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EP-4742522-A1 - POWER CONVERSION DEVICE

EP4742522A1EP 4742522 A1EP4742522 A1EP 4742522A1EP-4742522-A1

Abstract

A power conversion apparatus according to an embodiment disclosed herein includes a first switch and a second switch serially connected at a first node, a third switch and a fourth switch connected to the first switch at a second node, a fifth switch connected to the third switch at a third node, a sixth switch connected to the fifth switch at a fourth node, a seventh switch and an eighth switch connected to the fifth switch at a fifth node, a ninth switch connected to the eighth switch at a sixth node, a tenth switch connected to the seventh switch at a seventh node, an eleventh switch connected to the tenth switch at an eighth node, and a transformer connected to the first node, the fourth node, the sixth node, and the eighth node, in which the first switch, the second switch, the fifth switch, and the sixth switch are switches for primary-side power conversion, and the eighth switch, the ninth switch, the tenth switch, and the eleventh switch are switches for secondary-side power conversion.

Inventors

  • JEONG, DOO HO

Assignees

  • LG Energy Solution, Ltd.

Dates

Publication Date
20260513
Application Date
20240703

Claims (13)

  1. A power conversion apparatus comprising: a first switch and a second switch serially connected at a first node; a third switch and a fourth switch connected to the first switch at a second node; a fifth switch connected to the third switch at a third node; a sixth switch connected to the fifth switch at a fourth node; a seventh switch and an eighth switch connected to the fifth switch at a fifth node; a ninth switch connected to the eighth switch at a sixth node; a tenth switch connected to the seventh switch at a seventh node; an eleventh switch connected to the tenth switch at an eighth node; and a transformer connected to the first node, the fourth node, the sixth node, and the eighth node, wherein the first switch, the second switch, the fifth switch, and the sixth switch are switches for primary-side power conversion, and the eighth switch, the ninth switch, the tenth switch, and the eleventh switch are switches for secondary-side power conversion.
  2. The power conversion apparatus of claim 1, wherein the second node is a node to which voltage is input, and the third node and the seventh node are nodes from which voltage is output, and the second switch, the sixth switch, the ninth switch, and the eleventh switch are connected to ground.
  3. The power conversion apparatus of claim 1, further comprising a controller configured to control operations of the first switch to the eleventh switch, wherein the controller is further configured to control the third switch and the seventh switch to be turned on and the fourth switch to be turned off, when all of the switches for primary-side power conversion and the switches for secondary-side power conversion are normal.
  4. The power conversion apparatus of claim 3, wherein the controller is further configured to control the third switch and the seventh switch to be turned off and the fourth switch to be turned on, when at least any one of the switches for primary-side power conversion is abnormal.
  5. The power conversion apparatus of claim 3, wherein the controller is further configured to control the third switch, the fourth switch, and the seventh switch to be turned off, when at least any one of the switches for secondary-side power conversion is abnormal.
  6. The power conversion apparatus of claim 1, wherein the third node and the seventh node are nodes from which voltage is output, voltage is output through the seventh node when all of the switches for secondary-side power conversion are normal, and voltage is output through the third node when at least any one of the switches for secondary-side power conversion is abnormal.
  7. The power conversion apparatus of claim 1, further comprising a twelfth switch that connects the third node to the seventh node, wherein it is determined whether voltage is to be output to the third node or the seventh node through an operation of the twelfth switch.
  8. A power conversion apparatus comprising: a primary-side power conversion apparatus comprising a thirteenth switch; and a secondary-side power conversion apparatus connected to the primary-side power conversion apparatus through a transformer and comprising a fourteenth switch, wherein the primary-side power conversion apparatus and the secondary-side power conversion apparatus are connected to the transformer through a fifteenth switch in different lines, and the thirteenth switch, the fourteenth switch, and the fifteenth switch operate based on whether the primary-side power conversion apparatus and the secondary-side power conversion apparatus are abnormal.
  9. The power conversion apparatus of claim 8, further comprising a controller configured to control operations of the thirteenth switch, the fourteenth switch, and the fifteenth switch, wherein the controller is further configured to control the thirteenth switch and the fourteenth switch to be turned on and the fifteenth switch to be turned off, when both the primary-side power conversion apparatus and the secondary-side power conversion apparatus are normal.
  10. The power conversion apparatus of claim 9, wherein the controller is further configured to control the thirteenth switch and the fourteenth switch to be turned off and the fifteenth switch to be turned on, when the primary-side power conversion apparatus is abnormal.
  11. The power conversion apparatus of claim 9, wherein the controller is further configured to control the thirteenth switch, the fourteenth switch, and the fifteenth switch to be turned off, when the secondary-side power conversion apparatus is abnormal.
  12. The power conversion apparatus of claim 8, wherein voltage is output from the primary-side power conversion apparatus when the secondary-side power conversion apparatus is abnormal, and voltage is output from the secondary-side power conversion apparatus when the secondary-side power conversion apparatus is normal.
  13. The power conversion apparatus of claim 8, wherein the primary-side power conversion apparatus, the secondary-side power conversion apparatus, and the transformer operate with a dual active bridge power topology, and the power conversion apparatus operates with the 4-switch buck boost topology through operations of the thirteenth switch, the fourteenth switch, and the fifteenth switch when any one of the primary-side power conversion apparatus or the secondary-side power conversion apparatus is abnormal.

