Power converter and power conversion system
By employing a multi-pole switching structure and stacked design in the power converter, the problems of increased power converter size and cost are solved, achieving higher power density and lower design cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUNGROW POWER SUPPLY CO LTD
- Filing Date
- 2026-04-09
- Publication Date
- 2026-07-07
Smart Images
Figure CN122348660A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of power electronics technology, and in particular to a power converter and a power conversion system. Background Technology
[0002] Multiple switches can be set on one side of the power converter to connect to the corresponding branches, thereby realizing multiple branch access. Since the switches need to occupy a certain space, the power converter with a large number of connected branches will have an increased size, which will lead to the size design bottleneck of the power converter, resulting in a lower power density and an increase in the cost of the power converter. Summary of the Invention
[0003] In view of the above problems, this disclosure provides a power converter and a power conversion system to improve power density and reduce cost. The specific solution is as follows:
[0004] The first aspect of this disclosure provides a power converter, comprising: a conversion circuit and at least one multi-pole switch; wherein...
[0005] The second side of the conversion circuit is connected to the second side of the power converter;
[0006] The first side of the conversion circuit is connected to the second side of the multi-pole switch, and the first side of the multi-pole switch is connected to at least two interfaces on the first side of the power converter; each interface on the first side of the power converter is used to connect to a corresponding branch power conversion device through a corresponding branch, and the other side of the branch power conversion device is used to connect to the first power supply unit.
[0007] The multi-pole switch includes at least three conductive loops to enable the connection of at least two of the branches.
[0008] In one possible implementation, at least two conductive loops are stacked in all the conductive loops of the multi-pole switch.
[0009] In one possible implementation, the multi-pole switch is a DC switch; in the DC switch, each conductive loop connected to the positive terminal of different branches is distributed on the same layer, and each conductive loop connected to the negative terminal of different branches is distributed on the same layer.
[0010] In one possible implementation, the conductive loops connected to the same branch are distributed in the same layer.
[0011] In one possible implementation, the multi-pole switch has at least two conductive loops connected in parallel inside or outside the second side of the multi-pole switch.
[0012] In one possible implementation, among the branches connected to the multi-pole switch, at least two branches share the same conductive loop.
[0013] In one possible implementation, the power converter further includes: multiple overcurrent protection devices;
[0014] Each of the second-side interfaces of the multi-pole switch is connected to the first side of the conversion circuit through the corresponding overcurrent protection device.
[0015] In one possible implementation, the power converter further includes a coupling side, wherein each interface of the coupling side is connected between each interface of the second side of the multi-pole switch and the corresponding overcurrent protection device, and each interface of the coupling side is used to connect to the corresponding coupling power transmission device.
[0016] A second aspect of this disclosure provides a power conversion system, comprising: at least one power converter as described in the first aspect or any implementation thereof, and at least two branch power conversion devices;
[0017] The first side of the branch power conversion device is used to connect to the first power supply unit;
[0018] The second side of the branch power conversion device is connected to the corresponding branch interface of the first side of the power converter.
[0019] In one possible implementation, the power conversion system further includes at least two coupled power transmission devices;
[0020] The first side of the coupled power transmission device is used to connect to the second power supply unit;
[0021] The second side of the coupled power transmission device is connected to the corresponding interface of the coupling side of the power converter.
[0022] In one possible implementation, the conversion circuit in the power converter is a DC / AC conversion circuit;
[0023] The DC side of the DC / AC conversion circuit is the first side of the conversion circuit, and the AC side of the DC / AC conversion circuit is the second side of the conversion circuit.
[0024] In one possible implementation, the branch power conversion device is a DC / DC converter, and the first power supply unit is a photovoltaic unit.
[0025] In one possible implementation, the coupled power transmission device is a bidirectional DC / DC converter, and the second power supply unit is a battery unit.
[0026] The power converter disclosed herein has at least one multi-pole switch connected to the first side of its conversion circuit. The multi-pole switch includes at least three conductive loops to enable the connection of at least two branch power conversion devices. That is, the multi-pole switch in this power converter increases the number of connected branches, allowing more branches to be connected when the power converter size is limited, thereby increasing the power density of the power converter and reducing design costs. Attached Figure Description
[0027] The features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and elements and actual parts are not necessarily drawn to scale.
