带前馈电容的补偿网络对反激变换器动态响应的影响研究  

Research on Compensation Network with Feedforward Capacitor Influences on Transient Response of Flyback Converter

作　　者：马升杰[1] 张石磊[1] 刘航志 

机构地区：[1]中国电子科技集团公司第43研究所,合肥230088

出　　处：《混合微电子技术》2014年第4期1-5,9,共6页Hybrid Microelectronics Technology

摘　　要：本文根据控制系统的开环频率特性与系统动态响应之间的关系，结合反激变换器的从误差放大器到输出电压的开环传递函数以及带前馈电容的反馈补偿网络的频率特性，分析了前馈电容的变化对变换器系统开环传递函数的影响，分析认为通过合理的设计参数，带前馈电容的补偿网络可以提高系统的穿越频率，从而提高系统的动态响应能力，同时由于前馈电容在采样点和反馈点之间，因此可以改善系统的启动过冲。最后，通过仿真和实验验证了这种补偿网络的可行性。According to the relationship between the open loop frequency characteristics and dynamic response of the control system, combined with the open loop transfer function from error amplifier to output voltage of flyback converter and frequency characteristic of feedback compensation networks with feedforward capacitor, the change of feedforward capacitor influences on open loop transfer function of the converter system is analyzed. It is considered that the cross - over frequency can be improved by reasonable design parameters and compensation networks with feedforward capacitor. Furthermore,due to the feedforward capacitor is between the sampling points and feedback point, the start - up overshoot of the converter can be optimized. Finally the feasibility of the compensation network is verified by simulation and experimental resuhs.

关 键 词：反激变换器 动态响应 穿越频率 相位裕度 补偿网络 

分 类 号：TM46[电气工程—电器]