Non-insulated three-phase bridge

Abstract

The utility model belongs to the technical field of three-phase bridges, and particularly relates to a non-insulating three-phase bridge, which comprises a conductive bottom plate, an insulating shell, four external terminals, three bridge structures, a second spacer and three second jumpers. The non-insulation type design is adopted, the conductive bottom plate can directly serve as a negative electrode to be connected with the vehicle shell, no additional wire harness is needed for connecting the negative electrode and the vehicle shell, the installation and maintenance process is greatly simplified, the assembly complexity and the connecting point fault risk are reduced, the heat dissipation effect is good, the conductive bottom plate, the molybdenum sheet and other components have good heat dissipation performance, and the service life is prolonged. Heat generated when the chip works can be dissipated in time, the performance stability is effectively improved, the service life is effectively prolonged, and the fault risk caused by overheating is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of three-phase bridge technology, specifically relating to a non-insulated three-phase bridge. Background Technology

[0002] In automotive circuit design, a single-wire design is currently widely used. Specifically, the three-phase bridge in the automotive circuit is responsible for converting the alternating current (AC) output from the generator into direct current (DC). After completing the AC-DC conversion, the positive terminal of the DC output from the three-phase bridge is connected to the positive terminal of each electrical device through a wiring harness, while the negative terminal of the electrical device is directly connected to the vehicle body. At the same time, the vehicle body is connected to the negative terminal of the three-phase bridge, thus forming a complete closed loop.

[0003] The above design makes the vehicle body a common negative circuit for all electrical appliances, which can significantly reduce the use of negative wiring harnesses, effectively reduce the length of the wiring harnesses and the overall complexity, thereby reducing production costs and the failure rate caused by wiring harness problems.

[0004] Current three-phase bridges generally adopt a fully insulated encapsulation process, which means that the rectifier circuit is sealed in an insulating box and externally connected only through three AC terminals and two DC terminals.

[0005] However, when the above-mentioned insulated three-phase bridge design is applied to automotive circuits, a dedicated wiring harness must be set up to connect the DC negative terminal of the three-phase bridge to the vehicle body, which increases the assembly complexity and the risk of connection point failure. In addition, the low thermal conductivity of the insulating box restricts the heat dissipation efficiency of the three-phase bridge, which can easily cause the components to overheat under continuous high load conditions, directly affecting the working stability and service life. Utility Model Content

[0006] The purpose of this invention is to provide a non-insulated three-phase bridge, which solves the technical problems of high assembly complexity, high risk of connection point failure, and poor heat dissipation of the existing insulated three-phase bridge.

[0007] This utility model discloses a non-insulated three-phase bridge, comprising:

[0008] Conductive base plate;

[0009] An insulating outer casing is installed on the top surface of the conductive base plate;

[0010] Four external terminals are arranged side-by-side at intervals on the top surface of the insulating housing, including one DC output terminal and three AC input terminals;

[0011] Three bridge structures are disposed within the insulating housing and are located below the AC input terminals, one for each bridge structure.

[0012] A first molybdenum sheet is disposed on the top surface of the conductive base plate.

[0013] The first chip, with its anode side facing upwards, is located on the top surface of the first molybdenum sheet.

[0014] The second molybdenum plate is disposed on the top surface of the first chip and connected to the corresponding AC input terminal.

[0015] The first spacer is located beside the first chip and is disposed on the top surface of the conductive substrate.

[0016] The first skip plate has its left end located on the top surface of the first spacer and its right end located on the top surface of the second molybdenum sheet.

[0017] The third molybdenum sheet is located on the top surface of the left end of the first skip plate.

[0018] The second chip, with its anode side facing downwards, is located on the top surface of the third molybdenum sheet.

[0019] The fourth molybdenum sheet is disposed on the top surface of the second chip;

[0020] The second spacer is disposed on the top surface of the conductive base plate and located below the DC output terminal, and its top surface is connected to the DC output terminal;

[0021] Three second-stage plates are sequentially overlapped between the top surfaces of the second spacer and the three fourth-stage molybdenum plates.

