Power conversion device

Abstract

A power conversion device according to an embodiment disclosed herein includes: a first power conversion unit including a first inductor, a second inductor, and a first switching unit; a second power conversion unit including a third inductor, a fourth inductor, and a second switching 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 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

Technical Field

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

[0002] Recently, there has been increasing interest in fast chargers for electric vehicles, energy storage systems (ESS), and photovoltaic power generation. Power conversion devices used in conjunction with batteries in these applications require a wide output voltage range to cover a broad range of battery voltages. Furthermore, high current is also required due to the high power capacity demands of these applications. Therefore, there is a need to develop power conversion devices with a wide output voltage range.

[0003] The problem with traditional power conversion circuits is that they are subject to high voltage and current stresses and it is difficult to ensure input / output voltage gain. Summary of the Invention

[0004] Technical issues

[0005] The embodiment provides a power conversion device with a wide input / output voltage range.

[0006] In addition, a power conversion device with a wide input / output current range is provided.

[0007] In addition, a power conversion device capable of simultaneously expanding the input / output voltage range or the input / output current range is provided.

[0008] In addition, a power conversion device is provided that can extend the input / output voltage range or the input / output current range while maintaining continuous power transmission.

[0009] The purpose of the embodiments is not limited thereto, and may include purposes or effects that can be understood from the technical solutions or embodiments described below.

[0010] Technical solution

[0011] The power conversion device according to an embodiment may include: a first power conversion unit, the first power conversion unit including a first inductor, a second inductor and a first switching unit; a second power conversion unit, the second power conversion unit including a third inductor, a fourth inductor and a second switching unit; a first connection unit and a second connection unit, the first connection unit and the second connection unit being connected to the first power conversion unit; a third connection unit and a fourth connection unit, the third connection unit and the fourth connection unit being connected to the second power conversion unit; and a third power conversion unit, the third power conversion unit being 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.

[0012] The first connection unit may include a first electrode and a second electrode with opposite polarities, and the first inductor may be connected to either the first electrode or the second electrode.

[0013] The second connection unit may include a first electrode and a second electrode with opposite polarities, and the second inductor may be connected to either the first electrode or the second electrode.

[0014] Each of the third and fourth connection units may include a first electrode and a second electrode with opposite polarities. The third inductor may be connected to either the first or second electrode of the third connection unit, and the fourth inductor may be connected to either the first or second electrode of the fourth connection unit. The third and fourth inductors may be connected to opposite electrodes of the third and fourth connection units, respectively.

[0015] The first inductor and the third inductor can be connected to the same electrodes of the first connection unit and the third connection unit, respectively.

[0016] The second inductor and the fourth inductor can be connected to the same electrodes of the second connection unit and the fourth connection unit, respectively.

[0017] The power conversion device according to the embodiment may further include an input unit for receiving power and an output unit for outputting power, wherein a second switching unit may be connected to the input unit and a first switching unit may be connected to the output unit.

[0018] The third power conversion unit can receive two power inputs and output two power outputs.

[0019] The third power conversion unit may include a third switch unit and a fourth switch unit. The third switch unit may be connected to the third connection unit, and the fourth switch unit may be connected to the fourth connection unit.

[0020] The third power conversion unit may include a first transformer unit connected to the third switching unit and a second transformer unit connected to the fourth switching unit.

[0021] The first transformer unit can be connected to the first connection unit, and the second transformer unit can be connected to the second connection unit.

[0022] The third power conversion unit may include a third transformer unit connected to the third switching unit and a fourth transformer unit connected to the fourth switching unit. The first transformer unit and the third transformer unit may be combined, and the second transformer unit and the fourth transformer unit may be combined.

[0023] The third transformer unit can be connected to the second connection unit, and the fourth transformer unit can be connected to the first connection unit.

[0024] The third inductor can be connected between the third connection unit and the second switching unit, and the fourth inductor can be connected between the fourth connection unit and the second switching unit.

[0025] The first switching unit may include a first switch to a fourth switch, the second switching unit may include a fifth switch to an eighth switch, the third inductor may be connected between the seventh switch and the eighth switch, and the fourth inductor may be connected between the fifth switch and the sixth switch.

[0026] Beneficial effects

[0027] According to the embodiments, it is possible to provide a power conversion device with a wide input / output voltage range.

[0028] In addition, it can provide power conversion equipment with a wide input / output current range.

[0029] In addition, it is possible to provide a power conversion device that can simultaneously expand the input / output voltage range or the input / output current range.

[0030] In addition, it is possible to provide a power conversion device that can extend the input / output voltage range or the input / output current range while maintaining continuous power transmission.

[0031] The various advantages and effects of the present invention are not limited to those described above, and can be more easily understood in the process of describing specific embodiments of the present invention. Attached Figure Description

[0032] Figure 1 This is a block diagram of a power conversion device according to an embodiment. Figure 2 This is a block diagram of the first power conversion unit according to an embodiment. Figure 3 This is a block diagram of the second power conversion unit according to an embodiment. Figure 4 This is a circuit diagram of the inductor according to an embodiment. Figure 5 and Figure 6 This is a circuit diagram of the first and second switching units according to the embodiment. Figures 7a to 7d This is a circuit diagram of the first power conversion unit according to the embodiment. Figures 8a to 8d This is a circuit diagram of the first power conversion unit according to another embodiment. Figures 9a to 9c This is a block diagram of the second power conversion unit according to an embodiment. Figures 10a to 10c , Figure 11a and Figure 11bThis is a circuit diagram of the second switching unit according to the embodiment. Figures 12a to 12c , Figures 13a to 13c and Figures 14a to 14c This is a circuit diagram of the second and third switching units according to the embodiment. Figure 15 This is a circuit diagram of the transformer unit according to an embodiment. Figure 16a and Figure 16b This is a circuit diagram of the power conversion device according to an embodiment. Figure 17a and Figure 17b This is a circuit diagram showing the power conversion equipment in its first mode. Figure 18a and Figure 18b This is a circuit diagram showing the power conversion device in its second mode, and Figures 19a to 19c This is an image showing the drive of each switch when the power conversion device is in the third mode. Detailed Implementation

[0033] In the following, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0034] However, the technical concept of the present invention is not limited to the embodiments described, but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more components in the embodiments can be selectively combined or substituted.

[0035] Furthermore, unless clearly and specifically defined and described, the terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that is generally understood by one of ordinary skill in the art to which the invention pertains, and commonly used terms (such as terms defined in dictionaries) may be interpreted taking into account their contextual meaning in the relevant field.

