Abstract
M.Ing.
Electromagnetic Compatibility (EMC) of electronic equipment is currently an important
design parameter. Layout play a significant role in the EMC of power electronic
converters. This thesis describes an investigation undertaken into the electromagnetic
effects of converter layout. Typical detrimental effects identified during experimental
work are presented. Possible causes for these effects are discussed. The experimental
work is based on a systematic approach, which starts with a basic single switch chopper
and ends in a split supply half-bridge converter. Interconnection modelling and SPICE
simulations of layout affects are investigated next. The focus falls on analytical equations
for extraction and simplified simulation circuits to make the process generally accessible.
Typical resonant frequencies present in some of the experimental circuits are investigated
with the help of analytically extracted parameters.
The possibility of minimizing detrimental layout effects through impedance matching of
interconnections and their terminations, is investigated next, since the previous section
quantified layout parameters. Distributed vs. lumped element modelling of
interconnections, and the boudary in between, are discussed. Simulation and
experimental results are presented.
Since maximum fuctionality and power, and minimum cost, per volume drives product
development, all elements of a circuit should be investigated for the possibility of
realizing secondary or even tertiary functions contributing to normal circuit operation.
This is the focus of the last part of this thesis. Employing interconnections as low-pass or
surge filters are investigated. Several waveforms are used to test experimental
interconnection structures. Lumped and distributed modelling of these strucutres are
discussed. The thesis concludes with a theoretical investigation into the possibility of
dissipation of surge-energy instead of reflection utilizing interconnection-structures. One
of these structures utilizes the skin- and proximity effect to realize low-pass behaviour.