[0022] This application adopts a non-insulated design, and the conductive base plate can be directly connected to the car body as the negative electrode without the need for an additional wiring harness to connect the negative electrode to the car body. This greatly simplifies the installation and maintenance process, reduces assembly complexity and connection point failure risk, and provides good heat dissipation. The conductive base plate and molybdenum sheet and other components have good heat dissipation performance, which can dissipate the heat generated by the chip during operation in a timely manner, effectively improving performance stability and service life, and reducing the risk of failure due to overheating.

[0023] Based on the above technical solution, the solution of this application can be further improved as follows:

[0024] Preferably, the external terminal includes:

[0025] A fixing nut is embedded in the top surface of the insulating outer shell;

[0026] A locking bolt, threadedly connected to the locking bolt;

[0027] A support washer is fitted over the locking bolt;

[0028] The connecting lead is fitted onto the locking bolt at one end and positioned between the support washer and the fixing nut, while the other end passes through the insulating shell. This design offers advantages such as a stable connection, good conductivity, and durability, ensuring reliable connection and stable operation with external circuits.

[0029] Preferably, the top surface of the insulating shell has a receiving groove adapted to the fixing nut, and a strip-shaped through hole for the connecting lead to pass through. This solution allows the fixing nut to be accurately embedded, thereby enhancing its installation stability, providing positioning and protection to prevent displacement or damage from external forces, enabling the connecting lead to pass through to meet circuit connection requirements, and ensuring the sealing of the insulating shell, thus improving the protection effect.

[0030] Preferably, the insulating shell has flat areas on both sides, and the top surface of the flat areas has accommodating through holes. The conductive base plate has mounting through holes on both sides, and the accommodating through holes and the mounting through holes correspond to each other. This solution reduces the thickness of the insulating shell on both sides, facilitates the installation of connectors, achieves a stable connection, ensures the stability and reliability of the overall structure, and allows the conductive base plate to be directly installed on the vehicle body by bolts. It is easy to install and remove, quick to operate, and the connection is stable, ensuring the performance of the product.

[0031] Preferably, the flat area is detachably connected to the conductive base plate via connecting bolts. This solution facilitates convenient and efficient installation and disassembly, aids in daily assembly and maintenance, improves maintainability, facilitates component replacement and troubleshooting, ensures reliable connection, maintains structural stability, and reduces maintenance and production costs.

[0032] Preferably, the connecting leads included in the AC input terminal and the DC output terminal are symmetrically arranged about the central axis of the conductive base plate when projected along the length direction of the conductive base plate. This solution enables operators to quickly and accurately identify and locate each terminal, reducing installation difficulty and error probability. At the same time, it can also more efficiently find the problem area during subsequent maintenance and repair, improving maintenance efficiency.

[0033] Through the above technical solution, this utility model achieves the following beneficial effects:

[0034] 1. This application adopts a non-insulated design, and the conductive base plate can be directly connected to the car body as the negative electrode without the need for an additional wiring harness to connect the negative electrode to the car body, which greatly simplifies the installation and maintenance process and reduces the assembly complexity and connection point failure risk;

[0035] 2. The conductive substrate and molybdenum sheet of this application have good heat dissipation performance, which can dissipate the heat generated by the chip during operation in a timely manner, effectively improving performance stability and service life, and reducing the risk of failure due to overheating. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a perspective view of the non-insulated three-phase bridge described in a specific embodiment of the present invention;

[0038] Figure 2 for Figure 1 The diagram shows the structure of the insulating shell in a non-insulated three-phase bridge.

[0039] Figure 3 for Figure 1 The diagram shows the internal structure of a non-insulated three-phase bridge.

[0040] Figure 4 for Figure 1 The front view of the non-insulated three-phase bridge is shown below.

