An electrical control box and an outdoor air conditioning unit

Abstract

This application provides an electrical control box and an outdoor unit for an air conditioner. The electrical control box includes a PCB board with an inlet and an outlet terminal, which are respectively located diagonally opposite each other. The PCB board also includes multiple power devices arranged sequentially and connected in series along an L-shaped outer perimeter path from the inlet to the outlet terminal. This application addresses the technical problems of high cost, design complexity, and limited effectiveness of traditional EMI suppression optimization methods.

Description

Technical Field

[0001] This utility model relates to the field of circuit board technology, and more specifically, to an electrical control box and an outdoor unit for an air conditioner. Background Technology

[0002] In existing air conditioner cabinet outdoor unit electrical control systems, the power / signal input terminals and load output terminals of the PCB board are usually arranged on the same side. This traditional layout has many drawbacks, mainly in the following aspects: First, the critical power circuit routing path is long and circuitous, forming a huge high-frequency current loop area. When high-current switching devices are working, they will generate rapidly changing current (di / dt) and voltage (dv / dt). These changes will generate strong conducted and radiated electromagnetic interference (EMI) in the large high-frequency current loop, seriously threatening the electromagnetic compatibility (EMC) of the system. Second, the input and output harnesses are concentrated on one side of the electrical control box, resulting in a high risk of inter-line coupling interference, which exacerbates the difficulty of EMC design.

[0003] However, the relevant technologies have at least one of the following problems: traditional optimization methods often rely on adding filtering components, shielding, or complex wiring rules to suppress EMI, which not only increases cost and design complexity, but also often has limited effectiveness. Utility Model Content

[0004] This invention solves the technical problems of traditional EMI suppression optimization methods, which are characterized by high cost, complex design, and limited effectiveness.

[0005] To solve the above problems, this utility model provides an electrical control box, which includes: a PCB board, the PCB board having an inlet end and an outlet end, the inlet end and the outlet end being respectively located at diagonal positions on the PCB board; wherein, the PCB board also has multiple power devices arranged sequentially and connected in series along the outer peripheral path from the inlet end to the outlet end, the outer peripheral path being L-shaped.

[0006] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: by placing the input and output terminals at opposite corners of the PCB board, the input energy flow and output energy flow are completely decoupled and isolated in physical space; and an L-shaped main current path is formed along the outer periphery from the input terminal to the output terminal, shortening the main current path and compressing the physical size of the critical power loop to the theoretical minimum.

[0007] In one embodiment of this utility model, multiple power devices include a choke, a rectifier bridge, a PFC inductor, an electrolytic capacitor, and an IPM connected in series.

[0008] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: by closely arranging multiple power devices, the area of ​​the high-frequency current loop is effectively reduced, while the length of the LNS connection line is reduced, saving the cost of wire harness materials.

[0009] In one embodiment of this utility model, a quiet zone is also provided on the PCB board, and a sensitive control circuit is arranged in the quiet zone. The quiet zone is isolated from the outer peripheral path.

[0010] Compared with existing technologies, the technical effects achieved by this solution are as follows: the isolation between the quiet zone and the peripheral path enables the sensitive control circuit to operate in a relatively stable electromagnetic environment, avoiding problems such as decreased control accuracy or system failure caused by interference, and improving the stability and reliability of the system.

[0011] In one embodiment of this utility model, a filter circuit is also provided on the PCB board. The filter circuit includes a filter, which is located away from multiple power devices.

[0012] Compared with existing technologies, the technical effects achieved by this technical solution are: the filter is placed far away from multiple power devices, which can avoid interference generated by power devices and prevent secondary coupling of interference.

[0013] In one embodiment of this invention, the parameters of the filter circuit are adjusted according to the EMI curve, and the routing of the filter circuit is adapted to the peripheral path.

[0014] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: due to the improved EMI suppression effect, the dependence on high-priced filter components is reduced, further reducing the system cost.

