Basic Concept of Current Commutation in Rectifiers - Homework 2 | ECE 481, Assignments of Electrical and Electronics Engineering

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Exercise 2 Basic Concept of Current Commutation in Rectifiers The following exercise helps to explain current commutation process in rectifiers. D1 1) ¥, 2ZS % (4) bo Nominal Values: Vs(rms) = 120 V at 60 Hz Ls = 5 mH Io =10A Problems 1. Execute Current_Commutation to obtain vg, Vo, and 5 is waveforms. 2. Plot vs, vLs, and the currents through the two diodes. Observe the process of current commutation from one diode to the other. Are the two commutations (from Di to D2, and vice versa) similar? Obtain an analytical expression for the commutation interval in terms of the circuit parameters and variables. Compare its value with the simulation results in Problem What will happen to the commutation intervals if the commutation inductance Lg is 3. 4. reduced by one-half and Ip is doubled? What if vs is doubled? 5. Change the input voltage v, waveform to be as shown below. Why is there no change in i, when the input voltage goes from +100V to OV, or from -100V to OV? vs i i vwi_} i i “100V4+------2+----: pare cerns teen ae Os Sms 1Ome a vit) Reference: Section 5-3-2, pages 87 - 89. i