Power converter and power supply system
By optimizing the structural layout and cooling method of photovoltaic inverters, the challenges of high-density design and high efficiency of existing photovoltaic inverters have been solved, resulting in a power converter with smaller size, lower heat generation, and higher power.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- HUAWEI TECH CO LTD
- Filing Date
- 2025-12-31
- Publication Date
- 2026-07-30
AI Technical Summary
The current internal structure of photovoltaic inverters is not designed properly, which limits the improvement of product performance, especially in terms of high-density design, high efficiency and high power.
The power converter adopts a stacked layout of capacitor modules, power modules, and power inductors, combined with the gas-liquid phase change cooling method of evaporator and condenser. The power inductors and power modules are directly connected by wires, and the power converter is electrically connected by a stacked busbar, thus optimizing the structural layout of the power converter.
It increases the layout density, reduces the size and heat generation of the power converter, supports higher power, reduces current loss, and improves heat dissipation performance and circuit efficiency.
Smart Images
Figure CN2025148362_30072026_PF_FP_ABST
Abstract
Description
Power converters and power supply systems
[0001] This application claims priority to Chinese Patent Application No. 202510121183.0, filed on January 24, 2025, entitled "Power Converter and Power Supply System", the entire contents of which are incorporated herein by reference. Technical Field
[0002] This application relates to the field of power electronics technology, and in particular to a power converter and a power supply system. Background Technology
[0003] Driven by the national "dual-carbon" goals, the market demand for clean energy such as photovoltaics is increasing daily across the energy industry. Improving effective power generation and reducing the cost per watt are the core requirements for photovoltaic inverter products. Photovoltaic inverters are developing towards higher power, higher efficiency, and higher density, facing numerous challenges in product development, such as high-density design, efficient heat dissipation, and high-voltage, high-current handling. However, the unreasonable internal structural layout of conventional photovoltaic inverters limits the improvement of product performance. Summary of the Invention
[0004] This application provides a power converter and a power supply system, which can optimize the structural layout of the power converter and improve the product performance of the power converter and the power supply system.
[0005] In a first aspect, embodiments of this application provide a power converter, including a capacitor module, a power module, and a power inductor, wherein the capacitor module, power module, and power inductor are arranged sequentially along a first direction; the power module includes a DC-DC power module and a DC-AC power module, which are arranged along a second direction intersecting the first direction; the projection of the capacitor module in the first direction overlaps with both the DC-DC power module and the DC-AC power module; the capacitor module is electrically connected to both the DC-DC power module and the DC-AC power module; the power inductor includes a DC-DC power inductor and a DC-AC power inductor, which are arranged along the second direction, and the DC-DC power inductor is electrically connected to both the DC-DC power module and the DC-AC power inductor.
[0006] In this embodiment, by adopting the stacked layout of the components in the power converter as described above, the layout density can be increased and layout space saved compared to laying the components flat, which is beneficial to reducing the size of the power converter. It also helps to shorten the current path, thereby reducing the heat generation of the power converter, enabling the power converter to support higher power and reducing current loss. For example, since there can be no other devices obstructing the DC-DC power module and the DC-AC power module, the DC-DC power module and the DC-AC power module can be arranged close together, which can shorten the current path between the DC-DC power module and the DC-AC power module, thereby significantly reducing the heat generation of the power converter, enabling the power converter to support higher power and reducing current loss.
[0007] In one implementation of the first aspect, the power converter further includes an evaporator and a condenser connected together; a power module is disposed on the evaporator, and the capacitor module, power module, evaporator and power inductor are arranged sequentially along a first direction, while the condenser and power inductor are arranged along a second direction.
[0008] In this implementation, by setting up an evaporator and a condenser, the power converter can be cooled through a gas-liquid phase change cooling method, effectively reducing the heat generation of the power converter and enabling it to support higher power. By placing the power module directly on the evaporator, for example, adjacent to it, the power module, which generates significant heat, can be effectively cooled, improving its heat dissipation performance.
[0009] In one implementation of the first aspect, the power converter further includes a first wire and a second wire, the first wire connecting a DC-DC power inductor and a DC-DC power module, and the second wire connecting a DC-AC power inductor and a DC-AC power module.
[0010] In this implementation, the power inductor and the power module are connected by wires, which can achieve a direct connection between the two. This avoids the drawback of using a circuit board to connect the two in conventional solutions, which is conducive to achieving high current flow, shortening the current path, reducing heat generation, reducing parasitic inductance, and improving the heat conduction and heat dissipation of the evaporator.
[0011] In one implementation of the first aspect, the evaporator is provided with a channel that extends through the evaporator in a first direction, and a first wire or a second wire passes through the channel; or, the evaporator is provided with two channels, both of which extend through the evaporator in a first direction, and the first wire and the second wire pass through one channel respectively.
[0012] In this implementation, by setting a channel on the evaporator and allowing the wires to pass through the channel to connect the power inductor and the power module, it is easier to design a larger evaporator size, giving the evaporator a larger area, which facilitates the improvement of the evaporator's heat conduction and heat dissipation effect on the power module.
[0013] In one implementation of the first aspect, the power converter further includes a housing, in which the capacitor module, power module, and evaporator are all housed, while at least a portion of the power inductor and at least a portion of the condenser are located outside the housing. This structural design can meet product requirements.
[0014] In one implementation of the first aspect, the housing has two through holes; the power converter also includes a first wire and a second wire. The first wire passes through one through hole and connects the DC-DC power inductor and the DC-DC power module, and the second wire passes through the other through hole and connects the DC-AC power inductor and the DC-AC power module. This design, allowing the wires to pass through the housing, meets product requirements. By connecting the power inductor and the power module with wires passing through the housing, a direct connection between the power inductor and the power module can be achieved, avoiding the drawbacks of conventional solutions that use circuit boards to connect them. This facilitates higher current flow, shortens the current path, reduces heat generation, reduces parasitic inductance, and improves the heat conduction and dissipation of the evaporator.
[0015] In one implementation of the first aspect, the capacitor module includes a first filter capacitor and a current-carrying board. The first filter capacitor is disposed on the current-carrying board, and the first filter capacitor, the current-carrying board, the power module, and the power inductor are arranged sequentially along a first direction. The current-carrying board is electrically connected to the first filter capacitor, the DC-DC power module, and the DC-AC power module. The current-carrying board includes a conductor layer with a thickness greater than or equal to 1 mm. In this implementation, the conductor layer in the current-carrying board has a relatively large thickness, giving the current-carrying board a large current-carrying capacity. This allows for reliable electrical connection between the filter capacitor, the power module, and the power inductor, avoiding the current-carrying capacity limitation caused by using PCB current-carrying in conventional solutions.
[0016] In one implementation of the first aspect, the current-carrying board is a laminated busbar, which includes multiple conductor layers stacked sequentially along a first direction. Using a laminated busbar can better meet the product's requirements for high current-carrying capacity and mass production.
[0017] In one implementation of the first aspect, the plurality of conductor layers in the stacked busbar include a first conductor layer, a second conductor layer and a third conductor layer, a first voltage is present between the first conductor layer and the third conductor layer, a second voltage is present between the second conductor layer and the first conductor layer, and a second voltage is present between the second conductor layer and the third conductor layer, the second voltage being half of the first voltage; the power converter includes a plurality of first filter capacitors electrically connected to the first conductor layer and the second conductor layer, and a plurality of first filter capacitors electrically connected to the second conductor layer and the third conductor layer.
