publication . Doctoral thesis . 2014

'n Saamgestelde drywingselektroniese tussenkringmutator as deurloopspanningsbron

Open Access
  • Published: 08 May 2014
  • Country: South Africa
Abstract
M.Ing. (Electrical and Electronic Engineering) The South African Railways covers a total distance of some 24 000 km, making use of a signalling network of 1000 interlocking systems. This comprises of the order of 1000 signalling houses each with its own unlnterruptible power supply system of which a DC·AC converter Is one of the components. Due to the requirements by Spoomet, high frequency (ultrasonic) chopper technology had to be used. This treatise describes the design and development of a 3 kVA composite DC·AC converter with an ultrasonic AC link for this application. In the primary converter (centre tapped topology) ZVS Is achieved by good circuit layout an...
Subjects
free text keywords: Power electronics, Modulation (Electronics)
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