GATE EE 2015 Set 2 — Question 18
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Analog & Digital Electronics → Diode Circuits → Filters & Ripple Factor
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Question
In the following circuit, the input voltage is . For , the average voltage across (in Volts) under steady-state is nearest to
Correct answer
(C) 200
Solution
Identify the circuit. The two diodes (both conducting upward, from the bottom line towards the top line) are in series on the left, the two capacitors are in series in the middle, and the source is connected between the diode junction and the capacitor junction. This is a full-wave (bridge-type) voltage doubler, with across the series pair of capacitors.How it charges. The peak input is V.
- When , the diode junction is above the capacitor junction, the upper diode conducts, and the upper capacitor charges to about .
- When , the lower diode conducts and the lower capacitor charges to about .
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