| 摘要 |
PROBLEM TO BE SOLVED: To provide a PWM signal creation device that creates a plurality of PWM signals of different frequencies by the use of a single clock (timer).SOLUTION: The PWM signal creation device that has a clock 17 for creating pulses of a period T0 and, on the basis of the period T0 of the pulses created by the clock 17 and a plurality of duty ratios Di, outputs a plurality of simultaneously created PWM signals of different periods Ti to be output with the duty ratios Di comprises: period multiplication means 18, 19 for multiplying the period T0 by k to produce the period Ti; and small duty ratio computation means 18, 19 for computing a duty ratio dim for each period T0 included in the period Ti resulting from the multiplication by k in the period multiplication means 18, 19. The duty ratio for the period Ti is determined on the basis of the computed duty ratio dim for each period T0. |
