| 摘要 |
<p>PURPOSE:To increase the driving force of a motor temporarily by mounting an emergency switch augmenting currents fed to the motor exceeding a rated value. CONSTITUTION:A comparator IC1 compares acceleration voltage Vacc and a saw tooth signal, and feeds a switching signal Va consisting of a pulse waveform, in which pulse width interrupting for a fixed period changes, to a transistor TR. When voltage generated in a shunt resistor R1 is lower than reference voltage VR, an output from the comparator IC1 reaches a low level, and the transistor TR is turned OFF. When an emergency switch S is turned On, the other hand, the transistor TR is short-circuited through a resistor R2, and currents flows regardless of a current limiting value. Accordingly, overcurrents can be caused to flow through a motor M.</p> |
