| 摘要 |
A power converter that reduces a ripple of a torque and a ripple of an electric current in a switch period, having a controller including an instruction calculator that calculates a first voltage instruction value and a second voltage instruction value when, in a first period, a first neutral point voltage is shifted below a center-of-output value, and a second neutral point voltage is shifted above the center-of-output value, and, in a second period, the first neutral point voltage is shifted above the center-of-output value, and the second neutral point voltage is shifted below the center-of-output value. |
| 主权项 |
1. A power converter for converting an electric power supplied to a rotation electric machine that has a first winding group and a second winding group, the power converter comprising:
a first inverter having a first switching element respectively corresponding to plural phases in the first winding group; a second inverter having a second switching element respectively corresponding to plural phases in the second winding group; a controller that includes an instruction calculator calculating a first voltage instruction value that is applied to the first winding group, and a second voltage instruction value that is applied to the second winding group, wherein the instruction calculator calculates the first voltage instruction value and the second voltage instruction value in a voltage instruction switching scheme, for switching between a first period and a second period at a preset switch period when the voltage instruction switching scheme is implemented by the instruction calculator during which, (i) in the first period, a first neutral point voltage is shifted downward to be below a center-of-output value of an outputtable voltage range, and a second neutral point voltage is shifted upward to be above the center-of-output value of the outputtable voltage range; and (ii) in the second period, the first neutral point voltage is shifted to be above the center-of-output value of the outputtable voltage range, and the second neutral point voltage is shifted to be below the output median value of the outputtable voltage range, so that a time constant of change of each of the first neutral point voltages and second neutral point voltages becomes greater than a preset time constant. |