[0036] Furthermore, the terminology used in the embodiments of the present invention is for describing the embodiments and is not intended to limit the invention.

[0037] In this specification, unless specifically mentioned in the phrase, the singular form may also include the plural form, and when described as “at least one (or one or more) of A and B, C”, it may include one or more of all combinations that can be combined with A, B and C.

[0038] Furthermore, when describing the components of embodiments of the present invention, terms such as first, second, A, B, (a) and (b) may be used.

[0039] These terms are used only to distinguish one component from another, and the nature, order, sequence, etc. of the corresponding components are not limited by these terms.

[0040] Furthermore, when a component is described as being “connected,” “joined,” or “engaged” to another component, this can include not only cases where the component is directly connected, joined, or engaged to another component, but also cases where the component is “connected,” “joined,” or “engaged” to the other component via yet another component between the component and the other component.

[0041] Furthermore, when a component is described as being formed or disposed "above" or "below" another 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 disposed between the two components. Additionally, when expressed as "above or below," the meaning relative to a component can include not only an upward direction but also a downward direction.

[0042] Figure 1 This is a block diagram of a power conversion device according to an embodiment.

[0043] Reference Figure 1 According to the embodiment, the power conversion device 1000 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.

[0044] The power conversion device 1000 can receive power, convert the received power, and output the converted power. The power conversion device 1000 can convert the voltage or current of the received power and output the converted voltage or current. The power conversion device 1000 can convert direct current (DC) power to DC power. The power conversion device 1000 can decrease or increase DC voltage.

[0045] The power conversion device 1000 can receive DC voltage through the input unit 1800. The received voltage can reach the third power conversion unit 1300 through the second power conversion unit 1200, the third connection unit 1600, and the fourth connection unit 1700. 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 connection unit 1400 and the second connection unit 1500. The arriving power can be output from the first power conversion unit through the output unit 1600. The direction of current flow through the power conversion device 1000 is unrestricted; for example, current can be input into the first power conversion unit 1100 and power can be output through the third power conversion unit 1300 and the second power conversion unit 1200.

[0046] Figure 2 This is a block diagram of the first power conversion unit according to an embodiment.

[0047] Reference Figure 1 and Figure 2 The 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 switching unit 1130. The first power conversion unit 1100 can receive power from a first connection unit 1400 and a second connection unit 1500 and convert the voltage or current. The first power conversion unit 1100 can convert the power and output the converted power 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 power. Furthermore, the power transmission direction of the first power conversion unit 1100 is not limited to forward and can be bidirectional or reverse. The first power conversion unit 1100 can implement gain variations for expanding power capacity and expand the range of output voltage and current.

[0048] The 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 electrically connected to both. The first connection unit 1400 and the second connection unit 1500 may receive power from the third power conversion unit 1300 and transmit power to the first power conversion unit 1100. Furthermore, the first connection unit 1400 and the second connection unit 1500 may receive power from the first power conversion unit 1100 and transmit power to the third power conversion unit 1300. Each of the first connection unit 1400 and the second connection unit 1500 may include a first electrode (+) and a second electrode (-). The first electrode (+) and the second electrode (-) may have opposite polarities. The first electrode (+) of the first connection unit 1400 can be connected to point a of the first switching unit 1130 via the first inductor 1110. The second electrode (-) of the first connection unit 1400 can be connected to point c of the first switching unit 1130 via the first inductor 1110. The first electrode (+) of the second connection unit 1500 can be connected to point b of the first switching unit 1130 via the second inductor 1120. The second electrode (-) of the second connection unit 1500 can be connected to point d of the first switching unit 1130 via the second inductor 1120. The power conversion device 1000 can transmit two link voltages to the first power conversion unit 1100 via the first connection unit 1400 and the second connection unit 1500, thereby achieving gain variation for expanding power capacity and the range of output voltage and current.

[0049] A capacitor C can be connected between the first connection unit 1400 and the first inductor 1110, and a capacitor C can also be connected between the second connection unit 1500 and the second inductor 1120. Because capacitors are included between the first connection unit 1400 and the first inductor 1110, and between the second connection unit 1500 and the second inductor 1120, noise and ripple reduction effects are achieved. Furthermore, a capacitor can be connected between the first switching unit 1130 and the output unit 1900. Because a capacitor is included between the first switching unit 1130 and the output unit 1900, noise and ripple reduction effects are also achieved.

[0050] Figure 3 This is a block diagram of the second power conversion unit according to an embodiment.

[0051] Reference Figure 1 and Figure 3 According to an embodiment, the power conversion device 1000 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 switching unit 1230. The second power conversion unit 1200 can receive power from the input unit 1800 and convert the voltage or current. The second power conversion unit 1200 can convert the power and transmit it to a third power conversion unit 1300 via 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 and generates output power. Furthermore, the power transmission direction of the second power conversion unit 1200 is not limited to forward and can be bidirectional or reverse. The second power conversion unit 1200 can achieve gain variations to expand power capacity and expand the range of input voltage and current.

[0052] The power conversion device 1000 of this 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 electrically connected to them. The third connection unit 1600 and the fourth connection unit 1700 may receive power from the second power conversion unit 1200 and transmit power to the third power conversion unit 1300. Furthermore, the third connection unit 1600 and the fourth connection unit 1700 may receive power from the third power conversion unit 1300 and transmit power to the second power conversion unit 1200. Each of the third connection unit 1600 and the fourth connection unit 1700 may include a first electrode (+) and a second electrode (-). The first electrode (+) and the second electrode (-) may have opposite polarities. The first electrode (+) of the third connection unit 1600 can be connected to point a of the second switching unit 1230 via the third inductor 1210. The second electrode (-) of the third connection unit 1600 can be connected to point c of the second switching unit 1230 via the third inductor 1210. The first electrode (+) of the fourth connection unit 1700 can be connected to point b of the second switching unit 1230 via the fourth inductor 1220. The second electrode (-) of the fourth connection unit 1700 can be connected to point d of the second switching unit 1230 via the fourth inductor 1220. The power conversion device 1000 can transmit two link voltages to the third power conversion unit 1300 via the third connection unit 1600 and the second connection unit 1700, thereby achieving gain variation for expanding power capacity and the range of input voltage and current.

