JPH04199470A - Circuit design device - Google Patents

Abstract

PURPOSE:To shorten the time needed for checking and to prevent the checking mistake by instructing to inspect the element value from the indication means and automatically deciding whether the element value inputted from the input means coincides with the standard value stored in the standard value table or not. CONSTITUTION:When the inspection is instructed from an input part 1, an inspection object setting picture 9 is displayed on a display 7 by the processing part. In this case, whether the specified kind of elements exist within the extent of the inspection or not is decided by searching a work memory 5. If the elements exist, they are taken out one by one and whether it has the value for the specified attribute name or not is decided. If it has the value, whether the value coincides with the value in the system of the specified E standard number or not is decided by referring to an E standard number table 4. As for the error display, if the object element is blinked on the display 7 by a display control part 8 and the element value according to this error display is corrected, the circuit diagram is completed. Thus, the working time for the inspection can be shortened and the inspection mistakes can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a circuit design device such as a CAD device for designing a circuit diagram.

(b) Conventional technology In general, circuit design devices store pictures of various elements such as resistors and capacitors used to create circuit diagrams in a symbol library, and when designing, a desired element can be selected from this library. Read the pattern and display it on the screen.

Then, while looking at the screen display, input element values such as resistance value and capacitance value, and attributes such as element identification name for the read element using input means such as a keyboard or mouse, and further, The circuit is designed by inputting connection information between multiple elements.

On the other hand, the nominal resistance values of resistors, capacitors, and high-frequency coils,
As the nominal capacitance value and the nominal inductance value, those that meet standard values called E standard numbers (also referred to as E series) are generally widely adopted worldwide.

(c) Problems to be Solved by the Invention As mentioned above, in the circuit design device, the operator manually inputs the element values of resistors and capacitors, so it is possible to accidentally input values that do not match the E standard number, which is the standard value. There is a possibility that you may enter it.

However, with conventional devices, the operator had to visually check whether the input element values matched the standard values, which took time and
There was also a high possibility that a check mistake would occur.

Therefore, an object of the present invention is to shorten the time required for checking and to prevent checking errors.

(d) Means for Solving the Problems The present invention provides a symbol library storing the picture of each element, an input means for inputting an element value for an element read from the library, a storage means for storing design circuit information including the element values; a standard value table storing the standard values of the elements in advance; an instruction means for instructing inspection of the element values; and in response to an instruction from the instruction means, A determining means for reading out the element value input from the input means from the storage means and referring to the standard value table to determine whether or not it matches the standard value, and a notification means for notifying the determination result, It is something that solves problems.

(e) Operation In the present invention, when an instruction to test an element value is given from the instruction means, it is automatically determined whether the element value inputted from the input means matches the standard value stored in the standard value table. A determination is made, and the operator is notified of the determination result.

(F) Embodiment FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, in which 1 is an input section such as a keyboard and a mouse, 2 is a pattern of various elements used in circuit design such as resistors and capacitors, and , a symbol library that stores basic attributes such as element types, 3 a circuit data file that stores designed circuit data, 4 an E standard number table that stores E standard numbers in advance,
5 is a work memory; 6 is a processing unit that executes various processes for circuit design, such as processing input data and reading and writing data from various storage means; 7 is a processor that stores circuit information during and after designing; A display 8 is a display control unit that controls the display.

Here, the symbol library 2, circuit data file 3, and E standard number table 4 are configured by an external storage device such as a magnetic disk.

Also, the E standard number is E12. It has a plurality of series such as E24, and the E standard number table 4 stores all values in these series, as shown in FIG.

Hereinafter, this embodiment will be described in detail with reference to the flowchart of FIG. 1 and the display example of FIG. 4.

The circuit design in this embodiment is basically performed in an interactive manner while looking at the display 7, as in the conventional case.

That is, first, the type of element required and the position to place the element are specified from the input unit 1, and the design and basic attributes of the specified element are stored in the work memory 5 from the symbol library 2 by the processing unit 6. The read pattern is read out and displayed at a designated position on the display 7.

