b) As shown in Figure 1(a), a DC source, Vs=(250+0.01*XY) V supplies power to a resistive load RL=100 through an ideal switch S. The average voltage across the load RL is (50+0.01*XY) V and the switch S is operated at 200 kHz. Vs Ľ Figure 1 (i) Find the power delivered to the load (PL), the total power supplied by the source (Ps) and efficiency of the power supply. (ii) Find the duty cycle of the switch S and sketch the load voltage. (iii) If the same power is supplied to the same load through a rheostat Rr, as shown in Figure 1(b). Find the resistance of R, and the efficiency of the power supply. Comment on the benefits of using a power electronics switch for power supply control. S (a) x = 1, y = 7 R₁ Vs Rr (b) RL

b) As shown in Figure 1(a), a DC source, Vs=(250+0.01XY) V supplies power to a resistive load RL=100 through an ideal switch S. The average voltage across the load RL is (50+0.01XY) V and the switch S is operated at 200 kHz. Vs Ľ Figure 1 (i) Find the power delivered to the load (PL), the total power supplied by the source (Ps) and efficiency of the power supply. (ii) Find the duty cycle of the switch S and sketch the load voltage. (iii) If the same power is supplied to the same load through a rheostat Rr, as shown in Figure 1(b). Find the resistance of R, and the efficiency of the power supply. Comment on the benefits of using a power electronics switch for power supply control. S (a) x = 1, y = 7 R₁ Vs Rr (b) RL

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.8MCQ: An ac resistance is higher than a dc resistance. True False

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Question

b) As shown in Figure 1(a), a DC source, Vs=(250+0.01*XY) V supplies power
to a resistive load RL=100 through an ideal switch S. The average voltage
across the load RL is (50+0.01*XY) V and the switch S is operated at 200
kHz.
Vs
T
Figure 1
(i) Find the power delivered to the load (PL), the total power supplied by
the source (Ps) and efficiency of the power supply.
(ii) Find the duty cycle of the switch S and sketch the load voltage.
(iii) If the same power is supplied to the same load through a rheostat Rr,
as shown in Figure 1(b). Find the resistance of R, and the efficiency
of the power supply. Comment on the benefits of using a power
electronics switch for power supply control.
(a)
x = 1, y = 7
RL
Vs
Rr
(b)
R₁

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