JP5104267B2 - Voltage distribution detection device and voltage distribution detection method - Google Patents

Description

  The present invention is a voltage distribution detection capable of detecting a voltage distribution by each net of a designed circuit in constructing a circuit using an electrical signal such as an electronic circuit, a power circuit, or a wire harness (hereinafter simply referred to as a circuit). The present invention relates to a device and a voltage distribution detection method.

A conventional CAD system for an electronic circuit board includes a wiring unit on a conductor layer layer corresponding to one of the two wiring conductor layers adjacent to each other with a dielectric layer interposed therebetween, and the other corresponding wiring conductor. Forbidden wiring determination processing to detect a wiring unit pair that is close to the wiring unit on the layer layer in parallel and less than a certain distance as a forbidden wiring state, and to eliminate the forbidden wiring state detected thereby, forbidden wiring A prohibition elimination process for moving one wiring unit of the wiring unit pair in a state to a position where the prohibition wiring state is eliminated can be executed (see, for example, Patent Document 1).
JP-A-2005-190210

  Here, problems with circuit design using a conventional CAD system for electronic circuit boards and the like will be described with reference to FIGS. FIG. 9, FIG. 10 and FIG. 11 are explanatory diagrams showing an example of a circuit diagram for explaining problems caused by conventional circuit design. 9 to 11, the DC power source is “DC”, the first switch is “SW1”, the second switch is “SW2”, the first lamp is “Lamp-A”, and the second lamp is "Lamp-B", relay switch "L-SW", relay coil "L-Coil", first diode "D1", second diode "D2" Respectively. In particular, a relay (Ry) is constituted by a relay switch (L-SW) and a relay coil (L-Coil). In addition, “+”, “−”, “1”, “2”, “3”, “4”, “A”, and “B” attached to each component indicate component terminals. . “Net 1”, “Net 2”, “Net 3”, “Net 4”, “Net 5”, “Net 6”, and “Net 7” indicate signal lines connecting the respective terminals, and “GND” indicates a connection. The ground as a point is shown.

  The circuit shown in FIG. 9A is a circuit for switching on / off of a plurality of lamps by a switch. The first lamp is simply turned on (energization between terminals 1 and 2). Neither (Lamp-A) nor the second lamp (Lamp-B) is lit (FIG. 9 (b)), and the contact of the second switch (SW2) is once switched from the terminal A to the terminal B. The second lamp (Lamp-B) is turned on (FIG. 10A), and then the first lamp (Lamp-B) is switched by switching the contact of the second switch (SW2) from the terminal B to the terminal A. A) The circuit is designed to light up. The lighting operation of the first lamp (Lamp-A) and the second lamp (Lamp-B) after the first lamp (Lamp-A) is turned on is the contact of the second switch (SW2). The terminal A and the terminal B are switched. As an example of applying such a circuit, when a headlight (headlight) of an automobile is turned on, a high beam (driving headlight) is not initially turned on by a main switch (turning on the first switch) (low beam). For example, it is set so that the (passing headlight) lights up in the initial stage.

  However, contrary to the intention of the circuit designer, when a prototype is manufactured and the lighting operation is confirmed on the basis of the circuit diagram shown in FIG. 9A, the first switch (SW1) is turned on to turn on FIG. The state shown in b) cannot be maintained, and the first lamp (Lamp-A) is turned on (FIG. 10B).

  As indicated by the thick line in FIG. 11A, after the first switch (SW1) is turned on, the Net1 (DC + terminal → SW1 is changed from the positive (+) terminal of the DC power supply (DC). Terminal 1), first switch (SW1) (terminal 1 → terminal 2), Net2 (terminal 2 of SW1 → terminal 1 of SW2), second switch (SW2) (terminal 1 → terminal A), Net3 (SW2) Terminal A → Lamp-A terminal 1), first lamp (Lamp-A) (terminal 1 → terminal 2), Net5 (Lamp-A terminal 2 → Lamp-B terminal 1), second lamp (Lamp-B) (terminal 1 → terminal 2), Net4 (terminal 2 of Lamp-B → terminal 1 of D2), second diode (D2) (terminal 1 → terminal 2), Net7 (terminal 2 of D2 → L-Coil terminal 2), relay coil (L-Coil) ( Child 2 → terminal 1), forming a closed circuit ground (GND) (pin 1 → GND of L-Coil).

  11B, the relay switch (L-SW) is actuated by the electromagnetic induction action of the relay coil (L-Coil), and the relay switch (L-SW) is closed. Thus, from the positive (+) terminal of the DC power supply (DC), Net1 (DC + terminal → SW1 terminal 1), first switch (SW1) (terminal 1 → terminal 2), Net2 (terminal 2 of SW1). → SW2 terminal 1), second switch (SW2) (terminal 1 → terminal A), Net3 (SW2 terminal A → Lamp-A terminal 1), first lamp (Lamp-A) (terminal 1 → Terminal 2), Net5 (Lamp-A terminal 2 → L-SW terminal 1), relay switch (L-SW) (terminal 1 → terminal 2), ground (GND) (L-SW terminal 2 → GND) This is to form a closed circuit) First lamp (Lamp-A) is the is turned.