[0028] Figure 1 A schematic diagram of a power conversion system provided for a traditional solution;
[0029] Figure 2 This is a schematic diagram of a first structure of a power conversion system provided in an embodiment of the present disclosure;
[0030] Figure 3 A schematic diagram of a multi-pole switch in a power conversion system provided in an embodiment of this disclosure;
[0031] Figure 4 This is a schematic diagram of a second specific structure of the power conversion system provided in an embodiment of the present disclosure;
[0032] Figure 5 This is a schematic diagram of a third specific structure of the power conversion system provided in the embodiments of this disclosure;
[0033] Figure 6 This is a schematic diagram of a fourth specific structure of the power conversion system provided in the embodiments of this disclosure;
[0034] Figure 7 In order to be in Figure 6 The diagram shows a structural schematic of a multi-pole switch in a power conversion system based on the structure shown.
[0035] Figure 8 This is a fifth specific structural schematic diagram of the power conversion system provided in the embodiments of this disclosure;
[0036] Figure 9 This is a sixth specific structural schematic diagram of the power conversion system provided in the embodiments of this disclosure;
[0037] Figure 10 This is a seventh specific structural diagram of the power conversion system provided in the embodiments of this disclosure. Detailed Implementation
[0038] The embodiments of this disclosure are described below with reference to the accompanying drawings. The terminology used in the Description of Embodiments section of this disclosure is for illustrative purposes only and is not intended to limit the scope of this disclosure.
[0039] The embodiments of this disclosure are described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure. Those skilled in the art will understand that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of this disclosure are also applicable to similar technical problems.
[0040] The terms “first,” “second,” etc., used in this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the description of embodiments of this disclosure. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of units is not necessarily limited to those units, but may include other units not expressly listed or inherent to those processes, methods, products, or apparatuses.
[0041] Figure 1 The structure of the power conversion system is shown using an inverter system as an example. Each DC / DC converter 01 is connected to the DC switch QS on the DC side of the DC / AC converter 02. Due to the size limitation of the DC switch QS, the size of the DC / AC converter 02 needs to be increased accordingly when multiple DC / DC converters 01 are connected, which brings size design bottleneck and increased cost to the DC / AC converter 02.
[0042] Therefore, this disclosure provides a power converter to improve power density and reduce cost. The specific solution is as follows:
[0043] like Figure 2 As shown, the power converter 20 includes: a conversion circuit 201 and at least one multi-pole switch ( Figure 2 (The example shown uses two multi-pole switches, QS1 and QS2).
[0044] The second side of the conversion circuit 201 is connected to the second side of the power converter 20; the specific topology of the conversion circuit 201 is not limited, for example, it can be... Figure 2The DC / AC conversion circuit shown here has its DC side as the first side and its AC side as the second side. The AC side can be connected to the second side of the power converter 20 through a corresponding AC switch. The second side of the power converter 20 can be used to connect to the power grid and / or a load.
[0045] The first side of the conversion circuit 201 is connected to the second side of the multi-pole switch, and the first side of the multi-pole switch is connected to at least two interfaces on the first side of the power converter 20; each interface on the first side of the power converter 20 is used to connect to a corresponding branch. For example... Figure 2 As shown, the first side of the conversion circuit 201 is connected to the second side of each multi-pole switch QS1 and QS2; the first side of the first multi-pole switch QS1 is connected to two interfaces on the first side of the power converter 20, and the first side of the second multi-pole switch QS2 is connected to the other two interfaces on the first side of the power converter 20; the branches connected to each interface on the first side of the power converter 20 can be the corresponding branch power conversion devices (…). Figure 2 (Taking DC / DC converter 10 as an example) the second-side power transmission branch; the first side of each branch power conversion device can be used to connect to the corresponding first power supply unit, for example, the branch power conversion device is... Figure 2 When the DC / DC converter 10 is used, its first side can be used to connect DC power supply units such as photovoltaic strings or battery clusters. In practical applications, the branch power conversion device can also be an AC / DC converter, a DC / AC converter, or an AC / AC converter, with its first side used to connect to a first power supply unit and its second side connected to the corresponding interface on the first side of the power converter 20. When its first side is an AC side, the first power supply unit can be an AC power supply unit such as a wind turbine. It depends on the specific application environment, and all of them are within the protection scope of this disclosure.
