| 摘要 |
PURPOSE:To arbitrarily set starting position and number for performing PWM control by driving an EPROM with a clock pulse having the prescribed frequency as an address input. CONSTITUTION:EPROMs 8, 9 are driven by a clock pulse having a frequency of n-times of 2 of a commercial sinusoidal wave to reduce a pulse width modulators of the number equal to that of irregular pulse number necessary in the conventional PWM control system to one to improve and stabilize the accuracy of a CVCF output sinusoidal wave, and to control the starting position and number of performing the PWM control of a transistor inverter only by data stored in the EPROMs 8, 9 and further the pulse width modulation factor. |
