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A DC chopper feeds an RLE load. If the value of E is increased by 20%, the current ripple ________

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A DC chopper feeds an RLE load. If the value of E is increased by 20%, the current ripple ________

(a) increases by 20%

(b) decreases by 20%

(c) increases only 20%

(d) remains the same

This question was posed to me by my school teacher while I was bunking the class.

My question comes from Modified Speed Torque Characteristics of DC Shunt Motors topic in section Characteristics of DC & AC Motors of Electric Drives

1 Answer

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Correct choice is (d) remains the same

The explanation is: For a buck converter current ripple doesn’t depend on the value of E. ΔIL = Vdc×D×(1-D)×T÷L. The expression is independent of the value of E.

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