3.7 A single-phase full-bridge inverter feeds power at 50 Hz to RLC load with R = 5 2, L= 0.3 H and C = 50 µF. The DC input voltage is 220 V DC. (a) Find an expression for load current up to the fifth harmonic. (b) Calculate the power absorbed by the load and the fundamental power. (c) Calculate the RMS and peak currents of each thyristor. 3.8 Explain the working of a three-phase bridge inverter with an appropriate circuit diagram. Draw phase and line voltage waveforms on the assumption that each thyristor conducts for 180° and the resistive load is star connected. 3.9 Repeat Problem 3.7 in case each thyristor conducts for 120°. 3.10 Repeat Problem 3.7 in case the load is delta connected. 3.11 A star-connected load of 28 2 per phase is fed from 440-V DC source through a three-phase bridge inverter. For both (a) 180° mode and (b) 120° mode, determine: (i) RMS value of load current. (ii) RMS value of thyristor current. (iii) Load power 3.12 What is the need for controlling the voltage at the output terminals of an inverter? 3.13 What is PWM? List the various PWM techniques. 3.14 Explain various methods of harmonic reductions in detail?

3.7 A single-phase full-bridge inverter feeds power at 50 Hz to RLC load with R = 5 2, L= 0.3 H and C = 50 µF. The DC input voltage is 220 V DC. (a) Find an expression for load current up to the fifth harmonic. (b) Calculate the power absorbed by the load and the fundamental power. (c) Calculate the RMS and peak currents of each thyristor. 3.8 Explain the working of a three-phase bridge inverter with an appropriate circuit diagram. Draw phase and line voltage waveforms on the assumption that each thyristor conducts for 180° and the resistive load is star connected. 3.9 Repeat Problem 3.7 in case each thyristor conducts for 120°. 3.10 Repeat Problem 3.7 in case the load is delta connected. 3.11 A star-connected load of 28 2 per phase is fed from 440-V DC source through a three-phase bridge inverter. For both (a) 180° mode and (b) 120° mode, determine: (i) RMS value of load current. (ii) RMS value of thyristor current. (iii) Load power 3.12 What is the need for controlling the voltage at the output terminals of an inverter? 3.13 What is PWM? List the various PWM techniques. 3.14 Explain various methods of harmonic reductions in detail?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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