基于Fly-Buck的新型隔离偏置电源的研究

Study on the new isolated bias power supply based on Fly-Buck

栅极驱动器在电力电子设备中具有重要作用,多以电荷泵电路和反激式隔离电路作为驱动电源。针对传统非隔离型电荷泵电路驱动能力有限、安全性低以及隔离型反激式拓扑闭环反馈控制复杂、多绕组输出交叉调整率等问题,文中介绍了一种基于同步整流Fly-Buck拓扑的隔离型偏置电源。分析了Fly-Buck变换器的工作原理,推导出CCM下电路基本的稳态工作关系,仿真与制作样机实验,通过实验数据观测,验证了理论分析的正确性以及本文提出的辅助电源的可行性。与传统的隔离式反激拓扑结构相比,Fly-Buck变换器具有交叉调节好、线路瞬态响应小、EMI低等优点,同时设计简单灵活,适用于多种输出配置。

The gate driver plays an important role in the power electronic equipment.Aiming at the problems of limited driving ability,low safety,complex closed-loop feedback control of isolated flyback topology and cross-regulation rate of multi-winding output of traditional non-isolated charge pump circuit,this paper introduces an isolated bias power supply based on fly-buck topology.This paper analyzes the working principle of fly-buck converter,deduces the basic steady-state working relationship of the circuit under CCM,simulates and makes prototype experiments,and verifies the correctness of the theoretical analysis and the feasibility of the auxiliary power supply proposed in this paper through the observation of experimental data.Compared with the traditional isolated switching power supply topology,fly-back converter has the advantages of good cross regulation,small transient response of the line,low EMI,etc.At the same time,the design is simple and flexible,suitable for a variety of output configuration.