Power conversion apparatus

Abstract

A power conversion apparatus according to an embodiment disclosed herein comprises: a first power conversion unit including a first inductor, a second inductor, and a first switch unit; a second power conversion unit including a third inductor, a fourth inductor, and a second switch unit; a first connection unit and a second connection unit which are connected to the first power conversion unit; a third connection unit and a fourth connection unit which are connected to the second power conversion unit; and a third power conversion unit connected to the first to fourth connection units, wherein the first inductor is connected to the first connection unit, the second inductor is connected to the second connection unit, the third inductor is connected to the third connection unit, and the fourth inductor is connected to the fourth 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 input / output voltage range.

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

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

[0007] In addition, a power conversion device capable of maintaining continuous power transmission and expanding the range of input / output voltage and input / 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 second power conversion unit including a third inductor, a fourth inductor, and a second switch unit; a first connection unit and a second connection unit connected to the first power conversion unit; a third connection unit and a fourth connection unit connected to the second power conversion unit; and a third power conversion unit connected to the first connection unit to the fourth connection unit, wherein the first inductor may be connected to the first connection unit, the second inductor may be connected to the second connection unit, the third inductor may be connected to the third connection unit, and the fourth inductor may be connected to the fourth 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 third connecting portion and the fourth connecting portion include the first electrode and the second electrode which are opposite to each other, the third inductor is connected to the first electrode or the second electrode of the third connecting portion, the fourth inductor is connected to the first electrode or the second electrode of the fourth connecting portion, and the third inductor and the fourth inductor can be connected to the opposite electrodes of the third connecting portion and the fourth connecting portion, respectively.

[0013] The first inductor and the third inductor may be connected to the same electrodes of the first connecting portion and the third connecting portion, respectively.

[0014] The second inductor and the fourth inductor may be connected to the same electrodes of the second connecting portion and the fourth connecting portion, respectively.

[0015] A power conversion device according to an embodiment further includes an input unit for receiving power and an output unit for outputting power, wherein the second switching unit is connected to the input unit, and the first switching unit can be connected to the output unit.

[0016] The above third power conversion unit can receive two input powers and output two output powers.

[0017] The third power conversion unit includes a third switch unit and a fourth switch unit, the third switch unit is connected to the third connection unit, and the fourth switch unit can be connected to the fourth connection unit.

[0018] The third power conversion unit may include a first transformer connected to the third switch unit, and a second transformer connected to the fourth switch unit.

[0019] The first transformer can be connected to the first connecting portion, and the second transformer can be connected to the second connecting portion.

[0020] The third power conversion unit includes a third transformer connected to the third switch unit, and a fourth transformer connected to the fourth switch unit, and the first transformer and the third transformer may be coupled, and the second transformer and the fourth transformer may be coupled.

[0021] The third transformer can be connected to the second connecting portion, and the fourth transformer can be connected to the first connecting portion.

[0022] The third inductor may be connected between the third connecting portion and the second switching portion, and the fourth inductor may be connected between the fourth connecting portion and the second switching portion.

[0023] The first switch unit includes first to fourth switches, the second switch unit includes fifth to eighth switches, the third inductor can be connected between the seventh switch and the eighth switch, and the fourth inductor can be connected between the fifth switch and the sixth switch.

[0024] According to an embodiment, a power conversion device having a wide input / output voltage range can be provided.

[0025] In addition, a power conversion device having a wide input / output current range can be provided.

[0026] In addition, a power conversion device capable of simultaneously expanding the input / output voltage range or the input / output current range can be provided.

[0027] In addition, a power conversion device capable of maintaining continuous power transmission and expanding the range of input / output voltage and input / output current can be provided.

[0028] 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.

[0029] Fig. 1 is a block diagram of a power conversion device according to an embodiment;

[0030] Fig. 2 is a block diagram of a first power conversion unit according to an embodiment;

[0031] Fig. 3 is a block diagram of a second power conversion unit according to an embodiment;

[0032] Fig. 4 is a circuit diagram of an inductor according to an embodiment,

[0033] Figures 5 and 6 are circuit diagrams of a first switch unit and a second switch unit according to an embodiment,

[0034] Figures 7a to 7d are circuit diagrams of a first power conversion unit according to an embodiment,

[0035] Figures 8a to 8d are circuit diagrams of a first power conversion unit according to another embodiment,

[0036] Figures 9a to 9c are block diagrams of a second power conversion unit according to an embodiment.

