The working process of receiving electric energy from the external circuit and converting it into chemical energy of the battery. After the energy of the battery is consumed by discharge, it can be recovered by charging and discharged again to form a charge discharge cycle. Generally, it is charged with DC current (also asymmetric AC current or pulse current). Under different circumstances, different charging methods are adopted, such as constant current charging, constant voltage charging, floating charging, trickle charging, emergency charging or combined charging of these methods.
Circuit principle:892051 is used to detect the negative charging slope. Mci4066 determines which battery to sample, and u3a-c constitutes a charging constant current source. Q3 and TL431 form a constant current source to charge C5. When the C5 voltage rises to the sampling voltage, U3D flip generates an interrupt INT0 and stops the 2051 internal timer. The voltage obtained by the timer is the voltage. When the measured voltage decreases continuously, the saturation Q4, Q5 or Q6 stops charging.