Filter inductors are generally made of ferrite materials, which can be easily combined with through-hole capacitors to form composite filters. In high-performance filters, wire wound inductors are also used. However, it should be noted that ferrite materials will experience magnetic saturation at high currents, reducing the efficiency of the filter.

In a full bridge inverter, the output filtering inductor is a critical component, and the grid connected system requires a power factor of 1, a sine wave waveform, and an output current that is the same as the grid voltage frequency on the output side of the inverter. Therefore, the appropriate selection of inductance value directly affects the performance of the circuit.

T as frequency

The inverter should operate synchronously with the grid when connected to the grid. The allowable deviation of the AC output frequency of the inverter is the rated frequency of the power grid.

DC component

During grid connected operation, the DC current component fed by the inverter to the grid should not exceed 0.5% of its rated output current or 5mA, whichever is greater.

Launch requirements

The electromagnetic emissions of inverters operating normally in residential, commercial, and light industrial environments should not exceed the emission limits specified in CB 17993; The electromagnetic emission of the input transformer connected to the industrial power grid and operating normally in the industrial environment should not exceed the emission limit specified in CGB 177 3.