UEEC010 - Uncontrolled rectifiers.pptx

UEEC010 - Uncontrolled rectifiers.pptx

• 1.
  UEEC010 – PowerElectronics Uncontrolled Rectifiers Poornima D, Assistant Professor/EEE, Sri Ramakrishna Institute of Technology, Coimbatore 1
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  Rectifiers Rectifiers –converts acinput voltage to dc output voltage Uncontrolled Rectifiers: – Uses Power Diodes – called so because the on/off of the diode cannot be controlled – Average output voltage is a fixed voltage, cannot be controlled 2
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  Power Diodes  PowerDiodes are such semiconductor devices used in rectifier circuitries to rectify higher value current.  This diode has a larger area of PN junction then other diodes, due to this ability is used to rectifier higher value current and voltage, like hundred amperes and thousand kilovolts. 3
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  Single Phase HalfWave Rectifier -Simplest type -Poor performance -For one cycle of supply voltage there is one half cycle of output- called single phase one pulse rectifier -Load can be R,RL or RL with freewheeling diode 4
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  Single Phase HalfWave Rectifier with R Load . 5
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  Single Phase HalfWave Rectifier RL Load 6
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  Single Phase HalfWave Rectifier RL Load with free wheeling diode 7
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  Single Phase HalfWave Rectifier RLE Load 8
• 9.
  Single Phase FullWave Rectifier • Utilises both halves of the input sinusoidal waveform to provide a unidirectional output • The output voltage is more consistent • Has a higher average output voltage • The input frequency is doubled by the process of rectification • Requires a smaller capacitance value smoothing capacitor • Applications in variable voltage power supplies and motor control. 9
• 10.
  Single Phase FullWave Rectifier with R Load 10
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  Single Phase FullWave Rectifier with RL Load 11
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  Single Phase FullWave Rectifier RLE Load (Continuous current) 12
• 13.
  Single Phase FullWave Rectifier RLE Load (Discontinuous current) 13
• 14.
  Three Phase HalfWave Rectifier R Load 14
• 15.
  Three Phase HalfWave Rectifier RL Load 15
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  Three Phase FullWave Rectifier R Load 16
• 17.
  Three Phase FullWave Rectifier RL Load 17