Power conversion device

Abstract

An embodiment discloses a power conversion device comprising: a first power conversion unit including a first inductor, a second inductor, and a first switch unit; a first connection unit and a second connection unit which are connected to the first power conversion unit; and a second power conversion unit connected to the first connection unit and the second connection unit, wherein the first inductor is connected to the first connection unit, and the second inductor is connected to the second connection unit.

Description

power conversion device

[0001] The embodiment relates to a power conversion device.

[0002] Recently, interest in electric vehicle rapid chargers, energy storage systems (ESS), and solar power generation has been growing. Power conversion devices used in conjunction with batteries in these applications require a wide output voltage range to accommodate a wide range of battery voltages. Furthermore, these applications require large power capacities, which in turn necessitate high currents. Consequently, the development of power conversion devices with a wide output voltage range is essential.

[0003] Conventional power conversion circuits have problems such as high voltage and current stress and difficulty in securing input and output voltage gain.

[0004] The embodiment provides a power conversion device having a wide output voltage range.

[0005] Additionally, a power conversion device having a wide output current range is provided.

[0006] Additionally, a power conversion device capable of simultaneously expanding the output voltage range or output current range is provided.

[0007] Additionally, a power conversion device capable of maintaining continuous power transmission and expanding the range of output voltage and output current is provided.

[0008] The problem to be solved in the embodiment is not limited to this, and it can be said that the purpose or effect that can be understood from the solution or embodiment of the problem described below is also included.

[0009] A power conversion device according to an embodiment includes a first power conversion unit including a first inductor, a second inductor, and a first switch unit; a first connection unit and a second connection unit connected to the first power conversion unit; and a second power conversion unit connected to the first connection unit and the second connection unit, wherein the first inductor can be connected to the first connection unit, and the second inductor can be connected to the second connection unit.

[0010] The first connecting portion includes a first electrode and a second electrode which are opposite to each other, and the first inductor can be connected to the first electrode or the second electrode.

[0011] The second connecting portion includes the first electrode and the second electrode which are opposite to each other, and the second inductor can be connected to the first electrode or the second electrode.

[0012] The first inductor may be connected between the first connecting portion and the first switch portion, and the second inductor may be connected between the second connecting portion and the first switch portion.

[0013] The first switch section includes a first switch to a third switch, and the second switch can be positioned between the first switch and the third switch.

[0014] The first inductor may be connected between the second switch and the third switch, and the second inductor may be connected between the first switch and the second switch.

[0015] The first switch section further includes a fourth switch, and the fourth switch can be connected to the third switch.

[0016] The first inductor may be connected between the third switch and the fourth switch, and the second inductor may be connected between the first switch and the second switch.

[0017] The second power conversion unit includes a second switching unit, and the second switching unit can transmit power to the first connecting unit and the second connecting unit.

[0018] The second power conversion unit may further include the second switch unit and a third switch unit connected in series or in parallel with the second switch unit.

[0019] The second switch section can transmit power to the first connection section, and the third switch section can transmit power to the second connection section.

[0020] The second power conversion unit may include a third inductor and a first transformer disposed between the second switch unit and the first connection unit.

[0021] The second power conversion unit may include a third inductor and a first transformer disposed between the second switch unit and the first connection unit; and a fourth inductor and a second transformer disposed between the third switch unit and the second connection unit.

[0022] The first inductor may be connected between the first electrode of the first connecting portion and the first switch, and the second inductor may be connected between the second electrode of the second connecting portion and the third switch.

[0023] The second power conversion unit may include a first rectifier circuit and a second rectifier circuit, the first rectifier circuit may be arranged between the first transformer unit and the first connection unit, and the second rectifier circuit may be arranged between the second transformer unit and the second connection unit.

[0024] The first power conversion unit may further include an output unit connected to the first power conversion unit, and the first power conversion unit may include a first storage unit and a second storage unit connected between the first switch unit and the output unit.

[0025] According to an embodiment, a power conversion device having a wide output voltage range can be provided.

[0026] Additionally, a power conversion device having a wide output current range can be provided.

[0027] Additionally, a power conversion device capable of simultaneously expanding the output voltage range or output current range can be provided.

[0028] In addition, a power conversion device capable of maintaining continuous power transmission and expanding the range of output voltage and output current can be provided.

[0029] The various advantageous and beneficial effects of the present invention are not limited to the above-described contents, and will be more easily understood in the course of explaining specific embodiments of the present invention.

[0030] Fig. 1 is a block diagram of a power conversion device according to an embodiment;

[0031] Fig. 2 is a block diagram of a first power conversion unit according to an embodiment;

[0032] Fig. 3 is a circuit diagram of an inductor according to an embodiment,

[0033] Figures 4 and 5 are circuit diagrams of a first switch unit according to an embodiment,

[0034] Figures 6a to 6d are circuit diagrams of a first power conversion unit according to an embodiment,

[0035] Figures 7a to 7d are circuit diagrams of a first power conversion unit according to another embodiment,

[0036] Figures 8a to 8c are block diagrams of a second power conversion unit according to an embodiment.

[0037] FIGS. 9A to 9C and FIGS. 10A and 10B are circuit diagrams of a second switch unit according to an embodiment.

[0038] FIGS. 11A to 11C, 12A to 12C, and 13A to 13C are circuit diagrams of a second switch unit and a third switch unit according to an embodiment.

[0039] Fig. 14 is a circuit diagram of a transformer according to an embodiment.

[0040] Figures 15a to 15d are circuit diagrams of a power conversion device according to an embodiment,

[0041] Figures 16a and 16b are circuit diagrams showing a case where the power conversion device is in the first mode.

[0042] Figures 17a and 17b are circuit diagrams showing a case where the power conversion device is in the second mode.

[0043] Figures 18a to 18c are images showing the operation of each switch when the power conversion device is in the third mode.