[0018] In this implementation, by setting three conductor layers (first conductor layer, second conductor layer, and third conductor layer) on the current-carrying plate, the voltage can be divided and stepped down, thereby matching the working voltage of the filter capacitor arranged on the current-carrying plate, so that the filter capacitor can work normally.
[0019] In one implementation of the first aspect, the stacked busbar includes two second conductor layers, wherein one second conductor layer, a first conductor layer, a third conductor layer, and another second conductor layer are stacked sequentially along a first direction; all the first filter capacitors in the power converter are arranged on one of the second conductor layers.
[0020] In this implementation, by having a first conductor layer, two second conductor layers, and a third conductor layer on the stacked busbar, it is convenient to arrange the conductor layer for the connection busbar median voltage VN on the outermost layer of the stacked busbar, and to arrange the filter capacitor on the conductor layer for the connection busbar median voltage VN. This helps to reduce the creepage distance of the filter capacitor and meet safety requirements.
[0021] In one implementation of the first aspect, the current-carrying plate is a stacked busbar, which includes a plurality of conductor layers stacked sequentially along a first direction; the plurality of conductor layers in the stacked busbar include a first conductor layer, a second conductor layer, and a third conductor layer, with a first voltage between the first conductor layer and the third conductor layer, a second voltage between the second conductor layer and the first conductor layer, and a second voltage between the second conductor layer and the third conductor layer, the second voltage being half of the first voltage; the plurality of conductor layers in the stacked busbar also include a fourth conductor layer, a fifth conductor layer, and a sixth conductor layer, the fourth conductor layer being used to connect to phase A, the fifth conductor layer being used to connect to phase B, and the sixth conductor layer being used to connect to phase C; the power converter also includes a plurality of second filter capacitors disposed on the current-carrying plate, wherein at least one second filter capacitor is electrically connected to the fourth conductor layer and the second conductor layer, at least one second filter capacitor is electrically connected to the fifth conductor layer and the second conductor layer, and at least one second filter capacitor is electrically connected to the sixth conductor layer and the second conductor layer.
[0022] In this implementation, by also incorporating the second filter capacitor (e.g., a DC-AC filter capacitor) onto the laminated busbar, the N line (connected to the busbar's median voltage VN) can be shared, which helps improve the filtering quality. Correspondingly, the laminated busbar can be equipped with a fourth, fifth, and sixth conductor layer to connect the three phases (A, B, and C), thereby achieving the corresponding electrical functions.
[0023] Secondly, embodiments of this application provide a power supply system including the power converter described above, wherein the power converter is used to connect a DC power source and a power grid. In this application embodiment, by employing this power converter, the layout density can be increased, layout space saved, and the size of the power converter reduced; it also helps to shorten the current path, thereby reducing the heat generated by the power converter, enabling the power converter to support higher power and reducing current losses. Therefore, the solution of this application embodiment can improve product performance.
[0024] In one implementation of the second aspect, the power supply system includes multiple power converters, the AC sides of which are connected in parallel to the power grid. This implementation can meet specific application scenarios, such as string photovoltaic systems. Attached Figure Description
[0025] Figure 1 is a schematic diagram of an application scenario of a photovoltaic system according to an embodiment of this application;
[0026] Figure 2 is a schematic diagram of another application scenario of a photovoltaic system according to an embodiment of this application;
[0027] Figure 3 is a three-dimensional structural schematic diagram of a power converter according to an embodiment of this application;
[0028] Figure 4 shows a partial AA cross-sectional view of the power converter in Figure 3;
[0029] Figure 5 is a schematic diagram of the capacitor module of the power converter in Figure 4 along direction B.
[0030] Figure 6 is a cross-sectional view of the stacked busbar in one embodiment of this application;
[0031] Figure 7 is a cross-sectional view of the stacked busbar in another embodiment of this application;
[0032] Figure 8 shows a top view of the power converter in one embodiment of this application.
[0033] Figure 9 illustrates a partial AA cross-sectional view of a power converter in another embodiment of this application;
[0034] Figure 10 is a schematic diagram of the capacitor module of the power converter in Figure 9 along direction B.
[0035] Figure 11 is a schematic diagram of the CC cross-sectional structure of the current-carrying plate of the capacitor module shown in Figure 10;
[0036] Figure 12 illustrates a CC cross-sectional view of the stacked busbar in another embodiment of this application;
[0037] Figure 13 illustrates the circuit diagram of a power converter in one embodiment of this application. Detailed Implementation
[0038] This application provides a power converter and a power supply system including the power converter, which can be applied to different application scenarios, such as photovoltaic power supply scenarios and energy storage power supply scenarios.
[0039] Figure 1 illustrates an application scenario of a photovoltaic system. Referring to Figure 1, the photovoltaic system may include a photovoltaic array 110, a power converter 120, a power grid 130, and a load 140, etc.
[0040] As shown in Figure 1, for example, a photovoltaic array 110 can be formed by connecting one or more photovoltaic modules 1101. The photovoltaic array 110 may include, for example, multiple photovoltaic strings connected in parallel, each photovoltaic string including multiple photovoltaic modules 1101 connected in series. In one embodiment, the photovoltaic system may also generate photovoltaic power using a single photovoltaic module 1101 or a single photovoltaic string, without forming a photovoltaic array 110. The following description uses a photovoltaic system using a photovoltaic array 110 for photovoltaic power generation as an example.
[0041] As shown in Figure 1, the power converter 120 may include a DC-DC converter circuit 1201 and a DC-AC converter circuit 1202. The DC power generated by the photovoltaic array 110 is converted into AC power after passing through the DC-DC converter circuit 1201 and the DC-AC converter circuit 1202 and transmitted to the power grid 130 or the load 140. The power converter 120 shown in Figure 1 may be an inverter.
[0042] As shown in Figure 1, in some photovoltaic-storage integration scenarios, the photovoltaic system may also include an energy storage device 150, which can be connected to a DC-DC converter circuit 1201. The DC power generated by the photovoltaic array 110 is boosted or bucked by the DC-DC converter circuit 1201 to charge the energy storage device 150. When the electrical energy generated by the photovoltaic array 110 is insufficient to supply power to the grid 130 / load 140, the electrical energy stored in the energy storage device 150 can be transmitted to the grid 130 / load 140 through the DC-DC converter circuit 1201 and the DC-AC converter circuit 1202.
[0043] In this embodiment, both the photovoltaic array 110 and the energy storage device 150 can be referred to as DC power supplies.
[0044] In one embodiment of this application, the power converter 120 may be a power conversion system (PCS), or a bidirectional converter. The power converter 120 is connected to the power grid, the energy storage device, and the AC load. The PCS may include a DC-AC conversion circuit, an AC-DC conversion circuit (rectifier circuit), and a DC-AC conversion circuit. The PCS can convert direct current (DC) to alternating current (AC) and vice versa. The PCS can obtain AC power from the power grid, convert it to DC power through the rectifier circuit, and charge the energy storage device. Alternatively, the PCS can convert the DC power from the energy storage device to AC power through the DC-AC conversion circuit and supply the AC power to the AC load or the power grid.
