FLC-FPGA based digital controller for boost PFC SMPS without current measurement

Abstract

Diode based bridge rectifiers (AC to DC power converters) are the widely used power supplies. The major drawbacks of the conventional diode bridge rectifiers and thyristor-based rectifiers (nonlinear loads) are low power factor and high current harmonics in AC supply. This paper presents the design of a digital controller for continuous conduction mode boost converter with power factor correction on Xilinx FPGA. It is designed to minimize or reduce input current harmonic distortion by reducing the total harmonic distortion (THD) and improving the power factor of power supplies. The pre-calculated duty cycle control is implemented in FPGA for power factor correction in order to avoid the costly and complex process of current measurement. To obtain stable output voltages even in the presence of uncertainties (load variations) and disturbances (input voltage variations) a voltage loop with a fuzzy logic controller is included.