Volume 39 Issue 3
Mar.  2013
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Wang Tingling, Xiong Junhua, Zhang Jinet al. Random PWM method based on pre-determined carrier frequencies[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(3): 355-360. (in Chinese)
Citation: Wang Tingling, Xiong Junhua, Zhang Jinet al. Random PWM method based on pre-determined carrier frequencies[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(3): 355-360. (in Chinese)

Random PWM method based on pre-determined carrier frequencies

  • Received Date: 23 Feb 2012
  • Publish Date: 31 Mar 2013
  • For reported random frequency pulse width modulation(PWM) methods, harmonic distortion appears in the output waveform because the relationship between the carrier frequencies and their changing frequency is not carefully considered. To cope with the above obstacle, the effect of carrier changing frequency on the randomized carrier signals was investigated. A fact that phase mismatch of the two changing carrier signals induces the output voltage distortion was subsequently obtained. Then, a proposed approach was to select the switching frequency randomly among a few pre-determined carrier frequencies. Both simulation and experimental results verify that using the proposed PWM technique, the dominant harmonic clusters are effectively reduced while retaining good sinusoidal output waveforms, which are superior to that based on the conventional random PWM methods.

     

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