CN1783055A - Automatic designing method for ICT test conversion PCB - Google Patents

Abstract

The present invention relates to automatic design method of ICT test conversion PCB. The method includes: obtaining the connection corresponding relation between the measured PCB test points and the ICT test pin bed and creating the netlist file required for PCB design based on the connection corresponding relation; and subsequent creating the PCB design file with the netlist and PCB converting layout design. The present invention designs conversion PCB for ICT test in automatic mode, and thus has greatly raised conversion PCB design efficiency and high accuracy.

Description

An automatic design method for switching PCBs for ICT testing

technical field

The invention relates to the technical field of PCB (printed circuit board) design, in particular to an automatic design method for a conversion PCB for ICT (on-line test) testing.

Background technique

ICT testing is a widely used inspection method for PCBs. It is used to test the electrical performance and electrical connection of the online components made on the PCB. Through the ICT test, it is possible to check whether the PCB has manufacturing defects and whether the components are reliable. The ICT test mainly checks the online single components and The open and short circuit conditions of each circuit network, that is to say, the ICT test is a standard test for PCB products.

When performing PCB testing, it is necessary to connect the PCB to be tested to an ICT testing device through a connecting device, and the ICT testing device is a product specially used for PCB testing. The connection device is an important part of the connection between the PCB to be tested and the test bed of needles provided by the ICT test device, and the structures of the connection devices currently used are various. Among them, there is a relatively simple connection device, that is, a conversion PCB is used as the connection device between the tested PCB and the ICT test device, and the metal pads on the upper and lower surfaces of the conversion PCB are interconnected through the wiring inside the PCB, thereby improving The service life of the connection device (that is, the conversion PCB) ensures the reliability of the connection.

The conversion PCB is designed according to the structure of the test bed of needles provided by the ICT test device and the position information of the test points on the PCB to be tested. The current design method for the conversion PCB is to manually use PCB design software to design the conversion PCB. The disadvantage of this design method is that each conversion PCB is manually designed, which makes the design efficiency low; moreover, there are too many human intervention links in the conversion PCB design process, resulting in a high error rate.

Contents of the invention

In view of the above-mentioned problems in the prior art, the object of the present invention is to provide an automatic design method for a conversion PCB for ICT testing, thereby significantly improving the design efficiency of the conversion PCB, and the design result is accurate.

The purpose of the present invention is achieved through the following technical solutions:

The invention provides an automatic design method for a conversion PCB for ICT testing, comprising:

A. According to the test point on the printed circuit board to be tested and the connection correspondence relationship between the online test needle bed and the package file, the netlist file required for the printed circuit board design is generated;

B. Call the netlist file to create a printed circuit board design file, and convert the layout design of the printed circuit board.

The connection correspondence between the test points on the printed circuit board to be tested and the online test bed of needles can be obtained through the following steps:

C1. Obtain the test point on the printed circuit board to be tested and the position information file of the online test bed of needles;

C2. Obtain the connection relationship between the test points on the printed circuit board to be tested and the online test bed of needles according to the position information file.

The location information file is: a file that can be recognized by the printed circuit board design tool.

Described step C1 comprises:

C11. Extract the location information and network name information of the test point from the printed circuit board design file of the tested printed circuit board, and generate a corresponding test point location information file;

C12. Generate the position information file of the online test needle bed according to the position and name information of the needles in the online test needle bed, and save the position information file of the online test needle bed.

Among the present invention, the content described in the netlist file described in step A comprises:

Device package name, device name, connection relationship between device pins and connection relationship name.

The automatic design method of the conversion printed circuit board for online testing also includes:

Extract the test point and the coordinate information of the needle on the test needle bed from the test point position information file of the printed circuit board to be tested and the position information file of the online test needle bed, and generate a printed circuit board design tool that can identify the test point and include the test point and the layout file of the coordinate information of the needle on the test needle bed;

And the step B includes:

Create a printed circuit board design file by using the netlist file and the layout file, and convert the layout design of the printed circuit board.

The contents of the package file include:

Package device name, specification information.

The present invention also provides an automatic design method for converting printed circuit boards for online testing, including:

D. Obtain the description information of the online test bed of needles, and generate part of the netlist file required for converting the printed circuit board design according to the description information and the corresponding package file;

E, utilize described partial netlist file to create corresponding printed circuit board design file, and carry out the layout design of partial conversion printed circuit board, save the layout design result of described partial conversion printed circuit board;

F. When designing a conversion printed circuit board for online testing based on the same online testing device, generate a corresponding netlist file according to the description information of the test point on the printed circuit board to be tested and the corresponding package file, and call the saved part Convert layout design results for printed circuit boards;

G. Import the netlist file corresponding to the test points into the layout design result of the partially converted printed circuit board to obtain a new printed circuit board design file, and perform layout design of the converted printed circuit board.

