M.Ing. / A constant demand exists for ever decreasing size in switch mode supplies. The first step has been the introduction of resonant mode converters. Such converters typically consist of a resonant tank, a transformer and an input or output filter. The soft-switching characteristics of these converters allow an order of magnitude higher frequency, thus reducing the size of the reactive components. The next logical step towards a smaller package is introduced, namely the electromagnetic integration of the resonant tank and, if possible, the transformer into a single component, which; not only saves mass and volume, but can also reduce manufacturing costs. The particular converter investigated is the well known series resonant converter. It is shown that the necessary capacitance can be achieved by using a bifilar primary and the leakage inductance of the transformer replaces the physical inductor. Simulation of a suitable distributed circuit network indicates the same frequency domain characteristics and time domain waveforms for both the integrated component, and the discrete inductor, capacitor an transformer in series. Possible configurations for the integrated LCT-component are proposed, and theoretical analysis predicts an operating frequency in the MHZ region. Notwithstanding the complicated manufacturing, results show An integrated LCT-component, applied in a prototype 1 MHz power supply, with an efficiency of approximately 90 %. If manufacturing of the LCT-component allows an acceptable dimension and an acceptable resonant frequency, this can be a very competitive technology.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:uj/uj:13372 |
| Date | 02 March 2015 |
| Creators | Smit, Marthinus Christoffel |
| Source Sets | South African National ETD Portal |
| Detected Language | English |
| Type | Thesis |
| Rights | University of Johannesburg |
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