GATE EE 2014 Set 2 — Question 33
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Analog & Digital Electronics → Diode Circuits → Rectifiers (HW, FW, Bridge)
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Question
The sinusoidal ac source in the figure has an rms value of . Considering all possible values of , the minimum value of in to avoid burnout of the Zener diode is _________.
Correct answer
299 to 301
Solution
To avoid burnout, the Zener current must not exceed its maximum rated current .
1.Determine Zener parameters:
, .2.Determine peak input voltage:
The source is . The peak voltage after the bridge rectifier (ignoring diode drops as they are usually negligible in such problems unless specified) is:3.Identify worst-case scenario:
The Zener current is maximum when the load is disconnected () and the input voltage is at its peak.4.Calculate minimum :
Thus, the minimum value of is .Continue learning with Success Tracker
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