Power conversion device

Abstract

A power conversion device according to one embodiment disclosed in the present document comprises: a first switch and a second switch connected in series 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 may be switches for primary-side power conversion, and the eighth switch, the ninth switch, the tenth switch and the eleventh switch may be switches for secondary-side power conversion.

Description

power conversion device

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Republic of Korea Patent Application No. 10-2023-0107217, filed August 16, 2023, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The embodiments disclosed in this document relate to a power conversion device and a method of operating the same.

[0005] Recently, research and development on secondary batteries has been actively conducted. Here, secondary batteries are rechargeable and include both conventional Ni / Cd and Ni / MH batteries, as well as recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of having a much higher energy density than conventional Ni / Cd and Ni / MH batteries. Furthermore, lithium-ion batteries can be manufactured in a compact and lightweight form, making them suitable for use as power sources for mobile devices. Recently, their use has expanded to include power sources for electric vehicles, attracting attention as a next-generation energy storage medium.

[0006] A power conversion device is required to provide a stable power supply to a battery or to transfer power from the battery to other devices. To protect against power conversion device failure, two power conversion devices were conventionally connected in parallel, with the remaining device supplying power in the event of a failure. This approach, however, required two power conversion devices, resulting in increased costs and the need for additional installation space.

[0007] One purpose of the embodiments disclosed in this document is to provide a power conversion device capable of supplying stable power by supplying bypass power through changing the internal power topology when an internal failure occurs in a single power conversion device.

[0008] The technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the descriptions below.

[0009] A power conversion device according to one embodiment disclosed in the present document includes a first switch and a second switch connected in series at a first node, a third switch and a fourth switch connected to the first switch and the second node, a fifth switch connected to the third switch and the third node, a sixth switch connected to the fifth switch and the fourth node, a seventh switch and an eighth switch connected to the fifth switch and the fifth node, a ninth switch connected to the eighth switch and the sixth node, a tenth switch connected to the seventh switch and the seventh node, an eleventh switch connected to the tenth switch and the 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 may be switches for primary-side power conversion, and the eighth switch, the ninth switch, the tenth switch, and the eleventh switch may be switches for secondary-side power conversion.

[0010] In one embodiment, the second node is a node that receives voltage, the third node and the seventh node are nodes that output voltage, and the second switch, the sixth switch, the ninth switch, and the eleventh switch can be connected to ground.

[0011] In one embodiment, the device further includes a controller that controls the operation of the first switch to the eleventh switch, and the controller can control the third switch and the seventh switch to be in an on state and the fourth switch to be in an off state when both the switch for the primary power conversion and the switch for the secondary power conversion are normal.

[0012] In one embodiment, the controller can control the third switch and the seventh switch to be turned off and the fourth switch to be turned on when an abnormality occurs in at least one of the switches for the primary power conversion.

[0013] In one embodiment, the controller can control the third switch, the fourth switch, and the seventh switch to be turned off when an abnormality occurs in at least one of the switches for the secondary power conversion.

[0014] In one embodiment, the third node and the seventh node are nodes from which voltage is output, and if all switches for the secondary power conversion are normal, voltage can be output through the seventh node, and if at least one of the switches for the secondary power conversion is abnormal, voltage can be output through the third node.

[0015] In one embodiment, the device further includes a twelfth switch connecting the third node and the seventh node, and whether voltage is output to the third node or the seventh node can be determined through the operation of the twelfth switch.

[0016] A power conversion device according to one embodiment disclosed in the present document includes a primary power conversion device including a 13th switch, and a secondary power conversion device connected to the primary power conversion device through a transformer and a 14th switch, wherein the primary power conversion device and the secondary power conversion device are connected to the transformer through a different line through a 15th switch, and the 13th switch, the 14th switch, and the 15th switch can be operated based on whether an abnormality occurs in the primary power conversion device and the secondary power conversion device.

[0017] In one embodiment, the device further includes a controller that controls the operations of the 13th switch, the 14th switch, and the 15th switch, wherein the controller can control the 13th switch and the 14th switch to be in an on state and control the 15th switch to be in an off state when both the primary power conversion device and the secondary power conversion device are normal.

[0018] In one embodiment, when an abnormality occurs in the primary power conversion device, the controller can control the 13th switch and the 14th switch to be turned off, and control the 15th switch to be turned on.

[0019] In one embodiment, the controller can control the 13th switch, the 14th switch, and the 15th switch to be turned off when an abnormality occurs in the secondary power conversion device.