[0044] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0045] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0046] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0047] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0048] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0049] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0050] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0051] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0052] Additionally, when described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below", it can include the meaning of a downward direction as well as an upward direction based on one component.

[0053] Fig. 1 is a block diagram of a power conversion device according to an embodiment.

[0054] Referring to FIG. 1, a power conversion device (1000) according to an embodiment may include a first power conversion unit (1100), a second power conversion unit (1200), a first connection unit (1300), a second connection unit (1400), an input unit (1500), and an output unit (1600).

[0055] The power conversion device (1000) can receive power, convert it, and output it. The power conversion device (1000) can convert the voltage or current of the input power and output it. The power conversion device (1000) can convert direct current (DC) into direct current (DC). The power conversion device (1000) can convert the voltage of the DC to lower or increase it.

[0056] The power conversion device (1000) can receive a direct current voltage through the input unit (1500). The input voltage can reach the first power conversion unit (1100) through the first and second connection units (1300, 1400) via the second power conversion unit (1200), and can be output from the first power conversion unit (1100) through the output unit (1600). The direction of the current passing through the power conversion device (1000) is not limited, and for example, it can be input to the first power conversion unit (1100), passed through the first and second connection units (1300, 1400), and output through the second power conversion unit (1200).

[0057] Fig. 2 is a block diagram of a first power conversion unit according to an embodiment.

[0058] Referring to FIGS. 1 and 2, a power conversion device (1000) according to an embodiment may include a first power conversion unit (1100). The first power conversion unit (1100) may include a first inductor (1110), a second inductor (1120), and a first switch unit (1130). The first power conversion unit (1100) may receive power from a first connection unit (1300) and a second connection unit (1400) and convert voltage or current. The first power conversion unit (1100) may convert power and output it through an output unit (1600). The first power conversion unit (1100) may include a non-isolated power conversion circuit that receives power and generates a single output. In addition, the power transmission direction of the first power conversion unit (1100) is not limited to the forward direction, and may be used in both directions or in the reverse direction.

[0059] A power conversion device (1000) according to an embodiment may include a first connection unit (1300) and a second connection unit (1400). The first connection unit (1300) and the second connection unit (1400) may be disposed between a first power conversion unit (1100) and a second power conversion unit (1200). The first connection unit (1300) and the second connection unit (1400) may be disposed between the first power conversion unit (1100) and the second power conversion unit (1200) and may be electrically connected to the first power conversion unit (1100) and the second power conversion unit (1200). The first connection unit (1300) and the second connection unit (1400) may receive power from the second power conversion unit (1200) and transmit it to the first power conversion unit (1100). In addition, the first connecting portion (1300) and the second connecting portion (1400) can receive power from the first power conversion portion (1100) and transmit it to the second power conversion portion (1200). The first connecting portion (1300) and the second connecting portion (1400) can each include a first electrode (+) and a second electrode (-). The first electrode (+) and the second electrode (-) can have opposite polarities. The first electrode (+) of the first connecting portion (1300) can be connected to point a of the first switch portion (1130) through the first inductor (1110). The second electrode (-) of the first connecting portion (1300) can be connected to point c of the first switch portion (1130) through the first inductor (1110). The first electrode (+) of the second connecting portion (1400) can be connected to point b of the first switch portion (1130) through the second inductor (1120). The second electrode (-) of the second connecting portion (1400) can be connected to point d of the first switch portion (1130) through the second inductor (1120).

[0060] A capacitor (Capacitor, C) may be connected between the first connecting portion (1300) and the second connecting portion (1400) and the first inductor (1110) and the second inductor (1120), respectively. By including the capacitor between the first connecting portion (1300) and the second connecting portion (1400) and the first inductor (1110) and the second inductor (1120), noise and ripple may be reduced. In addition, a capacitor may be connected between the first switching portion (1130) and the output portion (1600). By including the capacitor between the first switching portion (1130) and the output portion (1600), noise and ripple may be reduced.

[0061] Fig. 3 is a circuit diagram of an inductor according to an embodiment.

[0062] Referring to FIGS. 2 and 3, the first power conversion unit (1100) may include a first inductor (1110) and a second inductor (1120). The first inductor (1110) and the second inductor (1120) may generate power according to changes in the flowing current over time. As the changes in the current of the first inductor (1110) and the second inductor (1120) increase, the intensity of the generated power may increase. The first inductor (1110) and the second inductor (1120) may generate power in a direction opposite to the direction of the current. The first inductor (1110) and the second inductor (1120) may each receive separate power supplies.

[0063] The first inductor (1110) may be connected to the first connection unit (1300). The first inductor (1110) may be connected in series with the first connection unit (1300). The first inductor (1110) may be connected to the first connection unit (1300) to generate power according to a change in the current supplied from the first connection unit (1300). In addition, the first inductor (1110) may be connected to the first switch unit (1130). The first inductor (1110) may be electrically connected to the first switch unit (1130) to transmit an output voltage to the first switch unit (1130).

[0064] The second inductor (1120) may be connected to the second connection unit (1400). The second inductor (1120) may be connected in series with the second connection unit (1400). The second inductor (1120) may be connected to the second connection unit (1400) to generate power according to a change in the current supplied from the second connection unit (1400). In addition, the second inductor (1120) may be connected to the first switch unit (1130). The second inductor (1120) may be electrically connected to the first switch unit (1130) to transmit an output voltage to the first switch unit (1130).

[0065] Referring to FIG. 3, the first inductor (1110) and the second inductor (1120) may include a single or multiple inductors.