[0046] A multi-pole switch includes at least three conductive loops to allow access to at least two branches; Figure 2 The example shown uses the multi-pole switches QS1 and QS2, which each contain four conductive loops S1 to S4. Figure 2Taking the first multi-pole switch QS1 as an example, two conductive loops S1 and S2 are used to connect one branch, and the other two conductive loops S3 and S4 are used to connect the other branch. Specifically, the first conductive loop S1 connects the second positive terminal of the first DC / DC converter 10 to the first positive terminal of the conversion circuit 201; the second conductive loop S2 connects the second negative terminal of the first DC / DC converter 10 to the first negative terminal of the conversion circuit 201; the third conductive loop S3 connects the second positive terminal of the second DC / DC converter 10 to the first positive terminal of the conversion circuit 201; and the fourth conductive loop S4 connects the second negative terminal of the second DC / DC converter 10 to the first negative terminal of the conversion circuit 201. That is, Figure 2 The two 2-pole switches are designed into a 4-pole switch to reduce the size of the switch. This allows for the connection of more branches without changing the size of the power converter 20, thereby increasing power density and reducing design costs.
[0047] In practical applications, the multi-pole switch can also be a 6-pole switch or an 8-pole switch, as long as the number of its internal electrode circuits is greater than the number when a single branch is connected, ensuring that at least two branches can be connected. This can be determined based on the specific application environment and is within the scope of this disclosure. Furthermore, the conversion circuit 201 can also adopt other topologies, such as a DC / DC conversion circuit, an AC / DC conversion circuit, or an AC / AC conversion circuit. When its first side is the AC side, if the connected branch is a single-phase AC transmission branch, the number of internal conductive circuits of the multi-pole switch can be 4, 6, 8, etc.; if the connected branch is a three-phase AC transmission branch, the number of internal conductive circuits of the multi-pole switch can be 6, 9, 12, etc. Regarding the setting of the number of internal electrode circuits of the multi-pole switch, only some optional examples are provided here; other optional examples can be found below.
[0048] The power converter 20 provided in this embodiment has at least one multi-pole switch connected to the first side of its conversion circuit 201. The multi-pole switch includes at least three conductive loops to enable the connection of at least two branches. That is, the multi-pole switch in this power converter 20 increases the number of connected branches. With the limited size of the power converter 20, more branches can be connected, thereby increasing the power density of the power converter 20 and reducing the design cost.
[0049] Based on the previous embodiment, this embodiment provides another power converter in which at least two conductive circuits are stacked in all the conductive circuits of the multi-pole switch. For example, all the conductive circuits in the multi-pole switch may be stacked.
[0050] Figure 3 exist Figure 2Based on the given scenario, an exemplary structure of a 4-pole multi-pole switch is provided, specifically comprising four conductive circuits S1 to S4. Conductive circuits S1 and S3 are both positive circuits located on the same layer, while conductive circuits S2 and S4 are both negative circuits located on another layer. This allows the 4-pole switch to achieve a stacked design. That is, Figure 3 By stacking the conductive circuits inside two 2-pole DC switches into a 4-pole DC switch, the size of the DC switch can be reduced, allowing more branches to be connected without changing the size of the power converter.