[0037] Figures 10a to 10c, 11a and 11b are circuit diagrams of a second switch unit according to an embodiment,

[0038] FIGS. 12a to 12c, 13a to 13c and 14a to 14c are circuit diagrams of a second switch unit and a third switch unit according to an embodiment.

[0039] Fig. 15 is a circuit diagram of a transformer according to an embodiment.

[0040] Figures 16a and 16b are circuit diagrams of a power conversion device according to an embodiment;

[0041] Figures 17a and 17b are circuit diagrams showing a case where the power conversion device is in the first mode.

[0042] Figures 18a and 18b are circuit diagrams showing a case where the power conversion device is in the second mode.

[0043] Figures 19a to 19c 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 third power conversion unit (1300), a first connection unit (1400), a second connection unit (1500), a third connection unit (1600), a fourth connection unit (1700), an input unit (1800), and an output unit (1900).

[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 (1800). The received voltage can reach the third power conversion unit (1300) through the third and fourth connection units (1600, 1700) via the second power conversion unit (1200). Power conversion can occur in the third power conversion unit (1300), and the converted power can reach the first power conversion unit (1100) through the first and second connection units (1400, 1500). The reached power can be output from the first power conversion unit 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 second power conversion unit (1200), and output through the third power conversion unit (1300).

[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 (1400) and a second connection unit (1500) and convert voltage or current. The first power conversion unit (1100) may convert power and output it through an output unit (1900). 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. The first power conversion unit (1100) can enable gain variation for power capacity expansion and can enable expansion of the range of output voltage and current.

[0059] A power conversion device (1000) according to an embodiment may include a first connection unit (1400) and a second connection unit (1500). The first connection unit (1400) and the second connection unit (1500) may be disposed between a first power conversion unit (1100) and a third power conversion unit (1300). The first connection unit (1400) and the second connection unit (1500) may be disposed between the first power conversion unit (1100) and the third power conversion unit (1300) and may be electrically connected to the first power conversion unit (1100) and the third power conversion unit (1300). The first connection unit (1400) and the second connection unit (1500) may receive power from the third power conversion unit (1300) and transmit it to the first power conversion unit (1100). In addition, the first connecting portion (1400) and the second connecting portion (1500) can receive power from the first power conversion portion (1100) and transmit it to the third power conversion portion (1300). The first connecting portion (1400) and the second connecting portion (1500) 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 (1400) 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 (1400) 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 (1500) can be connected to point b of the first switching portion (1130) through the second inductor (1120). The second electrode (-) of the second connecting portion (1500) can be connected to point d of the first switching portion (1130) through the second inductor (1120). The power conversion device (1000) can transmit two link voltages to the first power conversion portion (1100) through the first connecting portion (1400) and the second connecting portion (1500), thereby enabling gain variation for power capacity expansion and expansion of the range of output voltage and current.

[0060] A capacitor (Capacitor, C) may be connected between the first connecting portion (1400) and the second connecting portion (1500) and the first inductor (1110) and the second inductor (1120), respectively. By including the capacitor between the first connecting portion (1400) and the second connecting portion (1500) 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 switch portion (1130) and the output portion (1900). By including the capacitor between the first switch portion (1130) and the output portion (1900), noise and ripple may be reduced.

[0061] Fig. 3 is a block diagram of a second power conversion unit according to an embodiment.

[0062] Referring to FIGS. 1 and 3, a power conversion device (1000) according to an embodiment may include a second power conversion unit (1200). The second power conversion unit (1200) may include a third inductor (1210), a fourth inductor (1220), and a second switch unit (1230). The second power conversion unit (1200) may receive power from an input unit (1800) and convert it into voltage or current. The second power conversion unit (1200) may convert the power and transmit it to a third power conversion unit (1300) through a third connection unit (1600) and a fourth connection unit (1700). The second power conversion unit (1200) may include a non-isolated power conversion circuit that receives power as input and generates output. In addition, the power transmission direction of the second power conversion unit (1200) is not limited to the forward direction, and can be used in both directions or in the reverse direction. The second power conversion unit (1200) can enable gain variation for power capacity expansion, and can enable expansion of the range of input voltage and current.

