Charging protection circuit for battery

Abstract

Disclosed is a battery charge protection circuit which includes a charge power supply input end, a zener diode, a voltage divider, a driving device, a switch device and a charge power supply output end. The charge power supply input end is connected with the negative pole of the zener diode whose positive pole is grounded through the voltage divider. The charge power supply output end provides a charge voltage; the voltage value of the zener diode is a standard charge voltage; when the charge voltage at the charge power supply output end exceeds the voltage value of the zener diode, the driving device outputs a control signal to switch off the witch device, so that the charge voltage at the charge power supply output end is shut off; thereby the charge power supply output end has no charge voltage, the charger stops charging the battery and prevents the battery from being damaged by over voltage charging.

Description

technical field [0001] The invention relates to a protection circuit, in particular to a battery charging protection circuit. Background technique [0002] At present, in addition to the charging function, most chargers also have certain protection functions, such as overcharging and short circuit protection functions for the battery. Since the rechargeable battery is a capacitive load, there is a strict limit on the charging voltage of the charger, but there is no strict requirement on the charging voltage in the existing chargers, and there is no corresponding overvoltage protection circuit. If the user accidentally uses a charging voltage higher than the standard voltage to charge the battery, the charging control chip of the battery may be out of control, causing unpredictable hidden dangers. For example, the temperature of some field effect tube components rises rapidly, causing the battery Smoke and fire, more serious may also cause the battery to explode, not only da...

AI Technical Summary

Problems solved by technology

Since the rechargeable battery is a capacitive load, there are strict restrictions on the charging voltage of the charger, but the existing chargers have no strict requirements on the charging voltage, and there is no corresponding overvoltage protection circuit

If the user accidentally uses a charging voltage higher than the standard voltage to charge the battery, the charging control chip of the battery may be out of control, causing unpredictable hidden dangers. For example, the temperature of some field effect tube components rises rapidly, causing the battery Smoke and fire, more serious may cause the battery to explode, not only damage the battery but also may cause a fire

[0003] In addition, some existing chargers are designed with two-pin plugs, but there is no fool-proof design. If the two-pin plugs are inserted incorrectly, the charging polarity will be just opposite. If the battery is charged directly, the battery will be easily damaged.

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