A single-phase full-wave ac voltage controller has a resistive load of R = 10 N and the input voltage is Vs = 120V (rms), 60 Hz. The delay angles of thyristors T1 and T2 are equal a, a2 = a = a/2. Determine (a) the rms output voltage Vo, (b) the input PF, (c) the average current of thyristors Ia and (d) the rms current of thyristors Ir.

The three-phase full-wave converter shown below is used to rectify the three phase (Y-connection) source signals. The six Thyristor are triggered in the sequence shown. Sketch for firing angle (a=90°) the output voltage (Vo), the phase current, the current for any two Thyristor in any one leg, and the load current (Ia). Then calculate (a) Thyristor average and r.m.s current. (b) Supply average and r.m.s current. (c) The normalized average output voltage. (d) The maximum output voltage. [Vdc = [1 - cos(60+ a)] Vml T If the line-to-neutral voltages are defined as 11 T, T T STA T. Load I sin od sin() ex-> Solve the question sin(with your own hands the corresponding line-to-line voltages are √31% sin (out + ) ---√(4)

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(b) A three-phase uncontrolled bridge rectifier is connected to an AC supply of 415V through a delta-star transformer as shown in the Figure. The load consists of large inductance to render a level load current of 60A at 300V. Assuming voltage drop across the power device to be 0.7V, compute the following: i) Rms value of secondary phase voltage and current; ii) Rms value of primary phase voltage and current3; iii) Transformer power rating in kVA and transformation ratio; iv) Device ratings. 本の。 本の 本の Load 本の。 本。 本の。 Figure

A DC chopper has a resistive load of R = 10 2 and an input voltage of Vs = 220 V. When the chopper switch remains in the ON state, its voltage drop is Vch = 2 V. If the duty cycle is 50%, determine its average output voltage Vo

A single-phase, 60 Hz(input) convertor, such as shown below, operates at a synchronous carrier frequency of 300 Hz, The DC Link voltage is 680 V, and the effective value of the fundamental AC voltage E34 is 430 V. Calculate; 1) The duty cycle D, and Ton when the AC voltage is 500V. 2) The duty cycle D, and Ton when the AC voltage is -30V. 3) Draw the waveform of the convertor output. 5 EL 4-quadrant switching converter EH 2 4 6 D Se

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A single-phase center-tapped transformer rectifier has an ac source of 240 V rms and 60 Hz. The overall transformer turns ratio is 3:1 (80 V between the extreme ends of the secondary and 40 V on each tap). The load is a resistance of 462 Ω. Determine (a) the average load current, (b) the rms load current, (c) the average source current, and (d) the rms source current. Sketch the current waveforms of the load and the source

The three-phase half-wave converter shown in Figure is operated from a three-phase Y-connected 220-V. 60-Hz supply and a freewheeling diode is connected across the load. The load current with an average value of I, is continuous and the ripple content is negligible. If the delay angle alpha = alpha / 3, calculate (A) the displacement factor. and (B) the input power factor. टे Lond

Q1. a) An SCR based AC power controller circuit is given in Figure 1. The circuit connects a 240V 50Hz AC source vi to a resistive load with resistance of 100. If the delay angle is a-15°, draw the waveforms of the load voltage Vo, and the voltage across SCR2. Calculate the power supplied to the load. + Vi Va + 2 SCR2 H₁₁ SCR₁ Figure 1 SCR based AC power control circuit Va + 2 io b) Figure 2 is a single phase 2-level voltage source converter (VSC) with a DC voltage Vd-200V. A PWM scheme, by comparing a reference value with a 10kHz triangle waveform, is used to control the switches S₁ and S2. The modulation index of the PWM is m=0.8. With the aid of graphs explain how pulse signals for the switches are generated, sketch the output voltage Vo, determine the duty cycle, and calculate the average output voltage. + Vo + Vo √ ₂ == Figure 2 A single phase VSC