| 摘要 |
PURPOSE:To improve a responsiveness against a variation of an input condition by controlling a duty of a driving pulse given to a load by adding a variation of an input condition generated in one period of the pulse concerned. CONSTITUTION:A mirocomputer is made to have in advance a conversion characteristic of an input condition and a duty, the duty is determined in accordance with the input condition, and a pulse of a constant period is outputted. Said computer has a rewritable memory K in ordet to count a sampling pulse of a period (t), and to vary a control target value at every time (t) extending from the upper limit Ne1 to the lower limit Ne2. At the time of start, for instance, N=100 is preset and a period T1 is set, by which a resolution of a duty is determined. At the same time, the upper limit revolving speed Ne1 is preset to the memory K, and positive or negative of the target value K and the actual sample revolving speed Ne is decided. In this way, a level of an output pulse is inverted at the time point when said revolving speed has coincided with the target value, and the duty is determined. |
