On the distribution of AC and DC winding capacitances in high-frequency power transformers with rectifier loads
2011 (English)In: IEEE Transactions on Industrial Electronics, ISSN 0278-0046Article in journal (Refereed) Published
In this paper a method to adjust the AC winding capacitance of high-voltage high-frequency transformers by means of a winding-rectifier integration is described. First a theoretical background to the method is given. From the theory, an equivalent circuit describing the characteristics of the combination of the transformer and the rectifier is derived. The derived circuit introduces the concept of a DC-capacitance. Finally, the equivalent circuit and the method itself are verified by means of experiments on a transformer-rectifier system from an industrial application with the ratings 70 kV, 30 kW, 25 kHz. The results from the experiments show that it is possible to vary the AC component of the winding capacitance from a few percent up to 95 percent of the total winding capacitance. This means that it is virtually free to choose between AC or DC capacitance during the design stage. This is very important in applications such as resonant converters with transformers having secondary windings connected to rectifiers with capacitive output filters.
Place, publisher, year, edition, pages
Capacitance, Converters, Equivalent circuits, Integrated circuit modeling, Power transformers, Rectifiers, Windings, high-voltage conversion, resonant converters, transformer parasitics, winding capacitance
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-25218DOI: 10.1109/TIE.2010.2055773ISI: 000289478000030ScopusID: 2-s2.0-79954464727OAI: oai:DiVA.org:kth-25218DiVA: diva2:356577
QC 201010132010-10-132010-10-132011-05-02Bibliographically approved