Electric power control unit

An electric power control unit configured to control drive power of a three-phase alternating current to be supplied to an electric motor, the electric power control unit comprising:

• an inverter configured to convert a direct current to the three-phase alternating current;
• first and second current sensors, each of which is configured to measure a first-phase current in the three-phase alternating current;
• third and fourth current sensors, each of which is configured to measure a second-phase current in the three-phase alternating current;
• a fifth current sensor configured to measure a third-phase current in the three-phase alternating current;
• and
• a controller configured to control the inverter,
• wherein
• under a condition in which the fifth current sensor fails, when measured values of the first and the second current sensors do not coincide with each other or measured values of the third and the fourth current sensors do not coincide with each other, the controller stops to further supply the drive power to the electric motor.

An electric power control unit configured to control drive power of a three-phase alternating current to be supplied to an electric motor, the electric power control unit comprising:

• an inverter configured to convert a direct current to the three-phase alternating current;
• first and second current sensors, each of which is configured to measure a first-phase current in the three-phase alternating current;
• third and fourth current sensors, each of which is configured to measure a second-phase current in the three-phase alternating current;
• a fifth current sensor configured to measure a third-phase current in the three-phase alternating current;
• and
• a controller configured to control the inverter,
• wherein
• under a condition in which the first current sensor fails, when measured values of the second, the third, and the fourth current sensors do not coincide with each other while the inverter is shut down, the controller stops to further supply the drive power to the electric motor.