基于 Saber 的开关电源设计与仿真

摘要

DC/DC switching power supply is open-loop simulated with Saber software. When input voltage fluctuates, the ripple of output voltage is large and can not meet the design requirement. Adopting small signal analysis method, according to the Bode diagram of system, transfer function structure is deduced and closed loop feedback network is designed. The closed loop feedback network is added into system to simulate, and the result shows that closed loop feedback network not only makes output voltage rise quickly, but also reduce ripple coefficient of output voltage, improves stability of output voltage.%　　使用 Saber 软件，开环仿真了 DC/DC 开关电源，输入电压波动时，输出纹波电压较大，不能满足设计要求。采用小信号分析方法，根据系统伯德图分析其传递函数的结构形式，设计了闭环反馈网络。将闭环反馈网络加入系统并仿真，结果表明，闭环反馈网络不仅使输出电压迅速上升，而且减小了输出电压的纹波系数，增强了输出电压的稳定性