JPH1125141A - Potential difference conductor gap check system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To judge whether a conductor gap is suitable or not by storing, inputting pattern data under designing in a substrate design system and comparing them with prepared gap data and net group data. SOLUTION: At a gap data preparing device 7, circuit net information, the voltage of a circuit net and net connection information or the like are stored and inputted from circuit data 4. In the case of substrate design, the standard value of a minimum gap between the conductors of a substrate is stored and inputted, and the group voltage data of the same voltage are prepared and stored. Then, while utilizing a net group file 8 and a gap data file 9, the net group data are prepared and stored. Further, the minimum gap between groups is operated and stored from the standard value and a potential difference between the groups. Then, the pattern data are inputted from a substrate design system 9 and comparatively operated with the stored minimum gap, and it is judged from the result whether the conductor gap is suitable or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for checking a minimum conductor gap based on a potential difference between conductors in a printed circuit board design CAD.

[0002]

2. Description of the Related Art In general, a conductor gap check in a printed circuit board design CAD is performed with a gap value preset in a circuit net. In this case, the conductor gap value between the circuit nets is processed not at the optimum value but at the maximum value.
The minimum value of the conductor gap is calculated by multiplying the safety factor by the potential difference between the conductors. However, in practice, since the minimum value is calculated based on the maximum potential difference of the circuit, the maximum value of the conductor gap value is calculated.
For this reason, most of the gaps between the nets need to be set again for each adjacent circuit net, and the design is made by taking into account the gap value with the know-how of the designer. As a result, the following problems occur. To calculate the potential difference between circuit nets and design the gap value with reference to the gap value table etc.
Inefficient. Check errors and leaks occur due to gap value setting errors.

[0003]

In view of these problems, the present invention calculates a potential difference between circuit nets and calculates and outputs a minimum gap value between circuit nets based on the potential difference between nets and a standard table. In addition, the purpose is to construct a conductor gap check system that checks the conductor gap under design.

[0004]

Means for storing and inputting circuit net information, circuit net voltage, net connection information, and the like from circuit data, and a standard for a minimum gap size between conductor patterns on a printed board when designing a board. Means for storing and inputting values; means for creating and storing group voltage data representing groups of the same voltage; means for creating and storing net group data representing combinations of nets belonging to the group; Means for calculating and storing the minimum gap between the groups, means for inputting pattern data from the board design system, and performing a comparison operation with the stored minimum gap, and determining whether the conductor gap is appropriate or not based on the comparison operation result. A gap data creating device having means for determining appropriateness, and a gap data file for storing gap data between the groups. When, configured with a net group files to be stored the net group data of the same gap.

[0005] Further, a conductor gap data generating apparatus is provided with a conductor gap input section for inputting a standard value, a reference conductor storing table data of a potential difference between conductors inputted from the conductor gap input section and a minimum conductor gap. A gap table, a circuit data input unit for inputting circuit net information, circuit net voltage, net connection information, and the like from circuit data, a circuit data memory for storing the circuit data, and the same voltage group based on the circuit data A group voltage data creating unit, a group voltage data memory for storing group voltage data, a net group data creating unit for creating a list of net names belonging to the same group, a net group data memory for storing net group data, A group gap data calculator for calculating a conductor gap between groups; A conductor gap data memory for storing the conductor gap data between Ttogurupu, a pattern data input unit from the board design system inputs the conductor information of the substrate,
It comprises a conductor gap data stored in a matrix type gap data file and a net gap file, and a pattern gap determining unit for comparing and determining net group information with pattern data.

Further, a compressed gap data creation unit for creating matrix gap data for aggregating net groups of the same gap stored in the conductor gap memory into a new group is additionally provided in the conductor gap data creation apparatus.

Further, the conductor gap data creation device includes a correction counting memory for correcting the conductor gap value according to the difference in the conductor gap between the substrate material, the pattern generation method, and the like, and a check condition selection input unit for selectively inputting the check condition of the pattern. A check condition memory for storing the selected and inputted check condition is additionally provided. Further, a correction coefficient memory stores a correction coefficient table determined according to differences in water absorption, surface properties, etc. of the design-selected printed circuit board material, and a method of forming a pattern of the design-selected printed circuit board. A pattern formation method correction table that stores a table of correction counts determined by the difference in use, a use environment correction table that stores a table of correction counts determined by the use environment of a printed circuit board, and a circuit design Correction table storing a correction count table determined by the difference in signal waveform superimposed on the net, and a pattern storing a correction count table determined by a difference in pattern shape designed on the substrate Write a shape correction table or a table of correction counts determined according to the intended use of the designed circuit. Or a to have application site correction table, or shall combining these.

