Apparatus, method, and device for evaluating and designing an electrical equipment system

Abstract

To provide an evaluation device, a designing device, an evaluation method, and a designing method of an electric equipment system capable of evaluating causes of induction interference among plural wiring parts in advance.SOLUTION: An evaluation device of an electric equipment system includes: a transfer function calculation part for obtaining a transfer function that uses mutual inductance between a first wire and a second wire and sets a predetermined design parameter as a variable; a transfer function limit value calculation part for obtaining a design limit value of a transfer function from design limit values of a signal level of a first current or a first voltage in the first wire, and a signal level of the second wire; an assignment operation part for setting a design value of a design parameter in the electric equipment system and obtaining a value of a transfer function when substituting a variable of the transfer function for the design value; and an evaluation part for evaluating whether a design value is appropriate by comparing a value of a transfer function based on the design value with a design limit value of a transfer function.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an evaluation device, a design device, an evaluation method, and a design method for an electric equipment system. [Background technology]

[0002] When designing a relatively large-scale electrical equipment system such as a railway vehicle, it is necessary to take into consideration the inductive interference that occurs between multiple wiring parts. However, in an electrical equipment system that has multiple electrical systems, it is difficult to evaluate the system when all the electrical systems are installed at the design stage.

[0003] In conventional EMC (electromagnetic compatibility) designs, the noise tolerance of the device receiving induced interference (victim device) is specified by the noise level limit (design limit value of the signal level), so it can only be evaluated based on that noise level, which means that if the noise level limit is exceeded, it is difficult to determine the cause.

[0004] When carrying out such evaluations at the time of design, the following Patent Document 1 discloses that electromagnetic radiation intensity is calculated from the results of measuring the current of a wire harness connected to an on-board device, and the calculated value is used in the on-board design.

[0005] Furthermore, the following Patent Document 2 discloses a method for providing design support for wiring layout on a printed circuit board, in which signal lines affected by crosstalk noise are detected based on detection conditions related to the line-to-line distance or proximity length between multiple signal lines from design information of the printed circuit board. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2002-19547 A [Patent Document 2] JP 2013-117863 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, Patent Document 1 merely treats the wire harness as a noise source and does not take into consideration interference between multiple wirings. Also, the method of Patent Document 2 is intended for a system (such as multiple signal lines on a circuit board) in which there is little error from the actual effects even when verified under ideal conditions, such as short inter-line distances, small differences in signal levels (voltage, etc.) between signal lines, and no metal around the signal lines, and there is room for improvement in evaluating the cause of inductive interference between multiple wiring parts in a wiring layout closer to reality, such as verification between driving power supply wiring (high-voltage wiring) for driving an electric motor and information transmission wiring (low-voltage wiring), and verification when metal is around the signal lines.

[0008] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide an evaluation device, design device, evaluation method, and design method for an electrical equipment system that is capable of evaluating in advance the cause of inductive interference between a plurality of wiring portions. [Means for solving the problem]

[0009] An evaluation device for an electric equipment system according to one aspect of the present invention is an evaluation device for an electric equipment system including a first electric system in which a first device and a second device are electrically connected via a first wiring, and a second electric system in which a third device and a fourth device are electrically connected via a second wiring, the evaluation device determining a transfer function using mutual inductance between the first wiring and the second wiring, the transfer function having a first current or a first voltage in the first wiring as an input, a second current or a second voltage in the second wiring generated by inductive interference between the first wiring and the second wiring based on the first current or the first voltage as an output, and having predetermined design parameters as variables. a transfer function limit value calculation unit that calculates a design limit value of the transfer function in a predetermined frequency range from a signal level in the predetermined frequency range of the first current or the first voltage and a design limit value of the signal level in the frequency range of the second wiring; an assignment calculation unit that sets design values ​​of the design parameters in the electric equipment system and calculates a value of the transfer function in the frequency range when the design values ​​are substituted for the variables of the transfer function; and an evaluation unit that evaluates the acceptability of the design value by comparing the value of the transfer function based on the design value in the frequency range with the design limit value of the transfer function.

[0010] Moreover, a design device according to another aspect of the present invention is a design device for an electrical equipment system including a first electrical system in which a first device and a second device are electrically connected via a first wiring, and a second electrical system in which a third device and a fourth device are electrically connected via a second wiring, the design device including: a transfer function calculation unit that calculates a transfer function using mutual inductance between the first wiring and the second wiring, the transfer function having a first current or a first voltage in the first wiring as an input, a second current or a second voltage in the second wiring generated by inductive interference between the first wiring and the second wiring based on the first current or the first voltage as an output, and having predetermined design parameters as variables; a transfer function limit value calculation unit that calculates a design limit value of the transfer function in a predetermined frequency range from a signal level of the first current or the first voltage in the first frequency range and a design limit value of the signal level of the second wiring in the frequency range; and a design parameter limit value calculation unit that sets a design limit value of the design parameter such that the value of the transfer function based on the design value in the frequency range does not exceed the design limit value of the transfer function.

