Inverter welding structure
By using a clamping structure to hold the solder layer in the inverter with a fixing plate and locking components, the problems of high assembly cost and unstable structure of traditional inverters are solved. This achieves low-cost and stable electrical and mechanical connections and improves the structural strength of the inverter.
Patent Information
- Application Number
- CN202520439046.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-12
AI Technical Summary
In the assembly process of traditional inverters, the mechanical and electrical connections between the power board and the control and drive board are costly, and the structure is prone to instability due to high-temperature welding.
The fixture structure uses two fixing plates and a locking assembly to clamp the power board and control and drive board in the solder layer. The locking assembly is used to lock them in place, ensuring the flatness of the plates during the welding process, avoiding warping, and achieving electrical and mechanical connection.
It reduces component and process costs, ensures a robust inverter structure, reliable performance, and improved structural strength.
Smart Images
Figure CN223819782U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive parts technology, and more specifically, to the welding structure of inverters. Background Technology
[0002] An inverter is used to convert direct current to alternating current. Its main functional modules include a power board and a control and drive board.
[0003] In inverter assembly, the traditional approach is to achieve mechanical connection between the power board and the control and drive board through a frame board, and electrical connection between the power board and the control and drive board through interfaces such as connectors. This approach has high process and component costs.
[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content
[0005] This invention provides an inverter welding structure that enables electrical and mechanical connections between the power board and the control and drive board in a low-cost manner, and ensures that the inverter structure is stable and its performance is reliable after assembly.
[0006] According to one aspect of the present invention, an inverter welding structure is provided, comprising: a power board, a control and drive board stacked on the power board, and a solder layer sandwiched between the power board and the control and drive board; a clamp comprising two fixing plates that respectively press against the power board and the control and drive board, and a locking assembly for locking the two fixing plates.
[0007] In some embodiments, the locking assembly includes: a bushing, the edge of the fixing plate extending beyond the edges of the power plate and the control and drive plate, the bushing being supported between the edges of the two fixing plates; and a fastener passing through and locking the edges of the two fixing plates.
[0008] In some embodiments, the bushing is positioned close to and spaced apart from the fastener.
[0009] In some embodiments, the bushings include a plurality of bushings distributed around the periphery of the fastener; or, the bushings are annular bushings through which the fastener passes.
[0010] In some embodiments, the bushing and the fastener comprise multiple sets, circumferentially spaced around the power board and the control and drive board; or, the bushing comprises an outer ring bushing and an inner ring bushing surrounding the power board and the control and drive board, and the fastener is disposed between the outer ring bushing and the inner ring bushing.
[0011] In some embodiments, the fastener is a bolt and nut assembly, and / or the bushing is a steel bushing.
[0012] In some embodiments, the solder layer consists of preformed solder sheets or solder paste, wherein the void ratio of the preformed solder sheets and the solder paste is less than 5%.
[0013] In some embodiments, the power board and the control and drive board are respectively provided with pads on their surfaces, and the solder layer connects the pads of the power board and the control and drive board; the other areas of the surfaces of the power board and the control and drive board, excluding the pads, are covered with a protective coating.
[0014] The beneficial effects of this utility model compared with the prior art include at least the following:
[0015] This invention sandwiches a solder layer between the control and drive board and the power board. After welding, the solder layer enables electrical and mechanical connections between the control and drive board and the power board, eliminating the need for frame boards, connectors, and other structures, thus significantly reducing component and manufacturing costs. Considering the high-temperature characteristics of the welding process, this invention features a fixture that uses two fixing plates to maintain the flatness of the power board and the control and drive board, and a locking assembly to secure them together, preventing loosening. This avoids warping of the power board / control and drive board due to the high temperatures of the welding process, resulting in a stable and reliable inverter structure. Furthermore, by welding the power board and control and drive board together, this invention integrates the two circuit boards into a single unit, improving the structural strength of the inverter.
[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description
[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.
[0018] Figure 1 This diagram shows a schematic of the inverter welding structure in an embodiment of the present invention.
[0019] Figure 2 This diagram shows the structure of the inverter in an embodiment of the present invention.
[0020] Figure 3This diagram shows a schematic representation of the power board in an embodiment of the present invention.
