JP5633917B2 - Current detection device and watt-hour meter using the same - Google Patents

Description

The present invention relates to a current detection device that detects the magnitude of a current flowing through a conductor by magnetoelectric conversion, and a watt-hour meter using the same.

2. Description of the Related Art Conventionally, current detection devices that detect load currents in general households, factories, and offices have become widespread. The current detection device includes a primary conductor that forms a coil that converts a load current into a magnetic field, and a magnetoelectric conversion unit that detects a magnetic field generated by the primary conductor that forms the coil.
(For example, Patent Document 1)

Japanese Patent Laid-Open No. 05-223849

Generally, a current detection device includes a primary conductor that forms a coil that converts a load current into a magnetic field, and a magnetoelectric conversion unit that detects a magnetic field generated by the primary conductor that forms the coil.

The magnetoelectric conversion unit is formed by a coil wound with a conducting wire. However, when a coil in which a conducting wire such as an enameled wire is wound around a core material is used, the manufacturing cost is high and the cost becomes high. On the other hand, although the coil using the printed wiring board in which the coil conducting wire is formed by the printed pattern can be configured at low cost, the coil is a so-called air-core coupling coil that does not have a magnetic core, and the output Since the signal level is small, it is necessary to increase the output signal level. To increase the output signal level of the coil, it is necessary to increase the number of coil turns, but since the coil is formed with a coil conductor in a printed pattern, when the number of coil turns is increased,
There is a problem that the printed wiring board becomes large.

In view of the above problems, an object of the present invention is to provide a current detector having a small coil with a high output level and having a coil conductor formed by a printed pattern, and a watt hour meter using the current detector.

In order to achieve the above object, a current detection device according to the present invention comprises:
To conduct current to be measured, the first conductive portion consisting of a substantially U-shaped plate-like metal conductor when viewed from the side, and, said first conductive portion and electrically connected to to the current to be measured the A loop-like structure comprising a second conductive part made of a substantially U-shaped plate-shaped metal conductor as viewed from the side, which is conducted in the opposite direction to the first conductive part, wherein the first conductive part A primary conductor that is a spring structure using elasticity by a material based on the bent portion of the second conductive portion and the bent portion of the second conductive portion;
A plurality of linear patterns printed wiring on at least two layers of the printed wiring layer printed wiring board of different printed wiring layer with, and, said the plurality of linear patterns are arranged obliquely, the different printed wiring layers A first coil portion and a second coil portion each having a plurality of through-holes for electrically conducting a plurality of linear patterns printed and wired on the first coil portion, outputting an electrical signal directly proportional to the magnetic field generated more first conductive portion and the second coil portion, the first coil portion I reverse wound der in the same number as that of said first coil portion electrically connected in series the second is of configured so that to output an electrical signal proportional to the magnetic field more generated in the conductive portion was magnetic-electric conversion unit,
An insulating sheet that electrically insulates the primary conductor and the magnetoelectric converter;
Equipped with,
The first coil portion and the second coil portion are geometrically congruent and form a shape that is symmetrical with respect to the central axis of the current flowing through the primary conductor, and each of the first coil portion and the second coil portion is disconnected for each number of turns. The total area is equal,
In order to prevent misalignment of the primary conductor, the magnetoelectric conversion part, and the insulating sheet on the side where the magnetoelectric conversion part is disposed at the bent part of the first conductive part and the bent part of the second conductive part. With a convex protrusion of
The magnetoelectric conversion unit and the insulating sheet are sandwiched and pressed inside the first conductive unit and the second conductive unit .

In order to achieve the above object, a power meter according to the present invention includes a current detection unit comprising a current detection device according to claim 1, for detecting a current of the system under measurement, and detects the voltage of said system under measurement from a voltage detector, and a signal according to the current of the system under measurement detected by the current detection unit, a signal according to the voltage of said system under measurement detected by the voltage detecting section and arithmetic data regarding electric energy And a power calculation unit .

ADVANTAGE OF THE INVENTION According to this invention, the electric current meter which has a coil with which the coil conducting wire is formed with the printed pattern with a small and high output level, and a watt hour meter using the same can be provided.

The perspective view which shows the electric current detection apparatus concerning Example 1 by this invention. The perspective view which shows the assembly of the electric current detection apparatus concerning Example 1 by this invention. The figure which shows the structure of the primary conductor of the electric current detection apparatus concerning Example 1 by this invention. The figure which shows the structure of the primary conductor of the electric current detection apparatus concerning Example 1 by this invention. Structures shown to view the magnetoelectric converting part according to a first embodiment of the present invention The figure which shows the electrical connection of the electric current detection apparatus concerning Example 1 by this invention. Block diagram showing the configuration of an embodiment 2 in accordance electric dynamometer according to the invention

Examples of the present invention will be described below.