[0011] Furthermore, an evaluation method according to another aspect of the present invention is a method for evaluating an electric equipment system including a first electric system in which a first device and a second device are electrically connected via a first wiring, and a second electric system in which a third device and a fourth device are electrically connected via a second wiring, the method comprising the steps of: determining a transfer function using mutual inductance between the first wiring and the second wiring, the transfer function having a first current or a first voltage in the first wiring as an input, and a second current or a second voltage in the second wiring generated by inductive interference between the first wiring and the second wiring based on the first current or the first voltage as an output, and having predetermined design parameters as variables; determining a design limit value of the transfer function in a predetermined frequency range from a signal level of the first current or the first voltage in the predetermined frequency range and a design limit value of the signal level in the frequency range of the second wiring; setting design values ​​of the design parameters in the electric equipment system; determining a value of the transfer function in the frequency range when the design value is substituted for the variable of the transfer function; and evaluating the acceptability of the design value by comparing the value of the transfer function based on the design value in the frequency range with the design limit value of the transfer function.

[0012] Furthermore, a design method according to another aspect of the present invention is a design method for an electrical equipment system including a first electrical system in which a first device and a second device are electrically connected via a first wiring, and a second electrical system in which a third device and a fourth device are electrically connected via a second wiring, the design method comprising the steps of: determining a transfer function using mutual inductance between the first wiring and the second wiring, the transfer function having a first current or a first voltage in the first wiring as an input, and a second current or a second voltage in the second wiring generated by inductive interference between the first wiring and the second wiring based on the first current or the first voltage as an output, and having a predetermined design parameter as a variable; determining a design limit value of the transfer function in a predetermined frequency range from a signal level of the first current or the first voltage in the predetermined frequency range and a design limit value of the signal level of the second wiring in the frequency range; and setting a design limit value of the design parameter such that the value of the transfer function in the frequency range does not exceed the design limit value of the transfer function.

[0013] According to the above method and device, the inductive interference between the first electric system and the second electric system can be evaluated based on a transfer function using the mutual inductance between the first wiring and the second wiring. In this case, since the inductive interference can be evaluated for each design parameter set as a variable in the transfer function, if the inductive interference becomes excessive, the cause can be easily grasped. Therefore, according to the above method and device, the cause of the inductive interference between multiple wiring parts can be evaluated in advance. Effect of the Invention

[0014] According to the present invention, the cause of inductive interference between a plurality of wiring portions can be evaluated in advance. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic diagram showing an example of an electrical device system that is the subject of an evaluation method according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a block diagram showing a schematic configuration of an evaluation device according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a flowchart showing the flow of the design parameter evaluation process in this embodiment. [Figure 4] FIG. 4 is a diagram for explaining a method for determining the frequency characteristics of the design limit value of the transfer function in this embodiment. [Diagram 5] FIG. 5 is a graph showing an example of evaluation of design parameters using design limit values ​​of the transfer function in this embodiment. [Figure 6] FIG. 6 is a block diagram showing a schematic configuration of a design apparatus according to a modified example of an embodiment of the present invention. [Figure 7] FIG. 7 is a flowchart showing the flow of the design rule setting process for design parameters in this embodiment. [Figure 8] FIG. 8 is a graph for explaining a setting mode of the design limit values ​​of the design parameters in this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, a method for evaluating an electric equipment system according to an embodiment of the present invention will be described. First, an example of the electric equipment system will be described.

[0017] 1 is a schematic diagram showing an example of an electric equipment system to be subjected to an evaluation method according to an embodiment of the present invention. The electric equipment system 1 includes a plurality of electric wiring systems including a first electric system 10 and a second electric system 20.

[0018] The first electric system 10 includes a first device 11 and a second device 12. The first device 11 and the second device 12 are electrically connected by a first wiring 13.

[0019] The first electric system 10 is configured, for example, as a power supply system for a railway vehicle. For example, the first device 11 is a power supply device, and the second device 12 is a load driven by power supplied from the power supply device and a drive device for the load. The load 14 connected to the first wiring 13 as the second device 12 is, for example, an electric motor. The first device 11 configured as a power supply device for driving the electric motor includes, for example, a current collector from a power supply facility or a high-voltage distribution section.

[0020] At this time, the first wiring 13 is configured as a driving power supply wiring in which the first current I1 is a current for driving the load 14 connected to the second device 12. In this manner, the first electric system 10 is configured as a high-power electric system in which the operating voltage is, for example, several thousand volts to several tens of thousands volts.

[0021] The second electric system 20 includes a third device 21 and a fourth device 22. The third device 21 and the fourth device 22 are electrically connected by a second wiring 23.

[0022] The second electric system 20 is configured, for example, as a signal transmission system for performing communication of railway vehicles or transmission of control signals. For example, the third device 21 is a control device, and the load 24 connected to the second wiring 23 as the fourth device 22 is a control circuit that receives a control signal from the control device. For example, the control circuit includes a switching circuit of an inverter connected to an electric motor (load 14) as a drive device for the electric motor. In this way, the second electric system 20 is configured as a low-current electric system with a working voltage of, for example, several μV to several tens of V.