[0021] Figure 4 A schematic diagram of the steel mesh template in an embodiment of this utility model is shown. Detailed Implementation
[0022] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to those described herein. Rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.
[0023] The accompanying drawings are merely illustrative of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore, repeated descriptions of them will be omitted.
[0024] The terms "upper," "lower," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium.
[0025] It should be noted that, unless otherwise specified, the embodiments of this utility model and the features in different embodiments can be combined with each other.
[0026] Figure 1 The inverter welding structure is shown in the diagram. Figure 1 As shown, the inverter welding structure provided in this embodiment of the present invention includes:
[0027] Power board 10, control and drive board 20 stacked on power board 10, solder layer 30 sandwiched between power board 10 and control and drive board 20;
[0028] The fixture includes two fixing plates 41 that respectively press against the power board 10 and the control and drive board 20, and a locking assembly 42 that locks the two fixing plates 41.
[0029] This invention sandwiches a solder layer 30 between the control and drive board 20 and the power board 10. After welding, the solder layer 30 enables both electrical and mechanical connections between the control and drive board 20 and the power board 10, eliminating the need for frame boards, connectors, and other structures, thus significantly reducing component and process costs. Considering the high-temperature characteristics of the welding process, this invention employs a fixture. Two fixing plates 41 maintain the flatness of the power board 10 and the control and drive board 20, while a locking assembly 42 secures them together to prevent loosening. This prevents warping of the power board 10 / control and drive board 20 due to the high temperatures of the welding process, resulting in a stable and reliable inverter structure. This invention welds the power board 10 and the control and drive board 20 together, integrating the two circuit boards into a single unit, thereby improving the structural strength of the inverter.
[0030] After welding is completed, the fixture is removed, and the resulting inverter structure is as follows: Figure 2 As shown, the power board 10 and the control and drive board 20 are electrically and mechanically connected through soldering of the solder layer 30. Among these, Figure 2 The diagram shows the half-bridge module of the inverter.
[0031] The power board 10 and the control and driver board 20 are key components of the inverter, respectively undertaking the important functions of power conversion and control and drive. The power board 10 is used to convert DC power to AC power, and the control and driver board 20 is used to generate control signals to drive the power devices of the power board 10. Through the coordinated work of the power board 10 and the control and driver board 20, the inverter achieves efficient and stable operation.
[0032] The solder layer 30 welds the control and drive board 200 and the power board 100 together to achieve mechanical connection. It can also transmit control signals, feedback signals, drive signals, power signals and other signals required to ensure stable operation of the inverter between the control and drive board 200 and the power board 100, and achieve electrical connection between the power board 100 and the control and drive board 200.
[0033] Continue to refer to Figure 1As shown, in some embodiments, the locking assembly 42 includes: a bushing 421, the edge of the fixing plate 41 extending beyond the edges of the power board 10 and the control and drive board 20, the bushing 421 being supported between the edges of the two fixing plates 41; and a fastener 422, passing through and locking the edges of the two fixing plates 41. The bushing 421 supporting the edges of the two fixing plates 41 maintains a reasonable distance between them, allowing the two fixing plates 41 to apply appropriate pressure to the power board 10 and the control and drive board 20, preventing damage. The fastener 422 passing through and locking the edges of the two fixing plates 41 ensures stability of the power board 10, the solder layer 30, and the control and drive board 20 during soldering, ensuring that the solder layer 30 solders the pads 11 of the power board 10 to the pads 21 of the control and drive board 20 together.
[0034] In some embodiments, the bushing 421 is disposed close to and spaced apart from the fastener 422. This prevents pressure concentration at the point of force application on the fastener 422, thus avoiding warping of the fixing plate 41, and also provides a reasonable gap of several millimeters between the bushing 421 and the fastener 422 to prevent interference. Multiple bushings 421 are distributed around the periphery of the fastener 422; specifically, the bushings 421 can be formed in the shape of columns or strips, providing stable support for the fastener 422. Alternatively, the bushing 421 can be an annular bushing through which the fastener 422 passes; this provides uniform and stable support for the fastener 422.
