JP6586218B2 - Current measurement system - Google Patents

Description

The present invention relates to a current measuring system that calculates the current value based on the magnetic field generated by the current to be measured, in particular relating to the reduced thereby Ru current measuring system effects from adjacent bus bars.

  In recent years, energy management systems have been installed in homes and buildings with office areas to save energy and save energy. In the energy management system, a current sensor that is attached to a device in the system and detects a flowing current is used.

  As one of this type of current sensor, Patent Document 1 discloses a current sensor 900 that detects a three-phase current, reduces the influence of a current of a phase that is not a detection target, and improves detection accuracy. . The structure of the current sensor 900 disclosed in Patent Document 1 is shown in FIG.

  In FIG. 10, a current sensor 900 is provided with a plate-shaped rectangular U-phase bus bar 902a, V-phase bus bar 902b, and W-phase bus bar 902c, which are current paths of the three-phase inverter 911, on an electronic board 911a of the three-phase inverter 911. Each is connected to a target electric motor via a flexible U-phase cable 903a, V-phase cable 903b, and W-phase cable 903c. The U-phase current detector 904a, the V-phase current detector 904b, and the W-phase current detector 904c each have a current detection element 905a, a current detection element 905b, and a current detection element 905c that detect magnetic flux, and are attached to the electronic board 911a. ing.

  The U-phase current detector 904a detects the magnetic flux generated by the flow of the U-phase current with the current detection element 905a so as to detect the current flowing through the U-phase bus bar 902a with the detection target phase as the U-phase. The direction and the sensing surface of the current detection element 905a are parallel to each other, and are mounted on the electronic substrate 911a so as to be positioned in the vicinity of the U-phase bus bar 902a. Similarly, the V-phase current detector 904b has the detection target phase as the V phase, and the W-phase current detector 904c has the detection target phase as the W phase, and the positional relationship between the U-phase current detector 904a and the U-phase bus bar 902a is the same. It is mounted on the electronic substrate 911a so as to be appropriately positioned. Here, since the U-phase current detector 904a to the W-phase current detector 904c do not have a magnetic iron core, they are small and lightweight, easy to mount, downsizing of the apparatus, high density mounting, and reduction in assembly man-hours. , Effective in reducing costs.

If the current sensor having the configuration as this, the position of each phase bus bar and the current detector is known in advance, it can be removed by calculating the influence of the other phases, precisely by suppressing a decrease in current detection accuracy Current detection can be performed.

JP 2006-162309 A

  However, when the current sensor 900 disclosed in Patent Document 1 is applied to a general current sensor, there are the following problems. In the current sensor 900, it is known in advance that each of the current detectors 904a to 904c has another current detector at an adjacent position. Therefore, it is possible to easily remove the current component that is not detected for each of the current detectors 904a to 904c and obtain the detection target current.

  However, in the case of a device that does not know whether there is another current detector in the position adjacent to the current detector, there is a problem that it is difficult to easily obtain a current component that is not detected for each current detector. there were.

The present invention, such has been made in view of the drawbacks inherent in the prior art, its object has a current sensor multiple, easily detected current value of the current sensor to be detected can be corrected current measurement system I will provide a.

  In order to solve this problem, the current measurement system of the present invention has its own ID information and is installed in each of a plurality of bus bars through which current flows, and the detection result of the current sensor is transmitted as a whole. A control device and a bus line connecting the plurality of current sensors and the overall control device, and each of the current sensors transmits / receives the ID information to / from another adjacent current sensor. In addition, the ID information of the adjacent current sensor is transmitted to the overall control device together with the detection result, and the overall control device detects the current detection value of each current sensor as the current detection of the adjacent current sensor. It has the feature of correcting based on the value.

Since the current measurement system configured as described above determines each current sensor based on the ID information of each current sensor, the current sensor adjacent to the current sensor to be detected can be easily determined and detected. Since the current detection value of the target current sensor is corrected based on the current detection value of the adjacent current sensor, the current detection value of the detection target current sensor can be corrected easily and accurately.
In the current measurement system configured as described above, it is preferable that how much the current flowing through the bus bar to be corrected changes in advance when a unit current flows through each of the adjacent bus bars.
The plurality of current sensors preferably include wiring boards connected to each other, and the wiring boards are provided with a plurality of magnetic sensor elements so as to surround each of the bus bars.