[Example 1 ]
Per Example 1 of the current detection device according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a first embodiment of a current detection device according to the present invention.

In FIG. 1 , reference numeral 500 denotes a current detection device main body.

Reference numeral 510 denotes a primary conductor made of a conductive metal such as iron or copper, which conducts a load current and generates a magnetic field that is directly proportional to the load current.

Reference numeral 511 denotes an attachment hole provided in the primary conductor 510, to which a power supply side conductor (not shown) from a power supply that generates current is connected by a screw or the like.

Reference numeral 512 denotes a connection portion, which is a mounting hole provided in the primary conductor 510, and a load-side conductor (not shown) for supplying a current to the load is connected by a screw or the like.

Reference numeral 550 denotes a magnetoelectric conversion unit, which is composed of a printed wiring board or the like in which a coil is formed by a printed pattern. The magnetic field directly proportional to the load current flowing through the primary conductor 510 is further converted into a low-level electric signal corresponding to the magnetic field. Convert.

551 is an insulating sheet, which is composed of a non-conductive plastic film, etc.
The primary conductor 510 and the magnetoelectric converter 550 are electrically insulated.

FIG. 2 is a perspective view illustrating assembly of the current detection device main body 500 according to the first embodiment.

The current detection device main body 500 is configured by inserting the magnetoelectric conversion unit 550 and the insulating sheet 551 into the primary conductor 510 from the direction of arrow A. The primary conductor 510 is made by bending a single metal plate into a loop shape, has a spring structure, and can open the magnetoelectric conversion portion 550 and the insulating sheet 551 by opening in the arrow B direction.

3 and 4 are diagrams showing the detailed structure of the primary conductor 510. FIG.

Primary conductor 510 is made by a plate-like metal as shown in FIG. 3 is bent at dotted line.

Reference numeral 511 denotes an attachment hole provided in the primary conductor 510, to which a power supply side conductor (not shown) from a power supply that generates current is connected by a screw or the like.

Reference numeral 512 denotes a connection portion, which is a mounting hole provided in the primary conductor 510, and a load-side conductor (not shown) for supplying a current to the load is connected by a screw or the like.

513 is a first conductive part, 514 is a second conductive part, 515 is a third conductive part, 516 is a fourth conductive part,
Reference numeral 517 denotes a fifth conductive portion, and 518 denotes a sixth conductive portion that electrically connects the connecting portion 511 and the connecting portion 512. Also, between the first conductive part 513 and the second conductive part 514, between the second conductive part 514 and the third conductive part 515, between the fourth conductive part 516 and the fifth conductive part 517, and between the fifth conductive part 517 and Each of the sixth conductive portions 518 is bent into a valley fold. Note that the third conductive portion 515 and the fourth conductive portion 516 are electrically connected. Further, the bent portion 519 is bent into a valley fold with respect to the third conductive portion 515 and the fourth conductive portion 516. The primary conductor 510 subjected to the bending process has a shape as shown in FIG.

FIG. 4 shows the primary conductor 510 after being bent.

The primary conductor 510 is connected between the first conductive part 513 and the second conductive part 514, between the second conductive part 514 and the third conductive part 515, between the fourth conductive part 516 and the fifth conductive part 517, and between the fifth conductive part 514 and the fifth conductive part 517. It is bent into a valley fold between the portion 517 and the sixth conductive portion 518 to form a loop-like structure. In addition, the primary conductor 510 has a spring structure that uses the elasticity of the material based on the bent portions of the second conductive portion 514 and the third conductive portion 515, and the fifth conductive portion 517 and the fourth conductive portion 516, The magnetoelectric conversion unit 550 and the insulating sheet 551 are sandwiched and pressed. As shown in FIG. 2 , the magnetoelectric conversion unit 550 is inserted through the open gap between the third conductive unit 515 and the fourth conductive unit 516 and the first conductive unit 513 and the sixth conductive unit 518, and the primary conductor 510.

Reference numerals 520 and 521 denote protrusions, which are the second conductive portion 514 and the fifth conductive portion 5 by pressing or the like, respectively.
17 is formed. The projecting portions 520 and 521 are formed in a convex shape on the side where the magnetoelectric conversion portion 550 is disposed, and prevent displacement of the primary conductor 510, the magnetoelectric conversion portion 550 and the insulating sheet 551.

The bent portion 519 is configured to have such a width that the first conductive portion 513 and the sixth conductive portion 518 are not electrically connected via the bent portion 519 in a state where the magnetoelectric conversion portion 550 is disposed on the primary conductor 510. ing. Specifically, the width of the bent portion 519 is less than the width of the second conductive portion 514 and the fifth conductive portion 517.