[0053] A capacitor C can be connected between the third connection unit 1600 and the third inductor 1210, and a capacitor C can also be connected between the fourth connection unit 1700 and the fourth inductor 1220. Because capacitors are included between the third connection unit 1600 and the third inductor 1210, and between the fourth connection unit 1700 and the fourth inductor 1220, noise and ripple reduction effects are achieved. Furthermore, a capacitor can be connected between the second switching unit 1230 and the input unit 1800. Because a capacitor is included between the second switching unit 1230 and the input unit 1800, noise and ripple reduction effects are also achieved.

[0054] Figure 4 This is a circuit diagram of an inductor according to an embodiment.

[0055] Reference Figures 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 can generate power based on the change in current flowing through them over time. As the current change in the first inductor 1110 and the second inductor 1120 increases, the generated power level can increase. The first inductor 1110 and the second inductor 1120 can generate power in the direction opposite to the current flow direction. The first inductor 1110 and the second inductor 1120 can receive individual power inputs.

[0056] The first inductor 1110 can be connected to the first connection unit 1400. The first inductor 1110 can be connected in series with the first connection unit 1400. The first inductor 1110 can be connected to the first connection unit 1400 and generate power according to changes in the current supplied from the first connection unit 1400. Furthermore, the first inductor 1110 can be connected to the first switching unit 1130. The first inductor 1110 can be electrically connected to the first switching unit 1130 and transmit the output voltage to the first switching unit 1130.

[0057] The second inductor 1120 can be connected to the second connection unit 1500. The second inductor 1120 can be connected in series with the second connection unit 1500. The second inductor 1120 can be connected to the second connection unit 1500 and generate power according to changes in the current supplied from the second connection unit 1500. Furthermore, the second inductor 1120 can be connected to the first switching unit 1130. The second inductor 1120 can be electrically connected to the first switching unit 1130 and transmit the output voltage to the first switching unit 1130.

[0058] Furthermore, 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 can generate power based on the change in current flowing through them over time. As the current change in the third inductor 1210 and the fourth inductor 1220 increases, the generated power level can increase. The third inductor 1210 and the fourth inductor 1220 can generate power in the direction opposite to the current flow direction. The third inductor 1210 and the fourth inductor 1220 can receive individual power inputs.

[0059] The third inductor 1210 can be connected to the third connection unit 1600. The third inductor 1210 can be connected in series with the third connection unit 1600. The third inductor 1210 can be connected to the third connection unit 1600 and generate power according to changes in the current supplied from the third connection unit 1600. Furthermore, the third inductor 1210 can be connected to the second switching unit 1230. The third inductor 1210 can be electrically connected to the second switching unit 1230 and transmit the output voltage to the second switching unit 1230.

[0060] The fourth inductor 1220 can be connected to the fourth connection unit 1700. The fourth inductor 1220 can be connected in series with the fourth connection unit 1700. The fourth inductor 1220 can be connected to the fourth connection unit 1700 and generate power according to changes in the current supplied from the fourth connection unit 1700. Furthermore, the fourth inductor 1220 can be connected to the second switching unit 1230. The fourth inductor 1220 can be electrically connected to the second switching unit 1230 and transmit the output voltage to the second switching unit 1230.

[0061] Reference Figure 4 The inductor according to the embodiment may include a single inductor or multiple inductors. The inductor may include a first inductor 1110, a second inductor 1120, a third inductor 1210, and a fourth inductor 1220.

[0062] Reference Figure 4 In (a), the inductor may include two inductors. In this case, each of the two inductors may be connected to one of the first and second electrodes of the connection unit. (See reference...) Figure 4 In cases (b) and (c) of 4, the inductor may include a single inductor. In this case, the inductor may be connected to either the first or second electrode of the connection unit. (See reference...) Figure 4 (d) The inductor may include a combination of two inductors. In this case, each of the two inductors may be connected to one of the first and second electrodes of the connection unit, and the two inductors may be connected and combined. When the combination of two inductors is included, there may be an effect of reducing the ripple of the inductor current.

[0063] Figure 5 and Figure 6 This is a circuit diagram of the first and second switching units according to an embodiment.

[0064] Reference Figure 2 , Figure 5 and Figure 6The first power conversion unit 1100 may include a first switching unit 1130. The first switching unit 1130 may include multiple switches to allow or block current flow. The first switching unit 1130 may allow or block current flow from the first inductor 1110 and the second inductor 1120, thereby allowing current output to the output unit. Depending on the type of the multiple switches, the first switching unit 1130 may allow current to flow in two directions or allow current to flow in only one direction. The multiple switches may include diodes or semiconductor switches.

[0065] Furthermore, the second power conversion unit 1200 may include a second switching unit 1230. The second switching unit 1230 may include multiple switches to allow or block current flow. The second switching unit 1230 may allow input current flow or block current flow, thereby allowing current to be transmitted to the third inductor 1210 and the fourth inductor 1220. Depending on the type of the multiple switches, the second switching unit 1230 may allow current to flow in two directions or allow current to flow in only one direction. The multiple switches may include diodes or semiconductor switches.

[0066] Reference Figure 5 (a) The first switching unit 1130 may include three switches. The first switching unit 1130 may include first to third switches S1, S2, and S3. The first to third switches S1, S2, and S3 may be sequentially connected in the direction from point a to point d, and the second switch S2 may be located between the first switch S1 and the third switch S3. Furthermore, the first switching unit 1130 may include multiple connection points a, b, c, and 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. (See reference...) Figure 5 (b) The first switching unit 1130 may include a bidirectional switch. In this case, current can flow either from the input unit to the output unit or from the output unit to the input unit. (See reference...) Figure 5 (c) The first switching unit 1130 may include a positive switch. In this case, current can flow in the direction from the input unit to the output unit. (Refer to...) Figure 5 (d) The first switching unit 1130 may include a reverse switch. In this case, current can flow in the direction from the output unit to the input unit. When the first switching unit 1130 includes three switches, namely the first switch to the third switches S1, S2 and S3, there may be an effect that requires a small number of switches.

