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LINE SIDE BEHAVIOUR OF UNCONTROLLED RECTIFIER BRIDGES WITH CAPACITIVE DC SMOOTHING
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| Author(s) |
M. Grötzbach; B. Draxler |
| Abstract |
Small power rectifier bridges with capacitive dc smoothing work generally with a discontinuous dc current. This leads to significant deviations in the spectrum of the line harmonics compared with the known values of a good dc current smoothing. Starting from the differential and switching equations at the dc side, an analytical based direct solution of the steady state problem is proposed via difference equations. The calculation of the unknown switching points is carried out numerically due to the analytical effort. The line current can easily be obtained from the time behaviour of the dc current and with the help of a FFT-standard routine the associated spectrum is evaluated. Circuit data line impedance and dc capacitor as well as the operating point given by the dc output current are used as parameters. The results show the influence of these parameters on the line harmonics in amplitude and phase as well as the behaviour of the fundamental harmonic content and the displacement factor. |
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| Filename: | Unnamed file |
| Filesize: | 687.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-11 by System |
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