JP2009128321A - Watt-hour meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a watt-hour meter having a current detection section which does not consume much labor in its manufacturing. <P>SOLUTION: The watt-hour meter is constituted of a current wire 206, having a coil section 301 that serves as the primary side of a current transformer, and a current sensor made of a secondary coil section, having coil patterns 402, 405 that serves as the secondary side of the current transformer supported by a flexible material, such as, a flexible printed circuit board. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a watt-hour meter that measures the power consumption of a system under measurement.

Conventionally, watt-hour meters that measure the amount of power used by ordinary households, factories, and offices have become widespread. The watt-hour meter displays a usage amount detecting means for measuring the used power amount of the system to be measured, a control portion for editing the usage amount detected by the usage amount detecting means into data, and data edited by the control portion. And a display unit. (For example, Patent Document 1)
Japanese Patent Laid-Open No. 62-12869 (page 4, FIG. 1)

A watt-hour meter that measures the amount of electricity used by a consumer is used for trading power charges, and it is necessary to accurately measure the amount of power. The amount of electric power is calculated by detecting and multiplying the AC voltage and AC current of the system under measurement, and then multiplying them. A conventional power meter uses a current transformer as a current detector for detecting the AC current. It was. As the current transformer, a toroidal core wound around is often used. The toroidal core has a donut shape with no joints and good magnetic properties, but on the other hand, since there are no joints, the windings that make up the transformer are difficult to be wound, making it difficult to manufacture. There was a problem. For this reason, it takes time to manufacture the current detector, and as a result, the entire watt-hour meter is expensive.

An object of this invention is to provide the watt-hour meter which has an electric current detection part which does not require an effort for manufacture.

In order to achieve the above object, a watt-hour meter according to the present invention is disposed on at least one of a plurality of current lines for conducting a current supplied from an external power supply side to a load side and the plurality of current lines. A first coil portion that converts a current flowing to the load side into a magnetic field that is directly proportional to the current, a flexible bendable sheet-like member, and engages with the first coil portion; A second coil unit that generates a current signal that is directly proportional to the magnetic field generated by the coil unit, voltage detection means that detects potentials of the plurality of current lines, a current signal generated by the second coil unit, and the Power calculation means for calculating the amount of power consumption by multiplying the voltage signal detected by the voltage detection means is provided.

ADVANTAGE OF THE INVENTION According to this invention, the watt-hour meter which has an electric current detection part which does not require an effort for manufacture can be provided.

  Examples of the present invention will be described below.

A first embodiment of a watt-hour meter according to the present invention will be described with reference to FIGS. These figures show a single-phase two-wire watt-hour meter.
Reference numeral 100 denotes a terminal unit, which constitutes a watt hour meter when combined with a later-described power amount measuring unit.

Reference numeral 150 denotes an electric energy measuring unit which incorporates a measurement circuit for measuring and displaying the electric energy used, and constitutes an electric energy meter when combined with the terminal unit 100. The electric energy measuring unit 150 is fixed to the fixing portions 101a and 101b of the terminal unit 100 with screws 152a and 152b via the fixing portions 151a and 151b. The electric energy measuring unit 150 has a structure that can be attached to and detached from the terminal unit 100.

  Next, the structure of the terminal unit 100 will be described based on FIG. 2A, and the structure of the electric energy measuring unit 150 will be described based on FIG.

First, the structure of the terminal unit 100 will be described.

  Reference numeral 201 denotes a terminal unit casing made of resin or the like, and holds each component.

  Reference numeral 202 denotes a 1-side power supply side terminal made of a conductive metal, to which a 1-side power supply-side conductor supplied from an external power supply side is connected.

  Reference numeral 203 denotes a 1-side load-side terminal made of a conductive metal, to which a 1-side load-side conductor supplied to a consumer's load side is connected.

Reference numeral 204 denotes a terminal on the second side power supply side made of a conductive metal, to which a second side power supply side conductor supplied from an external power supply side is connected.
Reference numeral 205 denotes a 2-side load-side terminal made of a conductive metal, to which a 2-side load-side conductor supplied to the load side of a consumer is connected.

