Switch-Mode DC-AC Inverters

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Presentation transcript:

Switch-Mode DC-AC Inverters Chapter 8 Switch-Mode DC-AC Inverters converters for ac motor drives and uninterruptible power supplies Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Switch-Mode DC-AC Inverter Block diagram of a motor drive where the power flow is unidirectional Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Switch-Mode DC-AC Inverter Block diagram of a motor drive where the power flow can be bi-directional Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Switch-Mode DC-AC Inverter Four quadrants of operation Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

One Leg of a Switch-Mode DC-AC Inverter full bridge converter (fig shows one leg) The mid-point shown is fictitious Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Square-Wave Mode of Operation Harmonics are of the fundamental frequency Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Effect of Blanking Time Results in nonlinearity Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Effect of Blanking Time Effect on the output voltage Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Synthesis of a Sinusoidal Output by PWM Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Synthesis of a Sinusoidal Output by PWM (2) Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Half-Bridge DC-AC Inverter Capacitors provide the mid-point Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Single-Phase Full-Bridge DC-AC Inverter Consists of two inverter legs Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

PWM to Synthesize Sinusoidal Output The dotted curve is the desired output; also the fundamental frequency Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Bi-Polar Voltage switching Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Uni-polar Voltage Switching Harmonic components around the switching frequency are absent Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Sinusoidal Synthesis by Voltage Shift Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Programmed Harmonic Elimination Angles based on the desired output Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Summary of DC-AC Inverters PWM square-wave Functional representation in a block-diagram form Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

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