as described above.

First, the external interrupt of [Fig. 8]-(7) is executed at the moment when the "HIGH" signal is applied to RD0, the external interrupt input terminal of the MPU, and the standing pulse signal as shown in [Fig. 9]-(5) is applied to the external interrupt terminal RD0. When is applied, to determine whether the signal of T phase or R phase, first check whether the signal (Fig. 9)-(4) (i.e. zero cross signal of R) is applied to I / O input terminal RD1 of MPU. After setting the detection bit (BIT) of the relevant phase, the count value of the corresponding phase is initialized. That is, when an external interrupt trigger signal is input through the input terminal RD0, the MPU checks the state of the I / O input terminal RD1 immediately. If the status of the RD1 is 'LOW', it is recognized as a zero cross signal of the T phase. It is recognized as a zero cross signal.

After that, if the tap position value is 2, 4 or 5, 50% conduction of the lower tap, 50% conduction of the middle tap, and 50% conduction of the upper tap are applied. Therefore, the HIGH signal is applied to the EN terminal of the IC4 decoder. Do not generate pulses at the outputs of Y1, Y2, and Y3 until the corresponding phase count is greater than 90 ° by the timer interrupt. However, if the tap state is 1,3,6, the triac of the tap must be continuously connected, so it keeps outputting the pulse and sends the PWM pulse output to the selected tap among Y1, Y2, Y3 and then returns to the main program. do.

Second, if the timer interrupt is enabled, check if the position value of tap to be transferred is 2, 4, 5, and if 2, 4, 5, COUNT value of R is 0 ° ~ 90 ° or 180 ° ~ In case of 270 °, PWM output is stopped. In case of 90 ° ~ 180 ° or 270 ° ~ 360 °, pulse signal is generated to connect upper tap, middle tap, and lower tap as shown in [Fig. 9]-(6), (7). The current can be regulated step by step so that only about 50% of the triac is conducted. The T phase is also controlled in the same manner as the R phase.

In the timer interrupt shown in Fig. 8- (8), the clock routines for inputting switch values, detecting charge voltage and current, turning on and off the buzzer for displaying the charge status, detecting faults, and displaying LEDs and reserved charges. Perform routines that should be performed periodically. In addition, 10 hours after the magnet contactor is turned on, the charging is automatically terminated to prevent the battery from being broken. As described above, the MPU is charged by performing the step-by-step program shown in the chart of FIGS. 6 to 7. Control the control circuit to enable optimal charging.

3 and 5, the main circuit is configured as shown in FIG. 3 and FIG. 5, and the charge control circuit is configured by the MPU to sense the amount of charge. In the recovery and charging section, the current is 0.24C ± 5% in the first stage and 0.216C ± 5% in the second stage. When the current is controlled by the conduction or phase control of the triac by the size, and the voltage and the current are controlled in the third or fourth stages after the electrode voltage, the charging current and the charging amount of the present invention are shown in the charging time. It can be adjusted according to the existing charging method, which can reduce the time required for full charging to within 5 hours, and can prevent excessive liquid temperature rise at the end of the charge, reducing the amount of electricity consumed by heat, improving the charging efficiency and undercharging There is an advantage to prevent overcharge, and the main circuit and the control circuit is relatively simple, which can reduce the manufacturing cost.

Claims (3)

It has the function of monitoring and displaying the state of charge.In order to control the amount of current and voltage being charged, the control transformer (TL) primary is connected between the AC input and the leakage transformer input terminal, and the primary winding of the leakage transformer (TM) is divided into 2 parts. Draw the taps from the upper, lower and middle taps of the winding and connect them to one terminal of the triac, and the other terminal of the triac is commonly connected to the control terminal of the control transformer (TL). Output voltage sensing and shunt are provided at the input ports (RAO, RAZ) of the MPU, which are connected to the gate drive circuit output terminals of the control circuit and the roles of the respective input and output ports are determined as the embedded program is executed. The output current sensing detected at (Shunt) is input, and the triac (S1, So, S1 ') is selected as the upper tap or the lower tap according to the magnitude of the charging current. r)) and the T-phase input signal is input to the interrupt terminal of the MPU as a zero-cross signal of the T phase, and the zero-cross signal of the R-phase input is input to the interrupt terminal and another input port (I / O) of the MPU through a diode. The phase control of the selected triac phase is performed to charge the charging current to maintain a constant charging current (0.24c to 0.216c) in the first and second stages of the recovery charging section, and the charging current and voltage in the third and fourth stages of the last charging section. The charger circuit and its charge control circuit to control the within the specified value to enable optimal charging. The R and T phase AC input signals drive the photocoupler ICs 7 and 8 through resistors R35 and R39, respectively, and output a square wave synchronized with the AC input of the corresponding phase to the photocoupler output terminal. Create an upright signal to be in phase with each of the R and T phase zero cross signals, input the MPU interrupt terminal RDO through a known OR logic circuit, and input the R phase zero cross signal to the 1/0 input terminal of the MPU. Triac is used as a reference signal for phase control _, and the triac selection signal is input as 2 bits to the decoder AB terminal of 2 × 4 connected to the output terminals PE _0, PE ₁ or RD6, 7 of the MPU. Select Triac S _1, S _0, S ₁ ', and apply PWM pulse waveform to EN input terminal of decoder connected to RC2 output terminal of MPU to apply triac phase control to control charging current or voltage. M into action When the PU stops, the clock pulse of the RD2 terminal of the MPU stops, so the output terminal of a known reset circuit Of the MPU connected to The terminal is initiated with a reset "LOW" signal to initialize the MPU Charger terminal and its charge control circuit characterized in that "HIGH" is outputted to conduct through transistor Q ₂ to turn off the main circuit magnet S / W of the charger to stop the charge to prevent overcharge. 3. The charger circuit of claim 2, wherein the triac or bidirectional control device is controlled by directly connecting a triac or bidirectional control device between the control transformer secondary C1 and C2 terminals and executing a program embedded in the MPU. And a charge control circuit thereof.