[0045] Figure 2 illustrates an application scenario of a photovoltaic system, which can be a string photovoltaic system. As shown in Figure 2, the photovoltaic system can include a photovoltaic array 110 and multiple power converters 120. The DC side of one power converter 120 can be connected to one or more photovoltaic arrays 110, and the AC sides of all power converters 120 can be connected to an AC distribution cabinet 160. All power converters 120 can be connected in parallel within the AC distribution cabinet 160. The AC distribution cabinet 160 is used to receive the AC power input from the power converters 120 and perform power distribution (including combining). The AC distribution cabinet 160 can directly transmit power to the low-voltage grid 131, or it can be stepped up by a transformer 170 and transmitted to the medium-voltage grid 132. For example, the photovoltaic system can also include a data acquisition unit 180 to collect the operating conditions of each power converter 120 and output the collected signals to a monitoring terminal 190 for personnel monitoring. The power converter 120 in Figure 2 can be a string inverter. It can be assumed that the AC side of all power converters 120 can be connected in parallel to the power grid.
[0046] It is understood that the above are merely illustrative examples of application scenarios for the embodiments of this application, and not exhaustive. The embodiments of this application do not limit the application scenarios. Furthermore, the above description uses inverters and string inverters as examples of power converters, but the power converters in the embodiments of this application are not limited to these. The structure of the power converters in the embodiments of this application will be described in detail below.
[0047] Figure 3 illustrates a three-dimensional structure of a power converter 1 according to one embodiment. As shown in Figure 3, the power converter 1 may include a housing 10, a power inductor 15, and a condenser 16, etc. The power inductor 15 may include a DC-DC power inductor 151 and a DC-AC power inductor 152. At least a portion of the DC-DC power inductor 151 and at least a portion of the DC-AC power inductor 152 may be exposed outside the housing 10. A portion of the condenser 16 may be exposed outside the housing 10, while another portion of the condenser 16 may be located inside the housing 10. A working fluid flows within the condenser 16 for liquid cooling.
[0048] As shown in Figure 3, by way of example, the DC-DC power inductor 151, the condenser 16, and the DC-AC power inductor 152 can all be located on the side wall 10a of the housing 10, and the DC-DC power inductor 151, the condenser 16, and the DC-AC power inductor 152 can be arranged sequentially along the Z-direction (the Z-direction can be the height direction of the power converter 1 when it is in the operating position). In another embodiment, the positions of the above-mentioned devices can be arbitrarily arranged as needed, and are not limited to those shown in Figure 3.
[0049] Figure 4 shows a partial cross-sectional view of the power converter 1 in Figure 3, where only the side wall 10a of the housing 10 and the evaporator 14 inside the housing 10 are shown in cross-section, and other components are not shown in cross-section.
[0050] As shown in Figure 4, in one embodiment, the power converter 1 may include a capacitor module 11, a power module 12, wires 13, an evaporator 14, a power inductor 15, and a condenser 16. The capacitor module 11, power module 12, wires 13, and evaporator 14 may all be located inside the sidewall 10a of the housing 10, or within the housing 10. At least a portion of the power inductor 15 may be located outside the sidewall 10a, or at least a portion of the power inductor 15 may be exposed outside the housing 10. The condenser 16 may pass through the sidewall 10a, and a portion of the condenser 16 may be located outside the sidewall 10a.
[0051] In this embodiment, the condenser 16 and the evaporator 14 can form a heat exchange system, achieving heat conduction through the flow and phase change of the working fluid. Exemplarily, the condenser 16 can be attached to and connected to the evaporator 14, for example, by welding them together. This shortens the flow path length in the heat exchange system, which is beneficial for the size of the low-power converter 1. It is understood that the power converter 1 can also include a fan, and the airflow output by the fan is used to cool the condenser 16, ultimately achieving heat dissipation. In another embodiment, the condenser 16 and the evaporator 14 may not be attached to and connected, but rather separated by a certain distance and connected through an intermediate pipe.
[0052] As shown in Figure 4, for example, the capacitor module 11, power module 12, evaporator 14, sidewall 10a, and power inductor 15 can be arranged sequentially along the Y direction, and the power inductor 15 and condenser 16 can be arranged sequentially along the Z direction. As an example, the DC-DC power inductor 151, condenser 16, and DC-AC power inductor 152 can be arranged sequentially along the Z direction. In this embodiment, the Y direction can be referred to as the first direction, and the Z direction as the second direction; obviously, the first direction and the second direction are orthogonal. It is understood that the first direction being the Y direction and the second direction being the Z direction is merely an example based on the coordinate system in Figure 4. In reality, the first direction and the second direction can be any direction determined as needed, as long as they intersect. "Intersection" includes, but is not limited to, orthogonality. In another embodiment, the positions of the capacitor module 11, power module 12, evaporator 14, power inductor 15, and condenser 16 can be arbitrarily arranged as needed, and are not limited to those shown in Figure 4.
[0053] In this embodiment, by adopting the stacked layout of the components in the power converter 1 as described above, the layout density can be increased and layout space can be saved compared to laying the components flat, which is beneficial to reducing the size of the power converter 1. It also helps to shorten the current path, thereby reducing the heat generation of the power converter 1, enabling the power converter 1 to support higher power and reducing current loss.
[0054] The basic architecture of power converter 1 has been outlined above. The following sections will describe each component in power converter 1 in detail.
[0055] Figure 5 is a schematic diagram of the capacitor module 11 in Figure 4 along direction B. As shown in Figures 4 and 5, the capacitor module 11 may include a current-carrying plate 112 and a first filter capacitor 111, which is arranged on the current-carrying plate 112. For example, multiple first filter capacitors 111 can be provided to meet larger capacitance requirements. The first filter capacitor 111, the current-carrying plate 112, the power module 12, and the power inductor 15 can be arranged sequentially along this first direction (e.g., the Y direction).
[0056] As shown in Figure 5, the current-carrying plate 112 can have several through holes 112z. Referring to Figures 4 and 5, a connector 17 (e.g., a screw) can pass through the through holes 112z to fix the current-carrying plate 112 to the power module 12, thereby achieving electrical connection between the current-carrying plate 112 and the power module 12, and consequently, electrical connection between the first filter capacitor 111 and the power module 12. Compared to cable connections, using the current-carrying plate 112 to electrically connect the first filter capacitor 111 to the power module 12 reduces parasitic inductance, improves the circuit efficiency of the power converter 1, enhances circuit stability, optimizes circuit performance, and improves reliability.
[0057] In this embodiment, the current-carrying plate 112 can have a large current-carrying capacity, which can meet the high voltage and high power requirements of the power converter 1. The current-carrying plate 112 has one or more conductor layers, the material of which is, for example, copper. The thickness of the conductor layer can be greater than or equal to 1 mm, for example, 1 mm, 1.5 mm, etc. This thicker conductor layer can carry a larger current, thereby enabling the current-carrying plate 112 to have a large current-carrying capacity. The current-carrying plate 112 can have multiple conductor layers, which can be stacked sequentially along a first direction (e.g., the Y direction). Multiple conductor layers are beneficial for further improving the current-carrying capacity of the current-carrying plate 112.
