INVERTER AND PWM MODULATION METHOD THEREOF

摘要

The present invention discloses an inverter and its PWM modulation method, where the PWM modulation method includes providing a modulation signal, obtaining an amplitude value of a third harmonic according to a modulation ratio of the modulation signal, injecting the third harmonic into the modulation signal and generating a PWM drive signal, and inputting the PWM drive signal into the control end of an inverter switch tube to control turning on or turning off of the inverter switch tube. Through the foregoing method, the present invention can achieve that the inverter has maximum bus utilization and minimum common-mode voltage to avoid generating relatively high ground leakage current and relatively serious electromagnetic interference.