A multi-core multilayer ceramic capacitor model design method and system

Abstract

The present invention discloses a multi-core multilayer ceramic capacitor model design method and system, which constructs a first model, which is a geometric model of the capacitor model to be designed; adjusts the material property parameters and size parameters of the first model to obtain a second model; solves the finite element model of the second model based on the mechanical environment corresponding to the capacitor model to be designed to obtain the stress distribution of the lead and the ceramic body contact surface; obtains the corresponding lead pins based on the stress distribution of the lead and the ceramic body contact surface to obtain the capacitor model to be designed; the beneficial effect of the present invention is that by combining the designed ceramic capacitor model with the corresponding mechanical environment and continuously iteratively updating the corresponding design parameters, the relevant lead pins are designed, which can shorten the design cycle of the ceramic capacitor model and improve the efficiency of ceramic capacitor design.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic capacitor model construction, and in particular to a multi-core multilayer ceramic capacitor model design method and system. Background Art

[0002] Multi-core ceramic capacitors are a product developed based on MLCCs. They are designated by the US military as Switch Mode Power Supply Capacitors (SMPS capacitors). These capacitors are assembled by welding multiple multi-layer ceramic capacitors (MLCCs) in parallel, and then connected via metal brackets to form multi-core bracket capacitors. They are widely used in power supply filtering, DC / DC converters, switching circuits for energy input and output, discharge circuits (large capacity), high-temperature filtering, or decoupling. However, when designing ceramic capacitor models using existing technologies, the complex product structure, related material properties, and matching results in a long design cycle and low design efficiency.

[0003] In view of this, this application is hereby filed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that in the existing technology, the design cycle of the ceramic capacitor model is long and the design efficiency is low. The purpose is to provide a multi-core multilayer ceramic capacitor model design method and system, which can shorten the design cycle of the ceramic capacitor model and improve the efficiency of the ceramic capacitor design.

[0005] The present invention is achieved through the following technical solutions:

[0006] A multi-core multilayer ceramic capacitor model design method, the method steps comprising:

[0007] Constructing a first model, wherein the first model is a geometric model of a capacitor model to be designed;

[0008] Adjusting material property parameters and size parameters of the first model to obtain a second model;

[0009] Solving a finite element model of the second model based on the mechanical environment corresponding to the capacitor model to be designed to obtain stress distribution on the contact surface of the lead and the ceramic body;

[0010] Based on the stress distribution of the lead and the contact surface of the ceramic body, the corresponding lead pins are obtained to obtain a capacitor model to be designed.

[0011] Traditionally, in the process of designing a ceramic capacitor model, the ceramic capacitor has a complex structure, and the design must not only consider the overall result but also the relevant material properties, matching, lead structure, etc., resulting in a long design cycle and low design efficiency. The present invention provides a multi-core multilayer ceramic capacitor model design method. By combining the designed ceramic capacitor model with the corresponding mechanical environment and continuously iteratively updating the corresponding design parameters, the relevant lead pins are designed, which can shorten the design cycle of the ceramic capacitor model and improve the efficiency of the ceramic capacitor design.

[0012] Preferably, the sub-step of constructing the first model includes:

[0013] Obtaining a first parameter, where the first parameter is a parameter obtained by analyzing a capacitor model to be designed;

[0014] A first model is constructed based on the first parameters and the working environment of the capacitor model to be designed.

[0015] Preferably, the first parameter is obtained by analyzing the capacitor model to be analyzed using the FPMEA method to obtain relevant parameters.

[0016] Preferably, the sub-step of solving the finite element model of the second model includes:

[0017] Setting a corresponding calculation module based on the mechanical environment corresponding to the capacitor model to be designed, and performing contact setting, meshing and convergence testing, and load and constraint setting according to the shape of the capacitor model to be designed to obtain a third model;

[0018] The third model is simulated and calculated by adopting an iterative method or a direct method to obtain the stress distribution of the lead and the contact surface of the ceramic body.

[0019] Preferably, the calculation module corresponding to the setting is specifically:

[0020] When the simulation project is plate bending, mechanical impact and constant acceleration project, the calculation module is the transient structure module;

[0021] When the simulation project is a random vibration project, the calculation modules are modal analysis and random vibration modules.

[0022] Preferably, the contact setting is specifically:

[0023] Binding is used for two contact surfaces that are fixed and will not move relative to each other, and friction is used for two contact surfaces that move relative to each other.

[0024] Preferably, the grid division and convergence test are specifically as follows:

[0025] In the second model, the regular geometric model portion is divided into structured meshes using quadrilateral meshes or hexagonal meshes; the irregular geometric model portion is divided into non-structured meshes using triangular meshes or tetrahedral meshes.