  In this way, circuit designers are considering connection between a plurality of components in consideration of the path of current flow (hereinafter referred to as current path) in order to make the designed circuit perform the expected operation. An unexpected current path (hereinafter referred to as wraparound) that is not intended by the circuit designer is not expected by the circuit designer and is often overlooked during the inspection.

  In particular, in a circuit design using a conventional CAD system for an electronic circuit board or the like, it is necessary for a circuit designer to visually check a design drawing in order to verify the presence or absence of the circuit around the designed circuit. .

  For this reason, it is difficult for circuit designers to visually confirm the operation of complex circuits without omissions, and even simple circuits are subject to verification without considering the current generated inside the component. There are many problems that have not been verified.

  Although it is conceivable to use an existing circuit simulator as a means for confirming the signal and current in the designed circuit, it takes a lot of time to analyze the operation of the entire complex circuit. In addition to extracting and analyzing a part of a circuit (partial circuit) and determining the component constants in many cases, in addition to the circuit, an analysis model for the component is also prepared for the simulation. There was a problem that it was necessary to do.

  In particular, in general circuit simulators, the purpose is to confirm the waveform of the output signal with respect to the input signal, and the main focus is on confirming the waveform of the output signal of the part that the circuit designer has focused on (intended). Therefore, it does not confirm whether or not current flows in an unintended portion, and it cannot be detected that current is generated in a portion other than the portion assumed by the circuit designer. For this reason, in order to sufficiently verify the presence or absence of wraparound in the designed circuit, it is necessary to check the analysis results for all signals or waveforms at the terminals without fail, and to check visually. There was a problem that it was necessary.

  The present invention has been made in order to solve the above-described problems. In the designed circuit, it is possible to easily check the unintended wraparound by the circuit designer. The present invention provides a voltage distribution detection device and a voltage distribution detection method capable of preventing design errors that lead to unintended circuit operation and circuit destruction.

The voltage distribution detection method, the component information calculating means comprises a voltage distribution detecting device, the first component identification information that identifies a part of the circuit for detecting the voltage distribution by the Internet, in the part inside the energization Energization source terminal identification information which is information for identifying a terminal which is an energization source, energization destination terminal identification information which is information for identifying a terminal which is an energization destination in energization inside the component, and an energization source terminal due to energization inside the component A component information table creation step for creating a component information table in which current ratio information, which is information on a rate of change in voltage at a current destination terminal with respect to each other, and a circuit information calculation means included in the voltage distribution detection device are components of the target circuit the second component identification information that identifies a terminal identification information is information for identifying the parts of the terminal, and the net to which the terminal is connected Creates a circuit information table having a set voltage storage area for storing voltages set for a series of identification information groups associated with the connection destination identification information, which is information for identifying ground. and the circuit information table generating step of, circuit information calculating means, and the circuit information calculation step of setting the set voltage storage area of the circuit information table and calculate the voltage based on the information of the part information table, and the circuit information table, voltage distribution comprising control means for detecting device comprises, based on the circuit information table set voltage, respectively for a series of identification information group by the circuit information calculation step, and outputting the result of setting of the voltage, the circuit information calculation step The circuit information calculation means is based on the instruction information which is information on the terminal or connection destination of the instructed component. Using the combination of the second component identification information of the designated component and the terminal identification information or connection destination identification information of the instructed component as a search key, and acquiring the connection destination identification information of the matching row in the circuit information table; A first step of setting an initial value of a voltage in a set voltage storage area of a matching row in the circuit information table, and the connection information based on the connection destination identification information acquired by the circuit information calculation means in the first step; A second step of searching for a row of the circuit information table, which is the same connection destination identification information as the destination identification information, and acquiring a voltage set in the set voltage storage area of the row including the same connection destination identification information; The circuit information calculation means determines whether or not the set voltage value, which is the voltage set in the first step, is larger than the voltage set in the set voltage storage area acquired in the second step. When the third step and the circuit information calculation means determine that the set voltage value set in the first step is larger than the voltage set in the set voltage storage area acquired in the second step, the set voltage When the same voltage as the value is set in the set voltage storage area and it is determined that the set voltage value set in the first step is not larger than the voltage set in the set voltage storage area acquired in the second step , the voltage distribution detecting method characterized by comprising a fourth step that does not change the voltage set on the setting voltage storage region.

This voltage distribution detection method can detect the voltage distribution of each net of the designed circuit, so that it is possible to easily check unintentional wraparound. There is an effect that it is possible to prevent a design error leading to unintended circuit operation or circuit destruction.

