Abstract: To make the harmonic elimination PWM-control inverter be of a good sine wave output‚by taking the convert -er characteristic of none low-harmonic into consideration‚the two-stage low-pass L－C filtration network was used to the inverter circuit．The theoretical analyses and calculated results indicate that the low-pass filter will increase the capacity demand of the inverter circuit‚and the parameter variation of the filter will strongly affect the output current and output voltage of the inverter．Furthermore‚the design and parameter calculation method of the filter were proposed．It is re-vealed that‚when the output current stress decreases and the utilization coefficient increases as efficiently as possible‚the correct selection of filter parameters can optimize the output performance of the inverter．

Key words: inverter, filter, harmonic elimination control, high-passed filter