[0063] A power conversion device (1000) according to an embodiment may include a third connection unit (1600) and a fourth connection unit (1700). The third connection unit (1600) and the fourth connection unit (1700) may be disposed between the second power conversion unit (1200) and the third power conversion unit (1300). The third connection unit (1600) and the fourth connection unit (1700) may be disposed between the second power conversion unit (1200) and the third power conversion unit (1300) and may be electrically connected to the second power conversion unit (1200) and the third power conversion unit (1300). The third connection unit (1600) and the fourth connection unit (1700) may receive power from the second power conversion unit (1200) and transmit it to the third power conversion unit (1300). In addition, the third connecting portion (1600) and the fourth connecting portion (1700) can receive power from the third power conversion portion (1300) and transmit it to the second power conversion portion (1200). The third connecting portion (1600) and the fourth connecting portion (1700) 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 third connecting portion (1600) can be connected to point a of the second switch portion (1230) through the third inductor (1210). The second electrode (-) of the third connecting portion (1600) can be connected to point c of the second switch portion (1230) through the third inductor (1210). The first electrode (+) of the fourth connecting portion (1700) can be connected to point b of the second switching portion (1230) through the fourth inductor (1220). The second electrode (-) of the fourth connecting portion (1700) can be connected to point d of the second switching portion (1230) through the fourth inductor (1220). The power conversion device (1000) can transmit two link voltages to the third power conversion portion (1300) through the third connecting portion (1600) and the second connecting portion (1700), thereby enabling gain variation for power capacity expansion and expansion of the range of input voltage and current.

[0064] A capacitor (Capacitor, C) may be connected between the third connection unit (1600) and the fourth connection unit (1700) and the third inductor (1210) and the fourth inductor (1220), respectively. By including the capacitor between the third connection unit (1600) and the fourth connection unit (1700) and the third inductor (1210) and the fourth inductor (1220), noise and ripple may be reduced. In addition, a capacitor may be connected between the second switch unit (1230) and the input unit (1800). By including the capacitor between the second switch unit (1230) and the input unit (1800), noise and ripple may be reduced.

[0065] Fig. 4 is a circuit diagram of an inductor according to an embodiment.

[0066] Referring to FIGS. 2 to 4, 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.

[0067] The first inductor (1110) may be connected to the first connection unit (1400). The first inductor (1110) may be connected in series with the first connection unit (1400). The first inductor (1110) may be connected to the first connection unit (1400) to generate power according to a change in the current supplied from the first connection unit (1400). 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).

[0068] The second inductor (1120) may be connected to the second connection unit (1500). The second inductor (1120) may be connected in series with the second connection unit (1500). The second inductor (1120) may be connected to the second connection unit (1500) to generate power according to a change in the current supplied from the second connection unit (1500). 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).

[0069] In addition, the second power conversion unit (1200) may include a third inductor (1210) and a fourth inductor (1220). The third inductor (1210) and the fourth inductor (1220) may generate power according to changes in the flowing current over time. As the change in the current of the third inductor (1210) and the fourth inductor (1220) increases, the intensity of the generated power may increase. The third inductor (1210) and the fourth inductor (1220) may generate power in a direction opposite to the direction of the current. The third inductor (1210) and the fourth inductor (1220) may each receive separate power supplies.

[0070] The third inductor (1210) may be connected to the third connection unit (1600). The third inductor (1210) may be connected in series with the third connection unit (1600). The third inductor (1210) may be connected to the third connection unit (1600) to generate power according to changes in the current supplied from the third connection unit (1600). In addition, the third inductor (1210) may be connected to the second switch unit (1230). The third inductor (1210) may be electrically connected to the second switch unit (1230) to transmit an output voltage to the second switch unit (1230).

[0071] The fourth inductor (1220) may be connected to the fourth connection unit (1700). The fourth inductor (1220) may be connected in series with the fourth connection unit (1700). The fourth inductor (1220) may be connected to the fourth connection unit (1700) to generate power according to a change in the current supplied from the fourth connection unit (1700). In addition, the fourth inductor (1220) may be connected to the second switch unit (1230). The fourth inductor (1220) may be electrically connected to the second switch unit (1230) to transmit an output voltage to the second switch unit (1230).

[0072] Referring to FIG. 4, the inductor according to the embodiment may include a single or multiple inductors. The inductors may include a first inductor (1110), a second inductor (1120), a third inductor (1210), and a fourth inductor (1220).

