Primary-side sensing for a flyback converter in both continuous and discontinuous conduction mode
Primary-side sensing for a flyback converter in both continuous and discontinuous conduction mode
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DOI：
10.1049/ic.2012.0195
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发表时间：
2012-06
期刊：
影响因子：
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通讯作者：
T. Vu;S. O’Driscoll;J. Ringwood
中科院分区：
文献类型：
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作者：
T. Vu;S. O’Driscoll;J. Ringwood
初级侧检测是一种基于双稳态器的方法，用于从初级绕组（或辅助绕组）估计反激式转换器的输出电压。近年来，针对工作在断续导通模式（DCM）下的反激式变换器，提出了各种不同的反激式变换器定律。然而，由于难以补偿次级绕组中的电压降，因此没有考虑扩展到连续导通模式（CCM）。从利用励磁电流和Transformer模型预测绕组电压降的可能性出发，提出了一种新的观测器方法，该方法在CCM和DCM两种模式下都能准确、平滑地工作。该方法可以与任何控制器组合以提供输出电压调节或输出电流调节。通过仿真验证了所提出的传感技术。（6页）
Primary-side sensing is an observer-based approach to estimate the output voltage of flyback converters from a primary winding (or an auxiliary winding). Various observer-laws have been recently developed for flyback converters operating in discontinuous conduction mode (DCM). The extension to continuous conduction mode (CCM), however, has not been considered due to the difficulties in compensating for the voltage drop in the secondary winding. From the possibility to predict the winding voltage drop using the magnetizing current and the transformer model, this paper presents a new observer method that can work accurately and smoothly in both CCM and DCM. The methodology can be combined with any controller to provide either output voltage regulation or output current regulation. The proposed sensing technique is verified by simulation. (6 pages)