This article outlines the definition, working principle and derivation & formula for average output voltage of a Step-down Chopper.
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Solved D)- - For the following step-down chopper (DC-DC)
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Step Down Chopper with RLE Load Working Principle - EEEGUIDE
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What do you mean by Choppers (in power electronics)? - Quora
Simulate a step-down chopper circuit using LTSpice