[0067] Reference Figure 6(a) The first switching unit 1130 may include four switches. The first switching unit 1130 may include first switches to fourth switches S1, S2, S3, and S4. The first switches to fourth switches S1, S2, S3, and S4 may be sequentially connected in the direction from point a to point d. A second switch S2 may be located between the first switch S1 and the third switch S3, and the third switch S3 may be located between the second switch S2 and the fourth switch S4. Furthermore, the first switching unit 1130 may include multiple connection points a, b, c, and 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. Additionally, the first switching unit 1130 may include a first capacitor unit C1 and a second capacitor unit C2. The first capacitor unit C1 may be connected to one side of the first switch S1 and the second switch S2, and the second capacitor unit C2 may be connected to one side of the third switch S3 and the fourth switch S4. The first capacitor unit C1 and the second capacitor unit C2 may include capacitors. The first capacitor unit C1 and the second capacitor unit C2 may have the effect of suppressing voltage spikes from the first to the fourth switches S1, S2, S3, and S4. (Refer to...) Figure 6 (b) The first switching unit 1130 may include a bidirectional switch. In this case, current can flow either from the input unit to the output unit or from the output unit to the input unit. (See reference...) Figure 6 (c) The first switching unit 1130 may include a positive switch. In this case, current can flow in the direction from the input unit to the output unit. (Refer to...) Figure 6 (d) The first switching unit 1130 may include a reverse switch. In this case, current can flow in the direction from the output unit to the input unit. When the first switching unit 1130 includes four switches, namely the first to the fourth switches S1, S2, S3 and S4, there may be an effect of reducing the withstand voltage required for the switches.

[0068] In addition, the second switching unit 1230 may include a fifth to an eighth switch. Figure 5 and Figure 6 The configuration of the first switch unit 1130 shown can be applied in the same way to the second switch unit 1230. In this case, the first switch unit 1130 can correspond to the second switch unit 1230, and the first to fourth switches S1, S2, S3 and S4 can correspond to the fifth to eighth switches, respectively.

[0069] Figures 7a to 7d This is a circuit diagram of the first power conversion unit according to an embodiment.

[0070] Figures 7a to 7d The diagram illustrates a first switching unit 1130 comprising three switches, namely, switches S1, S2, and S3. A capacitor C may be disposed between the first switching unit 1130 and the output unit 1900.

[0071] Reference Figure 7a The first inductor 1110 can be connected to the second electrode (-) of the first connection unit 1400, and the second inductor 1120 can be connected to the first electrode (+) of the second connection unit 1500. In this case, the first inductor 1110 and the second inductor 1120 can each include one inductor. The first inductor 1110 can be connected to point c between the second switch S2 and the third switch S3. The second inductor 1120 can be connected to point b between the first switch S1 and the second switch S2.

[0072] Reference Figure 7b The first inductor 1110 can be connected to the first electrode (+) of the first connection unit 1400, and the second inductor 1120 can be connected to the second electrode (-) of the second connection unit 1500. In this case, the first inductor 1110 and the second inductor 1120 can each include one inductor. The first inductor 1110 can be connected to point a between the first switch S1 and the first electrode (+) of the first connection unit 1400. The second inductor 1120 can be connected to point d between the third switch S3 and the second electrode (-) of the second connection unit 1500.

[0073] Reference Figure 7c The first inductor 1110 and the second inductor 1120 may each include two inductors. Each of the two inductors may be connected to one of the first electrode (+) and the second electrode (-) of the first connection unit 1400 and the second connection unit 1500. Furthermore, the two inductors of the first inductor 1110 and the two inductors of the second inductor 1120 may be combined with each other. When the two inductors are combined, there is an effect of reducing the ripple of the inductor current. One inductor of the first inductor 1110 may be connected to point a between the first switch S1 and the first electrode (+) of the first connection unit 1400, and the other inductor may be connected to point c between the second switch S2 and the third switch S3. Similarly, one inductor of the second inductor 1120 may be connected to point d between the third switch S3 and the second electrode (-) of the second connection unit 1500, and the other inductor may be connected to point b between the first switch S1 and the second switch S2.

[0074] Reference Figure 7dThe first inductor 1110 can be connected to the second electrode (-) of the first connection unit 1400, and the second inductor 1120 can be connected to the first electrode (+) of the second connection unit 1500. In this case, the first inductor 1110 and the second inductor 1120 can each include one inductor. The first inductor 1110 can be connected to point c between the second switch S2 and the third switch S3. The second inductor 1120 can be connected to point b between the first switch S1 and the second switch S2. Furthermore, the first inductor 1110 and the second inductor 1120 can be combined with each other. When the two inductors are combined, there is an effect of reducing the ripple of the inductor current.

[0075] Figures 7a to 7b The construction of the first power conversion unit 1100 shown can be similarly applied to the second power conversion unit. In this case, the first inductor 1110 can correspond to the third inductor, the second inductor 1120 can correspond to the fourth inductor, the first connection unit 1400 can correspond to the third connection unit, the second connection unit 1500 can correspond to the fourth connection unit, and the first to third switches S1, S2 and S3 can correspond to the fifth to seventh switches, respectively.

[0076] Figures 8a to 8d This is a circuit diagram of a first power conversion unit according to another embodiment.

[0077] Figures 8a to 8d The diagram illustrates a first switching unit 1130 comprising four switches, namely, first switches to fourth switches S1, S2, S3, and S4. A first capacitor unit C1 may be disposed between the first switch S1 and the second switch S2 and the output unit 1600, and a second capacitor unit C2 may be disposed between the third switch S3 and the fourth switch S4 and the output unit 1600.

[0078] Reference Figure 8a The first inductor 1110 can be connected to the second electrode (-) of the first connection unit 1400, and the second inductor 1120 can be connected to the first electrode (+) of the second connection unit 1500. In this case, the first inductor 1110 and the second inductor 1120 can each include one inductor. The first inductor 1110 can be connected to point c between the third switch S3 and the fourth switch S4. The second inductor 1120 can be connected to point b between the first switch S1 and the second switch S2.

[0079] Reference Figure 8bThe first inductor 1110 can be connected to the first electrode (+) of the first connection unit 1400, and the second inductor 1120 can be connected to the second electrode (-) of the second connection unit 1500. In this case, the first inductor 1110 and the second inductor 1120 can each include one inductor. The first inductor 1110 can be connected to point a between the first switch S1 and the first electrode (+) of the first connection unit 1400. The second inductor 1120 can be connected to point d between the fourth switch S4 and the second electrode (-) of the second connection unit 1500.

[0080] Reference Figure 8c The first inductor 1110 and the second inductor 1120 may each include two inductors. Each of the two inductors may be connected to one of the first electrode (+) and the second electrode (-) of the first connection unit 1400 and the second connection unit 1500. Furthermore, the two inductors of the first inductor 1110 and the two inductors of the second inductor 1120 may be combined with each other. When the two inductors are combined, there is an effect of reducing the ripple of the inductor current. One inductor of the first inductor 1110 may be connected to point a between the first switch S1 and the first electrode (+) of the first connection unit 1400, and the other inductor may be connected to point c between the third switch S3 and the fourth switch S4. Similarly, one inductor of the second inductor 1120 may be connected to point d between the fourth switch S4 and the second electrode (-) of the second connection unit 1500, and the other inductor may be connected to point b between the first switch S1 and the second switch S2.

