| 摘要 |
PURPOSE:To exactly limit current even if the gain of the amplifier of a current control circuit is low, by making a pulse width limit circuit reset when a current detection value exceeds a previously set current limit value. CONSTITUTION:Between a PWM circuit 5 and a driving circuit 7, a pulse width limit circuit 6 is set. By this organization, when current flowing to a motor 1 gets increased more than a limit value, then the pulse of PWM circuit output is stopped by the pulse width limit circuit 6, and again, the output of pulse from the pulse width limit circuit 6 is generated with the rise of the pulse of the PWM circuit output, and by starting current to be made to flow to the motor 1, the current of the motor 1 is limited. |
