Figure 5: A post-rectification chopper reduces current distortions and improves the PF. (Image source: Infineon Technologies)
Applying the post-rectification chopper using insulated gate bipolar transistors (IGBTs) eliminates the need for the OLTC transformer, reduces current distortions, and improves the PF. Infineon Technologies’ FD450R12KE4PHOSA1 is an IGBT chopper module intended for these applications. It is rated for a maximum voltage of 1200 V and a maximum collector current of 450 A, and comes in a standard 62 millimeter (mm) C-series module. More advanced rectifier circuits include IGBT-based active rectifiers. Active rectifiers replace diodes or thyristors with IGBTs that a controller switches on and off at appropriate times via a gate driver (Figure 6).
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