Design of a PFC converter

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Dr. Stumpf Péter Pál
Department of Automation and Applied Informatics

Nowadays we cannot imagine any modern electronic application without power factor correction. Power Factor Correction (PFC) shapes the input current of the power supply to be in synchronization with the mains voltage, in order to maximize the real power drawn from the mains. In a perfect PFC circuit, the input current follows the input voltage as a pure resistor, without any input current harmonics.

We can achieve this by many ways, I included one in my final project. First I wrote about the definition and theoretical background of the PFC converter. I discussed the operation, the state-space model and the non-ideal boost converter. After that I started the simulation with a simple boost converter and added parts to the circuit step by step (e.g. current control, voltage control, rectifier bridge, AC voltage source) to achieve the final PFC converter. I investigated the dynamic behavior of the converter in four different ways (changing the reference voltage, the power output, taking the resistor component of the inductor into account and taking the resistor component of the inductor and the voltage drop into account). Lastly I selected the appropriate components of the converter.


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