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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. 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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Presentation Transcript
slide1
Chapter 8

Switch-Mode DC-AC Inverters

  • converters for ac motor drives and uninterruptible power supplies

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide2
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

slide3
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

slide4
Switch-Mode DC-AC Inverter
  • Four quadrants of operation

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide5
Full-Bridge DC-DC Converter

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide6
Half-bridge DC-AC Inverter
  • Half-bridge inverter
  • (One leg of full bridge converter)

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide7
Square-Wave Mode of Operation
  • Harmonics are of the fundamental frequency

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide8
Effect of Blanking Time
  • Results in nonlinearity

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide9
Effect of Blanking Time
  • Effect on the output voltage

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide10
Synthesis of a Sinusoidal Output by PWM

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide11
Synthesis of a Sinusoidal Output by PWM (2)

1

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide12
Half-Bridge DC-AC Inverter
  • Capacitors provide the mid-point

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide13
Full-Bridge DC-AC Inverter

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide14
Full-Bridge DC-AC Inverter

Bipolar Voltage switching

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide15
Full-Bridge DC-AC Inverter

Unipolar Voltage Switching

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide16
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

slide17
Sinusoidal Synthesis by Voltage Shift

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide18
Programmed Harmonic Elimination
  • Angles based on the desired output
  • IC circuit or microcontroller required

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

slide19
Summary of DC-AC Inverters

PWM

square-wave

Chapter 8 Switch-Mode DC-

Sinusoidal AC Inverters

ad