| 摘要 |
In pulse width modulation control for an electric power converter, occurrence of lower order harmonics, in order to suppress fractional order harmonics and direct current component even in a condition where a carrier frequency is several times as small as a frequency of a command value, pulse width modulation pulses for driving semiconductor elements composing an electric converter are calculated by comparing a command signal from a command value generating means with a carrier signal of a continuous triangular-wave having a constant period, which comprises a means for separately calculating a command value of the command signal from the command value generating means and a time product of the pulse width modulation pulses and calculating a difference value between the both time products, the pulse width modulation pulse being calculated by the difference value to the command signal from the command value generating means. <IMAGE> |