The descriptive information of the online test bed of needles includes:

The coordinate position and name of the needle on the test needle bed, the installation hole of the test needle bed installed on the converted printed circuit board and the size of the converted printed circuit board mold;

The descriptive information of the test points includes:

The network name information of the test point and the connection relationship with the online test bed of needles.

The use of the partial netlist file described in step E to create a corresponding printed circuit board design file includes:

Obtain the coordinate position information of the on-line test bed of needles, and generate a layout file that can be recognized by the printed circuit board software;

Create a corresponding printed circuit board design file by using the partial netlist file and the layout file;

Described step G comprises:

Obtain the coordinate information of the test point and generate a layout file that can be recognized by the printed circuit board software;

Import the netlist file and layout file corresponding to the test points into the layout design result of the partially converted printed circuit board to obtain a new printed circuit board design file, and perform the layout design of the converted printed circuit board.

As can be seen from the technical solution provided by the present invention above, since the present invention designs the conversion PCB applied in the ICT test in an automated manner, at the same time, the partial position information files or corresponding PCB design files used in the conversion PCB design process can also be Repeated use, thus greatly improving the efficiency of converting PCB designs. Moreover, in the present invention, since there are few links of manual intervention in the entire conversion PCB design process, the accuracy of the guaranteed conversion PCB design is relatively high.

Description of drawings

Figure 1 is a schematic structural diagram of an ICT test system using a conversion PCB as a connecting device;

Figure 2 is a flow chart of the method of the present invention.

Detailed ways

The core idea of the present invention is to automatically convert the design of the PCB according to the position information of the test point of the PCB to be tested and the position information of the test bed of needles on the ICT test device that can be obtained, thereby improving the efficiency of the conversion PCB design, and effectively Reduced error rates during conversion of PCB designs.

The main process of the automatic design method of conversion PCB for ICT test of the present invention comprises:

1. Generate the entry file of the PCB design—the netlist file through the netlist generation software according to the obtained connection correspondence relationship file and package file of the upper and lower layer test pins;

2. Create a new PCB file in the PCB design tool (that is, convert the layout design file of the PCB), and import the generated netlist file; if the template for the PCB design of the ICT test bed of needles is saved, the netlist file of process 1 Import the template of the saved position information file of the ICT test needle bed, and complete the layout of the mounting holes and the package connected to the lower test needle;

3. According to the test point position information file of the PCB to be tested and the position information file of the ICT test needle bed, the layout file of the package connected to the upper and lower layer test pins is generated;

4. Import the layout file of the package connected to the upper and lower test pins, and complete the layout of the package connected to the upper and lower test pins;

For the above process 3 and process 4, if the netlist file mentioned in process 2 is imported into the template of the PCB design about the ICT test bed of needles, it is only necessary to generate the layout file on the upper layer of the converted PCB and convert it to Just import;

5. According to the rules of PCB design, the automatic routing software is used to complete the automatic routing of the newly created PCB file, and the layout design result of the converted PCB is obtained. The automatic routing software is a function of ordinary PCB design tools.

A kind of ICT test of the present invention will be described further below to the specific implementation of the automatic design method of conversion PCB, as shown in Figure 2, specifically comprise the following steps:

Step 21: The layout design of the converted PCB is realized based on the test points on the PCB to be tested and the position information of the needles in the ICT test bed of needles, so firstly it is necessary to obtain the test points on the PCB to be tested and the position of the ICT test bed of needles information file; and, in order to realize the automatic design of the converted PCB, the position information file needs to be a file that can be recognized by the PCB design tool;

The methods for obtaining the location information file respectively include:

For described test point position information file is to extract the position information of test point, the corresponding file generated after network name information from the PCB design file of tested PCB, the position information of described test point is the coordinate of test point information; the test point location information file can be obtained while completing the PCB design file of the tested PCB;

For the position information file of the ICT test bed of needles, the position information file of the ICT test bed of needles is generated according to the position and name information of the needles in the ICT test bed of needles, and the position information file of the ICT test bed of needles also includes Convert the mounting hole information on the PCB and its PCB mold size information, etc.;

The location information file of the ICT test needle bed records the description information of the ICT test equipment needle bed; the description information is usually provided by the ICT test equipment supplier, and the corresponding file format conversion is performed according to the description information provided by it, and converted into PCB design The software can recognize the accepted ICT test bed of needles location information file format.

In order to further improve the efficiency of converting PCB design, and because it often happens that the same ICT test device is used to test different PCB finished products, the position information file of the corresponding ICT test bed of needles obtained can also be saved. When performing other tests based on the same When converting the PCB layout design of the ICT test device, the saved file can be called to carry out the corresponding design without reacquiring the position information file of the ICT test bed of needles.

