Characteristic of Conducted EMI in Compact Fluorescent Lamps Application Assessment based on CISPR-11

This paper presents the assessment of aggregated conducted emission resulted from dynamic interaction of multiple frequency sources in grid in the frequency range of 9 kHz to 150 kHz. The study involves multiple Compact Fluorescent Lamps (CFL) connected in a typical indoor lighting configuration. Based on the current standardized Intermediate Frequency Bandwidth (IFBW) laid out in CISPR-11 (Band A), the aggregation by dynamic interaction of highly volatile interference signals generated by these lamps is inadequate to represent the peak total emission. This paper discusses this specific issue accompanying measurements of conducted Electromagnetic Interference (EMI) in this particular multi-converter system. Our measurement results confirm the phenomenon with simple mathematical theorem and simulation illustrations.