Filters for Frequency Inverters

Various types of filters are used in frequency inverters:

1. Input filters: they are mounted on the input side of the frequency inverter and are designed to reduce electromagnetic interference from the power supply. They help achieve EMC (electromagnetic compatibility) standards by limiting noise returning to the electrical network.

2. Output filters: mounted on the output side, these filters reduce high-frequency components generated by the frequency inverter. They help ensure a cleaner output waveform, reduce voltage spikes and harmonic distortions that may affect other connected equipment or cause motor insulation problems.

3. Common mode and differential mode filters: these filters are applied to specific types of interference. Common mode filters suppress noise that occurs simultaneously on both input lines (with respect to ground), while differential mode filters address noise between input lines.

Filter selection depends on various factors, including the specific application, connected equipment requirements, and compliance regulations. Filters can help improve the overall performance and reliability of the frequency inverter system by managing electromagnetic interference.