[0066] Referring to Fig. 3a, the first inductor (1110) and the second inductor (1120) may include two inductors. In this case, the two inductors may be connected to the first pole and the second pole of the connection part, respectively. Referring to Figs. 3b and 3c, the first inductor (1110) and the second inductor (1120) may include one inductor. In this case, the inductor may be connected to the first pole or the second pole of the connection part. Referring to Fig. 3d, the first inductor (1110) and the second inductor (1120) may include a form in which two inductors are combined. In this case, the two inductors may be connected to the first pole and the second pole of the connection part, respectively, and the two inductors may be connected and combined. When the two inductors are combined, there may be an effect of reducing the ripple of the inductor current.

[0067] Figures 4 and 5 are circuit diagrams of a first switch unit according to an embodiment.

[0068] Referring to FIGS. 2, 4, and 5, the first power conversion unit (1100) may include a first switch unit (1130). The first switch unit (1130) may include a plurality of switches to allow or block current to flow. The first switch unit (1130) may allow or block current transmitted from the first inductor (1110) and the second inductor (1120) to be output to the output unit. The first switch unit (1130) may allow current to pass in both directions or only in one direction, depending on the type of the plurality of switches. The plurality of switches may include diodes or semiconductor switches.

[0069] Referring to FIG. 4A, the first switch unit (1130) may include three switches. The first switch unit (1130) may include first to third switches (S1, S2, S3). The first to third switches (S1, S2, S3) may be sequentially connected from point a to point d, and the second switch (S2) may be positioned between the first switch (S1) and the third switch (S3). In addition, the first switch unit (1130) may include multiple connection points (a, b, c, d). A may be a point connected to the first switch (S1). B may be a point connected between the first switch (S1) and the second switch (S2). C may be a point connected between the second switch (S2) and the third switch (S3). D may be a point connected to the third switch (S3). Referring to Fig. 4b, the first switch unit (1130) may include a bidirectional switch. In this case, current may flow from the input unit to the output unit or from the output unit to the input unit. Referring to Fig. 4c, the first switch unit (1130) may include a forward switch. In this case, current may flow from the input unit to the output unit. Referring to Fig. 4d, the first switch unit (1130) may include a reverse switch. In this case, current may flow from the output unit to the input unit. When the first switch unit (1130) includes three switches, namely, the first switch to the third switch (S1, S2, S3), the number of required switches may be reduced.

[0070] Referring to FIG. 5A, the first switch unit (1130) may include four switches. The first switch unit (1130) may include first to fourth switches (S1, S2, S3, S4). The first to fourth switches (S1, S2, S3, S4) may be sequentially connected from point a to point d, the second switch (S2) may be positioned between the first switch (S1) and the third switch (S3), and the third switch (S3) may be positioned between the second switch (S2) and the fourth switch (S4). In addition, the first switch unit (1130) may include a plurality of connection points (a, b, c, d). a may be a point connected to the first switch (S1). b may be a point connected between the first switch (S1) and the second switch (S2). c may be a point connected between the third switch (S3) and the fourth switch (S4). d may be a point connected to the fourth switch (S4). In addition, the first switch unit (1130) may include a first capacitor unit (C1) and a second capacitor unit (C2). The first capacitor unit (C1) may be connected to the first switch (S1) and the second switch (S2), and the second capacitor unit (C2) may be connected to the third switch (S3) and the fourth switch (S4). The first capacitor unit (C1) and the second capacitor unit (C2) may include a capacitor. The first capacitor unit (C1) and the second capacitor unit (C2) may have the effect of suppressing voltage spikes of the first to fourth switches (S1, S2, S3, S4). Referring to Fig. 5b, the first switch unit (1130) may include a bidirectional switch. In this case, current may flow from the input unit to the output unit or from the output unit to the input unit. Referring to Fig. 5c, the first switch unit (1130) may include a forward switch. In this case, current may flow from the input unit to the output unit. Referring to Fig. 5d, the first switch unit (1130) may include a reverse switch.In this case, the current can flow from the output section to the input section. If the first switch section (1130) includes four switches, namely the first switch to the fourth switch (S1, S2, S3, S4), there may be an effect of lowering the withstand voltage of the required switch.

[0071] Figures 6a to 6d are circuit diagrams of a first power conversion unit according to an embodiment.

[0072] Figures 6a to 6d illustrate a case where the first switch unit (1130) includes three switches, namely, the first switch to the third switch (S1, S2, S3). A capacitor (C) may be placed between the first switch unit (1130) and the output unit (1600).

[0073] Referring to FIG. 6A, the first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1300), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1400). In this case, the first inductor (1110) and the second inductor (1120) may each include one inductor. The first inductor (1110) may be connected to a point (c) between the second switch (S2) and the third switch (S3). The second inductor (1120) may be connected to a point (b) between the first switch (S1) and the second switch (S2).

[0074] Referring to FIG. 6B, the first inductor (1110) may be connected to the first electrode (+) of the first connection portion (1300), and the second inductor (1120) may be connected to the second electrode (-) of the second connection portion (1400). In this case, the first inductor (1110) and the second inductor (1120) may each include one inductor. The first inductor (1110) may be connected to a point (a) between the first switch (S1) and the first electrode (+) of the first connection portion (1300). The second inductor (1120) may be connected to a point (d) between the third switch (S3) and the second electrode (-) of the second connection portion (1400).

[0075] Referring to FIG. 6c, the first inductor (1110) and the second inductor (1120) may each include two inductors. The two inductors may be connected to the first pole (+) and the second pole (-) of the first connection portion (1300) and the second connection portion (1400), respectively. In addition, the two inductors of the first inductor (1110) and the two inductors of the second inductor (1120) may be coupled to each other. When the two inductors include a coupled form, there may be an effect of reducing the ripple of the inductor current. One inductor of the first inductor (1110) may be connected to a point (a) between the first switch (S1) and the first electrode (+) of the first connection portion (1300), and the other inductor may be connected to a point (c) between the second switch (S2) and the third switch (S3). In addition, one inductor of the second inductor (1120) may be connected to a point (d) between the third switch (S3) and the second electrode (-) of the second connection portion (1400), and the other inductor may be connected to a point (b) between the first switch (S1) and the second switch (S2).

