QUESTION #1 (25 Marks] a) With the aid of a diagram explain how a crowbar circuit may be used to protect a D.C power sup

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Question 1 25 Marks A With The Aid Of A Diagram Explain How A Crowbar Circuit May Be Used To Protect A D C Power Sup 1 (60.08 KiB) Viewed 21 times

QUESTION #1 (25 Marks] a) With the aid of a diagram explain how a crowbar circuit may be used to protect a D.C power supply in case of an over-voltage. [7 Marks) b) Explain the function of a snubber circuit. [4 Marks] c) The recovery current of a diode, as shown in figure 1, is IR = 20 A and the circuit inductance is L = 50 uH. The input voltage is Vs = 220V. If it is necessary to limit the peak transient voltage to 1.5 times the input voltage. Determine: i. The optimum value of current factor do. [2 Marks) ii. The optimum damping factor 0o. [2 marks] iii. The snubber capacitace C. [5 Marks iv. The snubber resistance R. (5Marks) DV Figure 1