  Here, the present invention can be implemented in many different forms. Therefore, it should not be interpreted only by the description of the following embodiment. In the following embodiment, the system will be mainly described. However, as will be apparent to those skilled in the art, the present invention can also be implemented as a program and method usable on a computer. In addition, the present invention can be implemented in hardware, software, or software and hardware embodiments. The program can be recorded on any computer-readable medium such as a hard disk, CD-ROM, DVD-ROM, optical storage device, or magnetic storage device. Furthermore, the program can be recorded on another computer via a network.

(First embodiment of the present invention)
1 is a block diagram showing a schematic configuration of a voltage distribution detection system according to the present embodiment, FIG. 2 is an explanatory diagram for explaining an example of a component information table according to the present embodiment, and FIG. 3 is a circuit according to the present embodiment. 4 is an explanatory diagram for explaining an example of the information table, FIG. 4 is a flowchart showing a processing procedure by the voltage distribution detection system shown in FIG. 1, and FIG. 5 shows a state where initial values of voltages are set in the circuit information table shown in FIG. FIG. 6 is an explanatory diagram showing a state where the calculated voltage is set in the circuit information table shown in FIG. 5, and FIG. 7 is an explanatory diagram showing a state where the calculated voltage is set in the circuit information table shown in FIG. FIG. 8 is an explanatory diagram showing an example of a state in which the voltage distribution by each net is displayed on the target circuit diagram.

  In FIG. 1, component information 20 is information indicating the attribute of a general-purpose component, and at least identifies a component with respect to a component used for a circuit that is a voltage distribution detection target (hereinafter referred to as a target circuit). Component identification information that is information, energization source terminal identification information that is information for identifying a terminal (hereinafter referred to as energization source terminal) that is energized in energization within the component, and a terminal that is energization destination in energization within the component (hereinafter referred to as energization source terminal) Current-carrying terminal identification information, which is information for identifying a current-carrying destination terminal), and a current-carrying ratio, which is information on the rate of change (attenuation factor, amplification factor) of the voltage at the current-carrying terminal with respect to the current-carrying source terminal due to the current flowing inside Consists of information. Note that the component information 20 in the first embodiment is a table in which the relationship between terminals (the presence / absence of energization, the energization ratio, etc.) between the components in each component is digitized and tabulated for the components used in the target circuit. Saved as a part information library.

The circuit information 30 is information relating to the constituent elements of the target circuit created by a CAD (Computer Aided Design) system or the like, and at least component identification information that is information for identifying a component of the target circuit, and information for identifying a terminal of the component Terminal identification information, and connection destination identification information that is information for identifying a net or ground to which the terminal is connected. Note that the circuit information 30 may be netlist or parts table data, which is connection information data between terminals.
The input device 40 is a mouse, a keyboard, or the like, and is an input means for instructing a terminal of a component or a connection destination that is a starting point in voltage distribution detection processing described later.

  The output device 50 is a display, a printer, or the like, and is an output means for outputting a detection result in a voltage distribution detection process described later. In the first embodiment, a display is used as the output device 50. However, the output device 50 is not limited to the display.

  The voltage distribution detection device 10 receives the component information 20, the circuit information 30, and the instruction information from the input device 40, detects the voltage distribution by each net for the target circuit, and outputs the detection result to the output device 50.

  The component information calculation means 1 specifies a component used in the target circuit based on the read circuit information 30 and is a first component that is information for identifying the component of the target circuit based on the read component information 20. Identification information, energization source terminal identification information that is information for identifying a terminal that is an energization source in energization within the component, energization destination terminal identification information that is information for identifying a terminal that is an energization destination in energization within the component, and The component information table 2a in which the energization ratio information, which is information on the rate of change in voltage at the energization destination terminal with respect to the energization source terminal due to energization inside the component, is associated with each energization source terminal and energization destination terminal of the component in the memory. It is created on a certain storage means 2.

  In the component information table 2a, each identification information and energization ratio information are associated with the circuit shown in FIG. 9A, for example, as shown in FIG. That is, when the component is a DC power source, there are two terminals of the DC power source, and there are two combinations depending on the energization source terminal and the energization destination terminal. Is associated with energization source terminal identification information “−”, energization destination terminal identification information “+”, and energization ratio information “1.00”, respectively, and the first part identification information “DC” in the second row. Is associated with energization source terminal identification information “+”, energization destination terminal identification information “−”, and energization ratio information “0.00”. Similarly, other parts are also associated with each other in a plurality of rows according to the number of energization source terminals and energization destination terminals.

  Based on the read circuit information 30, the circuit information calculation means 3 includes second component identification information that is information for identifying a component of the target circuit, terminal identification information that is information for identifying a terminal of the component, and the terminal Connection destination identification information, which is information for identifying a net or ground to be connected, is associated with each terminal of the component, and a series of identification information groups associated with each other (in the table shown in FIG. For example, a circuit information table 2b having a set voltage storage area for storing a set voltage is created on the storage means 2 as a memory.

