A battery charging automatic control circuit

Abstract

The invention discloses an automatic control circuit for storage battery charging. The automatic control circuit comprises a high-voltage relay, a first low-voltage relay, a second low-voltage relay,a key control module and a main control module, wherein the main control module disconnects the high-voltage relay between a charger and a power frequency signal and a first low-voltage relay connected between the charger and the storage battery and connects the second low-voltage relay connected between the storage battery and the output to enable the storage battery to discharge, when key control signal is used for controlling a storage battery to discharge, the main control module disconnects the second low-voltage relay when the key control signal is used for controlling the storage battery to charge, and connects the high-voltage relay and the first low-voltage relay for charging when the voltage value of the storage battery is lower than a preset discharging voltage value, and disconnects the high-voltage relay and the first low-voltage relay to terminate the charging when the voltage value reaches a preset charging voltage value. According to the invention, the safety and stability are achieved, the control is standard, the operation is simple, the working state can be switched by one key, and the voltage of the storage battery can be effectively monitored.

Description

technical field [0001] The invention belongs to the field of battery charging automatic control, and more specifically relates to a battery charging automatic control circuit. Background technique [0002] Lead-acid batteries are widely used in production and life due to their advantages of stable voltage and low price. However, a common problem, regardless of the type of battery, is the possibility of emptying the charge. However, some power supply equipment needs stable and continuous power supply. Once the power is insufficient, it will inevitably cause it to fail to work normally. [0003] There have been many studies on the design of the automatic charging circuit for the battery. However, after research, it is found that the basic principle of the traditional automatic charging circuit is to divide the voltage from the output terminal of the charger and send it to the positive input terminal of the comparator as the reference voltage for charging control; The revers...

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an automatic control circuit for battery charging, thereby solving the technical problems of complex control and high device cost that currently exist in the use of microcontrollers as automatic control means

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