[0058] In one embodiment, the flow carrier plate 112 can be a laminated busbar, hereinafter referred to as laminated busbar 112.
[0059] Figure 6 illustrates a cross-sectional view of a stacked busbar 112 in one embodiment. As shown in Figure 6, the stacked busbar 112 can be formed by alternating stacking of multiple conductor layers and insulating dielectric layers 112b along a first direction (e.g., the Y direction). An insulating dielectric layer 112b is provided between every two adjacent conductor layers, and a conductor layer is provided between every two insulating dielectric layers 112b. Exemplarily, the stacked busbar 112 may include a first conductor layer 112a, a second conductor layer 112c, and a third conductor layer 112d, which can be stacked sequentially. The first conductor layer 112a and the third conductor layer 112d can be the outermost layers of the stacked busbar 112. Vias can be provided in the stacked busbar 112, through which at least two conductor layers are electrically connected. Each conductor layer in the stacked busbar 112 can be used to transmit current. All first filter capacitors 111 can be arranged on the first conductor layer 112a or the third conductor layer 112d.
[0060] As shown in Figure 6, for example, the first conductor layer 112a can be connected to the positive bus, the second conductor layer 112c can be connected to the neutral line, and the third conductor layer 112d can be connected to the negative bus. V+, VN, and V- can be used to represent that the first conductor layer 112a, the second conductor layer 112c, and the third conductor layer 112d are connected to the positive bus voltage, the bus neutral voltage, and the negative bus voltage, respectively. It is easy to understand that the second conductor layer 112c, which connects to the bus neutral voltage, is adjacent to both the first conductor layer 112a (connected to the positive bus voltage) and the third conductor layer 112d (connected to the negative bus voltage). When the stacked busbar 112 is in operation, there may be a first voltage between the first conductor layer 112a and the third conductor layer 112d, which may be, for example, 1500V; there may be a second voltage between the second conductor layer 112c and the first conductor layer 112a, which may be half of the first voltage, for example, 750V; there may be the second voltage between the second conductor layer 112c and the third conductor layer 112d, for example, 750V.
[0061] The above example uses the first conductor layer 112a, the second conductor layer 112c, and the third conductor layer 112d stacked sequentially. In another embodiment, the order of the first conductor layer 112a, the second conductor layer 112c, and the third conductor layer 112d is not limited, as long as there is a first voltage between the first conductor layer 112a and the third conductor layer 112d, and a second voltage between the second conductor layer 112c and the first conductor layer 112a, and between the second conductor layer 112c and the third conductor layer 112d.
[0062] Referring to Figure 6, the first conductor layer 112a, connected to the positive bus voltage V+, is adjacent to the second conductor layer 112c, connected to the bus midpoint voltage VN. These two layers form an inductively coupled loop, thereby reducing stray inductance between the positive bus and the neutral line in the circuit. Similarly, the third conductor layer 112d, connected to the negative bus voltage V-, is adjacent to the second conductor layer 112c, also connected to the bus midpoint voltage VN. This forms an inductively coupled loop, further reducing stray inductance between the negative bus and the neutral line in the circuit. By reducing stray inductance, voltage fluctuations and overshoot in the power converter 1 can be reduced, electromagnetic interference can be decreased, system reliability can be improved, system performance can be optimized, and the installation and maintenance of the power converter 1 can be facilitated.
[0063] Referring to Figures 5 and 6, the multiple first filter capacitors 111 on the stacked busbar 112 can be electrically connected to the first conductor layer 112a and the second conductor layer 112c, or in other words, one end of these first filter capacitors 111 is connected to the first conductor layer 112a and the other end is connected to the second conductor layer 112c. In Figure 6, the first filter capacitor 111 electrically connected to the first conductor layer 112a and the second conductor layer 112c is represented by C1. The multiple first filter capacitors 111 on the stacked busbar 112 can be electrically connected to the second conductor layer 112c and the third conductor layer 112d, or in other words, one end of these first filter capacitors 111 is connected to the second conductor layer 112c and the other end is connected to the third conductor layer 112d. In Figure 6, the first filter capacitor 111 electrically connected to the second conductor layer 112c and the third conductor layer 112d is represented by C2.
[0064] In this embodiment, by connecting different conductor layers in the stacked busbar 112 to the positive bus voltage V+, the bus median voltage VN, and the negative bus voltage V- respectively, and connecting multiple first filter capacitors 111 between the first conductor layer 112a and the second conductor layer 112c, and multiple first filter capacitors 111 between the second conductor layer 112c and the third conductor layer 112d, the second voltage between the first conductor layer 112a and the second conductor layer 112c, and between the second conductor layer 112c and the third conductor layer 112d, is lower (less than the first voltage), which satisfies the operating voltage requirements of these first filter capacitors 111. Alternatively, the stacked busbar 112 in this embodiment can classify the bus voltage, and the classified voltage can match the operating voltage of these first filter capacitors 111, enabling them to operate normally. It is understood that in another embodiment, the capacitor module 11 design of this embodiment may not be used; normal operation of the capacitor module 11 can be achieved by reasonably setting the bus voltage and / or selecting first filter capacitors 111 with larger operating voltages.
[0065] Figure 7 illustrates a cross-sectional view of the stacked busbar 112 in another embodiment. As shown in Figure 7, the stacked busbar 112 may include a first conductor layer 112a, a third conductor layer 112d, and two second conductor layers 112c. One second conductor layer 112c, the first conductor layer 112a, the third conductor layer 112d, and the other second conductor layer 112c may be stacked sequentially along a first direction (e.g., the Y direction). The two second conductor layers 112c may be the outermost layers of the stacked busbar 112. For example, the first conductor layer 112a may be connected to the positive busbar, both second conductor layers 112c may be connected to the neutral line, and the third conductor layer 112d may be connected to the negative busbar. V+, VN, and V- can be used to represent the positive busbar voltage, the busbar neutral voltage, and the negative busbar voltage connected to the first conductor layer 112a, the two second conductor layers 112c, and the third conductor layer 112d, respectively. When the stacked busbar 112 is in operation, there may be a first voltage between the first conductor layer 112a and the third conductor layer 112d, which may be, for example, 1500V; there may be a second voltage between the upper second conductor layer 112c and the first conductor layer 112a, which may be half of the first voltage, for example, 750V; there may be the second voltage between the lower second conductor layer 112c and the third conductor layer 112d, for example, 750V.
[0066] Referring to Figure 7, the first conductor layer 112a, connected to the positive bus voltage V+, is adjacent to the second conductor layer 112c, which connects to the bus midpoint voltage VN. These two layers form an inductive coupling loop, thereby reducing stray inductance between the positive bus and the neutral line in the circuit. Similarly, the third conductor layer 112d, connected to the negative bus voltage V-, is adjacent to the second conductor layer 112c, which connects to the bus midpoint voltage VN. These two layers also form an inductive coupling loop, further reducing stray inductance between the negative bus and the neutral line in the circuit. By reducing stray inductance, voltage fluctuations and overshoot in the power converter 1 can be reduced, electromagnetic interference can be decreased, system reliability can be improved, system performance can be optimized, and the installation and maintenance of the power converter 1 can be facilitated.
