| 摘要 |
<p>PURPOSE:To achieve a slow exciting function through a simple digital circuitry by varying the phase difference between two counters operating at a predetermined clock depending on the comparison result between the output voltage from an alternator and a reference voltage. CONSTITUTION:When the charging voltage of a battery 3 is lower than a reference voltage, conduction of an exciting Tr 12 is controlled by Q output from a hold circuit 19. The hold circuit 19 is set by an 2n signal from a counter 15 and then reset by a 2<0> signal from a counter 16. When the count of the counter 15 reaches 2<n>, the counter 15 is reset to 2<0> during Hi interval of a CK 3 and thereby torque and output current of the generator 2 increase gradually. When the charging voltage of the battery 3 is higher than the reference voltage, the exciting Tr 12 is turned OFF to decrease output current from the generator 2. In this regard, the counter 16 is stepped by 1 and the phase difference between the counters 15, 16 is reduced thus decreasing the output duty of the hold circuit 19.</p> |
