KR920002185Y1 - Circuit detecting electrical charging of elevator - Google Patents

Abstract

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Description

Full charge detection circuit of storage battery

1 is a graph showing the charging characteristics of the quasi-voltage charging method.

2 is a block diagram of a full charge detection circuit of the present invention.

3 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1: BCD data output A / D converter = 5, 7: 4bit shift register

9: 4 bit shift register 6, 8: Binary counter

10: BCD counter 12: Analog comparator

A: electrode voltage SCR1: thyristor

F: Relay Q1: NPN transistor

The present invention relates to a full charge detection circuit of a battery that prevents undercharging or overcharging by continuously sensing a voltage change amount of a battery and pick-up of a full charge state and automatically terminating charging.

Conventional electric vehicle batteries have adopted silicon quasi-constant voltage chargers, which are relatively inexpensive and simple in circuit. This is a method of connecting a reactor or a resistor between a rectifier and a capacitor which does not have a constant voltage function and charging using the voltage drop. In the charging method of FIG. 1, the charging characteristic of the battery is gradually increased as the charge increases, and then rapidly increases from the point A (about 2.37 V), which is the electrode voltage. When it reaches the point B close to the full charge state, it can be seen that charging is performed with little voltage change.

In this case, the conventional automatic charging method operates a voltage relay at a voltage of 2.37 V (a-point electrode contact in Fig. 1), and from this point on, it is possible to complete charging after a predetermined period of time by a timer. The point A of 1 degree, that is, the electrode voltage is about 80% of the charge of the battery. In the quasi-constant voltage charging method, since the charging voltage and the current vary according to the input voltage change even after the electrode voltage, it continues when the input voltage fluctuates. It was necessary to monitor the state of charge and pick up the full state of charge.

In addition, the conventional battery charge control circuit has been proposed as a feature of the thyristors (SCR) and the temperature sensor in order to automatically control the charging of the fast-charged battery is required to automatically shut off the charging power when the charge is completed In order to prevent the overcharge and to avoid the risk of damage to the peripheral device due to the overcharge (Application No. 84-11851), there is a light emitting diode connected at the completion of the charge (Application No. 84-11849). In this case, the light emitting diode and the charging transistor are turned off to prevent overcharging (Application No. 84-13865), and the charging control circuit (Application No. 85-6118) of the battery used in portable electronic devices depends on the capacity of the battery for charging. It is possible to set the charging time freely and to prevent the battery from being overcharged during charging. Nos. 85-9469) have been proposed.

The above invention is mainly related to a charge control circuit of a battery used in an electronic device, and only the voltage to be charged or adjusts the charging time to terminate the charging, there was an inconvenience in maintaining a fully charged state.

The present invention detects the state of charge of the battery even after the electrode voltage, picks up the state of full charge and terminates the charge to prevent undercharging or overcharging. As the charge proceeds, the battery terminal voltage is the electrode voltage (A in FIG. 1A). ) When the battery reaches the full charge state after the point B, the amount of increase in the battery terminal voltage per hour is extremely small. Thus, a circuit capable of detecting the full charge state by detecting this is provided. If set according to the figure is as follows.

The battery voltage is serially output to the BCD code, which is a digital signal through the A / D converter 1, and when the clock pulse is applied to the shift register 5 in accordance with the point at which data corresponding to one unit of digit is output, the shift register 5 Only one unit of digit voltage information is shifted and stored.

Data (Q ₀ -Q ₃ ) shifted after a predetermined time divided by the binary counts (6) (8) and output from the shift register (7) and output data before a predetermined time elapses. If the values are the same, the signal (a) output through the digital comparator 9 and the output signal (b) of the comparator outputting the signal when the voltage of the battery is greater than the electrode voltage (2.37V in FIG. At the same time, after counting for a predetermined time, SCR is triggered to excite the relay (F). Here, the output of the comparator 12A that picked up the electrode voltage even if the signal is output from the digital comparator 9 because the voltage is almost unchanged before the electrode voltage, that is, the charge amount is less than 80%. ), The count is configured to not work.