[0067] Referring to Figures 5 and 7, the multiple first filter capacitors 111 on the stacked busbar 112 can be electrically connected to the first conductor layer 112a and the upper second conductor layer 112c, or in other words, one end of each of these first filter capacitors 111 is connected to the first conductor layer 112a and the other end is connected to the upper second conductor layer 112c. In Figure 7, the first filter capacitor 111 electrically connected to the first conductor layer 112a and the upper second conductor layer 112c is represented by C1. The multiple first filter capacitors 111 on the stacked busbar 112 can also be electrically connected to the lower second conductor layer 112c and the third conductor layer 112d, or in other words, one end of each of these first filter capacitors 111 is connected to the lower second conductor layer 112c and the other end is connected to the third conductor layer 112d. In Figure 7, the first filter capacitor 111 electrically connected to the lower second conductor layer 112c and the third conductor layer 112d is represented by C2.
[0068] In the embodiment shown in Figure 7, by connecting different conductor layers in the stacked busbar 112 to the positive bus voltage V+, the bus median voltage VN, and the negative bus voltage V- respectively, and connecting multiple first filter capacitors 111 between the first conductor layer 112a and the second conductor layer 112c, and multiple first filter capacitors 111 between the second conductor layer 112c and the third conductor layer 112d, the second voltage between the first conductor layer 112a and the second conductor layer 112c, and between the second conductor layer 112c and the third conductor layer 112d, is lower (less than the first voltage), which can meet the operating voltage requirements of these first filter capacitors 111. Alternatively, the stacked busbar 112 in this embodiment can classify the bus voltage, and the classified voltage can match the operating voltage of these first filter capacitors 111, enabling these first filter capacitors 111 to operate normally. It is understood that in another embodiment, the design of the capacitor module 11 in this embodiment may not be adopted. The normal operation of the capacitor module 11 can be achieved by reasonably setting the bus voltage and / or selecting a first filter capacitor 111 with a larger operating voltage.
[0069] Referring to Figures 5 and 7, all the first filter capacitors 111 in the capacitor module 11 can be arranged on one of the second conductor layers 112c. Since the second conductor layer 112c can be connected to the bus midpoint voltage VN, this helps to reduce the creepage distance of the first filter capacitors 111, which can meet the safety requirements.
[0070] The above description uses a stacked busbar with current-carrying board 112 as an example. However, the embodiments of this application are not limited to this; any busbar capable of achieving high current carrying capacity can be used as the current-carrying board 112. For example, in one embodiment, the current-carrying board 112 can be a printed circuit board (PCB) composite busbar, which may include a conductor layer, an insulating dielectric layer, and a PCB stacked sequentially. The insulating dielectric layer connects the conductor layer and the PCB. The thickness of the conductor layer can be greater than or equal to 1 mm, such as 1 mm or 1.5 mm. This relatively thick conductor layer can carry a larger current, and its combination with the PCB enables the PCB composite busbar to have a high current carrying capacity. Alternatively, in another embodiment, a PCB with a high current carrying capacity can be used as the current-carrying board 112.
[0071] As shown in Figure 4, the power module 12 can be fixed to the evaporator 14, for example, by screws. By directly placing the power module 12 on the surface of the evaporator 14, sufficient heat dissipation can be achieved for the power module 12, which generates a large amount of heat, thus ensuring its operating performance. The power module 12 may include a DC-DC power module 121 and a DC-AC power module 122, which can be along a second direction (e.g., the Z-axis) and have a certain spacing. The DC-DC power module 121 can be used to implement DC-DC conversion (e.g., boost conversion). The DC-AC power module 122 can be used for DC-AC conversion.
[0072] Figure 8 shows a top view of the power converter 1, excluding components such as the capacitor module 11 and the condenser 16. As shown in Figure 8, the power converter 1 can output three-phase AC power, with three power modules 12 corresponding to phases A, B, and C arranged along the X-direction. The DC-DC power module 121 may have a connection hole 121a, and the DC-AC power module 122 may have a connection hole 122a. Both connection holes 121a and 122a can be aligned with through holes 112z at different positions on the current-carrying plate 112, allowing the connector 17 to pass through the through holes 112z, 121a, and 122a, thus fixing the current-carrying plate 112 and the power modules 12 together and achieving electrical connection between the current-carrying plate 112 and the power modules 12.
[0073] As shown in Figure 4, along the first direction (e.g., the Y-axis), both the DC-DC power module 121 and the DC-AC power module 122 can overlap with the capacitor module 11. In other words, the projection of the capacitor module 11 in the first direction can overlap with both the DC-DC power module 121 and the DC-AC power module 122. This layout increases the layout density, saves layout space, and helps reduce the size of the power converter 1. Since there are no other components between the DC-DC power module 121 and the DC-AC power module 122, they can be arranged close together, shortening the current path between them. This significantly reduces the heat generated by the power converter 1, allowing it to support higher power and reducing current losses.
[0074] As shown in Figure 4, the first filter capacitor 111 in capacitor module 11 is electrically connected to the current-carrying plate 112. The current-carrying plate 112 can be electrically connected to both the DC-DC power module 121 and the DC-AC power module 122 via connector 17. Therefore, the first filter capacitor 111 is electrically connected to both the DC-DC power module 121 and the DC-AC power module 122, or in other words, capacitor module 11 is electrically connected to both the DC-DC power module 121 and the DC-AC power module 122. The first filter capacitor 111 can be used to filter the current output by the DC-DC power module 121.
[0075] As shown in Figure 4, the evaporator 14 may be provided with a channel 14a, which may extend through the evaporator 14 in a first direction (e.g., the Y direction). The channel 14a may be a through-hole with a full circumferential sidewall, and it is a certain distance from the side of the evaporator 14 (e.g., the lower side in Figure 4); or, the channel 14a may be an open groove that extends through the side of the evaporator 14 (e.g., the lower side in Figure 4). The channel 14a is located in the non-flow channel area of the evaporator 14 to avoid affecting the flow of the working fluid within the flow channel. As shown in Figure 8, there may be multiple channels 14a; for example, Figure 8 illustrates three channels 14a at the lower part of the evaporator 14. It is understood that the number and position of the channels 14a shown in Figure 8 are merely examples, and the embodiments of this application are not limited thereto. For example, referring to Figure 8, in one embodiment, three channels 14a may also be provided at the upper part of the evaporator 14, so that a total of six channels 14a can be provided on the evaporator 14.
[0076] As shown in Figures 4 and 8, a plurality of through holes 10b can be formed in the sidewall 10a, and these through holes 10b can be distributed in the upper and lower parts of the sidewall 10a. For example, each through hole 10b in the lower part of the sidewall 10a can be aligned with a channel 14a. In one embodiment, a channel 14a can also be provided in the upper part of the evaporator 14, in which case each through hole 10b in the upper part of the sidewall 10a can be aligned with a channel 14a.
