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Multi-Phase Interleaved AC-DC Step-Down Converter with Power Factor Improvement.

Jose M Sosa-Zuniga1, Christopher J Rodriguez-Cortes1, Panfilo R Martinez-Rodriguez2

  • 1Tecnologico Nacional de Mexico/ITS de Irapuato, Irapuato 36821, Gto., Mexico.

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Summary
This summary is machine-generated.

This study introduces a novel single-phase controlled rectifier using an interleaved buck converter for improved power factor and regulated output voltage. The design ensures continuous input current, preventing grid injection of switching noise.

Keywords:
AC–DCLC filterPFCinterleaved buck converterrectifier

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Control Systems

Background:

  • Power factor improvement and output voltage regulation are critical in power electronic converters.
  • Traditional rectifier designs often suffer from poor power factor and harmonic distortion.

Purpose of the Study:

  • To present a novel single-phase non-isolated step-down controlled rectifier design.
  • To achieve high power factor and stable output voltage regulation.
  • To minimize switching frequency components injected into the power grid.

Main Methods:

  • Utilized a full-bridge diode rectifier combined with a multi-cell interleaved DC-DC buck converter.
  • Implemented discontinuous conduction mode for switching cells with continuous input LC filter current.
  • Developed a simple controller with minimal sensors for system operation.

Main Results:

  • Experimental validation confirmed the converter's effectiveness.
  • Achieved a power factor exceeding 0.9.
  • Demonstrated a maximum THD of 45.4% at 110.1W under steady-state conditions.

Conclusions:

  • The proposed interleaved buck converter offers a viable solution for power factor improvement and voltage regulation.
  • The design effectively suppresses switching harmonics in the grid.
  • Guidelines for converter design, open-loop analysis, and control strategies are provided.