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Imput Rectifier Bridge

The input rectifier bridges provide D.C. voltage and current to the D.C. link.
According to the technology adopted, the following VFD rectifier solutions are acceptable:
Current source systems:
 12 pulse rectifier with controlled thyristors, with a D.C. line reactor and with 2 winding secondary phase shifting isolation transformer.

Voltage source systems:
 Normal 6 or 12 or 24 bridge diode rectifier with 2/4 winding secondary phase shifting isolation transformer;
 6 or 12 or 24 bridge SCR thyristors rectifier with 2/4 winding secondary phase shifting isolation transformer;
 PWM rectifier (Pulse Width Modulation, Active Front End device) with AC line reactor or isolation transformer.