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Power Semiconductor Systems II

Power Semiconductor Systems II. Author: Ales Havel E-mail: ales.havel@vsb.cz Phone number: 4287 Headquarters: E227 Web page: http://homen.vsb.cz/~ hav278 /. Content of the presentation. Main types of converters AC-DC converters DC-DC converters DC-AC converters Voltage inverters

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Power Semiconductor Systems II

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

  2. Content of the presentation • Main types of converters • AC-DC converters • DC-DC converters • DC-AC converters • Voltage inverters • Single phase inverters • Three phase inverters • Current inverters • Single phase inverters • Three phase inverters • AC-AC converters

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

  4. Single phase current inverters Conducting time of switches V1 and V2 Switching off switches V1 and V2 Current commutation in the load Conducting time of switches V3 and V4 CC = commutation circuit

  5. Single phase currentinverters

  6. Single phase currentinverters • Single phase inverter with switchable power components (IGBTs) • Advantages: • No need of using accumulation circuit with diode rectifier • Parallelly connected capacitors will take the source current in the transistor switching times • Short switching times of used IGBT transistors and faster current commutation • Lower power losses, because the IGBTs are switched with zero voltage (ZVS)

  7. Three phase currentinverters Three phase current inverter with interphase commutation • Advantages: • Most widely used variant with • commutation circuits • Commutation capacitors are separated by • isolating diodes • Voltage on the capacitors is therefore not • affected by the load • Interphase circuit provides commutation • andaccumulation functions

  8. Three phase currentinverters Three phase current inverter with switchable power parts (IGBTs) • Advantages: • By utilization of switchable power • parts is possible to reach better • quality of the output current • Capacitive character of the load • due to use of accumulation capacitors • Load capacitors are also acting as • an output filter of the inverter, so • although the phase currents are • pulse width modulated, the load • currents are almost harmonic

  9. Three phase current inverters Active and reactive power flow in current inverters Current inverter The average load power value is given by:

  10. Thank You for your attention

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