Step 22: After obtaining the position information file of the test point of the PCB to be tested and the position information file of the ICT test needle bed, the upper test pin in contact with the tested PCB and the lower test pin in contact with the ICT test device can be obtained accordingly The connection corresponding relationship file between them, and the corresponding packaging file; the content contained in the corresponding relationship file is the connection corresponding relationship of the upper and lower test pins obtained according to the principle of distance priority; Surface-mount PAD (pad) package files and via-hole package files for needle contact. The package files include: package device name, specification information, etc.

Step 23: According to the corresponding relationship file and the corresponding packaging file obtained, the netlist file (netlist) required for PCB design can be generated by the corresponding software, and the netlist file is a necessary file for PCB design. The table file usually records information such as the devices contained in the PCB to be designed and their connection relationships; here, the content described in the netlist file includes: device package name, device name, connection relationship between device pins, and connection Relationship name; Wherein, described device name (REFDES) can allow netlist generation software to distribute automatically as the information of distinguishing device; Described device encapsulation name is the encapsulation file name that step 22 provides; The connection relationship between described device pins is The connection relationship between device pins and pins is provided by the connection correspondence file of the upper and lower layer test pins described in step 22; the name of the connection relationship is to distinguish the network name, which can be automatically assigned by the netlist generation software ;

An example of the netlist file is shown below:

$PACKAGES

PAD1! PAD1; T1 T2 T3

PAD2! PAD2; B1 B2 B3

$NETS

NET1; T1.1 B2.1

NET2; T2.1 B1.1

NET3; T3.1 B3.1

$END

Among them: PAD1 and PAD2 are package names, T1, T2, T3 and B1, B2, B3 are device names, NET1, NET2, NET3 are connection relationship names, T1.1 B2.1, T2.1 B1.1, T3. 1 B3.1 is the connection relationship between device pins;

The generating software of described netlist file is existing operating software, can be obtained by developing through various general computer languages, also can be obtained through the secondary development environment development that software such as EDA (electronic design is automatic) provides;

In order to further improve the efficiency of converting PCB design, in this step, it can also include generating a layout file according to the coordinate information of the test point in the position information file of the test point of the PCB to be tested or the coordinate position information of the ICT test bed of needles, so The layout file described above is used to limit the coordinate position of each device and package on the PCB design page. Taking Allegro PCB (a PCB design tool) design software as an example, the layout file can be in Pacement or ses file format;

An example of the layout file is as follows:

UUNITS=MILS

B3 351400.00 240400.00 0 PAD2

B2 351600.00 240400.00 0 PAD2

B1 351800.00 240200.00 0 PAD2

T3 351400.00 240200.00 0 PAD1

T2 351800.00 240400.00 0 PAD1

T1 351600.00 240200.00 0 PAD1

It can be seen that the layout file contains the coordinate position information of each device.

Step 24: Use the netlist file to create a PCB design file, and perform the layout design of the converted PCB. The design process is the same as the existing PCB design process, that is, the usual PCB design process is used to complete the layout design of the converted PCB ;

Wherein, if the corresponding layout file is also generated in step 23, then in this step, it is also necessary to arrange each device, package, connection, etc. of the converted PCB design on the PCB design according to the layout file and the netlist file. In the corresponding page of the tool, the regular layout of each device, package, etc. on the PCB design page can greatly improve the design efficiency of the converted PCB.

The present invention also provides an automatic design method of a conversion PCB for ICT testing, the processing procedure of the method is basically the same as that of the above-mentioned method, the difference is only in the reusable information files about the ICT testing needle bed processing method;

Described method specifically comprises:

(1) Obtain the description information of the ICT test bed of needles, and independently generate part of the netlist files required for partial conversion PCB design according to the description information and the corresponding package file; the description information includes: the ICT test bed of needles Coordinate position information, name, installation holes on the corresponding converted PCB and converted PCB mold size information, etc.;

(2) Utilize described partial netlist file to create PCB design file, and carry out the layout design of partial conversion PCB, then save the layout design result of described partial conversion PCB, can flexibly in case the design of subsequent related conversion PCB Call the saved PCB design file, and convert the PCB design based on the file;

(3) when converting PCB design, obtain the descriptive information of the test points on the PCB to be tested, and generate netlist files according to the described descriptive information and corresponding packaging files; the descriptive information of the described test points includes test points name information and connection relationship with the ICT test bed of needles;

When performing conversion PCB design, determine the selected PCB design file name of the layout design result of the partial conversion PCB according to the applied ICT test device, and call the corresponding partial conversion PCB layout design result according to the determined PCB design file name;

(4) the netlist file described in step (3) is imported in the described PCB design file that preserves the layout design result of part conversion PCB, and converts the layout design of PCB;

Equally, in this step (4), also can comprise generating corresponding layout file according to the coordinate information of the test point in the position information file of the test point of PCB to be tested, and according to described layout file and described netlist file Arrange the devices, packages, connections, etc. for the converted PCB design in the PCB file page of the PCB design tool to improve the efficiency of the converted PCB design.

