Ripple current and electrical noise characterization of DC BUS capacitors for future power electronics

Teppei Akiyoshi, Guanghui Wang, Heath Hofmann, Mike Lanagan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

For automotive applications there is an increasing demand to miniaturize power electronics circuits and operate at higher temperatures. Active SiC-based devices operate at high frequency which decreases circuit dimensions. Passive components, such as the DC-BUS capacitor, must complement new SiC technology. In this study the high frequency performance of DC-BUS capacitors in a DC-DC converter was tested. The relationship between ripple voltage and ripple current were explored as a function of switching frequency (fs) and total DC-BUS capacitance. The DC-BUS capacitor's charging and discharging current was independent of the capacitance or switching frequency. The calculated necessary capacitance for DC-BUS capacitor was proportional to 1/fs and 1/fs 2 by assuming constraining condition of ripple voltage and ripple current, respectively. In addition, to minimize the DC-BUS capacitor size, the current density through the capacitor was calculated as proportional to fs and fs 2 by assuming constraining condition of ripple voltage and ripple current, respectively. Therefore, high current density performance will be important to miniaturize power electronic circuits by increasing switching frequency. DC-BUS current and DC-BUS voltage noise increased with increasing switching frequency over a wide frequency range. The benefit of using a multilayer ceramic capacitor (MLCC) to reduce noise was demonstrated.

Original languageEnglish (US)
Title of host publicationCARTS USA 2007
Pages144-156
Number of pages13
StatePublished - Dec 1 2007
Event27th Symposium for Passive Components, CARTS-USA 2007 - Albuquerque, NM, United States
Duration: Mar 26 2007Mar 29 2007

Publication series

NameCARTS USA 2007

Other

Other27th Symposium for Passive Components, CARTS-USA 2007
CountryUnited States
CityAlbuquerque, NM
Period3/26/073/29/07

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Industrial and Manufacturing Engineering
  • Safety, Risk, Reliability and Quality
  • Materials Science(all)

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