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交错并联磁集成Buck变换器本质安全性输出纹波电压的分析

, PP. 181-188

Keywords: 交错并联磁集成,本质安全,输出纹波电压,Buck,DC-DC变换器

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Abstract:

为了使Buck变换器以较小的电感达到期望的输出纹波电压指标并满足本质安全要求,将交错并联磁集成技术应用到Buck变换器中,通过合理设置耦合系数,可以增大等效电气电感,同时减小等效本质安全电感,解决了电气指标要求大电感而本质安全特性要求小电感的矛盾。按电感的大小将Buck变换器分为四个工作区域,比较各个区域的最大输出纹波电压,并分析出纹波电压与电感、占空比及负载电阻的关系,得出应在最小占空比与最小负载对应的电感和最小占空比与最大负载对应的电感之间设计变换器。最后通过仿真和实验验证了理论分析的正确性。

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