Interference wave power measuring device and interference wave power measuring method

Abstract

To provide an interference power measuring device that can measure interference power with a simple configuration. [Solution] The interference wave power measuring device 100 comprises a power cable 11 connecting a power supply PS and an electrical device EP, an antenna 12 for receiving radiated noise from the power cable 11, a base material 2 for fixing the power cable 11 and the antenna 12, and an analyzer 4 for determining the frequency spectrum SP of the radiated noise. The power cable 11 is fixed to the base material 2, and the antenna 12 is fixed to the base material 2 or to the power cable 11 so as to run along the power cable 11.

Description

Technical Field

[0001] The present disclosure relates to a spurious wave power measurement device and a spurious wave power measurement method.

Background Art

[0002] Patent Document 1 discloses a method of simulating spurious radiation noise at the design stage of a circuit configuration.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure provides a spurious wave power measurement device and a spurious wave power measurement method that can measure spurious wave power with a simple configuration.

Means for Solving the Problems

[0005] The spurious wave power measurement device in the present disclosure includes a power cable connecting a power supply and an electrical device, an antenna that receives spurious radiation noise from the power cable, a base material that fixes the power cable and the antenna, and an analyzer that obtains the frequency characteristics of the spurious radiation noise. The power cable is fixed to the base material, and the antenna is fixed to the base material or the power cable along the power cable.

[0006] Furthermore, the interference power measurement method in this disclosure is an interference power measurement device method comprising: a power cable connecting a power source and an electrical device; an antenna for receiving radiated noise from the power cable; a base material for fixing the power cable and the antenna; and an analyzer for determining the frequency characteristics of the radiated noise, wherein the power cable is fixed to the base material, the antenna is fixed to the base material or the power cable so as to be along the power cable, and the analyzer determines the frequency characteristics of the radiated noise from the power cable. [Effects of the Invention]

[0007] The interference power measuring device and interference power measuring method described herein can measure interference power with a simple configuration. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows the configuration of the interference wave power measuring device in this embodiment. [Figure 2] A perspective view showing the configuration of the power cable and antenna fixed to the substrate in this embodiment. [Figure 3] Cross-sectional perspective view showing the arrangement of the power cable, antenna, and ground wire in this embodiment. [Figure 4] Flowchart showing the processing of the control unit in this embodiment [Figure 5] Graph showing the measurement results of the interference wave power measuring device in this embodiment. [Figure 6A] Cross-sectional view showing an example of the arrangement of the power cable and antenna in this embodiment. [Figure 6B] Cross-sectional view showing an example of the arrangement of the power cable and antenna in this embodiment. [Figure 6C] Cross-sectional view showing an example of the arrangement of the power cable and antenna in this embodiment. [Modes for carrying out the invention]

[0009] (Knowledge and other information that formed the basis of this disclosure) At the time the inventors conceived of this disclosure, for example, simulations using substrate design CAD data proposed in Patent Document 1 presented a major challenge in matching these simulations with actual measurement data. Therefore, there was a demand for noise measurement using simple equipment at the laboratory level. On the other hand, a simple measurement system had been proposed for measuring noise terminal voltage. However, no simple device had been proposed for measuring interference power in a configuration that scans a 6m power cable with an absorption clamp to smooth the antenna radiation characteristics. The inventors found that, in order to create a simple device, they could fix a 6m power cable to a base material and fix a noise measurement antenna to the base material or the like along the power cable. With this configuration, we discovered that it is possible to obtain a correlated waveform of interference power by converting radiated noise from the power cable of electrical equipment into a current flowing through the antenna according to the right-hand rule. Furthermore, we discovered that by running the antenna along the entire length of the power cable, it is possible to measure interference power while taking into account the antenna characteristics due to the length of the power cable, similar to when scanning with an absorption clamp, and this constitutes the subject of this disclosure. Therefore, this disclosure provides an interference power measuring device and an interference power measuring method that can measure interference power with a simple configuration.

[0010] The embodiments will be described in detail below with reference to the drawings. However, some unnecessarily detailed explanations may be omitted. For example, detailed explanations of already well-known matters or redundant explanations of substantially identical configurations may be omitted. The attached drawings and the following description are provided to enable those skilled in the art to fully understand this disclosure and are not intended to limit the subject matter described in the claims.

[0011] [1. Configuration of the interference power measuring device] FIG. 1 shows the X-axis, Y-axis, and Z-axis that are orthogonal to each other. The X-axis and the Y-axis are parallel to the horizontal direction. The Z-axis is parallel to the perpendicular direction. The X-axis is parallel to the left-right direction. The Y-axis is parallel to the front-back direction. The positive direction of the X-axis indicates the right direction. The positive direction of the Y-axis indicates the back direction. The positive direction of the Z-axis indicates the upward direction. FIGS. 2 and 3 also show the X-axis, Y-axis, and Z-axis in the same manner as FIG. 1.

[0012] FIG. 1 is a diagram showing the configuration of the interference wave power measurement device 100 in the present embodiment. As shown in FIG. 1, the interference wave power measurement device 100 includes a power cable 11, an antenna 12, a base material 2, an amplifier 3, and an analyzer 4.

[0013] The power cable 11 connects the power supply PS and the electrical equipment EP. The power supply PS supplies AC power to one end P11 of the power cable 11 via the first power line CB1. The power supply PS is composed of, for example, a stabilized power supply. The first power line CB1 is a power line provided in the power supply PS, and a plug is arranged at the end. For example, a power tap is arranged at one end P11 of the power cable 11, and the plug of the first power line CB1 is attached to the power tap.

[0014] The AC power supplied from the power supply PS is supplied to the electrical equipment EP from the other end P32 of the power cable 11 via the second power line CB2. The second power line CB2 is a power line provided in the electrical equipment EP, and a plug is arranged at the end. For example, a power tap is arranged at the other end P32 of the power cable 11, and the plug of the second power line CB2 is attached to the power tap.

