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The applications of describing functions to
estimate the nonlinearinductance for large power filter
design
Chingyei Chung, S.; Huang, S.R.;
Jen-So Huang; Chaio, S.Y. Summary:
Power Engineering Society
Winter Meeting, 2000. IEEE
Volume 3, Issue , 23-27
Jan 2000 Page(s):2284 - 2289 vol.3
Digital Object
Identifier
10.1109/PESW.2000.847710
Because the inductance is nonlinear, it is very difficult to estimate the actual value for the nonlinear inductance during large current situations. In this paper, the authors explore the saturation phenomenon for a nonlinear inductance. With the describing function method, one can linearize the nonlinear inductor and then estimate the inductance during large current situations. Therefore, the bandwidth for low-pass, high-pass and notch filters can be also calculated very accurately.
It can be found by
the describing function method that when the current is
very large, the corner frequencies or bandwidth
frequencies will drift to a larger value in the low-pass
filter. The drift value of bandwidth frequencies can be
easily calculated by the describing function. This
phenomenon can be verified by simulation and
experimental results
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