[0015] In one embodiment of this utility model, the incoming line is located at the upper right corner of the PCB board and the outgoing line is located at the lower left corner of the PCB board; or the incoming line is located at the upper left corner of the PCB board and the outgoing line is located at the lower right corner of the PCB board.

[0016] Compared with the prior art, the technical effect achieved by adopting this technical solution is that this flexible setting can adapt to different electronic control system layout requirements, thus improving the applicability of this utility model.

[0017] In one embodiment of this utility model, the electrical control box is further provided with a wiring compartment, which is used to accommodate the power cord connected to the inlet end and the load cord connected to the outlet end. The power cord and the load cord are arranged separately in the wiring compartment.

[0018] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: within the wiring compartment of the electrical control box, the power lines and load lines are arranged separately, reducing the risk of crosstalk between lines.

[0019] In one embodiment of this utility model, the electrical control box further includes an inner shell on which a PCB board is mounted.

[0020] Compared with existing technologies, the technical effects achieved by adopting this technical solution are: setting up an inner shell for mounting the PCB board, while improving the overall structural strength of the electrical control box.

[0021] On the other hand, this utility model also provides an outdoor unit for an air conditioner, including: a right side plate, on which a wiring window is provided and an electrical bracket is provided at the wiring window, and a terminal block is installed on the electrical bracket; and an electrical control box as described in any of the above embodiments, wherein the electrical control box is connected to the terminal block through an inlet terminal.

[0022] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the terminal block is set inside the wiring window on the right side of the board, the inlet of the PCB board is located on the right side of the PCB board, and the power cord of the control box is connected to the terminal block; the control box is vertically installed, and the thickness direction of the control box is consistent with the front and rear direction of the outdoor unit of the air conditioner.

[0023] In one embodiment of this utility model, the outdoor unit of the air conditioner further includes: a housing assembly, the housing assembly having a receiving cavity; a windproof vertical plate, the windproof vertical plate dividing the receiving cavity into a first cavity and a second cavity, wherein a compressor and an electrical control box are provided in the first cavity, the compressor being located below the electrical control box, and a fan is provided in the second cavity.

[0024] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: the windproof upright plate divides the housing cavity into a first cavity and a second cavity, making the layout of the outdoor unit of the air conditioner neater.

[0025] By adopting the technical solution of this utility model, the following technical effects can be achieved:

[0026] (1) By placing the input and output terminals at opposite corners of the PCB board, the input energy flow and output energy flow are completely decoupled and isolated in physical space; and an L-shaped main current path is formed along the outer periphery path from the input terminal to the output terminal, shortening the main current path and compressing the physical size of the key power loop to the theoretical minimum.

[0027] (2) By closely arranging multiple power devices, the area of ​​the high-frequency current loop is effectively reduced, and the length of the LNS connection line is reduced, saving the cost of wire harness materials.

[0028] (3) The filter is placed far away from multiple power devices to avoid interference from power devices and prevent secondary coupling of interference. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an electrical control box provided in Embodiment 1 of the present utility model;

[0031] Figure 2 This is a schematic diagram of the structure of an outdoor unit of an air conditioner provided in Embodiment 2 of this utility model;

[0032] Figure 3 for Figure 2 A magnified view of region A in the image;

[0033] Figure 4 This is a detailed connection diagram of the circuitry on the PCB board.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Electrical control box; 101. Inlet terminal; 102. Outlet terminal; 103. Quiet zone; 110. Choke; 120. Rectifier bridge; 130. PFC inductor; 140. Electrolytic capacitor; 151. Fan IPM; 152. Compressor IPM; 10. Right side panel; 11. Wiring window; 12. Electrical rack; 20. Air-insulating upright panel; 21. First chamber; 211. Compressor; 22. Second chamber; 30. Chassis. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] In traditional PCB board trace layouts, power / signal inputs and load outputs are typically located on the same side, resulting in long and circuitous trace paths for critical power circuits, creating a large high-frequency current loop area and easily generating strong EMI. This invention, however, employs a novel design concept to effectively solve these problems.