[0015] In this way, the AC power is supplied from the power supply PS to the electrical equipment EP sequentially via the first power line CB1, the power cable 11, and the second power line CB2.

[0016] The electrical device EP is, for example, a household electrical appliance. Specifically, the electrical device EP includes, for example, an air conditioner, a refrigerator, a washing machine, a cooking heater, etc. Further, the electrical device EP may be, for example, an office device. The electrical device EP includes, for example, a copier, a printer, etc.

[0017] The power cable 11 is fixed to the base material 2. In this embodiment, a case where the power cable 11 is folded back and fixed to the base material 2 will be described as an example. The base material 2 is composed of, for example, a first base material 21, a second base material 22, and a third base material 23. As shown in FIG. 2, each of the first base material 21, the second base material 22, and the third base material 23 is formed in a flat plate shape. Each of the first base material 21, the second base material 22, and the third base material 23 is composed of an insulating material. Each of the first base material 21, the second base material 22, and the third base material 23 is composed of, for example, polypropylene.

[0018] Further, as shown in FIG. 1, the first base material 21, the second base material 22, and the third base material 23 are arranged substantially parallel to each other. Each of the first base material 21, the second base material 22, and the third base material 23 is arranged substantially parallel to the XY plane, for example. Further, the first base material 21, the second base material 22, and the third base material 23 are arranged along the Z-axis direction. In FIG. 1, the first base material 21, the second base material 22, and the third base material 23 are arranged in this order toward the negative direction of the Z-axis.

[0019] The distance LB indicates the distance between the first base material 21 and the second base material 22. The distance LB also indicates the distance between the second base material 22 and the third base material 23. That is, the first base material 21, the second base material 22, and the third base material 23 are arranged at equal intervals along the Z-axis direction. The distance LB is equal to or greater than a predetermined distance LP. The predetermined distance LP is the minimum necessary interval in the Z-axis direction to prevent the radiation noise generated from each power cable 11 from interfering with each other and affecting the measurement result at a location where the folded power cable 11 is close. The predetermined distance LP is, for example, "8 cm". The distance LB is, for example, "10 cm".

[0020] Antenna 12 receives radiated noise from power cable 11. Antenna 12 is fixed to the base material 2 or to the power cable 11 so as to run along the power cable 11. In this embodiment, antenna 12 is fixed to the base material 2 so as to run along the power cable 11.

[0021] The antenna 12 is composed of, for example, a lead wire. The lead wire is composed of a conductor made of a conductive material such as copper, and a covering member that covers the conductor. The covering member is made of, for example, polyvinyl chloride.

[0022] The lengths of the power cable 11 and the antenna 12 are, for example, a specified length LS. The specified length is, for example, "6m". The specified length LS is defined by the standard "CISPR14-1" established by the International Special Committee on Radio Interference (CISPR). The interference power measuring device 100 according to this embodiment is a device that measures measurement results that approximate the measurement results of an interference power measuring device specified by the above standard "CISPR14-1" with a simple configuration.

[0023] In this embodiment, the case where the length of the power cable 11 and the antenna 12 is a specified length LS, i.e., "6m", is described, but the length of the power cable 11 and the antenna 12 may be shorter than the specified length LS, i.e., "6m". For example, the length of the power cable 11 and the antenna 12 may be "4m". In this case, since the length of the power cable 11 and the antenna 12 is shorter than the specified length LS, interference wave power can be measured in a more compact configuration compared to the case where the length of the power cable 11 and the antenna 12 is a specified length LS.

[0024] Next, with reference to Figure 2, the configuration of the power cable 11 and antenna 12 fixed to the base material 2 will be described. Figure 2 is a perspective view showing the configuration of the power cable 11 and antenna 12 fixed to the first base material 21 in this embodiment. The power cable 11 and antenna 12 are fixed to the upper surface of the first base material 21 with fixing members (not shown). The fixing members secure the power cable 11 and antenna 12 to the upper surface of the first base material 21 at predetermined intervals.

[0025] As shown in Figure 2, the power cable 11 and antenna 12 are arranged linearly in the longitudinal direction of the first base material 21, that is, parallel to the Y-axis direction, starting from one end P11, and directed toward the positive Y-axis direction, and are folded back in a semicircular manner near the positive Y-axis end of the first base material 21. After being folded back in a semicircular manner, the power cable 11 and antenna 12 are then arranged linearly in the longitudinal direction of the first base material 21, that is, parallel to the Y-axis direction, and directed toward the negative Y-axis direction, and are folded back in a semicircular manner near the negative Y-axis end of the first base material 21.

[0026] The power cable 11 and antenna 12 are then folded back in a semicircular shape and positioned linearly in the longitudinal direction of the first base material 21, that is, parallel to the Y-axis direction, and are folded back again in a semicircular shape near the end of the first base material 21 in the positive Y-axis direction. The power cable 11 and antenna 12 are then folded back in a semicircular shape and positioned linearly in the longitudinal direction of the first base material 21, that is, parallel to the Y-axis direction, toward the negative Y-axis direction, and extend to the end position P12 of the first base material 21 in the negative Y-axis direction.

[0027] In this arrangement, the power cable 11 and antenna 12 on the first substrate 21 are composed of four linear portions extending in the Y-axis direction, two semicircular portions that are folded back in a semicircular manner near the positive Y-axis end of the first substrate 21, and one semicircular portion that is folded back in a semicircular manner near the negative Y-axis end of the first substrate 21.

[0028] In the first substrate 21, the four linear portions of the power cable 11 and antenna 12 that extend in the Y-axis direction are arranged at approximately equal intervals from one another. In other words, the distance LA shown in Figure 2 represents the distance between two adjacent linear portions of the power cable 11 and antenna 12 that extend in the Y-axis direction. The distance LA is greater than or equal to a predetermined distance LP. The predetermined distance LP is the minimum distance required to prevent radiated noise generated from each power cable 11 from interfering with each other and affecting the measurement results at adjacent locations of the power cables 11. The predetermined distance LP is, for example, "8 cm". The distance LA is, for example, "10 cm".

