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本文分析了逆变电焊机的输入电路工作原理,滤波电容的存在是导致输入电流波形畸变的产生原因。指出逆变焊机输入电流波形的畸变降低了功率因数并对电网产生污染,同时也成为达到EMC认证标准的主要技术障碍。介绍了有源功率因数校正技术的基本工作原理和对改善逆变电焊机功率因数和电流波形畸变的作用。
This paper analyzes the working principle of the input circuit of the inverter welding machine, and the existence of the filter capacitor causes the distortion of the input current waveform. It is pointed out that the distortion of input current waveform of inverter welding machine reduces the power factor and pollutes the power grid, and it also becomes the major technical obstacle to reach the EMC certification standard. The basic working principle of active power factor correction technology and its effect on improving the power factor and current waveform distortion of inverter welding machine are introduced.