[0023] In this embodiment, the main purpose is to evaluate interference between wirings when different types of electrical wiring systems including the first electrical system 10 and the second electrical system 20 described above are arranged within a structure such as a railway vehicle.

[0024] (Evaluation device) FIG. 2 is a block diagram showing a schematic configuration of an evaluation device according to an embodiment of the present invention. The evaluation device 31 shown in FIG. 2 includes an input unit 32, a storage unit 33, a calculation unit 34, and an output unit 35. The components 31 to 35 communicate data with each other via a bus 36. The evaluation device 31 may be configured by a design computer for designing the electric device system 1, or may be configured as a computer independent of the design computer. The evaluation device 31 may also be configured by a computer capable of communicating with the design computer. For example, the evaluation device 31 may be a personal computer including a processor, a main memory (RAM), and a storage. The processor may be, for example, a CPU. The storage may be, for example, a hard disk, a flash memory, or the like. The main memory and the storage may be collectively referred to as memory.

[0025] It should be noted that the functions of the elements disclosed herein can be performed using circuits or processing circuits, including general purpose processors, special purpose processors, integrated circuits, Application Specific Integrated Circuits (ASICs), conventional circuits, and / or combinations thereof, configured or programmed to perform the disclosed functions. A processor is considered a processing circuit or circuit because it includes transistors and other circuits. In this specification, a circuit, unit, or means is hardware that performs the recited functions or hardware that is programmed to perform the recited functions. The hardware may be hardware disclosed in this specification or other known hardware that is programmed or configured to perform the recited functions. In the case where the hardware is a processor, which is considered a type of circuit, the circuit, means, or unit is a combination of hardware and software, and the software is used to configure the hardware and / or the processor.

[0026] The input unit 32 is configured as an input device that allows a user to input information such as design parameters, which will be described later. The storage unit 33 stores the information input from the input unit 32. The storage unit 33 also stores in advance design conditions and an evaluation program for the electric device system 1, which will be described later. The design conditions may be set and input or changeable from the input unit 32.

[0027] The calculation unit 34 executes the evaluation process based on various information stored in the storage unit 33. To this end, the calculation unit 34 executes an evaluation program to thereby exhibit the functions of a transfer function calculation unit 41, a transfer function limit value calculation unit 42, a substitution calculation unit 43, an evaluation unit 44, and the like.

[0028] The evaluation device 31 evaluates the acceptability of design parameters for designing the electric equipment system 1 using a transfer function G when a second current I2 flows in the second wiring 23 due to inductive interference between the first wiring 13 and the second wiring 23 based on a first current I1 flowing in the first wiring 13. In this embodiment, the effect of inductive interference caused by a high-voltage electric system (first electric system 10: victim system) on a low-voltage electric system (second electric system 20: victim system) is evaluated when the first current flowing in the first wiring is input and the second current flowing in the second wiring 23 is output.

[0029] The design parameters in this case include at least one of the mutual inductance M, the impedance Z4 of the load 24 connected to the second wiring 23 as the fourth device 22, the internal impedance Z3 of the third device 21, the self-inductance L2 of the second wiring 23, and the signal level of the first current I1. Design parameters to be evaluated are selected from these design parameters, and the following evaluation is performed.

[0030] In this embodiment, a large-scale system such as a railway vehicle or an airplane is assumed. Therefore, assuming that the frequency of the signal source of the first device 11 is a low frequency and that the wiring length of the first wiring 13 and the second wiring 23 is sufficiently shorter than the signal wavelength, the first wiring 13 and the second wiring 23 are not treated as distributed constant circuits. Also, in such a large-scale system, the distance between the wiring parts 13 and 23 is relatively long, and the attenuation of the electric field is large, so that the influence of the magnetic field becomes dominant. For this reason, the parasitic capacitance between the wiring parts 13 and 23 is not taken into consideration (it is not included in the design parameters).

[0031] The design parameters are evaluated within a predetermined frequency range (set frequency range). The set frequency range is stored in advance in the storage unit 33. This frequency range is determined in advance, for example, based on the operating specifications of the second electric system 20 (fourth device 22). By inputting a desired frequency range from the input unit 32, the evaluation may be performed with the frequency range as the set frequency range.

[0032] 3 is a flowchart showing the flow of a design parameter evaluation process in this embodiment. In this example, the design parameter to be evaluated is mutual inductance M, and a method for evaluating the acceptability of a specific design value of the mutual inductance M is illustrated.

[0033] First, the transfer function calculation unit 41 receives as input the first current I1 flowing through the first wiring 13, and calculates a transfer function G having as output the second current I2 flowing through the second wiring 23 due to inductive interference between the first wiring 13 and the second wiring 23 based on the first current I1 (step S1).

[0034] According to Kirchhoff's law, the following relationship holds between the first current I1 and the second current I2.

