Three phase inverters
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Three-Phase Inverters. Consider three single-phase inverters in parallel, driven 120 ° apart. Three-Phase Inverter (continued). Three single-phase full bridge inverters. 12 transistors, 12 diodes, 3 transformers Could it be simpler?. Alternative (Preferred) Configuration.

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Three phase inverters l.jpg
Three-Phase Inverters

Consider three single-phase inverters in parallel, driven 120° apart.


Three phase inverter continued l.jpg
Three-Phase Inverter (continued)

Three single-phase full bridge inverters

12 transistors, 12 diodes, 3 transformers

Could it be simpler?


Alternative preferred configuration l.jpg
Alternative (Preferred) Configuration

6 transistors, 6 diodes conduction for 120° or 180°


180 conduction l.jpg
180° Conduction

  • Three transistors ON at a time



Waveforms for 180 conduction l.jpg
Waveforms for 180 Conduction


Phase voltages for 180 conduction l.jpg
Phase Voltages for 180 Conduction


Waveforms for 180 conduction8 l.jpg
Waveforms for 180 Conduction




Mode 1 operation11 l.jpg
Mode 1 Operation

Q1, Q5, Q6 conduct




Mode 2 operation14 l.jpg
Mode 2 Operation

Q1, Q2, Q6 conduct




Mode 3 operation17 l.jpg
Mode 3 Operation

Q1, Q2, Q3 conduct


Phase voltages for 180 conduction18 l.jpg
Phase Voltages for 180 Conduction





Rms value of the nth component l.jpg
rms value of the nth Component

Fundamental Component





Dc supply current l.jpg
DC Supply Current

IL=√3Io is the rms load line current

Vo1= fundamental rms output line voltage

Io is the rms load phase current

Θ1 = the load impedance angle at the fundamental frequency