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http://dx.doi.org/10.6113/JPE.2019.19.1.190

Sampled-Data Modeling and Dynamic Behavior Analysis of Peak Current-Mode Controlled Flyback Converter with Ramp Compensation  

Zhou, Shuhan (Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle, Ministry of Education School of Electrical Engineering, Southwest Jiaotong University)
Zhou, Guohua (Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle, Ministry of Education School of Electrical Engineering, Southwest Jiaotong University)
Zeng, Shaohuan (Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle, Ministry of Education School of Electrical Engineering, Southwest Jiaotong University)
Xu, Shungang (Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle, Ministry of Education School of Electrical Engineering, Southwest Jiaotong University)
Cao, Taiqiang (School of Electrical Engineering and Electronic Information, Xihua University)
Publication Information
Journal of Power Electronics / v.19, no.1, 2019 , pp. 190-200 More about this Journal
Abstract
The flyback converter, which can be regarded as a nonlinear time-varying system, has complex dynamics and nonlinear behaviors. These phenomena can affect the stability of the converter. To simplify the modeling process and retain the information of the output capacitor branch, a special sampled-data model of a peak current-mode (PCM) controlled flyback converter is established in this paper. Based on this, its dynamic behaviors are analyzed, which provides guidance for designing the circuit parameters of the converter. With the critical stability boundary equation derived by a Jacobian matrix, the stable operation range with a varied output capacitor, proportional coefficient of error the amplifier, input voltage, reference voltage and slope of the compensation ramp of a PCM controlled flyback converter are investigated in detail. Research results show that the duty ratio should be less than 0.5 for a PCM controlled flyback converter without ramp compensation to operate in a stable state. The stability regions in the parameter space between the output capacitor and the proportional coefficient of the error amplifier are enlarged by increasing the input voltage or by decreasing the reference voltage. Furthermore, the ramp compensation also can extend to the stable region. Finally, time-domain simulations and experimental results are presented to verify the theoretical analysis results.
Keywords
Flyback converter; Peak current-mode control; Ramp compensation; Sampled-data modeling; Stability boundary;
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