[0076] Referring to FIG. 6d, the first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1300), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1400). In this case, the first inductor (1110) and the second inductor (1120) may each include one inductor. The first inductor (1110) may be connected to a point (c) between the second switch (S2) and the third switch (S3). The second inductor (1120) may be connected to a point (b) between the first switch (S1) and the second switch (S2). In addition, the first inductor (1110) and the second inductor (1120) may be coupled to each other. When two inductors are combined, there may be an effect of reducing the ripple of the inductor current.

[0077] FIGS. 7A to 7D are circuit diagrams of a first power conversion unit according to another embodiment.

[0078] Figures 7a to 7d illustrate a case where the first switch unit (1130) includes four switches, namely, the first switch to the fourth switch (S1, S2, S3, S4). A first capacitor unit (C1) may be arranged between the first switch (S1), the second switch (S2) and the output unit (1600), and a second capacitor unit (C2) may be arranged between the third switch (S3), the fourth switch (S4) and the output unit (1600).

[0079] Referring to FIG. 7a, the first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1300), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1400). In this case, the first inductor (1110) and the second inductor (1120) may each include one inductor. The first inductor (1110) may be connected to a point (c) between the third switch (S3) and the fourth switch (S4). The second inductor (1120) may be connected to a point (b) between the first switch (S1) and the second switch (S2).

[0080] Referring to FIG. 7b, the first inductor (1110) may be connected to the first electrode (+) of the first connection portion (1300), and the second inductor (1120) may be connected to the second electrode (-) of the second connection portion (1400). In this case, the first inductor (1110) and the second inductor (1120) may each include one inductor. The first inductor (1110) may be connected to a point (a) between the first switch (S1) and the first electrode (+) of the first connection portion (1300). The second inductor (1120) may be connected to a point (d) between the fourth switch (S4) and the second electrode (-) of the second connection portion (1400).

[0081] Referring to Fig. 7c, the first inductor (1110) and the second inductor (1120) may each include two inductors. The two inductors may be connected to the first pole (+) and the second pole (-) of the first connection portion (1300) and the second connection portion (1400), respectively. In addition, the two inductors of the first inductor (1110) and the two inductors of the second inductor (1120) may be coupled to each other. When the two inductors include a coupled form, there may be an effect of reducing the ripple of the inductor current. One inductor of the first inductor (1110) may be connected to a point (a) between the first switch (S1) and the first electrode (+) of the first connection portion (1300), and the other inductor may be connected to a point (c) between the third switch (S3) and the fourth switch (S4). In addition, one inductor of the second inductor (1120) may be connected to a point (d) between the fourth switch (S4) and the second electrode (-) of the second connection portion (1400), and the other inductor may be connected to a point (b) between the first switch (S1) and the second switch (S2).

[0082] Referring to FIG. 7d, the first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1300), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1400). In this case, the first inductor (1110) and the second inductor (1120) may each include one inductor. The first inductor (1110) may be connected to a point (c) between the third switch (S3) and the fourth switch (S4). The second inductor (1120) may be connected to a point (b) between the first switch (S1) and the second switch (S2). In addition, the first inductor (1110) and the second inductor (1120) may be coupled to each other. When two inductors are combined, there may be an effect of reducing the ripple of the inductor current.

[0083] Figures 8a to 8c are block diagrams of a second power conversion unit according to an embodiment.

[0084] Referring to FIG. 1 and FIG. 8a to FIG. 8c, a power conversion device (1000) according to an embodiment may include a second power conversion unit (1200).

[0085] The second power conversion unit (1200) can receive power from the input unit (1500) and generate two power sources to transmit them to the first connection unit (1300) and the second connection unit (1400). The second power conversion unit (1200) can include a single or multiple power conversion units. When the second power conversion unit (1200) includes a plurality of power conversion units, it can include a plurality of switching units, and the plurality of switching units can be connected in series, parallel, or series-parallel. The single or multiple power conversion units included in the second power conversion unit (1200) can generate one or two link voltages to transmit them to the first connection unit (1300) and the second connection unit (1400). The second power conversion unit (1200) can use a unidirectional converter, and can include, for example, a resonant LLC converter or a PSFB (phase-shift Full-bridge) converter. Additionally, the second power conversion unit (1200) may use a bidirectional converter, and may include, for example, a resonant CLLC converter, a resonant CLLLC converter, and a DAB (Dual active bridge).

[0086] Referring to FIG. 8A, the second power conversion unit (1200) may include a single power conversion unit. In this case, the single power conversion unit may receive power from the input unit (1500) and generate two link powers to transmit them to the first connection unit (1300) and the second connection unit (1400).

[0087] Referring to FIG. 8B, the second power conversion unit (1200) may include two power conversion units. The two power conversion units may be connected in parallel to the input unit (1500). In this case, the two power conversion units may generate link power and transmit power to the first connection unit (1300) and the second connection unit (1400), respectively. In addition, in another embodiment, the two power conversion units may transmit power to both the first connection unit (1300) and the second connection unit (1400), respectively. (Not shown) In this way, when a plurality of power conversion units are connected in parallel, the load can be distributed, thereby reducing the current stress of the second power conversion unit (1200), and thus facilitating heat management.

[0088] Referring to FIG. 8C, the second power conversion unit (1200) may include two power conversion units. The two power conversion units may be connected in series to the input unit (1500). In this case, the two power conversion units may transmit power to both the first connection unit (1300) and the second connection unit (1400), respectively. In addition, in another embodiment, the two power conversion units may transmit power to the first connection unit (1300) and the second connection unit (1400), respectively. (Not shown) In this way, when a plurality of power conversion units are connected in series, the voltage stress of the second switch unit is reduced, thereby having the effect of allowing the use of a switch with a lower withstand voltage.

