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
The circuit shown is a Villard voltage doubler. The input voltage is , which has a peak value V.
In a voltage doubler, the output voltage across the load resistor is approximately if the time constant is significantly larger than the period of the input signal.
Given: .
The period s.
The time constant s.
Since , the capacitors maintain a nearly constant voltage. The steady-state output voltage is approximately V.
Therefore, the average voltage across is nearest to 200 V.
In a voltage doubler, the output voltage across the load resistor is approximately if the time constant is significantly larger than the period of the input signal.
Given: .
The period s.
The time constant s.
Since , the capacitors maintain a nearly constant voltage. The steady-state output voltage is approximately V.
Therefore, the average voltage across is nearest to 200 V.
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