Reference numeral 206 denotes a one-side current line, which is composed of one copper wire or the like, one end of which is connected to the one-side power-side terminal 202 and the other end is connected to the one-side load-side terminal 203 such as screws (not shown in the figure). ) To conduct current from the power supply side to the load side. The appearance of the one-side current line 206 is shown in FIG. 1 side current line 206
Has a coil part 301 in the middle. The coil part 301 further has a groove part 302 and engages with a secondary coil part 207 described later. The 1-side current line 206 is covered with the terminal unit casing 201 of the terminal unit 100 and cannot be directly seen from the outside. In addition, the 1 side current line in FIG. 3 is good also as a structure which engages the coil part 301 comprised with the metal material, and the groove part 302 comprised with the resin material.

Reference numeral 207 denotes a secondary coil portion, which is composed of a wire formed in a coil shape attached to a flexible plastic plate, a flexible printed circuit board having a coil pattern, and the like. A magnetic field directly proportional to the current flowing through the one-side current line 206 converted in 301 is detected, converted into a low-level current signal, and output to the terminal portions 208 and 209. The secondary coil portion 207 is engaged with the groove portion 302 of the coil portion 301 of the one-side current line 206, and the current flowing from the one-side power supply side terminal 202 to the one-side load side terminal 203 is, for example, 1 mA to 100 mA. Is converted to a low-level current that is directly proportional to

  Reference numerals 208 and 209 are terminal portions made of a conductive metal such as copper, and are electrically connected to both ends of the coil of the secondary coil portion 207 and converted by the secondary coil portion 207. A low-level current that is directly proportional to the current flowing from the 1-side power-side terminal 202 to the 1-side load-side terminal 203 is output via 206.

Reference numeral 210 denotes a two-side current line, which is composed of one copper wire or the like, one end of which is connected to a terminal on the second-side power supply side 204 and the other end is connected to a terminal on the two-side load side 205 (not shown). ) To conduct current from the power supply side to the load side.
Reference numerals 211 and 212 denote terminal portions made of a conductive metal such as copper, which are electrically connected to the 1 side current line 206 and the 2 side current line 210, respectively, and are connected to the 1 side power supply side terminal 202 and 2 side power supply. The potential appearing at the side terminal 204 is output.

  Next, the structure of the electric energy measuring unit 150 will be described.

Reference numeral 251 denotes an electric energy measuring unit housing made of a resin such as polycarbonate that can withstand wind and rain, and covers each component such as an internal electronic component.
Reference numeral 252 denotes a printed circuit board that holds electronic components and other components.

  Terminal portions 253 and 254 are made of a conductive metal such as copper, and are electrically connected to terminals 208 and 209 in the terminal unit 100 and output from the secondary coil portion 207. A low level current that is directly proportional to the current flowing through 206 is detected.

  255 and 256 are terminal portions made of a conductive metal such as copper, and are electrically connected to the terminal portions 211 and 212 in the terminal unit 100, and are respectively connected to the 1 side current line 206 and the 2 side current line 210. The potential that appears is detected.

Reference numeral 257 denotes a power calculation unit which is configured by a so-called A-D converter, a semiconductor component such as a microcomputer, and the like, and the 1 side power supply side terminal 20 detected by the terminal units 253 and 254.
A low-level current that is directly proportional to the current flowing from the load terminal 2 to the load side 1 on the 2 side and the terminal portion 25
5 and 256, the power consumption of the system to be measured is calculated and displayed from the potentials output from the terminal unit 211 and the terminal unit 212, which are detected at 5 and 256.

Next, the operation of this embodiment will be described.

The secondary coil portion 207 has a sheet-like shape as shown in FIG. 4 before being attached to the coil portion 301 of the one-side current line 206. The secondary coil portion 207 is configured by a coil-shaped wire attached to a flexible plastic plate, a flexible printed circuit board having a coil pattern, and the like. It is attached to the part 301.

