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Controlled Rectifiers (Line Commutated AC to DC converters)

Controlled Rectifiers (Line Commutated AC to DC converters). 1. Type of input: Fixed voltage, fixed frequency ac power supply. Type of output: Variable dc output voltage Type of commutation: Natural / AC line commutation. 2. Different types of Line Commutated Converters.

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Controlled Rectifiers (Line Commutated AC to DC converters)

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  1. Controlled Rectifiers(Line Commutated AC to DC converters) 1

  2. Type of input: Fixed voltage, fixed frequency ac power supply. • Type of output: Variable dc output voltage • Type of commutation: Natural / AC line commutation 2

  3. Different types of Line Commutated Converters • AC to DC Converters (Phase controlled rectifiers) • AC to AC converters (AC voltage controllers) • AC to AC converters (Cyclo converters) at low output frequency. 3

  4. Differences Between Diode Rectifiers & Phase Controlled Rectifiers 4

  5. The diode rectifiers are referred to as uncontrolled rectifiers . • The diode rectifiers give a fixed dc output voltage . • Each diode conducts for one half cycle. • Diode conduction angle = 1800 or  radians. • We can not control the dc output voltage or the average dc load current in a diode rectifier circuit. 5

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  7. Applications ofPhase Controlled Rectifiers • DC motor control in steel mills, paper and textile mills employing dc motor drives. • AC fed traction system using dc traction motor. • Electro-chemical and electro-metallurgical processes. • Magnet power supplies. • Portable hand tool drives. 7

  8. Classification ofPhase Controlled Rectifiers • Single Phase Controlled Rectifiers. • Three Phase Controlled Rectifiers. 8

  9. Different types of Single Phase Controlled Rectifiers. • Half wave controlled rectifiers. • Full wave controlled rectifiers. • Using a center tapped transformer. • Full wave bridge circuit. • Semi converter. • Full converter. 9

  10. Different Types of Three Phase Controlled Rectifiers • Half wave controlled rectifiers. • Full wave controlled rectifiers. • Semi converter (half controlled bridge converter). • Full converter (fully controlled bridge converter). 10

  11. Principle of Phase Controlled Rectifier Operation 11

  12. Single Phase Half-Wave Thyristor Converter with a Resistive Load 12

  13. Supply Voltage Output Voltage Output (load) Current 13

  14. Supply Voltage Thyristor Voltage 14

  15. Equations 15

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  17. To Derive an Expression for the Average (DC) Output Voltage Across The Load 17

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  22. Control Characteristic of Single Phase Half Wave Phase Controlled Rectifier with Resistive Load 22

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  25. Control Characteristic 25

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  27. To Derive An Expression for the RMS Value of Output Voltage of a Single Phase Half Wave Controlled Rectifier With Resistive Load 27

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  31. Performance Parameters Of Phase Controlled Rectifiers 31

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  43. Single Phase Half Wave Controlled Rectifier With An RL Load 43

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  45. Input Supply Voltage (Vs)& Thyristor (Output) Current Waveforms 45

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  47. Output (Load) Voltage Waveform 47

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