Busbar filtering system and power equipment
By employing separate rectifier-inverter integrated devices and bus filter circuits in power equipment, the interference problem caused by direct connection between the rectifier-side bus and the inverter-side bus is solved, achieving a more absolute filtering path and better dynamic response.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN HOPEWIND ELECTRIC CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-07-03
AI Technical Summary
In the existing technology, the rectifier side bus and the inverter side bus are directly connected through the PCB, which causes high-frequency noise and feedback energy to propagate directly, causing interference problems.
The rectifier and inverter integrated device is separated. The rectifier circuit network and the inverter circuit network are distributed in isolation on the PCB board and connected by a bus filter circuit. The filter circuit includes multiple parallel filter capacitor branches and high-frequency capacitors. The filter path is absolute to avoid direct interference.
It reduces direct interference between the rectifier circuit network and the inverter circuit network, reduces filtering delay, improves dynamic response and overall performance, and is suitable for power equipment with limited installation space.
Smart Images
Figure CN224459648U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power electronic device technology, and in particular to a bus filter system and power equipment. Background Technology
[0002] With advancements in semiconductor technology, devices such as IGBTs (Insulated-Gate Bipolar Transistors) and silicon carbide have become more efficient and smaller, allowing for more compact rectifier and inverter circuit designs. However, capacitor technology has not yet reached the same level of size and capacity. Therefore, to meet the international energy efficiency standards for electrical equipment and the trend towards lightweighting and miniaturization, external capacitor board designs are commonly used. This allows for easier adjustment of capacitor capacity to meet different power requirements, reduces heat generation during rectification and inversion, improves heat dissipation, extends overall lifespan, and facilitates installation and maintenance.
[0003] In the existing technology, the rectifier side bus and the inverter side bus are usually directly connected through the PCB, and the capacitor is externally connected in parallel to the bus for filtering. However, this solution has the following drawbacks: high-frequency noise on the inverter side, such as switching harmonics and feedback energy, can be directly propagated to the rectifier side and other bus junction circuits through the low impedance PCB path, which can easily cause interference. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a bus filter system and power equipment to solve the interference problem caused by the bus filter path.
[0005] To address the aforementioned technical problems, in a first aspect, a bus filtering system is provided, comprising:
[0006] The rectifier-inverter integrated device includes a separate rectifier circuit network and an inverter circuit network, wherein the input side of the rectifier circuit network and the output side of the inverter circuit network are respectively connected to an external AC power supply and a load;
[0007] A connecting device, comprising a first connecting component and a second connecting component;
[0008] The bus filter circuit is electrically connected to the output side of the rectifier circuit network and the input side of the inverter circuit network through the first connection component and the second connection component, respectively, to form a loop for filtering the bus voltage.
[0009] A further technical solution is as follows: the bus filter circuit includes multiple parallel filter capacitor branches, and all of the multiple filter capacitor branches are close to the inverter circuit network.
[0010] The further technical solution is as follows: each of the filter capacitor branches includes multiple electrolytic capacitors connected in series.
[0011] A further technical solution is as follows: the bus filter system further includes at least one high-frequency capacitor, which is connected in parallel to the input side of the inverter circuit network.
[0012] The further technical solution is as follows: the rectifier-inverter integrated device also includes a PCB board, and the rectifier circuit network and the inverter circuit network are both located on the PCB board and are distributed in a mutually isolated manner.
[0013] The further technical solution is as follows: the PCB board is also provided with a first connection port, which is distributed in the rectifier circuit network area and connected to the output side of the rectifier circuit network and the first connection component.
[0014] The further technical solution is as follows: the PCB board is also provided with a plurality of second connection ports, the plurality of second connection ports are distributed in the inverter circuit network area, and at least one second connection port is connected to the input side of the inverter circuit network and the second connection component.
[0015] The further technical solution is as follows: the first connection component includes a bus copper pillar, and the input side of the bus filter circuit is connected to the output side wire of the rectifier circuit network through the bus copper pillar.
[0016] A further technical solution is as follows: the second connection component includes a bus copper column, and the input side of the inverter circuit network is connected to the output side wire of the bus filter circuit through the bus copper column.
[0017] In order to solve the above-mentioned technical problems, a second aspect is to provide an electrical device that includes the above-mentioned bus filter system.
[0018] Compared with the prior art, in the rectifier-inverter integrated device of the bus filter system of this utility model, the rectifier circuit network and the inverter circuit network are separated, and the output side of the rectifier circuit network and the input side of the inverter circuit network are connected to the bus filter circuit through the first connection component and the second connection component, respectively. That is, the rectifier side bus and the inverter side bus are not directly connected, which reduces the direct interference between the rectifier circuit network and the inverter circuit network. Moreover, the rectifier side output and the inverter side input must pass through the bus filter circuit, making the filtering path more absolute and avoiding filtering delay interference. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of a specific embodiment of the bus filter system of this utility model.
