| 摘要 |
The present invention relates to an overcurrent detecting device and an overcurrent detecting method each of which detects an overcurrent upstream of an inverter circuit in a drive control device for an electric motor. The overcurrent is detected without providing a shunt resistor in the upstream of the inverter circuit, and miniaturization of a circuit substrate is achieved. The overcurrent detecting device calculates a current value of a power supply line from each phase current supplied to the electric motor and a power supply voltage of the inverter circuit, and detects an overcurrent, based on a current value determined from a drop voltage value by an electronic part connected to the power supply line and the current value of the power supply line. |