  In the circuit information table 2b, the identification information and the set voltage storage area are associated with the circuit shown in FIG. 9A, for example, as shown in FIG. That is, when the component is a DC power supply, since the terminal of the DC power supply has two terminals, the terminal identification information “−” and the connection destination identification information are associated with the second component identification information “DC” in the first row. “GND” is associated with an unset setting voltage storage area, and terminal identification information “+”, connection destination identification information “Net1”, unset is associated with second component identification information “DC” in the second row. The set voltage storage area of the setting is associated. Similarly, other components are associated with each other in a plurality of rows in accordance with the number of terminals of the component.

In addition, the circuit information calculation means 3 performs unset setting of the circuit information table 2b based on each identification information and energization ratio information in the component information table 2a and each identification information in the circuit information table 2b by a voltage distribution detection process described later. Calculate and set the voltage in the voltage storage area.
The control unit 4 outputs the voltage setting result to the output device 50 based on the circuit information table 2b in which the voltage is set for each of the series of identification information groups by the circuit information calculation unit 3.

  The voltage setting result may be output as a table as shown in FIG. 7B, but is set in the circuit information table 2b for each net of the circuit displayed by the display as the output device. Depending on the value of the voltage, it is preferable to display in stages by changing the color, line width, line type, or combination thereof, so that the presence or absence of wraparound can be easily recognized.

  Next, a processing procedure by the voltage distribution detection system according to the present embodiment will be described with reference to FIG. In order to simplify the description, the circuit shown in FIG. 9A will be described as a target circuit.

First, the operator of the voltage distribution detection system designates the target circuit using the mouse or keyboard that is the input device 40 (step S1).
The circuit information calculation means 3 reads the circuit data of the circuit information 30 based on the instruction information of the target circuit, and creates a circuit information table 2b (see FIG. 3) on the storage means 2 (step S2).

Further, the component information calculation unit 1 reads the component information 20 which is a component information library, and creates a component information table 2a (see FIG. 2) on the storage unit 2 (step S3).
Then, the operator of the voltage distribution detection system performs a CAD operation (a circuit using a mouse) on an arbitrary component terminal or signal line as a starting point (assuming a current change) in the target circuit displayed on the display which is the output device 50. The selection of the graphic), the terminal identification information or the connection destination identification information is input using the keyboard. In the following description, the case where the terminal 2 of the first switch (SW1) is the starting point will be described.

  The circuit information calculation means 3 uses the combination of the corresponding second component identification information and terminal identification information or connection destination identification information as a search key, based on the instruction information of the component terminal or signal line that is the starting point. Connection destination identification information (here, Net2) of the matching line (here, the fourth line) is acquired (step S4).

  Further, the circuit information calculation means 3 uses the combination of the corresponding second component identification information and terminal identification information or connection destination identification information as a search key based on the instruction information of the component terminal or signal line that is the starting point. An initial voltage value (here, 1.00) is set in the set voltage storage area of the matching row (here, the fourth row) in the table 2b (see FIG. 5A, step S5).

  Next, the circuit information calculation means 3 is connected to the target connection destination identification information (here, the connection destination identification information acquired in step S4) based on the connection destination identification information acquired in step 4 or step S14 (to be described later). Here, the row of the circuit information table 2b, which is the same connection destination identification information as Net2), is searched and set in the set voltage storage area of the row (here, the fifth row) containing the same connection destination identification information. Voltage (here, 0.00 because it is not set) is acquired (step S6).

  The circuit information calculation means 3 is a voltage set in step 5 or calculated in step S13 (to be described later) to be applied to the set voltage storage area of the row (here, the fifth row) containing the same connection destination identification information. Hereinafter, it is determined whether or not the set voltage value is larger than the voltage already set in the corresponding set voltage storage area (step S7).

  If it is determined in step S7 that the set voltage value is greater than the voltage already set in the set voltage storage area, the circuit information calculation unit 3 uses the same voltage (here, 1.00) as the set voltage value. Is updated to the corresponding set voltage storage area of the circuit information table 2b (is set if not set) (see FIG. 5B, step S8).

  In addition, when there are a plurality of rows of the circuit information table 2b that is the same connection destination identification information as the connection destination identification information acquired in step 4 or step S14 described later, for all target rows, Steps S6 to S8 are performed.

  If it is determined in step S7 that the set voltage value is not greater than the voltage already set in the set voltage storage area, the process proceeds to step S9 described later without performing the process in step S8.

Next, the circuit information calculation means 3 obtains the second component identification information (here, the fifth row) from the information of the row (here, the fifth row) of the circuit information table 2b whose voltage has been updated (set) in step S8. SW2) and terminal identification information (here, 1) are acquired (step S9).
Then, the circuit information calculation unit 3 determines whether or not there is a target for updating (setting) the voltage set value in the set voltage storage area of the circuit information table 2b (step S10).

