Abstract
This chapter focuses on electromagnetic interference (EMI) effects of power electronic converters. This chapter also describes EMI measurement techniques and preventive measures. The switch-mode operation of power electronic converters results in current ripple mixed with the fundamental currents. Power electronic converters, such as rectifiers and inverters, tend to generate current-related interference at their input, injecting noise to the power grid, and voltage-related interference at their outputs, which may disturb operation of communication and control systems in proximity to the converter. Measurement of the peak EMI is important because of the ubiquity of impulsive sources and sensitivity of many types of electronic circuits to impulses. The peak detectors have a short charging time constant, in the order of a fraction of microsecond, and a very long discharging time constant, in the order of tens of seconds. EMI generated in power electronic systems usually exceeds the allowable levels, and it must be reduced. The most common means of EMI mitigation are low-pass filters, often called radio-frequency (RF) filters.
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