[0020] In one embodiment, when an abnormality occurs in the secondary power conversion device, a voltage can be output from the primary power conversion device, and when the secondary power conversion device is normal, a voltage can be output from the secondary power conversion device.

[0021] In one embodiment, the primary power conversion device, the secondary power conversion device, and the transformer operate in a dual active bridge power topology, and when an abnormality occurs in either the primary power conversion device or the secondary power conversion device, the primary power conversion device can operate in a 4-switch buck boost topology through the operation of the 13th switch, the 14th switch, and the 15th switch.

[0022] A power conversion device according to an embodiment disclosed in this document can provide a stable power supply by bypassing various fault situations that may occur during operation, and can provide an increase in freedom in terms of cost and mounting space.

[0023] In addition, the power conversion device according to one embodiment disclosed in this document can supply power through a bypass by changing to a 4-switch buck-boost topology when an internal fault occurs in a dual active bridge power topology.

[0024] In addition, various effects may be provided, either directly or indirectly, through this document.

[0025] Figure 1 is a drawing showing the configuration of a conventional power conversion device.

[0026] FIG. 2 is a drawing showing a power conversion device according to one embodiment disclosed in this document.

[0027] FIG. 3 and FIG. 4 are diagrams showing examples of a power conversion device supplying power by bypass according to one embodiment disclosed in this document.

[0028] FIG. 5 is a block diagram showing a power conversion device according to one embodiment disclosed in this document.

[0029] FIG. 6 is a block diagram showing the hardware configuration of a computing system for performing an operating method of a power conversion device according to one embodiment disclosed in this document.

[0030] Hereinafter, embodiments disclosed in this document will be described in detail with reference to exemplary drawings. When designating components in each drawing, it should be noted that, where possible, identical components are given the same reference numerals, even if they appear in different drawings. Furthermore, when describing embodiments disclosed in this document, detailed descriptions of related known structures or functions will be omitted if they are deemed to hinder understanding of the embodiments disclosed in this document.

[0031] In describing the components of the embodiments disclosed in this document, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components and do not limit the nature, order, or sequence of the components. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed in this document belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this application.

[0032] Figure 1 is a drawing showing the configuration of a conventional power conversion device.

[0033] Referring to FIG. 1, a conventional power conversion device may include a dual active bridge power topology (110). For example, the dual active bridge power topology (110) may include eight switches and may include a transformer.

[0034] The dual active bridge power topology (110) can operate in a structure in which voltage is input from the primary side and voltage is output from the secondary side.

[0035] According to an embodiment, the dual active bridge power topology (110) may be unusable if at least one of the switches included in the dual active bridge power topology (110) fails.

[0036] A 4-Switch Buck Boost topology (120) may include multiple switches (Q1, Q2, Q3, Q3) and an inductor (L1).

[0037] The 4-Switch Buck Boost topology (120) can also receive voltage input and output it.

[0038] Both the dual active bridge power topology (110) and the 4-Switch Buck Boost topology (120) are circuits capable of converting power, and if at least one element, such as a switch or inductor, included in the dual active bridge power topology (110) and the 4-Switch Buck Boost topology (120) fails, there may be a disadvantage in that the entire topology cannot be used.

[0039] FIG. 2 is a drawing showing a power conversion device according to one embodiment disclosed in this document.

[0040] Referring to FIG. 2, a power conversion device (200) according to one embodiment disclosed in the present document may include a plurality of switches (S1 to S11) and a transformer (230). According to an embodiment, the power conversion device (200) may further include a controller (240).

[0041] The first switch (S1) and the second switch (S2) can be connected in series at the first node (N1).

[0042] The third switch (S3) and the fourth switch (S4) can be connected to the first switch (S1) and the second node (N2). For example, the third switch (S3) and the fourth switch (S4) can be connected in parallel with each other.

[0043] The fifth switch (S5) can be connected to the third switch (S3) and the third node (N3).

[0044] The sixth switch (S6) can be connected to the fifth switch (S5) and the fourth node (N4).

[0045] The seventh switch (S7) and the eighth switch (S8) can be connected to the fifth switch (S5) and the fifth node (N5). For example, the seventh switch (S7) and the eighth switch (S8) can be connected in parallel with each other.

[0046] The ninth switch (S9) can be connected to the eighth switch (S8) and the sixth node (N6).

[0047] The 10th switch (S10) can be connected to the 7th switch (S7) and the 7th node (N7).

[0048] The 11th switch (S11) can be connected to the 10th switch (S10) and the 8th node (N8).