[0029] By setting the predetermined distance LP to an appropriate value, it is possible to prevent radiated noise generated from the power cable 11 from interfering with each other and affecting the measurement, and to reduce measurement errors associated with folding and fixing the power cable 11 to the base material 2.

[0030] Furthermore, by applying radio wave shielding measures, such as covering the power cable 11 and antenna 12 with shielding wire, mutual interference of radiated noise between the power cables 11 can be suppressed. In this case, it becomes unnecessary to consider the predetermined distance LP.

[0031] The arrow VA indicates the direction of AC power supply in the power cable 11. AC power supplied from the power supply PS via the first power line CB1 to one end P11 of the power cable 11 is supplied along the power cable 11 in the direction of arrow VA. Then, AC power is supplied along the power cable 11 to the negative end position P12 of the first substrate 21 in the Y-axis direction.

[0032] Next, we will return to Figure 1 and further explain the configuration of the power cable 11 and antenna 12. As shown in Figure 1, the power cable 11 and the antenna 12 are positioned along the Z-axis from the negative Y-axis end position P12 of the first substrate 21 to the negative Y-axis end position P21 of the second substrate 22.

[0033] The power cable 11 and antenna 12 are then folded back and fixed to the upper surface of the second base material 22. On the second base material 22, the power cable 11 and antenna 12 are arranged in the same way as on the first base material 21 and are fixed to the upper surface of the second base material 22 with fixing members (not shown).

[0034] In other words, in the second substrate 22, the power cable 11 and antenna 12 are composed of four linear portions extending in the Y-axis direction, two semicircular portions that are folded back in a semicircular manner near the positive Y-axis end of the second substrate 22, and one semicircular portion that is folded back in a semicircular manner near the negative Y-axis end of the second substrate 22.

[0035] In the second substrate 22, the four linear portions of the power cable 11 and antenna 12 that extend in the Y-axis direction are arranged at approximately equal intervals from one another. In other words, distance LA, as described with reference to Figure 2 for the first substrate 21, indicates the distance between two adjacent linear portions of the power cable 11 and antenna 12 that extend in the Y-axis direction in the second substrate 22. Distance LA is greater than or equal to a predetermined distance LP. The predetermined distance LP is, for example, "8 cm". Distance LA is, for example, "10 cm".

[0036] AC power input to the negative Y-axis end position P21 of the second substrate 22 is supplied to the negative Y-axis end position P22 of the second substrate 22 by a power cable 11 that is folded back and fixed to the upper surface of the second substrate 22.

[0037] The power cable 11 and the antenna 12 are positioned vertically from the negative Y-axis end position P22 of the second substrate 22 to the negative Y-axis end position P31 of the third substrate 23.

[0038] The power cable 11 and antenna 12 are then folded back and fixed to the upper surface of the third base material 23. On the third base material 23, the power cable 11 and antenna 12 are arranged in the same way as on the first base material 21 and are fixed to the upper surface of the third base material 23 with fixing members (not shown).

[0039] In other words, in the third substrate 23, the power cable 11 and antenna 12 are composed of four linear portions extending in the Y-axis direction, two semicircular portions that are folded back in a semicircular manner near the positive Y-axis end of the third substrate 23, and one semicircular portion that is folded back in a semicircular manner near the negative Y-axis end of the third substrate 23.

[0040] In the third substrate 23, the four linear portions of the power cable 11 and antenna 12 that extend in the Y-axis direction are arranged at approximately equal intervals from one another. In other words, distance LA, as with the first substrate 21 described with reference to Figure 2, represents the distance between two adjacent linear portions of the power cable 11 and antenna 12 that extend in the Y-axis direction in the third substrate 23. Distance LA is greater than or equal to a predetermined distance LP. The predetermined distance LP is, for example, "8 cm". Distance LA is, for example, "10 cm".

[0041] AC power input to the negative Y-axis end position P31 of the third substrate 23 is supplied to the other end P32 of the power cable 11, which is located at the negative Y-axis end of the third substrate 23, by the power cable 11 which is folded back and fixed to the upper surface of the third substrate 23.

[0042] The AC power is then supplied to the electrical equipment EP from the other end P32 of the power cable 11, which is located at the negative Y-axis end of the third substrate 23, via the second power line CB2.

[0043] As described above, the antenna 12 is fixed to the first base material 21, the second base material 22, and the third base material 23 along the power cable 11. Furthermore, the antenna 12 is positioned along the power cable 11 from one end P11 to the other end P32. The antenna 12 receives radiated noise from the power cable 11. The signal indicating the radiated noise received by the antenna 12 is transmitted to the amplifier 3 via the signal line SL.

[0044] The signal line SL transmits a signal indicating radiated noise from the antenna 12, which is located near one end P11 of the power cable 11, to the amplifier 3. Amplifier 3 amplifies the signal indicating radiated noise transmitted from antenna 12 and transmits the amplified signal to analyzer 4.

[0045] The analyzer 4 determines the frequency characteristics of the radiated noise based on the signal indicating the radiated noise input from the amplifier 3. The analyzer 4 is composed of, for example, a spectrum analyzer, an oscilloscope with spectrum analyzer functionality, etc. The analyzer 4 determines the frequency spectrum SP of the radiated noise. The frequency spectrum SP corresponds to an example of "frequency characteristics".