As an example, a specific configuration example of the secondary coil unit 207 will be described. 401 is, for example, a single-sided pattern flexible printed circuit board. A first coil pattern 402 is provided so as to surround the first hole 404 having the first notch 403. Reference numeral 405 denotes a second coil pattern which is provided so as to surround the second hole 407 having the second notch 406. The first coil pattern 402 and the second coil pattern 405 are electrically connected by patterns 408 and 409. The first coil pattern 402 and the second coil pattern 405 are thereby electrically connected, and both electrical ends are connected to the terminal portions 208 and 209 described above. Reference numeral 410 denotes a hollow portion, which is a hole provided in the central portion of the flexible printed circuit board 401.

The secondary coil unit 207 is attached to the coil unit 301 of the one-side current line 206 and integrally converts the current flowing from the one-side power supply side terminal 202 to the one-side load side terminal 203 into a low level current. Configure the transformer.

The secondary coil unit 207 is attached to the coil unit 301 of the first-side current line 206 in the following procedure. First, the first notch portion 403 of the secondary coil portion 207 is opened and passed through the coil portion 301 of the one-side current line 206, and the first hole 404 is a groove portion of the coil portion 301 of the one-side current line 206. It is attached so as to surround 302. Next, the bent portions 411 and 412 of the secondary coil portion 207 are bent into valley folds, and the hollow portion 410 is passed through the coil portion 301 of the one-side current line 206. Next, the bent portions 413 and 414 of the secondary coil portion 207 are bent into mountain folds, the second notch portion 406 of the secondary coil portion 207 is opened, passed through the coil portion 301 of the first current line 206, The second hole portion 407 is attached so as to surround the groove portion 302 of the coil portion 301 of the one-side current line 206. As a result, the secondary coil portion 207 is attached to the coil portion 301 of the first-side current line 206 as shown in the side view of FIG.

  The terminal portions 208 and 209 are arranged on the surface of the terminal unit housing 201 of the terminal unit 100.

  The terminal unit 100 and the electric energy measuring unit 150 are attached as follows to constitute an electric energy meter.

The terminal portions 208 and 209 of the terminal unit 100 are electrically connected to both ends of the coil of the secondary coil portion 207, and are converted by the secondary coil portion 207 through the 1-side current line 206. A low-level current that is directly proportional to the current flowing from 202 to the one-side load-side terminal 203 is output. The terminal portions 208 and 209 are disposed on the surface of the terminal unit housing 201 of the terminal unit 100.

The terminal units 253 and 254 of the electric energy measuring unit 150 are electrically connected to the terminal units 208 and 209 in the terminal unit 100, and the low level current output from the secondary coil unit 207 is input thereto.

  The terminal portions 211 and 212 of the terminal unit 100 output a potential appearing at the first power supply side terminal 202 and the second power supply side terminal 204. The terminal portions 211 and 212 are disposed on the surface of the terminal unit housing 201 of the terminal unit 100.

  The terminal portions 255 and 256 of the electric energy measuring unit 150 are electrically connected to the terminal portions 211 and 212 in the terminal unit 100, and potentials appearing on the first current line 206 and the second current line 210 are input.

The power calculation unit 257 is configured by a so-called AD converter, a semiconductor component such as a microcomputer, and the like, and the one-side power supply side terminal 20 detected by the terminal units 253 and 254.
A low-level current that is directly proportional to the current flowing from the load terminal 2 to the load side 1 on the 2 side and the terminal portion 25
5 and 256, a voltage is obtained from the potentials output from the terminal unit 211 and the terminal unit 212, and the electric power used by the system under measurement is calculated and displayed by multiplying and integrating the current and voltage.

Next, how to attach and detach the terminal unit 100 and the electric energy measuring unit 150 in the actual use state will be described.

  The terminal unit 100 is attached to the wall surface of a customer's house, etc., and the power supply line from the power supply company is connected to the 1 side power supply side terminal 202 and the 2 side power supply side terminal 204, and the 1 side load side terminal. A power supply line for supplying power to an indoor load is connected to the 203-side load side terminal 205. When the usable period of the watt-hour meter expires or when the power supply company changes, the power measurement unit 150 is replaced while the terminal unit 100 remains on the wall surface of the house. The replacement is performed by attaching / detaching the electric energy measuring unit 150 to / from the terminal unit 100.

