Inverter device

Patent metadata

Field	Value
Publication number	US-11205986-B2
Application number	US-202016795831-A
Country	US
Kind code	B2
Filing date	Feb 20, 2020
Priority date	Mar 26, 2019
Publication date	Dec 21, 2021
Grant date	Dec 21, 2021

Abstract

An inverter device includes a motor, a power supply that supplies the motor with electric current, an inverter that, during regenerative operation of the motor, performs switching between a first state in which regenerative current generated in the motor is returned to the motor again and a second state in which the regenerative current is supplied to the power supply, a first detector that detects a first condition electrically acting on the inverter, a second detector that detects a second condition electrically acting on the power supply, and a determiner that performs a first determination to perform switching between the first state and the second state, based on a detection result by the first detector or the second detector.

First claim

What is claimed is:

1. An inverter device comprising:
a motor;
a power supply that supplies the motor with electric current to operate the motor;
an inverter that, during regenerative operation of the motor, performs switching between a first state in which regenerative current generated in the motor is returned to the motor again and a second state in which the regenerative current is supplied to the power supply;
a first detector that detects a first condition electrically acting on the inverter;
a second detector that detects a second condition electrically acting on the power supply; and
a determiner that performs a first determination to perform switching between the first state and the second state, based on a detection result by the first detector or the second detector.

2. The inverter device according to claim 1 , wherein the determiner performs the first determination to switch to the first state when the first condition exceeds a threshold, and performs the first determination to switch to the second state when the first condition does not exceed the threshold.

3. The inverter device according to claim 2 , wherein the determiner performs the first determination to switch to the first state when the second condition exceeds a threshold, and performs the first determination to switch to the second state when the second condition does not exceed the threshold.

4. The inverter device according to claim 3 , wherein the determiner performs a second determination to determine presence or absence of a failure in the first detector and presence or absence of a failure in the second detector, and the determiner performs the first determination based on a result of the second determination.

5. An inverter device comprising:
a motor;
a power supply that supplies the motor with electric current to operate the motor;
an inverter that, during regenerative operation of the motor, performs switching between a first state in which regenerative current generated in the motor returned to the motor again and a second state in which the regenerative current is supplied to the power supply;
a first detector that detects a first condition electrically acting on the inverter;
a second detector that detects a second condition electrically acting on the power supply; and
a determiner that performs a first determination to perform switching between the first state and the second state, based on a detection result by the first detector or the second detector; wherein
the determiner performs the first determination to switch to the first state when the first condition exceeds a threshold, and performs the first determination to switch to the second state when the first condition does not exceed the threshold;
the determiner performs the first determination to switch to the first state when the second condition exceeds a threshold, and performs the first determination to switch to the second state when the second condition does not exceed the threshold;
the determiner performs a second determination to determine presence or absence of a failure in the first detector and presence or absence of a failure in the second detector and the determiner performs the first determination based on a result of the second determination; and
when the determiner determines that the first detector has no failure in the second determination, the determiner performs the first determination based on a detection result by the first detector, and when the determiner determines that the second detector has no failure in the second determination, the determiner performs the first determination based on a detection result by the second detector.

6. The inverter device according to claim 5 , wherein when the determiner determines that the first detector has a failure and the second detector has no failure in the second determination, the determiner performs the first determination based on a detection result by the second detector, and when the determiner determines that the second detector has a failure and the first detector has no failure in the second determination, the determiner performs the first determination based on a detection result by the first detector.

7. The inverter device according to claim 6 , wherein when the determiner determines that the first detector has a failure and the second detector has a failure in the second determination, the control is stopped.

8. The inverter device according to claim 2 , wherein the determiner determines presence or absence of a failure in the first detector based on a change over time of the first condition, and determines presence or absence of a failure in the second detector based on a change over time of the second condition.

9. The inverter device according to claim 1 , wherein
the first detector detects, as the first condition, voltage applied to the inverter from the power supply, electric current flowing through the inverter, or electric power generated in the inverter; and
the second detector detects, as the second condition, voltage applied to the power supply, electric current flowing through the power supply, or electric power generated in the power supply.

10. An inverter device comprising:
a motor;
a power supply that supplies the motor with electric current to operate the motor;
an inverter that, during regenerative operation of the motor, performs switching between a first state in which regenerative current generated in the motor is returned to the motor again and a second state in which the regenerative current is supplied to the supply;
a first detector that detects a first condition electrically acting on the inverter;
a second detector that detects a second condition electrically acting on the power supply; and
a determiner that performs a first determination to perform switching between the first state and the second state, based on a detection result by the first detector or the second detector; wherein
the first detector detects, as the first condition, voltage applied to the inverter from the power supply, electric current flowing through the inverter, or electric power generated in the inverter;
the second detector detects, as the second condition, voltage applied to the power supply, electric current flowing through the power supply, or electric power generated in the power supply;
the first detector includes a first converter that converts a magnitude of the first condition; and
the second detector includes a second converter that converts a magnitude of the second condition.

Assignees

• Nidec Corp
• Nidec Elesys Corp

Inventors

• Nakada Yuhi
• Tachibana Ryo
• Mukaiyama Koji

Classifications

• Y02T10/64

  Electric machine technologies in electromobility · CPC title

• B60L3/003

  relating to inverters · CPC title

• B60L50/51

  characterised by AC-motors · CPC title

• H02H7/1227

  responsive to abnormalities in the output circuit, e.g. short circuit · CPC title

• H02P29/024

  Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load · CPC title