[0073] Referring to Fig. 4a, the inductor may include two inductors. In this case, the two inductors may be connected to the first and second poles of the connection portion, respectively. Referring to Figs. 4b and 4c, the inductor may include one inductor. In this case, the inductor may be connected to the first or second pole of the connection portion. Referring to Fig. 4d, the inductor may include a form in which two inductors are combined. In this case, the two inductors may be connected to the first and second poles of the connection portion, respectively, and the two inductors may be connected and combined. When the form in which two inductors are combined is included, the effect of reducing the ripple of the inductor current may be achieved.

[0074] Figures 5 and 6 are circuit diagrams of a first switch unit and a second switch unit according to an embodiment.

[0075] Referring to FIGS. 2, 5, and 6, 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. 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.

[0076] In addition, the second power conversion unit (1200) may include a second switch unit (1230). The second switch unit (1230) may include a plurality of switches to allow or block current. The second switch unit (1230) may allow or block input current to be transmitted to the third inductor (1210) and the fourth inductor (1220). The second switch unit (1230) 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.

[0077] Referring to FIG. 5A, 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. 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, 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.

[0078] Referring to FIG. 6A, 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. 6b, 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. 6c, 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. 6d, 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.

[0079] In addition, the second switch unit (1230) may include the fifth to eighth switches. The configuration of the first switch unit (1130) illustrated in FIGS. 5 and 6 may be equally applied to the second switch unit (1230). In this case, the first switch unit (1130) corresponds to the second switch unit (1230), and the first to fourth switches (S1, S2, S3, S4) may correspond to the fifth to eighth switches, respectively.

[0080] Figures 7a to 7d are circuit diagrams of a first power conversion unit according to an embodiment.

[0081] Figures 7a to 7d 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 (1900).

[0082] Referring to FIG. 7a, the first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1400), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1500). 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).

[0083] Referring to FIG. 7b, the first inductor (1110) may be connected to the first electrode (+) of the first connection portion (1400), and the second inductor (1120) may be connected to the second electrode (-) of the second connection portion (1500). 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 (1400). 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 (1500).

[0084] 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 (1400) and the second connection portion (1500), 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 (1400), 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 (1500), and the other inductor may be connected to a point (b) between the first switch (S1) and the second switch (S2).

[0085] Referring to FIG. 7d, the first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1400), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1500). 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.

[0086] The configuration of the first power conversion unit (1100) illustrated in FIGS. 7A and 7B can be equally applied to the second power conversion unit. In this case, the first inductor (1110) corresponds to the third inductor, the second inductor (1120) corresponds to the fourth inductor, the first connection unit (1400) corresponds to the third connection unit, the second connection unit (1500) corresponds to the fourth connection unit, and the first to third switches (S1, S2, S3) can correspond to the fifth to seventh switches, respectively.

[0087] FIGS. 8A to 8D are circuit diagrams of a first power conversion unit according to another embodiment.

[0088] Figures 8a to 8d 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).

[0089] Referring to FIG. 8A, the first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1400), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1500). 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).

[0090] Referring to FIG. 8B, the first inductor (1110) may be connected to the first electrode (+) of the first connection portion (1400), and the second inductor (1120) may be connected to the second electrode (-) of the second connection portion (1500). 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 (1400). 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 (1500).

[0091] Referring to FIG. 8C, 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 (1400) and the second connection portion (1500), 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 (1400), 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 (1500), and the other inductor may be connected to a point (b) between the first switch (S1) and the second switch (S2).

[0092] Referring to FIG. 8d, the first inductor (1110) may be connected to the second electrode (-) of the first connection portion (1400), and the second inductor (1120) may be connected to the first electrode (+) of the second connection portion (1500). 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.

[0093] The configuration of the first power conversion unit (1100) illustrated in FIGS. 8A to 8B can be equally applied to the second power conversion unit. In this case, the first inductor (1110) corresponds to the third inductor, the second inductor (1120) corresponds to the fourth inductor, the first connection unit (1400) corresponds to the third connection unit, the second connection unit (1500) corresponds to the fourth connection unit, and the first to fourth switches (S1, S2, S3, S4) can correspond to the fifth to eighth switches, respectively.

[0094] Figures 9a to 9c are block diagrams of a third power conversion unit according to an embodiment.

[0095] Referring to FIG. 1 and FIG. 9a to FIG. 9c, a power conversion device (1000) according to an embodiment may include a third power conversion unit (1300).