[0041] Figure 5 for Figure 4 Schematic diagram of the cross section at point AA;

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Conductive base plate; 2. Insulating shell; 3. External terminal; 4. Bridge structure; 5. Second partition; 6. Second jumper; 7. Connecting bolts;

[0044] 11. Mounting through hole; 201. Receiving groove; 202. Strip-shaped through hole; 21. Flat area; 211. Receiving through hole; 3a. DC output terminal; 3b. AC input terminal; 31. Fixing nut; 32. Locking bolt; 33. Support washer; 34. Connecting lead; 41. First molybdenum sheet; 42. First chip; 43. Second molybdenum sheet; 44. First spacer; 45. First jumper; 46. Third molybdenum sheet; 47. Second chip; 48. Fourth molybdenum sheet. Detailed Implementation

[0045] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0046] First, it should be noted that some directional terms used in the following description to clearly illustrate the technical solution of this utility model, such as the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are all derived from the normal orientation of components in a non-insulated three-phase bridge. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0050] Example:

[0051] like Figure 1 As shown in the figure, this application discloses a non-insulated three-phase bridge for converting AC power to DC power. When applied in automotive circuits, it eliminates the need for a dedicated wiring harness to connect the DC negative terminal to the vehicle body, thereby reducing assembly complexity and the risk of connection point failure. It also has the advantage of good heat dissipation. Its specific structure includes: a conductive base plate 1, an insulating shell 2, four external terminals 3, three bridge structures 4, a second spacer 5, and three second jumpers 6.

[0052] The conductive base plate 1, as a basic support component, is made of materials with good conductivity such as copper alloy. It directly connects to the car body as the negative electrode in the circuit, thus eliminating the need for additional wiring harnesses to connect the negative electrode of the three-phase bridge to the car body. This greatly simplifies the installation and maintenance process. In addition, its excellent thermal conductivity helps to quickly conduct the heat generated by components such as chips away, thus playing a role in heat dissipation.

[0053] For example, the conductive base plate 1 can be provided with multiple fixing through holes, so that the conductive base plate 1 can be directly installed and fixed using bolts. Its structure is simple, the connection is firm, and it is easy to assemble and disassemble.

[0054] The insulating outer shell 2 is installed on the top surface of the conductive base plate 1. It mainly serves to insulate and protect the internal circuit components, which can prevent short circuits and other faults, protect the internal components from corrosion and damage, and extend their service life.

[0055] Four external terminals 3 are arranged side by side at intervals on the top surface of the insulating housing 2, including one DC output terminal 3a and three AC input terminals 3b; wherein, the DC output terminal 3a is used to output the converted DC power, and the AC input terminal 3b is used to connect the AC power output by the generator.

[0056] Three bridge structures 4 are housed inside the insulating housing 2 and are located below the AC input terminal 3b in a corresponding manner. They are the core components for realizing AC-DC conversion and are composed of multiple elements.

[0057] Specifically, each bridge structure 4 includes:

[0058] The first molybdenum sheet 41 is disposed on the top surface of the conductive base plate 1;

[0059] The first chip 42 is disposed with its anode side facing upwards on the top surface of the first molybdenum sheet 41;

[0060] The second molybdenum sheet 43 is disposed on the top surface of the first chip 42 and connected to the corresponding AC input terminal 3b;

[0061] The first partition 44 is located next to the first chip 42 and is disposed on the top surface of the conductive base plate 1, serving as an electrical isolation and support function.

[0062] The first jumper 45 has its left end located on the top surface of the first partition 44 and its right end located on the top surface of the second molybdenum sheet 43, and is used to realize the conduction and connection of the circuit.

[0063] The third molybdenum sheet 46 is located on the top surface of the left end of the first jumper 45;

[0064] The second chip 47 is positioned with its anode side facing downwards and is located on the top surface of the third molybdenum sheet 46;

[0065] The fourth molybdenum sheet 48 is located on the top surface of the second chip 47.

[0066] It should be noted that the first chip 42 and the second chip 47 are key components for realizing AC-DC conversion. They have unidirectional conductivity, allowing current to flow only from the anode to the cathode, thereby realizing the AC-DC conversion function.

[0067] It should be noted that molybdenum sheets have a high melting point, high electrical conductivity, and good thermal conductivity, which enables them to maintain stable performance in high-temperature environments. This allows them to effectively conduct electricity and dissipate heat, achieving efficient and stable current conduction and helping to dissipate the heat generated by the chip.