[0020] Figure 2This is a schematic diagram of the PCB ground plane segmentation of the rectifier-inverter integrated device in the bus filter system of this utility model.
[0021] Figure 3 This is a schematic diagram of the current loop of the filtering path in the bus filter system of this utility model.
[0022] Figure 4 This is a schematic diagram of the layout of the bus filter circuit in the bus filter system of this utility model.
[0023] Figure 5 This is a schematic diagram of the layout of the rectifier-inverter integrated device in the bus filter system of this utility model. Detailed Implementation
[0024] To better understand the technical content of this utility model, the technical solution of this utility model will be further introduced and explained below with reference to the schematic diagram, but it is not limited thereto.
[0025] Reference Figures 1 to 5 , Figures 1 to 5 A specific embodiment of the bus filter system of this utility model is shown. In the embodiment shown in the accompanying drawings, the bus filter system includes a rectifier-inverter integrated device 10, a connecting device, and a bus filter circuit 30. The rectifier-inverter integrated device 10 includes a separated rectifier circuit network 11 and an inverter circuit network 12. The input side of the rectifier circuit network 11 and the output side of the inverter circuit network 12 are respectively connected to an external AC power supply and a load. The connecting device includes a first connecting component 21 and a second connecting component 22. The bus filter circuit 30 is electrically connected to the output side of the rectifier circuit network 11 and the input side of the inverter circuit network 12 through the first connecting component 21 and the second connecting component 22 to form a loop. In this invention, the rectifier circuit network 11 converts the AC power input from an external AC power source (such as the power grid) into DC power. The DC power is transmitted to the bus filter circuit 30 for filtering via the first connection component 21. The filtered bus DC power is then transmitted to the inverter circuit network 12 via the second connection component 22, where the inverter circuit network 12 converts the input bus DC power into variable AC power for supplying the load output. Based on the above design, the rectifier circuit network 11 and the inverter circuit network 12 are separated, which avoids direct connection between the rectifier-side bus and the inverter-side bus, reduces direct interference between the rectifier circuit network 11 and the inverter circuit network 12, and provides a more absolute filtering path, thus avoiding filtering delay interference.
[0026] Specifically, in this embodiment, the rectifier circuit network 11 and the inverter circuit network 12 are circuit networks distributed with inter-board isolation, such as... Figure 2As shown, the rectifier-inverter integrated device 10 also includes a PCB board 13, on which the rectifier circuit network 11 and the inverter circuit network 12 are both located and are distributed in a mutually isolated manner.
[0027] Furthermore, such as Figure 5 As shown, the PCB board 13 is also provided with a first connection port 41 and a plurality of second connection ports 42. The first connection port 41 is distributed in the rectifier circuit network 11 area and is connected to the output side of the rectifier circuit network 11 and the first connection component 21; while the plurality of second connection ports 42 are distributed in the inverter circuit network 12 area, and at least one second connection port 42 is connected to the input side of the inverter circuit network 12 and the second connection component 22, and the remaining second connection ports 42 can be used for the connection of the bus filter circuit 30 to the remaining buses. It can be understood that the bus filter circuit 30 can also be provided with a corresponding number of connection ports (such as...). Figure 4 As shown), and each connection port includes a positive connection terminal and a negative connection terminal.
[0028] In some embodiments, both the first connection component 21 and the second connection component 22 include bus copper pillars. The input side of the bus filter circuit 30 is connected to the output side conductor of the rectifier circuit network 11 through a first connection port 41 located in the region of the rectifier circuit network 11 and the bus copper pillar. The input side of the inverter circuit network 12 is connected to the output side conductor of the bus filter circuit 30 through a second connection port 42 located in the region of the inverter circuit network 12 and the bus copper pillar. The output of the bus filter circuit 30 can also be transmitted to other buses through the remaining second connection ports 42 located in the region of the inverter circuit network 12. Based on the above design, the output side of the rectifier circuit network 11 has only one path to the bus filter circuit 30 via the bus copper pillar of the first connection component 21. After the filtered bus is conducted through the bus copper pillar of the second connection component 22 to the second connection port 42 located in the region of the inverter circuit network 12, it can be used for inversion in the inverter circuit network 12 or applied to other buses besides rectification.
[0029] Continue to refer to Figure 1 In some embodiments, the bus filter circuit 30 includes multiple parallel filter capacitor branches 31, and as shown... Figure 3 As shown, preferably, in this embodiment, the plurality of filter capacitor branches 31 are all close to the inverter circuit network 12, and each filter capacitor branch 31 includes a plurality of electrolytic capacitors C1 connected in series. Based on the above design, the electrolytic capacitors C1 are large-capacity capacitors. The centralized placement of large-capacity capacitors close to the inverter circuit network 12 can reduce the bus impedance on the inverter circuit network 12 side, so as to absorb low-frequency fluctuations and improve dynamic response.
