| 摘要 |
PURPOSE:To attain the duty control over a wide range in terms of software inexpensively by adopting the constitution that a setting means is switched when the duty is changed largely or smally from a prescribed value so as to activate the titled circuit with a pulse width where a prescribed value or over of duty ratio is always obtained. CONSTITUTION:A CPU 1 is provided with the 1st setting means presetting the 1st data deciding the time from the trailing of an output pulse signal to the next leading and the 2nd data deciding the time from the trailing of the output pulse signal to the next trailing respectively to the 1st and 2nd comparison means 5, 6, and the 2nd setting means presetting the 3rd data deciding the time from the leading of the output pulse signal to the next trailing and the 4th data deciding the time from the leading of the output pulse signal to the next trailing respectively to the 1st and 2nd comparison means 5, 6. Whether or not the duty of the output pulse signal exceeds a prescribed value is detected to select and activate either the 1st setting means or the 2nd setting means.
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