Reliability-Operational Analysis of the LED Lighting Module Including Electromagnetic Interference

Abstract

This article presents the issues related to the functioning and reliability and operational analysis of light-emitting diode (LED) type lighting modules, which are used in the railway technology. These devices operate in different electromagnetic environment conditions in the vast railway area. In the railway area, there are intentional and unintentional electromagnetic (stationary and mobile) interference which affect the operation process of the LED type lighting modules. In the article, the electromagnetic compatibility tests of the lighting module with a converter were carried out with the use of the electromagnetic interference (EMI) receiver of the ESCI3 type and the NNB-51 artificial network. As a result of the carried-out electromagnetic compatibility (EMC) tests, the exceeding of permissible levels of the value of conducted interference emissions was found. The electromagnetic interference of this frequency range has an impact on the operation process of the lighting module with a converter, therefore, by using the appropriate relationships, the values of the probabilities of the system staying in the distinguished operation states were calculated (e.g., in two states of partial suitability distinguished in the LED lighting module due to parallel coupling through reference impedance Z and capacity C). The considerations presented in the article related to the LED type lighting module with regard to electromagnetic interference allow for numerical assessment of different types of (technical and organisational) solutions that can be implemented in order to minimise the electromagnetic interference impact on the system functioning.