  The electric energy measuring unit 150 is attached in the following procedure.

First, the electric energy measuring unit 150 is superimposed on the terminal unit 100 attached to the wall surface of the house. Next, screws 152 a and 152 b are screwed into the fixing portions 101 a and 101 b of the terminal unit 100 via the fixing portions 151 a and 151 b of the electric energy measuring unit 150. The screws 152a and 152b are screws with wires called sealing screws, and the wires (not shown) are fixed to the wire fixing portions 102a and 102b. The electric energy measuring unit 150 is fixed to the terminal unit 100 by the procedure as described above.

When the electric energy measuring unit 150 is fixed to the terminal unit 100, the terminal portions 253 and 254 of the electric energy measuring unit 150 are electrically connected to the terminals 208 and 209 in the terminal unit 100 and are connected by the secondary coil portion 207. The output low level current directly proportional to the current flowing through the one-side current line 206 is transmitted to the power calculation unit 257.

  Terminal portions 255 and 256 are electrically connected to terminal portions 211 and 212 in terminal unit 100, and potentials appearing on first-side current line 206 and second-side current line 210 are transmitted to power calculation unit 257.

It is directly proportional to the voltage between the first power supply terminal 202 and the second power supply terminal 204 detected at the terminal portions 255 and 256, and the current flowing through the first current line 206 detected at the terminal portions 253 and 254. The current is multiplied by the power calculation unit 257 and is calculated and displayed as the power consumption of the system under measurement.

Next, the case where the electric energy measuring unit 150 is removed will be described. The watt-hour meter is used for electricity bill transactions, and is allowed to be used only for a fixed period according to the measurement law. When the period expires, it must be replaced. It is also necessary to replace the watt hour meter if it fails. Removal of the electric energy measuring unit 150 is performed according to the following procedure.

First, the wire (not shown) of the sealing screw is removed from the wire fixing portions 102a and 102b, and the screws 152a and 152b fixing the electric energy measuring unit 150 to the terminal unit 100 are removed. Next, the electric energy measuring unit 150 is removed from the terminal unit 100. The terminal portions 255 and 256 of the power amount measuring unit 150 are only in contact with the terminal portions 211 and 212 of the terminal unit 100, and the terminal portions 253 and 254 of the power amount measuring unit 150 are the terminal portions of the terminal unit 100. Since it is only in contact with 208 and 209, the power measurement unit 150 can be removed from the terminal unit 100 by removing the two screws 152 a and 152 b.
The watt-hour meter replacement work is performed at the end of the usable period determined by the verification system, and the watt-hour meter replacement frequency is as long as 10 years. Conventionally, consumers who use electric power can only purchase electric power from one electric power company, and it has not been considered that the electric power company that the customer purchases is changed in the middle of the usable period. Therefore, in principle, there was no need to replace the watt-hour meter in the middle of the usable period. However, the liberalization of electric power has been promoted, and it has become possible for new electric power supply companies other than certain electric power companies to sell electric power. Consumers can freely choose a power supply company. Since the ownership of the watt-hour meter installed at the consumer is often owned by the power supply company, there is a possibility that the watt-hour meter will be replaced whenever the consumer changes the power supply company. Since consumers demand advantageous power charges and services, it is possible that the change of the power supply company is frequently made. In addition, since each power supply company supplies its customers with its own price menus and services, the function of the electricity meter installed in the customer varies depending on each power supply company, making it difficult to share the electricity meter It is. In the conventional watt-hour meter, when replacing, a large number of screw attaching / detaching operations of the terminal block portion are necessary, and there is a problem that the operation is complicated to frequently replace the watt-hour meter. If this embodiment is used, the power amount measuring unit 150 can be replaced with a small number of screws.
In addition, since only the watt-hour measuring unit 150 can be replaced if this embodiment is used, the conductors are not idle as in the case of replacement of the conventional watt-hour meter, the work is easy to perform, and the conductors are short-circuited. The replacement work can be performed safely.
As described above, since the current transformer using the toroidal core, which takes time and effort to wind the winding, is not used if the present embodiment is used. The cost of the entire meter can be reduced.