[0035] In some embodiments, bushings 421 and fasteners 422 comprise multiple sets, circumferentially spaced around the power board 10 and the control and drive board 20; thus, stable support and locking of the power board 10 and the control and drive board 20 are achieved, preventing warping. In this embodiment, bushings 421 may be formed in the above-described strip or ring shape.
[0036] In some embodiments, bushing 421 includes an outer ring bushing and an inner ring bushing surrounding the power board 10 and the control and drive board 20, and fastener 422 is disposed between the outer ring bushing and the inner ring bushing. This provides uniform and stable support and locking for the power board 10 and the control and drive board 20, effectively preventing board warping.
[0037] In some embodiments, the fastener 422 may be a bolt and nut assembly for easy locking and loosening. In some embodiments, fasteners such as pins may also be used to lock the two fixing plates 41. The bushing 421 may be a steel bushing 421, which has high strength and high stability.
[0038] In some embodiments, the solder layer 30 is composed of pre-formed solder sheets or solder paste, wherein the void ratio of the pre-formed solder sheets and solder paste is less than 5%.
[0039] Preformed solder pads are solid solder pieces pre-formed into specific shapes (e.g., round, square), typically composed of alloys such as tin, silver, and copper. Preformed solder pads offer advantages such as precise solder quantity control, high production efficiency, and good soldering consistency. Solder paste is a paste-like material composed of solder powder, flux, etc., usually applied to solder pads by printing or dotting, and is widely used in the reflow soldering process of SMT (Surface Mount Technology). Void ratio refers to the volume proportion of voids (bubbles) in the solder layer; a lower void ratio indicates higher soldering quality.
[0040] In some embodiments, the surfaces of the power board 10 and the control and drive board 20 are respectively provided with pads, and the solder layer 30 connects the pads 11 of the power board 10 and the pads 21 of the control and drive board 20.
[0041] Combination Figure 1 and Figure 2 As shown, the pads 11 of the power board 10 are connected to the electronic components 13 of the power board 10 via leads 12, and the pads 21 of the control and drive board 20 are connected to the electronic components of the control and drive board 20 via leads 22 (not specifically shown in the figure). A solder layer 30 solders the pads 11 of the power board 10 to the pads 21 of the control and drive board 20, achieving electrical and mechanical connections between the power board 10 and the control and drive board 20. The surfaces of the pads 11 and 21 are treated with ENIG (electrochemical nickel immersion gold), which protects the pads from oxidation and provides good contact performance. The surfaces of the power board 10 and the control and drive board 20, excluding the pads, are insulated with a protective coating to prevent solder from adhering to non-soldering areas during the soldering process, thereby avoiding short circuits and electrical faults.
[0042] In the above embodiments, the power board 10 and the control and drive board 20 can be formed as a chip-embedded PCB. A chip-embedded PCB refers to a PCB in which electronic components are embedded inside, thereby improving the integration, performance, and reliability of the power board 10 and the control and drive board 20.
[0043] The following describes the process of assembling the inverter, based on the inverter welding structure described in any of the above embodiments.
[0044] A solder layer 30 is provided on the power board 10. Specifically, Figure 3 The structure of the power board is shown. Figure 4 The structure of the steel mesh formwork is illustrated; combined with Figures 1 to 4As shown, a solder layer 30 is formed on the power board 10, including: applying solder to the pads 11 of the power board 10 through stencil printing using a surface mount technology (SMT) process, forming the solder layer 30. Based on the inverter's design requirements, the distribution of the pads 11 on the power board 10 can be adjusted as needed. The stencil template 60 is used to achieve precise solder coating for subsequent mounting of the pads 21 of the control and drive board 20 and reflow soldering. The stencil template 60 has through holes 61 corresponding to the positions of the pads 11. When coating the solder, the stencil template 60 is first fixed on the printing press to ensure that the through holes 61 are aligned with the pads 11; then, solder (e.g., solder paste) is evenly applied into the through holes 61 of the stencil template 60, and excess solder is scraped off with a scraper; finally, the stencil template 60 is removed, leaving the solder layer 30 coated on the power pads 11.