[0051] In practical applications, when the multi-pole switch is a DC switch, the number of its internal conductive loops can also be other values, as long as at least two branches can be connected. Moreover, in this DC switch, it can be configured such that the conductive loops connected to the positive poles of different branches (such as the positive loops S1 and S3 mentioned above) are distributed on the same layer, and the conductive loops connected to the negative poles of different branches (such as the negative loops S2 and S4 mentioned above) are distributed on the same layer. This allows for a reduction in the size of the multi-pole switch through a stacked design in the switch space, enabling more branches to be connected within the limited cabinet size of the power converter, thereby increasing the power density of the power converter and reducing design costs. Furthermore, having different pole conductive loops set on different layers is beneficial for the internal safety design of the multi-pole switch and can also be coordinated with the overall structural layout.
[0052] In another example, it can also be set up such that conductive loops connected to the same branch are distributed on the same layer, for example, for Figure 2 The 4-pole switch shown can have conductive loops S1 and S2 on one layer, while conductive loops S3 and S4 are on another. In practical applications, the spatial arrangement of the four conductive loops inside a 4-pole switch can be achieved in other ways, not limited to this. For multi-pole switches with more poles, as long as at least two conductive loops are stacked, the size can be reduced to some extent, allowing a smaller switch to connect to more branches; these will not be elaborated further here.
[0053] Based on the above embodiment, this embodiment illustrates the connection method of the multi-pole switch in the power converter, for example:
[0054] In one example, each interface on the first side of each multi-pole switch is connected to its corresponding branch, and each interface on the second side of each multi-pole switch is connected to the first side of the conversion circuit 201; specifically, each interface on the second side of each multi-pole switch can be connected via... Figure 4 (in) Figure 2(Based on the structure shown, this is an example) The DC bus (including the positive BUS+ and negative BUS-, which can be implemented using copper busbars) shown is connected in parallel to the first side of the conversion circuit 201, but in actual applications it is not limited to this.
[0055] In another example, in a multi-pole switch, it can be configured such that at least two conductive loops are connected in parallel outside the second side of the multi-pole switch. For example... Figure 5 (in) Figure 2 (Based on the structure shown, for example, two positive circuits S1 and S3 are connected in parallel outside the second side of the multi-pole switch, and two negative circuits S2 and S4 are connected in parallel outside the second side of the multi-pole switch. The parallel connection points on the second side of each multi-pole switch are then connected to the first side of the conversion circuit 201, for example, through a DC bus (including positive BUS+ and negative BUS-) connected in parallel to the first side of the conversion circuit 201.) Figure 4 As shown, each of the interfaces on the second side of each multi-pole switch is directly connected to the DC bus, unlike the others. Figure 5 Each of the interfaces on the second side of the multi-pole switch is connected in parallel and then connected to the DC bus. Both methods can achieve the parallel connection of the interfaces on the second side of each multi-pole switch to the first side of the converter circuit 201, depending on the specific application environment, and are all within the protection scope of this disclosure.
[0056] In another example, in a multi-pole switch, it can also be configured such that at least two conductive loops are connected in parallel inside the second side of the multi-pole switch. For example... Figure 6 (in) Figure 2 (Based on the structure shown, as an example), the two positive circuits S01 and S02 are connected in parallel inside the second side of the multi-pole switch, and the two negative circuits S03 and S04 are connected in parallel inside the second side of the multi-pole switch; the second-side interfaces of each multi-pole switch can then be connected to the first side of the conversion circuit 201. In practical applications, they can also be connected in parallel to the first side of the conversion circuit 201 via a DC bus. For Figure 6 For a 4-pole switch, there are two interfaces on the first side and one interface on the second side. If power is transferred from the first side to the second side, then the first side is the input side and the second side is the output side. The terminal settings of the interfaces on both sides can be adopted... Figure 7 The method shown, with only 2 terminals on the output side and 4 terminals on the input side using a stacked design, can reduce size and save on the cost of copper busbar layout for DC buses.
[0057] In another example, it can be configured such that at least two branches connected to the multi-pole switch share the same conductive path. For example... Figure 8As shown, each of the multi-pole switches QS1 and QS2 is a 3-pole switch, containing 3 conductive circuits. S1 is the positive circuit, used to achieve shared on / off control after the positive poles of two branches are connected in parallel. S2 and S3 are negative circuits, used to connect to the negative poles of their respective branches. Figure 8 Based on the structure shown, two negative circuits S2 and S3 can be set to be connected in parallel inside or outside the second side of the 3-pole switch. When connected in parallel inside the second side, the number of terminals on the second side can be reduced, thereby reducing the cost of multi-pole switches and DC buses.
