GATE EE 2023 Set 1 — Question 23
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Power Electronics → DC-DC Converters
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Question
The chopper circuit shown in figure (i) feeds power to a DC constant current source. The switching frequency of the chopper is . All the components can be assumed to be ideal. The gate signals of switches and are shown in figure (ii). Average voltage across the current source is
Correct answer
(B) 6 V
Solution
1.Switching period: .
2.Direction of the load current: the A source draws current out of the midpoint of the leg and returns it to the bottom rail. So the current must always enter the midpoint, either from the V rail through , or from the bottom rail through (anode at the bottom rail, cathode at the midpoint). can conduct only from the midpoint down to the bottom rail, which is the opposite direction, so it never carries this current.
3.Output voltage over one period, from figure (ii):
- : is ON and carries the 5 A, so V.
- : is OFF. The current freewheels through , so V. This holds whether or not is gated (it is gated during –), because cannot carry current in this direction; conducts throughout.
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