This paper proposes an efficient bridgeless power factor corrected (PFC) modified single ended primary inductor converter (SEPIC) for arc welding power supplies (AWPS). The overall configuration is composed of two converters: (1) a modified bridgeless SEPIC PFC converter, which is controlled by a PI controller to achieve a high power factor and fast response; and (2) a full bridge buck converter with high-frequency transformer for high-frequency isolation to ensure arc welding stability. The proposed system is simulated under different operating conditions of an AWPS. It is also tested in real time by a hardware-in-the-loop system based on a dSPACE DS1103 control board. The system performances are evaluated based on power quality indices such as power factor, total harmonic distortions of the AC grid current, and voltage regulation. The obtained results show that the proposed controller enhances the weld bead quality by keeping a constant current at the output and a stable arc, meet the international power quality standards and robustness for voltage regulation.

中文翻译：

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改进型无桥SEPIC PFC变换器改善弧焊电源电能质量

本文提出了一种用于弧焊电源 (AWPS) 的高效无桥功率因数校正 (PFC) 改进型单端初级电感转换器 (SEPIC)。整体配置由两个转换器组成： (1) 改进的无桥 SEPIC PFC 转换器，由 PI 控制器控制以实现高功率因数和快速响应；(2)全桥降压转换器，带高频变压器进行高频隔离，保证弧焊稳定性。所提出的系统在 AWPS 的不同操作条件下进行了模拟。它还通过基于 dSPACE DS1103 控制板的硬件在环系统进行实时测试。系统性能的评估基于电能质量指标，如功率因数、交流电网电流的总谐波失真和电压调节。