| 摘要 |
PROBLEM TO BE SOLVED: To obtain a control apparatus by which the distortion of an output current is suppressed by a method wherein one out of an upper switching element and a lower switching element is ON/OFF-controlled according to the positive polarity or the negative polarity of the output current and the switching element on the other side is operated in a control mode in which the element is set to an always truned-off state. SOLUTION: A current control means 6 outputs, to an adder 9, a voltage command signal V* at an amplitude according to a deviation signal Δi. On the other hand, a computing circuit 7a ON/OFF-controls a switching element S1, and it outputs, on the basis of an output current (i), a distortion compensation signal Vc 1 in a control mode in which a switching element S2 is always turned off. In addition, a computing circuit 7b ON/OFF-controls the switching element S2, and it outputs, on the basis of the output current (i), a distortion compensation signal Vc 2 in a control mode in which the switching element S1 is always turned off. One out of the distortion compensation signals Vc 1, Vc 2 is selected by a changeover circuit 8, outputted to the adder 9 and added to the voltage command signal V* to change a voltage command value. |
