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SINGLE PHASE SUPPLY IMPEDANCE: ITS MEASUREMENT AND INFLUENCE ON NON-LINEAR (RECTIFIER) LOADS
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| Author(s) |
Rex M. Davis; Alan R. Jewell |
| Abstract |
The impedance of single phase supplies plays an important part in determining the severity of harmonic currents drawn by non-linear loads and the consequent voltage disturbances experienced by other users. At present most electronic power supplies still use a diode bridge rectifier connected to the 220V/240V ac supply via simple line filter, and to a large electrolytic smoothing capacitor on the dc side. This arrangement produces high peak value, short duration current pulses giving rise to many harmonics. lt shows how supply impedance can be simply measured. The use of passive components to reduce harmonic currents is discussed, based upon computer simulated results. These enable comparisons to be made with more sophisticated active methods for power factor improvement, based on the modulation of a boost converter to create a sinusoidal envelope for the high frequency current ripple. |
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| Filename: | Unnamed file |
| Filesize: | 2.998 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-15 by System |
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