输出电压纹波对电流型Boost变换器稳定性的影响

研究了电流型Boost变换器输出电压纹波对变换器稳定运行的影响。通过建立考虑变换器输出电压纹波的电感电流频闪映射，得到了变换器稳定运行的条件。该条件表明，Boost变换器的输出电压纹波对变换器稳定运行的边界有显著影响。经过一些合理的假设，得到了利用变换器电路参数预测占空比的稳定边界的一个解析表达式。在此基础上，基于能量守恒原理得到了输出电压存在纹波时，电流型Boost变换器稳定参数域预测的解析表达式，该式能够较好地预测变换器的稳定参数域。

Effects of Output Voltage Ripple on the Stability of Current-mode Boost Converters

Effects of output voltage ripple on the stability of current-mode Boost converters is studied in this paper. Firstly, stroboscopic map of inductance current is derived. Based on this map, stable condition for the converter is drawn, which shows that the stable border is affected by the output voltage ripple evidently. Then, a closed form expression for the stable border of duty cycle is obtained through some rational hypotheses. Further more, based on the energy conservation principle, another expression is drawn which can forecast the stable parameter region of the current-mode Boost converters. Finally the numerical simulation shows that output voltage ripple has notable effects on the stable parameter region, which can be forecasted by the energy conservation principle effectively.