Design of Front-End Power Supply for Lithium Battery Equalization Charging System

In order to meet the front-end power supply requirements of the lithium battery equalization charging system, this paper designs a flyback DC-DC converter based on the UCC28740 chip, analyzes and calculates the main parameters of the circuit topology. Meantime, this paper also establish a small signal model of which feedback control, and base on that, this paper design a feedback control network which composed of TL431 and optocoupler to improve the stability and reliability of the system. At last, the results of the experiment verifies that the output power supply is stable, its response speed is fast, and the robustness is good.