JP5859273B2 - Distribution board - Google Patents

Description

  The present invention relates to a distribution board, and more particularly, to a distribution board including a current sensor that detects a current value on a secondary side of a branch breaker.

  Conventionally, a distribution board that measures a current value of a branch system by attaching a current sensor to the distribution board and monitors a current value of the branch system is known. For example, Patent Document 1 discloses a distribution board including a plurality of branch breakers, a current sensor provided in each branch breaker, and a server that calculates the amount of power used from the output value of each current sensor. .

  Patent Document 2 discloses a distribution board including a plurality of branch breakers and a plurality of current sensors connected to the branch breakers via conductive bars.

JP 2011-120428 A JP 2011-36050 A

  Although the distribution board which monitors the electric current value of a branch system by utilizing a current sensor like the distribution board disclosed by patent documents 1 and 2 has existed conventionally, it is a coil type current sensor usually used Has a large size and is provided with a peripheral circuit that performs power calculation for each branch breaker, so the distribution board cannot be downsized.

  Accordingly, an object of the present invention is to provide a distribution board that can be miniaturized.

A distribution board for solving the above-mentioned problem is branched on the secondary side of the main breaker, and a plurality of branch breakers configured to be connectable to the main breaker, and a predetermined number of the plurality of branch breakers a plurality of current sensors mounted on each of the branch breakers, based on values detected by the respective current sensors, viewed contains an arithmetic unit, a for calculating the power use state of the load side of each branch breakers, The current sensor includes a current sensor substrate and an IC chip. The current sensor substrate supports a primary conductor having a U-shaped current path and a signal processing IC having a built-in magnetoelectric conversion element. A signal terminal side member having a support portion and a lead terminal, and the current path is disposed close to the support portion so as not to overlap the support portion in plan view, and the support path in side view. And a current sensor substrate having a different height, and the IC chip includes a magnetoelectric conversion element that is disposed on the support and detects a magnetic flux generated from a current flowing through the current path. The magnetic sensor is used .

  Examples of the current sensor include a shunt resistor, a coil-type current sensor, and a current sensor using a magnetic sensor. The current sensor may be capable of measuring a direct current and an alternating current. In this case, a more suitable distribution board is configured such that detection of the offset voltage of the DC component becomes possible. Alternatively, the current sensor may be configured using a magnetic sensor. In this case, there is no power loss caused by the shunt resistor, and no heat is generated, which is more preferable. Alternatively, the current sensor may be incorporated in the branch breaker. In this case, the distribution board can be reduced in size.

  The branch breaker may include a switch, and the current sensor may be attached so as to be orthogonal to the operation direction of the switch.

  According to the present invention, the distribution board can be downsized.

It is a figure which shows the structural example of the electricity distribution panel in 1st Embodiment. It is a figure which shows the structural example of the current sensor in 1st Embodiment. It is a figure which shows an example of the side surface and cross section in the current sensor of FIG. It is a figure which shows the example of schematic structure of the electricity distribution panel in 2nd Embodiment. It is a figure which shows the structural example of the branch breaker in 2nd Embodiment. In 2nd Embodiment, it is a figure which shows an example of the positional relationship of each current sensor in a some branch breaker. In 2nd Embodiment, it is a figure which shows the example of installation of a magnetic shield when a magnetic shield is given to a branch breaker. It is a perspective view which shows the example of the branch breaker to which the magnetic shield was given. It is a figure which shows the modification 1 of a current sensor. It is sectional drawing of the current sensor along the XX line of FIG. It is a figure which shows the modification 2 of a current sensor. It is a figure which shows an example of the side surface and cross section in the current sensor of FIG. It is a figure which shows the modification 3 of a current sensor.

<First Embodiment>
Hereinafter, an embodiment of a distribution board of the present invention will be described with reference to the drawings. The distribution board 100 according to the embodiment is a distribution board provided in a home or the like, for example, for calculating the power usage amount of the branch system from the current value of the branch system.