[0068] The second partition 5 is located on the top surface of the conductive base plate 1 and below the DC output terminal 3a. Its top surface is connected to the DC output terminal 3a, which serves as electrical isolation and support. It is used to isolate the DC output terminal 3a from the conductive base plate 1 to prevent short circuits and other faults. At the same time, it provides support for the second jumper 6 to ensure a stable circuit connection.

[0069] The three second jumpers 6 are sequentially connected between the top surfaces of the second spacer 5 and the three fourth molybdenum plates 48, which serve to conduct and converge the current, and are used to converge the DC power output from the three bridge structures 4 to the DC output terminal 3a; and the connection method has the advantages of simplicity and reliability, ensuring smooth current transmission.

[0070] For example, both the first spacer 44 and the second spacer 5 are DBC boards (direct copper-clad ceramic substrates), which have a "copper-ceramic-copper" sandwich structure, combining the insulating properties of ceramics with the high conductivity and high thermal conductivity of copper, and can effectively prevent short circuits between the positive and negative electrodes.

[0071] Specifically, solder pads are provided between any two adjacent layers, which reduces contact resistance, enhances conductivity, and ensures smooth current transmission and uniform distribution. The soldering also fixes the component position, thereby improving structural strength and ensuring mechanical stability. Furthermore, it improves the heat conduction path, reduces thermal resistance, and enhances heat dissipation. At the same time, it isolates air, resists chemical corrosion, prevents component oxidation damage, and extends service life.

[0072] This utility model adopts a non-insulated design, and the conductive base plate 1 can be directly connected to the car body as the negative electrode without the need for an additional wiring harness to connect the negative electrode to the car body. This greatly simplifies the installation and maintenance process, reduces assembly complexity and connection point failure risk, and has good heat dissipation effect. The conductive base plate 1 and molybdenum sheet and other components have good heat dissipation performance, which can dissipate the heat generated by the chip during operation in a timely manner, effectively improving performance stability and service life, and reducing the risk of failure due to overheating.

[0073] In some embodiments, such as Figure 3 As shown, external terminal 3 includes:

[0074] A fixing nut 31 is embedded in the top surface of the insulating housing 2 to provide stable support for the bolt, so that the entire external terminal 3 can be firmly installed on the insulating housing 2;

[0075] Locking bolt 32, which is threadedly connected to locking bolt 32;

[0076] The support pad 33 is sleeved outside the locking bolt 32 to reduce contact resistance and improve current transmission efficiency.

[0077] The connecting lead 34 is fitted onto the locking bolt 32 at one end and is located between the support washer 33 and the fixing nut 31. The other end is inserted into the insulating shell 2. It is made of thin metal sheet and is flat at both ends to increase the contact area and enhance conductivity. It can be bent and adjusted in the middle to avoid short circuit.

[0078] The design of the external terminal 3 described above has the advantages of stable connection, good conductivity and stable durability, ensuring reliable connection and stable operation with external circuits.

[0079] Based on the above embodiments, such as Figure 2 As shown, the top surface of the insulating housing 2 has a receiving groove 201 that is adapted to the fixing nut 31, and a strip-shaped through hole 202 for the connecting lead 34 to pass through.

[0080] By setting the receiving groove 201, the fixing nut 31 can be accurately embedded, thereby enhancing its installation stability and playing a positioning and protection role, preventing displacement or damage from external forces; by opening the strip-shaped through hole 202, the connecting lead 34 can be inserted into the interior to meet the circuit connection requirements, while ensuring the sealing of the interior of the insulating shell 2, thus improving the protection effect.

[0081] In some embodiments, such as Figure 1 As shown, the insulating shell 2 has flat regions 21 on both sides, and a receiving through hole 211 is provided on the top surface of the flat region 21. The conductive base plate 1 has mounting through holes 11 on both sides, and the receiving through hole 211 and the mounting through hole 11 correspond to each other.

[0082] By setting the flat area 21, the thickness of the two sides of the insulating shell 2 is reduced, which facilitates the installation of the connectors and enables a stable connection between the insulating shell 2 and the conductive base plate 1, ensuring the stability and reliability of the overall structure. Furthermore, by setting the accommodating through hole 211 and the mounting through hole 11, the conductive base plate 1 can be directly installed on the vehicle body with bolts. It is easy to install and remove, quick to operate, and the connection is stable, ensuring the performance of the product.