[0096] The third power conversion unit (1300) can receive power from the second power conversion unit (1200) to generate two power sources and transmit them to the first power conversion unit (1100). The third power conversion unit (1300) can receive power from the second power conversion unit (1200). A third connection unit (1600) and a fourth connection unit (1700) are arranged between the third power conversion unit (1300) and the second power conversion unit (1200), so that the third power conversion unit (1300) can receive power from the third connection unit (1600) and the fourth connection unit (1700). In addition, the third power conversion unit (1300) can transmit power to the first power conversion unit (1100). A first connection part (1400) and a second connection part (1500) are arranged between the third power conversion unit (1300) and the first power conversion unit (1100), so that the third power conversion unit (1300) can transmit power through the first connection part (1400) and the second connection part (1500). The third power conversion unit (1300) can be electrically connected to the first to fourth connection parts (1400, 1500, 1600, 1700).

[0097] The third power conversion unit (1300) may include a single or multiple power conversion units. When the third power conversion unit (1300) includes multiple power conversion units, it may include multiple switching units, and the multiple switching units may be connected in series, parallel, or series-parallel. The single or multiple power conversion units included in the third power conversion unit (1300) may generate one or two link voltages and transmit them to the first connection unit (1400) and the second connection unit (1500). The third power conversion unit (1300) may use a unidirectional converter, and may include, for example, a resonant LLC converter or a PSFB (phase-shift Full-bridge) converter. In addition, the third power conversion unit (1300) may use a bidirectional converter, and may include, for example, a resonant CLLC converter, a resonant CLLLC converter, or a DAB (Dual active bridge).

[0098] Referring to FIG. 9A, the third power conversion unit (1300) may include a single power conversion unit. In this case, the single power conversion unit may receive power from the third connection unit (1600) and the fourth connection unit (1700) to generate two link power sources and transmit them to the first connection unit (1400) and the second connection unit (1500).

[0099] Referring to FIG. 9B, the third power conversion unit (1300) may include two power conversion units. The two power conversion units may be connected in parallel with the third connection unit (1600) and the fourth connection unit (1700). In this case, the two power conversion units may generate link power and transmit power to the first connection unit (1400) and the second connection unit (1500), respectively. In addition, in another embodiment, the two power conversion units may transmit power to both the first connection unit (1400) and the second connection unit (1500), 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 third power conversion unit (1300), and thus facilitating heat management.

[0100] Referring to FIG. 9c, the third power conversion unit (1300) may include two power conversion units. The two power conversion units may be connected in series with the third connection unit (1600) and the fourth connection unit (1700). In this case, the two power conversion units may transmit power to both the first connection unit (1400) and the second connection unit (1500), 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 (1500), 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 enabling the use of a switch with a lower withstand voltage.

[0101] 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.

[0102] Figures 10 and 11 are circuit diagrams of a third switch unit according to an embodiment.

[0103] Referring to FIGS. 10 and 11, the third power conversion unit according to the embodiment may include a third switch unit (1310).

[0104] The third switch unit (1310) can receive power from the third connection unit (1600) and the fourth connection unit (1700).

[0105] Figure 10a illustrates a case where the third switch unit is a two-level full-bridge. In this case, the third switch unit may include four switches. Figures 10b and 10c illustrate a case where the third switch unit is a two-level half-bridge. In this case, the third switch unit may include two switches.

[0106] Figure 11a illustrates a case where the third switch unit is a 3-level full-bridge. In this case, the third switch unit may include 12 switches. Figure 11b illustrates a case where the third switch unit is a 3-level half-bridge. In this case, the third switch unit may include 6 switches. Additionally, it may include 2 capacitors.

[0107] Figures 12 to 14 are circuit diagrams of the third switch section and the fourth switch section according to the embodiment.

[0108] Referring to FIGS. 12 to 14, the third power conversion unit according to the embodiment may further include a fourth switch unit (1320). The fourth switch unit (1320) may be connected in series or in parallel with the third switch unit (1310). The fourth switch unit (1320) may include the same configuration as the third switch unit (1310). The fourth switch unit (1320) may receive power from the third connection unit (1600) and the fourth connection unit (1700). The third switch unit (1310) and the fourth switch unit (1320) 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.

[0109] Figures 12a to 12c illustrate a case where the third power conversion unit according to the embodiment is a 2-Level Full-bridge. Figure 12a illustrates a case where the third switch unit (1310) and the fourth switch unit (1320) are connected in parallel, Figure 12b illustrates a case where the third switch unit (1310) and the fourth switch unit (1320) are connected in series, and Figure 12c illustrates a case where the third switch unit (1310) and the fourth switch unit (1320) are connected in series and parallel.