[Configuration of distribution board]
FIG. 1 is a diagram illustrating a configuration example of a distribution board 100 according to the first embodiment.

  As shown in FIG. 1, this distribution board 100 is divided into a main breaker 11 and a plurality of branch breakers 13 a, 13 b,..., Branched on the secondary side of the main breaker 11 and connected to the main breaker 11. 13n, a plurality of current sensors 14a, 14b, ..., 14n connected to the load side (secondary side) of each branch breaker 13a, 13b, ..., 13n, and a plurality of current sensors 14a, 14b, .., 14n are provided with arithmetic units 15a,..., 15g for inputting the output value of any one of the current sensors.

  1 shows a case where the current sensors 13a, 13b,..., 13n are provided corresponding to the branch breakers 13a, 13b,. For example, a current sensor may be provided corresponding to a part of the total number of branch breakers).

  In FIG. 1, the primary side of the main breaker 11 is supplied with power via a cable 10, and the secondary side is connected to a plurality of branch breakers 13 a, 13 b,.

  Each branch breaker 13a, 13b,..., 13n includes a switch for switching on or off the electric circuit. Each switch of the branch breakers 13a, 13b,..., 13n is normally in an on state, and is connected to a device (not shown) connected to each load side of the branch breakers 13a, 13b,. It is designed to supply power. Thereby, a load current flows as a total current of the currents flowing in the devices connected to the load sides of the branch breakers 13a, 13b, ..., 13n. In addition, as an apparatus, there exist a lighting fixture, a refrigerator, an air conditioner, a washing machine etc., for example.

  Each of the current sensors 14a, 14b,..., 14n can detect the load current values of the branch breakers 13a, 13b,. As each of the current sensors 14a, 14b,..., 14n, for example, various types of current sensors such as a shunt resistor, a coil-type current sensor, and a current sensor using a magnetic sensor can be applied. For example, it is preferable to apply a current sensor that uses a magnetic sensor that can detect both direct current and alternating current and generates little heat and loss of power. Among these, it is preferable to use a current sensor that uses a magnetic sensor that does not have a magnetic core, because it is easy to reduce the size of the distribution board. The configuration of each of the current sensors 14a, 14b, ..., 14n will be described in detail later.

  Further, the current sensors 14a, 14b,..., 14n are connected to any of the arithmetic devices 15a,..., 15g, and the arithmetic devices 15a,. A value corresponding to the current is input. Thereby, the number of arithmetic devices and current sensors is not the same, and the number of arithmetic devices (in FIG. 1, for example, seven arithmetic devices 15a,..., 15g) is equal to the number of current sensors (in FIG. 1, For example, the number of current sensors 14a, 14b,. The ratio of the number of arithmetic devices and the number of current sensors is not limited to the above example of 1: 2. In the ratio of the number of arithmetic devices to the number of current sensors, when the ratio of the number of arithmetic devices is 1, the ratio of the number of current sensors may be 3 or more. In this case, for example, if the ratio of the number of current sensors is 4 or more, there is an effect that the scale of the peripheral circuit and the area of the printed circuit board can be greatly reduced.

  In FIG. 1, only the connection destinations of some of the current sensors 14a, 14b,..., 14n are displayed. That is, the arithmetic device 15a is connected to, for example, the current sensors 14a and 14b, and the arithmetic device 15g is connected to, for example, the current sensor 14n.

[Configuration of arithmetic unit]
Each of the arithmetic units 15a,..., 15g is based on the value detected by each of the current sensors 14a, 14b,..., 14n, and the power on the load side of each branch breaker 13a, 13b,. Calculate the usage status of. Examples of power usage include instantaneous power, integrated power consumption, electricity charges, and load current values.

  Each of the arithmetic devices 15a,..., 15g is configured by, for example, an LSI (Large Scale Integration) and includes an AC / DC circuit, a memory, a processor, and the like.