[0038] Example 1

[0039] See Figure 1This utility model provides an electrical control box 100, including: a PCB board, the PCB board having an inlet terminal 101 and an outlet terminal 102, the inlet terminal 101 and the outlet terminal 102 being respectively located at diagonal positions on the PCB board; wherein, the PCB board also has a plurality of power devices arranged sequentially and connected in series along the outer peripheral path from the inlet terminal 101 to the outlet terminal 102, the outer peripheral path being L-shaped.

[0040] In one specific embodiment, the PCB board has an input terminal 101 and an output terminal 102. To achieve complete decoupling and isolation of the input and output energy flows in physical space, the input terminal 101 and the output terminal 102 are located diagonally opposite each other on the PCB board. The input terminal 101 is connected to the power supply / signal via a power line, and the output terminal 102 is connected to the load via a load line. An L-shaped main current path is formed along the outer periphery of the input terminal 101 to the output terminal 102. This L-shaped path is the shortest and straightest current path, which can compress the physical size of the critical power loop to a theoretical minimum. By arranging multiple power devices closely along the L-shaped path, the current path during transmission can be minimized. Compared with the long, circuitous traces that need to "cross" the PCB board in the traditional same-side layout, this avoids the circuitous traces in the traditional layout, thereby effectively reducing the area of ​​the high-frequency current loop and reducing the length of the LNS connection line, saving on wiring harness material costs.

[0041] Therefore, this application proposes and implements a "diagonally separated L-shaped ultra-short path layout" scheme. Through spatial topology reconstruction and collaborative design of the power control box 100, the traditional parallel coupling of wiring and filter circuit is improved. This application can compress the physical size (length and surrounding area) of the critical power loop to the theoretical minimum, fundamentally reducing the area of ​​the high-frequency current loop, thereby significantly reducing the generation of EMI.

[0042] Preferably, the corners of the L-shaped outer peripheral path are provided with rounded corner transition structures. The radius of the rounded corners can be designed according to the actual current size and the size of the PCB board. The rounded corner transition structure can reduce current reflection and loss at the corners, reduce electromagnetic radiation, and also facilitate the processing and manufacturing of the PCB board. It avoids stress concentration problems that may occur at right-angle corners and improves the mechanical strength of the PCB board.

[0043] Furthermore, the multiple power devices include a choke 110, a rectifier bridge 120, a PFC inductor 130, an electrolytic capacitor 140, and an IPM connected in series.

[0044] Specifically, high-power devices are forced to be arranged closely along the outer periphery of an L-shaped path, specifically: choke 110, rectifier bridge 120, PFC inductor 130, electrolytic capacitor 140, fan IPM151, and compressor IPM152 connected in series. See the PCB circuit diagram for details. Figure 4 As shown.

[0045] Furthermore, a quiet zone 103 is provided on the PCB board, and a sensitive control circuit is arranged in the quiet zone 103. The quiet zone 103 is isolated from the outer peripheral path.

[0046] Specifically, the sensitive control circuit is arranged in a quiet zone 103 that is isolated from the L-shaped outer peripheral path, which can effectively reduce the interference of internal switching noise on the sensitive control circuit and improve the stability and reliability of the system. The isolation of the quiet zone 103 from the critical power loop enables the sensitive control circuit to work in a relatively stable electromagnetic environment, avoiding problems such as decreased control accuracy or system failure caused by interference.

[0047] Furthermore, the PCB board also includes a filtering circuit, which includes a filter that is positioned away from multiple power devices.

[0048] Specifically, the PCB board also has a filter circuit, which includes components such as filters. In order to avoid interference from power devices and to prevent secondary coupling of interference, the filters are placed far away from the power devices.