FIG. 5 is a diagram showing a detailed structure of the magnetoelectric conversion unit 550.

The magnetoelectric conversion unit 550 is configured by a printed wiring board in which a coil is formed by a printing pattern. In FIG. 5 , the printed wiring pattern on the front surface is indicated by a solid line, and the printed wiring pattern on the back surface is indicated by a dotted line.

In FIG. 5 , reference numeral 601 denotes a substrate, which is made of a non-conductive glass epoxy material, phenol material, or the like, and serves as a base material for a printed wiring board of the magnetic field conversion unit 550.

Reference numeral 602 (inside the alternate long and short dash line) denotes a coil portion, which electrically connects a coil pattern formed of a linear pattern by printed wiring such as copper foil provided on the front and back surfaces of the substrate 601 and the coil pattern on the front and back surfaces. A magnetic field that is configured by a through hole and that is directly proportional to the load current converted by the first conductive portion 513 and the third conductive portion 515 of the primary conductor 510 is converted into a low-level electric signal corresponding to the magnetic field.

Reference numeral 603 (inside the alternate long and short dash line) denotes a coil portion that electrically connects a coil pattern formed of a linear pattern with printed wiring such as copper foil provided on the front and back surfaces of the substrate 601 and the coil pattern on the front and back surfaces. A magnetic field that is configured by a through hole and that is directly proportional to the load current converted by the fourth conductive portion 516 and the sixth conductive portion 518 of the primary conductor 510 is converted into a low-level electric signal corresponding to the magnetic field.

The coil part 602 and the coil part 603 are reversely wound. Further, the coil part 602 and the coil part 603 are electrically connected in series by a connection pattern 604.

Reference numerals 605a and 605b denote output terminals, which are configured by through holes attached to a conductive metal such as copper provided on the substrate 601, electrically connected to the coil portion 603, and the primary conductor 510. A low-level electrical signal that is directly proportional to the magnetic field generated by the load current flowing through is output.

FIG. 6 is a schematic diagram showing electrical connection of the current detection device main body 500. The current detection device main body 500 detects a current in the direction shown in the drawing, and outputs an electrical signal corresponding to the current to the output terminals 605a and 605b. The coil part 602 and the coil part 603 are arranged so that the polarities are opposite to each other.

As shown in FIG. 5 , the through holes of the magnetoelectric converter 550 in this embodiment are arranged obliquely with respect to the coil patterns. By arranging the through holes in this way, it is possible to configure the magnetoelectric conversion unit 550 having a coil width smaller than the total value of the diameters of the through holes. In the present embodiment, the through holes are arranged obliquely in a mountain shape that forms an angle of about 45 degrees with respect to each coil pattern. By arranging the through hole in this way, the coil is geometrically targeted. Therefore, a small magnetoelectric conversion unit 550 that can perform stable magnetic field detection can be supplied.

The coil part 602 and the coil part 603 are geometrically congruent. Due to manufacturing variations, the positional relationship between the magnetoelectric converter 550 and the primary conductor 510 may not be constant. In this case, only a part of the magnetic field generated in the primary conductor 510 is detected by the magnetoelectric conversion unit 550. Thus, even when the positional relationship between the magnetoelectric conversion portion 550 and the primary conductor 510 is not constant, the coil portion 602 and the coil portion 603 are geometrically congruent and have a primary conductor 510 shape.
Therefore, stable magnetic field detection can be performed.

In addition, the coil portion 602 and the coil portion 603 are reversely wound with each other, and are electrically connected in series, so that the influence of external magnetic field noise can be offset.

Further, the sum of the coil cross-sectional areas for the windings of the coil portion 602 and the coil portion 603 is equal, and stable magnetic field detection can be performed.

If this embodiment is used, the through holes for connecting the coil patterns provided on the front and back surfaces of the printed wiring board are arranged obliquely with respect to each coil pattern, so that they are relatively small and have a high output level. It is possible to provide a current detection device having a coil formed of a printed wiring board. Further, if this embodiment is used, the magnetoelectric conversion unit 55 is caused by manufacturing variation or the like.
Even when the positional relationship between 0 and the primary conductor 510 is not constant, the coil portion 602 and the coil portion 6
Since 03 has a geometrically congruent shape, coils having symmetrical shapes with respect to the central axis of the current of the primary conductor 510 are formed, and stable magnetic field detection can be performed.

In addition, if the present embodiment is used, the coil portion 602 and the coil portion 603 are reversely wound with each other and are electrically connected in series, so that the influence of magnetic field noise from the outside can be offset.

Further, if this embodiment is used, the sum of the coil cross-sectional areas for the windings of the coil portion 602 and the coil portion 603 is equal, and stable magnetic field detection can be performed.

