Power Electronics Devices, Circuits, and Applications 4th. Edition by Muhammad H. Rashid | 9780273785149 | 0273785141 | Holooly

Power Electronics Devices, Circuits, and Applications [EXP-36466]

145 SOLVED PROBLEMS

Question: 5.10

A buck converter is shown in Figure 5.40. The input voltage is Vs = 110 V, the average load voltage is Va = 60 V, and the average load current is Ia = 20 A. The chopping frequency is f = 20 kHz. The peak-to-peak ripples are 2.5% for load voltage, 5% for load current, and 10% for filter Le current.

Verified Answer:

V_s = 110 V, V_a = 60 V, I_a = 20 A

...

Question: 7.1

Analysis of the Basic Resonant Inverter The series resonant inverter in Figure 7.2 has L1 = L2 = L = 50 H, C = 6 F, and R = 2 . The dc input voltage is Vs = 220 V and the frequency of output voltage is fo = 7 kHz. The turnoff time of transistors is toff = 10 µs. Determine (a) the available

Verified Answer:

V_s = 220 V, C = 6 \mu F, L = 50 \mu H, ...

Question: 7.5

Analysis of the Full-Bridge Resonant Inverter with Bidirectional Switches The full-bridge resonant inverter in Figure 7.9a is operated at a frequency, fo = 3.5 kHz. If C = 6 μF, L = 50 μH, R = 2 Ω, and Vs = 220 V, determine (a) the peak supply current Ip, (b) the average device current IA, (c) the

Verified Answer:

V_s=220 V , C = 6 \mu F, L=50 \mu H, R =2...

Question: 7.2

Analysis of the Half-Bridge Resonant Inverter The half-bridge resonant inverter in Figure 7.3 is operated at an output frequency, fo = 7 kHz. If C1 = C2 = C = 3 F, L1 = L2 = L = 50 H, R = 2 , and Vs = 220 V, determine (a) the peak supply current Ips, (b) the average transistor current IA,

Verified Answer:

V_s = 220 V, C = 3 \mu F, L = 50 \mu H, R =...

Question: 7.4

Analysis of the Half-Bridge Resonant Inverter with Bidirectional Switches The half-bridge resonant inverter in Figure 7.8a is operated at a frequency of fo = 3.5 kHz. If C1 = C2 = C = 3 µF, L1 = L2 = L = 50 µH, R = 2 Ω, and Vs = 220 V, determine (a) the peak supply current Ip, (b) the average

Verified Answer:

V_s = 220 V, C_e = C_1 + C_2 = 6 μF, L=50...

Question: 17.2

Calculating the Parameters of the Thermal Equivalent Circuit A device in a TO-220 package is mounted with a 0.33-mm thick insulating foil on a small aluminum heat sink. This is shown in Figure 17.15a. The thermal resistance of the heat sink is Rth_KK = 25 K/W and its mass is msk = 2 g. The surface

Verified Answer:

Because the heat sink is small and compact, there ...

Question: 13.6

Design of a Transformer An ac–dc converter steps down the voltage through a transformer and supplies the load through a bridge rectifier, as shown in Figure 13.20a. Design a 60-Hz power transformer of the specifications: primary voltage V1 = 120 V, 60-Hz (square-wave), secondary voltage output

Verified Answer:

K_t = 4.44

for square wave, and [la...

Question: 13.7

Designing a Dc Inductor Design a dc inductor of L = 450 µH. The dc current is IL = 7.2 A with a ripple of ΔI = 1 A. Assume window factor Ku = 0.4. Use power core with a graded air gap.

Verified Answer:

The peak inductor current

I_m = I_L + ΔI = ...

Question: 14.2

Determining the Effects of Gear Ratio on the Effective Motor Torque and Inertia The parameters of the gearbox shown in Figure 14.7 are B1 = 0.025 Nm/rad/s, ω1 = 210 rad/s, Bm = 0.045 kg-m^2, Jm = 0.32 kg–m^2, T2 = 20 Nm, and ω2 = 21 rad/s. Determine (a) the gear ratio GR = N2/N1, (b) the effective

Verified Answer:

B_1 = 0.025 Nm/rad/s, ω_1 = 210 rad/s, B...

Question: 16.3

Determining the Effects of Practical Model Parameters on Output Voltage and the Output Power of PV Cells The reverse saturation current of a PV cell operating at 30°C is 10 nA. The solar current at 30°C is 1.2 A. Calculate the output voltage vL and output power PL of the PV cell when the load draws

Verified Answer:

I_C = 1.2 A, I_S = 10 nA, i_L = 0.6 A, R_s ...

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