[0083] Based on the above embodiments, such as Figure 1 As shown, the flat area 21 is detachably connected to the conductive base plate 1 by connecting bolts 7.

[0084] For example, there are two connecting bolts 7, which are arranged on both sides of the receiving through hole 211, which reduces stress concentration and improves connection stability.

[0085] The above design is easy and efficient to install and disassemble, which facilitates daily assembly and maintenance, improves maintainability, facilitates component replacement and troubleshooting, ensures reliable connection, maintains structural stability, and reduces maintenance and production costs.

[0086] In this embodiment, as Figure 3 As shown, the connecting leads 34 included in the AC input terminal 3b and the DC output terminal 3a are symmetrically arranged about the central axis of the conductive base plate 1 when projected along the length direction of the conductive base plate 1.

[0087] The above settings enable operators to quickly and accurately identify and locate each terminal, thereby reducing installation difficulty and the probability of errors. At the same time, during subsequent maintenance and repair, it also allows for more efficient location of the problem area and improves maintenance efficiency.

[0088] In some embodiments, such as Figure 5 As shown, the bottom surface of the insulating shell 2 is provided with a limiting groove that is compatible with the conductive base plate 1. It can provide precise positioning for the conductive base plate 1, thereby greatly improving the assembly efficiency and accuracy. At the same time, it can effectively limit the displacement of the conductive base plate 1, enhance the connection stability between the two, and improve the structural stability.

[0089] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0091] 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 the 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 or all 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 they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A non-insulated three-phase bridge, characterized in that, include: Conductive base plate; An insulating outer casing is installed on the top surface of the conductive base plate; Four external terminals are arranged side-by-side at intervals on the top surface of the insulating housing, including one DC output terminal and three AC input terminals; Three bridge structures are disposed within the insulating housing and are located below the AC input terminals, one for each bridge structure. A first molybdenum sheet is disposed on the top surface of the conductive base plate. The first chip, with its anode side facing upwards, is located on the top surface of the first molybdenum sheet. The second molybdenum plate is disposed on the top surface of the first chip and connected to the corresponding AC input terminal. The first spacer is located beside the first chip and is disposed on the top surface of the conductive substrate. The first skip plate has its left end located on the top surface of the first spacer and its right end located on the top surface of the second molybdenum sheet. The third molybdenum sheet is located on the top surface of the left end of the first skip plate. The second chip, with its anode side facing downwards, is located on the top surface of the third molybdenum sheet. The fourth molybdenum sheet is disposed on the top surface of the second chip; The second spacer is disposed on the top surface of the conductive base plate and located below the DC output terminal, and its top surface is connected to the DC output terminal; Three second-stage plates are sequentially overlapped between the top surfaces of the second spacer and the three fourth-stage molybdenum plates.

2. The non-insulated three-phase bridge according to claim 1, characterized in that, The external terminals include: A fixing nut is embedded in the top surface of the insulating outer shell; A locking bolt, threadedly connected to the locking bolt; A support washer is fitted over the locking bolt; The connecting lead is fitted onto the locking bolt at one end and positioned between the support washer and the fixing nut, while the other end passes through the insulating shell.

3. The non-insulated three-phase bridge according to claim 2, characterized in that, The top surface of the insulating shell has a receiving groove adapted to the fixing nut, and a strip-shaped through hole for the connecting lead to pass through.

4. The non-insulated three-phase bridge according to claim 1, characterized in that, The insulating outer shell has flat areas on both sides, and the top surface of the flat areas is provided with receiving through holes. The conductive base plate has mounting through holes on both sides, and the receiving through holes and the mounting through holes correspond to each other.

5. The non-insulated three-phase bridge according to claim 4, characterized in that, The flat area is detachably connected to the conductive base plate via connecting bolts.

6. The non-insulated three-phase bridge according to claim 2, characterized in that, The connecting leads included in the AC input terminal and the DC output terminal are symmetrically arranged about the central axis of the conductive base plate when projected along the length direction of the conductive base plate.

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