[0026] Preferably, the first model is constructed directly in finite element software, or by building a geometric model in CAD software and then importing it into finite element software.

[0027] Preferably, the material property parameters include elastic deformation material parameters and elastoplastic deformation material parameters, the elastic deformation material parameters include a first density, a first elastic modulus and a first Poisson's ratio, and the elastoplastic deformation material parameters include a second density, a second elastic modulus, a second Poisson's ratio, a yield strength and a tangent modulus.

[0028] The present invention also discloses a multi-core multilayer ceramic capacitor model design system, which includes a model building module, a parameter adjustment module, a solution module, and a lead pin calculation module;

[0029] The model building module is used to build a first model, where the first model is a geometric model of the capacitor model to be designed;

[0030] The parameter adjustment module is used to adjust the material property parameters and size parameters of the first model to obtain a second model;

[0031] The solving module is used to solve the finite element model of the second model based on the mechanical environment corresponding to the capacitor model to be designed, so as to obtain the stress distribution of the lead and the contact surface of the ceramic body;

[0032] The lead pin module is used to obtain corresponding lead pins based on the stress distribution of the lead and the contact surface of the ceramic body, and obtain the capacitor model to be designed.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0034] An embodiment of the present invention provides a multi-core multilayer ceramic capacitor model design method and system. By combining the designed ceramic capacitor model with the corresponding mechanical environment and continuously iteratively updating the corresponding design parameters, the relevant lead pins are designed, which can shorten the design cycle of the ceramic capacitor model and improve the efficiency of ceramic capacitor design. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without making any creative efforts.

[0036] Figure 1 Schematic diagram of the design method flow chart;

[0037] Figure 2 This is the front view of the constructed geometric model. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0039] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0040] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combinations and / or subcombinations. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0042] Example 1

[0043] Traditionally, in the process of designing ceramic capacitor models, ceramic capacitors usually have a complex structure, and the design must not only consider the overall results but also related material properties, matching, lead structure, etc., resulting in a long design cycle and low design efficiency.

[0044] This embodiment discloses a method for designing a multi-core multilayer ceramic capacitor model. By combining the designed ceramic capacitor model with the corresponding mechanical environment and continuously iteratively updating the corresponding design parameters, the relevant lead pins are designed. This can shorten the design cycle of the ceramic capacitor model and improve the efficiency of ceramic capacitor design. The schematic diagram of the design method steps specifically implemented in this embodiment is shown in FIG. Figure 1 As shown, the specific method steps include:

[0045] S1: Construct a first model, where the first model is a geometric model of a capacitor model to be designed;

[0046] The first model construction sub-step includes: obtaining first parameters, where the first parameters are obtained by analyzing the capacitor model to be designed; and constructing the first model based on the first parameters and the working environment of the capacitor model to be designed. The first parameters are obtained by analyzing the capacitor model to be analyzed using the FPMEA method to obtain relevant parameters. The first model is constructed directly in finite element software or by creating a geometric model in CAD software and then importing it into the finite element software.

[0047] In step S1 of this embodiment, before constructing the multilayer ceramic capacitor model, it is necessary to obtain various potential failure modes of the constructed ceramic capacitor model and their related causes or mechanisms, so as to avoid the occurrence of these problems when constructing the geometric model, thereby constructing a better combined model to facilitate subsequent parameter debugging. The constructed geometric model is constructed based on the parameters analyzed by the FPMEA analysis method and the environment in which the model needs to work. The model constructed by combining the two makes it possible to obtain the influence of different pin forms on the board bending test of this model product under the same process and raw material conditions. The specific constructed model is as follows: Figure 2 As shown, it includes a pressing head, a PCB, a support rod, a ceramic body, a terminal electrode bottom metal, a terminal electrode Ni+PbSn layer, and a welding layer.

[0048] S2: adjusting the material property parameters and size parameters of the first model to obtain a second model;

[0049] The material property parameters include elastic deformation material parameters and elastoplastic deformation material parameters. The elastic deformation material parameters include a first density, a first elastic modulus and a first Poisson's ratio. The elastoplastic deformation material parameters include a second density, a second elastic modulus, a second Poisson's ratio, a yield strength and a tangent modulus.

[0050] In step S2, the material parameters of the constructed geometric model are mainly set. By setting the material parameters and continuously debugging the model, the best multilayer ceramic capacitor model constructed under a certain material can be obtained, and the equivalent stress, first principal stress, welding end plastic strain, nickel layer equivalent stress and underlying metal equivalent stress in the final constructed ceramic capacitor model can be the most suitable.