Since the current measurement system of the present invention determines each current sensor based on the ID information of each current sensor, the current sensor adjacent to the current sensor to be detected can be easily determined and the current to be detected can be determined. Since the detected current value of the sensor is corrected based on the detected current value of the adjacent current sensor, the detected current value of the current sensor to be detected can be corrected easily and accurately.

It is a perspective view which shows the external appearance of a current sensor. It is an elevational view showing the relationship between the current sensor and the adjacent current sensor. It is an elevation view which shows the structure in a current sensor. It is an elevational view showing the configuration of the first detection means and the second detection means. FIG. 4 is a detailed view and a cross-sectional view showing the relationship between the first detection means and the first adjacent current sensor. It is a detailed view and sectional drawing which show the relationship between a 2nd detection means and a 2nd adjacent current sensor. It is an elevation view when the conductive pattern of the first detection means is formed of a resistor. It is a perspective view which shows the external appearance of an electric current measurement system. It is an elevation view showing the configuration of the current measurement system It is a perspective view which shows the external appearance of the current sensor which concerns on a prior art example.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In this specification, unless otherwise specified, the X1 side of each drawing is described as the right side, the X2 side as the left side, the Y1 side as the back side, the Y2 side as the near side, the Z1 side as the upper side, and the Z2 side as the lower side. To do.

  The configuration and operation of the current sensor 100 according to the first embodiment will be described with reference to FIGS. The current sensor 100 is a current sensor that is mounted on a distribution board in a home or factory and detects a current value of a current flowing through the distribution board for control and monitoring.

  FIG. 1 is a perspective view showing an appearance of the current sensor 100, and FIG. 2 is an elevation view showing a relationship of the current sensor 100 with an adjacent current sensor. FIG. 3 is an elevation view showing a configuration in the current sensor 100. FIG. 4 is a block diagram showing the configuration of the first detection means 10 and the second detection means 20. 3 and 4 are shown with the case 9 removed.

  A plurality of bus bars are arranged in parallel in a distribution board installed in a home or the like, and a current sensor 100 is attached to these bus bars. As shown in FIG. 1, the current sensor 100 has a U shape, can be fixed to a bus bar 35 having a circular cross section, which is a current path through which the current A10 to be measured flows, and has a bus bar 35 extending in the Y1-Y2 direction. Attached to straddle. The bus bar 35 is formed of a metal having good conductivity such as copper and is covered with an insulating film (not shown). The current sensor 100 has a case 9 formed of an insulating member such as a synthetic resin, and a configuration for detecting a current flowing through the bus bar 35 is incorporated in the case 9.

  In the adjacent portion of the current sensor 100, as shown in FIG. 2, there is a possibility that the first adjacent bus bar 36 through which the current A31 flows is arranged on the right side of the bus bar 35 through which the measured current A10 flows. Further, there is a possibility that the second adjacent bus bar 37 through which the current A32 flows is arranged on the left side of the bus bar 35. In that case, another current sensor is attached adjacent to the current sensor 100. That is, as shown in FIG. 2, the first adjacent current sensor 31 is attached to the right side of the current sensor 100, and the second adjacent current sensor 32 is attached to the left side of the current sensor 100. When the current sensor 100 is attached to the rightmost side or the leftmost side in the distribution board, one of the first adjacent current sensor 31 or the second adjacent current sensor 32 is not attached.

  As shown in FIG. 3, the wiring board 7 is attached in the case 9 of the current sensor 100, and the control means 3 is disposed on the wiring board 7 so as to surround the bus bar 35. A plurality of magnetic sensor elements 5 are provided. The plurality of magnetic sensor elements 5 are connected to the control means 3.

