| 摘要 |
<p>PURPOSE:To prevent fluctuation of engine rotation by preventing abrupt increase of field coil exciting duty at the time of abrupt increase of electric load. CONSTITUTION:A generated voltage VB is compared with a reference voltage Vr through a comparator 11 output therefrom is then compared with a sawtooth wave to produce a duty pulse comparing signal S1 having a predetermined period, and the exciting duty of a field coil 21 is controlled by a gate pulse signal S2 through a transistor 12. When the gate pulse has '1' level, an up- counter 13 functions and the count thereof is stored, as a value representing the exciting duty, in a latch 14. A pulse width generating circuit 15 then generates a pulse having pulse width corresponding to thus stored count plus 1 and thus generated pulse is fed to a gate 102. When an electric load 2 increases abruptly to sustain '1' level of the comparison signal, the gate opens and gate pluse signals increasing sequentially count by count are fed to the transistor thus increasing the exciting duty gradually.</p> |