[0045] A control and drive board 20 is stacked on the power board 10, with a solder layer 30 sandwiched between the power board 10 and the control and drive board 20 to form an intermediate structure of the inverter. The surface of the control and drive board 20 has pads 21 corresponding to the positions of the pads 11. When stacking the control and drive board 20, the pads 21 of the control and drive board 20 are aligned with the solder layer 30, so that the pads 21 press against the solder layer 30, thereby sandwiching the solder layer 30 between the pads 11 of the power board 10 and the pads 21 of the control and drive board 20.
[0046] The intermediate structure of the inverter is placed between the two fixing plates 41 of the fixture, so that the two fixing plates 41 press against the power plate 10 and the control and drive plate 20 respectively, and the two fixing plates 41 are locked by the locking assembly 42 of the fixture to form a... Figure 1 The inverter welding structure is shown. In practice, before applying the solder layer 30 to the power board 10, the power board 10 can be placed on a fixing plate 41. After stacking the control and drive board 20 on the power board 10, another fixing plate is pressed onto the control and drive board 20. The locking tightness of the locking assembly 42 can be adjusted as needed to regulate the pressing force of the two fixing plates 41 on the intermediate structure of the inverter, ensuring smooth subsequent welding. For example, the pressing force applied by the clamp to the intermediate structure of the inverter can be controlled between 10 MPa and 20 MPa.
[0047] Reflow soldering is performed on the inverter's soldered structure. Reflow soldering melts and solidifies the solder through heating, forming reliable electrical and mechanical connections. In practice, the inverter's soldered structure can be placed in a reflow oven for soldering. Reflow soldering involves high temperatures (typically between 230°C and 250°C), which can easily cause circuit board warping. This invention uses a clamp and a fixing plate 41 to maintain the flatness of the power board 10 and the control and drive board 20, and a locking assembly 42 to lock them in place to prevent loosening. This avoids warping of the power board 10 / control and drive board 20 due to the high temperatures during the soldering process, resulting in a stable and reliable inverter structure.
[0048] After welding is completed, the fixture is removed, and the resulting inverter structure is as follows: Figure 2 As shown, the electrical and mechanical connections between the power board 10 and the control and drive board 20 are achieved through the solder layer 30, eliminating the need for frame boards, connectors, and other structures, thus greatly saving component and manufacturing costs. Furthermore, by soldering the power board 10 and the control and drive board 20 together, this invention integrates the two circuit boards into a single unit, improving the structural strength of the inverter.
[0049] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.
Claims
1. An inverter welding structure, characterized in that, include: A power board, a control and drive board stacked on the power board, and a solder layer sandwiched between the power board and the control and drive board; The fixture includes two fixing plates that respectively press against the power board and the control and drive board, and a locking assembly for locking the two fixing plates.
2. The inverter welding structure as described in claim 1, characterized in that, The locking assembly includes: The bushing has an edge extending beyond the edges of the power board and the control and drive board, and is supported between the edges of the two fixed plates. Fasteners pass through and lock the edges of the two fixing plates.
3. The inverter welding structure as described in claim 2, characterized in that, The bushing is positioned close to the fastener and spaced apart from the fastener.
4. The inverter welding structure as described in claim 3, characterized in that, The bushings include multiple bushings distributed around the periphery of the fastener; Alternatively, the bushing may be an annular bushing through which the fastener passes.
5. The inverter welding structure as described in claim 2, characterized in that, The bushing and the fasteners comprise multiple sets, which are circumferentially spaced around the power board and the control and drive board. Alternatively, the bushing may include an outer ring bushing and an inner ring bushing surrounding the power board and the control and drive board, with the fastener disposed between the outer ring bushing and the inner ring bushing.
6. The inverter welding structure as described in claim 2, characterized in that, The fastener is a bolt and nut assembly, and / or the bushing is a steel bushing.
7. The inverter welding structure as described in claim 1, characterized in that, The solder layer is composed of preformed solder sheets or solder paste, and the void ratio of the preformed solder sheets and the solder paste is less than 5%.
8. The inverter welding structure as described in claim 1, characterized in that, The power board and the control and drive board are respectively provided with pads, and the solder layer connects the pads of the power board and the control and drive board. The surfaces of the power board and the control and drive board, excluding the solder pads, are covered with a protective coating.