  The current sensor 100 is a magnetic proportional current sensor, and detects a magnetic field induced by the current A10 to be measured by a plurality of magnetic sensor elements 5 disposed on the wiring board 7. The detection result is sent to the control means 3, and the control means 3 calculates the current value of the measured current A10 based on the voltage output corresponding to the induced magnetic field generated by the measured current A10. The magnetic sensor element 5 is line-symmetric with respect to the vertical direction and the horizontal direction, and is disposed at a two-fold symmetrical position that overlaps when rotated 180 degrees. For this reason, the influence of the uniform magnetic field is offset, there is no shield, and even if the magnetic sensor is exposed to geomagnetism or the like, it can be measured accurately.

  However, as shown in FIG. 2, a plurality of bus bars are arranged in parallel in the distribution board, and the first adjacent bus bar 36 and / or the second adjacent bar are arranged on the right side and the left side of the bus bar 35 through which the measured current A10 flows. A bus bar 37 may be provided. Therefore, the current sensor 100 is affected by the current flowing through the first adjacent bus bar 36 and / or the second adjacent bus bar 37, that is, the magnetic field generated around these adjacent bus bars. Therefore, it is necessary to correct the influence of the magnetic field generated around these adjacent bus bars.

  In general, the influence from the adjacent bus bar can be calculated from the value of the current flowing in the adjacent bus bar and the degree of influence from the adjacent bus bar. Therefore, in order to correct the influence from the adjacent bus bar, it is necessary to satisfy the following three conditions. The first condition is that the positions of the bus bar to be detected and the adjacent bus bar are fixed, that is, the distance between the bus bar to be detected and the adjacent bus bar is known, and the second condition is The degree of influence from the adjacent bus bar is known in advance. The third condition is that the current value flowing in the adjacent bus bar can be obtained. It is assumed that each current sensor including adjacent current sensors is created with the same specifications.

  Among the above three conditions, the first condition can be obtained because it is determined in advance by the specifications of the distribution board including the positions of the current sensors and bus bars arranged in the distribution board. The distance between the current sensors is necessarily the distance between the bus bars.

  Of the three conditions, the second condition can be calculated in advance if the first condition is known. For example, when a unit current, for example, 1 A (ampere) flows through the first adjacent bus bar 36 and the second adjacent bus bar 37, how much the current flowing through the detection target bus bar 35 changes is calculated in advance. it can. The calculation method is well known and will be omitted.

  Therefore, if the third condition among the above three conditions can be satisfied, the influence of the magnetic field generated around the adjacent bus bar can be corrected.

  In the current sensor 100 according to the first embodiment of the present invention, in order to obtain the third condition, that is, the current value flowing through the first adjacent bus bar 36 and the second adjacent bus bar 37, the first detection means 10 and the second detection Means 20 are provided.

  As shown in FIG. 3, the first detection means 10 is attached to one side (right side) of the wiring board 7. The first detection means 10 is provided to detect the first adjacent current sensor 31 that may be adjacently installed on one side of the wiring board 7. The second detection means 20 is attached to the other side (left side) of the wiring board 7. The second detection means 20 is provided to detect the second adjacent current sensor 32 that may be adjacently installed on the other side of the wiring board 7. The first detection means 10 and the second detection means 20 are connected to the control means 3.

  The control means 3 is composed of an integrated circuit, and is provided for calculating the current value of the current to be measured A10 as described above and determining the presence or absence of the first adjacent current sensor 31 and the second adjacent current sensor 32. The control means 3 can be connected to the first adjacent current sensor 31 and the second adjacent current sensor 32 via the first detection means 10 and the second detection means 20.

  As shown in FIG. 4, the first detection means 10 includes a first spring contact 11 and a first conductive pattern 12 respectively connected to the control means 3, and the second detection means 20 is connected to the control means 3, respectively. The second spring contact 21 and the second conductive pattern 22 are formed. The first spring contact 11 and the second conductive pattern 22 are provided on the same straight line L1, and the second spring contact 21 and the first conductive pattern 12 are provided on the same straight line L2.

  Next, the relationship between the 1st detection means 10 and the 2nd detection means 20, and the 1st adjacent current sensor 31 and the 2nd adjacent current sensor 32 is demonstrated in detail using FIG.5 and FIG.6.

