Abstract
To evaluate the distribution of common mode noise current generated by an LED lamp flowing on the lighting duct rail, radiation noise on the lighting duct rail is investigated by measuring the magnetic field distribution which correlates well with the common mode noise current distribution. The trough of the magnetic field distribution is observed around the position where the LED lamp is installed. When the duct rail is longer than the wavelength, the peaks and troughs of the magnetic field distribution on the duct rail appear every half wavelength. To examine the measurement result, a single wire model is proposed to simulate the distribution of the LED noise on the lighting duct rail and its result is compared with the measurement result. A good agreement between these results is obtained. This single wire model is successfully expressed both the duct rail part and the noise source part.
