Modeling and Analysis of Flyback Switching Power Converter using FPGA

This paper presents a modeling of Pulse Width Modulation (PWM) for conducted noise reduction in Switching Power Converters (SPC) using Field Programmable Gate Array (FPGA) based controller. Buck boost Flyback converter is the preferred choice among variety of switching power converters due to its low component count, cost-effective structure as well as its large dynamic range. Converters should act in agreement with Electro-Magnetic Compatibility (EMC) rules so that the Electro-Magnetic Interference (EMI) caused by switching cannot obstruct the normal operation of adjacent circuits and also the converter itself. In this paper, some techniques are used in switching converters to suppress EMI with emphasis on its conduction form. EMI analysis and evaluation of a conventional flyback converter is achieved by simulation results. According to the simulated results, the circuit and parameters of the converter are modified. Experimental results are included to verify the validity of the proposed method. The proposed model is easy to apply in practice for understanding, diagnosing and approximating EMI behaviors and to improve EMI in the topology design stage. The resulting model assumes a minimum number of noise sources and contains essential coupling paths that allow easy physical interpretations.