  [WC]-type CSPNs are hydrogen-deficient Central Stars of Planetary Nebulae
showing strong stellar winds and a carbon-rich chemistry. We have analyzed new
high-resolution spectra of [WC]-type CSPNs with the Potsdam Wolf-Rayet (PoWR)
non-LTE expanding atmosphere models, using upgraded model atoms and atomic
data. Previous analyses are repeated on the basis of the current models which
account for iron-line blanketing. We especially focus on determining the
chemical composition, including some trace elements like nitrogen which are of
key importance for understanding the evolutionary origin of the
hydrogen-deficient Central Stars.