As described above, by using the present invention, it is possible to provide a watt-hour meter having a current detection unit that does not require time and effort for manufacturing.

Second Embodiment A watt-hour meter according to the present invention will be described with reference to FIGS. FIG. 5 shows a single-phase two-wire watt-hour meter.
In FIG. 5, the difference from the first embodiment is that the terminal unit 100 has the secondary coil portion 207 in the first embodiment, but the second embodiment has the secondary coil portion 501 in the terminal unit 100. It is a point.

In FIG. 5, reference numeral 501 denotes a secondary coil portion, which is configured by a wire formed in a coil shape attached to a flexible plastic plate, a flexible printed circuit board having a coil pattern, and the like. A magnetic field directly proportional to the current flowing through the one-side current line 206 converted by the coil unit 301 is detected, converted into a low-level current signal, and output to the terminal units 502 and 503. The secondary coil portion 501 is engaged with the groove portion 302 of the coil portion 301 of the one-side current line 206, and the current flowing from the one-side power supply side terminal 202 to the one-side load side terminal 203 is, for example, 1 mA to 100 mA. Is converted into a low level current that is directly proportional to

  Reference numerals 502 and 503 are terminal portions made of a conductive metal such as copper, electrically connected to both ends of the coil of the secondary coil portion 501, and converted by the secondary coil portion 501. A low-level current that is directly proportional to the current flowing from the 1-side power-side terminal 202 to the 1-side load-side terminal 203 is output via 206.

  FIG. 6 shows the structure of the secondary coil unit 501. Reference numeral 601 denotes a single-sided pattern flexible printed circuit board, for example. Reference numeral 602 denotes a first coil pattern, which is provided so as to surround the first hole 604 having the first notch 603. Reference numeral 605 denotes a second coil pattern which is provided so as to surround the second hole portion 607 having the second notch portion 606.

The first coil pattern 602 and the second coil pattern 605 are electrically connected by patterns 608 and 609. Thus, the first coil pattern 602 and the second coil pattern 605 are electrically connected, and both electrical ends are connected to the terminal portions 502 and 503 described above.

The secondary coil unit 501 is attached to the coil unit 301 of the one-side current line 206 and integrated with it to convert the current flowing from the one-side power supply side terminal 202 to the one-side load side terminal 203 into a low level current. Configure the transformer.

The secondary coil unit 501 is attached to the coil unit 301 of the first current line 206 in the following procedure. First, the first notch portion 603 of the secondary coil portion 501 is opened, the coil portion 301 of the one-side current line 206 is passed, and the first hole portion 604 is the groove portion of the coil portion 301 of the one-side current line 206. It is attached so as to surround 302. Next, the bent portion 610 of the secondary coil portion 501 is bent into a valley fold, the second notch portion 606 of the secondary coil portion 501 is opened, and the coil portion 301 of the first-side current line 206 is passed, The hole portion 607 is attached so as to surround the groove portion 302 of the coil portion 301 of the one-side current line 206. As a result, the secondary coil portion 501 is attached to the coil portion 301 of the first-side current line 206 as shown in the side view of FIG.

  The terminal portions 502 and 503 are disposed on the surface of the terminal unit housing 201 of the terminal unit 100.

  The terminal unit 100 and the electric energy measuring unit 150 are attached as follows to constitute an electric energy meter.

Terminal portions 502 and 503 of the terminal unit 100 are electrically connected to both ends of the coil of the secondary coil portion 501, and are connected to the first power supply side terminal via the one-side current line 206 converted by the secondary coil portion 501. A low-level current that is directly proportional to the current flowing from 202 to the one-side load-side terminal 203 is output. The terminal portions 502 and 503 are disposed on the surface of the terminal unit housing 201 of the terminal unit 100.

The terminal portions 253 and 254 of the electric energy measuring unit 150 are electrically connected to the terminal portions 502 and 503 in the terminal unit 100, and the low level current output from the secondary coil portion 501 is input.