  The memory may hold temperature characteristic data of the current sensor, for example, and the processor may correct the output value of the current sensor based on the temperature characteristic data. In this case, since the output value of the current sensor is corrected, each arithmetic device 15a,..., 15g can obtain a more accurate power usage state and obtain a preferable result.

  In FIG. 1, the case where each of the plurality of arithmetic devices monitors (monitors) signals from the plurality of current sensors has been described, but for example, one arithmetic device monitors signals from the plurality of current sensors. You may comprise. This configuration may be adopted, and a highly accurate correction circuit may be provided in the arithmetic device. In this case, since it is not necessary to provide a high-precision correction circuit for each current sensor, total distribution panel system optimization and downsizing of the distribution panel system can be realized.

  For one arithmetic device to read signals from a plurality of current sensors, for example, a multiplexer may be used to exchange the signals by serial communication, or a plurality of analog signals may be processed in parallel. .

  With respect to the signal from the current sensor, it is possible to perform power calculation with high accuracy if the signal is digitized by an AD converter built in the calculation device and subjected to temperature correction or the like.

  In the present embodiment, each of the arithmetic devices 15a,..., 15g supplies power to, for example, a connected current sensor. By adopting such a configuration, the arithmetic devices 15a,..., 15g perform power calculations in conjunction with power supply fluctuations of the current sensors 14a, 14b,. Even when power fluctuations to 14b,..., 14n occur, more accurate power calculation is possible. The power supply to the current sensors 14a, 14b,..., 14n is not limited to the configuration shown in FIG. 1, and a power supply circuit (such as a regulator) that is not affected by peripheral noise is provided. It is also possible to apply a configuration performed from

[Configuration of current sensor]
Next, the configuration of the current sensors 14a, 14b,..., 14n according to the present embodiment will be described with reference to FIGS. In the present embodiment, the current sensors 14a, 14b,..., 14n use magnetic sensors and will be described by taking an example of a configuration without a magnetic core, but other current sensors may be applied. Is possible. However, the current sensors 14a, 14b,..., 14n of the present embodiment are current sensors that do not cause power loss or heat generation, and are preferable because the size of the distribution board can be minimized.

  The size of the distribution board has been reduced year by year, and the width of one branch breaker has been reduced to about 16 mm. In the case of the conventional coil type current sensor, since the length of one side exceeds 20 mm, the coil type current sensor cannot be installed in the branch breaker. On the other hand, in the case of the current sensors 14a, 14b,..., 14n of the present embodiment, the thickness can be set to about 0.5 to 3 mm, for example, so that the current sensors 14a, 14b,. .., 14n can be installed. Therefore, it is possible to greatly contribute to downsizing of the entire distribution board 100.

  In the following description, each current sensor is referred to as the current sensor 200 in the description common to each of the current sensors 14a, 14b,.

  FIG. 2 is a diagram illustrating a configuration example of the current sensor 200. 4A is a side view of the current sensor 200 and FIG. 2B is a cross-sectional view taken along line IIIB-IIIB in FIG. 2.

  As shown in FIG. 2, the current sensor 200 includes a primary conductor 210 having a U-shaped current path 210A, a support portion 220A for supporting a magnetoelectric conversion element 230A such as a Hall element, and a signal terminal side having a lead terminal 220B. The member 220 and the IC chip 230 having the magnetoelectric conversion element 230A that is disposed on the support portion 220A and detects magnetic flux generated from the current flowing through the current path 210A are provided. The current sensor 200 is formed by molding the primary conductor 210, the signal terminal side member 220, and the IC chip 230 with the resin 240. A portion excluding the IC chip 230 and the resin 240 is a current sensor substrate.

  The current path 210A is disposed close to the support portion 220A so as not to overlap the support portion 220A in plan view. Further, as can be seen from the side view of FIG. 3A and the cross-sectional view of FIG. 3B, the current path 210A is different in height from the support portion 220A in the side view.