[0081] Reference Figure 8d The first inductor 1110 can be connected to the second electrode (-) of the first connection unit 1400, and the second inductor 1120 can be connected to the first electrode (+) of the second connection unit 1500. In this case, the first inductor 1110 and the second inductor 1120 can each include one inductor. The first inductor 1110 can be connected to point c between the third switch S3 and the fourth switch S4. The second inductor 1120 can be connected to point b between the first switch S1 and the second switch S2. Furthermore, the first inductor 1110 and the second inductor 1120 can be combined with each other. When the two inductors are combined, there is an effect of reducing the ripple of the inductor current.

[0082] Figures 8a to 8bThe construction of the first power conversion unit 1100 shown can be similarly applied to the second power conversion unit. In this case, the first inductor 1110 can correspond to the third inductor, the second inductor 1120 can correspond to the fourth inductor, the first connection unit 1400 can correspond to the third connection unit, the second connection unit 1500 can correspond to the fourth connection unit, and the first to fourth switches S1, S2, S3 and S4 can correspond to the fifth to eighth switches, respectively.

[0083] Figures 9a to 9c This is a block diagram of the third power conversion unit according to an embodiment.

[0084] Reference Figure 1 and Figures 9a to 9c According to the embodiment, the power conversion device 1000 may include a third power conversion unit 1300.

[0085] The third power conversion unit 1300 can receive power from the second power conversion unit 1200, generate two power outputs, and transmit these two power outputs to the first power conversion unit 1100. The third power conversion unit 1300 can also receive power from the second power conversion unit 1200. A third connection unit 1600 and a fourth connection unit 1700 can be disposed between the third power conversion unit 1300 and the second power conversion unit 1200, and the third power conversion unit 1300 can receive power from both the third connection unit 1600 and the fourth connection unit 1700. Furthermore, the third power conversion unit 1300 can transmit power to the first power conversion unit 1100. A first connection unit 1400 and a second connection unit 1500 can be disposed between the third power conversion unit 1300 and the first power conversion unit 1100, and the third power conversion unit 1300 can transmit power through the first connection unit 1400 and the second connection unit 1500. The third power conversion unit 1300 can be electrically connected to the first to fourth connection units 1400, 1500, 1600 and 1700.

[0086] The third power conversion unit 1300 may include a single power conversion unit or multiple power conversion units. When the third power conversion unit 1300 includes multiple power conversion units, it may include multiple switching units, which may be connected in series, in parallel, or in a series-parallel connection. The single or multiple power conversion units included in the third power conversion unit 1300 may generate one or two link voltages and transmit these one or two link voltages to the first connection unit 1400 and the second connection unit 1500. A unidirectional converter may be used as the third power conversion unit 1300 and may include, for example, a resonant inductor-inductor-capacitor (LLC) converter and a phase-shifted full-bridge (PSFB) converter. Furthermore, a bidirectional converter may be used as the third power conversion unit 1300 and may include, for example, a resonant capacitor-inductor-inductor-capacitor (CLLC) converter, a resonant capacitor-inductor-inductor-capacitor (CLLLC) converter, and a dual active bridge (DAB).

[0087] Reference Figure 9a The third power conversion unit 1300 may include a single power conversion unit. In this case, the single power conversion unit can receive power from the third connection unit 1600 and the fourth connection unit 1700, generate two link outputs, and transmit the two link power outputs to the first connection unit 1400 and the second connection unit 1500.

[0088] Reference Figure 9b The third power conversion unit 1300 may include two power conversion units. These two power conversion units may be connected in parallel to the third connection unit 1600 and the fourth connection unit 1700. In this case, the two power conversion units can generate a link power output and each transmit power to the first connection unit 1400 and the second connection unit 1500. Furthermore, in another embodiment, each of the two power conversion units can transmit power to both the first connection unit 1400 and the second connection unit 1500 (not shown). When multiple power conversion units are connected in parallel as described above, the load can be distributed, thereby reducing the current stress on the third power conversion unit 1300 and facilitating heat management.

[0089] Reference Figure 9cThe third power conversion unit 1300 may include two power conversion units. These two power conversion units may be connected in series to the third connection unit 1600 and the fourth connection unit 1700. In this case, each power conversion unit may independently deliver power to both the first connection unit 1400 and the second connection unit 1500. Alternatively, in another embodiment, each power conversion unit may independently deliver power to both the first connection unit 1300 and the second connection unit 1500 (not shown). When multiple power conversion units are connected in series as described above, the voltage stress on the second switching unit can be reduced, thereby providing the effect of allowing the use of switches with lower withstand voltages.

[0090] Furthermore, in another embodiment, multiple power conversion units can be connected in series-parallel to the input unit (not shown). Each of the multiple power conversion units can transfer power to both the first connection unit and the second connection unit, or can transfer power to either the first connection unit or the second connection unit. In this case, current stress can be reduced, and voltage stress on the second switching unit can be decreased. Therefore, it is possible to achieve a high capacity while applying SiC metal-oxide-semiconductor field-effect transistors (MOSFETs).

[0091] Figures 10 and 11 are circuit diagrams of the third switching unit according to an embodiment.

[0092] Referring to Figures 10 and 11, the third power conversion unit according to the embodiment may include a third switching unit 1310.

[0093] The third switching unit 1310 can receive power from the third connection unit 1600 and the fourth connection unit 1700.

[0094] Figure 10a The diagram illustrates the case where the third switching unit is a two-level full-bridge. In this case, the third switching unit may include four switches. Figure 10b and 10c The diagram illustrates the case where the third switching unit is a two-level half-bridge. In this case, the third switching unit may include two switches.

[0095] Figure 11a The diagram illustrates a case where the third switching unit is a three-level full-bridge circuit. In this case, the third switching unit can include 12 switches. Figure 11b The diagram illustrates a case where the third switching unit is a three-level half-bridge. In this case, the third switching unit can include six switches. Furthermore, the third switching unit can include two capacitors.

[0096] Figures 12 to 14 are circuit diagrams of the third and fourth switching units according to the embodiments.