[0046] The analyzer 4 determines the frequency spectrum SP of the radiated noise, for example, as follows: First, analyzer 4 determines the first frequency spectrum SP1 of the radiated noise received by antenna 12 with the power supply of electrical equipment EP turned off. With the power supply of electrical equipment EP turned off, the radiated noise received by antenna 12 corresponds to "dark noise," which is environmentally derived radiated noise received by the entire measurement system, including the power supply PS, power cable 11, antenna 12, and electrical equipment EP. Next, analyzer 4 determines the second frequency spectrum SP2 of the radiated noise received by antenna 12 with the power supply of electrical equipment EP turned on. Then, analyzer 4 determines the frequency spectrum SP of the radiated noise by subtracting the first frequency spectrum SP1 from the second frequency spectrum SP2. In other words, with the power supply of electrical equipment EP turned on, analyzer 4 determines the frequency spectrum SP of the radiated noise of electrical equipment EP by removing the ambient noise, or "dark noise," from the radiated noise received by antenna 12. The first frequency spectrum SP1 corresponds to an example of the "first frequency characteristic". The second frequency spectrum SP2 corresponds to an example of a "second frequency characteristic."

[0047] As shown in Figure 1, the interference power measuring device 100 may also include a housing 5. The housing 5 houses the power cable 11, antenna 12, and base material 2, and blocks external radiated noise. The housing 5 is formed, for example, in the shape of a box. The housing 5 is composed of, for example, polypropylene and a shielding member. The housing 5 is formed in the shape of a box from, for example, polypropylene. A shielding member is also attached to the outer surface of the housing 5. The shielding member is, for example, a shielding cloth. Conductive materials such as copper and aluminum are woven into the shielding cloth. The housing 5 may also be formed in a box shape from a plate-like member of a conductive material such as copper or aluminum.

[0048] If the entire measurement system, including the interference wave power measuring device 100, power supply PS, and electrical equipment EP, is covered with a simple shielding material like the one used for the housing 5 to shield it from radio waves, then the radiated noise received by the antenna 12 will not include external radiated noise, and therefore it is not necessary to determine the first frequency spectrum SP1. In this case, the analyzer 4 only needs to determine the frequency spectrum SP of the radiated noise received by the antenna 12 with the power supply of the electrical equipment EP turned on.

[0049] In this embodiment, the analyzer 4 includes, for example, a control unit 41. For example, analyzer 4 comprises a spectrum analyzer, an oscilloscope with spectrum analyzer functionality, and a personal computer. Alternatively, analyzer 4 may be equipped with a tablet computer or a smartphone instead of a personal computer. The control unit 41 includes a processor 41B, such as a CPU (Central Processing Unit), a memory 41A, and an interface circuit for connecting other devices and sensors, and controls each part of the analyzer 4. Furthermore, the control unit 41 is connected to the electrical equipment EP in a communicative manner and controls the on / off state of the electrical equipment EP.

[0050] Memory 41A is a memory that stores programs and data. Memory 41A stores data to be processed by the control program 411 and processor 41B. Memory 41A has a non-volatile storage area. Alternatively, memory 41A may also have a volatile storage area and constitute the work area of ​​processor 41B. Memory 41A is composed of, for example, ROM (Read Only Memory) or RAM (Random Access Memory).

[0051] The control unit 41 performs the following processes by having the processor 41B execute the control program 411.

[0052] Specifically, the control unit 41 first turns off the power to the electrical equipment EP. Then, the control unit 41 instructs the analyzer 4 to determine the first frequency spectrum SP1 of the radiated noise received by the antenna 12. Next, the control unit 41 turns on the power to the electrical equipment EP. Then, the control unit 41 instructs the analyzer 4 to determine the second frequency spectrum SP2 of the radiated noise received by the antenna 12. Then, the control unit 41 obtains the frequency spectrum SP of the radiated noise by subtracting the first frequency spectrum SP1 from the second frequency spectrum SP2. The processing of the control unit 41 will be further explained later with reference to Figure 4. In this embodiment, the case in which the control unit 41 controls the on / off of the power of the electrical equipment EP is described, but the embodiment is not limited to this, and the user may also perform the on / off operation of the power of the electrical equipment EP.

[0053] Furthermore, the electrical equipment EP may have a "standby mode" in which the power is on but the electrical equipment EP does not perform any operations, and a "load mode" in which the power is on and the electrical equipment EP performs operations. In this case, the control unit 41 may control the electrical equipment EP to the "standby mode" and cause the analyzer 4 to determine the first frequency spectrum SP1 of the radiated noise received by the antenna 12.

[0054] Next, the arrangement of the power cable 11, antenna 12, and ground wire 13 will be described with reference to Figure 3. Figure 3 is a cross-sectional perspective view showing the arrangement of the power cable 11, antenna 12, and ground wire 13 in this embodiment.

[0055] As shown in Figure 3, the power cable 11 is, for example, a VVF (Vinyl insulated Vinyl sheathed Flat-type) cable. The VVF cable has two conductors 111 and a sheath 112. Each of the two conductors 111 is, for example, a stranded copper wire. The insulator 112 covers the two conductors 111 as a whole, spaced a predetermined distance apart from each other. The insulator 112 is made of an insulating material such as polyvinyl chloride.

[0056] As shown in Figure 3, the power cable 11 is fixed to the base material 2 by a fixing member (not shown) such that, for example, the positions of the two conductors 111 in the Z-axis direction coincide with each other. In other words, the power cable 11 is fixed to the base material 2 by a fixing member (not shown) such that, for example, the centerlines of the two conductors 111 lie on a single XY plane. Furthermore, the two conductors 111 do not necessarily have to be fixed to the base material 2 so that their positions in the Z-axis direction coincide with each other. For example, the two conductors 111 may be fixed to the base material 2 so that their positions in the Z-axis direction are offset from each other.

[0057] Furthermore, the antenna 12 is positioned, for example, above the center of the power cable 11 in the left-right direction. In other words, the antenna 12 is positioned on the upper surface of the power cable 11, for example, along the recess of the sheath 112 at the center of the power cable 11 in the left-right direction. Note that the antenna 12 does not necessarily have to be positioned above the center of the power cable 11 in the left-right direction. The antenna 12 may, for example, be positioned below the center of the power cable 11 in the left-right direction.

