A Design of Charge-Discharge Circuit Based on Lithium Battery for Small UAVs

In this paper, a high efficiency, small size, and the high-reliability bidirectional DC-DC converter is designed to solve the switching problem between the small UAVs and the backup DC power supply. The converter uses Buck/Boost circuit as the main circuit, with the IR2110 chip as the Driver circuit. And the microcontroller receives feedback signals to generate PWM wave to control the driving chip and realize the charging mode, discharging mode and an automatic mode in the circuit. Thus the function of the constant current charging and discharging for lithium batteries is realized. After testing, the conversion efficiency of the converter is up to 95%, and the control precision of the current is also superior.