  When the current to be measured flows through the current path 210A, the magnetic flux density is increased near the center inside the U-shaped current path 210A and the current detection sensitivity is improved. Therefore, the magnetoelectric conversion element 230A has the U of the current path 210A in plan view. It is arranged inside the letter shape. Further, the IC chip 230 protrudes from the support portion 220A in a side view and overlaps with the current path 210A in a plan view.

  In the current sensor 200, the signal terminal side member 220 has a stepped portion 220C between the support portion 220A and the lead terminal 220B. For example, the step part 220 </ b> C of about 20 to 100 μm can be provided by forming the signal terminal side member 220. Thereby, a clearance is obtained between the current path 210 </ b> A and the IC chip 230. This clearance guarantees insulation between the primary conductor 210 and the IC chip 230, and allows a high breakdown voltage to be maintained inside the package. When the stepped portion 220C does not exist, the conductive path 210A of the primary conductor 210 and the IC chip 230 come into contact with each other, and even if an insulating sheet is pasted on the back surface of the IC chip 230, the dielectric strength is low and the dielectric breakdown is likely to occur. End up. As an improvement measure, an insulating sheet may be pasted on the primary conductor 210 in advance.

  In the current sensor 200, since the primary conductor 210 and the back surface of the IC chip 210 connected to 0 V of the power source used in the signal processing circuit face each other, the IC circuit formed on the surface of the IC chip 210 is primary. The structure is shielded from the conductor 210, and voltage noise contained in the current source to be measured flowing through the primary conductor 210 can be effectively cut off without using a new component, thereby reducing the size of the distribution board. This is a more suitable current sensor.

  Further, the current sensor 200 outputs not only the output proportional to the current to be measured flowing in the current path but also the ambient temperature signal of the current sensor 200, so that each arithmetic device 15 a,. Therefore, the power characteristic can be calculated with high accuracy. When the current values flowing through the branch breakers 13a, 13b,..., 13n are different, the internal temperature of the current sensor 200 provided in each branch breaker 13a, 13b,. The difference is different as a result. Compared with the case where uniform temperature correction is taken into consideration for each current sensor 200, a highly accurate power calculation can be realized by obtaining the ambient temperature signal of each current sensor 200.

  As described above, according to the distribution board 100 of the present embodiment, each arithmetic device 15a,..., 15g is connected to one of the current sensors 14a, 14b,. Based on the output value of the connected current sensor, the power usage state of each branch system is calculated. That is, the arithmetic device is provided to be smaller than the number of current sensors. Therefore, since the number of arithmetic units can be reduced, the distribution board 100 can be downsized.

Second Embodiment
Hereinafter, a second embodiment will be described. The distribution board 100A in the present embodiment is different from that of the first embodiment in that the current sensor is incorporated in the branch breaker.

  Below, the structure of the distribution board in this embodiment is demonstrated centering on the difference with the thing of 1st Embodiment. First, the structure of the branch breaker in this embodiment is demonstrated with reference to FIG.

FIG. 4 is a diagram illustrating a configuration example of a distribution board 100A according to the second embodiment.
As in the case shown in FIG. 1, the distribution board 100 </ b> A branches from the main breaker 11 and a plurality of branch breakers 16 a, 16 b,. , 16n, a plurality of current sensors 17a, 17b, ..., 17n connected to the load side of the branch breakers 16a, 16b, ..., 16n, and current sensors 17a, 17b, ..., 17n Arithmetic devices 15a,..., 15g for inputting an output value of any one of the current sensors.

  On the other hand, unlike the one shown in FIG. 1, in the distribution board 100A of the present embodiment, the current sensors 17a, 17b,..., 17n are incorporated in the branch breakers 16a, 16b,. .

[Branch breaker configuration]
Next, the configuration of the branch breakers 16a, 16b,..., 16n in the present embodiment will be described with reference to FIG.

