publication . Doctoral thesis . 2014

'n Saamgestelde drywingselektroniese tussenkringmutator as deurloopspanningsbron

Open Access
  • Published: 08 May 2014
  • Country: South Africa
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...
free text keywords: Power electronics, Modulation (Electronics)
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