usb charging circuit working principle: through the MCU to detect the battery voltage and charging current. PWM output control by MCU.
Temperature protection: Through unilateral detection of thermistor value, more than the set temperature MCU output protection.
To use the equalization circuit: the voltage of each battery is detected by the single chip microcomputer. If the voltage of a single battery exceeds the average voltage, the single-chip microcomputer output signal to control the bypass circuit of the abnormal battery. Achieve the effect of battery voltage balance.