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
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
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