How many states the PN sequence generator of DB20 have? • What is the length of PN sequence generator of DB20?

Question 2 a) Briefly explain the de chopper, inverter, controlled rectifier and ac voltage controller. b) A buck-boost regulator as shown in Figure 2 has an input voltage, Vs = 12 V. The duty cycle, k = 0.35 and the switching frequency is 30 kHz. It also has an inductance, L = 200 µH, filter capacitance, C = 440 µF. The average load current, Ia 1.25 A. Determine the: i. average output voltage, Va, ii. peak-to-peak output ripple voltage, AVc, iii. peak-to-peak output ripple current of inductor, AI, iv. peak current of the transistor, Ip, V. critical values of L and C, and vi. critical values of L and C if Vs is increased to 14 V. Estimate the change in percentage for the critical values of L and C. is Vs C Load Vo, Vs VC i, Ia Figure 2

Q3) A. A step down de chopper is connected to an R=52 and L=10 mH. The de supply voltage is 100 V. The chopper is switching at a frequency of 1 kHz with a duty cycle of 50%. Determine the load current, lo and the peak to peak ripple current as an absolute value and as percentage of de value.

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