Values ​​of Vg = 125 V, V0 = 75 V, f = 15 kHz, R = 10  are given for the buck converter. The switch, diode, coil and capacitor used are considered ideal. According to this: a) In order that the peak-to-peak value of the coil current ripple does not exceed 5% of the rated load current value the inductance (L) of the coil to be used and the average output voltage of the output voltage ripple. Calculate the capacity (C) of the capacitor that should be used to be 1% of the value.  b) This circuit must be used for continuous transmission (CCM) operation at 50% load. Find the minimum inductance value.

Q1. a) Figure Q1 is a single phase 2-level voltage source converter (VSC) with a total DC voltage V-1000V. A PWM scheme, by comparing a reference value with a 1kHz triangular waveform, is used to control the switches S₁ and S2, and output 340v at Vo. With the aid of graphs explain how pulse signals for the switches are generated, sketch the output voltage Vo, determine the duty cycle and the modulation index. Va + 2 it Va d + TS₁ V {1+5₂ = Figure Q1 A single phase VSC

For the buck-boost converter, determine the duty cycle, the switching frequency, and the inductor current ripple. The output voltage ripple is about 1%. vs 10 V, mH, C 0.5 micro.F, Vout=-20 V, R-IO Q

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)