Stability Analysis of Constant Current-Controlled Primary-Side Regulation Flyback Converter

被引:5
|
作者
Wang, Chong [1 ]
Sun, Daying [1 ]
Gu, Wenhua [1 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Elect & Opt Engn, Nanjing 210094, Peoples R China
关键词
Switches; Buck converters; Pulse width modulation; Stability analysis; Perturbation methods; Windings; Demagnetization; Constant current (CC) control; discrete-time analysis; peak current control; primary-side regulation (PSR) flyback converter; stability analysis; CURRENT ESTIMATION CIRCUIT; SMALL-SIGNAL MODEL; OUTPUT CURRENT; CONDUCTION MODE;
D O I
10.1109/JESTPE.2020.3010347
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In low power applications, primary-side regulation (PSR) flyback converter with discontinuous conduction modulation (DCM) mode is widely used to realize constant output current for its simple structure and low cost. In peak current control method, the output current can be predicted from the primary peak current, demagnetization time, and switching period. Based on the current prediction, a pulsewidth modulation (PWM) mode and a pulse frequency modulation (PFM) mode are used. However, as the output current cannot be sampled directly in PSR flyback converter, traditional small-signal modeling method based on the control and output variables cannot be used. Moreover, there is no stability analysis for these constant current (CC)-controlled PSR flyback converters. In this article, a discrete matrix analysis method is proposed to analyze the stability of CC-controlled PSR flyback converter. An iterative matrix of the control and output variable perturbations is obtained, and the stability can be acquired from the eigenvalues. Oscillation occurs in the above PWM mode, and a stable control is realized in PFM mode. An improved PWM mode is thus proposed and analyzed for stable control. The analysis is verified in a PSR flyback converter with 1.92 A.
引用
收藏
页码:4245 / 4253
页数:9
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