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University of Wollongong ECTE412: Power Electronics and Drives Tutorial 3 1. Figure 1 resolving: (a) 2D-1, D, -(1-D) (b) (c) L = 90mH 2. A limp chopper supplies Vo = 10V to a resistive load of R = 5 from a Vs = 25V source. The substitution absolute frequency is fs = 10kHz. Find: (a) traffic ratio D (b) the minimum order of inductance L postulate to en convinced(predicate) that the inductance sure iL is continuous (c) minimum and maximum value of the inductor electric current iL if L is 2mH (d) power from source, expect L is as per part 1c (e) power to the load, assuming L is as per part 1c. Assume the load electric potential to be held constant by the capacitor. Answer: a) 0.4 b) 150uH c) 1.7A, 2.3 A d) 20W e) 20W 3. Consider a appoint converter in which the supply voltage Vs = 50V, the takings voltage is Vo = 30V, the induction is L = 250?H, the capacitance is C = four hundred?F and with a switching frequency of 10kHz. The converter supplies a load of R = 10. (a) affirm that the inductor current iL is continuous. (b) count the inductor ripple current (c) Sketch the inductor current waveform, noting the state of the switch in each section.

(d) Calculate the ripple voltage ?Vo at the sidetrack of the buck converter. a) CCM b) 4.8A d) 0.5% or 0.15V 4. Suppose that the buck converter of question 2 is reconfigured as a boost converter, in which the supply voltage Vs = 30V, the output voltage is Vo = 50V, and R, L, C and fs are unchanged. (a) Calculate the new moving in cycle. (b) Calculate the amount inductor current. (c) Show that the inductor current is cont! inuous. (d) Calculate the output ripple voltage relative to the come output voltage. Answer: a) 0.4 b) 5 A c) CCM d) 1% 5. If you regard to posit a full essay, order it on our website: BestEssayCheap.com

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