[0030] In some embodiments, such as Figure 1 and Figure 5 As shown, the bus filter system also includes multiple high-frequency capacitors C2, each of which is connected between the positive and negative terminals of a second connection port 42. In this invention, the high-frequency capacitors C2 are small-capacity high-frequency capacitors, which can shorten the high-frequency return path, suppress the switching harmonics and high-frequency interference of the inverter circuit network 12, and also absorb the high-frequency harmonic interference of the external load, thereby improving the overall performance and stability.
[0031] As can be seen from the above, compared with the existing design scheme where the rectifier-side bus and inverter-side bus are directly connected via PCB and the capacitor is externally connected in parallel to the bus for filtering, the bus filtering system of this utility model has forced interference on the filtering path. It can also be applied to power equipment with limited installation space. Specifically, this utility model divides the rectifier circuit network 11 and the inverter circuit network 12. The rectifier circuit network 11 and the inverter circuit network 12 are distributed in an inter-board isolated state on the PCB board 13. The output side of the rectifier circuit network 11 has only one path to the bus copper pillar of the first connecting component 21 to the bus filtering circuit 30. The filtered bus is conducted to the inverter circuit network 12 area through the bus copper pillar of the second connecting component 22. The filtering path is more absolute, reducing the filtering delay. The delayed filtering avoids bus fluctuations and other interference caused by the delay, and also prevents direct connection between the DC bus on the output side of the rectifier circuit network 11 and the DC bus on the input side of the inverter circuit network 12, reducing direct interference between the rectifier circuit network 11 and the inverter circuit network 12. Furthermore, the large-capacity filter capacitor in the bus filter circuit 30 is close to the inverter circuit network 12, reducing the inverter-side bus impedance to absorb low-frequency fluctuations, thus giving the inverter circuit network 12 better dynamic response and low-frequency filtering and voltage regulation. Simultaneously, a small-capacity high-frequency capacitor C2 is provided in the inverter circuit network 12 to absorb high-frequency harmonic interference from the external load and the inverter circuit network 12 with a shorter high-frequency return path, further improving the overall performance and stability of the bus filter system.
[0032] Understandably, this utility model can also provide a power device, which includes the bus filter system described in the above embodiments. This power device can be a photovoltaic inverter, a wind power inverter, or a frequency converter, etc. It can convert the AC power input from the power grid into DC power through the rectifier circuit network 11, and then transmit it to the bus filter circuit 30 for filtering through the bus copper column of the first connection component 21. The filtered bus DC power is then transmitted to the inverter circuit network 12 through the bus copper column of the second connection component 22, so that the input bus DC power can be converted into variable AC power through the inverter circuit network 12 to supply the load output and meet different power needs.
[0033] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.
Claims
1. A bus filter system, characterized by, The bus filter system includes: The rectifier-inverter integrated device includes a separate rectifier circuit network and an inverter circuit network, wherein the input side of the rectifier circuit network and the output side of the inverter circuit network are respectively connected to an external AC power supply and a load; A connecting device, comprising a first connecting component and a second connecting component; The bus filter circuit is electrically connected to the output side of the rectifier circuit network and the input side of the inverter circuit network through the first connection component and the second connection component, respectively, to form a loop for filtering the bus voltage.
2. The bus filter system of claim 1, wherein, The bus filter circuit includes multiple parallel filter capacitor branches, all of which are close to the inverter circuit network.
3. The bus filter system of claim 2, wherein, Each of the filter capacitor branches includes multiple electrolytic capacitors connected in series.
4. The bus filter system of claim 1, wherein, The bus filter system also includes at least one high-frequency capacitor connected in parallel to the input side of the inverter circuit network.
5. The bus filter system of claim 1 or 2, wherein, The rectifier-inverter integrated device also includes a PCB board, on which the rectifier circuit network and the inverter circuit network are located and are distributed in a mutually isolated manner.
6. The bus filter system of claim 5, wherein, The PCB board is also provided with a first connection port, which is distributed in the rectifier circuit network area and connected to the output side of the rectifier circuit network and the first connection component.
7. The bus filter system of claim 5, wherein, The PCB board is also provided with a plurality of second connection ports, which are distributed in the inverter circuit network area, and at least one second connection port is connected to the input side of the inverter circuit network and the second connection component.
8. The bus filter system of claim 1, wherein, The first connection component includes a bus copper pillar, and the input side of the bus filter circuit is connected to the output side wire of the rectifier circuit network through the bus copper pillar.
9. The bus filter system of claim 1, wherein, The second connection component includes a bus copper pillar, and the input side of the inverter circuit network is connected to the output side wire of the bus filter circuit through the bus copper pillar.
10. An electrical power device, characterized by The bus filter system includes any one of claims 1-9.