[0058] Furthermore, the ground wire 13 is positioned, for example, below the center of the power cable 11 in the left-right direction. In other words, the ground wire 13 is positioned on the underside of the power cable 11, for example, along a recess in the sheath 112 at the center of the power cable 11 in the left-right direction. The ground wire 13 is composed of, for example, a lead wire. The lead wire is composed of, for example, a conductor made of a conductive material such as copper, and a covering member that covers the conductor. The covering member is made of, for example, polyvinyl chloride. The ground wire 13 is connected to the grounding location of at least one of the power supply PS and the electrical equipment EP.

[0059] [2. Processing of the control unit] Next, the processing of the control unit 41 will be explained. Figure 4 is a flowchart showing the processing of the control unit 41. First, as shown in Figure 4, in step S101, the control unit 41 turns off the power to the electrical equipment EP. Next, in step S103, the control unit 41 causes the analyzer 4 to acquire a noise signal indicating the radiated noise received by the antenna 12. Next, in step S105, the control unit 41 instructs the analyzer 4 to determine the first frequency spectrum SP1 based on the noise signal acquired in step S103.

[0060] Next, in step S107, the control unit 41 turns on the power to the electrical equipment EP. Next, in step S109, the control unit 41 causes the analyzer 4 to acquire a noise signal indicating the radiated noise received by the antenna 12. Next, in step S111, the control unit 41 instructs the analyzer 4 to determine the second frequency spectrum SP2 based on the noise signal acquired in step S109. Next, in step S113, the control unit 41 obtains the frequency spectrum SP of the radiated noise by subtracting the first frequency spectrum SP1 from the second frequency spectrum SP2. After that, the process ends.

[0061] Furthermore, if the electrical equipment EP has a "standby mode" and a "load mode," the control unit 41 may control the electrical equipment EP as follows. In step S101, the control unit 41 controls the electrical equipment EP to "standby mode". In step S107, the control unit 41 controls the electrical equipment EP to "load mode".

[0062] [3. Experimental Results] Next, the measurement results of the interference power measuring device 100 will be explained with reference to Figure 5. Figure 5 is a graph showing the measurement results of the interference power measuring device 100 in this embodiment. Furthermore, the interference power measuring device 100 measured the frequency spectrum SP of radiated noise from the power cable 11 of the electrical equipment EP without the housing 5 shown in Figure 1. The length of the power cable 11 and antenna 12 was "approximately 6m". The distance LA shown in Figure 2 was "10cm". The distance LB shown in Figure 1 was "10cm".

[0063] The analyzer 4 obtained the frequency spectrum SP of the radiated noise from the power cable 11 by subtracting the first frequency spectrum SP1 from the second frequency spectrum SP2. The first frequency spectrum SP1 is the frequency spectrum of the radiated noise received by the antenna 12 when the power to the electrical equipment EP is off. The second frequency spectrum SP2 is the frequency spectrum of the radiated noise received by the antenna 12 when the power to the electrical equipment EP is on.

[0064] In the graph shown in Figure 5, the horizontal axis represents frequency F (Hz), and the vertical axis represents gain dB (μV). The first graph G11 shown in Figure 5 is a graph showing the results measured using the measurement equipment specified by "CISPR14-1". The second graph G12 shown in Figure 5 is a graph showing the measurement results of the interference wave power measuring device 100 in this embodiment.

[0065] As shown in Figure 5, the second graph G12 showed a waveform that was highly correlated with the first graph G11. Furthermore, the specific frequency FM at which the gain dB was maximum in the second graph G12 roughly coincided with the specific frequency at which the gain dB was maximum in the first graph G11. Thus, the measurement results from the interference wave power measuring device 100 were similar to the results obtained using the measuring equipment specified by "CISPR14-1".

[0066] [4. Effects, etc.] As described above, the interference power measuring device 100 comprises a power cable 11 connecting a power supply PS and an electrical device EP, an antenna 12 for receiving radiated noise from the power cable 11, a base material 2 for fixing the power cable 11 and the antenna 12, and an analyzer 4 for determining the frequency spectrum SP of the radiated noise. The power cable 11 is fixed to the base material 2, and the antenna 12 is fixed to the base material 2 along the power cable 11.

[0067] This configuration eliminates the need to scan the power cable 11 to measure the interference power, thus allowing for measurement of interference power with a simple configuration.

[0068] In the interference power measuring device 100, the power cable 11 is folded back and fixed to the base material 2.

[0069] With this configuration, the power cable 11 is folded back and fixed to the base material 2, allowing for measurement of interference power in a compact configuration.

[0070] In the interference wave power measuring device 100, the antenna 12 is made up of lead wires.

[0071] With this configuration, since the antenna 12 is made up of lead wires, interference power can be measured with a simple configuration.

[0072] In the interference wave power measuring device 100, the base material 2 includes a flat first base material 21 and a flat second base material 22 arranged substantially parallel to the first base material 21, and the distance LB between the first base material 21 and the second base material 22 is greater than or equal to a predetermined distance LP.

[0073] With this configuration, the base material 2 includes a flat first base material 21 and a flat second base material 22 arranged substantially parallel to the first base material 21. Therefore, compared to the case where the base material 2 is made of a single flat member, interference wave power can be measured in a more compact configuration. Furthermore, since the distance LB between the first base material 21 and the second base material 22 is greater than or equal to a predetermined distance LP, by setting the predetermined distance LP to an appropriate value, it is possible to prevent radiated noise generated from the power cable 11 from interfering with each other and affecting the measurement, and to reduce measurement errors associated with folding and fixing the power cable 11 to the first base material 21 and the second base material 22, respectively. The predetermined distance LP is, for example, "8 cm", and the distance LB is, for example, 10 cm.

[0074] In the interference power measuring device 100, the power cable 11, antenna 12, and substrate 2 may be housed in a housing 5 that blocks external radiated noise.

[0075] In this configuration, the power cable 11, antenna 12, and base material 2 are housed in a housing 5 that blocks external radiated noise, thus suppressing the effects of external radiated noise.