[0089] Additionally, in other embodiments, multiple power conversion units may be connected in series and parallel to the input unit. (Not shown) Each of the multiple power conversion units may transmit power to both the first connection unit and the second connection unit, or to either the first connection unit or the second connection unit. In this case, the current stress can be reduced, and the voltage stress of the second switching unit can be reduced. This has the effect of enabling the implementation of a large capacity while applying a SiC MOSFET.

[0090] Figures 9 and 10 are circuit diagrams of a second switch unit according to an embodiment.

[0091] Referring to FIGS. 9 and 10, the second power conversion unit according to the embodiment may include a second switch unit (1210).

[0092] The second switch unit (1210) can receive power from the input unit (1500).

[0093] Figure 9a illustrates a case where the second switch unit is a two-level full-bridge. In this case, the second switch unit may include four switches. Figures 9b and 9c illustrate a case where the second switch unit is a two-level half-bridge. In this case, the second switch unit may include two switches.

[0094] Fig. 10a illustrates a case where the second switch unit is a 3-level full-bridge. In this case, the second switch unit may include 12 switches. Fig. 10b illustrates a case where the second switch unit is a 3-level half-bridge. In this case, the second switch unit may include 6 switches. Additionally, it may include 2 capacitors.

[0095] Figures 11 to 13 are circuit diagrams of the second switch unit and the third switch unit according to the embodiment.

[0096] Referring to FIGS. 11 to 13, the second power conversion unit according to the embodiment may further include a third switch unit (1220). The third switch unit (1220) may be connected in series or in parallel with the second switch unit (1210). The third switch unit (1220) may include the same configuration as the second switch unit (1210). The third switch unit (1220) may receive power from the input unit (1500). The second switch unit (1210) and the third switch unit (1220) may supply power to the first connection unit (1300) or the second connection unit (1400), respectively, or may supply power to the first connection unit (1300) and the second connection unit (1400) simultaneously.

[0097] Figures 11a to 11c illustrate a case where the second power conversion unit according to the embodiment is a 2-Level Full-bridge. Figure 11a illustrates a case where the second switch unit (1210) and the third switch unit (1220) are connected in parallel, Figure 11b illustrates a case where the second switch unit (1210) and the third switch unit (1220) are connected in series, and Figure 11c illustrates a case where the second switch unit (1210) and the third switch unit (1220) are connected in series and parallel.

[0098] Figures 12a to 12c illustrate a case where the second power conversion unit according to the embodiment is a 2-Level Half-bridge. Figure 12a illustrates a case where the second switch unit (1210) and the third switch unit (1220) are connected in parallel, Figure 12b illustrates a case where the second switch unit (1210) and the third switch unit (1220) are connected in series, and Figure 12c illustrates a case where the second switch unit (1210) and the third switch unit (1220) are connected in series and parallel.

[0099] Figures 13a to 13c illustrate a case where the second power conversion unit according to another embodiment is a 2-Level Half-bridge. Figure 13a illustrates a case where the second switch unit (1210) and the third switch unit (1220) are connected in parallel, Figure 13b illustrates a case where the second switch unit (1210) and the third switch unit (1220) are connected in series, and Figure 13c illustrates a case where the second switch unit (1210) and the third switch unit (1220) are connected in series and parallel.

[0100] Fig. 14 is a circuit diagram of a transformer according to an embodiment.

[0101] Referring to FIG. 14, the second power conversion unit according to the embodiment may include a transformer. The transformer may receive power and convert voltage. The transformer may be connected to a second switch. The transformer may be positioned between the second switch and the first and second connectors.

[0102] Figure 14a illustrates a transformer in a case where a second power conversion unit according to an embodiment transmits power to a single connection unit via a single switch unit. When the second power conversion unit includes a second switch unit and a third switch unit, and the second switch unit and the third switch unit are connected in series or parallel, each can be connected to a single transformer unit.

[0103] Figures 14b and 14c illustrate a transformer when a second power conversion unit according to an embodiment transmits power to two connection units through one switching unit. The transformer of Figure 14b is composed of one transformer, and a transformer connected in a center-tapped structure can be used. The transformer of Figure 14c is composed of two transformers, and the primary sides (the side adjacent to the input unit) can be connected in series for use. When the second power conversion unit includes a second switching unit and the second switching unit transmits power to the first and second connection units, the transformer can be connected to the first and second connection units.

[0104] Figures 15a to 15d are circuit diagrams of a power conversion device according to an embodiment.

[0105] Referring to FIGS. 15A to 15D, the second power conversion unit (1200) may include a third inductor (1240) and a third capacitor (1250). The third inductor (1240) and the third capacitor (1250) may be arranged between the second switch unit (1210), the third switch unit (1220), and the first transformer unit (1230). The second power conversion unit (1200) may implement ZVS (Zero-Voltage Switching) by including the third inductor (1240). In addition, the second power conversion unit (1200) may include two rectifier circuits. The second power conversion unit (1200) may include a first rectifier circuit (1260) and a second rectifier circuit (1270). The first rectifier circuit (1260) and the second rectifier circuit (1270) may be connected to the first transformer (1230). The first rectifier circuit (1260) may be connected to the first connection unit (1300). The second rectifier circuit (1270) may be connected to the second connection unit (1400). The first rectifier circuit (1260) and the second rectifier circuit (1270) may be connected in series or in parallel with each other.

[0106] Fig. 15a is a circuit diagram of a power conversion device according to the first embodiment.

