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Introduction

Introduction. Conversion of available DC source into AC of variable frequency is accomplished by force commutated inverters. The frequency of AC at output can be varied by controlling the conduction period of thyristors.

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Introduction

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  1. Introduction • Conversion of available DC source into AC of variable frequency is accomplished by force commutated inverters. • The frequency of AC at output can be varied by controlling the conduction period of thyristors. • Output voltage of inverter has periodic waveform that is not sinusoidal but can be made to closely approximate this desired waveform. • Inverters are used in industrial applications, including speed control of induction and synchronous motor, aircraft power supplies, uninterruptible power supplies (UPS), and high-voltage DC transmision.

  2. Half-Bridge Inverter

  3. Square-wave output Step-wave output

  4. Voltage Source Inverter (VSI)

  5. Half-Bridge VSI

  6. Example 10.1

  7. Full-Bridge VSI

  8. Square-Wave output With Inductive RL load

  9. Step-Wave output

  10. Inverter Voltage Control Techniques 1- Control of DC input voltage supplied to the inverter 2- Control of AC output voltage of the inverter 3- Control of the voltage within the inverter

  11. Pulse-Width Modulation

  12. (A) Single Pulse-Width Modulation

  13. (B) Multiple Pulse-Width Modulation Variable duty cycle with m= 5 • m= 2 • m= 3

  14. (C) Sinusoidal Pulse-Width Modulation

  15. PWM Inverters Single-phase Full-Bridge Inverters

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