GATE EE 2025 Set 1 — Question 34
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Power Electronics → DC-DC Converters → Duty Ratio & Efficiency
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Question
In the circuit with ideal devices, the power MOSFET is operated with a duty cycle of 0.4 in a switching cycle with A and V. The power delivered by the current source, in W, is ____________ (round off to the nearest integer).
Correct answer
90 to 90
Solution
In a switching cycle, the power delivered by the current source is given by , where is the average voltage across the current source.
When the MOSFET is ON (for time ), the voltage across it (and thus the current source) is V (ideal device).
When the MOSFET is OFF (for time ), the current flows through the diode to the voltage source . The voltage across the current source is then V.
The average voltage is V.
The power delivered is W.
When the MOSFET is ON (for time ), the voltage across it (and thus the current source) is V (ideal device).
When the MOSFET is OFF (for time ), the current flows through the diode to the voltage source . The voltage across the current source is then V.
The average voltage is V.
The power delivered is W.
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