[0076] In the interference wave power measuring device 100, an amplifier 3 is provided between the antenna 12 and the analyzer 4 to amplify the signal corresponding to the radiated noise received by the antenna 12.

[0077] This configuration allows for improved measurement accuracy of interference power by amplifying the signal corresponding to the radiated noise received by antenna 12.

[0078] In the interference wave power measuring device 100, the power supply PS is composed of a stabilized power supply.

[0079] With this configuration, since the power supply PS is composed of a stabilized power supply, it is possible to suppress the reduction in the measurement accuracy of interference power due to the influence of noise input from the power supply PS.

[0080] The control method for the interference power measuring device 100 comprises a power cable 11 connecting a power supply PS and electrical equipment EP, an antenna 12 receiving radiated noise from the power cable 11, a base material 2 fixing the power cable 11 and the antenna 12, and an analyzer 4 for determining the frequency characteristics of the radiated noise. The interference power measuring method for the interference power measuring device 100 comprises a power cable 11 that connects a power supply PS and electrical equipment EP, an antenna 12 that receives radiated noise from the power cable 11, a base material 2 for fixing the power cable 11 and the antenna 12, and an analyzer 4 for determining the frequency spectrum SP of the radiated noise from the power cable 11.

[0081] This configuration produces the same effects as the interference wave power measuring device 100 described above.

[0082] In the control method for the interference wave power measuring device 100, the analyzer 4 obtains the first frequency spectrum SP1 of the radiated noise received by the antenna 12 when the power supply of the electrical equipment EP is off, obtains the second frequency spectrum SP2 of the radiated noise received by the antenna 12 when the power supply of the electrical equipment EP is on, and obtains the frequency spectrum SP of the radiated noise from the power cable 11 by subtracting the first frequency spectrum SP1 from the second frequency spectrum SP2.

[0083] With this configuration, the frequency spectrum SP of the radiated noise from the power cable 11 is determined by subtracting the first frequency spectrum SP1 from the second frequency spectrum SP2, thus the influence of external radiated noise can be canceled out by calculation. Therefore, the interference power can be accurately measured without having to set up a special shielded room to install the interference power measuring device 100.

[0084] (Other embodiments) As described above, the above embodiment has been explained as an example disclosed in this application. However, the technology in this disclosure is not limited to this embodiment and can be applied to embodiments that have been modified, replaced, added, or omitted. Furthermore, it is possible to combine the components described in the above embodiment to create new embodiments. Therefore, other embodiments are described below as examples.

[0085] In the embodiment described above, the case in which the power cable 11 and antenna 12 are arranged on a base material 2 made of a flat plate-shaped member has been explained, but the embodiment is not limited thereto. For example, the power cable 11 may be placed on the base material 2 in an extended state without being folded. Alternatively, the base material 2 may be made of a cylindrical member, and the power cable 11 and antenna 12 may be spirally wound around the base material 2. This arrangement allows for space saving. When arranging in this way, in order to suppress the interference of radiated noise generated from the power cables that affects the measurement, for example, if the predetermined distance LP is "8 cm", it is desirable that the diameter of the cylindrical base material be 10 cm or more, and that the distance between the power cables 11 be 10 cm or more.

[0086] In the embodiment described above, the case in which the base material 2 is composed of a first base material 21, a second base material 22, and a third base material 23 has been described, but the embodiment is not limited thereto. The base material 2 may be composed of one flat plate-shaped member, two flat plate-shaped members, or four or more flat plate-shaped members. The more flat plate-shaped members that make up the base material 2, the smaller the area of ​​each flat plate-shaped member can be. The fewer flat plate-shaped members that make up the base material 2, the simpler the configuration of the base material 2 can be.

[0087] In the embodiment described above, the case in which the power cable 11 is folded three times in each of the first base material 21, the second base material 22, and the third base material 23 has been explained, but the embodiment is not limited thereto. The number of times the power cable 11 is folded in each of the first base material 21, the second base material 22, and the third base material 23 may be one, two, or four or more times. The more times the power cable 11 is folded, the smaller the size of each of the first base material 21, the second base material 22, and the third base material 23 in the Y-axis direction can be. The fewer times the power cable 11 is folded, the smaller the size of each of the first base material 21, the second base material 22, and the third base material 23 in the X-axis direction can be.

[0088] In the embodiment described above, the case in which the antenna 12 is fixed to the base material 2 along the power cable 11 has been explained, but the embodiment is not limited to this. The antenna 12 may also be fixed to the power cable 11.

[0089] Alternatively, as shown in Figure 6A, the power cable 11 and antenna 12 may be covered with a cylindrical shielding material 14, and the shielding material 14 may be fixed to the base material 2. By covering the power cable 11 and antenna 12 with the shielding material 14, interference due to radiated noise generated from the power cable can be reduced, thereby reducing the distances LA and LB and saving space. Although not shown here, the ground wire 13 may also be covered with the shielding material 14 along with the power cable 11 and antenna 12. The material of the shielding material 14 may be copper, aluminum, or the like.

[0090] Alternatively, as shown in Figure 6B, the antenna 12 may be configured in a hollow shape, and the power cable 11 may be passed through the central space so that the power cable 11 is covered by the antenna 12. In this case, an insulator such as foamed polyethylene may be placed in the gap between the antenna 12 and the power cable 11. Furthermore, the antenna 12 may be further covered with a shielding material 14. Although not shown here, the ground wire 13 may also be covered by the antenna 12 together with the power cable 11.

[0091] Alternatively, as shown in Figure 6C, the antenna 12 may consist of multiple antenna wires 12a, and the multiple antenna wires 12a may be arranged to surround the power cable 11. In this case, the multiple antenna wires 12a do not need to be insulated from each other. Furthermore, the antenna 12 may be further covered with a shielding material 14. Although not shown here, the ground wire 13 may also be arranged between the multiple antennas 12 together with the power cable 11.