[0035]

number

[0036] From the above relational expressions, the transfer function G is expressed as follows:

[0037]

number

[0038] In this way, the transfer function G is expressed using the mutual inductance M, the impedance Z4 of the load 24 connected to the second wiring 23 as the fourth device 22, the internal impedance Z3 of the third device 21, and the self-inductance L2 of the second wiring 23. When taking measures against inductive interference, such as covering the wiring parts 13, 23 with a shielding material, a transfer function that takes into account the effect of the measures (for example, a transfer function obtained by multiplying the transfer function obtained by the above formula by a predetermined coefficient) may be used. In this example, in order to evaluate the mutual inductance M, the variable of the transfer function G is set to the mutual inductance M.

[0039] The transfer function limit value calculation unit 42 calculates a design limit value SL2 of the signal level of the current in the second wiring 23 by calculating a signal level SL1 of the first current I1 andL From this, the design limit value k of the transfer function G L (Step S2) The design limit value k of the transfer function G is calculated. L is calculated as a relational value (frequency characteristic) with respect to the frequency f in the set frequency range.

[0040] 4 is a diagram for explaining a method for determining the frequency characteristics of the design limit value of the transfer function in this embodiment. Graph D1 is a graph showing the frequency characteristics of the signal level SL1 of the first current I1. The signal level SL1 of the first current I1 is determined by performing a calculation based on the design value or circuit configuration of the first electric system 10.

[0041] Graph D2 shows the design limit value SL2 of the signal level of the second wiring 23. L 1 is a graph showing the frequency characteristics of the design limit value SL2 L is given in advance based on the specifications of the fourth device 22 (load 24) and the like.

[0042] Graph D3 shows the design limit value k of the transfer function G. L Graph D3 is obtained as the ratio of graph D2 to graph D1 (D3=D2 / D1). That is, the design limit value k L is a design limit value SL2 of the signal level in a predetermined frequency range of the second wiring 23 relative to the signal level SL1 in a predetermined frequency range of the first current I1. L This can be obtained by calculating the ratio of

[0043] In FIG. 4, the signal level SL1 of the first current I1 and the design limit value SL2 of the signal level of the second wiring 23 are L and the design limit value k of the transfer function G L are shown as graphs D1 to D3, respectively, but in actual calculation, the transfer function limit value calculation unit 42 uses a data table including values ​​of the signal level SL1 for each predetermined frequency, which are stored in advance in the storage unit 33, and a design limit value SL2 L The design limit value k of the transfer function G is calculated by reading the data table including the values ​​at each predetermined frequency and calculating the values ​​at the same frequency.L A data table may be generated that includes values ​​for each predetermined frequency in the frequency domain.

[0044] The substitution calculation unit 43 receives an input of a design value of a design parameter (here, mutual inductance M) set in a variable. The mutual inductance M between two wirings arranged in parallel can be calculated, for example, by using the following formula.

[0045]

number

[0046] The mutual inductance M may be found by electromagnetic field analysis instead of the above formula. Furthermore, the value of the mutual inductance M obtained by performing an electromagnetic field analysis while changing element parameters of the mutual inductance M, such as the distance d between the wirings and / or the length l of the wirings, may be stored in the storage unit 33 as a data table that can be referenced from the element parameters, and the value of the mutual inductance M read by referring to the data table stored in the storage unit 33 may be used by inputting the value of the element parameter from the input unit 32. By performing the electromagnetic field analysis, even if a metal is present around the wiring units 13 and 23, it is possible to evaluate the inductive interference taking into account the influence of the metal.

[0047] The substitution calculation unit 43 sets the design values ​​of the design parameters input by the input unit 32 as the design values ​​to be evaluated (step S3). The substitution calculation unit 43 obtains the value k of the transfer function G when the design values ​​are substituted for the variables of the transfer function G (step S4). At this time, fixed values ​​are substituted for the other design parameters. The value k of the transfer function is also obtained as a relational value (frequency characteristic) with respect to the frequency f in the set frequency range. The value k of the transfer function is calculated based on the design limit value k L Similarly, k=k·I1 represents the ratio of the second current I2 to the first current I1.

[0048] The evaluation unit 44 evaluates the value k of the transfer function G based on the design value in the set frequency range and the design limit value k of the transfer function G. L The acceptability of the design value is evaluated by comparing with the actual value (step S5).

[0049] 5 is a graph showing an example of evaluation of design parameters using design limit values ​​of the transfer function in this embodiment. The graph D3 shown in FIG. 5 is the same as the graph D3 shown in FIG. 4, and the design limit value k L Graphs D4 and D5 are graphs showing frequency characteristics of the value k of the transfer function obtained based on the design values ​​of the design parameters.

[0050] The evaluation unit 44 is a set frequency range S f The value k of the transfer function based on the design value is the design limit value k of the transfer function G. L Determine whether the set frequency range S is less than or equal to f The value k of the transfer function based on the design value in the entire range is the design limit value k of the transfer function G. L If it is equal to or less than this, the evaluation unit 44 judges the design value to be good.

