The study of 2-D skin-effect and proximity-effect transient problems by means of a formulation based on a magnetic vector potential A and on a scalar potential φ is presented. As an application of the proposed method, the equivalent per-unit length resistance of conductors carrying typical Switch-Mode Power Supplies (SMPS) nonsinusoidal current waveforms has been evaluated. The analysis clearly reveals that it depends both on switching frequency and duty-cycle and is rather different from dc and ac sinusoidal equivalent parameters. Some examples of evaluation of proximity losses in two adjacent conductors are also provided.
Resistive losses of conductors carrying SMPS current waveforms
FEMIA, Nicola;LAMBERTI, PATRIZIA;SPAGNUOLO, Giovanni;
2002-01-01
Abstract
The study of 2-D skin-effect and proximity-effect transient problems by means of a formulation based on a magnetic vector potential A and on a scalar potential φ is presented. As an application of the proposed method, the equivalent per-unit length resistance of conductors carrying typical Switch-Mode Power Supplies (SMPS) nonsinusoidal current waveforms has been evaluated. The analysis clearly reveals that it depends both on switching frequency and duty-cycle and is rather different from dc and ac sinusoidal equivalent parameters. Some examples of evaluation of proximity losses in two adjacent conductors are also provided.File in questo prodotto:
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