| 摘要 |
PROBLEM TO BE SOLVED: To provide a current detection apparatus configured to improve accuracy of detecting multi-phase AC current using one current sensor for detecting DC-side current.SOLUTION: A current detection apparatus includes a current calculation part 40 which calculates currents flowing in each of phases on the output side of an inverter IVT, on the basis of a current value Idc on the DC side of the inverter IVT detected by a current sensor 30. The current sensor 30 detects magnetic fields to be generated in electrodes 11P-13P, 11N-13N when currents flow in switching elements 111-131, 112-132 of the inverter IVT. The current sensor 30 is arranged so that detection sensitivity of the magnetic fields in the electrodes 11P-13P, 11N-13N is changed by phase. The current calculation part 40 calculates currents Iu, Iv, Iw flowing on the output side of each of the phases, on the basis of operation states of the switching elements 111-131, 112-132, the current value Idc detected by the current sensor 30, and the detection sensitivity. |
