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Chapter 8 Switch-Mode DC-AC Inverters PowerPoint PPT Presentation


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Chapter 8 Switch-Mode DC-AC Inverters. converters for ac motor drives and uninterruptible power supplies. Switch-Mode DC-AC Inverter. Power flow. Block diagram of a motor drive where the power flow is unidirectional. Switch-Mode DC-AC Inverter. Power flow.

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Chapter 8 Switch-Mode DC-AC Inverters

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Chapter 8

Switch-Mode DC-AC Inverters

  • converters for ac motor drives and uninterruptible power supplies

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

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

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Switch-Mode DC-AC Inverter

  • Four quadrants of operation

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Full-Bridge DC-DC Converter

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Half-bridge DC-AC Inverter

  • Half-bridge inverter

  • (One leg of full bridge converter)

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Square-Wave Mode of Operation

  • Harmonics are of the fundamental frequency

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Effect of Blanking Time

  • Results in nonlinearity

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Effect of Blanking Time

  • Effect on the output voltage

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Synthesis of a Sinusoidal Output by PWM

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Synthesis of a Sinusoidal Output by PWM (2)

1

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Half-Bridge DC-AC Inverter

  • Capacitors provide the mid-point

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Full-Bridge DC-AC Inverter

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Full-Bridge DC-AC Inverter

Bipolar Voltage switching

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Full-Bridge DC-AC Inverter

Unipolar Voltage Switching

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

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Sinusoidal Synthesis by Voltage Shift

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Programmed Harmonic Elimination

  • Angles based on the desired output

  • IC circuit or microcontroller required

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


Summary of DC-AC Inverters

PWM

square-wave

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters


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