[0049] Furthermore, the parameters of the filter circuit are adjusted according to the EMI curve, and the routing of the filter circuit is adapted to the peripheral path.

[0050] Specifically, the parameters of the filter circuit are adjusted according to the EMI curve, such as adjusting the capacitance and inductance values ​​of the filter, to ensure that the filter circuit can effectively suppress EMI at specific frequencies. The routing of the filter circuit is also adapted to the L-shaped peripheral path to avoid unnecessary coupling between the routing and the power loop, ensuring the maximization of the filtering effect. At the same time, due to the improved EMI suppression effect, the dependence on high-priced filter components is reduced, further reducing the system cost.

[0051] Furthermore, the incoming line 101 is located at the upper right corner of the PCB board, and the outgoing line 102 is located at the lower left corner of the PCB board; or the incoming line 101 is located at the upper left corner of the PCB board, and the outgoing line 102 is located at the lower right corner of the PCB board.

[0052] Specifically, there are several options for the diagonal arrangement of the input terminal 101 and the output terminal 102. For example, the input terminal 101 can be located at the upper right corner of the PCB board and the output terminal 102 can be located at the lower left corner of the PCB board, or the input terminal 101 can be located at the upper left corner of the PCB board and the output terminal 102 can be located at the lower right corner of the PCB board. This flexible arrangement can adapt to different electrical control system layout requirements and improve the applicability of this utility model.

[0053] Specifically, in this embodiment, the incoming line 101 is located at the upper right corner of the PCB board, and the outgoing line 102 is located at the lower left corner of the PCB board.

[0054] Furthermore, the electrical control box 100 is also provided with a wiring compartment, which is used to accommodate the power cord connected to the inlet terminal 101 and the load cord connected to the outlet terminal 102. The power cord and the load cord are arranged separately in the wiring compartment.

[0055] Specifically, in the wiring compartment of the electrical control box 100, the power cord and load cord are arranged separately, reducing the risk of crosstalk between lines.

[0056] Meanwhile, the wiring compartment is also equipped with a shielding structure, which can be a shielding cover or a shielding partition, etc., to effectively shield the power lines and load lines, further reducing the impact of crosstalk between lines and external electromagnetic interference on the cables. In addition, the separate wiring compartment design also facilitates the implementation of independent shielding and grounding strategies, improving the filtering effect. The separate wiring harness arrangement also facilitates later maintenance and repair, reducing maintenance costs.

[0057] Furthermore, the electrical control box 100 also includes an inner shell on which a PCB board is mounted.

[0058] Specifically, the inner shell is designed to house the PCB board, which also improves the overall structural strength of the electrical control box 100.

[0059] Preferably, a partition can also be provided on the inner shell to isolate the quiet zone 103, further enhancing the isolation effect between the quiet zone 103 and the area where the L-shaped outer peripheral path is located. This can effectively block the path of input noise directly injected into the output harness through spatial coupling or line crosstalk, significantly reducing the conduction of common-mode and differential-mode interference. In addition, the partition can also provide some support and protection for the devices on the PCB board, further improving the overall structural strength of the electrical control box 100.

[0060]

Example 2

[0061] See Figure 2 and Figure 3 This embodiment also provides an outdoor air conditioning unit, including: a right side plate 10 and an electrical control box 100 as described in Embodiment 1 above. The right side plate 10 has a wiring window 11, and an electrical bracket 12 is provided at the wiring window 11. A terminal block is installed on the electrical bracket 12. The electrical control box 100 is connected to the terminal block through an inlet terminal 101.

[0062] Specifically, the terminal block (not shown in the attached diagram) is located in the wiring window 11 of the right side plate 10. The inlet terminal 101 of the PCB board is located on the right side of the PCB board. The power cord of the control box 100 is connected to the terminal block. The control box 100 is vertically installed, and the thickness direction of the control box 100 is consistent with the front-to-back direction of the outdoor unit of the air conditioner.

