In this study, a detailed comparison between two power factor correction (PFC) controls, viz., average current mode (ACM) control and enhanced non-linear carrier (ENLC) control for single-ended primary inductance converter (SEPIC) are made. In ACM control, a linear current reference, generated using the conventional method is compared with the inductor current. In ENLC control, a non-linear carrier current reference, generated using passive components is compared with switch current. The proposed ENLC control uses reduced components and sensors compared to ACM and conventional non-linear carrier control methods. The evolving of nonlinear phenomena during load variation is investigated along with the electromagnetic interference (EMI) study with power spectral density estimation. For stability enhancement and EMI mitigation, a detailed simulation study is performed using MATLAB/Simulink platform. Mathematical bifurcation analysis, by deriving critical phase angle is carried out to obtain a better insight of stability boundaries in order to access the system behaviour. Owing to the advantages of ENLC, an experimental setup of ENLC controlled SEPIC PFC converter was built to support the results.

中文翻译：

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ACM和ENLC控制的SEPIC PFC转换器的性能比较和稳定性分析

在这项研究中，对两种功率因数校正（PFC）控制，即单端初级电感转换器（SEPIC）的平均电流模式（ACM）控制和增强型非线性载波（ENLC）控制进行了详细的比较。在ACM控制中，将使用常规方法生成的线性电流参考与电感器电流进行比较。在ENLC控制中，将使用无源组件生成的非线性载波电流参考与开关电流进行比较。与ACM和传统的非线性载波控制方法相比，建议的ENLC控制使用的组件和传感器减少了。研究了负载变化过程中非线性现象的演变，并结合了带有功率谱密度估计的电磁干扰（EMI）研究。为了增强稳定性和降低EMI，使用MATLAB / Simulink平台进行了详细的仿真研究。通过得出临界相角来进行数学分叉分析，以获得对稳定性边界的更好了解，从而了解系统行为。由于ENLC的优势，建立了ENLC控制的SEPIC PFC转换器的实验装置来支持结果。