  If it is determined in step S10 that there is a target for updating (setting) the voltage setting value in the setting voltage storage area of the circuit information table 2b, the circuit information calculation unit 3 obtains the two pieces of identification information acquired in step S9. (In the component information table 2a, corresponding to the first component identification information and the energization source identification information) is used as a search key, and the energization destination terminal identification information is retrieved from the component information table 2a on condition that the energization ratio information is greater than 0. (Step S11).

  The circuit information calculation means 3 determines whether or not the corresponding energization destination terminal identification information exists from the result of searching for the energization destination terminal identification information in Step S11 (Step S12).

  If it is determined in step S12 that the corresponding energization destination terminal identification information does not exist, the process returns to step S9.

  When it is determined in step S12 that the corresponding energization destination terminal identification information exists, the circuit information calculation unit 3 determines that the corresponding energization destination terminal identification information (here, the fifth row of the component information table 2a). Second component identification information and terminal identification information that match the first component identification information (here, SW2) and the conduction source terminal identification information (here, 1) with respect to the energization destination terminal identification information "A") The component information table 2a including the voltage set value (here, 1.00) set in the set voltage storage area of the row (here, the fifth row) of the circuit information table 2b and the corresponding energization destination terminal identification information The voltage to be updated (set) in the set voltage storage area corresponding to the corresponding energization destination terminal identification information by multiplying the energization ratio information (here, 1.00) in the row (here, the fifth row) Setting value (here Is 1.00) (step S13).

  Then, the circuit information calculation unit 3 uses the corresponding energization destination terminal identification information (here, A) and the corresponding first component identification information (here, SW2) as a search key to match the row in the circuit information table 2b. The connection destination identification information (here, Net3) of (here, the sixth line) is acquired (step S14), and the process returns to step S6.

  Then, the processes in steps S6 to S14 are repeated until there is no target for updating (setting) the voltage setting value in the setting voltage storage area of the circuit information table 2b (determination is “No” in step S10).

That is, although it is a part, it will process as follows.
The circuit information calculation unit 3 searches the row of the circuit information table 2b that is the same connection destination identification information as the target connection destination identification information (here, Net3) based on the connection destination identification information acquired in step S14. The voltage (here, 0.00 because it is not set) set in the set voltage storage area of the row (here, the sixth row) including the same connection destination identification information is acquired (step S6).

  The circuit information calculation means 3 is set to the set voltage value (here, 1....) Calculated in step S13 to be given to the set voltage storage area of the row (here, the sixth row) containing the same connection destination identification information. 00) is larger than the voltage already set in the corresponding set voltage storage area (step S7).

  If it is determined in step S7 that the set voltage value is greater than the voltage already set in the set voltage storage area, the circuit information calculation unit 3 uses the same voltage (here, 1.00) as the set voltage value. Is updated (set) in the corresponding set voltage storage area of the circuit information table 2b (see FIG. 6A, step S8).

  Since there are rows (here, the eighth row and the fourteenth row) of the circuit information table 2b, which is the same connection destination identification information as the connection destination identification information acquired in step S14, all of the targets. Steps S6 to S8 are performed for the line No., and the same voltage as the set voltage value (here, 1.00) is set as the set voltage value and updated (set) in the corresponding set voltage storage area of the circuit information table 2b. (See FIG. 6B).

  Next, the circuit information calculation means 3 uses the information of the row (here, the eighth row) of the circuit information table 2b whose voltage has been updated (set) in step S8, to obtain the second component identification information (here, Lamp-A) and terminal identification information (here, 1) are acquired (step S9).

  Then, the circuit information calculation unit 3 determines whether or not there is a target for updating (setting) the voltage set value in the set voltage storage area of the circuit information table 2b (step S10).

  If it is determined in step S10 that there is a target for updating (setting) the voltage setting value in the setting voltage storage area of the circuit information table 2b, the circuit information calculation unit 3 obtains the two pieces of identification information acquired in step S9. (In the component information table 2a, corresponding to the first component identification information and the energization source identification information) is used as a search key, and the energization destination terminal identification information is retrieved from the component information table 2a on condition that the energization ratio information is greater than 0. (Step S11).

  The circuit information calculation means 3 determines whether or not the corresponding energization destination terminal identification information exists from the result of searching for the energization destination terminal identification information in Step S11 (Step S12).

If it is determined in step S12 that the corresponding energization destination terminal identification information does not exist, the process returns to step S9.
When it is determined in step S12 that the corresponding energization destination terminal identification information exists, the circuit information calculation unit 3 determines that the corresponding energization destination terminal identification information (here, the eleventh row of the component information table 2a). Second component identification information and terminal identification information that match the first component identification information (Lamp-A here) and the energization source terminal identification information (here 1) with respect to the energization destination terminal identification information “2”) Component information including the voltage setting value (here, 1.00) set in the setting voltage storage area of the row (here, the eighth row) of the circuit information table 2b including Multiplying the energization ratio information (here, 0.50) in the row (here, the 11th row) of the table 2a to update (set) the set voltage storage area corresponding to the corresponding energization destination terminal identification information. Voltage setting Value (here, 0.50) (step S13).