  FIG. 5A is a detailed view showing the relationship between the first detection means 10 and the first adjacent current sensor 31, and FIG. 5B is a view of the first detection means 10 shown in FIG. 5A. It is sectional drawing seen from the -B line. FIG. 6A is a detailed view showing the relationship between the second detection means 20 and the second adjacent current sensor 32, and FIG. 6B is a view taken along the line C-C shown in FIG. FIG. 5 shows the upper right part of the current sensor 100 and the upper left part of the first adjacent current sensor 31, and FIG. 6 shows the upper left part of the current sensor 100 and the upper part of the second adjacent current sensor 32. The left part of is shown.

  The first spring contact 11 of the first detection means 10 shown in FIG. 5A is made of an elastic metal, and extends from one side (right side) of the wiring board 7 toward the first adjacent current sensor 31. As shown in FIG. 5 (b), it has a contact 11a at the tip. The first conductive pattern 12 is a conductive pattern formed of copper foil or the like on the wiring board 7 and is provided near the edge on one side of the wiring board 7 above the first spring contact 11. Yes.

  On the other hand, the second spring contact 21 of the second detection means 20 shown in FIG. 6A is formed of an elastic metal, like the first spring contact 11, and the other side (left side) of the wiring board 7. ) To the second adjacent current sensor 32, and as shown in FIG. 6B, has a contact 21a at the tip. Similarly to the first conductive pattern 12, the second conductive pattern 22 is a conductive pattern formed of copper foil or the like on the wiring board 7, and is below the second spring contact 21 and on the other side of the wiring board 7. It is provided near the side edge.

  When the first adjacent current sensor 31 is attached to the first adjacent bus bar 36 shown in FIG. 2, as shown in FIG. 5B, the contact 11 a of the first spring contact 11 of the first detection means 10 is The first adjacent current sensor 31 is provided in contact with the first adjacent current sensor conductive pattern 31b. As a result, the control means 3 of the current sensor 100 and the first adjacent current sensor control means 31c of the first adjacent current sensor 31 are connected. That is, the control unit 3 and the first adjacent current sensor control unit 31 c are brought into conduction through the first detection unit 10.

  Similarly, the first adjacent current sensor spring contact 31 a provided in the first adjacent current sensor 31 contacts the first conductive pattern 12 of the first detection means 10. As a result, the control means 3 of the current sensor 100 and the first adjacent current sensor control means 31c of the first adjacent current sensor 31 are connected. That is, the control unit 3 and the first adjacent current sensor control unit 31 c are brought into conduction through the first detection unit 10. Therefore, it is possible to determine that the first adjacent current sensor 31 is installed by detecting the conduction between the first detection unit and the first adjacent current sensor 31 by the control unit 3.

  Conversely, when the first adjacent current sensor 31 is not installed, the control means 3 and the first adjacent current sensor control means 31c are not conducted via the first detection means 10. Therefore, it is possible to detect whether or not the first adjacent current sensor 31 is installed only by detecting the presence or absence of conduction in the first detection means 10.

  Further, by connecting the control means 3 of the current sensor 100 and the first adjacent current sensor control means 31c of the first adjacent current sensor 31, communication is performed between the control means 3 and the first adjacent current sensor control means 31c. Can be performed. In the current sensor 100, the first spring contact 11 side of the first detection means 10 is a transmission side, and the first conductive pattern 12 side is a reception side. The first spring contact 11 side can be the receiving side, and the first conductive pattern 12 side can be the transmitting side.

  On the other hand, when the second adjacent current sensor 32 is attached to the second adjacent bus bar 37 shown in FIG. 2, as shown in FIG. 6B, the contact 21 a of the second spring contact 21 of the second detection means 20. Is in contact with the second adjacent current sensor conductive pattern 32 b provided in the second adjacent current sensor 32. As a result, the control means 3 of the current sensor 100 and the second adjacent current sensor control means 32c of the second adjacent current sensor 32 are connected. That is, the control unit 3 and the second adjacent current sensor control unit 32 c are brought into conduction through the second detection unit 20.