  The terminal portions 211 and 212 of the terminal unit 100 are electrically connected to the 1 side current line 206 and the 2 side current line 210, and the potential appearing at the 1 side power supply side terminal 202 and the 2 side power supply side terminal 204 is output. Yes. The terminal portions 211 and 212 are disposed on the surface of the terminal unit housing 201 of the terminal unit 100.

  The terminal portions 255 and 256 of the electric energy measuring unit 150 are electrically connected to the terminal portions 211 and 212 in the terminal unit 100, and potentials appearing on the first current line 206 and the second current line 210 are input.

The power calculation unit 257 is configured by a so-called AD converter, a semiconductor component such as a microcomputer, and the like, and the one-side power supply side terminal 20 detected by the terminal units 253 and 254.
A low-level current that is directly proportional to the current flowing from the terminal 2 for the load side 1 to the side 2 and the terminal portion 25
5 and 256, a voltage is obtained from the potentials output from the terminal unit 211 and the terminal unit 212, and the electric power used by the system under measurement is calculated and displayed by multiplying and integrating the current and voltage.

  As described above, since the current transformer using the toroidal core, which takes time and effort to wind the winding, is not used if the present embodiment is used. The cost of the entire meter can be reduced.

As described above, by using the present invention, it is possible to provide a watt-hour meter having a current detection unit that does not require time and effort for manufacturing.

  Embodiment 3 of the watt-hour meter according to the present invention will be described with reference to FIG.

  Example 3 differs from Example 1 and Example 2 in that Example 1 and Example 2 had two coil patterns in the secondary coil part, but Example 3 had four coil patterns. It is a point. In addition, the structure of the terminal unit 100 and the electric energy measurement unit 150 is the same as that of Example 1 shown in FIG.

In FIG. 7, reference numeral 701 denotes a secondary coil portion, which is configured by a wire formed in a coil shape attached to a flexible plastic plate, a flexible printed board having a coil pattern, and the like. A magnetic field directly proportional to the current flowing through the one-side current line 206 converted by the coil unit 301 is detected, converted into a low-level current signal, and output to the terminal units 702 and 703. The secondary coil portion 701 is engaged with the groove portion 302 of the coil portion 301 of the one-side current line 206, and the current flowing from the one-side power supply side terminal 202 to the one-side load side terminal 203 is, for example, 1 mA to 100 mA. Is converted into a low level current that is directly proportional to

  Reference numerals 702 and 703 are terminal portions made of a conductive metal such as copper, and are electrically connected to both ends of the coil of the secondary coil portion 701 and converted by the secondary coil portion 701. A low-level current that is directly proportional to the current flowing from the 1-side power-side terminal 202 to the 1-side load-side terminal 203 is output via 206.

  Reference numeral 704 denotes, for example, a single-sided pattern flexible printed circuit board.

Reference numeral 705 denotes a first coil pattern, which is provided so as to surround the first hole 707 having the first notch 706.

Reference numeral 708 denotes a second coil pattern, which is provided so as to surround the second hole 710 having the second notch 709.

Reference numeral 711 denotes a third coil pattern which is provided so as to surround the second hole portion 713 having the third notch portion 712.

Reference numeral 714 denotes a fourth coil pattern, which is provided so as to surround the second hole 716 having the fourth notch 715.

The first coil pattern 705, the second coil pattern 708, the third coil pattern 711, and the fourth coil pattern 714 are electrically connected by patterns 717, 718, 719, and 720, respectively. Each coil pattern is thereby electrically connected, and both electrical ends are connected to the terminal portions 702 and 703 described above.

Reference numeral 721 denotes a hollow portion provided at the center of the secondary coil portion 701.

The secondary coil unit 701 is attached to the coil unit 301 of the one-side current line 206 and integrated with it to convert the current flowing from the one-side power supply side terminal 202 to the one-side load side terminal 203 into a low level current. Configure the transformer.

The secondary coil unit 701 is attached to the coil unit 301 of the first-side current line 206 in the following procedure.

First, the first notch portion 706 of the secondary coil portion 501 is opened, the coil portion 301 of the one-side current line 206 is passed, and the first hole portion 707 is the groove portion of the coil portion 301 of the one-side current line 206. It is attached so as to surround 302.