[0051] In Fig. 5, the design limit value k L In the actual calculation, the evaluation unit 44 uses a data table including the transfer function value k for each predetermined frequency calculated by the substitution calculation unit 43 and the design limit value k of the transfer function G. L and a data table containing values ​​for each predetermined frequency in order to compare the values ​​at corresponding frequencies.

[0052] In the example of Figure 5, for graph D4, the set frequency range S f The value k of the transfer function based on the design value is the design limit value k of the transfer function G over the entire range. L Therefore, the design value (the value of mutual inductance M) at this time is judged to be good. On the other hand, for graph D5, the set frequency range S fIn some areas, the value k of the transfer function based on the design value is the design limit value k of the transfer function G. L Therefore, the design value (value of mutual inductance M) at this time is determined to be defective. The determination result is output from the output unit 35 (for example, displayed on a display device). In this way, by changing the value (design value) substituted for the variable of the transfer function G and performing re-evaluation, it is possible to evaluate a plurality of design values.

[0053] Furthermore, in this evaluation, it is possible to change the design parameters of the evaluation target. For example, the design parameter set as a variable may be changed from the mutual inductance M to the impedance Z4 of the load 24 connected to the second wiring 23 as the fourth device 22. In this case, as in the case where the mutual inductance M is used as a variable, the value k of the transfer function based on the design value of the impedance Z4 of the load 24 is changed to the design limit value k of the transfer function G. L It can be evaluated by determining whether:

[0054] As described above, according to the evaluation device 31 or the evaluation method of this embodiment, the inductive interference between the first electric system 10 and the second electric system 20 can be evaluated based on the transfer function G using the mutual inductance M between the first wiring 13 and the second wiring 23. At this time, since the inductive interference can be evaluated for each design parameter set as a variable of the transfer function G, when the inductive interference becomes excessive, the cause can be easily grasped. Therefore, according to this embodiment, the cause of the inductive interference between the multiple wiring parts 13, 23 can be evaluated in advance.

[0055] In addition, when there is metal around the wiring parts 13, 23 or when a shielding material is used, the value of mutual inductance M will be smaller than the value under ideal conditions (the value calculated based on the calculation formula). In other words, in such a case, the value of mutual inductance M calculated based on the calculation formula will be larger than the value of mutual inductance M obtained by electromagnetic field analysis, which is closer to actual conditions. In other words, an evaluation using mutual inductance M calculated based on the calculation formula as the design value will be a safer evaluation (stricter evaluation) than an evaluation using mutual inductance M obtained by electromagnetic field analysis as the design value.

[0056] Therefore, by performing an evaluation using the mutual inductance M calculated based on a formula as a primary evaluation, the design values ​​of the design parameters may be roughly filtered, and for design values ​​determined to be defective in the primary evaluation, an evaluation using the mutual inductance M obtained by electromagnetic field analysis may be performed as a secondary evaluation. This makes it possible to perform design value evaluation under conditions closer to reality while reducing the number of times electromagnetic field analysis, which has a high calculation load, is performed.

[0057] (design equipment) In the above embodiment, the evaluation device 31 that evaluates the setting values ​​of the design parameters input from the input unit 32 has been exemplified. However, instead of this, the evaluation device 31 can also be configured as a design device that determines design rules for the design parameters.

[0058] Fig. 6 is a block diagram showing a schematic configuration of a design device according to a modified embodiment of the present invention. The same components as those of the evaluation device 31 shown in Fig. 2 are given the same reference numerals and will not be described. The design device 31B shown in Fig. 6 also includes an input unit 32, a storage unit 33, a calculation unit 34, and an output unit 35, similar to the evaluation device 31 shown in Fig. 2. The components 31 to 35 communicate data with each other via a bus 36.

[0059] The calculation unit 34 executes the design support program stored in the memory unit 33, thereby exerting functions of a design parameter limit value calculation unit 45 and an automatic design unit 46, in addition to functions of a transfer function calculation unit 41, a transfer function limit value calculation unit 42, an assignment calculation unit 43, an evaluation unit 44, etc., which are similar to those of the calculation unit 34 of the evaluation device 31 in Figure 2.

[0060] The design device 31B uses a transfer function G similar to that of the evaluation device 31 to determine design rules (design limit values) of design parameters for designing the electric device system 1. The design parameters are similar to those used in the evaluation device 31.

[0061] 7 is a flowchart showing the flow of the design rule setting process for design parameters in this embodiment. In this design rule setting process, the design limit value k L The flow (steps S1 and S2) up to obtaining is the same as the above evaluation process (FIG. 3). However, when obtaining the transfer function G, if the wiring path and the like have not been designed, information on the restrictions or specifications of the wiring path (such as the limit value of the wiring length l and the wiring distance d) is obtained, and the self-inductance L2 of the second wiring 23 and the mutual inductance M between the wiring parts 13 and 23 are calculated based on that information.

[0062] The design parameter limit value calculation unit 45 calculates the transfer function value k by subtracting the design limit value k of the transfer function G from the design limit value k of the transfer function G. L The design limit value P of the design parameter set as a variable of the transfer function G so as not to exceed L (Step S3B). More specifically, the design parameter limit value calculation unit 45 sequentially assigns values ​​within the range of values ​​that the variables of the transfer function G can take, and sets the value k E is the set frequency range S f The design limit value k of the transfer function G in the entire range L Determine whether it is within.

