GATE EE 2014 Set 2 — Question 34
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Question
A step-up chopper is used to feed a load at from a source. The inductor current is continuous. If the ‘off’ time of the switch is , the switching frequency of the chopper in kHz is ____________.
Correct answer
31 to 31.5
Solution
For a step-up (boost) chopper, the relationship between output voltage () and source voltage () is:where is the duty cycle.
Therefore, .
1.Calculate the duty cycle ():
2.Relate duty cycle to off-time ():
Therefore, .
3.Calculate the time period ():
4.Calculate the switching frequency ():
The switching frequency is .Continue learning with Success Tracker
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