Further, a special calculation table for a conductor gap for special use such as an ultra-high frequency circuit and a spark gap for high voltage discharge is additionally installed in the conductor gap data creating apparatus. Further, a pattern shape determining unit for determining and outputting a partial pattern shape during board design based on the pattern data from the pattern input unit is additionally installed in the conductor gap data creating apparatus.

Further, in the conductor gap data creating apparatus, a check net display control section for changing the color of the net during the pattern gap check and performing display control such as addition of a special symbol is additionally provided on the display section of the board design system. Furthermore, the conductor gap data creation device, the display unit of the board design system,
An inappropriate location display control unit that performs display control such as changing the color of the inappropriate location and adding a special symbol is additionally installed. Further, a pattern data input unit, a pattern shape determination unit, a pattern gap determination unit, a check display control unit, and the like are integrally installed in the board design system.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A potential difference between conductors and a standard value of a conductor gap are stored and input in advance. Gap data and net group data are created based on the circuit data and the standard values. The board design system inputs pattern data under design, compares the pattern data with the gap data and the net group data, and determines the appropriateness or inappropriateness of the conductor gap under design.

[0011]

FIG. 1 is a block diagram of a main part of an embodiment of a conductor gap checking system according to the present invention, FIG. 2 is a block diagram of a main part of an embodiment of a gap data creating apparatus according to the present invention, and FIG. FIG. 4 is an explanatory diagram showing an operation flow, FIG. 4 is an explanatory diagram showing a relationship between a circuit diagram and a substrate pattern diagram displayed on a CAD display unit of the system according to the embodiment, and FIG. 5 (a) is an explanatory diagram showing circuit data grouping. (B) is an explanatory view showing creation of compressed data. In FIG. 1, reference numeral 1 denotes a conventionally used CAD system for performing circuit design and printed circuit board design. The CAD system 1 includes a circuit design system 3 for designing a circuit diagram and applied voltage data of each net constituting the circuit, a circuit data file 4 for storing the designed circuit data, a pattern data of a printed circuit board, a land shape, A printed conductor pattern (abbreviated as “conductor” in this description) on a board based on the board data file 5 storing board data such as data, part shape data, and part terminal data, and the circuit data and the board data. And a board design system 6 for designing the board shape and the like.

Reference numeral 2 denotes a potential difference conductor gap checking system according to the present invention, which is means for storing and inputting circuit net information, circuit net voltage, net connection information, and the like from circuit data 4; Means for storing and inputting the standard value of the minimum gap; means for generating and storing group voltage data representing a group of the same voltage; means for generating and storing net group data representing a combination of nets belonging to the group; Means for calculating and storing the minimum gap between the groups based on the potential difference between the groups, and means for inputting pattern data from the board design system 6 and comparing and calculating with the stored minimum gap.
A gap data generating device 7 having means for judging the appropriateness or inappropriateness of the conductor gap based on the result of the comparison operation, a gap data file 9 for storing gap data between groups, and a net for storing net group data of the same gap. And a group file 8.

In FIG. 2, conductor gap data is input in advance from a conductor gap data input unit 21, and conductor gap data serving as a reference is stored in a reference conductor gap table 22. A correction coefficient and a selection condition for correcting the reference value are stored and input to the correction coefficient memory 23. Correction coefficient memory 23
Is a board material correction table 23a storing a table of correction counts determined according to differences in water absorption, surface properties, heat resistance properties, etc. of the selected printed board material, and pattern formation of the selected printed board. Method (simple printing of conductor on substrate, conductor embedded in substrate, insulation coating on conductor, etc.)
The pattern formation method correction table 23b which stores a table of correction counts determined by the differences in the use environment of the manufactured printed circuit board (normal atmosphere, hot and humid environment, hot spring / shore environment, gas and dust environment, etc.) The use environment correction table 23c which stores a table of correction counts determined by the above, and a table of correction counts determined by differences in signal waveforms (DC, sine wave, pulse wave, etc.) superimposed on a circuit designed net. Signal correction table 23
d, pattern shape correction table 23e storing a table of correction counts determined by differences in pattern shapes designed on the substrate (parallel shape, circular shape, needle shape, etc.), or the purpose of using the designed circuit Application location correction table that stores a table of correction counts determined by differences (high power circuit, high thermal operation circuit, high reliability circuit, etc.)
(Not shown) or a combination thereof. Reference numeral 24 denotes a special calculation table for a conductor gap for special use such as a super high frequency circuit and a spark gap for high voltage discharge.