[0097] Referring to Figures 12 to 14, the third power conversion unit according to the embodiment may further include a fourth switching unit 1320. The fourth switching unit 1320 may be connected in series or in parallel to the third switching unit 1310. The fourth switching unit 1320 may have the same configuration as the third switching unit 1310. The fourth switching unit 1320 may receive power from the third connection unit 1600 and the fourth connection unit 1700. The third switching unit 1310 and the fourth switching unit 1320 may each supply power to the first connection unit 1300 or the second connection unit 1400, or may simultaneously supply power to both the first connection unit 1300 and the second connection unit 1400.

[0098] Figures 12a to 12c The third power conversion unit according to the embodiment is shown to be a two-level full-bridge. Figure 12a The diagram shows the third switch unit 1310 and the fourth switch unit 1320 connected in parallel. Figure 12b This illustrates the case where the third switch unit 1310 and the fourth switch unit 1320 are connected in series. Figure 12c The diagram shows the third switch unit 1310 and the fourth switch unit 1320 connected in series and parallel.

[0099] Figures 13a to 13c The third power conversion unit according to the embodiment is shown to be a two-level half-bridge. Figure 13a The diagram shows the third switch unit 1310 and the fourth switch unit 1320 connected in parallel. Figure 13b This illustrates the case where the third switch unit 1310 and the fourth switch unit 1320 are connected in series. Figure 13c The diagram shows the third switch unit 1310 and the fourth switch unit 1320 connected in series and parallel.

[0100] Figures 14a to 14c The third power conversion unit according to another embodiment is shown as a two-level half-bridge. Figure 14a The diagram shows the third switch unit 1310 and the fourth switch unit 1320 connected in parallel. Figure 14b This illustrates the case where the third switch unit 1310 and the fourth switch unit 1320 are connected in series. Figure 14c The diagram shows the third switch unit 1310 and the fourth switch unit 1320 connected in series and parallel.

[0101] Figure 15 This is a circuit diagram of a transformer unit according to an embodiment.

[0102] Reference Figure 15According to an embodiment, the third power conversion unit may include a transformer unit 1330. The transformer unit 1330 can receive power and convert voltage. The transformer unit 1330 can be connected to the second switching unit. The transformer unit 1330 can be disposed between the second switching unit and the first and second connection units.

[0103] Figure 15 (a) shows a transformer unit 1330 in which the third power conversion unit according to the embodiment transmits power to a connection unit via a switching unit. When the third power conversion unit includes a third switching unit and a fourth switching unit, and the third switching unit and the fourth switching unit are connected in series or in parallel, the third switching unit and the fourth switching unit can each be connected to a transformer unit 1330.

[0104] Figure 15 (b) and Figure 15 (c) shows a transformer unit in which the third power conversion unit according to the embodiment transmits power to two connection units through a switching unit. Figure 15 The transformer unit of (b) includes a transformer and can be connected with a center tap structure. Figure 15 The transformer unit of (c) includes two transformers, and the transformers can be connected in series on the primary side (the side adjacent to the input unit). When the third power conversion unit includes a third switching unit and the third switching unit transmits power to the first connection unit and the second connection unit, the transformer unit can be connected to the first connection unit and the second connection unit.

[0105] Figure 16a and Figure 16b This is a circuit diagram of a power conversion device according to an embodiment.

[0106] Reference Figure 16a and Figure 16bThe third power conversion unit 1300 may include a fifth inductor 1340 and a fifth capacitor unit 1350. The fifth inductor 1340 and the fifth capacitor unit 1350 may be disposed between the third switching unit 1310, the fourth switching unit 1320, and the first transformer unit 1330. The third power conversion unit 1300 may include the fifth inductor 1340 to achieve zero-voltage switching (ZVS). Furthermore, 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 unit 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. Furthermore, the third power conversion unit 1300 may include a sixth inductor 1341, a sixth capacitor unit 1351, and a second transformer unit 1331. The sixth inductor 1341 and the sixth capacitor unit 1351 may be disposed between the fourth switching unit 1320 and the second transformer unit 1331.

[0107] Figure 16a This is a circuit diagram of the power conversion device according to the first embodiment.

[0108] Reference Figure 16a The third power conversion unit 1300 can generate two second-link power outputs from two first-link power inputs using a resonant LLC converter, and the first power conversion unit 1100 and the second power conversion unit 1200 can each include four switches. The first power conversion unit 1100 can include a first inductor 1110, a second inductor 1120, and a first switching unit 1130. The first switching unit 1130 can include first switches to fourth switches S1, S2, S3, and S4. The first inductor 1110 can be connected to the second electrode (-) of the first connection unit 1400, and the second inductor 1120 can be connected to the first electrode (+) of the second connection unit 1500. A capacitor can be included between the first inductor 1110 and the first connection unit 1400, and a capacitor can be included between the second inductor 1120 and the second connection unit 1500. The first inductor 1110 and the second inductor 1120 can each include one inductor. The first inductor 1110 can be connected to point c between the third switch S3 and the fourth switch S4. The second inductor 1120 can be connected to point b between the first switch S1 and the second switch S2. The first capacitor unit C1 and the second capacitor unit C2 can be disposed between the first switch unit 1130 and the output unit 1900.

[0109] The second power conversion unit 1200 may include a third inductor 1210, a fourth inductor 1220, and a second switching unit 1230. The second switching unit 1230 may include fifth to eighth switches S5, S6, S7, and 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. A capacitor may be included between the third inductor 1210 and the third connection unit 1600, and a capacitor may be included between the fourth inductor 1220 and the fourth connection unit 1700. The third inductor 1210 and the fourth inductor 1220 may each include one inductor. The third inductor 1210 may be connected to point c between the seventh switch S7 and the eighth switch S8. The fourth inductor 1220 may be connected to point b between the fifth switch S5 and the sixth switch S6. The third capacitor unit C3 and the fourth capacitor unit C4 can be located between the second switch unit 1230 and the input unit 1800.