Next, the bent portion 722 of the secondary coil portion 501 is folded into a valley fold, the bent portion 723 is folded into a mountain fold, the second notch portion 709 of the secondary coil portion 701 is opened, and the coil portion of the first current line 206 301 is passed, and the second hole portion 710 is attached so as to surround the groove portion 302 of the coil portion 301 of the first-side current line 206. As a result, the secondary coil portion 501 is attached to the coil portion 301 of the first-side current line 206 as shown in the side view of FIG.

Next, the bent portion 724 of the secondary coil portion 501 is bent into a valley fold, the bent portion 725 is bent into a mountain fold, the third notch portion 712 of the secondary coil portion 701 is opened, and the coil portion of the one-side current line 206 301 is passed, and the third hole 713 is attached so as to surround the groove portion 302 of the coil portion 301 of the one-side current line 206.

Next, the bent portion 726 and the bent portion 727 of the secondary coil portion 501 are bent into a valley fold, the bent portion 728 and the bent portion 729 are bent into a mountain fold, and the fourth notch portion 715 of the secondary coil portion 701 is opened. The coil portion 301 of the first current line 206 is passed through, and the fourth hole portion 716 is attached so as to surround the groove portion 302 of the coil portion 301 of the first side current line 206.

As a result, the secondary coil unit 701 is attached to the coil unit 301 of the first current line 206.

  The terminal portions 702 and 703 are disposed on the surface of the terminal unit housing 201 of the terminal unit 100.

  The terminal unit 100 and the electric energy measuring unit 150 are attached as follows to constitute an electric energy meter.

Terminal portions 702 and 703 of the terminal unit 100 are electrically connected to both ends of the coil of the secondary coil portion 701, and are connected to the first power supply side terminal via the one-side current line 206 converted by the secondary coil portion 701. A low-level current that is directly proportional to the current flowing from 202 to the one-side load-side terminal 203 is output. The terminal portions 702 and 703 are disposed on the surface of the terminal unit housing 201 of the terminal unit 100.

The terminal portions 253 and 254 of the electric energy measuring unit 150 are electrically connected to the terminal portions 702 and 703 in the terminal unit 100, and the low level current output from the secondary coil portion 701 is input thereto.

  The terminal portions 211 and 212 of the terminal unit 100 are electrically connected to the 1 side current line 206 and the 2 side current line 210, and the potential appearing at the 1 side power supply side terminal 202 and the 2 side power supply side terminal 204 is output. Has been. The terminal portions 211 and 212 are disposed on the surface of the terminal unit housing 201 of the terminal unit 100.

  The terminal portions 255 and 256 of the electric energy measuring unit 150 are electrically connected to the terminal portions 211 and 212 in the terminal unit 100, and potentials appearing on the first current line 206 and the second current line 210 are input.

The power calculation unit 257 is configured by a so-called AD converter, a semiconductor component such as a microcomputer, and the like, and the one-side power supply side terminal 20 detected by the terminal units 253 and 254.
A low-level current that is directly proportional to the current flowing from the load terminal 2 to the load side 1 on the 2 side and the terminal portion 25
5 and 256, a voltage is obtained from the potentials output from the terminal unit 211 and the terminal unit 212, and the electric power used by the system under measurement is calculated and displayed by multiplying and integrating the current and voltage.

  As described above, since the current transformer using the toroidal core, which takes time and effort to wind the winding, is not used if the present embodiment is used. The cost of the entire meter can be reduced.

As described above, by using the present invention, it is possible to provide a watt-hour meter having a current detection unit that does not require time and effort for manufacturing.

