环路延时对数字峰值电压控制开关变换器瞬态性能的影响

研究数字控制环路延时对开关变换器瞬态性能的影响，提出克服环路延时影响的简单实用算法。在数字峰值电压算法的基础上，对开关变换器数字控制算法中延时的存在进行分析，提出克服延时的策略，并得到改进型数字峰值电压控制算法。在此基础上，对单次采样的局限性进行分析，并提出将多采样算法用于典型降压(Buck)变换器中，用于进一步减小环路延时。利用仿真和实验对所提出的不同算法进行验证，并对瞬态性能进行分析。结果比较说明采用克服延时算法能减小延时，从而提高瞬态响应，多采样算法则是在此基础上的进一步改进。

Time Delay Effect on Transient Performance of Digital Peak Voltage Controlled Switching Converter

Based on digital peak voltage controlled Buck converter, the presence of the loop delay in digital controller of switchign DC-DC converter was investigated, and proposed improved digital peak voltage control by a way to eliminate one-switching-cycle-delay. Thereafter, the limitation of single sample in digital controller was analyzed, and multi-sample technique was adopted in Buck converter to overcome the loop delay effect in further degree. Simulation and experiments were carried out to verify the improvement of the transient performance. The results show that the method to overcome time delay can improve the transient performance, and multi-sample technique can improve the transient performance in further step with much less loop delay effect.