[0110] The third power conversion unit 1300 may include a third switching unit 1310, a fourth switching unit 1320, a fifth inductor 1340, a sixth inductor 1341, a fifth capacitor unit 1350, a sixth capacitor 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 a first connection unit 1400. The second rectifier circuit 1370 may be connected to a 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 to the first transformer unit 1330 and the second transformer unit 1331. The fifth inductor 1340 may be disposed between the third switching unit 1310 and the fifth capacitor unit 1350. The fifth capacitor unit 1350 can be disposed between the fifth inductor 1340 and the first transformer unit 1330. The first transformer unit 1330 can be disposed between the fifth capacitor unit 1350 and the first rectifier circuit 1360 and the second rectifier circuit 1370. The third switching unit 1310 can include four switches. The third switching unit 1310 can be connected to the third connection unit 1600. The sixth inductor 1341 can be disposed between the fourth switching unit 1320 and the sixth capacitor unit 1351. The sixth capacitor unit 1351 can be disposed between the sixth inductor 1341 and the second transformer unit 1331. The second transformer unit 1331 can be disposed between the sixth capacitor unit 1351 and the first rectifier circuit 1360 and the second rectifier circuit 1370. The fourth switching unit 1320 can include four switches. The fourth switching unit 1320 can be connected to the fourth connection unit 1700. The first transformer unit 1330 and the second transformer unit 1331 can each include two transformers. The first transformer unit 1330 and the second transformer unit 1331 may each have two transformers connected to them.

[0111] Figure 16b This is a circuit diagram of the power conversion device according to the first embodiment.

[0112] Reference Figure 16bThe third power conversion unit 1300 can use a DAB converter capable of bidirectional power transmission to generate two second-link power outputs from two first-link power inputs, and the first power conversion unit 1100 and the second power conversion unit 1200 can each include four switches. The first power conversion unit 1100 can include a first inductor 1110, a second inductor 1120, and a first switching unit 1130. The first switching unit 1130 can include first switches to fourth switches S1, S2, S3, and S4. The first inductor 1110 can be connected to the second electrode (-) of the first connection unit 1400, and the second inductor 1120 can be connected to the first electrode (+) of the second connection unit 1500. A capacitor can be included between the first inductor 1110 and the first connection unit 1400, and a capacitor can be included between the second inductor 1120 and the second connection unit 1500. The first inductor 1110 and the second inductor 1120 can each include one inductor. The first inductor 1110 can be connected to point c between the third switch S3 and the fourth switch S4. The second inductor 1120 can be connected to point b between the first switch S1 and the second switch S2. The first capacitor unit C1 and the second capacitor unit C2 can be disposed between the first switch unit 1130 and the output unit 1900.

[0113] The second power conversion unit 1200 may include a third inductor 1210, a fourth inductor 1220, and a second switching unit 1230. The second switching unit 1230 may include fifth to eighth switches S5, S6, S7, and 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. A capacitor may be included between the third inductor 1210 and the third connection unit 1600, and a capacitor may be included between the fourth inductor 1220 and the fourth connection unit 1700. The third inductor 1210 and the fourth inductor 1220 may each include one inductor. The third inductor 1210 may be connected to point c between the seventh switch S7 and the eighth switch S8. The fourth inductor 1220 may be connected to point b between the fifth switch S5 and the sixth switch S6. The third capacitor unit C3 and the fourth capacitor unit C4 can be located between the second switch unit 1230 and the input unit 1800.

[0114] The third power conversion unit 1300 may include a third switching unit 1310, a fourth switching unit 1320, a fifth inductor 1340, a sixth inductor 1341, a fifth capacitor unit 1350, a sixth capacitor 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 a first connection unit 1400. The second rectifier circuit 1370 may be connected to a second connection unit 1500. Each of the first rectifier circuit 1360 and the second rectifier circuit 1370 may include four switches. The first rectifier circuit 1360 may be connected to the first transformer unit 1330. The second rectifier circuit 1370 may be connected to the second transformer unit 1331. The first rectifier circuit 1360 and the second rectifier circuit 1370 may be connected in series. The fifth inductor 1340 may be disposed between the third switching unit 1310 and the fifth capacitor unit 1350. The fifth capacitor unit 1350 can be disposed between the fifth inductor 1340 and the first transformer unit 1330. The first transformer unit 1330 can be disposed between the fifth capacitor unit 1350 and the first rectifier circuit 1360 and the second rectifier circuit 1370. The third switching unit 1310 can include four switches. The third switching unit 1310 can be connected to the third connection unit 1600. The sixth inductor 1341 can be disposed between the fourth switching unit 1320 and the sixth capacitor unit 1351. The sixth capacitor unit 1351 can be disposed between the sixth inductor 1341 and the second transformer unit 1331. The second transformer unit 1331 can be disposed between the sixth capacitor unit 1351 and the first rectifier circuit 1360 and the second rectifier circuit 1370. The fourth switching unit 1320 can include four switches. The fourth switching unit 1320 can be connected to the fourth connection unit 1700. The first transformer unit 1330 and the second transformer unit 1331 can each include a transformer.

[0115] Figure 17 is a circuit diagram showing the power conversion device in the first mode, and Figure 18 is a circuit diagram showing the power conversion device in the second mode.

[0116] Referring to Figures 17 and 18, the first power conversion unit of the power conversion device according to the 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 uses a bypass mode that does not perform repeated switching to realize power transfer between the input and the output. The power conversion device can have the effect of realizing power transfer using both the first and second modes while minimizing switching losses.

[0117] Figure 17aThe diagram illustrates a first mode state where the first switching 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 can be the sum of the voltages of the power inputs from the first connection unit 1300 and the second connection unit 1400 to the first power conversion unit. When the first power conversion unit 1100 is in the first mode, the first switch S1 and the third switch S3 can be in the off state, and the second switch S2 can be in the on state.

[0118] Figure 17b The diagram illustrates a first mode state where the first switching 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 can be the sum of the voltages of the power inputs from the first connection unit 1300 and the second connection unit 1400 to the first power conversion unit. When the first power conversion unit 1100 is in the first mode, the first switch S1 and the fourth switch S4 can be in the off state, and the second switch S2 and the third switch S3 can be in the on state.

[0119] Figure 18a The diagram illustrates a second mode state where the first switching 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 can be the sum of the currents from the first connection unit 1300 and the second connection unit 1400 to the power input to the first power conversion unit. When the first power conversion unit 1100 is in the second mode, the first switch S1 and the third switch S3 can be in a conducting state, and the second switch S2 can be in a disconnected state.

[0120] Figure 18b The diagram illustrates a second mode state where the first switching 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 can be the sum of the currents from the first connection unit 1300 and the second connection unit 1400 to the power input to the first power conversion unit. When the first power conversion unit 1100 is in the second mode, the first switch S1 and the fourth switch S4 can be in a conducting state, and the second switch S2 and the third switch S3 can be in a disconnected state.

[0121] Figure 19 is an image showing the drive of each switch when the power conversion device is in the third mode.

[0122] Referring to FIG19, 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 of repeatedly switching the first switching unit of the first power conversion unit. The power conversion device uses the third mode to achieve a gain change for power capacity expansion. Each switch of the first switching unit of the first power conversion unit can be in an on or off state.

