EMC filter for regenerative applications

May 10, 2021 // By Jean-Pierre Joosting
EMC filter for regenerative applications
Filter series suitable for use in Active Infeed Converter or Active Front End applications where energy is fed back to the power grid.

Schaffner has introduced the FN3840 for use in Active Infeed Converter (AIC) or Active Front End (AFE) applications where energy is fed back to the power grid. This process reduces energy costs in larger factories or can be used to reduce losses and excess heat in converters. When the semiconductors of the converters are switching directly towards the mains power network, they create a high voltage and current ripple. The inclusion of an LCL-filter such as the recently launched FN6840 can further reduce this effect and improve power quality.

The FN3840 series of filters provide state-of-the-art EMI attenuation based on an innovative filter topology and help to ensure compliance with Class C2 or even C1 limits. Applications include regenerative drives in combination with LCL filters, active infeed converter (AIC), active front end (AFE) variable frequency drives (VFD), three-phase variable speed drives (VSD) and power drive systems (PDS), renewable energy, machine tool and machinery equipment, process automation equipment.

In systems where compliance to EMC regulations at frequencies above 150 kHz need to be considered not every EMC-filter can be connected in-line with an LCL-filter. The inductive components of an LCL-filter can resonate with the capacitors of the EMC-filter and vice versa. To overcome those effects and to avoid damage of the drive, a careful design of the EMC-filter circuit is mandatory. The latest Schaffner FN3840 has been fully tested and may be combined with a Schaffner FN6840 LCL-filter in an AIC/AFE application.


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