[0063] 8 is a graph for explaining the setting of the design limit value of the design parameter in this embodiment. The graph D3 shown in FIG. 8 is the same as the graph D3 shown in FIG. 4, and the design limit value k L Graphs D6 and D7 show the frequency characteristics of the transfer function k obtained by substituting the variables of the transfer function G with the predetermined values ​​that the design parameters can take. E 1 is a graph showing frequency characteristics of

[0064] For example, when the design parameter set as a variable of the transfer function G is the mutual inductance M, the design parameter limit value calculation unit 45 first calculates the value k of the transfer function when the maximum value that the mutual inductance M can take is substituted into the transfer function G. E The frequency characteristic (graph D6) of is calculated, and it is within the set frequency range S f The design limit value k of the transfer function G over the entire range L Determine whether it is within.

[0065] Transfer function value k E is the set frequency range S f The design limit value k of the transfer function G over the entire range L If the difference is not within the range, the design parameter limit value calculation unit 45 substitutes a value smaller than the previous calculation by a predetermined value for the variable of the transfer function G, and performs the same judgment again. The design parameter limit value calculation unit 45 performs such substitution and judgment on the value k of the transfer function. E is the set frequency range S f The design limit value k of the transfer function G over the entire range L Repeat until it is within.

[0066] As a result, the design parameter limit value calculation unit 45 first obtains the value k E is the set frequency range S f The design limit value k of the transfer function G over the entire range L The design value (value of the variable in graph D7) when it is within the design limit value P L That is, the design parameter limit value calculation unit 45 determines the value k Eis the set frequency range S f The design limit value k of the transfer function G in the entire range L The transfer function value k at a given frequency is within the design value E The value of the variable of the transfer function G at which the value is the largest is the design limit value P L Alternatively, the design parameter limit value calculation unit 45 determines the transfer function k E is the set frequency range S f The design limit value k of the transfer function G in the entire range L Among the design values ​​that are within the range, the design limit value k of the transfer function G L The value of the variable of the transfer function G where the minimum difference between the L may be determined.

[0067] The design parameter limit value calculation unit 45 calculates the design limit value P L is set as the design rule (step S4B). By changing the type of design parameter set as the variable of the transfer function, it is possible to formulate design rules for a plurality of design parameters.

[0068] As design modes using the design rules formulated as described above, the following two types of modes can be considered, for example.

[0069] (1) Evaluation of design values ​​using design rules In this embodiment, the design limit value k of the transfer function G used in the above evaluation (FIG. 3) L Instead of the above, the design limit value P of the design parameter set as a design rule is L This is used to evaluate the quality of the design values.

[0070] 3, the substitution calculation unit 43 receives input of the design values ​​of the design parameters set as variables of the transfer function G from the input unit 32. The substitution calculation unit 43 sets the design values ​​of the design parameters input by the input unit 32 as the design values ​​of the evaluation target.

[0071] The evaluation unit 44 is a set frequency range Sf Design value and design limit value of design parameter P L More specifically, the evaluation unit 44 evaluates whether the design value is good or bad by comparing the design value with the design limit value P L Determine whether the design value is equal to or less than the parameter design limit value P L If it is equal to or less than this, the evaluation unit 44 judges the design value to be good. The judgment result is output from the output unit 35 (for example, displayed on a display device).

[0072] (2) Automatic design using design rules In this embodiment, the design limit value P of the design parameter set as the design rule L This automatically calculates good design values.

[0073] In this case, the automatic design unit 46 sets a design value range of the design parameters in the electric equipment system 1, and within the design value range of the design parameters, a design limit value P L Within the good design range S P The design value range may be set to a range input by the user from the input unit 32, or may be set based on data previously stored in the storage unit 33 as specifications, standards, or the like. The automatic design unit 46 calculates a good design value range S for each design parameter that simultaneously satisfies each design rule for a plurality of design parameters. P and outputs the result to the output unit 35.

[0074] In addition, the good design range S of each design parameter that simultaneously satisfies each design rule for multiple design parameters is P If no such value exists, the automatic design unit 46 performs a display or the like to prompt a user to change the design value range of the design parameter. In this case, the automatic design unit 46 may display a value (a value outside the design value range) that satisfies the design rule and is closest to the design value range for the predetermined design parameter.

[0075] As described above, according to the design device 31B or the design method of this embodiment, it is possible to formulate design rules that take into account the inductive interference between the first electric system 10 and the second electric system 20 based on the transfer function G using the mutual inductance M between the first wiring 13 and the second wiring 23. At this time, a design rule is formulated for each design parameter that can be set as a variable in the transfer function G, so that the design rules (design limit value P L ) as a constraint, a comprehensive design can be performed taking into consideration the inductive interference between the multiple wiring portions 13 and 23.