[0110] Figures 13a to 13c illustrate a case where the third power conversion unit according to the embodiment is a 2-Level Half-bridge. Figure 13a illustrates a case where the third switch unit (1310) and the fourth switch unit (1320) are connected in parallel, Figure 13b illustrates a case where the third switch unit (1310) and the fourth switch unit (1320) are connected in series, and Figure 13c illustrates a case where the third switch unit (1310) and the fourth switch unit (1320) are connected in series and parallel.

[0111] Figures 14a to 14c illustrate a case where the third power conversion unit according to another embodiment is a 2-Level Half-bridge. Figure 14a illustrates a case where the third switch unit (1310) and the fourth switch unit (1320) are connected in parallel, Figure 14b illustrates a case where the third switch unit (1310) and the fourth switch unit (1320) are connected in series, and Figure 14c illustrates a case where the third switch unit (1310) and the fourth switch unit (1320) are connected in series and parallel.

[0112] Fig. 15 is a circuit diagram of a transformer according to an embodiment.

[0113] Referring to FIG. 15, the third power conversion unit according to the embodiment may include a transformer (1330). The transformer (1330) may receive power and convert voltage. The transformer (1330) may be connected to the second switching unit. The transformer (1330) may be positioned between the second switching unit and the first and second connecting units.

[0114] Fig. 15a illustrates a transformer (1330) in a case where a third power conversion unit according to an embodiment transmits power to a single connection unit through a single switch unit. If the third power conversion unit includes a third switch unit and a fourth switch unit, and the third switch unit and the fourth switch unit are connected in series or in parallel, each can be connected to a single transformer unit (1330).

[0115] Figures 15b and 15c illustrate a transformer when a third power conversion unit according to an embodiment transmits power to two connection units through one switching unit. The transformer of Figure 15b is composed of one transformer, and a transformer connected in a center-tapped structure can be used. The transformer of Figure 15c 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 third power conversion unit includes a third switching unit and the third switching unit transmits power to the first and second connection units, the transformer can be connected to the first and second connection units.

[0116] Figures 16a and 16b are circuit diagrams of a power conversion device according to an embodiment.

[0117] Referring to FIGS. 16A and 16B, the third power conversion unit (1300) may include a fifth inductor (1340) and a fifth capacitor (1350). The fifth inductor (1340) and the fifth capacitor (1350) may be arranged between the third switch unit (1310), the fourth switch unit (1320), and the first transformer unit (1330). The third power conversion unit (1300) may implement ZVS (Zero-Voltage Switching) by including the fifth inductor (1340). In addition, the third power conversion unit (1300) may include two rectifier circuits. The third power conversion unit (1300) may include a first rectifier circuit (1360) and a second rectifier circuit (1370). The first rectifier circuit (1360) and the second rectifier circuit (1370) may be connected to the first transformer (1330). The first rectifier circuit (1360) may be connected to the first connection unit (1400). The second rectifier circuit (1370) may be connected to the second connection unit (1500). The first rectifier circuit (1360) and the second rectifier circuit (1370) may be connected in series or in parallel with each other. In addition, the third power conversion unit (1300) may include a sixth inductor (1341), a sixth storage unit (1351), and a second transformer unit (1331). The sixth inductor (1341) and the sixth storage unit (1351) may be arranged between the fourth switch unit (1320) and the second transformer unit (1331).

[0118] Fig. 16a is a circuit diagram of a power conversion device according to the first embodiment.

[0119] Referring to FIG. 16A, the third power conversion unit (1300) generates two second link powers from two first link powers using a resonant LLC converter, and the first power conversion unit (1100) and the second power conversion unit (1200) may each include four switches. 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 (1400), and the second inductor (1120) may be connected to the first electrode (+) of the second connection unit (1500). Capacitors may be included between the first inductor (1110) and the first connection portion (1400) and between the second inductor (1120) and the second connection portion (1500), 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). A first capacitor (C1) and a second capacitor (C2) may be arranged between the first switch portion (1130) and the output portion (1900).

