Question

Question 3 1) Consider a converter circuit in figure 1. What kind of topology is it? [2Marks] 2) Now more practical example, let assume: V=300V, D=0.5 1,=30A f=100kHz Vswitch drop=0.0V And the figure 1 below has a extra magnetizing winding Lopes Soad Figure 1 (1) Calculate the rated output power and equivalent load resistance [4Marks] (1) If DI =IL.max -IL.min is equal to 0.2A. Calculate L, when V=V [6Marks] (iii) Sketch the current and voltage waveform of an inductance for the converter circuit shown in figure 1. [8Marks) Total [20Marks]

Answer 1

IL To + C' V R Load ". This circuit is 0% Buck converter, a type of Gc - DC Converter. It step down the vol. tage Also called as U-I converter &s=100kHz Io = 30A 2) given vd = 300v Diis Vswitch drop =0 ) Know that Vo= avd Vor.SX 300 out put voltage Vo a 1500 we - Vo lo - Rated output power = 150 x 30 IP = 4.5kw from circuit it can be seen R- -.150 Vc Io 30 across inductor is voltage ii). R=572 we know that k=LAIL st given VL=No=1500 DI2 = Ilmar I min.2 07=40+$) - to 105 L =VLAT DIL substitut values yields = 7.5mH La 150xlos C 2

L=7.5m H iv) 71 to doramo Il (current across inductor) waveform for Oct< DT =vd-vo at Scina favo Vd-Vodt {{(tla + Il min L Nd-Vo + for DT <tLT di et = - v (dis-veldt (lt) = Ilmax - Volt-8T) switch DT V=Ld IL at so, dipferentation of Ramp is Ilmax unit step signal IL graph of IL 1 OH 2 Ilmia L V At of ygraph (of ♡
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