In addition, only a voltage comparator corresponding to one unit of the voltage information amount shifted and stored in the shift register through the A / D converter 1 and the voltage information amount currently input to the shift register using a known comparator is used. (9) compares or compares the amount of voltage information stored in the shift register with the amount of information currently being input, and if a value corresponding to one unit digit is the same using a known circuit, a signal may be output.

Referring to the operation of the circuit for detecting a full charge state according to FIG. 3, if the voltage is applied to the input terminal (V) of IC1 at an acceptable level for the battery voltage, pins Q ₁ , Q ₂ , Q ₃ , and Q _{4 are applied.} The output terminal is a BCD code and serially outputs from the data corresponding to one unit digit, and the other output terminal DS outputs a high signal (referred to as DS _one digit designation signal) during the period in which _one digit is output. .

That is, when the one-digit digit designation signal DS ₁ from the pin DS is applied to the input terminal CK of the IC5 as a clock signal through the buffer gate, only the data (information) corresponding to the one-digit digit is shifted to the BCD code and stored in the IC5. do.

R11 and C ₅ are to some extent so that the delay (Delay) than sitjeom which data is input corresponding to the clock signal to the first storage unit digit is only one unit of data digits is exactly shifted to IC5.

IC6 and IC8 are binary counters that divide the _one- digit designation signal DS ₁ into the clock input terminal CK of IC7, and the information stored in IC5 is sequentially transferred to the shift register IC7 every predetermined time determined by the counter. Is shifted to

Digital comparator IC9 is shifted every predetermined time of IC7 voltage information amount stored in the output stage (Data, pin _{B 0, B 1, B 2} , B 3) and the pin A _0, A of the voltage information amount IC9, which is input to the current IC7 _When comparing ₁ , A ₂ , and A ₃ , the same, that is, if there is no change in one digit, output pin 3 of IC 9 sends out a signal.

When the output of IC9 goes high, the emitter voltage of transistor Q ₁ goes high. If the output of IC ₁₂ A goes high, the control input terminal of the counter of IC10 goes low through the inverter gate and the counter IC10 counts. hours after the start, and set the after starting the count coupled to the output (Q ₄₎ of the IC10 and the set time is the relay (E) woman triggers the SCR1 gate of connected to the output (Q ₄₎ of the IC10 the operation of the charger It sends out a signal that can be stopped.

Since the change in the terminal voltage of the battery is extremely small and the IC9 emits a signal, charging must continue before the electrode voltage. If the voltage of the battery is less than the electrode voltage, the non-inverting input of the IC comparator 12A is less than the inverting input (reference voltage). The output goes low and the IC ₁₀ counter does not count because the control input is "high". In addition, if an unexpected failure occurs in the circuits of ICs 5, 7, 9, etc., it can not detect the voltage rise state or if the input voltage of the charger rises and the battery voltage becomes overvoltage, the output of the IC 12B comparator goes high, which also causes SCR1. Since the trigger (F) is excited by triggering, charging is stopped to prevent overcharging in advance.

Using the circuit configured in this way, in addition to the quasi-voltage charging method, in the constant voltage constant current floating charging method, the sensing of the full charge state is terminated, or the full charge signal is received to switch to the trickle charge, and the discharge degree of any other state is different. It is possible to maintain the state of charge without overcharging the battery, which can extend the life of the battery.

Claims (3)

Only the data corresponding to one unit digit (BCD code) is applied to the A / D converter 1 when the battery voltage is divided to an acceptable level and synchronized to the point at which the one digit is output. Is shifted and stored in the shift register 7 every predetermined time, and the amount of voltage information stored in the output terminal is compared with the amount of voltage information currently input, and if the two values are the same, the signal output by the digital comparator 9 Full charge detection circuit of a rechargeable battery, characterized in that for detecting the full charge state using. The digital comparator 9 inputs both signals to the NAND gate when the digital comparator 9 outputs a signal (a) and an electrode voltage (A point) or more when there is no voltage change and the signal (b) comes out of the gate. Full charge detection circuit of a storage battery, characterized in that the charge is stopped during full charge through the count circuit. The digital comparator 9 compares and outputs only the voltage information amount shifted and stored in the shift register 5 and the voltage information amount corresponding to one unit digit among the voltage information amount currently input to the shift register 5. A full charge detection circuit of a capacitor using a generated signal.