  Similarly, the second adjacent current sensor spring contact 32 a provided in the second adjacent current sensor 32 contacts the second conductive pattern 22 of the second detection means 20. As a result, the control means 3 of the current sensor 100 and the second adjacent current sensor control means 32c of the second adjacent current sensor 32 are connected. That is, the control unit 3 and the second adjacent current sensor control unit 32 c are brought into conduction through the second detection unit 20.

  Conversely, when the second adjacent current sensor 32 is not installed, the control means 3 and the second adjacent current sensor control means 32c are not conducted via the second detection means 20. Therefore, similarly to the case of the first adjacent current sensor 31, it is possible to detect whether the second adjacent current sensor 32 is installed only by detecting the presence or absence of conduction in the second detection means 20.

  Further, the control means 3 of the current sensor 100 and the second adjacent current sensor control means 32c of the second adjacent current sensor 32 are connected to communicate between the control means 3 and the second adjacent current sensor control means 32c. Can be performed. In the current sensor 100, the second spring contact 21 side of the second detection means 20 is a transmission side, and the second conductive pattern 22 side is a reception side. When the first spring contact 11 side of the first detecting means 10 is the receiving side and the first conductive pattern 12 side is the transmitting side, the second spring contact 21 side is the receiving side, and the second conductive The pattern 22 side is the transmission side.

  Therefore, in the current sensor 100 of the first embodiment, the control means 3 is provided in the first adjacent current sensor spring contact 31a and the first detection means 10 of the first adjacent current sensor 31 shown in FIG. The detection value of the current A31 of the first adjacent bus bar 36 detected by the first adjacent current sensor 31 is received via the first conductive pattern 12. Then, the current detection value of the measured current A10 flowing in the current sensor 100 itself via the first spring contact 11 provided in the first detection means 10 and the first adjacent current sensor conductive pattern 31b of the first adjacent current sensor 31. Is transmitted to the first adjacent current sensor 31.

  Further, the control means 3 is connected to the second adjacent current sensor spring contact 32a of the second adjacent current sensor 32 and the second conductive pattern 22 provided in the second detection means 20 shown in FIG. The detection value of the current A32 of the second adjacent bus bar 37 detected by the two adjacent current sensor 32 is received. Then, the current detection value of the measured current A10 flowing in the current sensor 100 itself through the second spring contact 21 provided in the second detection means 20 and the second adjacent current sensor conductive pattern 32b of the second adjacent current sensor 32. Is transmitted to the second adjacent current sensor 32.

  As a result, the control means 3 of the current sensor 100 corrects the detected current value of the current sensor 100 based on the detected value of the current A31 by the first adjacent current sensor and / or the detected value of the current A32 by the second adjacent current sensor. be able to.

  By the way, the description has been made on the assumption that the first adjacent current sensor 31 is present on the right side of the current sensor 100 and the second adjacent current sensor 32 is present on the left side. When it is attached to the rightmost side or the leftmost side in the distribution board, one of the first adjacent current sensor 31 or the second adjacent current sensor 32 is not attached. In that case, since there is no conduction in the 1st detection means 10 or the 2nd detection means 20, it turns out that the 1st adjacent current sensor 31 or the 2nd adjacent current sensor 32 is not attached.

[Modification of First Embodiment]
Next, a current sensor 110, which is a modification of the first embodiment of the present invention, will be described with reference to FIGS. Similar to the current sensor 100, the current sensor 110 is a current sensor that is mounted on a distribution board in a home or factory and detects a current flowing through the distribution board for control or monitoring.

  FIG. 7 is an elevation view showing a part of the configuration in the current sensor 110. The only difference between the current sensor 110 and the current sensor 100 is that the members of the conductive pattern forming the first conductive pattern 12 and the second conductive pattern 22 are different, and the other configurations are the same. Therefore, the same reference numerals are assigned to the same parts. Also, description of common parts is omitted.

  In the current sensor 100 described above, it is necessary that the three conditions are satisfied in order to be able to correct the influence from the adjacent bus bar described above. However, when the positions of the detection target bus bar and the adjacent bus bar are not satisfied among the three conditions, that is, the detection target bus bar 35 and the first adjacent bus bar 36 or the second adjacent bus bar 37 are not satisfied. If the distance is not clear, it must be detected. If the distance between the bus bar to be detected and the adjacent bus bar is known, the degree of influence from the adjacent bus bar under the second condition is known in advance.

