The charging IC chip manages the charging process and charges the battery with a suitable current. Generally, it will go through three stages of trickle charging, constant current charging, and constant voltage charging. The IC in the charger detects and controls the charger. When the IC detects that the rechargeable battery is fully charged, the IC will automatically cut off the charging power to protect the rechargeable battery from being overcharged.

Ni-MH batteries generally generate heat during the charging process, so the Ni-MH charging management chip generally also includes temperature detection. When the charger is connected to charge, an overcurrent is suddenly generated, and the circuit immediately performs overcurrent detection. At this time, Cout will be high. Turning to low, the power MOSFET is turned from on to off to realize the protection function.

Lithium-ion batteries are widely used because of their large discharge current, low internal resistance, long life, and no memory effect. Lithium-ion batteries are strictly prohibited from overcharging, overdischarging, and short-circuiting during use, otherwise the battery will catch fire and explode. Therefore, when using a rechargeable lithium battery, there will be a protection board to protect the safety of the battery. The lithium battery protection board is mainly composed of a protection IC (overvoltage protection) and a MOS tube (overcurrent protection), which are used to protect the lithium battery. Cell-safe devices.

Usually, the charging protection IC will have a delay time during the overcharging protection, and then the power MOSFET will be cut off to achieve the purpose of protection. After the overcharging protection, as long as the charger is connected to the battery pack, it will enter the overcharge lock at this time. In this mode, the voltage drop of the lithium battery will not cause recharging, and the charging and discharging state can be restored by removing the charger and connecting the load.

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