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In this work, a Single-Ended Primary Inductor Converter (SEPIC) with improved power factor correction stage is developed for Electric Vehicle (EV) charging application. Practically, it is desirable to employ a Power Factor Correction (PFC) circuit that operates in a way that input current is taken from the source remains continuous, power factor is high, step-down operation, and stable output regulation. This research focuses on the analysis and design of a non-isolated hard switching Discontinuous Conduction Mode (DCM) SEPIC PFC, which addresses these requirements. By operating in the DCM mode, the SEPIC converter enables variable step-down output voltage, continuous conduction of input current, and eliminates reverse recovery losses simultaneously. The paper begins with circuit analysis for both DC–DC conversion and PFC operation and transfer function for PI controller can be derived based on averaged switching model, small signal model. The close loop controller is implemented in voltage follower mode, for the proposed DCM operated SEPIC PFC. The PFC stage is implemented in MATLAB Simulink environment and results obtained to validate the concept of inherent Power Factor Correction using DCM converter operated in voltage follower mode of control.

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Design of Vehicle Mounted EV Charging Power Factor Correction Stage Employing Single Ended Primary Inductor Converter

  • 会议论文

  • 发表日期：

    2026年

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  • K. A. Ayesha Siddika,
  • Bhuvanesh Prakash Bhagwat,
  • Pavana Prabhu,
  • Vasudha Hegde

摘要

In this work, a Single-Ended Primary Inductor Converter (SEPIC) with improved power factor correction stage is developed for Electric Vehicle (EV) charging application. Practically, it is desirable to employ a Power Factor Correction (PFC) circuit that operates in a way that input current is taken from the source remains continuous, power factor is high, step-down operation, and stable output regulation. This research focuses on the analysis and design of a non-isolated hard switching Discontinuous Conduction Mode (DCM) SEPIC PFC, which addresses these requirements. By operating in the DCM mode, the SEPIC converter enables variable step-down output voltage, continuous conduction of input current, and eliminates reverse recovery losses simultaneously. The paper begins with circuit analysis for both DC–DC conversion and PFC operation and transfer function for PI controller can be derived based on averaged switching model, small signal model. The close loop controller is implemented in voltage follower mode, for the proposed DCM operated SEPIC PFC. The PFC stage is implemented in MATLAB Simulink environment and results obtained to validate the concept of inherent Power Factor Correction using DCM converter operated in voltage follower mode of control.