The check conditions of the board to be designed are input from a check condition selection input section 25 in which the check conditions are displayed in a table format and selected and input by a designer, and are stored and input in a check condition memory 26. Circuit data during circuit design is input from the board design system 6 to the circuit data input unit 27 as pattern data.
Is stored and input.

FIG. 4 stored in the circuit data memory 28
The circuit data such as the net name and the voltage as displayed on the circuit diagram screen is read out by the group voltage data creating unit 29 to form a net group of nets of the same voltage, and is registered and stored in the group voltage memory 30. ,on the other hand,
The names of the nets constituting the net group are created by the net group data creation unit 31 and registered and stored in the net group data memory 32. FIG. 5A shows a data format for grouping circuit data. The inter-group gap data calculation unit 33 calculates potential difference data from the voltage data between net groups, and based on the standards such as the reference conductor gap table 22, the correction coefficient memory 23, and the special calculation table 24, calculates the minimum potential difference data for each potential difference data. The conductor gap is calculated, grouped for each same gap, and registered and stored in the conductor gap data memory. Compressed gap data generator 35
Creates a new net group for each same gap value from the conductor gap data, and registers and stores it in the gap data file 8 and the net group file 9. FIG. 5B is a diagram showing a data format conversion state for creating compressed data. Gap data and net group data are compressed and converted into compressed gap data and new net group data. This regrouping is for compressing the storage file capacity. In the case of a small-scale circuit system or a simple system, the calculation result of the inter-group gap data calculation unit 33 is directly transmitted to the gap data file 8 and the net group file. 9 can be registered and stored.

The pattern data being designed by the board design system 6 is input via a pattern data input unit 36,
It is stored and input to the pattern data memory 37. The pattern gap determination unit 39 compares the conductor gap value of the input and stored pattern data with the conductor gap value registered and stored in the gap data file 8 and the net group file 9 described above, and determines that the gap value of the input pattern data is , A comparison is made as to whether the value is equal to or greater than the standard value, and a determination is made as to whether it is appropriate or inappropriate. FIG. 4 is a substrate pattern diagram showing the relationship between the circuit diagram and the gap value in the substrate pattern diagram. The pattern shape determining unit 38 determines the shape of the input pattern data. Based on the shape data, the inter-group gap data calculation unit 33 recalculates a partial gap value, re-inputs it to the pattern gap determination unit 39, and determines the gap of the pattern local part.

The check net display control section 41 is a display control section for displaying colors and symbols on the net portion currently being checked on the display screen of the board design system 6. In addition, when an inappropriateness determination output is issued from the pattern gap determination unit 39, the inappropriateness location display control unit 40 controls the display of the additional display of the color or the symbol of the inappropriateness portion. Interface part 4
Reference numeral 2 denotes control means for performing interface control of control signals with the circuit design system 3 and the board design system 6. The system memory 44 is a memory unit that stores a program for an operation sequence of the apparatus, and the control unit 43 controls the operation sequence of the apparatus according to the operation sequence of the system memory 44.

FIG. 3 is an operation flow diagram for the operations and operations described above. The overall operation flow will be described again with reference to FIG. Before starting the work for checking the conductor gap, a basic file in which relation data between the potential difference and the conductor gap is stored is created ST1 in advance. As the circuit data, the circuit data 4 previously designed and input by the circuit design system 3 is stored and input ST2. On the other hand, the check condition of the board conductor pattern for each circuit is individually stored and input ST3 from the check condition input unit 26. Based on the stored and input circuit data, a pre-stage process is shown in FIG.
Group voltage data creation ST5 and net group creation ST4 are performed. Then, from these data,
The inter-group gap data shown in FIG.
Then, a matrix type gap data file ST4 and a net group data file ST8 are created and stored. The pattern data under design is input to the circuit data input unit 27.
Then, a memory input ST9 is performed. The pattern data shape determination unit 38 determines and outputs a partial pattern shape from the circuit data ST10. The pattern interval judging unit 39 outputs a comparison operation ST11 of the pattern gap and a judgment output of the appropriateness or unsuitability of the pattern gap based on the gap data file 8, the net group data file 9, the basic file, the pattern data, the pattern shape judgment data, and the like. ST1 to perform
2. The unsuitable portion display control unit 40 receives the determination output of the unsuitability and displays the unsuitable pattern of the board design system 6 by changing the color or adding a special symbol to the display control ST.
Step 13 is performed. As described above, the potential difference conductor gap check system 2 of the embodiment according to the present invention is installed between the circuit design system 3 and the board design system 6 so that the designer can check the conductor gap during the board design in real time without leakage and efficiently. In addition, a design error can be known in advance in the process of designing a board, and a corrected design can be performed.