Description

[TECHNICAL FIELD] CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0107217 filed in the Korean Intellectual Property Office on August 16, 2023, the entire content of which is incorporated herein by reference. TECHNICAL FIELD Embodiments disclosed herein relate to a power conversion apparatus and an operating method thereof. [BACKGROUND ART] Recently, research and development of secondary batteries have been actively performed. Herein, the secondary batteries, which are chargeable/dischargeable batteries, may include all of conventional nickel (Ni)/cadmium (Cd) batteries, Ni/metal hydride (MH) batteries, etc., and recent lithium-ion batteries. Among the secondary batteries, a lithium-ion battery has a much higher energy density than those of the conventional Ni/Cd batteries, Ni/MH batteries, etc. Moreover, the lithium-ion battery may be manufactured to be small and lightweight, such that the lithium-ion battery has been used as a power source of mobile devices, and recently, a use range thereof has been extended to power sources for electric vehicles, attracting attention as next-generation energy storage media. To stably supply power to batteries or power of batteries to other devices, power conversion apparatuses are required. In case of a failure of a power conversion apparatus, conventionally, two power conversion apparatuses are connected in parallel such that when one of them has a failure, the other power conversion apparatus supplies power. In this case, two power conversion apparatuses are used, increasing cost and securing an additional mounting space. [DISCLOSURE] [TECHNICAL PROBLEM] Embodiments disclosed herein aim to provide a power conversion apparatus in which in case of an internal failure of one power conversion apparatus, bypass power may be supplied by changing an internal power topology, thereby stably supplying power. Technical problems of the embodiments disclosed herein are not limited to the above-described technical problems, and other unmentioned technical problems would be clearly understood by one of ordinary skill in the art from the following description. [TECHNICAL SOLUTION] A power conversion apparatus according to an embodiment disclosed herein includes a first switch and a second switch serially connected at a first node, a third switch and a fourth switch connected to the first switch at a second node, a fifth switch connected to the third switch at a third node, a sixth switch connected to the fifth switch at a fourth node, a seventh switch and an eighth switch connected to the fifth switch at a fifth node, a ninth switch connected to the eighth switch at a sixth node, a tenth switch connected to the seventh switch at a seventh node, an eleventh switch connected to the tenth switch at an eighth node, and a transformer connected to the first node, the fourth node, the sixth node, and the eighth node, in which the first switch, the second switch, the fifth switch, and the sixth switch are switches for primary-side power conversion, and the eighth switch, the ninth switch, the tenth switch, and the eleventh switch are switches for secondary-side power conversion. In an embodiment, the second node may be a node to which voltage is input, and the third node and the seventh node are nodes from which voltage is output, and the second switch, the sixth switch, the ninth switch, and the eleventh switch may be connected to ground. In an embodiment, the power conversion apparatus may further include a controller configured to control operations of the first switch to the eighth switch, in which the controller is further configured to control the third switch and the seventh switch to be turned on and the fourth switch to be turned off, when all of the switches for primary-side power conversion and the switches for secondary-side power conversion are normal. In an embodiment, the controller may be further configured to control the third switch and the seventh switch to be turned off and the fourth switch to be turned on, when at least any one of the switches for primary-side power conversion is abnormal. In an embodiment, the controller may be further configured to control the third switch, the fourth switch, and the seventh switch to be turned off, when at least any one of the switches for secondary-side power conversion is abnormal. In an embodiment, the third node and the seventh node may be nodes from which voltage is output, voltage may be output through the seventh node when all of the switches for secondary-side power conversion are normal, and voltage may be output through the third node when at least any one of the switches for secondary-side power conversion is abnormal. In an embodiment, the power conversion apparatus may further include a twelfth switch that connects the third node to the seventh node, in which it is determined whether voltage is to be output to the third node or the seventh