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 Power flow 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 Power flow 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

Full-Bridge DC-DC Converter Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Half-bridge DC-AC Inverter Half-bridge inverter (One leg of full bridge converter) 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) 1 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

Full-Bridge DC-AC Inverter Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Full-Bridge DC-AC Inverter Bipolar Voltage switching Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Full-Bridge DC-AC Inverter Unipolar Voltage Switching Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Full-Bridge DC-AC Inverter Unipolar Voltage Switching 1 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 IC circuit or microcontroller required Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

Summary of DC-AC Inverters PWM square-wave Copyright © 2008 by Jose Bastos Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

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