谷值V2控制Boost变换器的频域与时域特性分析

摘要

Based on the analysis of the output voltage ripple characteristics of boost converter,the V2 control technique was applied to Boost converter. The principle of operation of valley V2 controlled Boost converter was analyzed in detail and a small-signal model was established. Based on this model, the control-to-output,input-to-output,and output impedance transfer functions were deduced. The characteristics of valley V2 controlled Boost converter in time-domain and frequency-domain was analyzed,and it was also compared with valley current mode (VCM)controlled Boost converter. The results show that valley V2 controlled Boost converter has faster input and load transient response speed than VCM controlled Boost converter. The time domain simulation results show that,compared with the valley current control,when the input voltage increases and decreases,transient response time of valley V2 control is reduced by about 530μs and 800μs respectively,and when the load increases and decreases,it is reduced about 650 μs and 1 330 μs respectively. Experimental results are in agreement with simulation ones,demonstrating that the theoretical analysis is correct.%基于对Boost变换器输出电压纹波的分析，本文将谷值V2控制技术应用于Boost变换器．详细分析了谷值V2控制Boost变换器的工作原理，首次建立了谷值V2控制Boost变换器的小信号模型，推导了控制-输出、输入-输出和输出阻抗等传递函数，研究了其频域与时域特性，并与谷值电流控制Boost变换器进行了比较分析．研究结果表明，与谷值电流控制相比，谷值V2控制Boost变换器具有比谷值电流控制Boost变换器更快的输入和负载瞬态响应速度，在给定参数下，谷值V2控制瞬态响应在输入电压增加时快530μs，输入电压减少时快800μs；当负载增加时快650μs，负载减少时快1330μs．实验结果与仿真结果基本一致，验证了理论和仿真分析的正确性．