[0123] Figure 19a This is an image showing the operation according to a third switching mode when the first switching unit of the first power conversion unit includes three switches S1, S2, and S3. (Refer to...) Figure 19a When the second switch S2 is in the ON state, the first switch S1 and the third switch S3 can be in the OFF state. Conversely, when the second switch S2 is in the OFF state, the first switch S1 and the third switch S3 can be in the ON state. The entire cycle of one state transition for each of the second switch S2, the first switch S1, and the third switch S3 can be the switching period Ts. The ratio of the period of the second switch S2 to the switching period Ts can be the duty cycle D, and can have a value ranging from 0 to 100 (0% to 100%).

[0124] Figure 19b and Figure 19c This is an image showing the third switching mode being driven when the first switching unit of the first power conversion unit includes four switches S1, S2, S3 and S4. Figure 18a Figure 18c illustrates the drive according to the third mode in the case of synchronization without a phase difference. Figure 18c illustrates the drive according to the third mode in the case of interleaved scheme with a phase difference.

[0125] Reference Figure 19b When the second switch S2 is in the ON state, the first switch S1 can be in the OFF state. Furthermore, when the second switch S2 is in the OFF state, the first switch S1 can be in the ON state. Furthermore, when the third switch S3 is in the ON state, the fourth switch S4 can be in the OFF state. Furthermore, when the third switch S3 is in the OFF state, the fourth switch S4 can be in the ON state. Furthermore, the drive states of the second switch S2 and the third switch S3 can be the same. Furthermore, the drive states of the first switch S1 and the fourth switch S4 can 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 can be the switching period Ts. The ratio of the period of the second switch S2 or the third switch S3 to the switching period Ts can be the duty cycle D, and can have a value ranging from 0 to 1 (0% to 100%).

[0126] Reference Figure 19c When the second switch S2 is in the ON state, the first switch S1 can be in the OFF state. Furthermore, when the second switch S2 is in the OFF state, the first switch S1 can be in the ON state. Furthermore, when the third switch S3 is in the ON state, the fourth switch S4 can be in the OFF state. Furthermore, when the third switch S3 is in the OFF state, the fourth switch S4 can be in the ON state. 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 can be the switching period Ts. The ratio of the period of the second switch S2 to the switching period Ts can be a first duty cycle D1, and can have a value ranging from 0 to 1 (0% to 100%). Furthermore, the ratio of the period of the third switch S3 to the switching period Ts can be a second duty cycle D2, and can have a value ranging from 0% to 100%. In this case, the first duty cycle D1 and the second duty cycle D2 can be the same. The switching periods Ts of the second switch S2 and the first switch S1, as well as the switching periods Ts of the third switch S3 and the fourth switch S4, can have a phase shift Φ. shift And phase shift Φ shift It can have values ​​ranging from 0° to 360°.

[0127] In the third mode, the input voltage of the input unit and the output voltage of the output unit can be as shown in Equation 1.

[0128] [Equation 1]

[0129] Here, V out The output voltage, V, from the first power conversion unit to the output unit. in1 and V in2 These are the input voltages from the first connection unit and the second connection unit, respectively, and D can be the duty cycle.

[0130] In the third mode, the input current of the input unit and the output current of the output unit can be as shown in Equation 2.

[0131] [Equation 2]

[0132] Here, I out The output power from the first power conversion unit to the output unit, I in1 and I in2 These are the input currents from the first connection unit and the second connection unit, respectively, and D can be the duty cycle.

[0133] Since D in Equations 1 and 2 has values ​​ranging from 0 to 1, therefore Vout and I out Each can have a range from the sum of voltages (V) in1 +V in2 The value or range is 0.5 to 1.0 times the sum of the currents of the two input units (I). in1 +I in2 0.5 to 1.0 times the value of ).

[0134] 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 mode and the second mode, it is possible to achieve continuous output voltage and output current.

[0135] Although embodiments have been primarily described above, these are merely examples and do not limit the invention. Those skilled in the art will understand that various modifications and applications not illustrated above are possible without departing from the essential characteristics of these embodiments. For example, each component specifically shown in the embodiments can be implemented by modification. Differences associated with such modifications and applications should be interpreted as including within the scope of the invention as defined in the appended claims.

Claims

1. A power conversion device, comprising: The first power conversion unit includes a first inductor, a second inductor, and a first switching unit; The second power conversion unit includes a third inductor, a fourth inductor, and a second switching unit. A first connection unit and a second connection unit are connected to the first power conversion unit; A third connection unit and a fourth connection unit are connected to the second power conversion unit; as well as A third power conversion unit is connected to the first connection unit, the second connection unit, the third connection unit, and the fourth connection unit. 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.

2. The power conversion equipment according to claim 1, wherein, The first connection unit includes a first electrode and a second electrode with opposite polarities, and The first inductor is connected to either the first electrode or the second electrode.

3. The power conversion equipment according to claim 2, wherein, The second connection unit includes a first electrode and a second electrode with opposite polarities, and The second inductor is connected to either the first electrode or the second electrode.

4. The power conversion equipment according to claim 3, wherein, Each of the third and fourth connection units includes a first electrode and a second electrode with opposite polarities. The third inductor is connected to either the first electrode or the second electrode of the third connection unit. The fourth inductor is connected to either the first electrode or the second electrode of the fourth connection unit, and The third inductor and the fourth inductor are respectively connected to the opposite electrodes of the third connection unit and the fourth connection unit.

5. The power conversion device according to claim 4, wherein, The first inductor and the third inductor are respectively connected to the same electrode of the first connection unit and the third connection unit.

6. The power conversion device according to claim 4, wherein, The second inductor and the fourth inductor are respectively connected to the same electrode of the second connection unit and the fourth connection unit.

7. The power conversion device according to claim 1 further includes an input unit for receiving power and an output unit for outputting power. in, The second switch unit is connected to the input unit, and The first switching unit is connected to the output unit.

8. The power conversion device according to claim 1, wherein, The third power conversion unit receives two power inputs and outputs two power outputs.

9. The power conversion device according to claim 8, wherein, The third power conversion unit includes a third switching unit and a fourth switching unit. The third switch unit is connected to the third connection unit, and The fourth switch unit is connected to the fourth connection unit.

10. The power conversion device according to claim 9, wherein, The third power conversion unit includes a first transformer unit connected to the third switching unit and a second transformer unit connected to the fourth switching unit.

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