Patent ID: 11949357
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A control circuit of a three-phase direct current motor used along with an external resistance and a three-phase inverter, the control circuit comprising:
a current detection circuit that generates a first current detection value indicating an amount of current of a first current flowing through a first phase of the three-phase inverter, wherein
the external resistance is an external part provided on a path where the first current is able to flow, and
the current detection circuit
is able to generate the first current detection value on a basis of a voltage drop of a resistance component of a first wire existing on the path of the first current, the first wire being formed from a material containing copper, or on a basis of a voltage drop of a first resistance that is an on-resistance of an arm of the first phase of the three-phase inverter, and
is able to use, as a standard, a specific current detection value based on a voltage drop of the external resistance to calibrate the first current detection value, wherein the calibration of the first current detection value is based on a relation between the specific current detection value based on the voltage drop of the external resistance and one of the voltage drop of the resistance component of the first wire or the voltage drop of the first resistance.