The circuit consist of 6 thyristors, T1, T2, T3, T4, T5, T6, a three phase supply and a RL load.
The thyristors T1, T3, T5 form the positive group.
The thyristors T4, T6, T2 form the negative group.
Thyristors T1, T3, T4, T6 produces the full wave recitified output of Vab across the load.
Thyristors T3, T5, T6, T2 produces the full wave recitified output of Vbc across the load.
Thyristors T1, T5, T4, T2 produces the full wave recitified output of Vca across the load.
All these 3 outputs are given simultaneously to the same RL load. The effect is that all the 3
individual output mentioned above gets superimposed on each other to get the final output.
The waveform of the output for different firing angles are shown below.
The average output voltage can be varied by varying the firing angle.
For firing angle < 90, the circuit works as rectifier.
For firing angle > 90, the circuit works as Line commutated inverter.
GADDALA JAYA RAJU (2020). Three Phase Fully Contolled Bridge Rectifier (https://www.mathworks.com/matlabcentral/fileexchange/73072-three-phase-fully-contolled-bridge-rectifier), MATLAB Central File Exchange. Retrieved .