| 摘要 |
PROBLEM TO BE SOLVED: To compensate an output voltage error caused by dead time or ON voltage drop in PWM modulation.SOLUTION: An output voltage of a PWM inverter or an input voltage of a PWM converter is detected by a voltage detection circuit. The voltage detection circuit using an A/D converter for performing ▵&Sgr; modulation integrates bit data converted by the A/D converter, converts the integrated value into a digital value at timing synchronized with a PWM gate signal generating carrier and calculates a reference wave component of the detection voltage. The voltage detection circuit calculates a difference between the reference wave component and a voltage command of the PWM inverter (or the PWM converter) and outputs an addition value of the difference and the voltage command to a PWM modulation part. |