  In the current sensor 110, the first detection means 10 and the second detection means 20 can be used to determine the distance between the bus bar 35 to be detected, the first adjacent bus bar 36, and the second adjacent bus bar 37. The first adjacent current sensor 31 and the second adjacent current sensor 32 attached to the first adjacent bus bar 36 and the second adjacent bus bar 37 are assumed to have the same specifications as the current sensor 110.

  Specifically, the first conductive pattern 12 in the first detection means 10 and the second conductive pattern 22 in the second detection means 20 shown in FIG. 7 are formed of the resistor 12a and the resistor 22a, respectively. That is, a predetermined resistance value is provided between both ends of the first conductive pattern 12 and the second conductive pattern 22 provided in the current sensor 110. In the first adjacent current sensor 31 and the second adjacent current sensor 32 as well, the first adjacent current sensor conductive pattern 31b and the second adjacent current sensor conductive pattern 32b are formed of resistors.

  Therefore, when the first adjacent current sensor 31 is attached to the right side of the current sensor 110, the contact 11a of the first spring contact 11 of the current sensor 110 is connected to the first adjacent current sensor 31 as shown in FIG. The first adjacent current sensor conductive pattern 31b is in contact with any position in the left-right direction within the resistor. Further, the contact point of the first adjacent current sensor spring contact 31 a of the first adjacent current sensor 31 is also in contact with any position in the left-right direction in the first conductive pattern 12 of the current sensor 110.

  Therefore, as shown in FIGS. 5A and 5B, the first spring contact 11 is disposed between the control unit 3 of the current sensor 110 and the first adjacent current sensor control unit 31 c of the first adjacent current sensor 31. A certain resistance value is obtained through the contact 11a and a part of the first adjacent current sensor conductive pattern 31b or through a contact of the first adjacent current sensor spring contact 31a and a part of the first conductive pattern 12. Will have. Therefore, by measuring the resistance value between the control means 3 and the first adjacent current sensor control means 31c, the distance between the current sensor 110 and the first adjacent current sensor 31, in other words, the bus bar 35 and the first adjacent current sensor control means 31c. The distance between the adjacent bus bars 36 can be detected. The same applies to the distance between the current sensor 110 and the second adjacent current sensor 32, that is, the distance between the bus bar 35 and the second adjacent bus bar 37.

  As a result, by knowing the distance between the bus bar 35 and the first adjacent bus bar 36 and the distance between the bus bar 35 and the second adjacent bus bar 37, the above-described influence from the adjacent bus bar can be corrected. Of the three conditions, the first condition is satisfied. If the first condition is satisfied, the degree of influence of the second condition from the first adjacent bus bar 36 and the second adjacent bus bar 37 can be accurately grasped.

  The third condition out of the three conditions for making it possible to correct the influence from the adjacent bus bar described above, that is, obtaining the current value flowing through the adjacent bus bar is equivalent to the case of the current sensor 100. is there. Therefore, even when the distance between the bus bar 35 to be detected and the first adjacent bus bar 36 or the bus bar 35 and the second adjacent bus bar 37 is not clear, the current sensor 110 can be used for the current detection value of the current A10 to be measured. The influence of the magnetic field caused by the first adjacent bus bar 36 or the second adjacent bus bar 37 can be corrected.

  As described above, the current sensor 100 detects the first adjacent current sensor 31 and / or the second adjacent current sensor 32 only by detecting the presence or absence of conduction in the first detection means 10 and the second detection means 20. Therefore, it is possible to easily determine whether there is another current sensor at the adjacent position.

  Further, since the first spring contact 11 and the second conductive pattern 22 are provided on the same straight line, and the second spring contact 21 and the first conductive pattern 12 are provided on the same straight line, the current sensor It can be reliably determined whether there is another current sensor in the adjacent position on one side or the other side of 100 itself.

  Further, since the current detection value of the measured current A10 is corrected based on the detected value of the current A31 by the first adjacent current sensor and / or the detected value of the current A32 by the second adjacent current sensor, the current of the measured current A10 The detected value can be accurately corrected.

