| 摘要 |
PROBLEM TO BE SOLVED: To improve insufficient trackability, in the case a gain or the like of a control system is to be controlled, in order to control the current to be supplied to a load using a proportional integration control system provided. SOLUTION: An inverter 1 is controlled with a controller which includes a PI control unit 4, and a voltage calculating unit 7 obtains, for driving a load 2, an output voltage Vi having the polarities of the inverter, based on the power supply voltage of inverter, a gate signal and a load current. A load voltage estimating unit 8 estimates a load voltage Vl from the voltage Vi, a load current (i) and a known inductance L. The load voltage quick change determining means 9, 10 is set forcibly, when sudden change of a load voltage is estimated, the integral value of an integral element 4C being in a direction which enhances the trackability of the proportional integral control. When an interlinked system power supply and a solenoid are used as the load 2, adjustment of the integral gain of control element or proportional gain is also included. |