[0092] In the above example, the shielding material 14 may be, for example, a braided shielded wire, and the outer and inner surfaces of the shielding material 14 may be insulated as necessary. For example, the outer surface of the shielding material 14 may be covered with an insulating coating, an insulator such as foamed polyethylene may be placed inside the shielding material 14, and the antenna 12 and power cable 11 may be placed inside therein, thereby achieving insulation of the inner and outer surfaces of the shielding material 14. Since the inner and outer surfaces of the shielding material 14 are insulated, even if, for example, each antenna wire 12a is not insulated, there is no electrical conductivity between the antenna wire 12a and the shielding material 14, and therefore the interference wave power can be measured.

[0093] In the embodiment described above, the case in which the power cable 11 and the antenna 12 are fixed to the base material 2 by a fixing member has been explained, but the embodiment is not limited to this. The power cable 11 and the antenna 12 may be fixed to the base material 2 by, for example, an adhesive or adhesive tape.

[0094] In the embodiment described above, the case where the length of the power cable 11 and the antenna 12 is a specified length LS, i.e., "6m", has been described, but the embodiment is not limited to this. The length of the power cable 11 and the antenna 12 may be shorter than the specified length LS. The shorter the length of the power cable 11 and the antenna 12, the more compact the interference wave power measuring device 100 can be configured. The closer the length of the power cable 11 and the antenna 12 is to the specified length LS, the more accurately the interference wave power can be measured. Furthermore, the length of the power cable 11 may be adjusted by configuring it so that multiple power cables 11 can be connected. Similarly, the length of the antenna 12 may be adjusted by configuring it so that multiple antennas 12 can be connected. For example, in the interference wave power measuring device 100 shown in Figure 1 described above, by arranging independent power cables 11 and antennas 12 on the first base material 21, the second base material 22, and the third base material 23, and making the power cables 11 and antennas 12 on each base material connectable, the number of base materials used can be easily changed as needed.

[0095] However, as the length of the power cable 11 and the antenna 12 is shortened, the antenna characteristics due to the length of the power cable 11 are partially impaired, and the correlation of the obtained interference power values ​​is also partially impaired. To address this, as will be described later, it is possible to maintain a high correlation of interference power values ​​by correcting the measurement value of the interference power measuring device 100 based on the relationship between the measurement values ​​of the interference power measuring device 100 in this embodiment and the interference power measuring device defined by "CISPR14-1".

[0096] In the embodiment described above, a device that outputs a wide range of noise across the entire frequency band of the object to be measured may be used as the electrical equipment EP. In this case, correction can be performed with high accuracy as described below. In other words, by obtaining measurement values ​​using the interference power measuring device 100 and the interference power measuring device specified by "CISPR14-1", the frequency response characteristics to noise power can be obtained. Furthermore, by applying correction values ​​for each frequency of both to the measurement values ​​of the interference power measuring device 100, the measurement values ​​of the interference power measuring device as defined in "CISPR14-1" can be estimated. Any bandwidth deficiencies between measurement points can be interpolated as appropriate. Furthermore, the values ​​obtained using this method may be corrected for each frequency using a trained model generated by machine learning such as deep learning, that is, using so-called "AI (Artificial Intelligence) technology". The trained model takes the frequency-specific measurements from the interference power measuring device 100 as input and outputs correction values ​​that correct the frequency-specific measurements from the interference power measuring device 100. The trained model is trained using so-called "supervised learning".

[0097] In the embodiment described above, the case in which the analyzer 4 is equipped with a control unit 41 has been explained, but the embodiment is not limited to this. The control unit 41 may be configured as a "control device" separate from the analyzer 4. In this case, the "control device" can be configured as, for example, a personal computer, a tablet computer, a smartphone, etc.

[0098] The processor 41B of the control unit 41 may consist of a single processor or multiple processors. The processor 41B of the control unit 41 may also be hardware programmed to implement the corresponding functional unit. That is, the processor 41B may consist of, for example, an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0099] The operation steps shown in Figure 4 are divided according to the main processing content to facilitate understanding of the processing of the control unit 41, and the processing is not limited by the way the processing units are divided or the names of the processing units. Depending on the processing content, it may be further divided into more steps. Alternatively, it may be divided so that one step unit includes even more processing. Furthermore, the order of the steps may be changed as appropriate, as long as it does not impede the intent of this disclosure.

[0100] Since the embodiments described above are for illustrative purposes of the technology described herein, various modifications, substitutions, additions, omissions, etc., can be made within the claims or their equivalents.

[0101] (Note) Based on the above description of embodiments, the following technologies are disclosed.

[0102] (Technology 1) An interference wave power measuring device comprising: a power cable for connecting a power source and an electrical device; an antenna for receiving radiated noise from the power cable; a base material for fixing the power cable and the antenna; and an analyzer for determining the frequency characteristics of the radiated noise, wherein the power cable is fixed to the base material, and the antenna is fixed to the base material or the power cable so as to run along the power cable. According to this, since there is no need to configure a system that scans power cables to measure interference power, interference power can be measured with a simple configuration.

[0103] (Technology 2) The interference wave power measuring device according to Technology 1, wherein the power cable is folded back and fixed to the substrate. According to this method, the power cable is folded back and secured to the substrate, allowing for the measurement of interference power in a compact configuration.

[0104] (Technical 3) The interference wave power measuring device described in Technical 1, wherein the antenna is composed of lead wires. According to this, since the antenna is composed of lead wires, it can measure interference power with a simple configuration.

[0105] (Technical 4) An interference wave power measuring device according to any one of Technical 1 to 3, wherein the substrate includes a flat first substrate and a flat second substrate arranged substantially parallel to the first substrate, and the distance between the first substrate and the second substrate is greater than or equal to a predetermined distance. According to this, the substrate includes a flat first substrate and a flat second substrate arranged substantially parallel to the first substrate. Therefore, compared to the case where the substrate is made of a single flat component, interference wave power can be measured in a more compact configuration. Furthermore, since the distance between the first and second substrates is greater than a predetermined distance, by setting the second distance to an appropriate value, it is possible to prevent radiated noise generated from the power cable from interfering with each other and affecting the measurement, and to reduce measurement errors associated with folding and fixing the power cable to each of the first and second substrates.

