JP6043669B2 - Distribution board - Google Patents

Description

  The present invention relates to a distribution board having a function of measuring a branch current flowing in a branch breaker and measuring power consumption of each branch circuit.

  2. Description of the Related Art Conventionally, there is a distribution board equipped with a device that measures the current flowing through each branch circuit and measures the power consumption of each branch circuit. For example, in Patent Document 1, a branch current sensor board having a sensor for measuring the current of each branch circuit in a distribution board, a measurement control unit that determines a measured current value or calculates power, a current abnormality An alarm unit for informing the occurrence of the occurrence of the problem is arranged, a threshold is set, and when the branch current exceeds the threshold, a display notification or an alarm is issued by the light emission of the LED, thereby enabling fine power management.

JP 2008-136279 A

However, since the configuration of Patent Document 1 is a configuration in which the branch current sensor substrate individually converts the current information detected by the current sensor and transmits it to the measurement control unit, the configuration of the branch current sensor substrate is complicated. It was expensive.
In addition, since branch current is detected using an air-core coil, it is necessary to insert the branch bar into the air-core coil, which is troublesome to assemble and replace.

  Therefore, in view of such problems, the present invention provides a distribution board that can transmit branch current information detected by a current sensor as an analog signal and that does not require the operation of inserting a branch bar into the current sensor. It is aimed.

In order to solve the above-mentioned problems, the invention of claim 1 is directed to a main breaker and a plurality of main bars arranged on the secondary side of the main breaker arranged on at least one side of both sides thereof. A plurality of current sensors for detecting branch currents flowing through the individual branch breakers. The distribution board is configured to connect the primary terminal of the branch breaker to the main bar and branch the electric circuit from the main bar. And a communication measurement unit that is connected to the current sensor unit via a connector and calculates and outputs power consumption based on current information detected by the current sensor. The bar is formed with a branch bar for measuring the current flowing to the branch breaker, and a current sensor is disposed in the vicinity of the branch bar, from the GMR element to the connector. That the signal line pattern on the substrate, is arranged held between the voltage line pattern constant DC voltage is applied from the communication measuring unit, characterized by comprising.
According to this configuration, since the signal line pattern from the current sensor to the connector is sandwiched between voltage line patterns to which a constant DC voltage is applied, the detection current information transmitted from the current sensor can be a simple circuit. Even in the case of an analog signal, it is possible to satisfactorily transmit current information that is detected with less noise. And since a GMR element that detects the magnetic force around the branch circuit and obtains branch current information is used as a current sensor, the troublesome work of inserting the branch bar into the current sensor is not required, and the current sensor is installed with simple operation. it can.

According to a second aspect of the present invention, in the configuration according to the first aspect, the signal line pattern and the voltage line pattern are formed in the inner layer portion of the substrate, and at least one surface of both surfaces of the substrate on which the signal line pattern is disposed is It is characterized by being covered with an earth pattern.
According to this configuration, the signal line pattern is surrounded by the voltage line from the left and right, and at least one surface in the vertical direction is covered with the ground pattern, so that noise can be further prevented from entering.

According to a third aspect of the present invention, in the configuration according to the first or second aspect, the DC voltage applied to the voltage line pattern is a reference voltage output from the GMR element.
According to this configuration, since the reference voltage of the GMR element is supplied by the voltage line pattern, it is not necessary to provide a separate voltage line for the reference voltage.

  According to the present invention, since the signal line pattern from the current sensor to the connector is sandwiched between voltage line patterns to which a constant DC voltage is applied, the detected current information transmitted from the current sensor can be a simple circuit. Even in the case of an analog signal, it is possible to satisfactorily transmit current information that is detected with less noise. And since a GMR element that detects the magnetic force around the branch circuit and obtains branch current information is used as a current sensor, the troublesome work of inserting the branch bar into the current sensor is not required, and the current sensor is installed with simple operation. it can.

It is a lineblock diagram showing an example of a distribution board concerning the present invention. It is a circuit block diagram of a communication control unit. The current sensor unit is shown, (a) is a plan view, (b) is a front view. The current sensor board | substrate is shown, (a) is a top view, (b) is a front view. A main bar is shown, (a) is a top view and (b) is a front view. It is explanatory drawing which showed typically the relationship between the signal wire | line of a current sensor, and a power wire. It is sectional explanatory drawing of the signal wire pattern formation part of the circuit board which comprises a current sensor unit. It is a perspective view of the distribution board which assembled | attached the main circuit breaker, the main bar, and the current sensor unit to the distribution board. It is an A section enlarged view. It is the enlarged view which extracted the current sensor unit of FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of a distribution board according to the present invention, wherein 1 is a main breaker, 2 is a branch breaker, 3 is a main bar connected to the secondary side of the main breaker 1 via a connection conductor, 4 is a current sensor unit for measuring a branch current flowing through each branch breaker 2, and 5 is a communication measurement unit for outputting measured data to the outside. The main bar 3 is disposed on the left and right sides in the center of the distribution board, and the branch breakers 2 are arranged adjacent to the main bar 3 in the vertical direction.
The current sensor unit 4 includes a current sensor board 41 for measuring the branch current and a sensor connection board 42 for transmitting the measured branch current information to the communication measurement unit 5 so as to overlap the main bar 3. is set up.

