Charging circuit for preventing over-charging and over-discharging of battery and control method thereof

The invention relates to the technical field of circuits, in particular to a charging circuit for preventing a battery from being overcharged and overdischarged and a control method thereof.The circuit comprises a power input end, a charging switch circuit, a charging chip, the battery, a discharging switch circuit and a power supply output end which are connected in sequence, and further comprises a full-charge detection circuit and an undervoltage detection circuit; when the battery is fully charged, the full-charge detection circuit triggers the charging switch circuit to be switched off, and battery charging is stopped; when the voltage of the battery is reduced to the charging voltage, the full charge detection circuit triggers the charging switch circuit to be switched on to charge the battery; when the battery is insufficient in power, the under-voltage detection circuit triggers the discharge switch circuit to be switched off, and external discharge is stopped; when the voltage of the battery reaches