| 摘要 |
PURPOSE:To stabilize the operation of a frequency control device by detecting the current value of a power source inputted to an inverter, integrating the detected value, then comparing it with a reference value, resetting the integrated value with the output, and applying a pulse generated by the operation to the thyristor of an inverter. CONSTITUTION:The current value of a power source inputted to an inverter 10 is detected by a current detector 11, and the negative value of the detected current value and the predetermined voltage reference value are added by an adder 12. After the output of the adder 12 is integrated by an differentiator 13, it is inputted to a comparator 14, which compares it with the predetermined voltage reference value. When the output value of the differentiator 13 becomes equal to the voltage reference value, the integrated value in the differentiator 13 is cleared by a resetting circuit 15. The output of the comparator 14 is applied through a pulse distributor 14 to the thyristor of the inverter 10. |