  FIG. 2 shows a circuit block diagram of the communication measurement unit 5. As shown in FIG. 2, the communication measurement unit 5 is connected to the main bar 3 to generate its own driving power and driving power for the current sensor unit 4, and voltage information of the main bar 3 from the power source 51. Is used to control the measurement voltage conversion unit 52 that generates voltage data for power calculation, the power measurement unit 53 that measures power based on the branch current information transmitted from the current sensor unit 4, and the communication measurement unit 5. A control CPU 54, an external communication IF 55 that outputs power information and the like measured by connecting to an external LAN are provided. Reference numeral 6 denotes a current transformer for measuring a current flowing through the main breaker 1.

FIG. 3 shows the current sensor unit 4, where (a) is a plan view and (b) is a front view. The current sensor unit 4 includes the current sensor substrate 41 and the sensor connection substrate 42 as described above. The current sensor substrate 41 has a comb-like portion 41b in which a plurality of cutouts 41a are formed at regular intervals, and a current sensor 43 is assembled to the side portion of each cutout 41a. The current sensor 43 uses an integrated GMR element (giant magnetoresistive element), and the detected current information is output as an analog signal.
A connector 45 for connecting to the communication measurement unit 5 is provided at the end of the sensor connection board 42.

  4A and 4B show the current sensor substrate 41 alone, where FIG. 4A is a plan view and FIG. 4B is a front view. Six GMR elements 43 are assembled on one substrate, and a connector 44 is provided on the back surface. The connector 44 is connected to a connector on the side of the sensor connection board 42 (not shown) so that both are coupled. At this time, the current sensor substrate 41 provided with the upward comb-shaped portion 41b and the current sensor substrate 41 provided with the downward comb-shaped portion 41b are attached to the sensor connection substrate 42, and the upward current sensor substrate 41 allows the single phase. One branch current of the two main bars 3 constituting the two voltage phases of the three-wire circuit is measured, and the branch current of the main bar 3 constituting the other voltage phase is measured by the downward current sensor substrate 41. Is measured.

  Note that the current sensor unit 4 in FIG. 3 is connected to a total of four current sensor substrates 41, two upward and two downward, and current information detected by each current sensor 43 is collected. Further, the plane shown in the plan view of FIG. 3A is installed with the current sensor unit 4 mounted on the distribution board facing forward and the front shown in FIG. 2B facing upward.

FIG. 5 shows the main bar 3, where (a) is a plan view and (b) is a front view. In the case of a single-phase three-wire circuit, the main bar 3 is composed of three pieces composed of two voltage phases and one neutral phase, and FIG. 5 shows the main bar 3 used for the voltage phase. . The main bar 3 is formed with connecting portions 31 for connecting the branch breakers 2 on both sides on the long side, and the main bar 3 used for the voltage phase is provided with a plurality of notches 3a only on one side. A branch bar 32 that flows only a branch current to the branch breaker 2 is formed.
An insertion portion 3b for inserting individual protrusions constituting the comb-shaped portion 41b of the current sensor substrate 41 is formed at the back of the notch 3a. On the other hand, a uniform end face connection portion 31 having no irregularities is formed on the other side portion.

  The branch bars 32 are formed at a pitch according to the width (installation interval) of the branch breaker 2, and the interval of the notches 41 a of the current sensor substrate 41 described above is formed to match this pitch. Thus, by inserting the individual protrusions of the comb-shaped portion 41b into the insertion portion 3b and meshing with each other, only the current flowing in the branch bar 32 out of the current flowing in the main bar 3, that is, the current flowing in the branch breaker 2 is caused by the current sensor 43. It is possible to measure.

  Of the main bars 3, the main bar 3 used for the voltage phase has a branch bar 32 formed on one side for measuring the current, but the main bar used for the neutral phase. Since no current measurement is required for No. 3, there is no branch bar 32, and both sides are formed with uniform end faces (not shown).

FIG. 6 schematically shows the configuration of signal lines formed in the current sensor unit 4 from the current sensor 43 to the communication measurement unit 5, L1 is a signal line extending from the current sensor 43, and L2 is a voltage line. Show. In FIG. 6, the number of signal lines L1 is two, but in reality, the signal lines L1 are provided for each current sensor 43, and the same number of signal lines L1 as the current sensors 43 are formed on the substrate.
Thus, the signal line L1 is patterned from each current sensor 43 to the connector 45, while the voltage line L2 is applied with a direct current of 3.3 V and is arranged in parallel so as to sandwich the signal line L1 from both sides. The voltage applied to the voltage line L2 is for supplying a reference voltage to each current sensor 43, and the power supply unit 51 of the communication measurement unit 5 generates a 3.3V voltage to connect the connector 45. The voltage lines L <b> 2 are connected to the current sensor 43.