[0058] In practical applications, multi-pole switches can also be connected in other ways, and the above examples are not intended to limit their connection methods. In addition, when the number of multi-pole switches in the power converter is greater than 1, the structural settings and connection methods of each multi-pole switch can be the same or different, depending on the specific application environment, and all are within the protection scope of this disclosure.
[0059] Based on the above embodiments, such as Figure 9 (in) Figure 2 As shown in the example (based on the structure shown), the power converter 20 may also include: multiple overcurrent protection devices (such as...) Figure 9 The fuse shown is connected to the first side of the conversion circuit 201 via a corresponding overcurrent protection device. The second-side interfaces of the multi-pole switch are connected to the first side of the multi-pole switch via corresponding overcurrent protection devices. Figure 9 As shown, for the case where the first side of the conversion circuit 201 is the DC side, each interface on the second side of the multi-pole switch can include two terminals, namely a positive terminal and a negative terminal; in this case, each terminal can be connected to a corresponding overcurrent protection device (such as...). Figure 9 As shown in the figure, it is also possible to set only one of the terminal sub-connected to an overcurrent protection device (not shown), depending on the specific application environment, and all of them are within the protection scope of this disclosure.
[0060] In practical applications, this overcurrent protection device is not limited to traditional fuses; intelligent fuses such as excitation fuses can also be used, depending on the specific application environment, and all are within the protection scope of this disclosure.
[0061] In power conversion systems, such as in Figure 1 In the traditional inverter system shown, the fuses in the DC / AC converter 02 are all located before each DC switch QS. However, the DC / DC converter 01 is often hundreds of meters away from the DC / AC converter 02, and the DC / DC converters 01 may not be placed in a concentrated manner. Therefore, when maintaining the fuses in the DC / AC converter 02, it is required to disconnect the switch on the output side of the preceding DC / DC converter 01 (not shown in the figure), which brings inconvenience to maintenance personnel and wastes manpower costs.
[0062] In this embodiment, by placing the overcurrent protection device between the multi-pole switch and the conversion circuit 201, when maintaining the overcurrent protection device, simply disconnecting the multi-pole switch can cut off its electrical connection with the upstream stage. There is no need for maintenance personnel to disconnect the upstream branch power conversion equipment, which can also realize local maintenance, making maintenance faster and more convenient, saving maintenance personnel's working time and reducing labor costs.
[0063] Based on the above embodiments, such as Figure 10 (in) Figure 9 As shown in the example (based on the structure shown), the power converter 20 may further include a coupling side, where each interface of the coupling side is connected to the second interface of the multi-pole switch and the corresponding overcurrent protection device (such as...). Figure 10 Between the fuses shown, each interface on the coupling side is used to connect to a corresponding coupling power transmission device; this coupling power transmission device can refer to... Figure 10 The bidirectional DC / DC converter 301 shown has a second side for connecting to the corresponding interface of the coupling side, and a first side for connecting to the battery unit 302. The battery unit 302 can specifically refer to one or at least two battery clusters connected in parallel, and the battery clusters may include one or more batteries connected in series. Each bidirectional DC / DC converter 301 and each battery unit 302 can be integrated into an energy storage system 30.
[0064] Figure 10 Taking the power converter 20 as an example of a DC / AC converter, its first side interface is a DC side interface, which is connected to the corresponding photovoltaic unit through the corresponding DC / DC converter 10. The photovoltaic unit may include one or more photovoltaic strings connected in parallel, and the photovoltaic string includes one or more photovoltaic modules PV (PV) connected in series. Figure 10 (Taking a photovoltaic unit including a photovoltaic string as an example for demonstration); the second side interface of the power converter 20 is the AC side interface of the DC / AC converter, which can be connected to the power grid and / or load; the power converter 20 can also have a coupling side interface, which can be the energy storage interface of the DC / AC converter, arranged between the output side of the DC switch and the overcurrent protection device, so that the photovoltaic and energy storage can share the overcurrent protection device, avoiding the need to add a dedicated overcurrent protection device to the energy storage interface, which can save device costs, and avoid the increase in structural size caused by setting a dedicated overcurrent protection device for the energy storage interface, as well as the additional costs caused by the increased heat loss of the dedicated overcurrent protection device, which has advantages in structural layout and cost.
