Storage battery detecting device and undervoltage protection method thereof

Abstract

The invention discloses a storage battery detecting device and an undervoltage protection method thereof. The storage battery detecting device comprises an undervoltage protection switch, a voltage sampling circuit, an undervoltage comparing circuit and a current judging circuit. The method comprises the following steps of: determining whether a working voltage signal VS is greater than the lowest reference voltage signal VON; when VS is less than VON, disconnecting the undervoltage protection switch; when VS is more than VON, connecting the undervoltage protection switch and then determining an EN signal; when EN is at a low level, determining whether VS is less than an undervoltage protection point VOFF_H; when VS is greater than VOFF_H, continuing determining the EN signal; when VS is less than VOFF_H, disconnecting the undervoltage protection switch; when EN is at a high level, determining whether VS is less than an undervoltage protection point VOFF_L; when VS is greater than VOFF_L, continuing determining the EN signal; and when VS is less than VOFF_L, closing the undervoltage protection switch. The device provided by the invention is capable of protecting the service life of a storage battery.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a storage battery detection device and an undervoltage protection method for the storage battery detection device. Background technique [0002] Batteries are a key component of uninterruptible power supply systems and are widely used in power supply systems such as communications, railways, electric power, and data centers. At the same time, as the weak link of the uninterrupted power supply system, the reliability of the battery is particularly important. The battery detection device provides online diagnosis for the battery, which has been paid more and more attention. When the AC power supply fails, the uninterruptible power supply system needs to supply power to the user's load through the battery, and the battery detection device is also powered by the battery. When the discharge of the battery drops to the termination voltage, it is necessary to disconnect the user lo...

AI Technical Summary

Problems solved by technology

Since the end voltage of the battery is different under different discharge rates, the undervoltage protection point should also be different. If the undervoltage protection point is set high, the battery detection device will perform protection before the user load is disconnected, and the significance of battery detection will be lost; undervoltage If the protection point is set low, the battery detection device will be disconnected after the user load is disconnected, but the battery detection device has not been disconnected, then the battery and the battery detection device will form a discharge circuit, and the battery will discharge the battery detection device with a small current to the final voltage The voltage is also low, so that the service life of the battery is lost

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