FIG. 7 is a cross-sectional explanatory view of signal line forming portions of the current sensor substrate 41 and the sensor connection substrate 42. As shown in FIG. 7, the current sensor substrate 41 and the sensor connection substrate 42 are formed of multilayer substrates, L1 and the voltage line L2 are patterned on the inner layer of the substrate P. The pattern of the signal line L1 and the pattern of the voltage line L2 are formed on the same plane with a gap t of, for example, 100 micrometers.
Then, both surfaces of the substrate P on which the signal lines L1 and the voltage lines L2 are formed are covered with the ground pattern G. That is, the left and right direction of the signal line L1 is sandwiched between the voltage lines L2, and the vertical direction is covered with the ground pattern.

  FIG. 8 shows a perspective view of a distribution board in which the main breaker 1 and one main bar 3 arranged at the deepest part of the distribution board and the current sensor unit 4 are assembled to the distribution board case. FIG. FIG. As shown in FIGS. 8 and 9, the current sensor substrate 41 of the current sensor unit 4 is arranged so as to intersect with the branch bar 32 formed on the main bar 3 by being inserted into the insertion portion 3 b from the orthogonal direction. . In addition, FIG. 8 has shown the figure which looked at the distribution board from diagonally lower right.

  Here, FIG. 10 shows an enlarged view of the current sensor unit 4 shown in FIG. 8, and a perspective view seen from above the distribution board. As shown in FIG. 10, the current sensor unit 4 is mounted while being protected by an insulating cover 46 so that electrical contact with the main bar 3 does not occur.

  In the distribution board configured as described above, the branch current and power are measured as follows. The power measurement unit 53 of the communication measurement unit 5 has a measurement circuit corresponding to each current sensor 43, obtains branch current information from each current sensor 43, and measures power consumption for each branch circuit. The measured power consumption information is output to the control CPU 54, and the control CPU 54 outputs data to an external device such as a personal computer via the external communication IF 55.

Thus, since the pattern of the signal line L1 from the current sensor 43 to the connector 45 is sandwiched between the pattern of the voltage line L2 to which a constant DC voltage is applied, a guard pattern is formed by the voltage line L2. Even if the detected current information transmitted from the current sensor 43 is an analog signal that requires a simple circuit, it is possible to satisfactorily transmit the detected current information because it is difficult for noise to ride. Since the GMR element that detects the magnetic force around the branch circuit and obtains the branch current information is used as the current sensor, the troublesome work of inserting the branch bar 32 into the current sensor 43 is not required, and the current sensor can be operated with simple operation. 43 can be installed.
Further, since the pattern of the signal line L1 is further covered with the ground pattern G in the vertical direction, noise is less likely to enter.
Furthermore, since the reference voltage of the GMR element which is the current sensor 43 is supplied by the voltage line pattern, no separate wiring for supplying the reference voltage is required.

  In addition, although the said embodiment demonstrated the structure of the single-phase three-wire type electric circuit, the structure of this invention is the distribution board targeted for a single-phase two-wire type electric circuit, or the electric power distribution for three-phase electric circuit. It can also be applied to the board. Further, the solid ground pattern formed on the surface of the substrate P at the portion where the signal line L1 and the voltage line L2 are disposed may be only on one surface.

  1 ... Main trunk breaker 2 .... Branch breaker 3 .... Main trunk bar 4 .... Current sensor unit 5 ... Communication measuring unit 32 ... Branch bar 43 ... Current sensor (GMR element) 44 ... -Connector, 51-Power supply unit, 53-Power measurement unit, 54-Control CPU, L1-Signal line, L2-Voltage line, P-Circuit board, G-Ground pattern

Claims (3)

A main breaker and a plurality of branch breakers arranged on at least one side of both sides of the main bar disposed on the secondary side of the main breaker, and a primary terminal of the branch breaker A distribution board for connecting the main bar to the main bar and branching the electric circuit from the main bar,
A current sensor unit in which a plurality of current sensors for detecting branch currents flowing through the individual branch breakers are mounted on a common substrate;
A communication measurement unit that is connected to the current sensor unit via a connector and calculates and outputs power consumption based on current information detected by the current sensor;
A branch bar for measuring a current flowing to the branch breaker is formed in the main bar, and the current sensor is a GMR element disposed in proximity to the branch bar,
A distribution board comprising: a signal line pattern on a substrate extending from the GMR element to the connector sandwiched by a voltage line pattern to which a constant DC voltage is applied from the communication measurement unit. The signal line pattern and the voltage line pattern are formed in an inner layer portion of the substrate, and at least one surface of both surfaces of the substrate on which the signal line pattern is disposed is covered with a ground pattern. Item 1. The distribution board according to Item 1. 3. The distribution board according to claim 1, wherein the DC voltage applied to the voltage line pattern is a reference voltage output from the GMR element.

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