  Further, since the current first conductive pattern 12 and the second conductive pattern 22 of the current sensor 110 are formed by the resistor 12a and the resistor 22a, respectively, the resistance value between the control means 3 and the first adjacent current sensor control means 31c. And the distance between the adjacent current sensors can be determined by detecting the resistance value between the control means 3 and the second adjacent current sensor control means 32c. As a result, the first adjacent bus bar 36 and / or the second adjacent bus bar The degree of influence 37 can be accurately understood. As a result, the current detection value can be corrected with high accuracy.

[Second Embodiment]
Hereinafter, the configuration and operation of the current measurement system 200 according to the second embodiment of the present invention will be described with reference to FIGS. 8 and 9. The current measurement system 200 is a current measurement system that is mounted on a distribution board in a home or factory and detects a current flowing through the distribution board for control and monitoring.

  FIG. 8 is a perspective view showing the external appearance of the current measurement system 200, and FIG. 9 is an elevation view showing the configuration of the current measurement system 200. In FIG. 9, the case 69 is omitted.

  As shown in FIG. 8, a plurality of bus bars 71 through which a current to be measured A70 flows are arranged on a distribution board in a home or factory. The current measurement system 200 includes a current sensor 61 having its own ID information and installed on each bus bar 71, an overall control device 73 to which detection results of the plurality of current sensors 61 are transmitted, and the plurality of current sensors 61. And a bus line 77 for connecting the control device 73 and the overall control device 73. Each current sensor 61 and the bus line 77 are connected by a connector 68 attached to each current sensor 61. Each current sensor 61 is housed in a case 69. The case 69 may cover all of the current sensors 61, or may be configured separately so as to individually cover each of the current sensors 61.

  The plurality of bus bars 71 are attached in parallel to each other at equal intervals, and each current sensor 61 is installed so as to straddle each bus bar 71. The overall control device 73 is installed at a position away from the plurality of current sensors 61 and controls all the current sensors 61 via the bus line 77. Each current sensor 61 can communicate with another current sensor 61 via a bus line 77. Each current sensor 61 is configured to be able to detect a measured current A70 flowing through the bus bar 71 to which each current sensor 61 is attached.

  As shown in FIG. 9, a wiring board 67 is attached in the case 69 of the current measurement system 200, and a plurality of magnetic sensor elements 65 are arranged on the wiring board 67 so as to surround each bus bar 71. Yes. The wiring board 67 may be a connected board on which a plurality of current sensors 61 are formed, or may be configured separately for each current sensor 61. An individual control device 63 is disposed above the wiring board 67 and is connected to each magnetic sensor element 65. Each individual control device 63 is connected to the overall control device 73 via a connector 68 and a bus line 77 attached to the uppermost portion of the wiring board 67.

  Each current sensor 61 is a magnetic proportional current sensor, and detects a magnetic field induced by the current A70 to be measured by a plurality of magnetic sensor elements 65 disposed on the wiring board 67. The detection result is sent to the individual control means 63 in each current sensor 61, and the individual control means 63 determines the current value of the measured current A70 based on the voltage output corresponding to the induced magnetic field generated by the measured current A70. Is calculated.

  However, as shown in FIG. 8, a plurality of bus bars 71 are arranged in parallel in the distribution board, and other bus bars 71 are arranged adjacent to each current sensor 61. Therefore, each current sensor 61 is influenced by the current flowing through the adjacent bus bars 71, that is, by the magnetic field generated around these adjacent bus bars 7. Therefore, it becomes necessary to correct the influence of the magnetic field generated around these adjacent bus bars 71.

  In each current sensor 61 of the current measurement system 200, as described in the explanation of the current sensor 100, the position of the bus bar 71 to be corrected and the adjacent bus bar 71 is fixed in order to correct the influence from the adjacent bus bar 71. The second condition that the degree of influence from the adjacent bus bar 71 on the detection target bus bar 71 is grasped in advance, and the current value flowing through the adjacent bus bar 71 can be obtained. It was necessary to obtain the third condition that

  Among the above three conditions, the first condition can be obtained because it is determined in advance according to the specifications of the distribution board. The second condition can be calculated in advance because the first condition is known. For example, when a unit current, for example, 1 A (ampere) flows in each adjacent bus bar 71, it can be calculated in advance how much the current flowing in the correction target bus bar 71 changes.