  FIG. 5 is a diagram illustrating a configuration example of the branch breaker 16a when the branch breaker 16a is viewed from the front. In addition, the structure of each branch breaker 16a, 16b, ..., 16n is the same.

  As shown in FIG. 5, the branch breaker 16a includes a printed circuit board 201, a switch 211 connected by the cable 12, and a current sensor 17a. The printed circuit board 201 is provided with a printed wiring 202, and the current sensor 17 a is connected to the switch 211 via the printed wiring 202.

  In this branch breaker 16 a, the switch 211 is arranged so that the operation direction of the switch is the front, and the printed circuit board 201 and the current sensor 17 a are arranged so as to be orthogonal to the operation direction of the switch 211. That is, the printed circuit board 201 and the current sensor 17a are provided on the side surface of the branch breaker 17a. Thereby, the width W of the branch breaker 16a can be reduced. In the present embodiment, as an example, W is approximately 16 mm.

  In FIG. 5, H represents the distance from the bottom surface of the printed circuit board 201 to the exposed surface of the printed wiring 202. In the present embodiment, as an example, H is approximately 5 mm. The values of W and H described above can be changed.

[Positional relationship of each current sensor in the branch breaker]
Next, the positional relationship between the current sensors 17a, 17b,..., 17n in the branch breakers 16a, 16b,.

  FIG. 6 is a diagram showing an example of the positional relationship between the current sensors 17a, 17b,..., 17n in the branch breakers 16a, 16b,.

  In the example of FIG. 6, branch breakers 16a, 16b,..., 16n are connected, and the current sensors 17a, 17b, 17c,. Has been placed. For example, the deviation between the centers of the current sensors 17b and 17c is the distance d. Thereby, it becomes possible to reduce the influence of the leakage magnetic flux which arises from an adjacent branch breaker. In this embodiment, when the distance d is set to 5 mm or more, for example, the influence of the leakage magnetic flux can be almost ignored from the simulation result.

  Further, the branch breakers 16a, 16b,..., 16n may be magnetically shielded.

  FIG. 7 is a view showing an installation example of a magnetic shield when a magnetic shield is applied to the branch breaker 16a. FIG. 7A illustrates a case where the magnetic shield 203 is applied to one side surface of the frame of the branch breaker 16a. (B) shows the case where the magnetic shields 203 and 204 are provided on both sides of the frame of the branch breaker 16a, (c) shows the case where the magnetic shield 205 is provided so as to cover the current sensor 17a, and (d) shows The case where the magnetic shield 206 is applied to the entire inner surface of the frame of the branch breaker 16a is shown. The branch breakers 16b,..., 16n can be magnetically shielded in the same manner as the branch breaker 16a.

  As shown in FIG. 7, in the branch breaker 16a, the above-described magnetic shields 203, 204, 205, and 206 are provided by attaching, for example, a magnetic shield sheet to part or all of the frame frame. In addition to the magnetic shield sheet, it may be composed of a thin magnetic plate such as iron or silicon steel plate. Note that the position of the magnetic shield sheet is not limited to the above-described example as long as the magnetic noise of disturbance is not generated in the current sensor.

  FIG. 8 is a perspective view showing an example of the branch breaker 16a provided with a magnetic shield. FIG. 8A shows a case where the magnetic shield 203 is provided on one side surface of the frame of the branch breaker 16a, and FIG. The case where the magnetic shields 203 and 204 are provided on both side surfaces of the frame of the branch breaker 16a is shown. 8A shows an example displayed in FIG. 7A, and FIG. 8B corresponds to the example displayed in FIG. 7B.

  As shown in FIG. 8, in the branch breaker 16a, the shield effect is acquired by providing the magnetic shields 203 and 204 on one side surface or both side surfaces of the frame frame.

  As described above, according to the distribution board 100A of the present embodiment, the current sensor and the magnetic shield can be provided in the branch breaker.

