كامران مرادي گل مكاني

With the advent of wide bandgap components, it became possible to build high power converters. Switching Mode Power Supplies (SMPS) with power factor correction (PFC) have become very popular in order to increase power density and meet low frequency harmonic standards. However, due to the high frequency switching current, high-frequency conducted emissions also appear. Therefore, to protect the network against these emissions and to comply with high frequency harmonic standards, electromagnetic interference (EMI) filters are necessary. The design of these EMI input filters is one of the subjects for which significant efforts have always been made to develop. In this thesis, regulations for the design and implementation of the switching power converter for power factor correction are presented at the beginning. The result of this design is an operational converter in the critical conduction mode with a rated power of 80 watts, which uses the L6562A integrated circuit. Then, the amount of noise produced by the converter has been investigated using mathematical models, simulation software, and also laboratory results. The main source of common mode noise in this converter is caused by the imbalance of parasitic capacitances in the propagation path, which can be reduced by reducing the parasitic capacitor of the drain node of the MOSFET or adding an external parasitic capacitor to establish the balance. In addition, by analyzing the performance of the converter at different working points, it was found that one of the worst working conditions in terms of differential mode noise generation is 220V input voltage and 80W output power, and the noise level in these conditions is 86dBμV, which is the basis of the filter design. For the purpose of this design, optimal volume formulations have been used, and finally, the total volume of the resulting filter is equal to 6.5 cm3. Finally, by comparing the laboratory measurements of the noise spectrum with the analysis and expectations obtained from calculations and simulations, the correctness of the proposed filter design approach has been eva‎luated.

تداخل الكترومغناطيسي , نويز حالت مشترك , نويز حالت تفاضلي , فيلتر تداخل الكترومغناطيسي غيرفعال , اصلاح‌كننده ضريب توان

Electromagnetic Interference (EMI) , Common Mode (CM) noise , Differential Mode (DM) noise , Passive EMI filter , Power Factor Correction (PFC)

kamran moradi golmakani

hossein heydari