[0107] Referring to FIG. 15A, the second power conversion unit (1200) generates two link powers using a full-bridge LLC converter, and the first switch unit (1130) of the first power conversion unit (1100) may include three switches. The transformer unit may wind one transformer in a center-tapped structure. The first power conversion unit (1100) may include a first inductor (1110), a second inductor (1120), and a first switch unit (1130). The first switch unit (1130) may include first to third switches (S1, S2, S3). The first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1300), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1400). Capacitors may be included between the first inductor (1110) and the first connection portion (1300) and between the second inductor (1120) and the second connection portion (1400), respectively. The first inductor (1110) and the second inductor (1120) may each include one inductor. The first inductor (1110) may be connected to a point (c) between the second switch (S2) and the third switch (S3). The second inductor (1120) may be connected to a point (b) between the first switch (S1) and the second switch (S2). In addition, the first inductor (1110) and the second inductor (1120) may be coupled to each other. When the two inductors are coupled, there may be an effect of reducing the ripple of the inductor current. The second power conversion unit (1200) may include a second switching unit (1210), a third inductor (1240), a third storage unit (1250), a first transformer unit (1230), a first rectifier circuit (1260), and a second rectifier circuit (1270). The first rectifier circuit (1260) may be connected to the first connecting unit (1300). The second rectifier circuit (1260) may be connected to the second connecting unit (1300). The first rectifier circuit (1260) and the second rectifier circuit (1270) may each include four switches.The first rectifier circuit (1260) and the second rectifier circuit (1270) may be connected to the first transformer (1230). The third inductor (1240) may be arranged between the second switch unit (1210) and the third capacitor unit (1250). The third capacitor unit (1250) may be arranged between the third inductor (1240) and the first transformer unit (1230). The first transformer unit (1230) may be arranged between the third capacitor unit (1250) and the first rectifier circuit (1260) and the second rectifier circuit (1270). The second switch unit (1210) may include four switches.

[0108] Fig. 15b is a circuit diagram of a power conversion device according to the second embodiment.

[0109] Referring to FIG. 15b, the second power conversion unit (1200) generates two link powers using a full-bridge LLC converter, and the first switch unit (1130) of the first power conversion unit (1100) may include four switches. The transformer unit may include two transformers. The first power conversion unit (1100) may include a first inductor (1110), a second inductor (1120), and a first switch unit (1130). The first switch unit (1130) may include first to fourth switches (S1, S2, S3, S4). The first inductor (1110) may be connected to the second electrode (-) of the first connection unit (1300), and the second inductor (1120) may be connected to the first electrode (+) of the second connection unit (1400). Capacitors may be included between the first inductor (1110) and the first connection portion (1300) and between the second inductor (1120) and the second connection portion (1400), respectively. The first inductor (1110) and the second inductor (1120) may each include one inductor. The first inductor (1110) may be connected to a point (c) between the third switch (S3) and the fourth switch (S4). The second inductor (1120) may be connected to a point (b) between the first switch (S1) and the second switch (S2). In addition, the first inductor (1110) and the second inductor (1120) may be coupled to each other. When the two inductors are coupled, there may be an effect of reducing ripple of the inductor current. A first capacitor (C1) and a second capacitor (C2) may be arranged between the first switch unit (1130) and the output unit (1600). The second power conversion unit (1200) may include a second switch unit (1210), a third inductor (1240), a third capacitor (1250), a first transformer unit (1230), a first rectifier circuit (1260), and a second rectifier circuit (1270). The first rectifier circuit (1260) may be connected to the first connection unit (1300). The second rectifier circuit (1260) may be connected to the second connection unit (1300).The first rectifier circuit (1260) and the second rectifier circuit (1270) may each include four switches. The first rectifier circuit (1260) and the second rectifier circuit (1270) may be connected to the first transformer (1230). The third inductor (1240) may be arranged between the second switch unit (1210) and the third capacitor (1250). The third capacitor (1250) may be arranged between the third inductor (1240) and the first transformer unit (1230). The first transformer unit (1230) may be arranged between the third capacitor (1250) and the first rectifier circuit (1260) and the second rectifier circuit (1270). The second switch unit (1210) may include four switches.

[0110] Fig. 15c is a circuit diagram of a power conversion device according to the third embodiment.

[0111] Referring to FIG. 15c, the second power conversion unit (1200) uses two full-bridge LLC converters (transformers) connected in parallel with the input unit (1500), and each LLC converter generates one link power, and the first switch unit (1130) of the first power conversion unit (1100) may include four switches. The transformer unit may include two separate transformers. The first power conversion unit (1100) may include a first inductor (1110), a second inductor (1120), and a first switch unit (1130). The first switch unit (1130) may include first to fourth switches (S1, S2, S3, S4). The first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1300), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1400). In this case, the first inductor (1110) and the second inductor (1120) may each include one inductor. The first inductor (1110) may be connected to a point (c) between the third switch (S3) and the fourth switch (S4). The second inductor (1120) may be connected to a point (b) between the first switch (S1) and the second switch (S2). The second power conversion unit (1200) may include a second switch unit (1210), a third switch unit (1220), a third inductor (1240), a fourth inductor (1241), a third storage unit (1250), a fourth storage unit (1251), a first transformer unit (1230), a second transformer unit (1231), a first rectifier circuit (1260), and a second rectifier circuit (1270). The first rectifier circuit (1260) may be connected to the first connection unit (1300). The second rectifier circuit (1260) may be connected to the second connection unit (1300). The first rectifier circuit (1260) and the second rectifier circuit (1270) may each include four switches. The first rectifier circuit (1260) can be connected to the first transformer (1230), and the second rectifier circuit (1270) can be connected to the second transformer (1231).The third inductor (1240) may be arranged between the second switch unit (1210) and the third capacitor unit (1250). The fourth inductor (1241) may be arranged between the third switch unit (1220) and the fourth capacitor unit (1251). The third capacitor unit (1250) may be arranged between the third inductor (1240) and the first transformer unit (1230). The fourth capacitor unit (1251) may be arranged between the fourth inductor (1241) and the second transformer unit (1231). The first transformer unit (1230) may be arranged between the third capacitor unit (1250) and the first rectifier circuit (1260). The second transformer (1231) may be placed between the fourth capacitor (1251) and the second rectifier circuit (1270). The second switch unit (1210) and the third switch unit (1220) may each include four switches. The second switch unit (1210) and the third switch unit (1220) may be connected in parallel with the input unit (1500).

