The study of 2-D skin-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) non-sinusoidal 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. Time-varying instantaneous ohmic resistances can be also defined in sinusoidal steady-state as well as in generic operating conditions.
Resistive losses of conductors carrying SMPS current waveforms
FEMIA, Nicola;LAMBERTI, PATRIZIA;SPAGNUOLO, Giovanni;
2002
Abstract
The study of 2-D skin-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) non-sinusoidal 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. Time-varying instantaneous ohmic resistances can be also defined in sinusoidal steady-state as well as in generic operating conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