[0051] S3: Solving a finite element model of the second model based on the mechanical environment corresponding to the capacitor model to be designed to obtain stress distribution on the contact surface between the lead and the ceramic body;

[0052] The sub-steps of solving the finite element model of the second model include: setting a corresponding calculation module based on the mechanical environment corresponding to the capacitor model to be designed, and performing contact setting, mesh division and convergence testing, and load and constraint setting according to the shape of the capacitor model to be designed to obtain a third model; using an iterative method or a direct method to simulate and calculate the third model to obtain the stress distribution of the lead and the porcelain contact surface.

[0053] The calculation module corresponding to the setting is specifically: select the corresponding module according to different simulation projects: when the simulation project is plate bending, mechanical impact and constant acceleration project, the calculation module is the transient structure module; when the simulation project is a random vibration project, the calculation module is the modal analysis and random vibration module.

[0054] The contact setting is specifically as follows: corresponding contact setting is performed according to different test requirements and the combination form of each part of the multi-core capacitor group: binding is used for two fixed contact surfaces that will not move relative to each other, and friction is used for two contact surfaces that move relative to each other.

[0055] The mesh division and convergence test are specifically as follows: in the second model, for the part of the regular geometric model, a quadrilateral mesh or a hexagonal mesh is used for structural mesh division; for the part of the irregular geometric model, a triangular mesh or a tetrahedral mesh is used for non-structural mesh division. For the regular part of the geometric model, it is easy to use a structural mesh division with higher quality, such as a quadrilateral mesh or a hexahedral mesh; for the irregular part, it is easy to use a non-structural mesh division with better adaptability, such as a triangular mesh or a tetrahedral mesh. For areas with large structural deformation and force gradients and high calculation accuracy requirements, denser meshes should be divided; for non-key areas of concern, sparser meshes should be divided. Reasonable transition meshes should be set between different mesh types and meshes of different densities.

[0056] Load and constraint settings: Load size, direction, distribution, action area, and action duration should meet the test requirements.

[0057] S4: Based on the stress distribution of the lead and the contact surface of the ceramic body, the corresponding lead pin is obtained to obtain a capacitor model to be designed.

[0058] In step S4, after setting various relevant properties for the geometric model, calculation simulation is performed. The simulation analysis calculation methods mainly include iterative method and direct method. The iterative method has a large amount of calculation but high calculation accuracy, while the direct method has a fast calculation speed but low calculation accuracy. The calculation method can be selected according to actual needs. The stress distribution of the lead and the contact surface of the porcelain body is obtained through the simulation test results, and different lead pins are output based on the obtained stress distribution of the lead and the contact surface of the porcelain body.

[0059] This embodiment discloses a method for designing a multi-core multilayer ceramic capacitor model. The coplanar pin capacitor is subjected to a greater principal stress on the ceramic body than the independent pin capacitor, making it more prone to ceramic damage. The stress trends of the two capacitors with different pin forms are basically the same, and the maximum stress points appear at the bending positions at both ends of the lead. It is recommended to chamfer or thicken this part in actual production to reduce stress concentration. This simulation conclusion is consistent with the verification experiment results. By combining the designed ceramic capacitor model with the corresponding mechanical environment and continuously iteratively updating the corresponding design parameters to design the relevant lead pins, the design cycle of the ceramic capacitor model can be shortened and the efficiency of ceramic capacitor design can be improved.

[0060] Example 2

[0061] This embodiment discloses a multi-core multilayer ceramic capacitor model design system, which is mainly used to implement the design method of the first embodiment, including a model construction module, a parameter adjustment module, a solution module and a lead pin calculation module;

[0062] The model building module is used to build a first model, where the first model is a geometric model of the capacitor model to be designed;

[0063] The parameter adjustment module is used to adjust the material property parameters and size parameters of the first model to obtain a second model;

[0064] The solving module is used to solve the finite element model of the second model based on the mechanical environment corresponding to the capacitor model to be designed, so as to obtain the stress distribution of the lead and the contact surface of the ceramic body;

[0065] The lead pin module is used to obtain corresponding lead pins based on the stress distribution of the lead and the contact surface of the ceramic body, and obtain the capacitor model to be designed.