Next, modifications 1, 2, and 3 of the current sensor 200 will be described.
(Modification 1)
FIG. 9A is a diagram illustrating a first modification of the current sensor 200 of FIG. A current sensor 600 shown in FIG. 9A is the same as the current sensor 200 except for the IC chip 630. When the IC chip 630 is arranged on the support portion 220A, the first magnetoelectric conversion element 630A is arranged inside the U-shape of the current path 210A in plan view, and the second magnetoelectric conversion element 630B is It is designed to be disposed outside the U-shape of the current path 210A and in a position close to the current path 210A. FIG. 10 is a cross-sectional view taken along line XX in FIG. The magnetic flux density at the position of the first magnetoelectric conversion element 630A generated by the current flowing through the primary conductor 210 is B1s, and the magnetic flux density at the position of the second magnetoelectric conversion element 630B is B2s. If the magnetic flux densities generated by the external magnetic noise are B1n and B2n, the outputs Vo1 and Vo2 of the first magnetoelectric conversion element 630A and the second magnetoelectric conversion element 630B are
Vo1 = k1 × (B1s + B1n) + Vu1
Vo2 = k2 × (−B2s + B2n) + Vu2
It becomes. Here, k1 and k2 are sensitivity coefficients of the respective magnetoelectric conversion elements, and Vu1 and Vu2 are offset values of the respective magnetoelectric conversion elements.

Here, it is assumed that variations in the characteristics of both magnetoelectric transducers are extremely small, and k1 = k2 = k and Vu1 = Vu2 hold.
Since the distance between both magnetoelectric conversion elements is short, the value of Vo1−Vo2 when approximated to B1n = B2n is the output voltage Vo.
Vo = Vo1−Vo2 = k × (B1s + B2s)
Thus, noise due to the external magnetic field disappears, and a larger signal is obtained than in the case of only the first magnetoelectric conversion element 630A inside the U-shape, leading to an improvement in sensitivity of the current sensor.

FIG. 9B shows an example in which three magnetoelectric conversion elements are used as another modification of the current sensor 200 according to the first embodiment. The current sensor 700 is the same as the current sensor 200 except for the IC chip 730. When the IC chip 730 is disposed on the support portion 220A, the first magnetoelectric conversion element 730A is disposed inside the U-shape of the current path 210A in plan view, and the second magnetoelectric conversion element 730B and the second magnetoelectric conversion element 730B The third magnetoelectric conversion element 730C is designed to be disposed outside the U-shaped ends of the current path 210A and in a position close to the current path 210A. The magnetic flux density at the position of the third magnetoelectric conversion element 730C generated by the current flowing through the primary conductor 210 is B3s, and the magnetic flux density generated at the position of the third magnetoelectric conversion element 730C by external magnetic noise is B3n. .
Here, it is assumed that k1 = k2 = k3 = k and Vu1 = Vu2 = Vu3 are satisfied, and the distance between the three magnetoelectric conversion elements is close, so that B1n = B2n = B3n is approximate. If the value of Vo1- (Vo2 + Vo3) / 2 is the output voltage Vo,
Vo = Vo1− (Vo2 + Vo3) / 2 = k × (B1s + (B2s + B3s) / 2)
As with the two cases, noise due to the external magnetic field disappears and the sensitivity of the current sensor is improved, and even when the positional relationship between the primary conductor 210 and the IC chip 730 is displaced in the arrangement direction of the three magnetoelectric transducers. Thus, the fluctuation level of the output Vo can be suppressed as much as possible.

  In addition, if the current path can be configured to surround the magnetoelectric conversion element, a U-shaped current path that is one form of the U-shaped current path may be used for the current path 210A.

