Slow-Scale Instability of Single-Stage Power-Factor-Correction Power Supplies
Slow-Scale Instability of Single-Stage Power-Factor-Correction Power Supplies
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DOI：
10.1109/tcsi.2007.902516
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
Dong Dai;Shengnan Li;Xikui Ma;C. Tse
中科院分区：
文献类型：
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作者：
Dong Dai;Shengnan Li;Xikui Ma;C. Tse
本文报道了单级功率因数校正（PFC）电源的慢尺度不稳定性，这是低功耗应用中流行的设计解决方案。该电路采用升压变换器和正激变换器的级联配置，它们共享一个有源开关并在不连续传导模式（DCM）下工作，以提供输入PFC和严格的输出调节。主要结果由“精确的”逐周期电路仿真给出。慢尺度不稳定性对可获得的功率因数的影响用总谐波畸变来说明，总谐波畸变可以通过对输入电流进行快速傅里叶变换得到。慢尺度不稳定性通常表现为线周期内的局部振荡。基于buck变换器DCM的临界条件，进一步研究了这种不稳定性的潜在机制。研究发现，边界碰撞是造成这一现象的根本原因。此外，还证明了这里观察到的边界碰撞实际上是一个非光滑的neimmark - sacker分岔。最后给出了实验结果进行验证。
This paper reports slow-scale instability in a single-stage power-factor-correction (PFC) power supply, which is a popular design solution for low power applications. The circuit employs a cascade configuration of a boost converter and a forward converter, which share an active switch and operate in discontinuous-conduction mode (DCM), to provide input PFC and tight output regulation. Main results are given by "exact" cycle-by-cycle circuit simulations. The effect of the slow-scale instability on the attainable power factor is illustrated in terms of total harmonic distortion which can be found by taking the fast Fourier transform of the input current. The slow-scale instability usually manifests itself as local oscillations within a line cycle. Based on the critical condition of DCM for the buck converter, the underlying mechanism of such instability is further investigated. It has been found that border collision is the underlying cause of the phenomenon. Moreover, it has been shown that the border collision observed here is effectively a nonsmooth Neimark-Sacker bifurcation. Finally, experimental results are presented for verification purposes.