Simulink Simulation of Traditional Active Power Factor Correction Circuits

In this document, we explore the Simulink simulation of traditional active power factor correction (APFC) circuits and introduce the hysteresis control method as the primary control strategy. Traditional APFC circuits are designed to improve power factor in electrical systems by employing active components to correct adverse power factor effects. The simulation utilizes Simulink's Power Systems toolbox to model switching converters, where key components like IGBTs/MOSFETs, diodes, and LC filters are implemented using Simulink's semiconductor blocks with proper snubber circuits and thermal considerations.

The hysteresis control method, implemented through a custom control subsystem, regulates current and voltage by comparing actual values with reference signals using hysteresis comparators. This creates a bounded control band where switching occurs when the error exceeds predefined upper/lower thresholds. The control algorithm can be programmed using MATLAB Function blocks or Stateflow charts to define the switching logic, incorporating current sensing through Hall-effect sensor models and voltage feedback via measurement blocks.

Through the integration of these concepts, we can effectively analyze the performance and efficiency of traditional APFC circuits, examining parameters like total harmonic distortion (THD), power factor values, and dynamic response characteristics using Simulink's FFT analysis and power measurement tools.