A charging circuit for preventing overcharge and overdischarge of a battery and a control method thereof

Abstract

The application relates to the technical field of circuits, in particular to a charging circuit for preventing overcharging and overdischarging of a battery and a control method thereof. The circuit comprises a power input end, a charging switch circuit, a charging chip, a battery, a discharging switch circuit and a power supply output end which are connected in sequence, and further comprises a full-battery detection circuit and an under-voltage detection circuit. When the battery is fully charged, the full-battery detection circuit triggers the charging switch circuit to be turned off, and the charging of the battery is stopped; when the voltage of the battery is reduced to the charging voltage, the full-battery detection circuit triggers the charging switch circuit to be turned on, and the battery is charged; when the battery is undercharged, the under-voltage detection circuit triggers the discharging switch circuit to be turned off, and the discharging to the outside is stopped; when the voltage of the battery reaches the discharging voltage, the under-voltage detection circuit triggers the discharging switch circuit to be turned on, and the battery discharges to the outside. The application can effectively solve the problems of stopping charging, floating charging and overdischarging existing in the conventional charging chip circuit, is suitable for different charging chips and battery protection boards, and thus the battery is protected.

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