8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters...
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Transcript of 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters...
![Page 1: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/1.jpg)
8-1
Chapter 8
Switch-Mode DC-AC Inverters
• converters for ac motor drives and uninterruptible power supplies
![Page 2: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/2.jpg)
8-2
Switch-Mode DC-AC Inverter
• Block diagram of a motor drive where the power flow is unidirectional
![Page 3: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/3.jpg)
8-3
Switch-Mode DC-AC Inverter
• Block diagram of a motor drive where the power flow can be bi-directional
![Page 4: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/4.jpg)
8-4
Switch-Mode DC-AC Inverter
• Four quadrants of operation
![Page 5: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/5.jpg)
8-5
One Leg of a Switch-Mode DC-AC Inverter
• The mid-point shown is fictitious
![Page 6: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/6.jpg)
8-6
Synthesis of a Sinusoidal Output by PWM
![Page 7: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/7.jpg)
8-7
Details of a Switching Time Period
• Control voltage can be assumed constant during a switching time-period
![Page 8: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/8.jpg)
8-8
Harmonics in the DC-AC Inverter Output Voltage
• Harmonics appear around the carrier frequency and its multiples
![Page 9: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/9.jpg)
8-9
Harmonics due to Over-modulation
• These are harmonics of the fundamental frequency
![Page 10: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/10.jpg)
8-10
Output voltage Fundamental as a Function of the Modulation Index
• Shows the linear and the over-modulation regions; square-wave operation in the limit
![Page 11: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/11.jpg)
8-11
Square-Wave Mode of Operation
• Harmonics are of the fundamental frequency
![Page 12: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/12.jpg)
8-12
Half-Bridge Inverter
• Capacitors provide the mid-point
![Page 13: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/13.jpg)
8-13
Single-Phase Full-Bridge DC-AC Inverter
• Consists of two inverter legs
![Page 14: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/14.jpg)
8-14
PWM to Synthesize Sinusoidal Output
• The dotted curve is the desired output; also the fundamental frequency
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8-15
Analysis assuming Fictitious Filters
• Small fictitious filters eliminate the switching-frequency related ripple
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8-16
DC-Side Current
• Bi-Polar Voltage switching
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8-17
Output Waveforms: Uni-polar Voltage
Switching
• Harmonic components around the switching frequency are absent
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8-18
DC-Side Current in a Single-Phase Inverter
• Uni-polar voltage switching
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8-19
Sinusoidal Synthesis by Voltage Shift
• Phase shift allows voltage cancellation to synthesize a 1-Phase sinusoidal output
![Page 20: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/20.jpg)
8-20
Single-Phase Inverter
• Analysis at the fundamental frequency
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8-21
Square-Wave and PWM Operation
• PWM results in much smaller ripple current
![Page 22: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/22.jpg)
8-22
Push-Pull Inverter
• Low Voltage to higher output using square-wave operation
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8-23
Three-Phase Inverter
• Three inverter legs; capacitor mid-point is fictitious
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8-24
Three-Phase PWM
Waveforms
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8-25
Three-Phase Inverter Harmonics
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8-26
Three-Phase Inverter Output
• Linear and over-modulation ranges
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8-27
Three-Phase Inverter: Square-Wave Mode
• Harmonics are of the fundamental frequency
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8-28
Three-Phase Inverter: Fundamental Frequency
• Analysis at the fundamental frequency can be done using phasors
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8-29
Square-Wave and PWM Operation
• PWM results in much smaller ripple current
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8-30
DC-Side Current in a Three-Phase Inverter
• The current consists of a dc component and the switching-frequency related harmonics
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8-31
Square-Wave Operation
• devices conducting are indicated
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8-32
PWM Operation
• devices conducting are indicated
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8-33
Short-Circuit States in PWM Operation
• top group or the bottom group results in short circuiting three terminals
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8-34
Effect of Blanking Time
• Results in nonlinearity
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8-35
Effect of Blanking Time
• Voltage jump when the current reverses direction
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8-36
Effect of Blanking Time
• Effect on the output voltage
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8-37
Programmed Harmonic Elimination
• Angles based on the desired output
![Page 38: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/38.jpg)
8-38
Tolerance-Band Current Control
• Results in a variable frequency operation
![Page 39: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/39.jpg)
8-39
Fixed-Frequency Operation
• Better control is possible using dq analysis
![Page 40: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/40.jpg)
8-40
Transition from Inverter to Rectifier Mode
• Can analyze based on the fundamental-frequency components
![Page 41: 8-1 Copyright © 2003 by John Wiley & Sons, Inc. Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for.](https://reader033.fdocuments.net/reader033/viewer/2022061512/56649d9c5503460f94a85a14/html5/thumbnails/41.jpg)
8-41
Summary of DC-AC Inverters
• Functional representation in a block-diagram form