List of Top Power Electronics and Drives Questions on Phase Controlled Rectifiers

The above circuit is operated at 120 V – 60 Hz supply and the load resistance R = 20 Ω, L = 40 mH, delay angles are α₁ = 60°, α₂ = 120°. The value of :

(A) Peak circulating current = 11.250 A
(B) Peak circulating current = 6.250 A
(C) Peak current of converter 1 = 8.485 A
(D) Peak current of converter 1 = 19.735 A

Choose the most appropriate answer from the options given below :

For the circuit given, phase voltage is V_m sin ω_mt, where V_m is the peak phase voltage. The value of maximum average output voltage that occurs at a delay angle α = 0 is given by :

In one quadrant converters such as half controlled bridge circuit or single phase circuit with fly wheel diodes for DC moter.

In a two quadrant single phase SCR Drive armature current becomes continuous when :

In a fully controlled three phase bridge without fly wheel operation the displacement factor and power factor is :

The reading of an ac ammeter connected to a half controlled rectifier with firing angle α = 0 will be :

A single-phase full-controlled thyristor converter bridge is used for regenerative braking of a separately excited DC motor with the following specifications:

Assume that the motor is running at 600 rpm and the armature terminals of the motor are suitably reversed for regenerative braking. If the armature current of the motor is to be maintained at the rated value, the triggering angle of the converter bridge in degrees should be ______________(rounded off to 2 decimal places).

A single-phase half-controlled bridge converter supplies an inductive load with ripple free load current. The triggering angle of the converter is $60^\circ$. The ratio of the rms value of the fundamental component of the input current to the rms value of the total input current of the bridge is ______________(rounded off to 3 decimal places).