[0076] In addition, since each design parameter can be evaluated using the established design rules, if the inductive interference becomes excessive, the cause can be easily grasped. Therefore, the cause of the inductive interference between the multiple wiring parts 13, 23 can be evaluated in advance. In addition, since the established design rules can be used to automatically design each design parameter, it is possible to easily perform a design that takes into account the inductive interference between the multiple wiring parts 13, 23.

[0077] The present invention is not limited to the above-described embodiment, and the configuration can be changed, added, or deleted without departing from the spirit of the present invention.

[0078] For example, in the above embodiment, the effect of the inductive interference caused by the high-voltage electric system (the first electric system 10: the victim system) in the low-voltage electric system (the second electric system 20: the victim system) is evaluated, but the present invention is not limited to this. For example, it is also possible to evaluate the effect of the inductive interference caused by the low-voltage electric system (the second electric system 20: the victim system) in the high-voltage electric system (the first electric system 10: the victim system) in the same manner as above. The design parameters at this time include at least one of the mutual inductance M, the impedance Z2 of the load 14 connected to the first wiring 13 as the second device 12, the internal impedance Z1 of the first device 11, the self-inductance L1 of the first wiring 13, and the signal level of the second current I2.

[0079] Alternatively, it is possible to evaluate the effects of inductive interference between high-voltage electrical systems or between low-voltage electrical systems.

[0080] It is also possible to evaluate the influence of inductive interference caused by two or more wirings (two or more systems of first wirings 13). For example, when evaluating inductive interference caused by two systems of aggressor wirings to a victim wiring section (second wiring 23), the design limit value SL2 of the signal level of the victim wiring section (second wiring 23) is set to L Distribute the design limit value SL2 to each wiring part on the offending side. L Based on this, the design limit value k of the transfer function G between the first aggressor wiring section and the victim wiring section is calculated. L and the design limit value k of the transfer function G between the second aggressor wiring section and the victim wiring section. L We ask for the following respectively.

[0081] In the present embodiment, the transfer function G has been illustrated as having the first current I1 as input and the second current I2 as output, but is not limited thereto. That is, the transfer function G may have the first current I1 or the first voltage V1 in the first wiring 13 as input, and may have the second current I2 or the second voltage V2 in the second wiring 23 generated by inductive interference between the first wiring 13 and the second wiring 23 based on the first current or the first voltage as output.

[0082] In the case of evaluating the effect of induced interference caused by a high-voltage electric system (first electric system 10: victim system) on a low-voltage electric system (second electric system 20: victim system), the transfer functions based on the combination of input and output and the design parameters that can be taken at that time can be expressed as follows. Note that the transfer function G1 below is the same as the transfer function G (equation (2)) shown in this embodiment. Note that it is also possible to evaluate the effect of induced interference caused by a low-voltage electric system (second electric system 20: victim system) on a high-voltage electric system (first electric system 10: victim system) using a method similar to that described above. In that case, the design parameters can be obtained by swapping the victim side and the victim side.

[0083] [Table 1]

[0084] In addition, the design limit value k of the transfer functions G2 to G4 L is a design limit value SL1 of the signal level according to the input (first current I1 or first voltage V1) of each of the transfer functions G2 to G4, and is a design limit value SL2 of the signal level of the second wiring 23 according to the output (current or voltage in the second wiring 23) of each of the transfer functions G2 to G4. L That is, for example, if the input is a current, the signal level SL1 of the first current I1 in the predetermined frequency range is used, and if the input is a voltage, the signal level SL1 of the first voltage V1 in the predetermined frequency range is used. Also, if the output is a current, the design limit value SL2 of the signal level of the current in the second wiring 23 in the predetermined frequency range is used. L is used, and if the output is a voltage, the design limit value SL2 of the signal level of the voltage in the second wiring 23 in a predetermined frequency range is L is used.

[0085] In addition, in the design device 31B (FIG. 6) in this embodiment, an embodiment in which the calculation unit 34 exerts the functions of each of the components 41 to 46 as a configuration capable of realizing both the aspects of (1) design value evaluation using design rules and (2) automatic design using design rules is exemplified. Alternatively, only either the evaluation of (1) or the automatic design of (2) may be realizable. In order to realize only the evaluation of (1), the calculation unit 34 does not need to function as the automatic design unit 46. In addition, in order to realize only the automatic design of (2), the calculation unit 34 does not need to function as the substitution calculation unit 43, the evaluation unit 44, and the design parameter limit value calculation unit 45.

