6-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Chapter 6 Thyristor Converters Controlled conversion of ac into dc

6-2 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converters Two-quadrant conversion

6-3 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Primitive circuits with thyristors

6-4 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Triggering ICs available

6-5 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Full-Bridge Thyristor Converters Single-phase and three-phase

6-6 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Single-Phase Thyristor Converters Two groups with two thyristor each

6-7 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters 1-Phase Thyristor Converter Waveforms Assuming zero ac-side inductance

6-8 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Average DC Output Voltage Assuming zero ac-side inductance

6-9 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Input Line-Current Waveforms Harmonics, power and reactive power

6-10 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters 1-Phase Thyristor Converter Finite ac-side inductance; constant dc output current

6-11 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converter Waveforms Finite ac-side inductance

6-12 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converter: Discontinuous Mode This mode can occur in a dc-drive at light loads

6-13 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converter Waveforms PSpice-based simulation

6-14 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converter Waveforms: Discontinuous Conduction Mode PSpice-based simulation

6-15 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters DC Voltage versus Load Current Various values of delay angle

6-16 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converters: Inverter Mode Assuming the ac-side inductance to be zero

6-17 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converters: Inverter Mode Family of curves at various values of delay angle

6-18 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converters: Inverter Mode Importance of extinction angle in inverter mode

6-19 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converters: Inverter Mode Waveforms at start-up

6-20 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters 3-Phase Thyristor Converters Two groups of three thyristors each

6-21 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters 3-Phase Thyristor Converter Waveforms Zero ac-side inductance; purely dc current

6-22 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters DC-side voltage waveforms assuming zero ac- side inductance

6-23 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Input Line-Current Waveform Zero ac-side inductance

6-24 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Input line-current waveforms assuming zero ac- side inductance

6-25 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Three-Phase Thyristor Converter AC-side inductance is included

6-26 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Current Commutation Waveforms Constant dc-side current

6-27 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Input Line-Current Waveform Finite ac-side inductance

6-28 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Input Line-Current Harmonics Finite ac-side inductance

6-29 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Input Line-Current Harmonics Typical and idealized

6-30 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Three-Phase Thyristor Converter Realistic load

6-31 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converter Waveforms Realistic load; continuous-conduction mode

6-32 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converter Waveforms Realistic load; discontinuous-conduction mode

6-33 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Inverter Constant dc current

6-34 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Inverter Waveforms Finite ac-side inductance

6-35 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Inverter Family of curves at various values of delay angle

6-36 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Inverter Operation Importance of extinction angle

6-37 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converters: Voltage Notching Importance of external ac-side inductance

6-38 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Limits on Notching and Distortion Guidelines

6-39 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 6 Thyristor Converters Thyristor Converter Representation Functional block diagram