[0077] As shown in Figures 4 and 8, the conductor 13 may include a first conductor 131 and a second conductor 132. For example, the first conductor 131 may pass through the channel 14a and the through-hole 10b, and connect the DC-DC power module 121 and the DC-DC power inductor 151; the second conductor 132 may pass through the through-hole 10b, and connect the DC-AC power module 122 and the DC-AC power inductor 152. Thus, the power module 12 can be connected to the power inductor 15 via the conductor 13. This method results in a shorter power link and current path, reducing current flow risk, heat generation, and losses, as well as reducing parasitic inductance. Furthermore, allowing the first conductor 131 to pass through the evaporator 14 and connect the DC-DC power module 121 and the DC-DC power inductor 151 via the sidewall 10a allows for adaptation to the design of a longer lower part and a larger area of the evaporator 14, facilitating improved heat conduction and dissipation of the power module 12 by the evaporator 14.
[0078] As shown in Figure 4, in one embodiment, the upper part of the evaporator 14 can be approximately flush with the condenser 16. This upper part may not have a channel 14a, and it can be offset from the DC-AC power inductor 152 along the Z-direction. The second wire 132 passes only through the through-hole 10b and connects the DC-AC power module 122 and the DC-AC power inductor 152. Given a fixed size for the evaporator 14 and condenser 16, this design allows the condenser 16 to be arranged relatively high along the Z-direction (e.g., the height direction of the power converter 1 in its operating position), which facilitates the natural reflux of the liquid working fluid within the condenser 16 under gravity, ensuring reliable heat exchange circulation.
[0079] Referring to Figures 4 and 8, in another embodiment, the upper part of the evaporator 14 can be extended, and a channel 14a can be formed in the upper part. This channel 14a is aligned with the through hole 10b on the side wall 10a. The second wire 132 can pass through the channel 14a and the through hole 10b, and connect the DC-AC power module 122 and the DC-AC power inductor 152. This embodiment can further increase the area of the evaporator 14, which is beneficial to improving the heat conduction and heat dissipation effect of the evaporator 14 on the power module 12.
[0080] Referring to Figure 4, in another embodiment, the channel 14a and / or through-hole 10b may be omitted, and the wire 13 can be directly connected to the power module 12 and the power inductor 15 in a suitable manner. For example, the power inductor 15 can be located on the outer side of the sidewall 10a, and the first wire 131 can pass through the through-hole 10b, bypass the edge of the evaporator 14, and connect the DC-DC power module 121 and the DC-DC power inductor 151. Alternatively, the power inductor 15 can also be located on the inner side of the sidewall 10a, and the first wire 131 can bypass the edge of the evaporator 14 and connect the DC-DC power module 121 and the DC-DC power inductor 151; or, the first wire 131 can pass through the channel 14a and connect the DC-DC power module 121 and the DC-DC power inductor 151. Or, in another embodiment, the power module 12 and the power inductor 15 can be electrically connected in any suitable manner, not limited to a direct connection via the wire 13.
[0081] The working principle of power converter 1 is briefly explained below.
[0082] Referring to Figure 4, in this embodiment, the DC-DC power inductor 151 can smooth the current waveform and remove voltage noise from the input DC power, and can also adjust the voltage and current to ensure the stable operation and efficient conversion of the power converter 1. The DC-DC power module 121 can perform DC-DC conversion on the DC power processed by the DC-DC power inductor 151 and output DC power. The first filter capacitor 111 can filter the DC power output by the DC-DC power module 121. The DC power processed by the first filter capacitor 111 can be converted into AC power by the DC-AC power module 122. The DC-AC power inductor 152 can smooth the current waveform and remove voltage noise from the AC power, and can also adjust the voltage and current to ensure the stable operation and efficient conversion of the power converter 1. After subsequent filtering and other processing, the power converter 1 can output AC power to the power grid or load.
[0083] Based on the above embodiments, FIG9 illustrates a partial AA cross-sectional view of the power converter 1 in another embodiment, FIG10 is a schematic diagram of the capacitor module 11 in FIG9 along the B direction, and FIG11 is a schematic diagram of the CC cross-sectional view of the current-carrying plate 112 shown in FIG10. In this embodiment, the current-carrying plate 112 can be a stacked busbar, hereinafter referred to as the stacked busbar 112.
[0084] As shown in Figures 10 and 11, the stacked busbar 112, in addition to the first conductor layer 112a, the second conductor layer 112c, the third conductor layer 112d, and two insulating dielectric layers 112b, may also include a fourth conductor layer 112e, a fifth conductor layer 112f, and a sixth conductor layer 112g. Exemplarily, the fourth conductor layer 112e, the fifth conductor layer 112f, and the sixth conductor layer 112g may be located on the same layer as the first conductor layer 112a; that is, the fourth conductor layer 112e, the fifth conductor layer 112f, and the sixth conductor layer 112g may also be disposed on the upper insulating dielectric layer 112b in Figure 11. In another embodiment, the relative positions of the fourth conductor layer 112e, the fifth conductor layer 112f, the sixth conductor layer 112g, the first conductor layer 112a, the second conductor layer 112c, and the third conductor layer 112d can be determined as needed and are not limited to those described above.
[0085] As shown in Figures 10 and 11, the fourth conductor layer 112e, the fifth conductor layer 112f, and the sixth conductor layer 112g are separated from and insulated from each other, and are also separated from and insulated from the first conductor layer 112a. It can be understood that the fourth conductor layer 112e, the fifth conductor layer 112f, and the sixth conductor layer 112g are also separated from and insulated from the second conductor layer 112c and the third conductor layer 112d.
[0086] In this embodiment, the fourth conductor layer 112e can be used to connect the A-phase line, and can be represented by VA. The fifth conductor layer 112f can be used to connect the B-phase line, and can be represented by VB. The sixth conductor layer 112g can be used to connect the C-phase line, and can be represented by VC.
[0087] As shown in Figures 9 and 10, in this embodiment, the capacitor module 11 may further include a second filter capacitor 113. There may be multiple second filter capacitors 113, all of which can be arranged on the stacked busbar 112 and electrically connected to it. The second filter capacitors 113 may be located on the same side of the stacked busbar 112 as the first filter capacitor 111. For example, several second filter capacitors 113 may be arranged on the fourth conductor layer 112e, several second filter capacitors 113 may be arranged on the fifth conductor layer 112f, and several second filter capacitors 113 may be arranged on the sixth conductor layer 112g.
[0088] Referring to Figures 10 and 11, at least one second filter capacitor 113 can be electrically connected between the fourth conductor layer 112e and the second conductor layer 112c, or in other words, one end of these second filter capacitors 113 is connected to the fourth conductor layer 112e, and the other end is connected to the second conductor layer 112c. In Figure 11, the second filter capacitor 113 that electrically connects the fourth conductor layer 112e and the second conductor layer 112c is represented by C3.
[0089] Referring to Figures 10 and 11, in this embodiment, at least one second filter capacitor 113 can be electrically connected to the fifth conductor layer 112f and the second conductor layer 112c, or in other words, one end of these second filter capacitors 113 is connected to the fifth conductor layer 112f, and the other end is connected to the second conductor layer 112c. The second filter capacitor 113 electrically connected to the fifth conductor layer 112f and the second conductor layer 112c can be represented by C4.