[0120] The second power conversion unit (1200) may include a third inductor (1210), a fourth inductor (1220), and a second switch unit (1230). The second switch unit (1230) may include fifth to eighth switches (S5, S6, S7, S8). The third inductor (1210) may be connected to the second electrode (-) of the third connection unit (1600), and the fourth inductor (1220) may be connected to the first electrode (+) of the fifth connection unit (1700). Capacitors may be included between the third inductor (1210) and the third connection unit (1600) and between the fourth inductor (1220) and the fourth connection unit (1700), respectively. The third inductor (1210) and the fourth inductor (1220) may each include one inductor. The third inductor (1210) may be connected to a point (c) between the seventh switch (S7) and the eighth switch (S8). The fourth inductor (1220) may be connected to a point (b) between the fifth switch (S5) and the sixth switch (S6). A third capacitor (C3) and a fourth capacitor (C4) may be arranged between the second switch unit (1230) and the input unit (1800).

[0121] The third power conversion unit (1300) may include a third switch unit (1310), a fourth switch unit (1320), a fifth inductor (1340), a sixth inductor (1341), a fifth storage unit (1350), a sixth storage unit (1351), a first transformer unit (1230), a second transformer unit (1231), a first rectifier circuit (1360), and a second rectifier circuit (1370). The first rectifier circuit (1360) may be connected to the first connection unit (1400). The second rectifier circuit (1370) may be connected to the second connection unit (1500). The first rectifier circuit (1360) and the second rectifier circuit (1370) may each include four switches. The first rectifier circuit (1360) and the second rectifier circuit (1370) may be connected in parallel with the first transformer unit (1330) and the second transformer unit (1331). The fifth inductor (1340) may be arranged between the third switch unit (1310) and the fifth capacitor unit (1350). The fifth capacitor unit (1350) may be arranged between the fifth inductor (1340) and the first transformer unit (1330). The first transformer unit (1330) may be arranged between the fifth capacitor unit (1350) and the first rectifier circuit (1360) and the second rectifier circuit (1370). The third switch unit (1310) may include four switches. The third switch unit (1310) may be connected to the third connection unit (1600). The sixth inductor (1341) may be arranged between the fourth switch unit (1320) and the sixth capacitor unit (1351). The sixth capacitor unit (1351) may be arranged between the sixth inductor (1341) and the second transformer unit (1331). The second transformer unit (1331) may be arranged between the sixth capacitor unit (1351) and the first rectifier circuit (1360) and the second rectifier circuit (1370). The fourth switch unit (1320) may include four switches. The fourth switch unit (1320) may be connected to the fourth connection unit (1700). The first transformer unit (1330) and the second transformer unit (1331) may each include two transformers. The first transformer (1330) and the second transformer (1331) can be combined into two transformers.

[0122] Fig. 16b is a circuit diagram of a power conversion device according to the first embodiment.

[0123] Referring to FIG. 16b, the third power conversion unit (1300) generates two second link powers from two first link powers using a DAB converter capable of bidirectional power transmission, and the first power conversion unit (1100) and the second power conversion unit (1200) may each include four switches. 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 (1400), and the second inductor (1120) may be connected to the first electrode (+) of the second connection unit (1500). Capacitors may be included between the first inductor (1110) and the first connection portion (1400) and between the second inductor (1120) and the second connection portion (1500), 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). A first capacitor (C1) and a second capacitor (C2) may be arranged between the first switch portion (1130) and the output portion (1900).

[0124] The second power conversion unit (1200) may include a third inductor (1210), a fourth inductor (1220), and a second switch unit (1230). The second switch unit (1230) may include fifth to eighth switches (S5, S6, S7, S8). The third inductor (1210) may be connected to the second electrode (-) of the third connection unit (1600), and the fourth inductor (1220) may be connected to the first electrode (+) of the fifth connection unit (1700). Capacitors may be included between the third inductor (1210) and the third connection unit (1600) and between the fourth inductor (1220) and the fourth connection unit (1700), respectively. The third inductor (1210) and the fourth inductor (1220) may each include one inductor. The third inductor (1210) may be connected to a point (c) between the seventh switch (S7) and the eighth switch (S8). The fourth inductor (1220) may be connected to a point (b) between the fifth switch (S5) and the sixth switch (S6). A third capacitor (C3) and a fourth capacitor (C4) may be arranged between the second switch unit (1230) and the input unit (1800).