  Then, the circuit information calculation means 3 uses the corresponding energization destination terminal identification information (here, 2) and the corresponding first component identification information (here, Lamp-A) as a search key to make a match in the circuit information table 2b. Connection destination identification information (here, Net5) of the line to be executed (here, the ninth line) is acquired (step S14), and the process returns to step S6.

  The circuit information calculation unit 3 searches the row of the circuit information table 2b that is the same connection destination identification information as the target connection destination identification information (here, Net5) based on the connection destination identification information acquired in step S14. The voltage (here, 0.00 because it is not set) set in the set voltage storage area of the row (here, the ninth row) including the same connection destination identification information is acquired (step S6).

  The circuit information calculation means 3 is set to the set voltage value (here, 0...) Calculated in step S13 to be applied to the set voltage storage area of the row (here, the ninth row) containing the same connection destination identification information. 50) is greater than the voltage already set in the corresponding set voltage storage area (step S7).

  If it is determined in step S7 that the set voltage value is larger than the voltage already set in the set voltage storage area, the circuit information calculation means 3 uses the same voltage as the set voltage value (here, 0.50). Is updated (set) in the corresponding set voltage storage area of the circuit information table 2b (step S8).

  Since there are rows (here, the 10th row and the 12th row) of the circuit information table 2b, which is the same connection destination identification information as the connection destination identification information acquired in step S14, all of the targets. The process of steps S6 to S8 is performed on this line, and the same voltage as the set voltage value (here, 0.50) is updated as the set voltage value in the corresponding set voltage storage area of the circuit information table 2b ( (Refer to FIG. 7A).

  Thereafter, the same processing procedure is repeated until there is no target for updating (setting) the voltage setting value in the setting voltage storage area of the circuit information table 2b (determination of “No” is made in step S10). A circuit information table 2b as shown in (b) can be obtained.

  In step S10, when it is determined that there is no target for updating (setting) the voltage setting value in the setting voltage storage area of the circuit information table 2b, the control means 4 uses the circuit obtained by the above-described processing procedure. Based on the information table 2b (here, FIG. 7B), a series of second component identification information, terminal identification information, connection destination identification information, and voltage setting value are sequentially obtained and displayed on a display which is the output device 50. Each net of the target circuit designed in the CAD system is displayed in stages according to changes in color, line width, line type, or combination thereof according to the voltage setting value set in the circuit information table 2b. (Step S15).

  In addition, as an example displayed on the display, for example, with respect to blanks, 0.20, 0.25, 0.50, and 1.00, which are voltage setting values in the setting voltage storage area in FIG. It is conceivable to display a circuit diagram as shown in FIG. 8 in which the line width of the wiring in the circuit diagram is increased as the voltage setting value is increased.

  Here, when the result of the voltage distribution by each net in the target circuit shown in FIG. 8 is verified, current flows through both terminals (terminal 1 and terminal 2) of the relay coil (L-Coil). It can be seen that the contact of the switch (L-SW) may be closed.

  That is, when the contact of the relay switch (L-SW) is closed, a current path from the first lamp (Lamp-A) to the ground (GND) is formed, and the first lamp (Lamp-A) is formed. Will light up.

  Therefore, the function that the circuit designer intended, “the first lamp (Lamp-A) is not turned on in the initial state” cannot be realized in the target circuit, and it is expected that a malfunction as a circuit will occur. .

  As described above, in the circuit design, by applying the numerical value of the energization ratio inside the component, it is possible to detect the voltage distribution by each net when an initial voltage value is given to a specific terminal or signal line. In both cases, according to the voltage setting value set in the circuit information table 2b, the voltage distribution, or the current path, is made obvious by displaying in stages by changing the color, line width, line type or combination thereof, The judgment material for confirming the electric current (around) which the designer does not assume can be provided.

  In particular, based on the detection result of the voltage distribution by each net, the influence range in the circuit due to the voltage change of the specific signal can be determined, and if the voltage change occurs beyond the expected range, detailed examination should be performed It is possible to prompt the circuit designer.

  In addition, in order to obtain these results, it is not necessary to perform complicated preparations such as simulation, and it is possible to easily check the wraparound, so that detection can be performed without imposing a load on the computer, and the entire circuit diagram can be obtained. Can be confirmed.

  In the first embodiment, the voltage is calculated for each net (component terminal) of the target circuit, and the voltage distribution by each net is displayed on the display, so that the wraparound is confirmed. The wraparound may be confirmed by calculating the current distribution from the component terminal of the target circuit to the ground and displaying the current path on the display. In this case, instead of the energization source identification information and the energization destination identification information in the component information table, information based on the branch point of each net is required.