[0049] According to an embodiment, one end of the second switch (S2), the sixth switch (S6), the ninth switch (S9) and the eleventh switch (S11) can be connected to ground.

[0050] According to an embodiment, the power conversion device (200) may include a transformer (230) connected to a first node (N1), a fourth node (N4), a sixth node (N6), and an eighth node (N8). The transformer (230) may perform the same operation as a transformer of a known technology.

[0051] According to an embodiment, the first switch (S1), the second switch (S2), the fifth switch (S5) and the sixth switch (S6) may be switches (210) for primary side power conversion.

[0052] According to an embodiment, the eighth switch (S8), the ninth switch (S9), the tenth switch (S10) and the eleventh switch (S11) may be switches (220) for secondary power conversion.

[0053] According to an embodiment, the first switch (S1) to the eleventh switch (S11) may include a MOSFET or a BJT.

[0054] According to an embodiment, the second node (N2) may be a node that receives voltage input, and the third node (N3) and the seventh node (N7) may be nodes that output voltage. For example, the voltage may be output from only one of the third node (N3) and the seventh node (N7).

[0055] The controller (240) can control the operation of the first switch (S1) to the eleventh switch (S11). For example, the controller (240) can control the operation of the first switch (S1) to the eleventh switch (S11) to convert power, determine which node to output voltage through, and control each of the first switch (S1) to the eleventh switch (S11) to allow current to flow by bypassing if at least one of the first switch (S1) to the eleventh switch (S11) is faulty.

[0056] According to an embodiment, when both the switch (210) for primary power conversion and the switch (220) for secondary power conversion are normal, the controller (240) can control the third switch (S3) and the seventh switch (S7) to be in an on state and control the fourth switch (S4) to be in an off state. That is, in this case, when voltage is input through the second node (N2), since the fourth switch (S4) is off, current does not flow toward the fourth switch (S4), so that power can be converted in the form of a dual active bridge topology. According to an embodiment, when both the switch (210) for primary power conversion and the switch (220) for secondary power conversion are normal, voltage can be output from the seventh node (N7). In this case, the controller (240) can control the remaining switches except for the third switch (S3), the fourth switch (S4), and the seventh switch (S7) to convert power in a dual active bridge topology.

[0057] According to an embodiment, when an abnormality occurs in at least one of the switches (210) for primary power conversion, the controller (240) can control the third switch (S3) and the seventh switch (S7) to be turned off, and control the fourth switch (S4) to be turned on.

[0058] According to an embodiment, the controller (240) can control the third switch (S3), the fourth switch (S4), and the seventh switch (S7) to be turned off when an abnormality occurs in at least one of the switches (220) for secondary power conversion.

[0059] FIG. 3 and FIG. 4 are diagrams showing examples of a power conversion device supplying power by bypass according to one embodiment disclosed in this document.

[0060] Referring to FIG. 3, when an abnormality occurs in at least one of the switches (220) for secondary power conversion, the controller (240) can control the third switch (S3), the fourth switch (S4), and the seventh switch (S7) to be turned off.

[0061] In this case, when voltage is input to the second node (N2), the current cannot flow to the third switch (S3) or the fourth switch (S4), but can flow to the first node (N1) through the first switch (S1), and then to the fourth node (N4) through the transformer (230). In addition, the current can flow from the fourth node (N4) through the fifth switch (S5) and be output through the third node (N3). That is, when the third switch (S3), the fourth switch (S4), and the seventh switch (S7) are in the off state, the power conversion device (200) can operate in a 4-switch buck-boost topology. In this case, the controller (240) can control the first switch (S1), the second switch (S2), the fifth switch (S5), and the sixth switch (S6) to operate in a 4-switch buck-boost topology. In addition, since the seventh switch (S7) is in an off state and the eighth switch (S8) to the eleventh switch (S11) are controlled not to operate, current may not flow to the switch (220) for secondary power conversion, and therefore, current may not be transmitted to the switch (220) for secondary power conversion through the transformer (230).

[0062] Referring to FIG. 4, when an abnormality occurs in at least one of the switches (210) for primary power conversion, the controller (240) can control the third switch (S3) and the seventh switch (S7) to be turned off, and control the fourth switch (S4) to be turned on.

[0063] In this case, when voltage is input to the second node (N2), current may flow to the fourth switch instead of the third switch (S3). The controller (240) may control the first switch (S1), the second switch (S2), the fifth switch (S5), and the sixth switch (S6) not to operate.