[0125] The third power conversion unit (1300) may include a third switch unit (1310), a fourth switch unit (1320), a fifth inductor (1340), a sixth inductor (1341), a fifth storage unit (1350), a sixth storage unit (1351), a first transformer unit (1230), a second transformer unit (1231), a first rectifier circuit (1360), and a second rectifier circuit (1370). The first rectifier circuit (1360) may be connected to the first connection unit (1400). The second rectifier circuit (1370) may be connected to the second connection unit (1500). The first rectifier circuit (1360) and the second rectifier circuit (1370) may each include four switches. The first rectifier circuit (1360) may be connected to the first transformer (1330). The second rectifier circuit (1370) may be connected to the second transformer (1331). The first rectifier circuit (1360) and the second rectifier circuit (1370) may be connected in series. The fifth inductor (1340) may be arranged between the third switch unit (1310) and the fifth capacitor (1350). The fifth capacitor (1350) may be arranged between the fifth inductor (1340) and the first transformer (1330). The first transformer (1330) may be arranged between the fifth capacitor (1350) and the first rectifier circuit (1360) and the second rectifier circuit (1370). The third switch unit (1310) may include four switches. The third switch unit (1310) may be connected to the third connection unit (1600). The sixth inductor (1341) may be arranged between the fourth switch unit (1320) and the sixth capacitor unit (1351). The sixth capacitor unit (1351) may be arranged between the sixth inductor (1341) and the second transformer unit (1331). The second transformer unit (1331) may be arranged between the sixth capacitor unit (1351) and the first rectifier circuit (1360) and the second rectifier circuit (1370). The fourth switch unit (1320) may include four switches. The fourth switch unit (1320) may be connected to the fourth connection unit (1700). The first transformer unit (1330) and the second transformer unit (1331) may each include one transformer.

[0126] Fig. 17 is a circuit diagram showing a case where the power conversion device is in the first mode, and Fig. 18 is a circuit diagram showing a case where the power conversion device is in the second mode.

[0127] Referring to FIGS. 17 and 18, 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.

[0128] Fig. 17a 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.

[0129] Fig. 17b 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.

[0130] Fig. 18a 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.

[0131] Fig. 18b 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.

[0132] Figure 19 is an image showing the operation of each switch when the power conversion device is in the third mode.

[0133] Referring to Fig. 19, the first power conversion unit of the power conversion device according to the embodiment may be driven in a third mode. The third mode may be a switching mode. The third mode may 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 may be in an on state or an off state.

[0134] Fig. 19a 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. 19a, 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%).

[0135] Figures 19b and 19c are images showing the operation according to the third mode of the switch 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.

[0136] Referring to Fig. 19b, 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%).

[0137] Referring to Fig. 19c, 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˚.

[0138] 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.

[0139]

[0140] 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.

[0141] 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.

[0142]

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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 second power conversion unit including a third inductor, a fourth inductor, and a second switch unit; A first connecting portion and a second connecting portion connected to the first power conversion portion; A third connection part and a fourth connection part connected to the second power conversion part; and Including a third power conversion unit connected to the first connecting unit to the fourth connecting unit, The first inductor is connected to the first connection portion, and the second inductor is connected to the second connection portion, A power conversion device wherein the third inductor is connected to the third connection portion, and the fourth inductor is connected to the fourth 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 third connecting portion and the fourth connecting portion include the first electrode and the second electrode which are opposite to each other, The third inductor is connected to the first electrode or the second electrode of the third connecting portion, The fourth inductor is connected to the first electrode or the second electrode of the fourth connecting portion, A power conversion device in which the third inductor and the fourth inductor are connected to opposite electrodes of the third connection portion and the fourth connection portion, respectively.

5. In paragraph 4, A power conversion device wherein the first inductor and the third inductor are connected to the same electrodes of the first connecting portion and the third connecting portion, respectively.

6. In paragraph 4, A power conversion device wherein the second inductor and the fourth inductor are connected to the same electrodes of the second connection portion and the fourth connection portion, respectively.

7. In paragraph 1, It further includes an input section for receiving power and an output section for outputting power, The above second switch unit is connected to the input unit, The above first switch unit is a power conversion device connected to the output unit.

8. In paragraph 1, The above third power conversion unit is a power conversion device that receives two input powers and outputs two output powers.

9. In paragraph 8, The third power conversion unit includes a third switch unit and a fourth switch unit, The third switch section is connected to the third connection section, The fourth switch section is a power conversion device connected to the fourth connection section.

10. In paragraph 9, A power conversion device including a first transformer connected to the third switch unit and a second transformer connected to the fourth switch unit, wherein the third power conversion unit is a power conversion device.

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