Question

A step-down chopper has input voltage 40 V and output voltage 20 V. Calculate the value of the duty cycle.

(a) 0.5

(b) 0.2

(c) 0.3

(d) 0.4

I had been asked this question in an online interview.

My query is from Solid-State Devices topic in section Introduction to Solid-State Devices of Electric Drives

Answer 1

Correct option is (a) 0.5

Easy explanation: The output voltage of the step-down chopper is Vo = Vin×(D). The value of the duty cycle is less than one which makes the Vo < Vin. The step-down chopper is used to step down the voltage. The value of the duty cycle is 20÷40 = .5.