[0090] Referring to Figures 10 and 11, in this embodiment, at least one second filter capacitor 113 can be electrically connected to the sixth conductor layer 112g and the second conductor layer 112c, or in other words, one end of these second filter capacitors 113 is connected to the sixth conductor layer 112g, and the other end is connected to the second conductor layer 112c. The second filter capacitor 113 electrically connected to the sixth conductor layer 112g and the second conductor layer 112c can be represented by C5.
[0091] As shown in Figure 9, the stacked busbar 112 can be electrically connected to the DC-AC power inductor 152 via wire 18, allowing the second filter capacitor 113 to be electrically connected to the DC-AC power inductor 152. The second filter capacitor 113 can be used to filter the AC power output from the DC-AC power inductor 152 again. For example, the AC power filtered by the second filter capacitor 113 can be output to the power grid or load via an AC output assembly, which can be in the form of a printed circuit board assembly (PCBA).
[0092] In this embodiment, by also arranging the second filter capacitor 113 on the stacked busbar 112, the second filter capacitor 113 can share the second conductor layer 112c of the connection bus median voltage VN with the first filter capacitor 111, or in other words, share the N line, which can also improve the filtering quality. By setting the fourth conductor layer 112e, the fifth conductor layer 112f, and the sixth conductor layer 112g on the stacked busbar 112, a three-phase output path can be formed on the stacked busbar 112, which can adapt to the design of arranging the second filter capacitor 113 on the stacked busbar 112, so that the power converter 1 can work normally.
[0093] Based on the embodiments shown in Figures 7 and 11, Figure 12 illustrates a CC cross-sectional view of the stacked busbar 112 in another embodiment.
[0094] Referring to Figures 10 and 12, the stacked busbar 112 may include a first conductor layer 112a, a third conductor layer 112d, and two second conductor layers 112c, as well as a fourth conductor layer 112e, a fifth conductor layer, and a sixth conductor layer. Exemplarily, the fourth conductor layer 112e, the fifth conductor layer, and the sixth conductor layer may be located on the same layer as the first conductor layer 112a. In another embodiment, the relative positions of the fourth conductor layer 112e, the fifth conductor layer 112f, the sixth conductor layer 112g, the first conductor layer 112a, the second conductor layer 112c, and the third conductor layer 112d can be determined as needed and are not limited to those described above.
[0095] As shown in Figure 12, in this embodiment, the fourth conductor layer 112e can be used to connect the A phase line, and can be represented by VA. The fifth conductor layer can be used to connect the B phase line, and the sixth conductor layer 112g can be used to connect the C phase line.
[0096] Referring to Figure 12, in this embodiment, the second filter capacitor 113 can be disposed on the same side of the stacked busbar 112 as the first filter capacitor 111. For example, the second filter capacitor 113 and the first filter capacitor 111 can be arranged on one of the second conductor layers 112c.
[0097] Referring to Figure 12, at least one second filter capacitor 113 can be electrically connected to the fourth conductor layer 112e and the second conductor layer 112c, or in other words, one end of these second filter capacitors 113 is connected to the fourth conductor layer 112e and the other end is connected to the second conductor layer 112c. In Figure 12, the second filter capacitor 113 electrically connected to the fourth conductor layer 112e and the second conductor layer 112c is represented by C3. In this embodiment, at least one second filter capacitor 113 can be electrically connected to the fifth conductor layer and the second conductor layer 112c, or in other words, one end of these second filter capacitors 113 is connected to the fifth conductor layer and the other end is connected to the second conductor layer 112c. The second filter capacitor 113 electrically connected to the fifth conductor layer and the second conductor layer 112c can be represented by C4. In this embodiment, at least one second filter capacitor 113 can be electrically connected to the sixth conductor layer and the second conductor layer 112c, or in other words, one end of these second filter capacitors 113 is connected to the sixth conductor layer and the other end is connected to the second conductor layer 112c. The second filter capacitor 113, which electrically connects the sixth conductor layer and the second conductor layer 112c, can be represented by C5.
[0098] In this embodiment, different conductor layers in the stacked busbar 112 are respectively connected to the positive bus voltage V+, the bus mid-voltage VN, the negative bus voltage V-, and the ABC three-phase lines. Multiple first filter capacitors 111 are connected between the first conductor layer 112a and the second conductor layer 112c; a first filter capacitor 111 is connected between the second conductor layer 112c and the third conductor layer 112d; a second filter capacitor 113 is connected between the fourth conductor layer 112e and the second conductor layer 112c; and a second filter capacitor 113 is connected between the fifth conductor layer and the second conductor layer 112c. The second filter capacitor 113, connected between the sixth conductor layer and the second conductor layer 112c, not only allows for the grading of the bus voltage, ensuring that the graded voltage matches the operating voltage of the first filter capacitors 111, thus enabling the first filter capacitors 111 to operate normally; it also allows both the first filter capacitors 111 and the second filter capacitor 113 to be arranged on the second conductor layer 112c connected to the bus median voltage VN, which helps reduce the creepage distance between the first filter capacitors 111 and the second filter capacitor 113, meeting safety requirements. It is understood that in this embodiment, by also arranging the second filter capacitor 113 on the laminated busbar 112, the second filter capacitor 113 can share the N line with the first filter capacitor 111, improving the filtering quality. By setting a fourth conductor layer 112e, a fifth conductor layer 112f, and a sixth conductor layer 112g on the stacked busbar 112, a three-phase output path can be formed on the stacked busbar 112, which can be adapted to the design of arranging the second filter capacitor 113 on the stacked busbar 112, so that the power converter 1 can work normally.
[0099] It is understood that, in another embodiment, depending on product requirements, the design of arranging the second filter capacitor 113 on the stacked busbar 112 may not be adopted, and the three-phase output paths such as the fourth conductor layer 112e, the fifth conductor layer 112f, and the sixth conductor layer 112g need not be provided on the stacked busbar 112. Exemplarily, both the second filter capacitor 113 and the three-phase output paths can be provided in the AC output component.
[0100] The embodiments shown in Figures 9-12 illustrate a stacked busbar with a current-carrying carrier 112 as an example. However, the embodiments of this application are not limited to this, and any carrier capable of achieving high current carrying capacity can be used as the current-carrying carrier 112. For example, in one embodiment, the current-carrying carrier 112 can be a PCB composite busbar, which may include a conductor layer, an insulating dielectric layer, and a PCB stacked sequentially. The insulating dielectric layer connects the conductor layer and the PCB. The thickness of the conductor layer can be greater than or equal to 1 mm, such as 1 mm, 1.5 mm, etc. This relatively thick conductor layer can carry a large current, and its combination with the PCB can give the PCB composite busbar a high current carrying capacity. Alternatively, in another embodiment, a PCB with high current carrying capacity can be used as the current-carrying carrier 112.
[0101] Figure 13 illustrates a circuit diagram of a power converter 1 in one embodiment. Exemplarily, Figure 13 corresponds to the power converter 1 shown in Figure 9. Referring to Figures 9 and 13, inductors L1 to L3 can all correspond to DC-DC power inductors 151, the DC-DC power module can correspond to DC-DC power module 121, capacitors C1 to C2 can correspond to the first filter capacitor 111, V+, VN, and V- can correspond to the first conductor layer 112a, the second conductor layer 112c, and the third conductor layer 112d, respectively, the DC-AC power module can correspond to the DC-AC power module 122, inductors L4 to L6 can correspond to DC-AC power inductors 152, capacitors C3 to C5 can correspond to the second filter capacitor 113, and VA, VB, and VC can correspond to the fourth conductor layer 112e, the fifth conductor layer 112f, and the sixth conductor layer 112g, respectively.
