具有快速负载瞬态响应的开关变换器数字均值电压控制方法

摘要

提出一种具有快速负载瞬态响应的开关变换器数字均值电压(DAV)控制方法.以Buck变换器为例,介绍DAV控制开关变换器的工作原理,建立变换器的z域模型,由此分析变换器的稳定性.对比分析 DAV 控制和数字 V2控制 Buck 变换器的稳定性与负载瞬态性能.研究结果表明:相比于数字V2控制,DAV控制Buck变换器具有更好的稳定性,在全占空比范围内都能够稳定工作;DAV控制Buck变换器的负载瞬态响应比数字V2控制更快.最后,通过仿真和实验验证了理论分析的正确性.%A novel digital average voltage (DAV) control technique for switching converter with fast load transient response is proposed. Taken Buck converter as an example, the principle of DAV controlled switching converter is introduced, and its z-domain model is established to investigate system stability. Moreover, its stability and load transient performance are analyzed, and the comparisons with digital V2controlled buck converter are carried out. The results show that DAV controlled buck converter has better stability, which can work stably in the whole range of duty ratio. Moreover, the load transient performance of DAV control is better than that of digital V2control. Finally, the correctness of the theoretical analysis is proved by simulation and experimental results.