Next, the read connections between the elements and the attributes of each element are input from the input section 1. Attributes include element type ST,
There are element identification name SD, element value C■, etc., and element type ST is added while being stored in symbol library 2, so here, element identification name SD, element value CV
Enter other attributes such as Specifically, plot the picture of the displayed element, and if it is a resistor, 5D=R577
, CV=12,5Ω, or 5D=R580, C
Key in Ω for V=7.5, and also key in capacitor voltage, 5D=C579, CV=22000PF.

Note that the element type ST is 5T=R for a resistor, and 5T=C for a capacitor.

In this way, the input wiring information and attributes are stored in the work memory 5 in the same way as the pattern, and the designed circuit diagram is displayed on the display screen as shown in FIG. 4.

Here, circuit design may be performed by referring to an already created circuit diagram. In this case, first read the desired circuit data from the circuit data file 3 into the work memory 5, and then display it on the display 7. After that, elements can be added, deleted, or corrected by the same operations as described above.

In order to test the elements of the circuit diagram created as described above, a test instruction is given from the input section 1.

When an inspection is instructed, the processing section displays an inspection target setting screen 9 on the display 7, as shown in FIG. 4, according to the flowchart of FIG. In this setting screen,
Element type ST, attribute name AT, E standard number series ES, XY
The inspection range AREA is designated by coordinates, and the processing unit 6 performs the following processing depending on the execution key input after designation.

That is, the work memory 5 is searched to determine whether an element of the specified type exists within the inspection range, and if so, the elements are extracted one by one and whether they have a value for the specified attribute name or not. judge. If it has, check whether its value matches the value of the specified E standard number series.
E Determine by referring to standard number table 4.

More specifically, this determination is made by determining whether or not the value for the specified attribute name is 10 times the nth power of the E standard number of the specified series, and if it is not multiplied by the nth power, it is determined that there is no match. Determine and display the error. Any method may be used to display the error, as long as it notifies the operator of the determination result, such as by causing the display control unit 8 to blink the target element on the display 7 or displaying it with high brightness.

For example, in the circuit diagram shown in FIG.
resistance), attribute name=CV, E standard number series=E24. If specified, R,578, R580 of the four resistors
, R, 581, its resistance value C■ is 10" times the E standard number 1.2 of the E24 series.

This is 104 times higher than 7.5 and 102 times higher than 6.8.

However, R577 has a resistance value Cv of 12.5.
However, it also does not match the E24 series E standard numbers 1°2 and 1.3. Therefore, only R577 will be displayed as an error.

If the element values are corrected according to the error display, the circuit diagram is completed, and when a save instruction is given from the input section 1, the circuit data in the work memory 5 is saved in the circuit data file 3.

(G) Effects of the Invention According to the present invention, input element values such as resistance values and capacitance values can be automatically checked to see if they match standard values.
It becomes possible to significantly shorten the working time for inspection and to reliably prevent inspection errors.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the processing contents of an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the embodiment, FIG. 3 is a diagram showing the contents of the E standard number table in the embodiment, and FIG.
The figure is a diagram showing a display example in the embodiment. (1)...Input section, (2)...Symbol library, (3)...Circuit data file, (
4)...E standard number table, (5)...work memory, (6)...processing section, (7)...
-Display, (8)...display control unit.

Claims (1)

[Claims] (1) A symbol library that stores the pattern of each element, an input means for inputting the element value for the element read from the library, and design circuit information including the element value is stored. a storage means, a standard value table in which standard values of the element are stored in advance, an instruction means for instructing inspection of the element value, and in response to an instruction from the instruction means, the element value inputted from the input means is transmitted to the 1. A circuit design apparatus comprising: a determining means for reading from a storage means and referring to the standard value table to determine whether or not the standard value is met; and a notifying means for notifying the determination result.