Abstract
In this chapter, the order-reduced and the full-order nonlinear equivalent circuit model of quasi-resonant converter (QRC) are established based on the nonlinear switching function. Then, by using the ESP method, the analytic periodic solutions of the QRC can be obtained. The order-reduced model is relatively simple, since it ignores the dynamic characteristics of the resonant variables. And only the low-frequency state variables, such as the filter inductor current and the output capacitor voltage, are analyzed based on the order-reduced model. The analytic periodic solutions of both the resonant variables and the filter variables are obtained based on the full-order model. The results show that the higher harmonic components in the resonant variable have no significant influence on the output filter state variables, thus the simplification of the order-reduced model is reasonable. It can also be seen that based on the full-order model, the mathematical description of the QRC has the same form as that of the PWM converter. Therefore, the analysis of the two types of converters can be unified by the ESP method.
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Chen, Y., Zhang, B. (2019). Analysis of PFM Quasi-resonant DC/DC Converters Based on ESPM. In: Equivalent-Small-Parameter Analysis of DC/DC Switched-Mode Converter. CPSS Power Electronics Series. Springer, Singapore. https://doi.org/10.1007/978-981-13-2574-8_8
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DOI: https://doi.org/10.1007/978-981-13-2574-8_8
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