Question

For the step-down chopper shown in the figure below, dc source voltage = 230 V. Find the power delivered to the load of R = 10 Ω. Duty cycle = 40 %. Take voltage drop at the switch to be 2 V.

(a) 1 kW

(b) 2.08 kW

(c) 569 W

(d) 207 W

This question was posed to me in an international level competition.

Enquiry is from Choppers-4 topic in portion Choppers of Power Electronics

Answer 1

Correct option is (b) 2.08 kW

To explain: Vo (rms) = √0.4 x (230 – 2) = 144.2 V

P = 144.2^2/10 = 2079.3 W = 2.08 kW.