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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 oftenness is fs = 10kHz. Find: (a) traffic ratio D (b) the minimum nurture of inductance L postulate to en for certain that the inductance sure iL is continuous (c) minimum and maximum value of the inductor incumbent 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 product voltage is Vo = 30V, the induction is L = 250?H, the capacitance is C = cd?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) enumerate 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 rig 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 clientele cycle. (b) Calculate the amount inductor current. (c) Show that the inductor curre nt is continuous. (d) Calculate the output ! ripple voltage relative to the comely output voltage. Answer: a) 0.4 b) 5 A c) CCM d) 1% 5. If you indirect request to posit a full essay, order it on our website: BestEssayCheap.com

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