It can be seen that this method also realizes the automatic design of the conversion PCB, and can ensure that the position information file of the ICT test bed of needles can be designed and saved as an independent package, thereby further facilitating the layout design of other related conversion PCBs The procedure calls it.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1, a kind of on-line testing is characterized in that with the automatic design method of conversion printed circuit board (PCB), comprising:

A, generate according to the test point on the printed-wiring board (PWB) printed circuit board (PCB) to be tested and the connection corresponding relation between the on-line testing needle-bar and package file and to carry out the needed net meter file of PCB design;

B, call described net meter file and create the PCB design file, and change the topological design of printed circuit board (PCB).

2, the on-line testing according to claim 1 automatic design method of conversion printed circuit board (PCB), it is characterized in that test point on the described printed-wiring board (PWB) printed circuit board (PCB) to be tested and the connection corresponding relation between the on-line testing needle-bar can obtain by following steps:

C1, obtain the test point on the printed circuit board (PCB) to be tested and the positional information file of on-line testing needle-bar;

C2, obtain test point on the printed circuit board (PCB) to be tested and the annexation between the on-line testing needle-bar according to described positional information file.

3, on-line testing according to claim 2 is characterized in that with the automatic design method of conversion printed circuit board (PCB) described positional information file is: the file that the PCB design instrument can be discerned.

4, according to claim 2 or the 3 described on-line testings automatic design methods of changing printed circuit board (PCB), it is characterized in that described step C1 comprises:

C11, in the PCB design file of tested printed circuit board (PCB), extract positional information, the network name information of test point, and generate corresponding test point positional information file;

C12, generate the positional information file of online testing needle bed, and preserve the positional information file of described on-line testing needle-bar according to position, the name information of pin in the on-line testing needle-bar.

5, on-line testing according to claim 1 is characterized in that with the automatic design method of conversion printed circuit board (PCB), and the content that the described net meter file of steps A is described comprises:

Annexation and annexation title between device package name, device name, device pin.

6, the on-line testing according to claim 2 automatic design method of conversion printed circuit board (PCB) is characterized in that this method also comprises:

In the positional information file of the test point positional information file of printed circuit board (PCB) to be tested and on-line testing needle-bar, extract the coordinate information of pin on test point and the test needle-bar, and generate the topology file that includes the coordinate information of pin on described test point and the test needle-bar that the PCB design instrument can be discerned;

And described step B comprises:

Utilize described net meter file and described topology file to create the PCB design file, and change the topological design of printed circuit board (PCB).

7, the on-line testing according to claim 1 automatic design method of conversion printed circuit board (PCB) is characterized in that the content that described package file comprises comprises:

Packaging title, specification information.

8, a kind of on-line testing is characterized in that with the automatic design method of conversion printed circuit board (PCB), comprising:

D, obtain the descriptor of on-line testing needle-bar, and generate according to described descriptor and corresponding package file and to change the needed part net meter file of PCB design;

E, utilize described part net meter file to create corresponding PCB design file, and carry out the topological design of part conversion printed circuit board (PCB), preserve the topological design result of described part conversion printed circuit board (PCB);

F, when carrying out based on the on-line testing of identical online testing device with the conversion PCB design, descriptor and corresponding package file according to test point on the printed circuit board (PCB) to be tested generate corresponding net meter file, and call the topological design result of the part conversion printed circuit board (PCB) of preservation;

G, the corresponding net meter file of described test point imported among the topological design result of described part conversion printed circuit board (PCB) and obtain new PCB design file, and change the topological design of printed circuit board (PCB).

9, the on-line testing according to claim 8 automatic design method of conversion printed circuit board (PCB) is characterized in that:

The descriptor of described on-line testing needle-bar comprises:

Coordinate position, title, the test needle-bar of pin are installed on mounting hole and the conversion printed circuit board (PCB) mould size on the conversion printed circuit board (PCB) on the test needle-bar;

The descriptor of described test point comprises:

The network name information of test point reaches the annexation with described on-line testing needle-bar pin.

10, the on-line testing according to claim 8 automatic design method of conversion printed circuit board (PCB) is characterized in that:

Step e is described to be utilized described part net meter file to create corresponding PCB design file to comprise:

Obtain the co-ordinate position information of on-line testing needle-bar pin, and generate the topology file that printed circuit board (PCB) software can be discerned;

Utilize described part net meter file and described topology file to create corresponding PCB design file;

Described step G comprises:

Obtain the coordinate information of test point, and generate the topology file that printed circuit board (PCB) software can be discerned;

The net meter file of described test point correspondence and topology file are imported among the topological design result of described part conversion printed circuit board (PCB) and obtain new PCB design file, and change the topological design of printed circuit board (PCB).

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