JPH05223849A - Current sensor - Google Patents

Abstract

PURPOSE:To generate electric signals proportioning to the amperage as object for sensing by allowing a current to be sensed to flow in a loop-form current path formed on a conductor, generating a magnetic flux, and converting the magnetic flux into electric signals. CONSTITUTION:A one-turn loop formed current path 1b is formed with a plurality of notches 1a within the same plane of a plate-form conductor 1. A magnetic- electric transducer 2 is provided as the center part of this current path 1b. The current path in loop form may be formed through folding of a conductor. When a current to be measured I flows in this current path 1b on the conductor 1, a magnetic flux F penetrating the center of the loop-form current path 1b is generated. The magnetic flux generated F is converted into electric signals by the magnetic-electric transducer 2, and electric signals proportioning to the amperage as object for sensing are obtained, and thus the current I is sensed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field requiring conversion of a current into an electric signal for a required calculation, for example, a current detector used in an electronic watt-hour meter for measuring power consumption. Regarding

[0002]

2. Description of the Related Art As a conventional current detector, for example, FIG.
There is a current sensor (hereinafter referred to as CT) as shown in FIG.
In CT, the linear primary conductor 12 is a ring-shaped ferromagnetic material 1
The secondary winding 13 is wound around the ferromagnetic material 14 so as to pass through the central portion of the magnetic recording medium 4. Then, when the primary current i which is the test current flows through the primary conductor 12, a magnetic flux f is generated, and the magnetic flux f causes a current proportional to the primary current i to flow through the secondary winding 13 to detect the primary current i. It is like this.

[0003]

In the conventional CT, the linear primary winding is penetrated by the ring-shaped ferromagnetic material around which the secondary winding is wound, so that the structure is complicated and fixed. It was difficult to do so, and from these points the cost was high.

Therefore, an object of the present invention is to provide a current detector having a simple structure, an easy fixing method, and cost reduction.

[0005]

In order to solve the above-mentioned problems, the present invention forms a loop-shaped current path by cutting or bending in the same plane, and a conductor through which a test current flows, and a conductor flowing through the conductor. The gist of the present invention is to have a magnetoelectric conversion unit that converts the magnetic flux generated by the detection current into an electric signal.

[0006]

With the above structure, magnetic flux is generated by the flow of the test current through the loop-shaped current path formed in the conductor.
The magnetic flux is converted into an electric signal by the magnetoelectric conversion unit, and an electric signal proportional to the test current value is obtained.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a first embodiment of the present invention.

First, the structure of the current detector will be described. In the figure, 1 is a plate-shaped conductor, and a plurality of cuts 1a in the same plane form a loop-shaped current path 1b consisting of one turn. There is. A magnetoelectric conversion element 2 as a magnetoelectric conversion unit is arranged at the center of the loop current path 1b.

The loop-shaped current path may be formed by bending the conductor as appropriate.

Next, the operation of the current detector constructed as described above will be described.

When the test current I flows through the current path 1b of the conductor 1, the magnetic flux F penetrating the central portion of the loop-shaped conductor path 1b.
Occurs. This magnetic flux F is converted into an electric signal by the magnetoelectric conversion element 2, and an electric signal proportional to the test current value is obtained to detect the test current I.

The current detector of the present embodiment has a simple structure, and the fixing method is only to fix the portion of the conductor 1, so that the cost can be reduced.

FIG. 2 shows a second embodiment of the present invention.

In FIG. 2, members which are the same as or equivalent to the members, parts, elements and the like in FIG. 1 are designated by the same reference numerals as those used above, and a duplicated description will be omitted.

In this embodiment, the ferromagnetic material 3 for collecting the magnetic flux F is arranged at the central portion of the loop-shaped conductor path 1b through which the generated magnetic flux F penetrates.

According to the present embodiment, since the magnetic flux F generated by the test current I is efficiently collected by the ferromagnetic material 3 and converted into an electric signal by the magnetoelectric conversion element 2, the test current I is further increased. An improvement in detection sensitivity can be obtained.

Next, FIG. 3 shows a first application example in which the embodiment of the present invention is applied to an electronic watt hour meter.

In the figure, 4 is an auxiliary transformer, 5 is a voltage / current converter, 10 is the current detector of this embodiment described above, and the current / flux converter 11 and the magnetoelectric conversion element 2 in the conductor 1 part. And a magnetoelectric conversion unit 12 configured by. Reference numeral 7 is a voltage / frequency converter, and 8 is a display.

A current signal proportional to the load voltage of the distribution line is obtained by the auxiliary transformer 4, and this voltage signal is converted into a current signal proportional to the load voltage by the voltage / current converter 5. This current signal is sent to the current / magnetic flux converter 11 in the current detector 10 and converted into magnetic flux. On the other hand, the load current of the distribution line is directly sent to the current / magnetic flux converter 11 and converted into magnetic flux. As a result, the magnetic fluxes proportional to the load voltage and the load current are converted into electric signals by the magnetoelectric conversion unit 12, and the electric signals proportional to the electric energy are obtained from the magnetoelectric conversion unit 12. Next, this electric signal is converted into a pulse signal by the voltage / frequency converter 7, and the amount of electric power is displayed on the display 8 by this pulse signal.

FIG. 4 shows a second application example in which the embodiment of the present invention is applied to an electronic watt hour meter.

In this application example, a multiplier 6 is provided instead of the voltage / current converter 5 in the first application example.

Then, an electric signal proportional to the load voltage of the distribution line obtained by the auxiliary transformer 4 is sent to the multiplier 6. On the other hand, the load current of the distribution line is sent to the current / magnetic flux converter 11 in the current detector 10 to be converted into a magnetic flux, and then converted into an electric signal proportional to the load current in the magnetoelectric converter 12 to be multiplied by the multiplier. Sent to 6. The multiplier 6 multiplies the electric signal proportional to the load voltage by the electric signal proportional to the load current, and an electric signal proportional to the electric energy is obtained from the multiplier 6. After that, through the voltage / frequency converter 7,
The amount of power is displayed on the display 8.

[0024]

As described above, according to the present invention,
A structure having a conductor that forms a loop-shaped current path by cutting or bending in the same plane to flow a test current, and a magnetoelectric conversion unit that converts the magnetic flux generated by the test current flowing in this conductor into an electric signal Therefore, the structure is simple, and the fixing method is easy because the conductor portion may be fixed, and the cost can be reduced from these points.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of a current detector according to the present invention.

FIG. 2 is a diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a block diagram showing a first application example in which the embodiment of the present invention is applied to an electronic watt hour meter.

FIG. 4 is a block diagram showing a second application example in which the embodiment of the present invention is applied to an electronic watt hour meter.

FIG. 5 is a perspective view showing a conventional current sensor.

[Explanation of symbols]

 1 Conductor 1a Cut 1b Current path 2 Magnetoelectric conversion element (magnetoelectric conversion part)

Claims (1)

[Claims] 1. A conductor for forming a loop-shaped current path by cutting or bending in the same plane to flow a test current, and a magnetoelectric conversion unit for converting a magnetic flux generated by the test current flowing through the conductor into an electric signal. And a current detector.