High power switched mode power supply

Neil, William (1999). High power switched mode power supply B.Sc Thesis, School of Computer Science and Electrical Engineering, The University of Queensland.

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Author Neil, William
Thesis Title High power switched mode power supply
School, Centre or Institute School of Computer Science and Electrical Engineering
Institution The University of Queensland
Publication date 1999
Thesis type B.Sc Thesis
Supervisor Mr Geoff Walker
Total pages 49
Language eng
Subjects 0906 Electrical and Electronic Engineering
Formatted abstract

The goal of this thesis was to research, design and build a switched mode power supply suitable for a high power audio amplifier application. The bulky and expensive line frequency transformers and large passive components were to be replaced by a more efficient (electrically and spatially) design. In order to be accepted by a community of audiophiles, this new supply must also in no way affect the sound quality of the amplifier to which it is supplying power.

To achieve this, a bridge converter was chosen (to handle the power levels and provide electrical isolation). It was decided to hard switch the bridge at a frequency of 200kHz. By switching at this frequency, not only could the size of the supply be reduced, but it ensured that switching noise was kept well away from the audible frequency range and could be easily filtered with a simple, first order LC filter.

The converter was designed and built. Testing proved that this was a viable replacement for the traditional amplifier power supply. Weighing less than a kilogram, having minimal output ripple, showing excellent load and line regulation and attaining efficiencies approaching 80% in its hard switched guise, this form of power supply for this application shows much promise and warrants further development.

Through the use of resonant switching techniques, planer transformers and controlled rectifiers, efficiencies over 90% and further reductions in size should be possible in future variants.

Keyword Power supply --- Design
Additional Notes * 4th year electrical engineering theses and information technology abstracts. 1999

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
Citation counts: Google Scholar Search Google Scholar
Created: Tue, 28 May 2013, 09:14:33 EST by Mr Yun Xiao on behalf of Scholarly Communication and Digitisation Service