[0106] (Technology 5) An interference wave power measuring device according to any one of Technology 1 to Technology 4, wherein the power cable, the antenna, and the substrate are housed in a housing that blocks external radiated noise. According to this method, the power cable, antenna, and substrate are housed in an enclosure that blocks external radiated noise, thus suppressing the effects of external radiated noise. Therefore, interference power can be measured with a simple process.

[0107] (Technical 6) An interference wave power measuring device according to any one of Technical 1 to 5, comprising an amplifier between the antenna and the analyzer for amplifying a signal corresponding to radiated noise received by the antenna. According to this method, the accuracy of measuring interference power can be improved by amplifying the signal corresponding to the radiated noise received by the antenna.

[0108] (Technical 7) The power supply is a stabilized power supply, and the interference wave power measuring device is as described in any one of Technical 1 to Technical 7. According to this, since the power supply is composed of a stabilized power supply, it is possible to suppress the decrease in the measurement accuracy of interference power due to the influence of noise input from the power supply.

[0109] (Technical 8) An interference power measurement device comprising: a power cable for connecting a power source and an electrical device; an antenna for receiving radiated noise from the power cable; a base material for fixing the power cable and the antenna; and an analyzer for determining the frequency characteristics of the radiated noise, wherein the power cable is fixed to the base material, the antenna is fixed to the base material or the power cable so as to be along the power cable, and the analyzer determines the frequency characteristics of the radiated noise from the power cable. According to this, it achieves the same effect as the interference wave power measuring device described in Technology 1.

[0110] (Technical 9) The interference wave power measurement method according to Technical 8, wherein the analyzer determines a first frequency characteristic of the radiated noise received by the antenna when the power supply of the electrical equipment is off, determines a second frequency characteristic of the radiated noise received by the antenna when the power supply of the electrical equipment is on, and determines the frequency characteristic of the radiated noise from the power cable by subtracting the first frequency characteristic from the second frequency characteristic. According to this method, the frequency characteristics of radiated noise from the power cable can be determined by subtracting the first frequency characteristic from the second frequency characteristic, thus allowing the effects of external radiated noise to be canceled out through calculation. Therefore, interference power can be accurately measured without the need to set up a special shielded room for the interference power measuring device.

[0111] (Technical 10) The interference wave power measuring device according to Technical 1, wherein the antenna and the power cable are covered with a shielding material. According to this method, the antenna and power cable are covered with shielding material, thus suppressing the effects of external radiated noise.

[0112] (Technical 11) The interference wave power measuring device according to Technical 1, wherein the antenna is hollow and the power cable is arranged in the hollow portion of the antenna. This allows the antenna and power cable to be placed together, making wiring work easier.

[0113] (Technical 12) The interference wave power measuring device according to Technical 1, wherein the antenna includes a plurality of antenna wires, and the plurality of antenna wires are arranged around the power cable. This allows the antenna and power cable to be placed together, making wiring work easier. [Industrial applicability]

[0114] As described above, the interference power measuring device and interference power measuring method relating to this disclosure can be used for measuring interference power with a simple configuration. [Explanation of Symbols]

[0115] 100 Interference wave power measuring device 11 Power cable 12 antennas 13. Ground wire 2 Base material 21 First base material 22 Second base material 23 Third base material 3 Amplifier 4 Analyzer 41 Control Unit 41A Memory 41B Processor 411 Control Program EP Electrical Equipment LA, LB distance LP predetermined distance LS standard length P11 One end P32 Other end PS power supply SL signal line SP frequency spectrum (frequency characteristics) SP1 First frequency spectrum (first frequency response) SP2 Second frequency spectrum (second frequency characteristics)

Claims

1. A power cable that connects the power source and electrical equipment, An antenna that receives radiated noise from the power cable, A base material for fixing the power cable and the antenna, An analyzer for determining the frequency characteristics of the aforementioned radiated noise, Equipped with, The power cable is fixed to the substrate, The antenna is fixed to the substrate or to the power cable so as to run along the power cable. Interference wave power measuring device.

2. The power cable is folded back and secured to the substrate. The interference wave power measuring device according to claim 1.

3. The aforementioned antenna is made up of lead wires. The interference wave power measuring device according to claim 1.

4. The substrate includes a flat first substrate and a flat second substrate arranged substantially parallel to the first substrate. The distance between the first substrate and the second substrate is greater than or equal to a predetermined distance. An interference wave power measuring device according to any one of claims 1 to 3.

5. The power cable, the antenna, and the substrate are housed in an enclosure that blocks external radiated noise. The interference wave power measuring device according to claim 1.

6. Between the antenna and the analyzer, there is an amplifier that amplifies the signal corresponding to the radiated noise received by the antenna. The interference wave power measuring device according to claim 1.

7. The aforementioned power supply consists of a stabilized power supply. The interference wave power measuring device according to claim 1.

8. A power cable that connects the power source and electrical equipment, An antenna that receives radiated noise from the power cable, A base material for fixing the power cable and the antenna, An analyzer for determining the frequency characteristics of the aforementioned radiated noise, A method for measuring interference wave power, comprising an interference wave power measuring device, The power cable is fixed to the substrate, The antenna is fixed to the base material or to the power cable so as to run along the power cable. The analyzer is a method for measuring interference power, which determines the frequency characteristics of radiated noise from the power cable.

9. The aforementioned analyzer is With the power to the aforementioned electrical equipment turned off, the first frequency characteristic of the radiated noise received by the antenna is determined. With the power of the aforementioned electrical equipment turned on, the second frequency characteristic of the radiated noise received by the antenna is determined. The frequency characteristics of the radiated noise from the power cable are determined by subtracting the first frequency characteristics from the second frequency characteristics. The method for measuring interference wave power according to claim 8.

Images