Evaluation method of disturbances to electronic equipment caused by showering noise

摘要

Malfunctions of electronic equipment caused by showering noise generated during the opening of electrical contacts have been found to be closely related the frequency of repeated pulses in the noise. It has become evident that the stress caused to electronic equipment by showering noise can be accurately reproduced by setting the pulse frequency to an appropriate value. Intermittent arc discharge between electrical contacts when opening a switch generates electrical noise (showering noise), which sometimes causes malfunction of electronic equipment. To analyze this phenomenon, the showering noise generated at the time of contact opening is measured using general home-use equipment as the load. The results reveal that the duration and frequency of the pulses contained in the measured showering noise are substantially different from the pulse conditions defined by the international standard for simulated showering noise.