Applications of describing functions to estimate the continuous and discontinuous conduction mode for a DC-to-DC buck converter
Applications of describing functions to estimate the continuous and discontinuous conduction mode for a DC-to-DC buck converter
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DOI：
10.1049/ip-epa:20000589
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发表时间：
2000-11
期刊：
影响因子：
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通讯作者：
S. C. Chung;S. R. Huang;C. I. Ln
中科院分区：
文献类型：
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作者：
S. C. Chung;S. R. Huang;C. I. Ln
对于DC-DC降压转换器，导体的性能对于在连续导通模式（CCM）或不连续导通模式（DCM）下操作的转换器是显著不同的。针对饱和电感，讨论了CCM和DCM的工作条件。结果表明，电感对变换器工作在CCM和DCM模式下起着至关重要的作用。众所周知，当负载较大时，电感器的电感总是变化的。这是因为当电流负载很大时，电感总是饱和或滞后。因为电感是非线性的，所以在大电流情况下很难估计非线性电感的实际值。利用双输入描述函数法，可以对非线性电感进行线性化，并在大电流情况下估计电感。可以看出，当电感器的电感饱和时，降压转换器的不连续导通模式（DCM）的工作区域将急剧扩展，这意味着转换器将容易地工作在不连续导通模式。一个实验例子验证了这些结果。
For a DC-to-DC buck converter, the performance of the conductor is significantly different for the converter operating on the continuous conduction mode (CCM) or discontinuous conduction mode (DCM). The operating condition on the CCM and DCM is addressed for a saturated inductor. It is shown that the inductor plays an essential role for the converter operating on the CCM and DCM. It is known that when the load is large, the inductance for the inductor always changes. This is due to the fact that when the current load is large, the inductance always suffers from saturation or hysteresis. Because the inductance is nonlinear, it is very difficult to estimate the actual value for the nonlinear inductance during large current situations. With the dual-input describing function method, the nonlinear inductor can be linearised and the inductance can be estimated during the large current situations. It can be shown that when the inductance of the inductor is saturated, the operating region of the discontinuous conduction mode (DCM) of the buck converter will extend drastically, which means the converter will easily operate in the discontinuous conduction mode. An experimental example verifies these results.