[0064] The current flowing to the fifth node (N5) through the fourth switch (S4) can flow to the eighth switch (S8) because the seventh switch (S7) is in the off state. The current can flow from the sixth node (N6) to the eighth node (N8) through the transformer (230) and be output from the seventh node (N7) through the tenth switch (S10). That is, when the third switch (S3) and the seventh switch (S7) are in the off state and the fourth switch (S4) is in the on state, the power conversion device (200) can operate in a four-switch buck-boost topology. In this case, the controller (240) can control the eighth switch (S8), the ninth switch (S9), the tenth switch (S10), and the eleventh switch (S11) to operate in the four-switch buck-boost topology.

[0065] That is, the power conversion device (200) according to one embodiment disclosed in this document can control the switch (220) for secondary power conversion to operate in a 4-switch buck-boost topology when at least one of the switches (210) for primary power conversion fails, and can control the switch (210) for primary power conversion to operate in a 4-switch buck-boost topology when at least one of the switches (220) for secondary power conversion fails, thereby preparing for switch failure.

[0066] Referring back to FIG. 2, the third node (N3) and the seventh node (N7) may be nodes from which voltage is output. For example, the power conversion device (200) may output voltage through the seventh node (N7) if all switches (220) for secondary power conversion are normal, and may output voltage through the third node (N3) if at least one of the switches (220) for secondary power conversion is abnormal.

[0067] According to an embodiment, the power conversion device (200) may further include a 12th switch (not shown) connecting the third node (N3) and the seventh node (N7), and whether voltage is output to the third node (N3) or the seventh node (N7) may be determined through the operation of the 12th switch. For example, the controller (240) of the power conversion device (200) may control the operation of the 12th switch, and if all switches (220) for secondary-side power conversion are normal, the controller (240) of the power conversion device (200) may control the 12th switch to be turned off so that voltage may be output through the seventh node (N7). As another example, if an abnormality occurs in at least one of the switches (220) for secondary-side power conversion, the controller (240) of the power conversion device (200) may control the 12th switch to be turned on so that the output of the third node (N3) may be output through the seventh node (N7).

[0068] The power conversion device (200) according to one embodiment disclosed in this document can provide a stable power supply by bypassing various failure situations that may occur during operation, and can provide an increase in freedom in terms of cost and mounting space.

[0069] In addition, the power conversion device (200) according to one embodiment disclosed in this document can supply power through a bypass by changing to a 4-switch buck-boost topology when an internal fault occurs in a dual active bridge power topology.

[0070] FIG. 5 is a block diagram showing a power conversion device according to one embodiment disclosed in this document.

[0071] Referring to FIG. 5, a power conversion device (500) according to one embodiment disclosed in the present document may include a primary power conversion device (510), a secondary power conversion device (520), and a transformer (530). According to an embodiment, the power conversion device (500) may further include a controller (540).

[0072] The primary power conversion device (510) may include a 13th switch (S13). For example, the primary power conversion device (510) may further include a plurality of switches other than the 13th switch (S13).

[0073] The secondary power conversion device (520) may include a fourteenth switch (S14). For example, the secondary power conversion device (520) may further include a plurality of switches other than the fourteenth switch (S14).

[0074] The primary power conversion device (510) and the secondary power conversion device (520) may be connected through a transformer (530). In addition, the primary power conversion device (510) and the secondary power conversion device (520) may be connected through a 15th switch (S15) with a different line from the transformer (530).

[0075] The 13th switch (S13), the 14th switch (S14), and the 15th switch (S15) may be operated based on whether an abnormality occurs in the primary power conversion device (510) and the secondary power conversion device (520). For example, the controller (540) may control the 13th switch (S13), the 14th switch (S14), and the 15th switch (S15). According to an embodiment, the controller (540) may control the operations of the primary power conversion device (510) and the secondary power conversion device (520).

[0076] According to an embodiment, the controller (540) can control the 13th switch (S13) and the 14th switch (S14) to be in an on state and the 15th switch (S15) to be in an off state when both the primary power conversion device (510) and the secondary power conversion device (520) are normal.

[0077] According to an embodiment, when an abnormality occurs in the primary power conversion device (510), the controller (540) can control the 13th switch (S13) and the 14th switch (S14) to be turned off, and control the 15th switch (S15) to be turned on. For example, when an abnormality occurs in the primary power conversion device (510), the controller (540) can control the 13th switch (S13) to be turned off so that current does not flow in the primary power conversion device (510), and control the current to flow through the 15th switch (S15) and the secondary power conversion device (520).

