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为了保证逆变电焊机能在强干扰的环境中正常工作,本文分析了IGBT逆变焊机电源系统存在的主要电磁干扰,并在软件和硬件设计过程中采取了相应的措施。通过对逆变焊机电源电路的分析,认为其电磁干扰主要来自以下几个方面:输入电路电磁干扰、高频噪声、寄生参数引起的共模噪声和功率器件开关过程中产生的超高频噪声。在硬件设计中主要讨论了检测电路、主控板电源及隔离和接地等措施;在软件设计中主要讨论了软件陷阱技术、数字滤波和“看门狗”技术等。上述措施能够较好地抑制电磁干扰,并且焊机对周围设备的干扰和电网的污染也控制在有关电磁兼容标准指标之内。
In order to ensure the normal operation of the inverter welding machine in a strong interference environment, this paper analyzes the main electromagnetic interference in the IGBT inverter welding machine power supply system, and take corresponding measures in the software and hardware design process. Through the analysis of inverter welding power supply circuit, it is believed that the electromagnetic interference mainly comes from the following aspects: input circuit electromagnetic interference, high frequency noise, common mode noise caused by parasitic parameters and ultra-high frequency noise generated during power device switching . In the hardware design, it mainly discusses the detection circuit, main control board power supply and isolation and grounding measures. In the software design, the software trap technology, digital filter and watchdog technology are discussed. The above measures can better suppress the electromagnetic interference, and the welder’s interference to the surrounding equipment and the pollution of the power grid are also controlled within the relevant EMC standards.