(Modification 2)
FIG. 11 is a diagram illustrating a second modification of the current sensor 200. The current sensor 800 shown in FIG. 11 is different from the current sensor 200 shown in FIG. 3 in that, instead of the IC chip 230 protruding from the support portion 220A in side view, the support portion 820A of the signal terminal side member 220 is notched 820A. , And the current path 210A protrudes into the notch 820A ′ portion in plan view. Therefore, although the IC chip 230 does not protrude, the IC chip 230 and the current path 210A overlap in plan view. FIG. 12A shows a side view and FIG. 12B shows a cross-sectional view. Since the current path 210A having a different height in a side view as compared with the first embodiment protrudes into the notch 820A ′ in a plan view, a degree of freedom arises in the arrangement of the magnetoelectric conversion elements in the IC chip, and the IC Since the magnetoelectric conversion element can be disposed on the inner side of the chip, the influence on the offset due to the stress can be reduced. Further, since the bonding area between the support portion and the IC chip is increased, the IC chip can be supported more stably, and it can be said that the manufacturing process has a margin.

  As in the first embodiment, the IC chip 230 may be an IC chip 630 having two magnetoelectric conversion elements or an IC chip 730 having three magnetoelectric conversion elements.

(Modification 3)
FIG. 13 is a diagram illustrating a third modification of the current sensor 200. In the current sensor 300 shown in FIG. 13, unlike the current sensor 200 in FIG. 3, a magnetoelectric conversion element 330 </ b> A such as a Hall element is not included in the IC chip 330 and is provided separately. The current sensor 300 of this embodiment has a hybrid structure with an IC.

  The support portion 220A includes a first support portion 220A ′ inserted into the U-shaped opening 210C and a second support portion 220A ″ adjacent to the first support portion 220A ′ and not inserted into the opening portion 210C. The first support portion 220A ′ is provided with a magnetoelectric conversion element 330A that detects a magnetic flux induced from the current flowing through the current path 210A, and the second support portion 220A ″ has a magnetoelectric conversion element 330A. An IC chip 330 for processing the output signal from is disposed. The magnetoelectric conversion element 330A is disposed inside the U shape of the current path 210A in plan view.

  In the current sensor 300 of Modification 3, only the magnetoelectric conversion element 330A is arranged, the first support part 220A ′ inserted into the opening part 210C of the current path 210A, and the IC chip 330 for signal processing are arranged, and the opening It is divided into the second support portion 220A ″ that is not inserted into the portion 210C, and a highly sensitive compound semiconductor magnetic sensor such as InSb, InAs, or GaAs is used as the magnetoelectric conversion element 330A. As a result, the current flowing through the current path 210A Measurement accuracy can be improved.

  In addition, since only the magnetic field conversion element 330A, not the IC chip 330, needs to be inserted into the opening 210C, the U-shaped current path 210A can be made small and the overall length can be shortened. When the current path 210A is reduced in size, the magnetic field concentration inside the U-shape increases, so that the detection sensitivity of the current can be improved and the influence of heat generation can be reduced.

  In the current sensor 300 of Modification 3, the primary conductor 210 and the magnetoelectric conversion element 330A are not two-dimensionally overlapped when viewed from the top surface of the current sensor 300, and the interval between the primary conductor 210 and the magnetoelectric conversion element 330A is widened. Therefore, a higher breakdown voltage can be ensured for the primary conductor 210. In addition, since the IC chip 330 made of a fine process is further away from the primary conductor 210, the influence of noise generated from the primary conductor 210 can be reduced, and the influence of heat generation due to current flowing through the primary conductor 210 can be reduced. Therefore, reliability is further increased. Therefore, the current sensor 300 is a current sensor more suitable for realizing a small distribution board.

  As described above, the first and second embodiments and the first to third modifications have been described in detail. However, the specific configuration is not limited to the above-described example, and other design changes and other modifications can be made without departing from the scope of the present invention. Application to usage is also included.

