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首页> 外文期刊>American journal of applied sciences >Electromagnetic Interference Mitigation for Inverter fed AC Drives
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Electromagnetic Interference Mitigation for Inverter fed AC Drives

机译：变频器供电的交流变频器的电磁干扰缓解

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Problem statement: In switched mode PWM inverter EMI noise occurs during high (dv/dt) transient period. This EMI noise is mitigated using Active Common mode EMI filter in front of the source. Approach: This study proposes a new active common mode Electromagnetic Interference (EMI) filter for switched mode PWM Inverter applications. The proposed filter was based on current sensing and compensation circuit which utilizes fast transistor amplifier for current compensation. The amplifier was biased with an isolated low voltage DC power supply. Hence it was possible to construct an active filter independent of the source voltage of equipment. Thus this filter could be used in any application regardless of working voltage. The proposed switched mode PWM inverter operated in 180° mode of operation. It's otherwise called as quasi square wave mode. Results: Simulation of output wave form was verified by using MATLAB Simulink model results and also its effectiveness had been verified hardware output wave forms. The hardware for this project was designed and developed for 50V, 50Hz three phase Fractional Horse Power (FHP) motor. Conclusion: In this Study the concept of the new active common mode EMI filter and quasi square PWM inverter has been proposed. The corresponding simulated output waveforms are verified with the Active Common mode EMI filter; it is possible to use low-voltage transistors for the amplifier by introducing coupling capacitors between the power line and amplifier circuit. The ACEF can be applied to various power electronic systems regardless of the working voltage. It helps in improving the performance of additional filter stages.
机译：问题陈述：在开关模式PWM逆变器中，EMI噪声在高（dv / dt）瞬态周期内发生。使用源前面的有源共模EMI滤波器可以减轻EMI噪声。方法：本研究提出了一种用于开关模式PWM逆变器应用的新型有源共模电磁干扰（EMI）滤波器。提出的滤波器基于电流检测和补偿电路，该电路利用快速晶体管放大器进行电流补偿。放大器用隔离的低压直流电源偏置。因此，有可能构造与设备的源电压无关的有源滤波器。因此，无论工作电压如何，该滤波器均可用于任何应用。拟议的开关模式PWM逆变器以180°的工作模式运行。否则称为准方波模式。结果：使用MATLAB Simulink模型结果验证了输出波形的仿真，并验证了硬件输出波形的有效性。该项目的硬件是为50V，50Hz三相分数马力（FHP）电动机设计和开发的。结论：本研究提出了新型有源共模EMI滤波器和准平方PWM逆变器的概念。相应的模拟输出波形由有源共模EMI滤波器验证；通过在电源线和放大器电路之间引入耦合电容器，可以将低压晶体管用于放大器。无论工作电压如何，ACEF均可应用于各种电力电子系统。它有助于提高其他滤波器级的性能。

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