Experimental Measurements of Near Electric Field for AC/DC LED Lamp

Recent years have been marked by the evolution of LED lamp applications in homes or electric vehicles such as lighting or signaling systems. Many international standards are designed to protect electronic devices caused by emissions radiated by other electrical systems. This paper studies the radiated interference of electric field caused by a LED Driver lamp, and the lamp itself with the probes of type ROHDE Schwarz by a scan near field (NFS) with a 0.5 cm pitch above LED driver supplied by an alternative source of 220 V. To identify the most significant radiated emission zones of the shape of the electric field for the three components (E
X
, E
Y
, E
Z
) in the spectrum domain. The electric radiation was quantified and compared in the Z-direction for both shielded and unshielded cases. In the first time partial shielding which presents the most intense shielding elements using Aluminum foils of thickness about 0.5 mm was used. Moreover, in the second time, the total shielding of the entire driver circuit was used. Double shielding (partial and total), where has been shown that the shielding is one of the best solutions to reduce radiated emissions, and protects the nearby electronic systems.