| 摘要 |
PURPOSE:To generate PWM signals by simple constitution by extracting difference between a voltage command pattern and the momentary value of inverter output voltage and inverting the polarity of the output voltage of the inverter from the quantity of the difference integrated. CONSTITUTION:The voltage command pattern for commanding the output voltage of the inverter and the output signals of a comparator 6 are added to an integrator 5, and the quantity of difference between both signals integrated is extracted. When the quantity of integration reaches predetermined value or more, the polarity of the output signals of the comparator 6 is inverted. Consequently, the output signals of the comparator 6 are controlled so that the mean value is made proportioned to the instantaneous value of the voltage command pattern at every period when the polarity of the signals is changed to positive value or negative one. Accordingly, the output voltage of the inverter is controlled so as to be made proportional to the voltage command pattern. |
