„Basic Strategies in Power Electronics“

Referents:Prof. Dr.‐Ing. Hans‐Georg Herzog

(hg.herzog@tum.de)Prof. Dr.‐Ing. Ralph Kennel

(ralph.kennel@tum.de)Technische Universität München

Arcisstraße 2180333 München

Germany

LecturePower Electronics

Signal Electronics Power Elektronics

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Emitter Topology

why?

Basis Topology Collector Topology

which topology is that ?

Emitter TopologyBasis TopologyCollector Topology

why ?

Fundamental Structure of Power Electronics

signalelectronics

driverconverter

filter

mains

load

filter

power electronic system

electronics

Basic Strategies in Power Electronics

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(idealized) main components in power electronics

voltage source

switch(power device)

current source

Basic Strategies in Power Electronics

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voltage source

current source

capacitor

=

(idealized) main components in power electronics

switch(power device)

Basic Strategies in Power Electronics

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voltage source

current source

capacitor

=

=inductance

(idealized) main components in power electronics

switch(power device)

Basic Strategies in Power Electronics

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In which cases can (power semiconductor) switches be used ?

voltage source switch(power device)

current source

operation point

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Basic Strategies in Power Electronics

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voltage source

operation point ?

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it is not possible to connect 2 voltage sources like this

voltage source switch(power device)

Basic Strategies in Power Electronics

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current source

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the same is valid for 2 current sources

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voltage source switch(power device)

operation point ?

Basic Strategies in Power Electronics

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current source

current source

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what can one do, if 2 current sources have to be connected anyway ?

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one „changes“ one of the current sources to a voltage source

how ???

with a capacitor !!!

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operation point

voltage sourceswitch

(power device)

Basic Strategies in Power Electronics

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voltage source

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what can one do, if 2 voltage sources have to be connected ?

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one „changes“ one of the voltage sources to a current source

how ???

with an inductance !!!

current source

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operation point

voltage source switch(power device)

Basic Strategies in Power Electronics

examples

electrical (voltage) power supply

= voltage source

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electrical motor

= voltage source with inductance

= current source

power electronics(inverter)

does that work ?

YES !

this is a line commutated inverter !

Basic Strategies in Power Electronics

electrical (DC voltage) board power supply

= voltage source

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electrical motor

= voltage source with inductance

= current source

power electronics(inverter)

does that work ?

YES !

this is a drive in automotive application !

examples

Electrical Energy Conversion by Converters(Power Electronics)

Rectifier Inverter

Converter… if output frequency = input frequency :

(AC) Power Controller

DC/DC ConverterChopper Controller

Gleichrichter Wechselrichter

Gleichstromsteller

Umrichter (wenn Ausgangsfrequenz identisch zu Eingangsfrequenz: Drehstromsteller)

ConvertersconvertersStromrichter

buck converterTiefsetzsteller

(AC) power controllerDrehstromsteller

chopper controllerGleichstromsteller

convertersUmrichter

power controllersSteller

boost converterHochsetzsteller

direct converterDirektumrichter

cyclo converter

matrix converterMatrixumrichter

RectifierGleichrichter

InverterWechselrichter

link inverterZwischenkreisumrichter

current source inverter(CSI)

Stromzwischenkreisumrichter

resonance inverterResonanzumrichter

voltage source inverter(VSI)

Spannungszwischenkreisumrichter