Power Electroni...

A step up chopper is required to deliver a load voltage of 660 V and 220 V dc source. If the non-conduction time of SCR is 100 μs, the required pulse-width will be 

A single - quadrant chopper is operating with the following specification: Ideal battery of 240 V; on time (Ton) = 1.5 ms, OFF time = 2 ms. The Form factor factor will be –

A step-down chopper has input voltage 200 V and o/p voltage 140 V. If the conduction time of thyristor chopper is 70 μ sec. Now if the frequency operation is increased by 25% keeping conduction time of thyristor constant than find the average value of new output voltage.

A buck converter is driven by a constant input voltage 30 V. The switching frequency is 10 kHz, the L and C of the converter are 1 mH and 10 μF. Calculate the output ripple voltage in V, when duty cycle of gate signal of the transistor is 0.5. The converter is operating in continuous mode.

For a step-down converter dc source voltage is 230 V, load resistance = 10 ohms, voltage drop across the switch is 2 V when it is on. For a duty cycle of 0.4, calculate chopper efficiency.

A boost converter has an L = 10 μH, output voltage = 60 V and switching frequency, f_s = 100 kHz. Calculate the value for minimum load current (in A) such that the converter is always operated in continuous inductor conduction mode for all conditions.

A boost converter is required to have an output voltage of 8 V and supply a load current of 1 A. The input voltage is varying from 2.7 to 4.2 V. A control circuit adjusts the duty ratio to keep the output voltage constant. The switching frequency is 200 kHz. Determine the minimum value for the inductor such that the variation in inductor current is no more than 40 percent of the average inductor current for all operating conditions.

A class – A chopper circuit is supplied DC source voltage 100 V. The chopper supplies power to a series R-L load with R = 0.5 Ω and L = 1 mH. The chopper switch is ON for 1 ms in an overall period of 3 ms. The maximum value of load current is ______ (in A). Assume continuous current operation of the chopper.