[0102] Referring to Figure 13, in this embodiment, inductors L1 to L3 (DC-DC power inductors 151) can smooth the current waveform and remove voltage noise from the input DC power, and can also adjust the voltage and current to ensure stable operation and efficient conversion of the power converter 1. The DC-DC power module (DC-DC power module 121) can perform DC-DC conversion on the DC power processed by inductors L1 to L3 (DC-DC power inductors 151) and output DC power. Capacitors C1 to C2 (first filter capacitors 111) can filter the DC power output by the DC-DC power module (DC-DC power module 121). The DC power processed by capacitors C1 to C2 (first filter capacitors 111) can be converted into AC power by the DC-AC power module (DC-AC power module 122). Inductors L4 to L6 (DC-AC power inductors 152) can smooth the current waveform and remove voltage noise from the AC power, and can also adjust the voltage and current to ensure stable operation and efficient conversion of the power converter 1. Capacitors C3 to C5 (second filter capacitors 113) can be used to filter the AC power output from inductors L4 to L6 (DC-AC power inductors 152) again. For example, the AC power filtered by capacitors C3 to C5 (second filter capacitors 113) can be output to the power grid or load through the AC output component.
[0103] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.
[0104] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as implying relative importance or implicitly indicating the number of technical features indicated. Features specified as "first" or "second" may explicitly or implicitly include one or more of that feature.
[0105] The term "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to a mechanical connection or an electrical connection. Similarly, "fixing" should also be interpreted broadly. For example, "fixing" can be direct fixing or indirect fixing through an intermediate medium.
[0106] The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," "top," and "bottom," are only for reference to the directions in the accompanying drawings. These directional terms are used to better and more clearly explain and understand the embodiments of this application, and are not intended to explicitly or implicitly suggest that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, etc., and therefore should not be construed as limiting the embodiments of this application.
[0107] In the description of the embodiments in this application, unless otherwise stated, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.
[0108] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A power converter, characterized in that, It includes a capacitor module, a power module, and a power inductor, wherein the capacitor module, the power module, and the power inductor are arranged sequentially along a first direction; The power module includes a DC-DC power module and a DC-AC power module, the DC-DC power module and the DC-AC power module are arranged along a second direction, the second direction intersecting the first direction; the projection of the capacitor module in the first direction overlaps with both the DC-DC power module and the DC-AC power module; the capacitor module is electrically connected to both the DC-DC power module and the DC-AC power module; The power inductor includes a DC-DC power inductor and a DC-AC power inductor, which are arranged along the second direction. The DC-DC power inductor is electrically connected to the DC-DC power module, and the DC-AC power inductor is electrically connected to the DC-AC power module.
2. The power converter according to claim 1, characterized in that, The power converter also includes an evaporator and a condenser, the evaporator and the condenser being connected; The power module is located on the evaporator, and the capacitor module, the power module, the evaporator and the power inductor are arranged sequentially along the first direction, while the condenser and the power inductor are arranged along the second direction.
3. The power converter according to claim 2, characterized in that, The power converter further includes a first wire and a second wire, the first wire connecting the DC-DC power inductor and the DC-DC power module, and the second wire connecting the DC-AC power inductor and the DC-AC power module.
4. The power converter according to claim 3, characterized in that, The evaporator is provided with a channel that extends through the evaporator along the first direction, and the first wire or the second wire passes through the channel; Alternatively, the evaporator may have two channels, both of which extend through the evaporator along the first direction, with the first wire and the second wire each passing through one of the channels.
5. The power converter according to any one of claims 2-4, characterized in that, The power converter also includes a housing, in which the capacitor module, the power module and the evaporator are all disposed, and at least a portion of the power inductor and at least a portion of the condenser are disposed outside the housing.
6. The power converter according to claim 5, characterized in that, The housing is provided with two through holes; The power converter further includes a first wire and a second wire. The first wire passes through one of the through holes and connects the DC-DC power inductor and the DC-DC power module. The second wire passes through another through hole and connects the DC-AC power inductor and the DC-AC power module.
7. The power converter according to any one of claims 1-6, characterized in that, The capacitor module includes a first filter capacitor and a current-carrying plate. The first filter capacitor is disposed on the current-carrying plate. The first filter capacitor, the current-carrying plate, the power module, and the power inductor are arranged sequentially along the first direction. The current-carrying plate is electrically connected to the first filter capacitor, the DC-DC power module, and the DC-AC power module. The current-carrying plate includes a conductor layer, the thickness of which is greater than or equal to 1 mm.
8. The power converter according to claim 7, characterized in that, The current-carrying plate is a stacked busbar, which includes a plurality of conductor layers stacked sequentially along the first direction.
9. The power converter according to claim 8, characterized in that, The plurality of conductor layers in the stacked busbar include a first conductor layer, a second conductor layer and a third conductor layer. A first voltage exists between the first conductor layer and the third conductor layer. A second voltage exists between the second conductor layer and the first conductor layer. A second voltage exists between the second conductor layer and the third conductor layer. The second voltage is half of the first voltage. The power converter includes a plurality of first filter capacitors electrically connected to the first conductor layer and the second conductor layer, and a plurality of first filter capacitors electrically connected to the second conductor layer and the third conductor layer.
10. The power converter according to claim 9, characterized in that, The stacked busbar includes two second conductor layers, wherein one second conductor layer, the first conductor layer, the third conductor layer, and the other second conductor layer are stacked sequentially along the first direction; All of the first filter capacitors in the power converter are arranged on one of the second conductor layers.
11. The power converter according to any one of claims 7-10, characterized in that, The current-carrying plate is a stacked busbar, which includes a plurality of conductor layers stacked sequentially along the first direction; The plurality of conductor layers in the stacked busbar include a first conductor layer, a second conductor layer and a third conductor layer. A first voltage exists between the first conductor layer and the third conductor layer. A second voltage exists between the second conductor layer and the first conductor layer. A second voltage exists between the second conductor layer and the third conductor layer. The second voltage is half of the first voltage. The plurality of conductor layers in the stacked busbar further include a fourth conductor layer, a fifth conductor layer and a sixth conductor layer, wherein the fourth conductor layer is used to connect phase A, the fifth conductor layer is used to connect phase B, and the sixth conductor layer is used to connect phase C; The power converter further includes a plurality of second filter capacitors disposed on the current-carrying plate, wherein at least one second filter capacitor is electrically connected to the fourth conductor layer and the second conductor layer, at least one second filter capacitor is electrically connected to the fifth conductor layer and the second conductor layer, and at least one second filter capacitor is electrically connected to the sixth conductor layer and the second conductor layer.
12. A power supply system, characterized in that, Includes the power converter according to any one of claims 1-11, the power converter being used to connect a DC power source and a power grid.
13. The power supply system according to claim 12, characterized in that, The power supply system includes a plurality of power converters, the AC sides of which are connected in parallel to the power grid.