The block diagram which shows the structure of Example 1 of the watt-hour meter by this invention The internal structure figure which shows the internal structure of Example 1 of the watt-hour meter by this invention FIG. 1 is a structural diagram showing the structure of a one-side current line of a watt-hour meter according to the present invention. Structure diagram showing the structure of the secondary coil portion of the first embodiment of the watt-hour meter according to the present invention The internal structure figure which shows the internal structure of Example 2 of the watt-hour meter by this invention Structure diagram showing the structure of the secondary coil portion of the second embodiment of the watt-hour meter according to the present invention Structure diagram showing the structure of the secondary coil portion of the third embodiment of the watt-hour meter according to the present invention

Explanation of symbols

100 Terminal unit 101a, 101b Fixing part 102a, 102b Wire fixing part 150 Electric energy measuring unit 151a, 151b Fixing part 152a, 152b Screw 201 Terminal unit housing 202 1 side power supply side terminal 203 1 side load side terminal 204 2 side Power supply side terminal 205 2 side load side terminal 206 1 side current line 207 Secondary coil part 208, 209 terminal part 210 2 side current line 211, 212 terminal part 251 Power measurement unit housing 252 Printed circuit board 253, 254 terminal Portion portion 255, 256 Terminal portion 257 Power calculation portion 301 Coil portion 302 Groove portion 401 Flexible printed circuit board 402 Coil pattern 403 Notch portion 404 Hole portion 405 Coil pattern 406 Notch portion 407 Hole portion 408, 409 Pattern 410 Hollow portion 411, 412 413, 4 4 Bending part 501 Secondary coil part 502, 503 Terminal part 601 Flexible printed circuit board 602 Coil pattern 603 Notch part 604 Hole part 605 Coil pattern 606 Notch part 607 Hole part 608, 609 Pattern 610 Bending part 701 Secondary coil part 702 703 Terminal part 704 Flexible printed circuit board 705 Coil pattern 706 Notch part 707 Hole part 708 Coil pattern 709 Notch part 710 Hole part 711 Coil pattern 712 Notch part 713 Hole part 714 Coil pattern 715 Notch part 716 Hole part 717, 718, 719, 720 Pattern 721 Hollow part 722, 723, 724, 725, 726, 727, 728, 729 Bending part

Claims (6)

A plurality of current lines for conducting the current supplied from the external power supply side to the load side;
A first coil unit disposed on at least one of the plurality of current lines and converting a current flowing to the load side into a magnetic field directly proportional to the current;
A second coil portion provided on a bendable sheet-like member, engaged with the first coil portion, and generating a current signal directly proportional to the magnetic field generated by the first coil portion;
Voltage detecting means for detecting voltage signals of the plurality of current lines;
A watt-hour meter comprising: a power calculation unit that calculates a power consumption amount by multiplying a current signal generated by the second coil unit by a voltage signal detected by the voltage detection unit. A plurality of current lines for conducting the current supplied from the external power supply side to the load side;
A first coil unit disposed on at least one of the plurality of current lines and converting a current flowing to the load side into a magnetic field directly proportional to the current;
A terminal provided on a bendable sheet-like member, engaged with the first coil portion, and a second coil portion that generates a current signal directly proportional to the magnetic field generated by the first coil portion; And
Voltage detecting means for detecting voltage signals of the plurality of current lines of the terminal portion;
A power amount measuring unit including a power calculation unit that calculates a power consumption amount by multiplying the current signal generated by the second coil unit by the voltage signal detected by the voltage detection unit; Watt hour meter. The second coil part is
A plurality of coil patterns;
3. The plurality of coil patterns are overlapped by folding the flexible foldable sheet-like member and engaged with the first coil portion. The watt hour meter described. The second coil part is
Ω-shaped coil pattern,
A hole provided in the center of the coil pattern;
Extending from the hole, provided with a notch provided in the opening of the Ω-shaped coil pattern,
The said 2nd coil part passes through the said 1st coil part from the said notch part, and is engaged with the said 1st coil part in the said hole part, The 1st thru | or 3 characterized by the above-mentioned. The electricity meter according to any one of the above. The first coil portion is
Ω-shaped coil pattern,
A groove portion provided on the outer periphery of the Ω-shaped coil pattern,
The watt-hour meter according to claim 1, wherein the second coil portion is engaged with a groove portion of the first coil portion. The watt-hour meter according to any one of claims 1 to 5, wherein the second coil portion is formed by a pattern on a flexible printed circuit board.

Images