This master's thesis presents the design, implementation, and experimental evaluation of an AC/DC boost
converter with active power factor correction (PFC). The aim of the thesis was to develop a converter
capable of stable conversion of AC mains voltage into DC voltage while improving input current quality and
achieving high energy eƯiciency.
The theoretical part describes the basic operating principles of AC/DC converters, the issues related to
power factor and current harmonic distortion, and the operation of the boost PFC topology. The main
functional blocks of the converter are also discussed, including the EMI filter, rectifier stage, boost
inductor, output capacitor, and control circuitry. Special attention is given to the integrated PFS7527H
controller, which combines the functions of a PFC controller and a power MOSFET transistor.
The practical part includes component dimensioning, PCB design, and implementation of the converter
prototype. A custom boost inductor using Litz wire and a ferrite core with an air gap was also designed and
manufactured. Experimental measurements were performed at diƯerent input voltages and load
conditions, confirming stable converter operation throughout the tested operating range.
The measurement results confirm the suitability of the converter design and the successful
implementation of the system. The converter provides stable output voltage, reliable operation, and
acceptable output voltage ripple even at higher loads.
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