Find the expression for output voltage for a step-up chopper, assume linear variation of load current and δ as the duty cycle.

Find the output voltage for a step-up chopper when it is operated at a duty cycle of 50 % and Vs = 240 V.

If a step up chopper’s switch is always kept off then (ideally)

For a step-down chopper, find the rms value of output voltage. Let δ be the duty cycle and Vs be the input voltage.

A step-up chopper has input voltage of 220 V and output voltage of 660 V. If the conducting time of the IGBT based chopper is 100 μs, compute Toff width of the output voltage pulse.

For a step-up chopper, when the duty cycle is increased the average value of the output voltage

For a step-down chopper, when the duty cycle is increased the average value of the output voltage

The expression for a step-up/step-down chopper with α as the duty cycle and Vs as the dc input voltage is

For a step-up/step-down chopper, if the duty cycle > 0.5 then

A step down chopper has Vs = 230 V and R = 10 Ω. For a duty cycle of 0.4, the power taken by the chopper is 2097 Watts. Find the chopper efficiency. Take the voltage drop across the chopper switch as 2 V.