[0019]

The present invention is embodied in the form of the embodiment described above, and has the following effects. The potential difference between the conductors and the standard value of the conductor gap are stored and input in advance.
The gap data and the net group data are created based on the circuit data previously designed and input and the standard value.
The board design system stores and inputs the pattern data under design, compares the pattern data with the gap data and the net group data, and determines the appropriateness or inappropriateness of the conductor gap under design. The display of the net portion and the unsuitable portion during the conductor gap check is controlled by changing colors or adding symbols to the display portion of the board design system to inform the designer. In this manner, a conductor gap check system for calculating the potential difference between the circuit nets, calculating and outputting the conductor gap based on the standard table of the minimum gap value, and checking the conductor gap being designed has been constructed.

[Brief description of the drawings]

FIG. 1 is a main block diagram of an embodiment of a conductor gap chuck system according to the present invention.

FIG. 2 is a main part block diagram of an embodiment of a gap data creation device according to the present invention.

FIG. 3 is an explanatory diagram illustrating an operation flow of the system according to the embodiment;

FIG. 4 is an explanatory diagram showing a relationship between a circuit diagram and a substrate pattern diagram displayed on a CAD display unit of the system according to the embodiment.

FIG. 5A is an explanatory diagram showing grouping of circuit data, and FIG. 5B is an explanatory diagram showing creation of compressed data.

[Description of Signs] 1 CAD system 2 Potential difference conductor gap check system 3 Circuit design system 4 Circuit data 5 Board data 6 Board design system 7 Gap data creation device 8 Gap data file 9 Net group file 21 Conductor gap data input unit 22 Reference conductor Gap table 23 Correction coefficient memory 23a Substrate material correction table 23b Pattern formation method correction table 23c Usage environment correction table 23d Signal waveform correction table 23e Pattern shape correction table 24 Special calculation table 25 Check condition selection input section 26 Check condition memory 27 Circuit data input Unit 28 circuit data memory 29 group voltage data creation unit 30 group voltage data memory 31 net group data creation unit 32 net group data memory 33 between groups Gap data calculating unit 34 conductor gap data memory 35 the compressed gap data creation unit 36 pattern data input unit 37 pattern data memory 38 pattern determination unit 39 pattern gap determining unit 40 improper position display control unit 41 checks the net display control unit

Claims (16)

