Performance comparison and stability analysis of ACM and ENLC controlled SEPIC PFC converter

Abstract

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.

Voltage Regulation and Power Factor Enhancement for EV Charging Station by Using Optimization Algorithm

“…Unlike voltage control methods, ACMC directly regulates the inductor current, offering inherent voltage loop compensation and improved transient response. [4] The key feature of ACMC is its ability to maintain a constant average current by dynamically adjusting the duty cycle of the power switch. This is achieved by continuously comparing the sensed inductor current with a reference value and if the current deviates, the duty cycle is adjusted to bring the desired output.…”

Enhancement of Power Factor Correction in an Ac-Dc Converter With an Integrated Boost-Flyback Circuit

“…The passive PFC approach offers a reliable solution, but its greater weight and volume result in lower power packing density. On the other hand, active PFC uses semiconductor switches to provide a more effective solution that overcomes the inability of passive PFC [11].…”