[Appendix] The following appendices are further disclosed with respect to the embodiment including Example 1 described above.
(Additional remark 1) In the voltage distribution detection apparatus for detecting the voltage distribution by each said net | network with respect to the target circuit which consists of the component as a some circuit element and the net which connects between the terminals of the said component, the component of the said target circuit Component identification information, which is information for identifying the current, source identification information for identifying the terminal that is the energization source for energization inside the component, and information for identifying the terminal that is the energization destination for energization in the component A component information calculation means for creating a component information table that associates the energization destination terminal identification information and the energization ratio information that is information on the voltage change rate at the energization destination terminal with respect to the energization source terminal by energization inside the component; Component identification information, terminal identification information that is information for identifying the terminal of the component, and information for identifying a net or ground to which the terminal is connected And creating a circuit information table having a set voltage storage area for storing voltages set for a series of identification information groups associated with each other. A circuit information calculation means for calculating a voltage based on each information of the table and the circuit information table and setting the voltage in a set voltage storage area of the circuit information table; and a voltage for the series of identification information groups by the circuit information calculation means. A voltage distribution detection apparatus comprising: control means for outputting a voltage setting result based on each set circuit information table.

(Supplementary Note 2) A series of identifications in which the circuit information calculation means includes the terminal identification information of the designated terminal or the connection destination identification information of the connection destination based on the instruction information which is information on the terminal or connection destination of the designated component An initial value is set as a voltage associated with the information group in a set voltage storage area of the circuit information table, a voltage is calculated based on each information of the circuit information table and the component information table including the instruction information and the initial value, A voltage distribution detection device, wherein the voltage distribution detection device is set in a set voltage storage area of a circuit information table.

(Supplementary Note 3) The control means determines each net of the target circuit displayed on the display by changing a color, a line width, a line type, or a combination thereof according to a voltage value set in the circuit information table. Voltage distribution detection apparatus characterized by displaying the image automatically.

(Additional remark 4) In the voltage distribution detection method for detecting the voltage distribution by each said net | network with respect to the object circuit which consists of the component as a some circuit element and the net which connects between the terminals of the said component, the component of the said target circuit Component identification information, which is information for identifying the current, source identification information for identifying the terminal that is the energization source for energization inside the component, and information for identifying the terminal that is the energization destination for energization in the component A component information table creation step for creating a component information table in which the current-carrying terminal identification information and the current-carrying ratio information, which is information on the rate of change in voltage at the current-carrying terminal with respect to the current-carrying source terminal due to the current flowing inside the component, The component identification information, terminal identification information that is information for identifying a terminal of the component, and a net or ground to which the terminal is connected Circuit information for associating connection destination identification information, which is identification information, and creating a circuit information table having a set voltage storage area for storing a voltage set for the series of identification information groups associated with each other A table creation step, a circuit information calculation step for calculating a voltage based on each piece of information in the component information table and the circuit information table and setting the voltage in a set voltage storage area of the circuit information table, and the circuit information calculation step. A voltage distribution detection method comprising: an output step for outputting a voltage setting result based on a circuit information table in which a voltage is set for each identification information group.

(Supplementary Note 5) A series of identifications in which the circuit information calculation step includes the terminal identification information of the instructed terminal or the connection destination identification information of the connection destination based on the instruction information which is information on the terminal or connection destination of the instructed component. A first step of setting an initial value as a voltage associated with the information group in a set voltage storage area of the circuit information table, and a voltage based on each information of the component information table of the circuit information table including the instruction information and the initial value And a second step of calculating and setting a set voltage storage area of the circuit information table.

(Supplementary Note 6) The output step is stepwise by changing each net of the circuit displayed on the display according to a change in color, line width, line type, or combination thereof according to the voltage value set in the circuit information table. A voltage distribution detection method, characterized in that the voltage distribution is displayed.

It is a block diagram which shows schematic structure of the voltage distribution detection system which concerns on this embodiment. It is explanatory drawing for demonstrating an example of the components information table which concerns on this embodiment. It is explanatory drawing for demonstrating an example of the circuit information table which concerns on this embodiment. It is a flowchart which shows the process sequence by the voltage distribution detection system shown in FIG. It is explanatory drawing which shows the state which set the initial value of the voltage to the circuit information table shown in FIG. It is explanatory drawing which shows the state which set the calculated voltage to the circuit information table shown in FIG. It is explanatory drawing which shows the state which set the calculated voltage to the circuit information table shown in FIG. It is explanatory drawing which showed an example of the state which displayed the voltage distribution by each net | network on a target circuit diagram. It is explanatory drawing which showed an example of the circuit diagram for demonstrating the problem by the conventional circuit design. It is explanatory drawing which showed an example of the circuit diagram for demonstrating the problem by the conventional circuit design. It is explanatory drawing which showed an example of the circuit diagram for demonstrating the problem by the conventional circuit design.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Component information calculating means 2 Storage means 2a Parts information table 2b Circuit information table 3 Circuit information calculating means 4 Control means 10 Voltage distribution detection apparatus 20 Component information 30 Circuit information 40 Input apparatus 50 Output apparatus

Claims (3)