[Claims] 1. A circuit design system for designing an electronic circuit using CAD (Computer Aided Design), and a board design system for designing a printed circuit board based on circuit data generated by the circuit design system. Means for storing and inputting net information, voltage of circuit nets, net connection information, and the like, and a minimum gap dimension (hereinafter referred to as a conductor) of a conductor pattern (hereinafter referred to as a conductor) of a printed board (hereinafter referred to as a board) in designing the board. Means for storing and inputting the standard value of the following), means for creating and storing group voltage data representing a group of the same voltage, means for creating and storing net group data representing a combination of nets belonging to the group,
Means for calculating and storing the minimum gap between the groups from the standard value and the potential difference between the groups, and means for storing and inputting pattern data from the board design system and performing a comparison operation with the stored minimum gap. A gap data creating device having means for determining whether the conductor gap is appropriate or inappropriate from the comparison operation result; a gap data file storing gap data between the groups; and storing net group data of the same gap. The gap between conductors during or after creation by the board design system is compared based on the potential difference between conductors and the standard value of the conductor gap, which is stored in advance, and is determined as appropriate or inappropriate. A potential difference conductor gap check system, characterized in that: 2. A conductor gap data creating apparatus comprising: a conductor gap data input unit for inputting the standard value; and reference data for a potential difference between conductors input from the conductor gap data input unit and the minimum conductor gap. The stored reference conductor gap table, circuit net information from the circuit data,
A circuit data input unit for inputting a voltage of a circuit net, net connection information, and the like; a circuit data memory for storing the circuit data; a group voltage data creating unit for creating the same voltage group from the circuit data; A group voltage data memory for storing data,
A net group data creating unit that creates a list of net names belonging to the same group; a net group data memory that stores the net group data; and a group gap that calculates a conductor gap between the net groups from a potential difference between the net groups. A data operation unit, a conductor gap data memory for storing conductor gap data between the net groups, a pattern data input unit for inputting conductor information of the board from the board design system, the matrix gap data file and a net group file A pattern gap determining unit for comparing and determining the conductor gap data and the net group information stored in the pattern data with the pattern data. The spacing data creating device is configured to determine the conductor gap data of the board under design from the circuit data. The conductor gap is created in advance. And comparing the pattern data with the chromatography data, potential conductor clearance check system of claim 1, the gap between the conductor are characterized by the proper or improper or not. 3. A compressed gap data creation unit for creating matrix-type gap data for aggregating net groups of the same gap stored in the conductor gap memory into a new group is additionally installed in the conductor gap data creation apparatus. The potential difference conductor according to claim 2, wherein the compressed gap data is stored in the gap data file, and the new group data is stored in the net group file so as to compress the file capacity. Gap check system. A correction coefficient memory for correcting a conductor gap value according to a difference in a substrate material, a pattern generation method, and the like, and a check condition selection input unit for selectively inputting a check condition of the pattern; When,
3. The potential difference conductor gap check system according to claim 2, further comprising a check condition memory for storing the selected and inputted check condition, and correcting and calculating the conductor gap based on the selected and inputted check condition. 5. The method according to claim 1, wherein the correction count memory is a board material correction table that stores a correction count table determined based on differences in water absorption, surface properties, heat resistance, and the like of a printed circuit board material selected for design. The system for checking a potential difference conductor gap according to claim 4. 6. The pattern forming method correction table according to claim 4, wherein said correction counting memory is a pattern forming method correction table storing a correction counting table determined by a difference in a pattern selection method of a printed circuit board whose design is selected. 2. A potential difference conductor gap check system according to item 1. 7. The use environment correction table according to claim 4, wherein the correction count memory is a use environment correction table that stores a correction count table determined according to a difference in use environment of the manufactured printed circuit board. Potential difference gap checking system. 8. The correction count memory according to claim 4, wherein said correction count memory is a signal waveform correction table storing a correction count table determined by a difference in signal waveform superimposed on a circuit-designed net. 2. A potential difference conductor gap check system according to item 1. 9. The pattern shape correction table according to claim 4, wherein said correction count memory is a pattern shape correction table storing a correction count table determined by a difference in pattern shape designed on a substrate. Potential difference gap checking system. 10. The potential difference according to claim 4, wherein the correction counting memory is an application portion correction table storing a correction counting table determined according to the purpose of use of the designed circuit. Conductor gap check system. 11. The correction count memory according to claim 1, wherein said substrate material correction table, said pattern forming method correction table, said use environment correction table, said signal waveform correction table, or said pattern shape correction table or a plurality of correction tables. The potential difference conductor gap check system according to claim 4, wherein the system is configured in combination. 12. A special operation table for a conductor gap for a special use such as an ultra-high frequency circuit or a spark gap for a high voltage discharge is additionally installed in the conductor gap data creating device, and a special operation table for the conductor gap for the special use is provided. 3. The potential difference conductor gap check system according to claim 2, wherein the conductor gap is calculated using the special calculation table. 13. A pattern gap determining unit for judging and outputting a partial pattern shape during board design based on the pattern data from the pattern input unit is additionally provided in the conductor gap data creating apparatus. 10. The potential difference conductor gap check system according to claim 9, wherein, when checking, the conductor gap data is calculated using a correction coefficient of the pattern shape correction table. 14. A check net display control unit for changing the color of a net during a pattern gap check and performing display control such as adding a special symbol is additionally installed on the display unit of the board design system in the conductor gap data creating apparatus. The potential difference conductor gap check system according to claim 2, wherein: 15. An unsuitable portion display control unit for changing the color of the unsuitable portion and performing display control such as adding a special symbol is additionally installed on the display unit of the board design system in the conductor gap data creating device. 3. The system according to claim 2, wherein the gap is checked. 16. The potential difference according to claim 2, wherein the pattern data input unit, the pattern shape determination unit, the pattern gap determination unit, the check display control unit, and the like are integrally provided in the board design system. Conductor gap check system.