| 摘要 |
PURPOSE:To synchronize the working of current limit and the period of release, with the period of an oscillator by synchronizing the hysteresis of a current limiting comparator with the oscillator, to be released. CONSTITUTION:When motor current is detected by a current detector 5 and reaches a previously set value VCL, then the output of a current limiting hysteresis comparator 6 comes to a level H, and via a logical product circuit 8, a power amplifier 1 is controlled, and the motor current is reduced. In the meantime, in case of the voltage of the highest output of an oscillator 4, the hysteresis of the hysteresis comparator 6 is released by a hysteresis releasing means 10. Then, the motor current is increased again, and the hysteresis comparator 6 is worked again. After that, the working is repeated, and current is limited. |