[0066] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-core multilayer ceramic capacitor model design method, characterized in that: The method steps include: Constructing a first model, where the first model is a geometric model of the capacitor model to be designed; wherein the sub-step of constructing the first model includes: obtaining first parameters, where the first parameters are parameters obtained by analyzing the capacitor model to be designed; constructing the first model based on the first parameters and a working environment of the capacitor model to be designed; the first parameters are obtained by analyzing the capacitor model to be analyzed using the FPMEA method to obtain relevant parameters; the first model is constructed directly in finite element software, or by creating a geometric model in CAD software and then importing it into the finite element software; Adjusting material property parameters and dimensional parameters of the first model to obtain a second model; wherein the material property parameters include elastic deformation material parameters and elastic-plastic deformation material parameters, the elastic deformation material parameters include a first density, a first elastic modulus, and a first Poisson's ratio, and the elastic-plastic deformation material parameters include a second density, a second elastic modulus, a second Poisson's ratio, a yield strength, and a tangent modulus; Based on the mechanical environment corresponding to the capacitor model to be designed, the finite element model of the second model is solved to obtain the stress distribution of the lead and the contact surface of the porcelain body; wherein the sub-step of solving the finite element model of the second model includes: setting the corresponding calculation module based on the mechanical environment corresponding to the capacitor model to be designed, and performing contact setting, meshing and convergence testing, and load and constraint setting according to the shape of the capacitor model to be designed to obtain a third model; using an iterative method or a direct method to simulate and calculate the third model to obtain the stress distribution of the lead and the contact surface of the porcelain body; the setting of the corresponding calculation module has The body is: when the simulation project is a plate bending, mechanical impact and constant acceleration project, the calculation module is a transient structure module; when the simulation project is a random vibration project, the calculation module is a modal analysis and random vibration module; the contact setting is specifically: binding is used for two fixed contact surfaces that do not move relative to each other, and friction is used for two contact surfaces that move relative to each other; the meshing and convergence test are specifically: in the second model, for the part of the regular geometric model, quadrilateral mesh or hexagonal mesh is used for structural meshing; for the part of the irregular geometric model, triangular mesh or tetrahedral mesh is used for non-structural meshing; Based on the stress distribution of the lead and the contact surface of the ceramic body, the corresponding lead pins are obtained to obtain a capacitor model to be designed.

2. A multi-core multilayer ceramic capacitor model design system, characterized in that: It includes a model building module, a parameter adjustment module, a solution module and a lead pin calculation module; A model construction module is configured to construct a first model, wherein the first model is a geometric model of a capacitor model to be designed; wherein the sub-step of constructing the first model includes: obtaining first parameters, wherein the first parameters are parameters obtained by analyzing the capacitor model to be designed; and constructing the first model based on the first parameters and a working environment of the capacitor model to be designed; wherein the first parameters are obtained by analyzing the capacitor model to be analyzed using the FPMEA method to obtain relevant parameters; and wherein the first model is constructed directly in finite element software or by creating a geometric model in CAD software and then importing the model into the finite element software. a parameter adjustment module, configured to adjust material property parameters and dimensional parameters of the first model to obtain a second model; wherein the material property parameters include elastic deformation material parameters and elastic-plastic deformation material parameters, the elastic deformation material parameters include a first density, a first elastic modulus, and a first Poisson's ratio, and the elastic-plastic deformation material parameters include a second density, a second elastic modulus, a second Poisson's ratio, a yield strength, and a tangent modulus; A solution module is used to solve the finite element model of the second model based on the mechanical environment corresponding to the capacitor model to be designed, and obtain the stress distribution of the lead and the contact surface of the porcelain body; wherein the sub-step of solving the finite element model of the second model includes: setting the corresponding calculation module based on the mechanical environment corresponding to the capacitor model to be designed, and performing contact setting, meshing and convergence testing, and load and constraint setting according to the shape of the capacitor model to be designed to obtain a third model; using an iterative method or a direct method to simulate and calculate the third model to obtain the stress distribution of the lead and the porcelain body contact surface; the setting of the corresponding calculation module The modules are specifically as follows: when the simulation project is a plate bending, mechanical impact, or constant acceleration project, the calculation module is a transient structure module; when the simulation project is a random vibration project, the calculation module is a modal analysis and random vibration module; the contact setting is specifically as follows: binding is used for two fixed contact surfaces that do not move relative to each other, and friction is used for two contact surfaces that move relative to each other; the meshing and convergence test is specifically as follows: in the second model, for the part with regular geometric models, quadrilateral meshes or hexagonal meshes are used for structural meshing; for the part with irregular geometric models, triangular meshes or tetrahedral meshes are used for non-structural meshing; The lead pin calculation module is used to obtain the corresponding lead pin based on the stress distribution of the lead and the contact surface of the ceramic body, and obtain the capacitor model to be designed.

Images