[0078] According to an embodiment, when an abnormality occurs in the secondary power conversion device (520), the controller (540) can control the 13th switch (S13), the 14th switch (S14), and the 15th switch (S15) to be turned off. For example, when an abnormality occurs in the secondary power conversion device (520), the controller (540) can control the 14th switch (S14) and the 15th switch (S15) to be turned off, thereby preventing current from flowing in the secondary power conversion device (520) and allowing current to flow in the primary power conversion device (510).

[0079] According to an embodiment, the power conversion device (500) can output voltage from the primary power conversion device (510) when an abnormality occurs in the secondary power conversion device (520), and can output voltage from the secondary power conversion device (520) when the secondary power conversion device (520) is normal.

[0080] According to an embodiment, the primary power conversion device (510), the secondary power conversion device (520), and the transformer (530) may operate in a dual active bridge power topology. For example, the controller (540) may control the primary power conversion device (510), the secondary power conversion device (520), and the transformer (530) to operate in a dual active bridge power topology when no abnormalities occur in the primary power conversion device (510) and the secondary power conversion device (520).

[0081] According to an embodiment, when an abnormality occurs in either the primary power conversion device (510) or the secondary power conversion device (520), the power conversion device (500) can be operated in a 4-switch buck boost topology through the operations of the 13th switch (S13), the 14th switch (S14), and the 15th switch (S15). For example, when an abnormality occurs in the primary power conversion device (510), the controller (540) can control the secondary power conversion device (520) to operate in a 4-switch buck boost topology, and when an abnormality occurs in the secondary power conversion device (520), the controller can control the primary power conversion device (510) to operate in a 4-switch buck boost topology.

[0082] FIG. 6 is a block diagram showing the hardware configuration of a computing system for performing an operating method of a power conversion device according to one embodiment disclosed in this document.

[0083] FIG. 6 is a block diagram showing the hardware configuration of a computing system for performing an operating method of a power conversion device according to one embodiment disclosed in this document.

[0084] Referring to FIG. 6, a computing system (2000) according to one embodiment disclosed in this document may include an MCU (2100), a memory (2200), an input / output I / F (2300), and a communication I / F (2400).

[0085] The MCU (2100) may be a processor that executes various programs stored in the memory (2200) (e.g., a switch operation control program, a power conversion device control program, a switch abnormality determination program, etc.), processes various information including the operation of the switch and the occurrence of a switch abnormality through these programs, and performs the functions of the controller included in the power conversion device shown in the aforementioned FIG. 2.

[0086] The memory (2200) can store various programs, such as a switch operation control program, a power conversion device control program, and a program for determining whether a switch malfunction has occurred. In addition, the memory (2200) can store various information, including the operation of the switch and whether a switch malfunction has occurred.

[0087] Such memories (2200) may be provided in multiple numbers as needed. The memories (2200) may be volatile memories or non-volatile memories. As volatile memories (2200), RAM, DRAM, SRAM, etc. may be used. As non-volatile memories (2200), ROM, PROM, EAROM, EPROM, EEPROM, flash memories, etc. may be used. The examples of the memories (2200) listed above are merely examples and are not limited to these examples.

[0088] The input / output I / F (2300) can provide an interface that enables data transmission and reception between an input device (not shown) such as a keyboard, mouse, or touch panel, and an output device (not shown) such as a display and the MCU (2100).

[0089] The communication I / F (2400) is a component capable of transmitting and receiving various data with the server, and may be any device capable of supporting wired or wireless communication. For example, a power conversion device can transmit and receive various information, including switch operation and switch malfunctions, from a separately provided external server via the communication I / F (2400).

[0090] In this way, a computer program according to one embodiment disclosed in this document may be implemented as a module that is recorded in a memory (2200) and processed by an MCU (2100) to perform each function illustrated in FIG. 2, for example.

[0091] The above description is merely an example of the technical idea disclosed in this document, and those skilled in the art to which the embodiments disclosed in this document pertain may make various modifications and variations without departing from the essential characteristics of the embodiments disclosed in this document.

[0092] Accordingly, the embodiments disclosed in this document are intended to illustrate, rather than limit, the technical concepts disclosed in this document, and the scope of the technical concepts disclosed in this document is not limited by these embodiments. The scope of protection of the technical concepts disclosed in this document should be interpreted by the claims below, and all technical concepts within the equivalent scope should be interpreted as being included within the scope of the rights of this document.