  Therefore, if the third condition among the above three conditions is satisfied, the influence of the magnetic field generated around the adjacent bus bar can be corrected.

  In the current measurement system 200 according to the second embodiment of the present invention, the third condition, that is, the acquisition of the current value flowing in the adjacent bus bar 71 can be obtained by transmitting and receiving the ID information of each current sensor 61 to each other. did.

  Each current sensor 61 is connected between the first detection means 10 and the second detection means 20 and the first detection means and the second detection means of the adjacent current sensors by NFC (Near Field Communication). The ID information of the adjacent current sensor 61 is transmitted to the overall control device 73 together with the detection result detected by itself. Then, the overall control device 73 determines each current sensor 61 based on each ID information, and corrects the current detection value of each current sensor 61 based on the current detection value of each adjacent current sensor 61.

  In addition, as a method of mutually transmitting / receiving ID information to / from other adjacent current sensors 61, as in the current sensor 100 described above, a method of using two detection means having a spring contact and a conductive pattern. Alternatively, a method of mutually transmitting and receiving via the bus line 77 may be used.

  Thus, in the current measurement system 200, each current sensor 61 is determined based on the ID information of each current sensor 61. Therefore, it is possible to easily determine the current sensor 61 adjacent to the current sensor 61 to be detected. At the same time, since the current detection value of the current sensor 61 to be detected is corrected based on the current detection value of the adjacent current sensor 61, the current detection value of the current sensor 61 to be detected can be corrected easily and accurately. Can do.

As described above, since the current measurement system of the present invention determines each current sensor based on the ID information of each current sensor, it can easily determine the current sensor adjacent to the current sensor to be detected. At the same time, since the current detection value of the current sensor to be detected is corrected based on the current detection value of the adjacent current sensor, the current detection value of the current sensor to be detected can be corrected easily and accurately.

  As described above, the current sensor 100, the current sensor 110, and the current measurement system 200 according to the embodiment of the present invention have been described. However, the present invention is not limited to the above-described embodiment, and does not depart from the gist. It is possible to implement with various modifications.

3 Control means 5 Magnetic sensor element
7 Wiring board 7a One side 7b The other side 9 Case
10 first detection means 11 first spring contact 11a contact 12 first conductive pattern 12a resistor 20 second detection means 21 second spring contact 21a contact 22 second conductive pattern 22a resistor 31 first adjacent current sensor 31a first adjacent Current sensor spring contact 31b First adjacent current sensor conductive pattern 31c First adjacent current sensor control means 32 Second adjacent current sensor 32a Second adjacent current sensor spring contact 32b Second adjacent current sensor conductive pattern 32c Second adjacent current sensor control means 35 Bus bar 36 1st adjacent bus bar 37 2nd adjacent bus bar 61 Current sensor 63 Individual control device
65 Magnetic sensor element 67 Wiring board 68 Connector 69 Case 71 Bus bar 73 Overall control device 77 Bus line 100 Current sensor 110 Current sensor 200 Current measurement system A10 Current to be measured A31 Current A32 Current A70 Current to be measured

Claims (3)

A current sensor installed in each of a plurality of bus bars through which current flows, a plurality of current sensors, and a plurality of the current control devices; A bus line to be connected,
Each of the current sensors exchanges the ID information with another adjacent current sensor, and transmits the ID information of the adjacent current sensor to the overall control device together with the detection result. ,
The overall control device corrects a current detection value of each of the current sensors based on a current detection value of the adjacent current sensor.   The current measurement system according to claim 1, wherein when a unit current flows through each of the adjacent bus bars, how much the current flowing through the bus bar to be corrected changes is calculated in advance.   The plurality of current sensors include wiring boards connected to each other, and a plurality of magnetic sensor elements are disposed on the wiring board so as to surround each of the bus bars. The current measurement system according to claim 2.

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