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**Chapter 5 Line-Frequency Diode Rectifiers**

Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Diode Rectifier Block Diagram**

Uncontrolled utility interface (ac to dc) Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Chapter 5 Line-Frequency Diode Rectifiers**

A Simple Circuit Resistive load Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**A Simple Circuit (R-L Load)**

Current continues to flows for a while even after the input voltage has gone negative Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**A Simple Circuit (Load has a dc back-emf)**

Current begins to flow when the input voltage exceeds the dc back-emf Current continues to flows for a while even after the input voltage has gone below the dc back-emf Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Single-Phase Diode Rectifier Bridge**

Large capacitor at the dc output for filtering and energy storage Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Diode-Rectifier Bridge Analysis**

Two simple (idealized) cases to begin with Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Redrawing Diode-Rectifier Bridge**

Two groups, each with two diodes Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Chapter 5 Line-Frequency Diode Rectifiers**

Waveforms with a purely resistive load and a purely dc current at the output In both cases, the dc-side voltage waveform is the same Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Diode-Rectifier Bridge Input Current**

Idealized case with a purely dc output current Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Diode-Rectifier Bridge Analysis with AC-Side Inductance**

Output current is assumed to be purely dc Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Understanding Current Commutation**

Assuming inductance in this circuit to be zero Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Understanding Current Commutation (cont.)**

Inductance in this circuit is included Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Current Commutation Waveforms**

Shows the volt-seconds needed to commutate current Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Current Commutation in Full-Bridge Rectifier**

Shows the necessary volt-seconds Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Understanding Current Commutation**

Note the current loops for analysis Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Chapter 5 Line-Frequency Diode Rectifiers**

Rectifier with a dc-side voltage Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**DC-Side Voltage and Current Relationship**

Zero current corresponds to dc voltage equal to the peak of the input ac voltage Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Effect of DC-Side Current on THD, PF and DPF**

Very high THD at low current values Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Crest Factor versus the Current Loading**

The Crest Factor is very high at low values of current Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Diode-Rectifier with a Capacitor Filter**

Power electronics load is represented by an equivalent load resistance Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Diode Rectifier Bridge**

Equivalent circuit for analysis on one-half cycle basis Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Diode-Bridge Rectifier: Waveforms**

Analysis using MATLAB Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Diode-Bridge Rectifier: Waveforms**

Analysis using PSpice Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Input Line-Current Distortion**

Analysis using PSpice Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Line-Voltage Distortion**

PCC is the point of common coupling Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Line-Voltage Distortion**

Distortion in voltage supplied to other loads Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Voltage Doubler Rectifier**

In 115-V position, one capacitor at-a-time is charged from the input. Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**A Three-Phase, Four-Wire System**

A common neutral wire is assumed Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Current in A Three-Phase, Four-Wire System**

The current in the neutral wire can be very high Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Three-Phase, Full-Bridge Rectifier**

Commonly used Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Three-Phase, Full-Bridge Rectifier: Redrawn**

Two groups with three diodes each Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Three-Phase, Full-Bridge Rectifier Waveforms**

Output current is assumed to be dc Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Three-Phase, Full-Bridge Rectifier: Input Line-Current**

Assuming output current to be purely dc and zero ac-side inductance Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Three-Phase, Full-Bridge Rectifier**

Including the ac-side inductance Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**3-Phase Rectifier: Current Commutation**

output current is assumed to be purely dc Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Rectifier with a Large Filter Capacitor**

Output voltage is assumed to be purely dc Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Three-Phase, Full-Bridge Rectifier**

THD, PF and DPF as functions of load current Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Crest Factor versus the Current Loading**

The Crest Factor is very high at low values of current Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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**Three-Phase Rectifier Waveforms**

PSpice-based analysis Copyright © 2003 by John Wiley & Sons, Inc. Chapter 5 Line-Frequency Diode Rectifiers

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