A Step-by-Step Design for Low-Pass Input Filter of the Single-Stage Converter

Qingqing He,Quanming Luo,Mingyang Qiu,Lei Liu

doi:10.3390/en14237901

Qingqing He, Quanming Luo + Show 2 more

Open Access

https://doi.org/10.3390/en14237901

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Journal: Energies	Publication Date: Nov 25, 2021
Citations: 4	License type: CC BY 4.0

Affiliation: Chongqing University, Wuhan University of Technology

Abstract

Active power factor correction converters are often introduced as the front stage of power electronic equipment to improve the power factor and eliminate higher harmonics. A Boost or Buck-Boost converter operating in discontinuous current mode is always adopted to achieve high power factor correction. In addition, the input current contains a large amount of higher harmonics, and a low-pass input filter is commonly adopted to filter it out. In this paper, a single-stage high-frequency AC/AC converter is taken as an example to demonstrate the design method of a passive low-pass filter. Firstly, the input side of the grid needs to meet the power factor and harmonic requirements. The preset parameters are set to a range to characterize the performance of the LC filter. The quantitative design method of input filter is proposed and summarized. Moreover, the sensitivity of the filter parameters is analyzed, providing a direction in practical applications. Preset parameters are all proved to conform to the preset range through PSIM simulation. Finally, a 130-W prototype is established to verify the correction of proposed design method. The power factor is around 0.935 and harmonic content in the input current is about 26.4%. All requirements can be satisfied.

Highlights

In traditional electrical equipment, uncontrolled diode rectifiers or thyristor phasecontrolled rectifiers with a large capacitor are often used to produce DC voltage [1,2]
Due to the nonlinearity of diodes and thyristors, the AC input current contains a large amount of harmonics, resulting in high total harmonic distortion (THD) and low input power factor (PF)
The high harmonic currents might cause device malfunction, cause power substation overheating, interfere with the electrical devices nearby [3,4], etc. This prompted the establishment of power quality standards for household product emission limits (e.g., IEC555.2, IEC 61000-3-2, etc.)

Summary

Introduction

In traditional electrical equipment, uncontrolled diode rectifiers or thyristor phasecontrolled rectifiers with a large capacitor are often used to produce DC voltage [1,2]. Due to the nonlinearity of diodes and thyristors, the AC input current contains a large amount of harmonics, resulting in high total harmonic distortion (THD) and low input power factor (PF). The high harmonic currents might cause device malfunction, cause power substation overheating, interfere with the electrical devices nearby [3,4], etc. This prompted the establishment of power quality standards for household product emission limits (e.g., IEC555.2, IEC 61000-3-2, etc.) [5].

Methods

Results

Conclusion