[0086] In addition, the functions 41 to 46 of the calculation unit 34 of the evaluation device 31 and the design device 31B may be all performed by one calculation unit 34, or the functions may be shared among multiple calculation units 34 provided in one or multiple devices. [Explanation of symbols]

[0087] 1 Electrical Equipment System 10 First Electrical System 11 1st device 12 2nd device 13 1st wiring 20 Second Electrical System 21 Third device 22 4th device 23 2nd wiring 31 Evaluation equipment 41 Transfer function calculation section 42 Transfer function limit value calculation section 43 Assignment operation section 44 Evaluation Section 45 Design parameter limit value calculation section 46 Automatic design department

Claims

1. An evaluation device for an electric equipment system including a first electric system in which a first device and a second device are electrically connected via a first wiring, and a second electric system in which a third device and a fourth device are electrically connected via a second wiring, a transfer function calculation unit that determines a transfer function using mutual inductance between the first wiring and the second wiring, the transfer function having a first current or a first voltage in the first wiring as an input, a second current or a second voltage in the second wiring generated by inductive interference between the first wiring and the second wiring based on the first current or the first voltage as an output, and a predetermined design parameter as a variable; a transfer function limit value calculation unit that calculates a design limit value of the transfer function in a predetermined frequency range from a signal level in the first current or the first voltage in the predetermined frequency range and a design limit value of a signal level in the frequency range of the second wiring; a substitution calculation unit that sets design values ​​of the design parameters in the electric equipment system and calculates a value of the transfer function in the frequency range when the design values ​​are substituted for the variables of the transfer function; an evaluation unit that evaluates whether the design value is good or bad by comparing a value of the transfer function based on the design value in the frequency range with a design limit value of the transfer function.

2. the first electrical system has the first device as a signal source device and the second device as a load device; the second electrical system has the third device as a signal source device and the fourth device as a load device; The design parameters are: The mutual inductance, The impedance of a load of the second device or the fourth device; The internal impedance of the third device; The self-inductance of the first wiring or the second wiring, and The evaluation device according to claim 1 , further comprising at least one of the signal levels of the first wiring.

3. The evaluation device according to claim 1 , wherein the design parameter set to the variable is the mutual inductance.

4. 4. The evaluation device according to claim 1, wherein the design limit value of the transfer function is obtained by calculating a ratio of a design limit value of a signal level in the frequency range of the second wiring to a signal level in the frequency range of the first current.

5. 5. The evaluation device according to claim 1, wherein the first wiring is a driving power supply wiring for driving an electric motor connected to the first electric system.

6. A design device for an electric equipment system including a first electric system in which a first device and a second device are electrically connected via a first wiring, and a second electric system in which a third device and a fourth device are electrically connected via a second wiring, a transfer function calculation unit that determines a transfer function using mutual inductance between the first wiring and the second wiring, the transfer function having a first current or a first voltage in the first wiring as an input, a second current or a second voltage in the second wiring generated by inductive interference between the first wiring and the second wiring based on the first current or the first voltage as an output, and a predetermined design parameter as a variable; a transfer function limit value calculation unit that calculates a design limit value of the transfer function in a predetermined frequency range from a signal level in the first current or the first voltage in the predetermined frequency range and a design limit value of a signal level in the frequency range of the second wiring; a design parameter limit value calculation unit that sets design limit values ​​of the design parameters such that the value of the transfer function in the frequency range does not exceed a design limit value of the transfer function.

7. 7. The design device according to claim 6, further comprising an evaluation unit that sets design values ​​of the design parameters in the electrical equipment system and evaluates whether the design values ​​are good or bad by comparing the design values ​​with design limit values ​​of the design parameters.

8. 7. The design device according to claim 6, further comprising an automatic design unit that sets a design value range of the design parameter in the electric equipment system, and obtains a good design value range of the design parameter within a design limit value of the design parameter, from the design value range of the design parameter.

9. a first electrical system in which the first device and the second device are electrically connected via a first wiring, and a second electrical system in which the third device and the fourth device are electrically connected via a second wiring; A method for evaluating an electrical equipment system, comprising: a transfer function using mutual inductance between the first wiring and the second wiring, the transfer function having a first current or a first voltage in the first wiring as an input, a second current or a second voltage in the second wiring generated by inductive interference between the first wiring and the second wiring based on the first current or the first voltage as an output, and a predetermined design parameter as a variable; determining a design limit value of the transfer function in a predetermined frequency range from a signal level of the first current or the first voltage in the predetermined frequency range and a design limit value of a signal level of the second wiring in the predetermined frequency range; setting design values ​​of the design parameters in the electrical equipment system, and calculating values ​​of the transfer function in the frequency range when the design values ​​are substituted into the variables of the transfer function; The evaluation method includes comparing a value of the transfer function based on the design value in the frequency range with a design limit value of the transfer function to evaluate whether the design value is good or bad.

10. A method for designing an electric equipment system including a first electric system in which a first device and a second device are electrically connected via a first wiring, and a second electric system in which a third device and a fourth device are electrically connected via a second wiring, comprising: a transfer function using mutual inductance between the first wiring and the second wiring, the transfer function having a first current or a first voltage in the first wiring as an input, a second current or a second voltage in the second wiring generated by inductive interference between the first wiring and the second wiring based on the first current or the first voltage as an output, and a predetermined design parameter as a variable; determining a design limit value of the transfer function in a predetermined frequency range from a signal level of the first current or the first voltage in the predetermined frequency range and a design limit value of a signal level of the second wiring in the predetermined frequency range; setting design limit values ​​of the design parameters such that the value of the transfer function in the frequency range does not exceed a design limit value of the transfer function.

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