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Power Semiconductor Systems I

Power Semiconductor Systems I. Author: Ales Havel E-mail: ales.havel@vsb.cz Phone number: 4287 Headquarters: E227 Web page: http://homen.vsb.cz/~ hav278 /. Presentation contents. Main types of converters AC-DC converters Single phase rectifiers Construction possibilities, wiring

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Power Semiconductor Systems I

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  1. Power Semiconductor Systems I Author: Ales Havel E-mail:ales.havel@vsb.cz Phone number: 4287 Headquarters: E227 Web page: http://homen.vsb.cz/~hav278/

  2. Presentation contents • Main types of converters • AC-DC converters • Single phase rectifiers • Construction possibilities, wiring • Load voltage and current waveforms • Mathematics • Neat examples • Three phase rectifiers • Construction possibilities, wiring • Load voltage and current waveforms • Mathematics • Neat examples • DC-DC converters • DC-AC converters • AC-AC converters

  3. Power converters • A power semiconductor converter is an electrical device for converting electrical energy.

  4. Division of AC/DC converters • Properties of rectifiers • Number of input phases • Single phase rectifiers • Three phase rectifiers • n – phase rectifiers • Number of pulses • P = 1, 2, 3, 6… • Possibilities of output voltage control • Without control • Diode rectifiers • Half-controlled rectifiers • Diodes + Thyristors • Full-controlled rectifiers • Thyristors • Wiring • Bridge rectifiers • Node rectifiers

  5. Half-wave single phase diode rectifiers Voltage Resistive load Current Voltage Inductive load Current

  6. Half-wave single phase diode rectifiers Voltage R+L load Current Voltage R+L+D0 load Current

  7. Half-wave single phase diode rectifiers Voltage R+C load Current Voltage R+V load Current

  8. Two pulse diode rectifiers Voltage Current

  9. Two pulse thyristor controlledrectifiers

  10. Important mathematical relations The output AVG voltage of diode rectifier or thyristor rectifier with control angle α = 0°: The output AVG voltage of thyristor rectifier with control angle α. Condition 1: The load current must be continuous Condition 2: No parallel bypass diode on the load

  11. Example 1- submission Calculate the output AVG voltage of the 2-pulse bridge controlled rectifier, if you know the following values: α = 60°, U1 = 230V

  12. Example 1- solution a) General calculation approach: b) Calculation utilizing the basic relation: c) Calculation utilizing the table values:

  13. Example 1- question? How will change the output AVG voltage value if we use the bypass diode parallel to the load? Solution:

  14. Six pulse thyristor controlled rectifiers

  15. Six pulse thyristor controlled rectifiers

  16. Thank You for your attention

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