In a voltage distribution detection method executed by a voltage distribution detection device for detecting a voltage distribution by each net with respect to a target circuit including a component as a plurality of circuit elements and a net connecting between terminals of the component,
Wherein the component information calculating means for voltage distribution detecting device comprises said first component identification information that identifies a part of the circuit, current source is information for identifying the terminal which is energized source in the part inside the energization Terminal identification information, energization destination terminal identification information that is information for identifying a terminal that is an energization destination in energization inside the component, and information on a rate of change in voltage at the energization destination terminal with respect to the energization source terminal due to energization in the component A component information table creation step for creating a component information table in which the energization ratio information is associated with each other;
The circuit information calculation means included in the voltage distribution detection device includes second component identification information that is information for identifying a component of the target circuit , terminal identification information that is information for identifying a terminal of the component, and the terminal is connected. Circuit information table having set voltage storage areas for associating connection destination identification information, which is information for identifying a net or ground to be associated, and storing voltages set for the series of identification information groups associated with each other Circuit information table creation step for creating
Said circuit information calculating means, and the circuit information calculation step of setting the set voltage storage area of the circuit information table to calculate the voltage based on the information of the part information table, and the circuit information table,
An output step for outputting a voltage setting result based on a circuit information table in which a voltage is set for each of the series of identification information groups by the circuit information calculation step , the control means included in the voltage distribution detection device ;
Including
The circuit information calculation step includes:
Based on the instruction information which is information on the terminal or connection destination of the instructed component, the circuit information calculation means is configured to provide the second component identification information of the instructed component and the terminal identification information of the instructed component. Alternatively, using the combination with the connection destination identification information as a search key, the connection destination identification information of the matching row in the circuit information table is acquired, and an initial voltage is stored in the set voltage storage area of the matching row in the circuit information table. A first step of setting a value;
The circuit information calculation means searches the row of the circuit information table that is the same connection destination identification information as the connection destination identification information based on the connection destination identification information acquired in the first step, and the same A second step of obtaining a voltage set in the set voltage storage area in a row including the connection destination identification information of
The circuit information calculation means determines whether a set voltage value, which is a voltage set in the first step, is larger than a voltage set in the set voltage storage area acquired in the second step. 3 steps,
When the circuit information calculation means determines that the set voltage value set in the first step is larger than the voltage set in the set voltage storage area acquired in the second step, the set voltage value Is set in the set voltage storage area, and the set voltage value set in the first step is determined not to be larger than the voltage set in the set voltage storage area acquired in the second step. A fourth step in which the voltage set in the set voltage storage area is not changed,
Voltage distribution detection method, which comprises a. In the voltage distribution detection method according to claim 1,
The circuit information calculation step includes:
A fifth step in which the circuit information calculation means acquires the second component identification information and the terminal identification information from the information in the row of the circuit information table in which the voltage is set in the fourth step;
A sixth step in which the circuit information calculation means determines whether or not there is a target to set the voltage set value in a set voltage storage area of the circuit information table;
When the circuit information calculation means determines that there is an object to set the voltage setting value in the set voltage storage area of the circuit information table, the second circuit information table acquired in the fifth step The first component identification information and the energization source identification information of the component information table corresponding to the component identification information and the terminal identification information are used as search keys, and the energization ratio information is greater than 0 from the component information table. A seventh step that proceeds to the output step when searching for energization destination terminal identification information and determining that there is no target to set the voltage set value in the set voltage storage area of the circuit information table;
An eighth step in which the circuit information calculation means determines whether or not the corresponding energization destination terminal identification information exists from the result of searching the energization destination terminal identification information in the seventh step;
When the circuit information calculation means determines that the corresponding energization destination terminal identification information exists in the eighth step, the first component identification information and the energization source terminal identification information for the corresponding energization destination terminal identification information The voltage setting value set in the set voltage storage area of the row of the circuit information table including the second component identification information and terminal identification information, and the corresponding energization destination terminal identification information Multiplying the energization ratio information in the row of the component information table to calculate the voltage setting value to be set in the set voltage storage area corresponding to the corresponding energization destination terminal identification information, and to the eighth step And when it is determined that there is no applicable energization destination terminal identification information, a ninth step that returns to the fifth step;
The circuit information calculation means obtains connection destination identification information of a matching row in the circuit information table using the corresponding energization destination terminal identification information and the corresponding first component identification information as a search key, and the second step A tenth step back to
Only including,
In the second step, when returning from the tenth step to the second step, the circuit information calculation means determines the connection destination based on the connection destination identification information acquired in the tenth step. Searching a row of the circuit information table that is the same connection destination identification information as the identification information, and obtaining a voltage set in the set voltage storage area of the row including the same connection destination identification information. A characteristic voltage distribution detection method. In the voltage distribution detection method according to claim 1 or 2,
The output step executed by the control means is performed by changing each net of the circuit displayed on the display according to a voltage value set in the circuit information table, a change in color, line width, line type, or a combination thereof. A voltage distribution detection method characterized by displaying in stages.

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