Circuit Operation

The circuit of the three-phase fully-controlled bridge rectifier circuit with an RL load and a voltage source has been shown above. The purpose of providing a dc source in the dc link is to illustrate how two-quadrant operation can take place. When the firing angle is held between 0^o and 90^o, the circuit operates in the rectifier region. When the firing angle is held between 90^o and 180^o, the circuit can operate in the inverter region if the source E is sufficiently negative. In the inverter region, the power flow is from the dc link to the ac 3-phase source. The inductor reduces the ripple in dc link current.

 
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