Non-linear modeling method of flyback printed flexible circuit (PFC) converter

Abstract

The invention relates to a non-linear modeling method of a flyback printed flexible circuit (PFC) converter. A peak current control-type Flyback PFC converter is modeled by a stroboscopic mapping method, numerical value simulation is performed on fast-scale unstable phenomenon on the basis of the model, a result shows that a period doubling bifurcation phenomenon occurs in a fast-scale unstable region, and boundary collision bifurcation and chaos are also generated. By the non-linear modeling method, the influence of a value of a circuit parameter on the system non-linearity is importantly researched, the position where a bifurcation point occurs and a corresponding circuit parameter value are specially analyzed by calculation of Jacobian matrix characteristic root, so that a certain theoretical basis is provided for designing a flyback PFC.

Description

technical field [0001] The invention relates to a flyback PFC converter, in particular to a nonlinear modeling method for a flyback PFC converter, and belongs to the technical field of switching power supplies. Background technique [0002] In recent years, Flyback PFC converters have been widely used in high-power power electronic circuits as an effective means to suppress harmonic pollution to solve the increasingly serious problem of harmonic pollution to the power grid. Due to the presence of nonlinear devices such as switches and multipliers, the Flyback PFC converter is essentially a strongly nonlinear system. Therefore, using the nonlinear dynamic method to study the working characteristics of the PFC converter has become a hot spot in the current academic and engineering circles, and the research on nonlinear modeling has also received more and more attention. [0003] While the modeling methods of PFC converters have made continuous breakthroughs, the research on n...

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Problems solved by technology

In 2010, Orabi studied the nonlinear behavior of the PFC converter under different load conditions, gave the load range of the PFC converter under stable operation, and specifically analyzed the sub-harmonic oscillation caused by the period-doubling bifurcation. This method It is only suitable for two-stage PFC converters. For single-stage PFC circuits, this method cannot well reflect the nonlinear behavior of single-stage PFC circuits because the input voltage changes continuously within a cycle.

In 2013, Tse further analyzed the reasons for the nonlinear phenomenon of switching power supply, and gave the influence of different switching frequencies on the nonlinear phenomenon of the system. However, this paper did not further analyze the relationship between the switching frequency parameters and the nonlinear phenomenon. Focused on a non-linear suppression method

However, the calculation of the bifurcation point parameters in this paper is still through the method of computer graphics, and it is impossible to give accurate values.

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