  For example, although the current sensor 200 has been described with reference to a configuration capable of measuring a direct current and an alternating current, for example, it may be configured to be capable of measuring only a direct current or only an alternating current. Alternatively, the current sensor 200 may be configured using a magnetic sensor other than the Hall sensor.

  The distribution boards 100 and 100A have been described by taking the case where the main breaker 11 is included as an example, but may be configured without the main breaker 11.

11 trunk breaker 13a-13n, 16a-16n branch breaker 14a-14n, 17a-17n, 200, 300, 600 current sensor 15a-15g arithmetic device 100, 100A distribution board 210 primary conductor 210A current path 220 signal terminal side member 220A Support portion 220B Lead terminal 220C Stepped portion 230 IC chip 230A Magnetoelectric conversion element 630 IC chip

Claims (13)

A plurality of branch breakers configured to be branched on the secondary side of the main breaker and connectable to the main breaker;
Among the plurality of branch breakers, a plurality of current sensors attached to each of a predetermined number of branch breakers,
Based on the value detected by each current sensor, a computing device that computes the usage state of the power on the load side of each branch breaker;
Only including,
The current sensor includes a current sensor substrate and an IC chip,
The current sensor substrate includes a primary conductor having a U-shaped current path, a signal terminal side member having a support portion and a lead terminal for supporting a signal processing IC having a built-in magnetoelectric conversion element, and the current The path is disposed close to the support portion so as not to overlap the support portion in plan view, and has a current sensor substrate having a height different from that of the support portion in side view,
The IC chip includes a magnetoelectric conversion element that is disposed on the support portion and detects a magnetic flux generated from a current flowing through the current path.
The distribution board , wherein the current sensor is configured using a magnetic sensor . A plurality of branch breakers configured to be branched on the secondary side of the main breaker and connectable to the main breaker;
Among the plurality of branch breakers, a plurality of current sensors attached to each of a predetermined number of branch breakers,
Based on the value detected by each current sensor, a computing device that computes the usage state of the power on the load side of each branch breaker;
Including
The current sensor uses a compound semiconductor as a magnetoelectric conversion element and has a hybrid structure with a signal processing IC, and the current sensor substrate supports the primary conductor having a U-shaped current path and the magnetoelectric conversion element. And a signal terminal side member having a lead terminal and a second support part for supporting the signal processing IC, and the current path overlaps with the first support part in a plan view A current sensor substrate disposed in proximity to the first support so as not to have a magnetoelectric conversion element for detecting magnetic flux generated from a current flowing through the current path,
The current sensor panelboard you wherein <br/> that is configured using a magnetic sensor. The current sensor distribution board according to claim 1 or 2, characterized in that it is possible to measure the direct current and alternating current. Said current sensor, a distribution board according to any one of claims 1 and outputs also the ambient temperature signal 3.   The distribution board according to claim 1, wherein the current sensor is incorporated in the branch breaker.   6. The distribution board according to claim 5, wherein the branch breaker includes a switch, and the current sensor is attached so as to be orthogonal to an operation direction of the switch.   The distribution board according to any one of claims 1 to 6, wherein the current sensor has a thickness of 0.5 mm to 3 mm. The current sensor distribution board according to any one of claims 1 to 7, characterized in that no magnetic core. If the plurality of branch breakers are mounted by connecting, each current sensor in the branch breakers Adjacent claims 1, characterized in that the mounting position is arranged differently from each other according to any one of the 8 Distribution board. The distribution board according to any one of claims 1 to 9 , wherein the branch breaker is configured by a frame frame, and the frame frame is subjected to a magnetic shield process. The arithmetic unit, a distribution board according to any one of claims 1 to 10, characterized in that it comprises an AD converter circuit. The computing device includes a memory for holding the temperature characteristic data of said current sensor, based on the temperature characteristics data, to any of the claims 1 is configured to correct the output of the current sensor 11 The distribution board described. The arithmetic unit, a distribution board according to any one of claims 1 to 12 and supplying power to said current sensor.

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