High-Frequency Disturbances of Modern Lamps, a Statistical Approach

The paper presents an analysis of the HF disturbances emitted by modern lamps such as Compact Fluorescent Lamps and Light Emitting Diodes lamps, based on a statistical approach. For a given lamp, the level of the conducted disturbances emitted in CISPR Bands A and B during the stepped frequency scan was recorded by an EMI Receiver and then, considered as a data sample selected from a statistical population containing all the possible values of the disturbance. Each of the resulting samples has been processed in order to find the best theoretical model fitting the empirical cumulative distribution function. As will be shown, this approach allows the identification of a specific signature for the emission of a given lamp, and the use of this signature in order to compare emissions or to predict different characteristics of the emission, including the probability to exceed limits.