The thesis presents the development and implementation of a method for detecting electromagnetic interference caused by faulty switch-mode power supplies. The aim of the work was to verify the operation of a simple measurement circuit based on LED indication for detecting increased emission of interference. Switch-mode power supplies operate on the principle of high-frequency switching, which, in cases of inadequate filtering or component degradation, often leads to electromagnetic disturbances propagating through the power grid and into the surrounding environment.
For comparative analysis, a software-defined radio was used as a reference method, allowing visualization of the electromagnetic spectrum near the power supply. For each sample, the response of the interference detector was compared with the detected frequency disturbances on the software-defined radio. Measurements were carried out on 31 power supplies, where the condition of the device could be clearly determined in 24 cases. Of these, 11 were functioning properly and 13 were found to be faulty. In seven cases, the device's behaviour could not be reliably interpreted due to unclear or non-reproducible responses. The results showed a high level of consistency between the two methods, confirming the reliability of the developed detector for identifying faulty power supplies. Finally, the thesis outlines the potential use of the detector in industrial environments, where electromagnetic interference is often the cause of problems in the operation of electronic equipment.
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