[0063] Furthermore, the outdoor unit of the air conditioner also includes: an outer casing assembly and a windproof panel 20, the outer casing assembly having a receiving cavity; the windproof panel 20 divides the receiving cavity into a first cavity 21 and a second cavity 22, and the first cavity 21 has a compressor 211 and an electrical control box 100, the compressor 211 being located below the electrical control box 100, and the second cavity 22 having a fan.

[0064] Specifically, the outer casing assembly includes a right side plate 10, a left side plate (not shown in the attached drawings), a back plate (not shown in the attached drawings), and a chassis 30. The back plate connects the left side plate and the right side plate 10, and the right side plate 10, the back plate, the left side plate, and the chassis 30 form a receiving cavity. The outer casing assembly is provided with a windproof upright plate 20, which divides the receiving cavity into a first cavity 21 and a second cavity 22. The first cavity 21 is provided with a compressor 211 and an electrical control box 100. The compressor 211 is located below the electrical control box 100. The second cavity 22 is provided with a heat exchanger, which is installed on the chassis 30 and adjacent to the windproof upright plate 20. The heat exchanger is provided with a receiving groove, and a fan is provided in the receiving groove.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not 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 spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electric control box (100), characterized in that, The electrical control box (100) includes: The PCB board has an inlet terminal (101) and an outlet terminal (102), and the inlet terminal (101) and the outlet terminal (102) are respectively located at opposite corners of the PCB board. The PCB board is also provided with a number of power devices arranged in sequence and connected in series along the outer peripheral path from the inlet end (101) to the outlet end (102), and the outer peripheral path is L-shaped.

2. The electrical control box (100) according to claim 1, characterized in that, The plurality of power devices include a choke (110), a rectifier bridge (120), a PFC inductor (130), an electrolytic capacitor (140), and an IPM connected in series.

3. The electrical control box (100) according to any one of claims 1-2, characterized in that, The PCB board is also provided with a quiet zone (103), in which a sensitive control circuit is arranged, and the quiet zone (103) is isolated from the outer peripheral path.

4. The electrical control box (100) according to any one of claims 1-2, characterized in that, The PCB board is also provided with a filtering circuit, which includes a filter and is disposed away from the plurality of power devices.

5. The electrical control box (100) according to claim 4, characterized in that, The parameters of the filter circuit are adjusted according to the EMI curve, and the routing of the filter circuit is adapted to the outer peripheral path.

6. The electrical control box (100) according to any one of claims 1-2, characterized in that, The input terminal (101) is located at the upper right corner of the PCB board, and the output terminal (102) is located at the lower left corner of the PCB board; or The incoming line (101) is located at the upper left corner of the PCB board, and the outgoing line (102) is located at the lower right corner of the PCB board.

7. The electrical control box (100) according to any one of claims 1-2, characterized in that, The electrical control box (100) is also provided with a wiring compartment, which is used to accommodate the power line connected to the inlet terminal (101) and the load line connected to the outlet terminal (102). The power line and the load line are arranged separately in the wiring compartment.

8. The electric control box (100) according to claim 1, characterized in that, The electrical control box (100) also includes: The inner shell has the PCB board mounted on it.

9. An air conditioner outdoor unit characterized by comprising: The outdoor unit of the air conditioner includes: The right side plate (10) has a wiring window (11) and an electrical rack (12) is provided at the wiring window (11). A terminal block is installed on the electrical rack (12). The electrical control box (100) as described in any one of claims 1-8 is connected to the terminal block via the incoming terminal (101).

10. The air conditioner outdoor unit according to claim 9, characterized by The outdoor unit of the air conditioner also includes: A housing assembly having a receiving cavity within it; The windproof upright plate (20) divides the receiving cavity into a first cavity (21) and a second cavity (22). The first cavity (21) is equipped with a compressor (211) and the electrical control box (100). The compressor (211) is located on the lower side of the electrical control box (100). The second cavity (22) is equipped with a fan.

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