Inverter control apparatus and control method thereof

Patent metadata

Field	Value
Publication number	US-9520768-B2
Application number	US-201414286682-A
Country	US
Kind code	B2
Filing date	May 23, 2014
Priority date	Jul 16, 2013
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

An apparatus and method for controlling an operation of an inverter are provided. In the inverter control apparatus, an operation signal input unit detects a current of each phase output from an inverter. An error detecting unit detects whether there is a fault of the inverter on the basis of the current detected by the operation signal input unit. A controller controls driving of the inverter according to a type of the fault detected by the error detecting unit. A storage unit stores a kind of fault of the inverter and a corresponding fault type on the basis of the current detected in the operation signal detecting unit.

First claim

What is claimed is:

1. An inverter control apparatus comprising:
an operation signal input unit detecting a current of each phase output from an inverter;
an error detecting unit detecting whether there is an inverter fault based on the detected current;
a controller controlling driving of the inverter according to a type of the detected inverter fault; and
a storage unit storing a fault state of the inverter and a corresponding fault type based on the detected current,
wherein the controller classifies the detected fault into a first fault type limiting an input command value according to the detected fault, a second fault type disabling the driving of the inverter, a fault third type temporarily disabling the driving of the inverter and re-enabling the driving of the inverter according to a condition to drive the inverter, and a fourth fault type turning on/off the driving of the inverter, and
wherein the controller outputs an inverter driving control signal corresponding to the detected fault type according to a preset priority.

2. The inverter control apparatus according to claim 1 , wherein;
the controller turns on/off the driving of the inverter for a predetermined period or for a predetermined number of times when the fourth fault type is detected; and
the controller disables the driving of the inverter when the fault is detected for the predetermined number of times or during the predetermined period.

3. The inverter control apparatus according to claim 1 , wherein the controller prevents an input torque command value of a specific value or greater from being input or reduces a preset command value when the first fault type is detected.

4. The inverter control apparatus according to claim 1 , wherein the controller disables the driving of the inverter when the third fault type is detected, detects whether a power state returns to a normal state, and re-enables driving of the inverter when the power state returns to the normal state.

5. The inverter control apparatus according to claim 1 , wherein the controller sets the second fault type to have a highest priority when the priority is determined according to the detected fault type.

6. The inverter control apparatus according to claim 5 , wherein the priority according to the detected fault type is set in order of the second fault type, the third fault type, the fourth fault type, and the first fault type.

7. The inverter control apparatus according to claim 5 , wherein the controller controls to drive the inverter according to the detected fault type having the highest priority and ignores a detected fault type having a lower priority.

8. An inverter control method comprising:
detecting a current of each phase output from an inverter;
detecting whether there is an inverter fault based on the detected current;
storing a fault state of the inverter and a corresponding fault type based on the detected current; and
controlling driving of the inverter according a type of the detected inverter fault;
wherein controlling the driving of the inverter comprises classifying the detected fault into a first fault type limiting an input command value according to the detected fault, a second fault type disabling the driving of the inverter, a third fault type disabling the driving of the inverter and then re-enabling the driving of the inverter according to a condition to drive the inverter, and a fourth fault type turning on/off the driving of the inverter, and
wherein controlling the driving of the inverter further comprises outputting an inverter driving control signal corresponding to the detected fault type according to a preset priority.

9. The method according to claim 8 , further comprising:
turning on/off the driving of the inverter for a predetermined period or for a predetermined number of times when the fourth fault type fault is detected; and
disabling the driving of the inverter when the fault is detected for the predetermined number of times or during the predetermined period.

10. The method according to claim 8 , further comprising preventing an input torque command value of a specific value or greater from being input or reducing a preset command value when the first fault type is detected.

11. The method according to claim 8 , further comprising disabling the driving of the inverter when the third fault type is detected, detecting whether a power state returns to a normal state, and re-enabling driving of the inverter when the power state returns to the normal state.

12. The method according to claim 8 , further comprising setting the second fault type to have a highest priority when the priority is determined according to the detected fault type.

13. The method according to claim 12 , further comprising setting the priority according to the detected fault type in order of the second fault type, the third fault type, the fourth type, and the first fault type.

14. The method according to claim 12 , further comprising controlling to drive the inverter according to the detected fault type having the highest priority and ignoring a detected fault type having a lower priority.

Assignees

• Lsis Co Ltd

Inventors

• Kim Kwang Woon

Classifications

• H02M7/06

  using discharge tubes without control electrode or semiconductor devices without control electrode · CPC title

• H02M2001/327

  Electricity · mapped topic

• H02H7/122

  for inverters, i.e. DC/AC converters · CPC title

• H02M7/53875

  with analogue control of three-phase output · CPC title

• H02M7/48

  using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title