[0112] Fig. 15d is a circuit diagram of a power conversion device according to the fourth embodiment.

[0113] Referring to FIG. 15d, the second power conversion unit (1200) uses two full-bridge LLC converters (transformers) connected in parallel with the input unit (1500), and each LLC converter generates one link power, and the first switch unit (1130) of the first power conversion unit (1100) may include four switches. The transformer unit may include two separate transformers. The first power conversion unit (1100) may include a first inductor (1110), a second inductor (1120), and a first switch unit (1130). The first switch unit (1130) may include first to fourth switches (S1, S2, S3, S4). The first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1300), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1400). In this case, the first inductor (1110) and the second inductor (1120) may each include one inductor. The first inductor (1110) may be connected to a point (c) between the third switch (S3) and the fourth switch (S4). The second inductor (1120) may be connected to a point (b) between the first switch (S1) and the second switch (S2). The second power conversion unit (1200) may include a second switch unit (1210), a third switch unit (1220), a third inductor (1240), a fourth inductor (1241), a third storage unit (1250), a fourth storage unit (1251), a first transformer unit (1230), a second transformer unit (1231), a first rectifier circuit (1260), and a second rectifier circuit (1270). The first rectifier circuit (1260) may be connected to the first connection unit (1300). The second rectifier circuit (1260) may be connected to the second connection unit (1300). The first rectifier circuit (1260) and the second rectifier circuit (1270) may each include four switches. The first rectifier circuit (1260) can be connected to the first transformer (1230), and the second rectifier circuit (1270) can be connected to the second transformer (1231).The third inductor (1240) may be arranged between the second switch unit (1210) and the third capacitor unit (1250). The fourth inductor (1241) may be arranged between the third switch unit (1220) and the fourth capacitor unit (1251). The third capacitor unit (1250) may be arranged between the third inductor (1240) and the first transformer unit (1230). The fourth capacitor unit (1251) may be arranged between the fourth inductor (1241) and the second transformer unit (1231). The first transformer unit (1230) may be arranged between the third capacitor unit (1250) and the first rectifier circuit (1260). The second transformer (1231) may be arranged between the fourth capacitor (1251) and the second rectifier circuit (1270). The second switch unit (1210) and the third switch unit (1220) may each include four switches. The second switch unit (1210) and the third switch unit (1220) may be connected in series with the input unit (1500).

[0114] Fig. 16 is a circuit diagram showing a case where the power conversion device is in the first mode, and Fig. 17 is a circuit diagram showing a case where the power conversion device is in the second mode.

[0115] Referring to FIGS. 16 and 17, a first power conversion unit of a power conversion device according to an embodiment can be driven in a first mode or a second mode. The first mode can be a first bypass mode. The second mode can be a second bypass mode. The first power conversion unit can transfer power between the input and output using a bypass mode that does not perform repetitive switching. The power conversion device can have the effect of minimizing switching loss while transferring power using the first mode and the second mode.

[0116] Fig. 16a shows a first mode state when the first switch unit (1130) of the first power conversion unit (1100) includes three switches. When the first power conversion unit (1100) is in the first mode, the output voltage of the output unit (1600) may be the sum of the voltages of the power input to the first power conversion unit from the first connection unit (1300) and the second connection unit (1400). When the first power conversion unit (1100) is in the first mode, the first switch (S1) and the third switch (S3) may be in the off state, and the second switch (S2) may be in the on state.

[0117] Fig. 16b shows a first mode state when the first switch unit (1130) of the first power conversion unit (1100) includes four switches. When the first power conversion unit (1100) is in the first mode, the output voltage of the output unit (1600) may be the sum of the voltages of the power input to the first power conversion unit from the first connection unit (1300) and the second connection unit (1400). When the first power conversion unit (1100) is in the first mode, the first switch (S1) and the fourth switch (S4) may be in an off state, and the second switch (S2) and the third switch (S3) may be in an on state.

[0118] Fig. 17a shows a second mode state when the first switch unit (1130) of the first power conversion unit (1100) includes three switches. When the first power conversion unit (1100) is in the second mode, the output current of the output unit (1600) may be the sum of the currents of the power input to the first power conversion unit from the first connection unit (1300) and the second connection unit (1400). When the first power conversion unit (1100) is in the second mode, the first switch (S1) and the third switch (S3) may be in an on state, and the second switch (S2) may be in an off state.

[0119] Fig. 17b shows a second mode state when the first switch unit (1130) of the first power conversion unit (1100) includes four switches. When the first power conversion unit (1100) is in the second mode, the output current of the output unit (1600) may be the sum of the currents of the power input to the first power conversion unit from the first connection unit (1300) and the second connection unit (1400). When the first power conversion unit (1100) is in the second mode, the first switch (S1) and the fourth switch (S4) may be in an on state, and the second switch (S2) and the third switch (S3) may be in an off state.

[0120] Figure 18 is an image showing the operation of each switch when the power conversion device is in the third mode.

[0121] Referring to Fig. 18, the first power conversion unit of the power conversion device according to the embodiment can be driven in a third mode. The third mode can be a switching mode. The third mode can be a mode in which the first switching unit of the first power conversion unit is repeatedly switched. The power conversion device can vary the gain of power capacity expansion by using the third mode. Each switch of the first switching unit of the first power conversion unit can be in an on state or an off state.