As described above, by using the present invention, it is possible to provide a current detection device having a small coil with a high output level and having a coil conductor formed by a printed pattern.

[Example 4]
Per embodiment of a power meter using the current sensor according to the present invention will be described with reference to FIG. FIG. 7 is a block diagram showing a configuration example of the watt-hour meter.

701 is a current detector, current detection equipment 5 00 shown in Example 1 corresponds to this. The current detection unit 701 detects a use current (A1) used at a consumer's load, converts it into a low-level electrical signal corresponding to the use current, and outputs it.

A voltage detection unit 702 includes a voltage transformer, a voltage dividing resistor such as an attenuator, and the like, detects a use voltage (V1) used in a consumer load, and is a low level that is directly proportional to the use voltage. Converted into an electrical signal and output.

Reference numeral 703 denotes a power calculation unit, which is configured by a digital multiplication circuit, a DSP (digital signal processor), and the like. A signal related to the used current (A1) output from the current detection unit 701 and a voltage detection unit 702 are output. The signal related to the used voltage (V1) is multiplied and converted into data (A1 · V1) that is directly proportional to the power used by the consumer. Further, the power calculation unit 703 edits and outputs the calculation result of data (A1 · V1) that is directly proportional to the power used as the usage data. Here, the usage data refers to data related to the power used by the customer, such as the total accumulated power used by the customer's load and the time zone usage for each time zone. Further, since the signal related to the used current (A1) output from the current detection unit 701 is a signal that is directly proportional to the signal obtained by differentiating the used current (A1), data (A1 · V1) that is directly proportional to the consumed power of the consumer.
Is converted by the power calculation unit 703.

A display unit 704 includes a liquid crystal display and the like, and displays usage data.

By using this embodiment, it is possible to provide a watt-hour meter having a current detection device made up of a coil that is small and has a high output level and is formed of a printed wiring board.

500 Current detection device main body 510 Primary conductor 511, 512 Connection portion 550 Magnetoelectric conversion portion 551 Insulating sheet 513 First conductive portion 514 Second conductive portion 515 Third conductive portion 516 Fourth conductive portion 517 Fifth conductive portion 518 Sixth conductive portion 519 Bending part 520, 521 Protrusion part 601 Substrate 602, 603 Coil part 604 Connection pattern 605a, 605b Output terminal 606, 607 Polarity mark 701 Current detection part 702 Voltage detection part 703 Power calculation part 704 Display part

Claims (2)

To conduct current to be measured, the first conductive portion consisting of a substantially U-shaped plate-like metal conductor when viewed from the side, and, said first conductive portion and electrically connected to to the current to be measured the A loop-like structure comprising a second conductive part made of a substantially U-shaped plate-shaped metal conductor as viewed from the side, which is conducted in the opposite direction to the first conductive part, wherein the first conductive part A primary conductor that is a spring structure using elasticity by a material based on the bent portion of the second conductive portion and the bent portion of the second conductive portion;
A plurality of linear patterns printed wiring on at least two layers of the printed wiring layer printed wiring board of different printed wiring layer with, and, said the plurality of linear patterns are arranged obliquely, the different printed wiring layers A first coil portion and a second coil portion each having a plurality of through-holes for electrically conducting a plurality of linear patterns printed and wired on the first coil portion, outputting an electrical signal directly proportional to the magnetic field generated more first conductive portion and the second coil portion, the first coil portion I reverse wound der in the same number as that of said first coil portion electrically connected in series the second is of configured so that to output an electrical signal proportional to the magnetic field more generated in the conductive portion was magnetic-electric conversion unit,
An insulating sheet that electrically insulates the primary conductor and the magnetoelectric converter;
Equipped with,
The first coil part and the second coil part are geometrically congruent and form a shape that is symmetrical with respect to the central axis of the current flowing through the primary conductor, and each of the windings is disconnected at each turn The total area is equal,
In order to prevent misalignment of the primary conductor, the magnetoelectric conversion part, and the insulating sheet on the side where the magnetoelectric conversion part is disposed at the bent part of the first conductive part and the bent part of the second conductive part. With a convex protrusion of
A current detection device having a structure in which the magnetoelectric conversion unit and the insulating sheet are sandwiched and pressed inside the first conductive unit and the second conductive unit. A current detection unit comprising a current detection device according to claim 1 for detecting a current of a system under measurement;
A voltage detector for detecting the voltage of the system under measurement;
A power calculation unit for calculating data relating to electric energy from a signal related to the current of the measured system detected by the current detection unit and a signal related to the voltage of the measured system detected by the voltage detection unit; ,
A watt hour meter characterized by comprising:

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