Why do some inverters (VFDs) needs a reactor at the input or DC choke in the DC bus? | Schneider Electric United Arab Emirates

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Why do some inverters (VFDs) needs a reactor at the input or DC choke in the DC bus?

In order to smooth the current a choke can be placed upstream the inverter 2 locations possible:

In the DC bus
Onto the main supply

Choke

Effect of the choke

The efficiency of the choke on harmonics is depending on its impedance
Higher the impedance, lower the harmonic distortion
But higher the impedance, higher the drop voltage

Released for:Schneider Electric United Arab Emirates

Published on:12/11/2019Last Modified on:25/05/2025

Range:

Altivar 71

Altivar 61

Altivar Process ATV600

Altivar Process ATV900

Range:

Altivar 71

Altivar 61

Altivar Process ATV600

Altivar Process ATV900