| 摘要 |
PURPOSE:To provide a current control device wherein an output signal is set by a bias signal, and thereafter it is increased from the above described set value by a forcing signal, thereby to remove a rush current and to reduce the waste time at the time of change-over. CONSTITUTION:In controlling the quantity of a current supplied to a motor by a thyristor with an intergrating function both current command IR and a feedback signal IF become zero at the time of changing the torque direction, and the rectifier and inverter of the power converter are gated off. A switch 85C becomes conductive by a signal SB3 from a logical control circuit, and the output signal VO is set by a bias signal VB at the value of R4/R5 VB. Thereafter, the switch 85C is turned off and the switch 85b is turned on to supply as input a forcing signal and to gradually increase the output VO to remove a rush current and, at the same time, to reduce the waste time at the time of change-over. |
