Inverter input filters and servo anti-interference EMI/EMC power output three-phase filters are key devices specifically designed to reduce electromagnetic interference (EMI) and electromagnetic compatibility (EMC) issues1. The following is the relevant introduction:
Composition. These filters are mainly composed of passive devices such as inductors, capacitors, resistors, and the working principle is based on the low-pass filter circuit composed of inductors and capacitors, which allow the current of useful signals to pass through, while the interference signal with a higher frequency has a larger attenuation effect
Uses. These filters are often used in devices such as frequency converters, motors, etc. in industrial Settings to reduce the pollution of these devices to the power grid while protecting sensitive electronics from external electromagnetic noise
Type. Includes attenuation of differential mode and common mode interference, using components such as capacitors, inductors, and ferrites to achieve attenuation of interference signals
Parameters. Insertion loss and leakage current are important parameters to measure the performance of these filters. Insertion loss refers to the degree of attenuation of the noise voltage transmitted from the noise source to the load after insertion of the filter, while leakage current refers to the current flowing between the live and neutral lines and the housing under specific conditions
These filters are essential for maintaining the stability of the power system, improving the quality of the supply, and protecting sensitive electronic devices from electromagnetic interference