| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系碩士班 === 101 === When a boost converter operates under top current control in current-continuous mode with duty cycle greater than 0.5, current experiences perturbation and results in oscillations, also known as sub-harmonic oscillation, quasi-periodic oscillation, and period-doubling oscillation. These undesired oscillations which cause noise, disturb the switch frequency stability and generate higher peak current that significantly decrease the system power.
The purpose of this project is to design a 500 W boost power factor corrector that clears the bifurcation current, minimizes the power lost, promotes stability of frequency and increases lifetime of the system. To build the system controller, Proportional Integral Control (PI) and Pulse Width Modulation (PWM) are used. The difference between feedback voltage and voltage command is used by PI control to generate reference current and control current amplitude. The duty cycle is calculated with slope compensation to prevent oscillation and reach the goal of stabling frequency and power factor correction.
According to the system structure and mathematical algorithms in this thesis, the analysis and simulation results prove that the proposed algorithm actually reduce the effect of perturbation, make the system stable and increase the system efficiency. It successfully achieves on the Renesas microcontroller (RX62T).
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