[0065] In this embodiment, when the energy storage system 30 is connected in the DC-coupled topology, the overcurrent protection device can be shared to realize the short-circuit protection of the external cable; that is, for the dual-port power converter 20 with the first side interface and the coupling side interface, it is possible to avoid the need to add an extra overcurrent protection device when it is connected to the coupling power transmission device, thereby reducing the system design cost.
[0066] Another embodiment of this disclosure provides a power conversion system, including: at least one power converter, and at least two branch power conversion devices (such as the DC / DC converters 10 described in the above embodiments); a first side of the branch power conversion device is used to connect to a first power supply unit, and a second side of the branch power conversion device is connected to the corresponding interface of the first side of the power converter 20. The structure and working principle of the power converter can be found in the above embodiments, and will not be repeated here.
[0067] As described in the above embodiments, the conversion circuit in the power converter can be a DC / AC conversion circuit, a DC / DC conversion circuit, an AC / DC conversion circuit, or an AC / AC conversion circuit. When the conversion circuit is a DC / AC conversion circuit, its DC side is the first side of the conversion circuit, and its AC side is the second side of the conversion circuit. When the conversion circuit is a DC / DC conversion circuit, its two sides are respectively the first side and the second side of the conversion circuit, for example, its low-voltage side can be the first side of the conversion circuit, and its high-voltage side can be the second side of the conversion circuit. When the conversion circuit is an AC / DC conversion circuit, its DC side can be the first side of the conversion circuit, and its AC side can be the second side of the conversion circuit, or its AC side can be the first side of the conversion circuit, and its DC side can be the second side of the conversion circuit. When the conversion circuit is an AC / AC conversion circuit, its two sides are respectively the first side and the second side of the conversion circuit. The first side of the power converter can be connected to multiple branches. When the number of power converters is greater than one, the second sides of each power converter can be connected in parallel. For example, when the second side is an AC side, they can be connected in parallel and then connected to the power grid through a transformer. This is not limited here.
[0068] The branch power conversion device can be the DC / DC converter 10 described in the above embodiment, and the first power supply unit is the photovoltaic unit described in the above embodiment. The structure of the power conversion system can then be found in [reference needed]. Figure 2 , Figures 4 to 6 , Figures 8 to 9Any of the following will not be elaborated upon here. Alternatively, the branch power conversion device can also be an AC / DC converter, a DC / AC converter, or an AC / AC converter, with its first side used to connect to the first power supply unit and its second side connected to the corresponding interface on the first side of the power converter 20. Specifically, when the branch power conversion device is a DC / DC converter, its two sides are the first and second sides of the branch power conversion device, respectively; when the branch power conversion device is an AC / DC converter, its AC side is the first side of the branch power conversion device, and its DC side is the second side of the branch power conversion device; when the branch power conversion device is a DC / AC converter, its DC side is the first side of the branch power conversion device, and its AC side is the second side of the branch power conversion device; when the branch power conversion device is an AC / AC converter, its two sides are the first and second sides of the branch power conversion device, respectively. Furthermore, when the first side of the branch power conversion device is a DC side, the first power supply unit can be a DC power supply unit such as a photovoltaic unit; when the first side of the branch power conversion device is an AC side, the first power supply unit can be an AC power supply unit such as a wind turbine.
[0069] The power conversion system provided in this embodiment uses a multi-pole switch in its internal power converter, which allows for the connection of more branches with limited power converter size, thereby increasing the power density of the power converter and reducing design costs.
