Question 5 (15 marks) The output voltage of a Buck converter in figure 5 is maintained at 42 V while

Question 5 (15 marks) The output voltage of a Buck converter in figure 5 is maintained at 42 V while operating from a 60 V DC source. The switching frequency of the converter is 20 kHz. The minimum output power drawn by the load is 30 W. The converter must operate in the continuous conduction mode down to this minimum output SW in ip Figure 5 Show with the help of suitable sketches, that with continuous conduction of inductor current (a) V D and Vin where and Vn are the output and input voltages respectively, and in are the average output and input currents respectively and D is the duty cycle. Hence, determine the duty cycle of the converter 7 marks) [4 marks (b) Find the minimum inductance L required to meet the operating requirements. (c) Find the minimum capacitance required so that the output voltage ripple does not exceed 2 % of the output voltage. [4 marks]

 

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