Abstract
Power Factor Correction (PFC) converters are widely used in engineering. A classical PFC control circuit employs two complicated feedback control loops and a multiplier, while the One-Cycle-Controlled (OCC) PFC converter has a simple control circuit. In OCC PFC converters, the voltage loop is implemented with a PID control and the multiplier is not needed. Although linear theory is used in designing the OCC PFC converter control circuit, it cannot be used in predicting non-linear phenomena in the converter. In this paper, a non-linear model of the OCC PFC Boost converter is proposed based on the double averaging method. The line frequency instability of the converter is predicted by studying the DC component, the first harmonic component and the second harmonic component of the main circuit and the control circuit. The effect of the input voltage and the output capacitance on the stability of the converter is studied. The correctness of the proposed model is verified with numerical simulations and experimental measurements.
Highlights
Power Factor Correction (PFC) plays an important role in electrical engineering [1]
The design of the voltage control loop is of great importance because its main objective is achieving a stable system and a near unity power factor [4]
The dynamics of the PFC converter depends on these two control loops
Summary
Power Factor Correction (PFC) plays an important role in electrical engineering [1]. A PFC converter takes AC voltage as its input and outputs DC voltage. According to Floquet theory, the stability of the converter is identified by calculating the eigenvalues of the transition matrix of the system Another important method is the method of double averaging, which is based on the first harmonic component in the PFC converter line frequency model [14]. The method of double averaging is adopted to predict the non-linear dynamics of the OCC Boost PFC converter. This method has been applied to the traditional PFC converter, there is still a problem when applying it to the OCC PFC converter, because the control circuits in the two converters are totally different and as a result, some new consequences will occur in the OCC PFC converter. The computation is based on the exact non-linear model of the OCC PFC converter and the conclusions are meaningful in the design process of the converter
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