[0070] In addition, the power conversion system may also include: at least two coupled power transmission devices (such as the bidirectional DC / DC converters 301 described in the above embodiments); the first side of the coupled power transmission device is used to connect to the second power supply unit, and the second side of the coupled power transmission device is connected to the corresponding interface of the coupled side of the power converter 20.
[0071] Specifically, the coupled power transmission device can be the bidirectional DC / DC converter 301 described in the above embodiment, and the second power supply unit can be the battery unit described in the above embodiment. In this case, the structure of the power conversion system can be referred to... Figure 10 This will not be elaborated upon here.
[0072] The power conversion system provided in this embodiment can not only improve the power density of the power converter and reduce the design cost, but also simplify the structural layout and reduce the system design cost by sharing overcurrent protection devices between the branch power conversion equipment and the coupled power transmission equipment.
[0073] Similar or identical parts between the various embodiments in this disclosure can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.
[0074] Those skilled in the art will also recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.
[0075] The above description of the disclosed embodiments shows that the features described in the various embodiments of this disclosure can be substituted for or combined with each other, enabling those skilled in the art to implement or use this disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A power converter, characterized in that, include: A conversion circuit and at least one multi-pole switch; wherein, The second side of the conversion circuit is connected to the second side of the power converter; The first side of the conversion circuit is connected to the second side of the multi-pole switch, and the first side of the multi-pole switch is connected to at least two interfaces on the first side of the power converter; each interface on the first side of the power converter is used to connect to a corresponding branch power conversion device through a corresponding branch, and the other side of the branch power conversion device is used to connect to the first power supply unit. The multi-pole switch includes at least three conductive loops to enable the connection of at least two of the branches.
2. The power converter according to claim 1, characterized in that, In the multi-pole switch, at least two conductive circuits are stacked in all of its conductive circuits.
3. The power converter according to claim 1, characterized in that, The multi-pole switch is a DC switch; in the DC switch, each conductive circuit connected to the positive terminal of different branches is distributed on the same layer, and each conductive circuit connected to the negative terminal of different branches is distributed on the same layer.
4. The power converter according to claim 1, characterized in that, Each conductive loop connected to the same branch is distributed in the same layer.
5. The power converter according to any one of claims 1 to 4, characterized in that, In the multi-pole switch, at least two conductive loops are connected in parallel inside or outside the second side of the multi-pole switch.
6. The power converter according to any one of claims 1 to 4, characterized in that, Among the branches connected to the multi-pole switch, at least two branches share the same conductive circuit.
7. The power converter according to any one of claims 1 to 4, characterized in that, The power converter also includes: multiple overcurrent protection devices; Each of the second-side interfaces of the multi-pole switch is connected to the first side of the conversion circuit through the corresponding overcurrent protection device.
8. The power converter according to claim 7, characterized in that, The power converter also includes a coupling side, wherein each interface of the coupling side is connected between each interface of the second side of the multi-pole switch and the corresponding overcurrent protection device, and each interface of the coupling side is used to connect to the corresponding coupling power transmission device.
9. A power conversion system, characterized in that, include: At least one power converter as described in any one of claims 1 to 8, and at least two branch power conversion devices; The first side of the branch power conversion device is used to connect to the first power supply unit; The second side of the branch power conversion device is connected to the corresponding branch interface of the first side of the power converter.
10. The power conversion system according to claim 9, characterized in that, The power conversion system further includes: at least two coupled power transmission devices; The first side of the coupled power transmission device is used to connect to the second power supply unit; The second side of the coupled power transmission device is connected to the corresponding interface of the coupling side of the power converter.
11. The power conversion system according to claim 9 or 10, characterized in that, The conversion circuit in the power converter is a DC / AC conversion circuit; The DC side of the DC / AC conversion circuit is the first side of the conversion circuit, and the AC side of the DC / AC conversion circuit is the second side of the conversion circuit.
12. The power conversion system according to claim 9, characterized in that, The branch power conversion device is a DC / DC converter, and the first power supply unit is a photovoltaic unit.
13. The power conversion system according to claim 10, characterized in that, The coupled power transmission device is a bidirectional DC / DC converter, and the second power supply unit is a battery unit.