[0093] [Explanation of symbols]

[0094] 110: Dual Active Bridge Power Topology

[0095] 120: 4-switch Buck Boost topology

[0096] 200: Power conversion device

[0097] 210: Switch for primary power conversion

[0098] 220: Switch for secondary power conversion

[0099] 230: Transformers

[0100] 240: Controller

[0101] 500: Power conversion device

[0102] 510: Primary power conversion device

[0103] 520: Secondary power conversion device

[0104] 530: Transformers

[0105] 540: Controller

[0106] 2000: Computing Systems

[0107] 2100: MCU

[0108] 2200: Memory

[0109] 2300: Input / Output I / F

[0110] 2400: Communication I / F

Claims

1. A first switch and a second switch connected in series at the first node; A third switch and a fourth switch connected to the first switch and the second node; A fifth switch connected to the third switch and the third node; A sixth switch connected to the fifth switch and the fourth node; A seventh switch and an eighth switch connected to the fifth switch and the fifth node; A ninth switch connected to the eighth switch and the sixth node; A tenth switch connected to the seventh switch and the seventh node; An 11th switch connected to the 10th switch and the 8th node; and Including a transformer connected to the first node, the fourth node, the sixth node and the eighth node, The above first switch, the above second switch, the above fifth switch, and the above sixth switch are switches for primary side power conversion, A power conversion device, wherein the above-mentioned eighth switch, the above-mentioned ninth switch, the above-mentioned tenth switch, and the above-mentioned eleventh switch are switches for secondary-side power conversion.

2. In paragraph 1, The second node is a node that receives voltage, and the third node and the seventh node are nodes that output voltage. A power conversion device, wherein the second switch, the sixth switch, the ninth switch and the eleventh switch are connected to ground.

3. In paragraph 1, Further comprising a controller for controlling the operation of the first switch to the eleventh switch; The above controller, A power conversion device, wherein when both the switch for the primary side power conversion and the switch for the secondary side power conversion are normal, the third switch and the seventh switch are controlled to be in an on state, and the fourth switch is controlled to be in an off state.

4. In paragraph 3, The above controller, A power conversion device that controls the third switch and the seventh switch to be turned off and controls the fourth switch to be turned on when an abnormality occurs in at least one of the switches for the primary power conversion.

5. In paragraph 3, The above controller, A power conversion device that controls the third switch, the fourth switch, and the seventh switch to be turned off when an abnormality occurs in at least one of the switches for the secondary power conversion.

6. In paragraph 1, The third node and the seventh node are nodes from which voltage is output, If all the switches for the secondary power conversion are normal, voltage is output through the 7th node. A power conversion device that outputs voltage through the third node when an abnormality occurs in at least one of the switches for the secondary side power conversion.

7. In paragraph 1, Further comprising a 12th switch connecting the third node and the seventh node, A power conversion device in which whether voltage is output to the third node or the seventh node is determined through the operation of the 12th switch.

8. A primary power conversion device including a 13th switch; and A secondary power conversion device connected to the primary power conversion device and the transformer through the 14th switch; The above primary power conversion device and the above secondary power conversion device are connected to the transformer through a 15th switch on a different line, A power conversion device, wherein the 13th switch, the 14th switch, and the 15th switch are operated based on whether an abnormality occurs in the primary power conversion device and the secondary power conversion device.

9. In paragraph 8, Further comprising a controller for controlling the operation of the 13th switch, the 14th switch and the 15th switch; The above controller, A power conversion device, wherein when both the primary power conversion device and the secondary power conversion device are normal, the 13th switch and the 14th switch are controlled to be in an on state, and the 15th switch is controlled to be in an off state.

10. In paragraph 9, The above controller, A power conversion device that, when a problem occurs in the primary power conversion device, controls the 13th switch and the 14th switch to be turned off, and controls the 15th switch to be turned on.

11. In paragraph 9, The above controller, A power conversion device that controls the 13th switch, the 14th switch, and the 15th switch to be turned off when a problem occurs in the secondary power conversion device.

12. In paragraph 8, If a problem occurs in the secondary power conversion device, the primary power conversion device outputs voltage, A power conversion device that outputs voltage from the secondary power conversion device when the secondary power conversion device is normal.

13. In paragraph 8, The above primary power conversion device, the secondary power conversion device and the transformer are operated in a dual active bridge power topology, A power conversion device that operates in a 4-switch Buck Boost topology through the operations of the 13th switch, the 14th switch, and the 15th switch when an abnormality occurs in either the primary power conversion device or the secondary power conversion device.

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