[0122] Fig. 18a is an image showing the operation according to the third mode of the switch when the first switch unit of the first power conversion unit includes three switches (S1, S2, S3). Referring to Fig. 18a, when the second switch (S2) is in the on state, the first switch (S1) and the third switch (S3) may be in the off state. In addition, when the second switch (S2) is in the off state, the first switch (S1) and the third switch (S3) may be in the on state. The entire cycle in which the states of the second switch (S2), the first switch (S1), and the third switch (S3) are switched once each may be a switching cycle (Ts). The ratio of the cycle of the second switch (S2) to the switching cycle (Ts) may be a duty ratio (D) and may have a value between 0 and 100 (0% and 100%).

[0123] Figures 18b and 18c are images showing the operation of the switches according to the third mode when the first switch section of the first power conversion section includes four switches (S1, S2, S3, S4). Figure 18a shows the operation according to the third mode when it is a synchronized method without a phase difference. Figure 18c shows the operation according to the third mode when it is an interleaved method with a phase difference.

[0124] Referring to Fig. 18b, when the second switch (S2) is on, the first switch (S1) may be off. Furthermore, when the second switch (S2) is off, the first switch (S1) may be on. Furthermore, when the third switch (S3) is on, the fourth switch (S4) may be off. Furthermore, when the third switch (S3) is off, the fourth switch (S4) may be on. Furthermore, the operating states of the second switch (S2) and the third switch (S3) may be the same. Furthermore, the operating states of the first switch (S1) and the fourth switch (S4) may be the same. The entire cycle in which the states of the second switch (S2) and the first switch (S1) or the third switch (S3) and the fourth switch (S4) are switched once each may be a switching cycle (Ts). The ratio of the cycle of the second switch (S2) or the third switch (S3) to the switching cycle (Ts) can be a duty ratio (D) and can have a value between 0 and 1 (0% to 100%).

[0125] Referring to Fig. 18c, when the second switch (S2) is on, the first switch (S1) may be off. Furthermore, when the second switch (S2) is off, the first switch (S1) may be on. Furthermore, when the third switch (S3) is on, the fourth switch (S4) may be off. Furthermore, when the third switch (S3) is off, the fourth switch (S4) may be on. The entire cycle in which the states of the second switch (S2) and the first switch (S1) or the third switch (S3) and the fourth switch (S4) are switched once each may be a switching cycle (Ts). The ratio of the cycle of the second switch (S2) to the switching cycle (Ts) may be a first duty ratio (D1) and may have a value between 0 and 1 (0% and 100%). In addition, the ratio of the period of the third switch (S3) to the switching period (Ts) may be a second duty ratio (D2), which may have a value between 0 and 100%. In this case, the first duty ratio (D1) and the second duty ratio (D2) may be the same. The switching periods (Ts) of the second switch (S2) and the first switch (S1) and the switching periods (Ts) of the third switch (S3) and the fourth switch (S4) may be phase shifted (Φ). shift ) can have a phase difference (Φ shift ) can have a value from 0˚ to 360˚.

[0126] In the third mode, the input voltage of the input section and the output voltage of the output section can be as shown in mathematical expression 1.

[0127]

[0128] Here, Vout refers to the output voltage to the output of the first power conversion unit, Vin1 and Vin2 refer to the input voltages from the first connection unit and the second connection unit, respectively, and D may be a duty ratio.

[0129] In the third mode, the input current of the input section and the output current of the output section can be as shown in mathematical expression 2.

[0130]

[0131] Here, Iout denotes the output power to the output of the first power conversion unit, Iin1 and Iin2 denote the input currents from the first connection unit and the second connection unit, respectively, and D may be a duty ratio.

[0132] In mathematical expressions 1 and 2, since D has a value of 0 to 1, Vout and Iout can have a value of 0.5 to 1.0 times the sum of the voltages (Vin1+Vin2) or the sum of the currents (Iin1+Iin2) of the two inputs, respectively.

[0133] The first power conversion unit can use the first mode, the second mode, and the third mode in combination. In particular, when the third mode is used between the first and second modes, the effect of continuously outputting the output voltage and output current can be achieved.

[0134] Although the above description focuses on examples, these are merely examples and do not limit the present invention. Those skilled in the art will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the examples can be modified and implemented. In addition, differences related to such modifications and applications should be construed as being included within the scope of the present invention defined in the appended claims.

Claims

1. A first power conversion unit including a first inductor, a second inductor, and a first switch unit; A first connecting portion and a second connecting portion connected to the first power conversion portion; and Including a second power conversion unit connected to the first connection unit and the second connection unit, A power conversion device wherein the first inductor is connected to the first connection portion, and the second inductor is connected to the second connection portion.

2. In paragraph 1, The first connecting portion includes first and second electrodes that are opposite to each other, A power conversion device wherein the first inductor is connected to the first electrode or the second electrode.

3. In paragraph 2, The second connecting portion includes the first electrode and the second electrode which are opposite to each other, A power conversion device in which the second inductor is connected to the first electrode or the second electrode.

4. In paragraph 3, The first inductor is connected between the first connecting portion and the first switching portion, A power conversion device in which the second inductor is connected between the second connecting portion and the first switching portion.

5. In paragraph 4, The above first switch section includes a first switch to a third switch, A power conversion device wherein the second switch is positioned between the first switch and the third switch.

6. In paragraph 5, The first inductor is connected between the second switch and the third switch, A power conversion device in which the second inductor is connected between the first switch and the second switch.

7. In paragraph 5, The above first switch section further includes a fourth switch, The fourth switch is a power conversion device connected to the third switch.

8. In paragraph 7, The first inductor is connected between the third switch and the fourth switch, A power conversion device in which the second inductor is connected between the first switch and the second switch.

9. In paragraph 1, The second power conversion unit includes a second switching unit, The second switch section is a power conversion device that transmits power to the first connection section and the second connection section.

10. In paragraph 9, A power conversion device wherein the second power conversion unit further includes a third switching unit connected in series or in parallel with the second switching unit.

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