Battery discharge prevention circuit

Abstract

The invention relates to a self-locking battery discharge prevention circuit which comprises a reference circuit, an undervoltage detection circuit, a charging detection circuit, a protection self-locking circuit and a protection output circuit. The undervoltage detection circuit detects the low voltage of a battery, outputs an undervoltage signal of the battery and triggers the protection self-locking circuit to form self-locking and control the protection output circuit to switch output off. When the battery is charged, and the charging detection circuit detects an output charging signal and triggers the protection self-locking circuit to unlock and control the protection output circuit to switch output on. Due to the use of an accurate constant pressure source, the self-locking battery discharge prevention circuit can realize accurate undervoltage detection, immediately triggers a self-locking circuit and switches a load-discharging loop off when detecting the undervoltage battery. The self-locking circuit can be unlocked only after the battery is charged by the circuit. Accordingly, the circuit takes the extremely reliable protection for the excessive discharge of the battery.

Description

technical field [0001] The invention relates to the field of protection circuits for DC power supplies, in particular to a self-locking battery discharge protection circuit for on-line backup power supplies. Background technique [0002] The repeated charge and discharge technology of batteries has been continuously developed, especially the charge and discharge technology of maintenance-free lead-acid batteries has been continuously improved. Since the maintenance-free lead-acid battery has the advantages of large capacity, high capacity density, low manufacturing difficulty, low price, uniform size and no maintenance, it is widely used as a backup power source for various equipment as an energy storage device. However, the lead-acid battery itself has many disadvantages. With the increase of the number of uses and the use time, the capacity of the battery continues to decrease and the internal resistance increases. In particular, over-discharge of lead-acid batteries will...

AI Technical Summary

Problems solved by technology

Although this over-discharge will not cause battery damage, it will speed up the decline in battery capacity and shorten the service life.

Especially when there is protection, because the discharge circuit of the load is repeatedly connected and disconnected, it will cause a great impact on the load equipment, and even damage the load equipment

There are also many circuits that use battery management integrated circuits to make battery management system circuits. Although they can protect the battery well, the circuits are complex, the functions are cumbersome and overlap each other, the cost is also high, and the waste rate is also high.

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