Q2a i. Transformers in switched-mode power converters often use ferrite core materials. Alternatively, nanocrystalline m

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Q2a I Transformers In Switched Mode Power Converters Often Use Ferrite Core Materials Alternatively Nanocrystalline M 1 (64.42 KiB) Viewed 115 times

Q2a i. Transformers in switched-mode power converters often use ferrite core materials. Alternatively, nanocrystalline materials can be used in this application. Discuss the relative merits and demerits of ferrite and nanocrystalline core materials when used in a power converter's transformer. Chokes in switched-mode power converters often also use ferrite core materials. Alternatively, iron powder materials can be used in this application. Discuss the relative merits and demerits of ferrite and iron powder core materials when used in a power converter's choke. 8 marks Q2b Figure 02b shows a rectifier circuit using a thyristor. The AC supply voltage Vec is 230 V, and R.Avhas a resistance of 5000. Calculate the average value of Leif the thyristor is triggered at an angle a of 65º. d THI Rop 0 Figure 2b. Rectifier circuit 7 marks 02C A MOSFET is mounted onto a heatsink, and data for this arrangement are given in Table Q2(c). The MOSFET switches at a very low frequency and hence its switching losses can be neglected, and the only significant losses are its conduction losses. Calculate the MOSFET's junction temperature. Table 020). Data for MOSFET mounted on heatsink. Ambient temperature T 20°C MOSFET'S Rojo when at 20°C Rosa 25 ma RMS current conducted by MOSFET 16 A Total thermal resistance between MOSFET Ro 7°C junction and ambient Coefficient of rise in Rosion with temperature KO 1.1%/°C When answering this question, consider that a positive feedback mechanism must be present because: The power dissipation in the MOSFET causes a rise in its junction temperature and